Import of Linux/MIPS 2.1.14.2

25 files changed, 2324 insertions, 0 deletions

diff --git a/arch/mips/sgi/kernel/.cvsignore b/arch/mips/sgi/kernel/.cvsignore
new file mode 100644
index 000000000..4671378ae
--- /dev/null
+++ b/arch/mips/sgi/kernel/.cvsignore
@@ -0,0 +1 @@
+.depend
diff --git a/arch/mips/sgi/kernel/Makefile b/arch/mips/sgi/kernel/Makefile
new file mode 100644
index 000000000..c79023b23
--- /dev/null
+++ b/arch/mips/sgi/kernel/Makefile
@@ -0,0 +1,30 @@
+# $Id: Makefile,v 1.5 1996/06/08 12:08:38 dm Exp $
+# Makefile for the SGI specific kernel interface routines
+# under Linux.
+#
+# Note! Dependencies are done automagically by 'make dep', which also
+# removes any old dependencies. DON'T put your own dependencies here
+# unless it's something special (ie not a .c file).
+#
+# Note 2! The CFLAGS definitions are now in the main makefile...
+
+.S.s:
+	$(CPP) $(CFLAGS) $< -o $*.s
+.S.o:
+	$(CC) $(CFLAGS) -c $< -o $*.o
+
+OBJS  = indy_mc.o indy_hpc.o indy_int.o system.o indy_timer.o indyIRQ.o \
+	reset.o setup.o time.o
+
+all: sgikern.a
+
+sgikern.a: $(OBJS)
+	$(AR) rcs sgikern.a $(OBJS)
+	sync
+
+indyIRQ.o: indyIRQ.S
+
+dep:
+	$(CPP) -M *.c > .depend
+
+include $(TOPDIR)/Rules.make
diff --git a/arch/mips/sgi/kernel/indyIRQ.S b/arch/mips/sgi/kernel/indyIRQ.S
new file mode 100644
index 000000000..a7058d3ee
--- /dev/null
+++ b/arch/mips/sgi/kernel/indyIRQ.S
@@ -0,0 +1,138 @@
+/* $Id: indyIRQ.S,v 1.5 1996/06/29 12:41:12 dm Exp $
+ * indyIRQ.S: Interrupt exception dispatch code for FullHouse and
+ *            Guiness.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <asm/asm.h>
+#include <asm/mipsconfig.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+
+	/* A lot of complication here is taken away because:
+	 *
+	 * 1) We handle one interrupt and return, sitting in a loop
+	 *    and moving across all the pending IRQ bits in the cause
+	 *    register is _NOT_ the answer, the common case is one
+	 *    pending IRQ so optimize in that direction.
+	 *
+	 * 2) We need not check against bits in the status register
+	 *    IRQ mask, that would make this routine slow as hell.
+	 *
+	 * 3) Linux only thinks in terms of all IRQs on or all IRQs
+	 *    off, nothing in between like BSD spl() brain-damage.
+	 *
+	 * Furthermore, the IRQs on the INDY look basically (barring
+	 * software IRQs which we don't use at all) like:
+	 *
+	 *	MIPS IRQ	Source
+	 *      --------        ------
+	 *             0	Software (ignored)
+	 *             1        Software (ignored)
+	 *             2        Local IRQ level zero
+	 *             3        Local IRQ level one
+	 *             4        8254 Timer zero
+	 *             5        8254 Timer one
+	 *             6        Bus Error
+	 *             7        R4k timer (what we use)
+	 *
+	 * We handle the IRQ according to _our_ priority which is:
+	 *
+	 * Highest ----     R4k Timer
+	 *                  Local IRQ zero
+	 *                  Local IRQ one
+	 *                  Bus Error
+	 *                  8254 Timer zero
+	 * Lowest  ----     8254 Timer one
+	 *
+	 * then we just return, if multiple IRQs are pending then
+	 * we will just take another exception, big deal.
+	 */
+
+	.text
+	.set	noreorder
+	.set	noat
+	.align	5
+	NESTED(indyIRQ, PT_SIZE, sp)
+	SAVE_ALL
+	CLI
+	.set	at
+	mfc0	s0, CP0_CAUSE		# get irq mask
+	lui	s3, %hi(intr_count)
+
+	/* First we check for r4k counter/timer IRQ. */
+	andi	a0, s0, CAUSEF_IP7
+	beq	a0, zero, 1f
+	 andi	a0, s0, CAUSEF_IP2	# delay slot, check local level zero
+
+	/* Wheee, a timer interrupt. */
+	lw	s7, %lo(intr_count)(s3)
+	move	a0, sp
+	addiu	t0, s7, 1
+	jal	indy_timer_interrupt
+	 sw	t0, %lo(intr_count)(s3)	# delay slot, set intr_count
+
+	j	ret_from_sys_call
+	 sw	s7, %lo(intr_count)(s3)	# delay slot, restore intr_count
+
+1:
+	beq	a0, zero, 1f
+	 andi	a0, s0, CAUSEF_IP3	# delay slot, check local level one
+
+	/* Wheee, local level zero interrupt. */
+	lw	s7, %lo(intr_count)(s3)
+	move	a0, sp
+	addiu	t0, s7, 1
+
+	jal	indy_local0_irqdispatch
+	 sw	t0, %lo(intr_count)(s3)
+
+	j	ret_from_sys_call
+	 sw	s7, %lo(intr_count)(s3)	# delay slot, restore intr_count
+
+1:
+	beq	a0, zero, 1f
+	 andi	a0, s0, CAUSEF_IP6	# delay slot, check bus error
+
+	/* Wheee, local level one interrupt. */
+	lw	s7, %lo(intr_count)(s3)
+	move	a0, sp
+	addiu	t0, s7, 1
+	jal	indy_local1_irqdispatch
+	 sw	t0, %lo(intr_count)(s3)
+
+	j	ret_from_sys_call
+	 sw	s7, %lo(intr_count)(s3)
+
+1:
+	beq	a0, zero, 1f
+	 lw	s7, %lo(intr_count)(s3)
+
+	/* Wheee, an asynchronous bus error... */
+	addiu	t0, s7, 1
+	move	a0, sp
+	jal	indy_buserror_irq
+	 sw	t0, %lo(intr_count)(s3)
+
+	j	ret_from_sys_call
+	 sw	s7, %lo(intr_count)(s3)	
+
+1:
+	/* Here by mistake?  This is possible, what can happen
+	 * is that by the time we take the exception the IRQ
+	 * pin goes low, so just leave if this is the case.
+	 */
+	andi	a0, s0, (CAUSEF_IP4 | CAUSEF_IP5)
+	beq	a0, zero, 1f
+	 addiu	t0, s7, 1
+
+	/* Must be one of the 8254 timers... */
+	move	a0, sp
+	jal	indy_8254timer_irq
+	 sw	t0, %lo(intr_count)(s3)
+1:
+	j	ret_from_sys_call
+	 sw	s7, %lo(intr_count)(s3)
+	END(indyIRQ)
diff --git a/arch/mips/sgi/kernel/indy_hpc.c b/arch/mips/sgi/kernel/indy_hpc.c
new file mode 100644
index 000000000..30f3fe36b
--- /dev/null
+++ b/arch/mips/sgi/kernel/indy_hpc.c
@@ -0,0 +1,114 @@
+/* $Id: indy_hpc.c,v 1.4 1996/06/29 07:06:50 dm Exp $
+ * indy_hpc.c: Routines for generic manipulation of the HPC controllers.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <asm/segment.h>
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+#include <asm/sgihpc.h>
+#include <asm/sgint23.h>
+#include <asm/sgialib.h>
+
+/* #define DEBUG_SGIHPC */
+
+struct hpc3_regs *hpc3c0, *hpc3c1;
+struct hpc3_miscregs *hpc3mregs;
+
+/* We need software copies of these because they are write only. */
+static unsigned long write1, write2;
+
+/* Machine specific identifier knobs. */
+int sgi_has_ioc2 = 0;
+int sgi_guiness = 0;
+int sgi_boardid;
+
+void sgihpc_write1_modify(int set, int clear)
+{
+	write1 |= set;
+	write1 &= ~clear;
+	hpc3mregs->write1 = write1;
+}
+
+void sgihpc_write2_modify(int set, int clear)
+{
+	write2 |= set;
+	write2 &= ~clear;
+	hpc3mregs->write2 = write2;
+}
+
+void sgihpc_init(void)
+{
+	unsigned long sid, crev, brev;
+
+	hpc3c0 = (struct hpc3_regs *) (KSEG1 + HPC3_CHIP0_PBASE);
+	hpc3c1 = (struct hpc3_regs *) (KSEG1 + HPC3_CHIP1_PBASE);
+	hpc3mregs = (struct hpc3_miscregs *) (KSEG1 + HPC3_MREGS_PBASE);
+	sid = hpc3mregs->sysid;
+
+	sid &= 0xff;
+	crev = (sid & 0xe0) >> 5;
+	brev = (sid & 0x1e) >> 1;
+
+#ifdef DEBUG_SGIHPC
+	prom_printf("sgihpc_init: crev<%2x> brev<%2x>\n", crev, brev);
+	prom_printf("sgihpc_init: ");
+#endif
+
+	if(sid & 1) {
+#ifdef DEBUG_SGIHPC
+		prom_printf("GUINESS ");
+#endif
+		sgi_guiness = 1;
+	} else {
+#ifdef DEBUG_SGIHPC
+		prom_printf("FULLHOUSE ");
+#endif
+		sgi_guiness = 0;
+	}
+	sgi_boardid = brev;
+
+#ifdef DEBUG_SGIHPC
+	prom_printf("sgi_boardid<%d> ", sgi_boardid);
+#endif
+
+	if(crev == 1) {
+		if((sid & 1) || (brev >= 2)) {
+#ifdef DEBUG_SGIHPC
+			prom_printf("IOC2 ");
+#endif
+			sgi_has_ioc2 = 1;
+		} else {
+#ifdef DEBUG_SGIHPC
+			prom_printf("IOC1 revision 1 ");
+#endif
+		}
+	} else {
+#ifdef DEBUG_SGIHPC
+		prom_printf("IOC1 revision 0 ");
+#endif
+	}
+#ifdef DEBUG_SGIHPC
+	prom_printf("\n");
+#endif
+
+	write1 = (HPC3_WRITE1_PRESET |
+		  HPC3_WRITE1_KMRESET |
+		  HPC3_WRITE1_ERESET |
+		  HPC3_WRITE1_LC0OFF);
+
+	write2 = (HPC3_WRITE2_EASEL |
+		  HPC3_WRITE2_NTHRESH |
+		  HPC3_WRITE2_TPSPEED |
+		  HPC3_WRITE2_EPSEL |
+		  HPC3_WRITE2_U0AMODE |
+		  HPC3_WRITE2_U1AMODE);
+
+	if(!sgi_guiness)
+		write1 |= HPC3_WRITE1_GRESET;
+	hpc3mregs->write1 = write1;
+	hpc3mregs->write2 = write2;
+
+	hpc3c0->pbus_piocfgs[0][6] |= HPC3_PIOPCFG_HW;
+}
diff --git a/arch/mips/sgi/kernel/indy_int.c b/arch/mips/sgi/kernel/indy_int.c
new file mode 100644
index 000000000..45600d2de
--- /dev/null
+++ b/arch/mips/sgi/kernel/indy_int.c
@@ -0,0 +1,579 @@
+/* $Id: indy_int.c,v 1.12 1996/08/07 02:54:11 dm Exp $
+ * indy_int.c: Routines for generic manipulation of the INT[23] ASIC
+ *             found on INDY workstations..
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+#include <linux/config.h>
+
+#include <linux/errno.h>
+#include <linux/kernel_stat.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/timex.h>
+#include <linux/malloc.h>
+#include <linux/random.h>
+
+#include <asm/bitops.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+#include <asm/vector.h>
+
+#include <asm/segment.h>
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+#include <asm/sgi.h>
+#include <asm/sgihpc.h>
+#include <asm/sgint23.h>
+#include <asm/sgialib.h>
+
+/* #define DEBUG_SGINT */
+
+struct sgi_int2_regs *sgi_i2regs;
+struct sgi_int3_regs *sgi_i3regs;
+struct sgi_ioc_ints *ioc_icontrol;
+struct sgi_ioc_timers *ioc_timers;
+volatile unsigned char *ioc_tclear;
+
+static char lc0msk_to_irqnr[256];
+static char lc1msk_to_irqnr[256];
+static char lc2msk_to_irqnr[256];
+static char lc3msk_to_irqnr[256];
+
+extern asmlinkage void indyIRQ(void);
+
+#ifdef CONFIG_REMOTE_DEBUG
+extern void rs_kgdb_hook(int);
+#endif
+
+unsigned long spurious_count = 0;
+
+/* Local IRQ's are layed out logically like this:
+ *
+ * 0  --> 7   ==   local 0 interrupts
+ * 8  --> 15  ==   local 1 interrupts
+ * 16 --> 23  ==   vectored level 2 interrupts
+ * 24 --> 31  ==   vectored level 3 interrupts (not used)
+ */
+void disable_local_irq(unsigned int irq_nr)
+{
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	switch(irq_nr) {
+	case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
+		ioc_icontrol->imask0 &= ~(1 << irq_nr);
+		break;
+
+	case 8: case 9: case 10: case 11: case 12: case 13: case 14: case 15:
+		ioc_icontrol->imask1 &= ~(1 << (irq_nr - 8));
+		break;
+
+	case 16: case 17: case 18: case 19: case 20: case 21: case 22: case 23:
+		ioc_icontrol->cmeimask0 &= ~(1 << (irq_nr - 16));
+		break;
+
+	default:
+		/* This way we'll see if anyone would ever want vectored
+		 * level 3 interrupts.  Highly unlikely.
+		 */
+		printk("Yeeee, got passed irq_nr %d at disable_irq\n", irq_nr);
+		panic("INVALID IRQ level!");
+	};
+	restore_flags(flags);
+}
+
+void enable_local_irq(unsigned int irq_nr)
+{
+	unsigned long flags;
+	save_flags(flags);
+	cli();
+	switch(irq_nr) {
+	case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
+		ioc_icontrol->imask0 |= (1 << irq_nr);
+		break;
+
+	case 8: case 9: case 10: case 11: case 12: case 13: case 14: case 15:
+		ioc_icontrol->imask1 |= (1 << (irq_nr - 8));
+		break;
+
+	case 16: case 17: case 18: case 19: case 20: case 21: case 22: case 23:
+		enable_local_irq(7);
+		ioc_icontrol->cmeimask0 |= (1 << (irq_nr - 16));
+		break;
+
+	default:
+		printk("Yeeee, got passed irq_nr %d at disable_irq\n", irq_nr);
+		panic("INVALID IRQ level!");
+	};
+	restore_flags(flags);
+}
+
+void disable_gio_irq(unsigned int irq_nr)
+{
+	/* XXX TODO XXX */
+}
+
+void enable_gio_irq(unsigned int irq_nr)
+{
+	/* XXX TODO XXX */
+}
+
+void disable_hpcdma_irq(unsigned int irq_nr)
+{
+	/* XXX TODO XXX */
+}
+
+void enable_hpcdma_irq(unsigned int irq_nr)
+{
+	/* XXX TODO XXX */
+}
+
+void disable_irq(unsigned int irq_nr)
+{
+	unsigned int n = irq_nr;
+	if(n >= SGINT_END) {
+		printk("whee, invalid irq_nr %d\n", irq_nr);
+		panic("IRQ, you lose...");
+	}
+	if(n >= SGINT_LOCAL0 && n < SGINT_GIO) {
+		disable_local_irq(n - SGINT_LOCAL0);
+	} else if(n >= SGINT_GIO && n < SGINT_HPCDMA) {
+		disable_gio_irq(n - SGINT_GIO);
+	} else if(n >= SGINT_HPCDMA && n < SGINT_END) {
+		disable_hpcdma_irq(n - SGINT_HPCDMA);
+	} else {
+		panic("how did I get here?");
+	}
+}
+
+void enable_irq(unsigned int irq_nr)
+{
+	unsigned int n = irq_nr;
+	if(n >= SGINT_END) {
+		printk("whee, invalid irq_nr %d\n", irq_nr);
+		panic("IRQ, you lose...");
+	}
+	if(n >= SGINT_LOCAL0 && n < SGINT_GIO) {
+		enable_local_irq(n - SGINT_LOCAL0);
+	} else if(n >= SGINT_GIO && n < SGINT_HPCDMA) {
+		enable_gio_irq(n - SGINT_GIO);
+	} else if(n >= SGINT_HPCDMA && n < SGINT_END) {
+		enable_hpcdma_irq(n - SGINT_HPCDMA);
+	} else {
+		panic("how did I get here?");
+	}
+}
+
+static void local_unex(int irq, void *data, struct pt_regs *regs)
+{
+	printk("Whee: unexpected local IRQ at %08lx\n",
+	       (unsigned long) regs->cp0_epc);
+	printk("DUMP: stat0<%x> stat1<%x> vmeistat<%x>\n",
+	       ioc_icontrol->istat0, ioc_icontrol->istat1,
+	       ioc_icontrol->vmeistat);
+}
+
+static struct irqaction *local_irq_action[24] = {
+	NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL
+};
+
+int setup_indy_irq(int irq, struct irqaction * new)
+{
+	printk("setup_indy_irq: Yeee, don't know how to setup irq<%d> for %s  %p\n",
+	       irq, new->name, new->handler);
+	return 0;
+}
+
+static struct irqaction r4ktimer_action = {
+	NULL, 0, 0, "R4000 timer/counter", NULL, NULL,
+};
+
+static struct irqaction indy_berr_action = {
+	NULL, 0, 0, "IP22 Bus Error", NULL, NULL,
+};
+
+static struct irqaction *irq_action[16] = {
+	NULL, NULL, NULL, NULL,
+	NULL, NULL, &indy_berr_action, &r4ktimer_action,
+	NULL, NULL, NULL, NULL,
+	NULL, NULL, NULL, NULL
+};
+
+int get_irq_list(char *buf)
+{
+	int i, len = 0;
+	int num = 0;
+	struct irqaction * action;
+
+	for (i = 0 ; i < 16 ; i++, num++) {
+		action = irq_action[i];
+		if (!action) 
+			continue;
+		len += sprintf(buf+len, "%2d: %8d %c %s",
+			num, kstat.interrupts[num],
+			(action->flags & SA_INTERRUPT) ? '+' : ' ',
+			action->name);
+		for (action=action->next; action; action = action->next) {
+			len += sprintf(buf+len, ",%s %s",
+				(action->flags & SA_INTERRUPT) ? " +" : "",
+				action->name);
+		}
+		len += sprintf(buf+len, " [on-chip]\n");
+	}
+	for (i = 0 ; i < 24 ; i++, num++) {
+		action = local_irq_action[i];
+		if (!action) 
+			continue;
+		len += sprintf(buf+len, "%2d: %8d %c %s",
+			num, kstat.interrupts[num],
+			(action->flags & SA_INTERRUPT) ? '+' : ' ',
+			action->name);
+		for (action=action->next; action; action = action->next) {
+			len += sprintf(buf+len, ",%s %s",
+				(action->flags & SA_INTERRUPT) ? " +" : "",
+				action->name);
+		}
+		len += sprintf(buf+len, " [local]\n");
+	}
+	return len;
+}
+
+/*
+ * do_IRQ handles IRQ's that have been installed without the
+ * SA_INTERRUPT flag: it uses the full signal-handling return
+ * and runs with other interrupts enabled. All relatively slow
+ * IRQ's should use this format: notably the keyboard/timer
+ * routines.
+ */
+asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
+{
+	struct irqaction * action = *(irq + irq_action);
+	kstat.interrupts[irq]++;
+	printk("Got irq %d, press a key.", irq);
+	prom_getchar();
+	romvec->imode();
+        while (action) {
+		if (action->flags & SA_SAMPLE_RANDOM)
+			add_interrupt_randomness(irq);
+		action->handler(irq, action->dev_id, regs);
+		action = action->next;
+        }
+}
+
+/*
+ * do_fast_IRQ handles IRQ's that don't need the fancy interrupt return
+ * stuff - the handler is also running with interrupts disabled unless
+ * it explicitly enables them later.
+ */
+asmlinkage void do_fast_IRQ(int irq)
+{
+	struct irqaction * action = *(irq + irq_action);
+
+	printk("Got irq %d, press a key.", irq);
+	prom_getchar();
+	romvec->imode();
+	kstat.interrupts[irq]++;
+        while (action) {
+		if (action->flags & SA_SAMPLE_RANDOM)
+			add_interrupt_randomness(irq);
+		action->handler(irq, action->dev_id, NULL);
+		action = action->next;
+        }
+}
+
+int request_local_irq(unsigned int lirq, void (*func)(int, void *, struct pt_regs *),
+		      unsigned long iflags, const char *dname, void *devid)
+{
+	struct irqaction *action;
+
+	lirq -= SGINT_LOCAL0;
+	if(lirq >= 24 || !func)
+		return -EINVAL;
+
+	action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);
+	if(!action)
+		return -ENOMEM;
+
+	action->handler = func;
+	action->flags = iflags;
+	action->mask = 0;
+	action->name = dname;
+	action->dev_id = devid;
+	action->next = 0;
+	local_irq_action[lirq] = action;
+	enable_irq(lirq + SGINT_LOCAL0);
+	return 0;
+}
+
+void free_local_irq(unsigned int lirq, void *dev_id)
+{
+	struct irqaction *action;
+
+	lirq -= SGINT_LOCAL0;
+	if(lirq >= 24) {
+		printk("Aieee: trying to free bogus local irq %d\n",
+		       lirq + SGINT_LOCAL0);
+		return;
+	}
+	action = local_irq_action[lirq];
+	local_irq_action[lirq] = NULL;
+	disable_irq(lirq + SGINT_LOCAL0);
+	kfree(action);
+}
+
+int request_irq(unsigned int irq, 
+		void (*handler)(int, void *, struct pt_regs *),
+		unsigned long irqflags, 
+		const char * devname,
+		void *dev_id)
+{
+	int retval;
+	struct irqaction * action;
+
+	if (irq >= SGINT_END)
+		return -EINVAL;
+	if (!handler)
+		return -EINVAL;
+
+	if((irq >= SGINT_LOCAL0) && (irq < SGINT_GIO))
+		return request_local_irq(irq, handler, irqflags, devname, dev_id);
+
+	action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);
+	if (!action)
+		return -ENOMEM;
+
+	action->handler = handler;
+	action->flags = irqflags;
+	action->mask = 0;
+	action->name = devname;
+	action->next = NULL;
+	action->dev_id = dev_id;
+
+	retval = setup_indy_irq(irq, action);
+
+	if (retval)
+		kfree(action);
+	return retval;
+}
+		
+void free_irq(unsigned int irq, void *dev_id)
+{
+	struct irqaction * action, **p;
+	unsigned long flags;
+
+	if (irq >= SGINT_END) {
+		printk("Trying to free IRQ%d\n",irq);
+		return;
+	}
+	if((irq >= SGINT_LOCAL0) && (irq < SGINT_GIO)) {
+		free_local_irq(irq, dev_id);
+		return;
+	}
+	for (p = irq + irq_action; (action = *p) != NULL; p = &action->next) {
+		if (action->dev_id != dev_id)
+			continue;
+
+		/* Found it - now free it */
+		save_flags(flags);
+		cli();
+		*p = action->next;
+		restore_flags(flags);
+		kfree(action);
+		return;
+	}
+	printk("Trying to free free IRQ%d\n",irq);
+}
+
+void init_IRQ(void)
+{
+	int i;
+
+	for (i = 0; i < 16 ; i++)
+		set_int_vector(i, 0);
+	irq_setup();
+}
+
+void indy_local0_irqdispatch(struct pt_regs *regs)
+{
+	struct irqaction *action;
+	unsigned char mask = ioc_icontrol->istat0;
+	unsigned char mask2 = 0;
+	int irq;
+
+	mask &= ioc_icontrol->imask0;
+	if(mask & ISTAT0_LIO2) {
+		mask2 = ioc_icontrol->vmeistat;
+		mask2 &= ioc_icontrol->cmeimask0;
+		irq = lc2msk_to_irqnr[mask2];
+		action = local_irq_action[irq];
+	} else {
+		irq = lc0msk_to_irqnr[mask];
+		action = local_irq_action[irq];
+	}
+#if 0
+	printk("local0_dispatch: got irq %d mask %2x mask2 %2x\n",
+	       irq, mask, mask2);
+	prom_getchar();
+#endif
+	kstat.interrupts[irq + 16]++;
+	action->handler(irq, action->dev_id, regs);
+}
+
+void indy_local1_irqdispatch(struct pt_regs *regs)
+{
+	struct irqaction *action;
+	unsigned char mask = ioc_icontrol->istat1;
+	unsigned char mask2 = 0;
+	int irq;
+
+	mask &= ioc_icontrol->imask1;
+	if(mask & ISTAT1_LIO3) {
+		printk("WHee: Got an LIO3 irq, winging it...\n");
+		mask2 = ioc_icontrol->vmeistat;
+		mask2 &= ioc_icontrol->cmeimask1;
+		irq = lc3msk_to_irqnr[ioc_icontrol->vmeistat];
+		action = local_irq_action[irq];
+	} else {
+		irq = lc1msk_to_irqnr[mask];
+		action = local_irq_action[irq];
+	}
+#if 0
+	printk("local1_dispatch: got irq %d mask %2x mask2 %2x\n",
+	       irq, mask, mask2);
+	prom_getchar();
+#endif
+	kstat.interrupts[irq + 24]++;
+	action->handler(irq, action->dev_id, regs);
+}
+
+void indy_buserror_irq(struct pt_regs *regs)
+{
+	kstat.interrupts[6]++;
+	printk("Got a bus error IRQ, shouldn't happen yet\n");
+	show_regs(regs);
+	printk("Spinning...\n");
+	while(1)
+		;
+}
+
+/* Misc. crap just to keep the kernel linking... */
+unsigned long probe_irq_on (void)
+{
+	return 0;
+}
+
+int probe_irq_off (unsigned long irqs)
+{
+	return 0;
+}
+
+void sgint_init(void)
+{
+	int i;
+#ifdef CONFIG_REMOTE_DEBUG
+	char *ctype;
+#endif
+
+	sgi_i2regs = (struct sgi_int2_regs *) (KSEG1 + SGI_INT2_BASE);
+	sgi_i3regs = (struct sgi_int3_regs *) (KSEG1 + SGI_INT3_BASE);
+
+	/* Init local mask --> irq tables. */
+	for(i = 0; i < 256; i++) {
+		if(i & 0x80) {
+			lc0msk_to_irqnr[i] = 7;
+			lc1msk_to_irqnr[i] = 15;
+			lc2msk_to_irqnr[i] = 23;
+			lc3msk_to_irqnr[i] = 31;
+		} else if(i & 0x40) {
+			lc0msk_to_irqnr[i] = 6;
+			lc1msk_to_irqnr[i] = 14;
+			lc2msk_to_irqnr[i] = 22;
+			lc3msk_to_irqnr[i] = 30;
+		} else if(i & 0x20) {
+			lc0msk_to_irqnr[i] = 5;
+			lc1msk_to_irqnr[i] = 13;
+			lc2msk_to_irqnr[i] = 21;
+			lc3msk_to_irqnr[i] = 29;
+		} else if(i & 0x10) {
+			lc0msk_to_irqnr[i] = 4;
+			lc1msk_to_irqnr[i] = 12;
+			lc2msk_to_irqnr[i] = 20;
+			lc3msk_to_irqnr[i] = 28;
+		} else if(i & 0x08) {
+			lc0msk_to_irqnr[i] = 3;
+			lc1msk_to_irqnr[i] = 11;
+			lc2msk_to_irqnr[i] = 19;
+			lc3msk_to_irqnr[i] = 27;
+		} else if(i & 0x04) {
+			lc0msk_to_irqnr[i] = 2;
+			lc1msk_to_irqnr[i] = 10;
+			lc2msk_to_irqnr[i] = 18;
+			lc3msk_to_irqnr[i] = 26;
+		} else if(i & 0x02) {
+			lc0msk_to_irqnr[i] = 1;
+			lc1msk_to_irqnr[i] = 9;
+			lc2msk_to_irqnr[i] = 17;
+			lc3msk_to_irqnr[i] = 25;
+		} else if(i & 0x01) {
+			lc0msk_to_irqnr[i] = 0;
+			lc1msk_to_irqnr[i] = 8;
+			lc2msk_to_irqnr[i] = 16;
+			lc3msk_to_irqnr[i] = 24;
+		} else {
+			lc0msk_to_irqnr[i] = 0;
+			lc1msk_to_irqnr[i] = 0;
+			lc2msk_to_irqnr[i] = 0;
+			lc3msk_to_irqnr[i] = 0;
+		}
+	}
+
+	ioc_icontrol = &sgi_i3regs->ints;
+	ioc_timers = &sgi_i3regs->timers;
+	ioc_tclear = &sgi_i3regs->tclear;
+
+	/* Mask out all interrupts. */
+	ioc_icontrol->imask0 = 0;
+	ioc_icontrol->imask1 = 0;
+	ioc_icontrol->cmeimask0 = 0;
+	ioc_icontrol->cmeimask1 = 0;
+
+	/* Now safe to set the exception vector. */
+	set_except_vector(0, indyIRQ);
+
+#ifdef CONFIG_REMOTE_DEBUG
+	ctype = prom_getcmdline();
+	for(i = 0; i < strlen(ctype); i++) {
+		if(ctype[i]=='k' && ctype[i+1]=='g' &&
+		   ctype[i+2]=='d' && ctype[i+3]=='b' &&
+		   ctype[i+4]=='=' && ctype[i+5]=='t' &&
+		   ctype[i+6]=='t' && ctype[i+7]=='y' &&
+		   ctype[i+8]=='d' &&
+		   (ctype[i+9] == '1' || ctype[i+9] == '2')) {
+			printk("KGDB: Using serial line /dev/ttyd%d for "
+			       "session\n", (ctype[i+9] - '0'));
+				if(ctype[i+9]=='1')
+					rs_kgdb_hook(1);
+				else if(ctype[i+9]=='2')
+					rs_kgdb_hook(0);
+				else {
+					printk("KGDB: whoops bogon tty line "
+					       "requested, disabling session\n");
+				}
+
+		}
+	}
+#endif
+}
diff --git a/arch/mips/sgi/kernel/indy_mc.c b/arch/mips/sgi/kernel/indy_mc.c
new file mode 100644
index 000000000..b2f35018c
--- /dev/null
+++ b/arch/mips/sgi/kernel/indy_mc.c
@@ -0,0 +1,153 @@
+/* $Id: indy_mc.c,v 1.5 1996/06/29 07:06:51 dm Exp $
+ * indy_mc.c: Routines for manipulating the INDY memory controller.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <asm/segment.h>
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+#include <asm/sgimc.h>
+#include <asm/sgihpc.h>
+#include <asm/sgialib.h>
+
+/* #define DEBUG_SGIMC */
+
+struct sgimc_misc_ctrl *mcmisc_regs;
+unsigned long *rpsscounter;
+struct sgimc_dma_ctrl *dmactrlregs;
+
+static inline char *mconfig_string(unsigned long val)
+{
+	switch(val & SGIMC_MCONFIG_RMASK) {
+	case SGIMC_MCONFIG_FOURMB:
+		return "4MB";
+
+	case SGIMC_MCONFIG_EIGHTMB:
+		return "8MB";
+
+	case SGIMC_MCONFIG_SXTEENMB:
+		return "16MB";
+
+	case SGIMC_MCONFIG_TTWOMB:
+		return "32MB";
+
+	case SGIMC_MCONFIG_SFOURMB:
+		return "64MB";
+
+	case SGIMC_MCONFIG_OTEIGHTMB:
+		return "128MB";
+
+	default:
+		return "wheee, unknown";
+	};
+}
+
+void sgimc_init(void)
+{
+	unsigned long tmpreg;
+
+	mcmisc_regs = (struct sgimc_misc_ctrl *)(KSEG1+0x1fa00000);
+	rpsscounter = (unsigned long *) (KSEG1 + 0x1fa01004);
+	dmactrlregs = (struct sgimc_dma_ctrl *) (KSEG1+0x1fa02000);
+
+	printk("MC: SGI memory controller Revision %d\n",
+	       (int) mcmisc_regs->systemid & SGIMC_SYSID_MASKREV);
+
+#if 0 /* XXX Until I figure out what this bit really indicates XXX */
+	/* XXX Is this systemid bit reliable? */
+	if(mcmisc_regs->systemid & SGIMC_SYSID_EPRESENT) {
+		EISA_bus = 1;
+		printk("with EISA\n");
+	} else {
+		EISA_bus = 0;
+		printk("no EISA\n");
+	}
+#endif
+
+#ifdef DEBUG_SGIMC
+	prom_printf("sgimc_init: memconfig0<%s> mconfig1<%s>\n",
+		    mconfig_string(mcmisc_regs->mconfig0),
+		    mconfig_string(mcmisc_regs->mconfig1));
+
+	prom_printf("mcdump: cpuctrl0<%08lx> cpuctrl1<%08lx>\n",
+		    mcmisc_regs->cpuctrl0, mcmisc_regs->cpuctrl1);
+	prom_printf("mcdump: divider<%08lx>, gioparm<%04x>\n",
+		    mcmisc_regs->divider, mcmisc_regs->gioparm);
+#endif
+
+	/* Place the MC into a known state.  This must be done before
+	 * interrupts are first enabled etc.
+	 */
+
+	/* Step 1: The CPU/GIO error status registers will not latch
+	 *         up a new error status until the register has been
+	 *         cleared by the cpu.  These status registers are
+	 *         cleared by writing any value to them.
+	 */
+	mcmisc_regs->cstat = mcmisc_regs->gstat = 0;
+
+	/* Step 2: Enable all parity checking in cpu control register
+	 *         zero.
+	 */
+	tmpreg = mcmisc_regs->cpuctrl0;
+	tmpreg |= (SGIMC_CCTRL0_EPERRGIO | SGIMC_CCTRL0_EPERRMEM |
+		   SGIMC_CCTRL0_R4KNOCHKPARR);
+	mcmisc_regs->cpuctrl0 = tmpreg;
+
+	/* Step 3: Setup the MC write buffer depth, this is controlled
+	 *         in cpu control register 1 in the lower 4 bits.
+	 */
+	tmpreg = mcmisc_regs->cpuctrl1;
+	tmpreg &= ~0xf;
+	tmpreg |= 0xd;
+	mcmisc_regs->cpuctrl1 = tmpreg;
+
+	/* Step 4: Initialize the RPSS divider register to run as fast
+	 *         as it can correctly operate.  The register is laid
+	 *         out as follows:
+	 *
+	 *         ----------------------------------------
+	 *         |  RESERVED  |   INCREMENT   | DIVIDER |
+	 *         ----------------------------------------
+	 *          31        16 15            8 7       0
+	 *
+	 *         DIVIDER determines how often a 'tick' happens,
+	 *         INCREMENT determines by how the RPSS increment
+	 *         registers value increases at each 'tick'. Thus,
+	 *         for IP22 we get INCREMENT=1, DIVIDER=1 == 0x101
+	 */
+	mcmisc_regs->divider = 0x101;
+
+	/* Step 5: Initialize GIO64 arbitrator configuration register.
+	 *
+	 * NOTE: If you dork with startup code the HPC init code in
+	 *       sgihpc_init() must run before us because of how we
+	 *       need to know Guiness vs. FullHouse and the board
+	 *       revision on this machine.  You have been warned.
+	 */
+
+	/* First the basic invariants across all gio64 implementations. */
+	tmpreg = SGIMC_GIOPARM_HPC64;    /* All 1st HPC's interface at 64bits. */
+	tmpreg |= SGIMC_GIOPARM_ONEBUS;  /* Only one physical GIO bus exists. */
+
+	if(sgi_guiness) {
+		/* Guiness specific settings. */
+		tmpreg |= SGIMC_GIOPARM_EISA64;     /* MC talks to EISA at 64bits */
+		tmpreg |= SGIMC_GIOPARM_MASTEREISA; /* EISA bus can act as master */
+	} else {
+		/* Fullhouse specific settings. */
+		if(sgi_boardid < 2) {
+			tmpreg |= SGIMC_GIOPARM_HPC264; /* 2nd HPC at 64bits */
+			tmpreg |= SGIMC_GIOPARM_PLINEEXP0; /* exp0 pipelines */
+			tmpreg |= SGIMC_GIOPARM_MASTEREXP1;/* exp1 masters */
+			tmpreg |= SGIMC_GIOPARM_RTIMEEXP0; /* exp0 is realtime */
+		} else {
+			tmpreg |= SGIMC_GIOPARM_HPC264; /* 2nd HPC 64bits */
+			tmpreg |= SGIMC_GIOPARM_PLINEEXP0; /* exp[01] pipelined */
+			tmpreg |= SGIMC_GIOPARM_PLINEEXP1;
+			tmpreg |= SGIMC_GIOPARM_MASTEREISA;/* EISA masters */
+		}
+	}
+	mcmisc_regs->gioparm = tmpreg; /* poof */
+}
diff --git a/arch/mips/sgi/kernel/indy_timer.c b/arch/mips/sgi/kernel/indy_timer.c
new file mode 100644
index 000000000..9aa88cb18
--- /dev/null
+++ b/arch/mips/sgi/kernel/indy_timer.c
@@ -0,0 +1,298 @@
+/* $Id: indy_timer.c,v 1.10 1996/08/07 02:54:11 dm Exp $
+ * indy_timer.c: Setting up the clock on the INDY 8254 controller.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/timex.h>
+#include <linux/kernel_stat.h>
+
+#include <asm/bootinfo.h>
+#include <asm/segment.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/ptrace.h>
+#include <asm/system.h>
+#include <asm/sgi.h>
+#include <asm/sgialib.h>
+#include <asm/sgihpc.h>
+#include <asm/sgint23.h>
+
+/* The layout of registers for the INDY Dallas 1286 clock chipset. */
+struct indy_clock {
+        volatile unsigned int hsec;
+        volatile unsigned int sec;
+        volatile unsigned int min;
+        volatile unsigned int malarm;
+        volatile unsigned int hr;
+        volatile unsigned int halarm;
+        volatile unsigned int day;
+        volatile unsigned int dalarm;
+        volatile unsigned int date;
+        volatile unsigned int month;
+        volatile unsigned int year;
+        volatile unsigned int cmd;
+        volatile unsigned int whsec;
+        volatile unsigned int wsec;
+        volatile unsigned int _unused0[50];
+};
+
+#define INDY_CLOCK_REGS ((struct indy_clock *)(KSEG1ADDR(0x1fbe0000)))
+
+/* Because of a bug in the i8254 timer we need to use the onchip r4k
+ * counter as our system wide timer interrupt running at 100HZ.
+ */
+static unsigned long r4k_offset; /* Amount to increment compare reg each time */
+static unsigned long r4k_cur;    /* What counter should be at next timer irq */
+
+static inline void ack_r4ktimer(unsigned long newval)
+{
+	write_32bit_cp0_register(CP0_COMPARE, newval);
+}
+
+static int set_rtc_mmss(unsigned long nowtime)
+{
+	struct indy_clock *clock = INDY_CLOCK_REGS;
+	int retval = 0;
+	int real_seconds, real_minutes, clock_minutes;
+
+#define FROB_FROM_CLOCK(x) (((x) & 0xf) | ((((x) & 0xf0) >> 4) * 10));
+#define FROB_TO_CLOCK(x)  ((((((x) & 0xff) / 10)<<4) | (((x) & 0xff) % 10)) & 0xff)
+
+	clock->cmd &= ~(0x80);
+	clock_minutes = clock->min;
+	clock->cmd |= (0x80);
+
+	clock_minutes = FROB_FROM_CLOCK(clock_minutes);
+	real_seconds = nowtime % 60;
+	real_minutes = nowtime / 60;
+
+	if(((abs(real_minutes - clock_minutes) + 15)/30) & 1)
+		real_minutes += 30; /* correct for half hour time zone */
+
+	real_minutes %= 60;
+	if(abs(real_minutes - clock_minutes) < 30) {
+		/* Force clock oscillator to be on. */
+		clock->month &= ~(0x80);
+
+		/* Write real_seconds and real_minutes into the Dallas. */
+		clock->cmd &= ~(0x80);
+		clock->sec = real_seconds;
+		clock->min = real_minutes;
+		clock->cmd |= (0x80);
+	} else
+		return -1;
+
+#undef FROB_FROM_CLOCK
+#undef FROB_TO_CLOCK
+
+	return retval;
+}
+
+static long last_rtc_update = 0;
+
+void indy_timer_interrupt(struct pt_regs *regs)
+{
+	/* Ack timer and compute new compare. */
+	r4k_cur = (read_32bit_cp0_register(CP0_COUNT) + r4k_offset);
+	ack_r4ktimer(r4k_cur);
+	kstat.interrupts[7]++;
+	do_timer(regs);
+
+	/* We update the Dallas time of day approx. every 11 minutes,
+	 * because of how the numbers work out we need to make
+	 * absolutely sure we do this update within 500ms before the
+	 * next second starts, thus the following code.
+	 */
+	if (time_state != TIME_BAD && xtime.tv_sec > last_rtc_update + 660 &&
+	    xtime.tv_usec > 500000 - (tick >> 1) &&
+	    xtime.tv_usec < 500000 + (tick >> 1))
+	  if (set_rtc_mmss(xtime.tv_sec) == 0)
+	    last_rtc_update = xtime.tv_sec;
+	  else
+	    last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */
+}
+
+static inline unsigned long dosample(volatile unsigned char *tcwp,
+				     volatile unsigned char *tc2p)
+{
+	unsigned long ct0, ct1;
+	unsigned char msb, lsb;
+
+	/* Start the counter. */
+	*tcwp = (SGINT_TCWORD_CNT2 | SGINT_TCWORD_CALL | SGINT_TCWORD_MRGEN);
+	*tc2p = (SGINT_TCSAMP_COUNTER & 0xff);
+	*tc2p = (SGINT_TCSAMP_COUNTER >> 8);
+
+	/* Get initial counter invariant */
+	ct0 = read_32bit_cp0_register(CP0_COUNT);
+
+	/* Latch and spin until top byte of counter2 is zero */
+	*tcwp = (SGINT_TCWORD_CNT2 | SGINT_TCWORD_CLAT);
+	ct1 = read_32bit_cp0_register(CP0_COUNT);
+	lsb = *tc2p;
+	msb = *tc2p;
+	while(msb) {
+		*tcwp = (SGINT_TCWORD_CNT2 | SGINT_TCWORD_CLAT);
+		ct1 = read_32bit_cp0_register(CP0_COUNT);
+		lsb = *tc2p;
+		msb = *tc2p;
+	}
+
+	/* Stop the counter. */
+	*tcwp = (SGINT_TCWORD_CNT2 | SGINT_TCWORD_CALL | SGINT_TCWORD_MSWST);
+
+	/* Return the difference, this is how far the r4k counter increments
+	 * for every one HZ.
+	 */
+	return ct1 - ct0;
+}
+
+/* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
+ * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
+ * => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
+ *
+ * [For the Julian calendar (which was used in Russia before 1917,
+ * Britain & colonies before 1752, anywhere else before 1582,
+ * and is still in use by some communities) leave out the
+ * -year/100+year/400 terms, and add 10.]
+ *
+ * This algorithm was first published by Gauss (I think).
+ *
+ * WARNING: this function will overflow on 2106-02-07 06:28:16 on
+ * machines were long is 32-bit! (However, as time_t is signed, we
+ * will already get problems at other places on 2038-01-19 03:14:08)
+ */
+static inline unsigned long mktime(unsigned int year, unsigned int mon,
+	unsigned int day, unsigned int hour,
+	unsigned int min, unsigned int sec)
+{
+	if (0 >= (int) (mon -= 2)) {	/* 1..12 -> 11,12,1..10 */
+		mon += 12;	/* Puts Feb last since it has leap day */
+		year -= 1;
+	}
+	return (((
+	    (unsigned long)(year/4 - year/100 + year/400 + 367*mon/12 + day) +
+	      year*365 - 719499
+	    )*24 + hour /* now have hours */
+	   )*60 + min /* now have minutes */
+	  )*60 + sec; /* finally seconds */
+}
+
+unsigned long get_indy_time(void)
+{
+	struct indy_clock *clock = INDY_CLOCK_REGS;
+	unsigned int year, mon, day, hour, min, sec;
+
+	/* Freeze it. */
+	clock->cmd &= ~(0x80);
+
+	/* Read regs. */
+	sec = clock->sec;
+	min = clock->min;
+	hour = (clock->hr & 0x3f);
+	day = (clock->date & 0x3f);
+	mon = (clock->month & 0x1f);
+	year = clock->year;
+
+	/* Unfreeze clock. */
+	clock->cmd |= 0x80;
+
+	/* Frob the bits. */
+#define FROB1(x)  (((x) & 0xf) + ((((x) & 0xf0) >> 4) * 10));
+#define FROB2(x)  (((x) & 0xf) + (((((x) & 0xf0) >> 4) & 0x3) * 10));
+
+	/* XXX Should really check that secs register is the same
+	 * XXX as when we first read it and if not go back and
+	 * XXX read the regs above again.
+	 */
+	sec = FROB1(sec); min = FROB1(min); day = FROB1(day);
+	mon = FROB1(mon); year = FROB1(year);
+	hour = FROB2(hour);
+
+#undef FROB1
+#undef FROB2
+
+	/* Wheee... */
+	if(year < 45)
+		year += 30;
+	if ((year += 1940) < 1970)
+		year += 100;
+
+	return mktime(year, mon, day, hour, min, sec);
+}
+
+#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)
+
+void indy_timer_init(void)
+{
+	struct sgi_ioc_timers *p;
+	volatile unsigned char *tcwp, *tc2p;
+
+	/* Figure out the r4k offset, the algorithm is very simple
+	 * and works in _all_ cases as long as the 8254 counter
+	 * register itself works ok (as an interrupt driving timer
+	 * it does not because of bug, this is why we are using
+	 * the onchip r4k counter/compare register to serve this
+	 * purpose, but for r4k_offset calculation it will work
+	 * ok for us).  There are other very complicated ways
+	 * of performing this calculation but this one works just
+	 * fine so I am not going to futz around. ;-)
+	 */
+	p = ioc_timers;
+	tcwp = &p->tcword;
+	tc2p = &p->tcnt2;
+
+	printk("calculating r4koff... ");
+	r4k_offset = dosample(tcwp, tc2p);  /* First sample. */
+	dosample(tcwp, tc2p);               /* Eat one... */
+	r4k_offset += dosample(tcwp, tc2p); /* Second sample. */
+	r4k_offset = (r4k_offset >> 1);     /* Get average. */
+	r4k_offset = HZ * r4k_offset;       /* Multiply by HZ */
+
+	printk("%08lx(%d)\n", r4k_offset, (int) r4k_offset);
+
+	r4k_cur = (read_32bit_cp0_register(CP0_COUNT) + r4k_offset);
+	write_32bit_cp0_register(CP0_COMPARE, r4k_cur);
+	set_cp0_status(ST0_IM, ALLINTS);
+	sti();
+
+	/* Read time from the dallas chipset. */
+	xtime.tv_sec = get_indy_time();
+	xtime.tv_usec = 0;
+}
+
+void indy_8254timer_irq(void)
+{
+	kstat.interrupts[4]++;
+	printk("indy_8254timer_irq: Whoops, should not have gotten this IRQ\n");
+	prom_getchar();
+	prom_imode();
+}
+
+void do_gettimeofday(struct timeval *tv)
+{
+	unsigned long flags;
+
+	save_flags(flags); cli();
+	*tv = xtime;
+	restore_flags(flags);
+}
+
+void do_settimeofday(struct timeval *tv)
+{
+	cli();
+	xtime = *tv;
+	time_state = TIME_BAD;
+	time_maxerror = MAXPHASE;
+	time_esterror = MAXPHASE;
+	sti();
+}
+
diff --git a/arch/mips/sgi/kernel/reset.c b/arch/mips/sgi/kernel/reset.c
new file mode 100644
index 000000000..4e7455952
--- /dev/null
+++ b/arch/mips/sgi/kernel/reset.c
@@ -0,0 +1,14 @@
+/*
+ *  linux/arch/mips/sgi/kernel/process.c
+ *
+ *  Reset a SGI.
+ */
+#include <asm/io.h>
+#include <asm/system.h>
+
+void
+sgi_hard_reset_now(void)
+{
+        for(;;)
+                prom_imode();
+}
diff --git a/arch/mips/sgi/kernel/setup.c b/arch/mips/sgi/kernel/setup.c
new file mode 100644
index 000000000..61b67df75
--- /dev/null
+++ b/arch/mips/sgi/kernel/setup.c
@@ -0,0 +1,83 @@
+/* $Id: setup.c,v 1.11 1996/06/29 07:06:51 dm Exp $
+ * setup.c: SGI specific setup, including init of the feature struct.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+#ifndef __GOGOGO__
+#error "... about to fuckup your Indy?"
+#endif
+#include <linux/kernel.h>
+#include <linux/sched.h>
+
+#include <asm/vector.h>
+#include <asm/sgialib.h>
+#include <asm/sgi.h>
+#include <asm/sgimc.h>
+#include <asm/sgihpc.h>
+#include <asm/sgint23.h>
+
+extern int serial_console; /* in console.c, of course */
+
+struct feature sgi_feature = {
+};
+
+static void sgi_irq_setup(void)
+{
+	sgint_init();
+}
+
+#if 0
+extern void register_console(void (*proc)(const char *));
+
+static void sgi_print(const char *p)
+{
+	char c;
+
+	while((c = *p++) != 0) {
+		if(c == '\n')
+			prom_putchar('\r');
+		prom_putchar(c);
+	}
+}
+#endif
+
+void sgi_setup(void)
+{
+	char *ctype;
+
+	irq_setup = sgi_irq_setup;
+	feature = &sgi_feature;
+	hard_reset_now = acn_hard_reset_now;
+
+	/* register_console(sgi_print); */
+
+	sgi_sysinit();
+
+	/* Init the INDY HPC I/O controller.  Need to call this before
+	 * fucking with the memory controller because it needs to know the
+	 * boardID and whether this is a Guiness or a FullHouse machine.
+	 */
+	sgihpc_init();
+
+	/* Init INDY memory controller. */
+	sgimc_init();
+
+	/* ARCS console environment variable is set to "g?" for
+	 * graphics console, it is set to "d" for the first serial
+	 * line and "d2" for the second serial line.
+	 */
+	ctype = prom_getenv("console");
+	serial_console = 0;
+	if(*ctype == 'd') {
+		if(*(ctype+1)=='2')
+			serial_console = 1;
+		else
+			serial_console = 2;
+		if(!serial_console) {
+			prom_printf("Weird console env setting %s\n", ctype);
+			prom_printf("Press a key to reboot.\n");
+			prom_getchar();
+			prom_imode();
+		}
+	}
+}
diff --git a/arch/mips/sgi/kernel/system.c b/arch/mips/sgi/kernel/system.c
new file mode 100644
index 000000000..051ad09c5
--- /dev/null
+++ b/arch/mips/sgi/kernel/system.c
@@ -0,0 +1,168 @@
+/* $Id: system.c,v 1.2 1996/06/10 16:38:32 dm Exp $
+ * system.c: Probe the system type using ARCS prom interface library.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/string.h>
+
+#include <asm/sgi.h>
+#include <asm/sgialib.h>
+#include <asm/bootinfo.h>
+
+#ifndef __GOGOGO__
+#error "... You're fearless, aren't you?"
+#endif
+
+enum sgi_mach sgimach;
+
+struct smatch {
+	char *name;
+	int type;
+};
+
+static struct smatch sgi_mtable[] = {
+	{ "SGI-IP4", ip4 },
+	{ "SGI-IP5", ip5 },
+	{ "SGI-IP6", ip6 },
+	{ "SGI-IP7", ip7 },
+	{ "SGI-IP9", ip9 },
+	{ "SGI-IP12", ip12 },
+	{ "SGI-IP15", ip15 },
+	{ "SGI-IP17", ip17 },
+	{ "SGI-IP19", ip19 },
+	{ "SGI-IP20", ip20 },
+	{ "SGI-IP21", ip21 },
+	{ "SGI-IP22", ip22 },
+	{ "SGI-IP25", ip25 },
+	{ "SGI-IP26", ip26 },
+	{ "SGI-IP28", ip28 },
+	{ "SGI-IP30", ip30 },
+	{ "SGI-IP32", ip32 }
+};
+
+#define NUM_MACHS 17 /* for now */
+
+static struct smatch sgi_cputable[] = {
+	{ "MIPS-R2000", CPU_R2000 },
+	{ "MIPS-R3000", CPU_R3000 },
+	{ "MIPS-R3000A", CPU_R3000A },
+	{ "MIPS-R4000", CPU_R4000SC },
+	{ "MIPS-R4400", CPU_R4400SC },
+	{ "MIPS-R4600", CPU_R4600 },
+	{ "MIPS-R8000", CPU_R8000 },
+	{ "MIPS-R5000", CPU_R5000 },
+	{ "MIPS-R5000A", CPU_R5000A }
+};
+
+#define NUM_CPUS 9 /* for now */
+
+static enum sgi_mach string_to_mach(char *s)
+{
+	int i;
+
+	for(i = 0; i < NUM_MACHS; i++) {
+		if(!strcmp(s, sgi_mtable[i].name))
+			return (enum sgi_mach) sgi_mtable[i].type;
+	}
+	prom_printf("\nYeee, could not determine SGI architecture type <%s>\n", s);
+	prom_printf("press a key to reboot\n");
+	prom_getchar();
+	romvec->imode();
+	return (enum sgi_mach) 0;
+}
+
+static int string_to_cpu(char *s)
+{
+	int i;
+
+	for(i = 0; i < NUM_CPUS; i++) {
+		if(!strcmp(s, sgi_cputable[i].name))
+			return sgi_mtable[i].type;
+	}
+	prom_printf("\nYeee, could not determine MIPS cpu type <%s>\n", s);
+	prom_printf("press a key to reboot\n");
+	prom_getchar();
+	romvec->imode();
+	return 0;
+}
+
+void sgi_sysinit(void)
+{
+	pcomponent *p, *toplev, *cpup = 0;
+	int cputype = -1;
+
+
+	/* The root component tells us what machine architecture we
+	 * have here.
+	 */
+	p = prom_getchild(PROM_NULL_COMPONENT);
+	printk("ARCH: %s\n", p->iname);
+	sgimach = string_to_mach(p->iname);
+
+	/* Now scan for cpu(s). */
+	toplev = p = prom_getchild(p);
+	while(p) {
+		int ncpus = 0;
+
+		if(p->type == Cpu) {
+			if(++ncpus > 1) {
+				prom_printf("\nYeee, SGI MP not ready yet\n");
+				prom_printf("press a key to reboot\n");
+				prom_getchar();
+				romvec->imode();
+			}
+			printk("CPU: %s ", p->iname);
+			cpup = p;
+			cputype = string_to_cpu(cpup->iname);
+		}
+		p = prom_getsibling(p);
+	}
+	if(cputype == -1) {
+		prom_printf("\nYeee, could not find cpu ARCS component\n");
+		prom_printf("press a key to reboot\n");
+		prom_getchar();
+		romvec->imode();
+	}
+	p = prom_getchild(cpup);
+	while(p) {
+		switch(p->class) {
+		case processor:
+			switch(p->type) {
+			case Fpu:
+				printk("FPU<%s> ", p->iname);
+				break;
+
+			default:
+				break;
+			};
+			break;
+
+		case cache:
+			switch(p->type) {
+			case picache:
+				printk("ICACHE ");
+				break;
+
+			case pdcache:
+				printk("DCACHE ");
+				break;
+
+			case sccache:
+				printk("SCACHE ");
+				break;
+
+			default:
+				break;
+
+			};
+			break;
+
+		default:
+			break;
+		};
+		p = prom_getsibling(p);
+	}
+	printk("\n");
+}
diff --git a/arch/mips/sgi/kernel/time.c b/arch/mips/sgi/kernel/time.c
new file mode 100644
index 000000000..1f5137c27
--- /dev/null
+++ b/arch/mips/sgi/kernel/time.c
@@ -0,0 +1,14 @@
+/* $Id: time.c,v 1.1 1996/06/08 12:07:08 dm Exp $
+ * time.c: Generic SGI time_init() code, this will dispatch to the
+ *         appropriate per-architecture time/counter init code.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+extern void indy_timer_init(void);
+
+void time_init(void)
+{
+	/* XXX assume INDY for now XXX */
+	indy_timer_init();
+}
diff --git a/arch/mips/sgi/prom/.cvsignore b/arch/mips/sgi/prom/.cvsignore
new file mode 100644
index 000000000..4671378ae
--- /dev/null
+++ b/arch/mips/sgi/prom/.cvsignore
@@ -0,0 +1 @@
+.depend
diff --git a/arch/mips/sgi/prom/Makefile b/arch/mips/sgi/prom/Makefile
new file mode 100644
index 000000000..8dbfedf80
--- /dev/null
+++ b/arch/mips/sgi/prom/Makefile
@@ -0,0 +1,23 @@
+# $Id: Makefile,v 1.6 1996/06/08 04:48:41 dm Exp $
+# Makefile for the SGI arcs prom monitor library routines
+# under Linux.
+#
+# Note! Dependencies are done automagically by 'make dep', which also
+# removes any old dependencies. DON'T put your own dependencies here
+# unless it's something special (ie not a .c file).
+#
+# Note 2! The CFLAGS definitions are now in the main makefile...
+
+OBJS  = console.o init.o printf.o memory.o tree.o tags.o env.o \
+      cmdline.o misc.o time.o file.o
+
+all: promlib.a
+
+promlib.a: $(OBJS)
+	$(AR) rcs promlib.a $(OBJS)
+	sync
+
+dep:
+	$(CPP) -M *.c > .depend
+
+include $(TOPDIR)/Rules.make
diff --git a/arch/mips/sgi/prom/cmdline.c b/arch/mips/sgi/prom/cmdline.c
new file mode 100644
index 000000000..4c7da5e43
--- /dev/null
+++ b/arch/mips/sgi/prom/cmdline.c
@@ -0,0 +1,60 @@
+/* $Id: cmdline.c,v 1.1 1996/06/08 03:23:10 dm Exp $
+ * cmdline.c: Kernel command line creation using ARCS argc/argv.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+#include <asm/sgialib.h>
+#include <asm/bootinfo.h>
+
+/* #define DEBUG_CMDLINE */
+
+extern char arcs_cmdline[CL_SIZE];
+
+char *prom_getcmdline(void)
+{
+	return &(arcs_cmdline[0]);
+}
+
+static char *ignored[] = {
+	"ConsoleIn=",
+	"ConsoleOut=",
+	"SystemPartition=",
+	"OSLoader=",
+	"OSLoadPartition=",
+	"OSLoadFilename="
+};
+#define NENTS(foo) ((sizeof((foo)) / (sizeof((foo[0])))))
+
+void prom_init_cmdline(void)
+{
+	char *cp;
+	int actr, i;
+
+	actr = 1; /* Always ignore argv[0] */
+
+	cp = &(arcs_cmdline[0]);
+	while(actr < prom_argc) {
+		for(i = 0; i < NENTS(ignored); i++) {
+			int len = strlen(ignored[i]);
+
+			if(!strncmp(prom_argv[actr], ignored[i], len))
+				goto pic_cont;
+		}
+		/* Ok, we want it. */
+		strcpy(cp, prom_argv[actr]);
+		cp += strlen(prom_argv[actr]);
+		*cp++ = ' ';
+
+	pic_cont:
+		actr++;
+	}
+	*cp = '\0';
+
+#ifdef DEBUG_CMDLINE
+	prom_printf("prom_init_cmdline: %s\n", &(arcs_cmdline[0]));
+#endif
+}
diff --git a/arch/mips/sgi/prom/console.c b/arch/mips/sgi/prom/console.c
new file mode 100644
index 000000000..3f4d69f45
--- /dev/null
+++ b/arch/mips/sgi/prom/console.c
@@ -0,0 +1,24 @@
+/* $Id: console.c,v 1.1 1996/06/04 00:57:05 dm Exp $
+ * console.c: SGI arcs console code.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@sgi.com)
+ */
+
+#include <asm/sgialib.h>
+
+void prom_putchar(char c)
+{
+	long cnt;
+	char it = c;
+
+	romvec->write(1, &it, 1, &cnt);
+}
+
+char prom_getchar(void)
+{
+	long cnt;
+	char c;
+
+	romvec->read(0, &c, 1, &cnt);
+	return c;
+}
diff --git a/arch/mips/sgi/prom/env.c b/arch/mips/sgi/prom/env.c
new file mode 100644
index 000000000..5aff47efd
--- /dev/null
+++ b/arch/mips/sgi/prom/env.c
@@ -0,0 +1,20 @@
+/* $Id: env.c,v 1.2 1996/06/08 04:48:41 dm Exp $
+ * env.c: ARCS environment variable routines.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+#include <asm/sgialib.h>
+
+char *prom_getenv(char *name)
+{
+	return romvec->get_evar(name);
+}
+
+long prom_setenv(char *name, char *value)
+{
+	return romvec->set_evar(name, value);
+}
diff --git a/arch/mips/sgi/prom/file.c b/arch/mips/sgi/prom/file.c
new file mode 100644
index 000000000..b62d33dda
--- /dev/null
+++ b/arch/mips/sgi/prom/file.c
@@ -0,0 +1,58 @@
+/* $Id: file.c,v 1.1 1996/06/08 04:47:22 dm Exp $
+ * file.c: ARCS firmware interface to files.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <asm/sgialib.h>
+
+long prom_getvdirent(unsigned long fd, struct linux_vdirent *ent, unsigned long num,
+		     unsigned long *cnt)
+{
+	return romvec->get_vdirent(fd, ent, num, cnt);
+}
+
+long prom_open(char *name, enum linux_omode md, unsigned long *fd)
+{
+	return romvec->open(name, md, fd);
+}
+
+long prom_close(unsigned long fd)
+{
+	return romvec->close(fd);
+}
+
+long prom_read(unsigned long fd, void *buf, unsigned long num, unsigned long *cnt)
+{
+	return romvec->read(fd, buf, num, cnt);
+}
+
+long prom_getrstatus(unsigned long fd)
+{
+	return romvec->get_rstatus(fd);
+}
+
+long prom_write(unsigned long fd, void *buf, unsigned long num, unsigned long *cnt)
+{
+	return romvec->write(fd, buf, num, cnt);
+}
+
+long prom_seek(unsigned long fd, struct linux_bigint *off, enum linux_seekmode sm)
+{
+	return romvec->seek(fd, off, sm);
+}
+
+long prom_mount(char *name, enum linux_mountops op)
+{
+	return romvec->mount(name, op);
+}
+
+long prom_getfinfo(unsigned long fd, struct linux_finfo *buf)
+{
+	return romvec->get_finfo(fd, buf);
+}
+
+long prom_setfinfo(unsigned long fd, unsigned long flags, unsigned long msk)
+{
+	return romvec->set_finfo(fd, flags, msk);
+}
diff --git a/arch/mips/sgi/prom/init.c b/arch/mips/sgi/prom/init.c
new file mode 100644
index 000000000..6b6167efd
--- /dev/null
+++ b/arch/mips/sgi/prom/init.c
@@ -0,0 +1,59 @@
+/* $Id: init.c,v 1.6 1996/06/10 16:38:33 dm Exp $
+ * init.c: PROM library initialisation code.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <linux/kernel.h>
+
+#include <asm/sgialib.h>
+
+/* #define DEBUG_PROM_INIT */
+
+/* Master romvec interface. */
+struct linux_romvec *romvec;
+struct linux_promblock *sgi_pblock;
+int prom_argc;
+char **prom_argv, **prom_envp;
+unsigned short prom_vers, prom_rev;
+
+extern void prom_testtree(void);
+
+int prom_init(int argc, char **argv, char **envp)
+{
+	struct linux_promblock *pb;
+
+	romvec = ROMVECTOR;
+	pb = sgi_pblock = PROMBLOCK;
+	prom_argc = argc;
+	prom_argv = argv;
+	prom_envp = envp;
+
+	if(pb->magic != 0x53435241) {
+		prom_printf("Aieee, bad prom vector magic %08lx\n", pb->magic);
+		while(1)
+			;
+	}
+
+	prom_init_cmdline();
+
+	prom_vers = pb->ver;
+	prom_rev = pb->rev;
+	printk("PROMLIB: SGI ARCS firmware Version %d Revision %d\n",
+		    prom_vers, prom_rev);
+	prom_meminit();
+	prom_setup_archtags();
+
+#if 0
+	prom_testtree();
+#endif
+
+#ifdef DEBUG_PROM_INIT
+	{
+		prom_printf("Press a key to reboot\n");
+		(void) prom_getchar();
+		romvec->imode();
+	}
+#endif
+	return 0;
+}
diff --git a/arch/mips/sgi/prom/memory.c b/arch/mips/sgi/prom/memory.c
new file mode 100644
index 000000000..cb392a805
--- /dev/null
+++ b/arch/mips/sgi/prom/memory.c
@@ -0,0 +1,129 @@
+/* $Id: memory.c,v 1.5 1996/06/10 16:38:33 dm Exp $
+ * memory.c: PROM library functions for acquiring/using memory descriptors
+ *           given to us from the ARCS firmware.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+
+#include <asm/sgialib.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/bootinfo.h>
+
+/* #define DEBUG */
+
+struct linux_mdesc *prom_getmdesc(struct linux_mdesc *curr)
+{
+	return romvec->get_mdesc(curr);
+}
+
+#ifdef DEBUG /* convenient for debugging */
+static char *mtypes[8] = {
+	"Exception Block",
+	"ARCS Romvec Page",
+	"Free/Contig RAM",
+	"Generic Free RAM",
+	"Bad Memory",
+	"Standlong Program Pages",
+	"ARCS Temp Storage Area",
+	"ARCS Permanent Storage Area"
+};
+#endif
+
+static struct prom_pmemblock prom_pblocks[PROM_MAX_PMEMBLOCKS];
+
+struct prom_pmemblock *prom_getpblock_array(void)
+{
+	return &prom_pblocks[0];
+}
+
+static void prom_setup_memupper(void)
+{
+	struct prom_pmemblock *p, *highest;
+
+	for(p = prom_getpblock_array(), highest = 0; p->size != 0; p++) {
+		if(p->base == 0xdeadbeef)
+			prom_printf("WHEEE, bogus pmemblock\n");
+		if(!highest || p->base > highest->base)
+			highest = p;
+	}
+	mips_memory_upper = highest->base + highest->size;
+#ifdef DEBUG
+	prom_printf("prom_setup_memupper: mips_memory_upper = %08lx\n",
+		    mips_memory_upper);
+#endif
+}
+
+void prom_meminit(void)
+{
+	struct linux_mdesc *p;
+	int totram;
+	int i = 0;
+
+	p = prom_getmdesc(PROM_NULL_MDESC);
+#ifdef DEBUG
+	prom_printf("ARCS MEMORY DESCRIPTOR dump:\n");
+	while(p) {
+		prom_printf("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
+			    i, p, p->base, p->pages, mtypes[p->type]);
+		p = prom_getmdesc(p);
+		i++;
+	}
+#endif
+	p = prom_getmdesc(PROM_NULL_MDESC);
+	totram = 0;
+	i = 0;
+	while(p) {
+		if(p->type == free || p->type == fcontig) {
+			prom_pblocks[i].base =
+				((p->base<<PAGE_SHIFT) + 0x80000000);
+			prom_pblocks[i].size = p->pages << PAGE_SHIFT;
+			totram += prom_pblocks[i].size;
+#ifdef DEBUG
+			prom_printf("free_chunk[%d]: base=%08lx size=%d\n",
+				    i, prom_pblocks[i].base,
+				    prom_pblocks[i].size);
+#endif
+			i++;
+		}
+		p = prom_getmdesc(p);
+	}
+	prom_pblocks[i].base = 0xdeadbeef;
+	prom_pblocks[i].size = 0; /* indicates last elem. of array */
+	printk("PROMLIB: Total free ram %d bytes (%dK,%dMB)\n",
+		    totram, (totram/1024), (totram/1024/1024));
+
+	/* Setup upper physical memory bound. */
+	prom_setup_memupper();
+}
+
+/* Called from mem_init() to fixup the mem_map page settings. */
+void prom_fixup_mem_map(unsigned long start, unsigned long end)
+{
+	struct prom_pmemblock *p;
+	int i, nents;
+
+	/* Determine number of pblockarray entries. */
+	p = prom_getpblock_array();
+	for(i = 0; p[i].size; i++)
+		;
+	nents = i;
+	while(start < end) {
+		for(i = 0; i < nents; i++) {
+			if((start >= (p[i].base)) &&
+			   (start < (p[i].base + p[i].size))) {
+				start = p[i].base + p[i].size;
+				start &= PAGE_MASK;
+				continue;
+			}
+		}
+		set_bit(PG_reserved, &mem_map[MAP_NR(start)].flags);
+		start += PAGE_SIZE;
+	}
+}
diff --git a/arch/mips/sgi/prom/misc.c b/arch/mips/sgi/prom/misc.c
new file mode 100644
index 000000000..47051a1b3
--- /dev/null
+++ b/arch/mips/sgi/prom/misc.c
@@ -0,0 +1,109 @@
+/* $Id: misc.c,v 1.3 1996/08/07 02:54:12 dm Exp $
+ * misc.c: Miscellaneous ARCS PROM routines.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <linux/kernel.h>
+
+#include <asm/sgialib.h>
+#include <asm/bootinfo.h>
+#include <asm/system.h>
+
+extern unsigned long mips_cputype;
+extern int initialize_kbd(void);
+extern void *sgiwd93_host;
+extern void reset_wd33c93(void *instance);
+
+static inline void shutoff_r4600_cache(void)
+{
+	unsigned long tmp1, tmp2, tmp3;
+
+	if(mips_cputype != CPU_R4600 &&
+	   mips_cputype != CPU_R4640 &&
+	   mips_cputype != CPU_R4700)
+		return;
+	printk("Disabling R4600 SCACHE\n");
+	__asm__ __volatile__("
+	.set noreorder
+	.set mips3
+	li	%0, 0x1
+	dsll	%0, 31
+	lui	%1, 0x9000
+	dsll32	%1, 0
+	or	%0, %1, %0
+	mfc0	%2, $12
+	nop; nop; nop; nop;
+	li	%1, 0x80
+	mtc0	%1, $12
+	nop; nop; nop; nop;
+	sh	$0, 0(%0)
+	mtc0	$0, $12
+	nop; nop; nop; nop;
+	mtc0	%2, $12
+	nop; nop; nop; nop;
+	.set mips2
+	.set reorder
+        " : "=r" (tmp1), "=r" (tmp2), "=r" (tmp3));
+}
+
+void prom_halt(void)
+{
+	shutoff_r4600_cache();
+	initialize_kbd();
+	reset_wd33c93(sgiwd93_host);
+	cli();
+	romvec->halt();
+}
+
+void prom_powerdown(void)
+{
+	shutoff_r4600_cache();
+	initialize_kbd();
+	reset_wd33c93(sgiwd93_host);
+	cli();
+	romvec->pdown();
+}
+
+/* XXX is this a soft reset basically? XXX */
+void prom_restart(void)
+{
+	shutoff_r4600_cache();
+	initialize_kbd();
+	reset_wd33c93(sgiwd93_host);
+	cli();
+	romvec->restart();
+}
+
+void prom_reboot(void)
+{
+	shutoff_r4600_cache();
+	initialize_kbd();
+	reset_wd33c93(sgiwd93_host);
+	cli();
+	romvec->reboot();
+}
+
+void prom_imode(void)
+{
+	shutoff_r4600_cache();
+	initialize_kbd();
+	reset_wd33c93(sgiwd93_host);
+	cli();
+	romvec->imode();
+}
+
+long prom_cfgsave(void)
+{
+	return romvec->cfg_save();
+}
+
+struct linux_sysid *prom_getsysid(void)
+{
+	return romvec->get_sysid();
+}
+
+void prom_cacheflush(void)
+{
+	romvec->cache_flush();
+}
diff --git a/arch/mips/sgi/prom/printf.c b/arch/mips/sgi/prom/printf.c
new file mode 100644
index 000000000..02e7e4734
--- /dev/null
+++ b/arch/mips/sgi/prom/printf.c
@@ -0,0 +1,34 @@
+/* $Id: printf.c,v 1.1 1996/06/04 00:57:06 dm Exp $
+ * printf.c: Putting things on the screen using SGI arcs
+ *           PROM facilities.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@sgi.com)
+ */
+
+#include <linux/kernel.h>
+
+#include <asm/sgialib.h>
+
+static char ppbuf[1024];
+
+void
+prom_printf(char *fmt, ...)
+{
+	va_list args;
+	char ch, *bptr;
+	int i;
+
+	va_start(args, fmt);
+	i = vsprintf(ppbuf, fmt, args);
+
+	bptr = ppbuf;
+
+	while((ch = *(bptr++)) != 0) {
+		if(ch == '\n')
+			prom_putchar('\r');
+
+		prom_putchar(ch);
+	}
+	va_end(args);
+	return;
+}
diff --git a/arch/mips/sgi/prom/salone.c b/arch/mips/sgi/prom/salone.c
new file mode 100644
index 000000000..4f120af3a
--- /dev/null
+++ b/arch/mips/sgi/prom/salone.c
@@ -0,0 +1,24 @@
+/* $Id: salone.c,v 1.1 1996/06/08 04:47:22 dm Exp $
+ * salone.c: Routines to load into memory and execute stand-along
+ *           program images using ARCS PROM firmware.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <asm/sgialib.h>
+
+long prom_load(char *name, unsigned long end, unsigned long *pc, unsigned long *eaddr)
+{
+	return romvec->load(name, end, pc, eaddr);
+}
+
+long prom_invoke(unsigned long pc, unsigned long sp, long argc,
+		 char **argv, char **envp)
+{
+	return romvec->invoke(pc, sp, argc, argv, envp);
+}
+
+long prom_exec(char *name, long argc, char **argv, char **envp)
+{
+	return romvec->exec(name, argc, argv, envp);
+}
diff --git a/arch/mips/sgi/prom/tags.c b/arch/mips/sgi/prom/tags.c
new file mode 100644
index 000000000..4a9fe0b2b
--- /dev/null
+++ b/arch/mips/sgi/prom/tags.c
@@ -0,0 +1,67 @@
+/* $Id: tags.c,v 1.5 1996/06/24 07:12:22 dm Exp $
+ * tags.c: Initialize the arch tags the way the MIPS kernel setup
+ *         expects.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+#include <asm/segment.h>
+#include <asm/sgialib.h>
+#include <asm/bootinfo.h>
+#include <asm/sgimc.h>
+
+/* XXX This tag thing is a fucking rats nest, I'm very inclined to completely
+ * XXX rework the MIPS people's multi-arch code _NOW_.
+ */
+
+static unsigned long machtype_SGI_INDY = MACH_SGI_INDY;
+static unsigned long machgroup_SGI = MACH_GROUP_SGI;
+static unsigned long memlower_SGI_INDY = (KSEG0 + SGIMC_SEG0_BADDR);
+static unsigned long cputype_SGI_INDY = CPU_R4400SC;
+static unsigned long tlb_entries_SGI_INDY = 48;
+static unsigned long dummy_SGI_INDY = 0;
+static struct drive_info_struct dummy_dinfo_SGI_INDY = { { 0, }, };
+char arcs_cmdline[CL_SIZE];
+
+#define TAG(t,l)   {tag_##t,(l)} /* XXX RATS NEST CODE!!! XXX */
+#define TAGVAL(v)  (void*)&(v)   /* XXX FUCKING LOSING!!! XXX */
+
+tag_def taglist_sgi_indy[] = {
+	{TAG(machtype, ULONGSIZE), TAGVAL(machtype_SGI_INDY)},
+	{TAG(machgroup, ULONGSIZE), TAGVAL(machgroup_SGI)},
+	{TAG(memlower, ULONGSIZE), TAGVAL(memlower_SGI_INDY)},
+	{TAG(cputype, ULONGSIZE), TAGVAL(cputype_SGI_INDY)},
+	{TAG(tlb_entries, ULONGSIZE), TAGVAL(tlb_entries_SGI_INDY)},
+	{TAG(vram_base, ULONGSIZE), TAGVAL(dummy_SGI_INDY)},
+	{TAG(drive_info, DRVINFOSIZE), TAGVAL(dummy_dinfo_SGI_INDY)},
+	{TAG(mount_root_rdonly, ULONGSIZE), TAGVAL(dummy_SGI_INDY)},
+	{TAG(command_line, CL_SIZE), TAGVAL(arcs_cmdline[0])},
+	{TAG(dummy, 0), NULL}
+	/* XXX COLOSTOMY BAG!!!! XXX */
+};
+
+void prom_setup_archtags(void)
+{
+	tag_def *tdp = &taglist_sgi_indy[0];
+	tag *tp;
+
+	tp = (tag *) (mips_memory_upper - sizeof(tag));
+	while(tdp->t.tag != tag_dummy) {
+		unsigned long size;
+		char *d;
+
+		*tp = tdp->t;
+		size = tp->size;
+		d = (char *) tdp->d;
+		tp = (tag *)(((unsigned long)tp) - (tp->size));
+		if(size)
+			memcpy(tp, d, size);
+
+		tp--;
+		tdp++;
+	}
+	*tp = tdp->t; /* copy last dummy element over */
+}
diff --git a/arch/mips/sgi/prom/time.c b/arch/mips/sgi/prom/time.c
new file mode 100644
index 000000000..9a836b810
--- /dev/null
+++ b/arch/mips/sgi/prom/time.c
@@ -0,0 +1,17 @@
+/* $Id: time.c,v 1.1 1996/06/08 04:47:23 dm Exp $
+ * time.c: Extracting time information from ARCS prom.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <asm/sgialib.h>
+
+struct linux_tinfo *prom_gettinfo(void)
+{
+	return romvec->get_tinfo();
+}
+
+unsigned long prom_getrtime(void)
+{
+	return romvec->get_rtime();
+}
diff --git a/arch/mips/sgi/prom/tree.c b/arch/mips/sgi/prom/tree.c
new file mode 100644
index 000000000..1cefd4964
--- /dev/null
+++ b/arch/mips/sgi/prom/tree.c
@@ -0,0 +1,107 @@
+/* $Id: tree.c,v 1.4 1996/06/08 04:48:41 dm Exp $
+ * tree.c: PROM component device tree code.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <asm/sgialib.h>
+
+#define DEBUG_PROM_TREE
+
+pcomponent *prom_getsibling(pcomponent *this)
+{
+	if(this == PROM_NULL_COMPONENT)
+		return PROM_NULL_COMPONENT;
+	return romvec->next_component(this);
+}
+
+pcomponent *prom_getchild(pcomponent *this)
+{
+	return romvec->child_component(this);
+}
+
+pcomponent *prom_getparent(pcomponent *child)
+{
+	if(child == PROM_NULL_COMPONENT)
+		return PROM_NULL_COMPONENT;
+	return romvec->parent_component(child);
+}
+
+long prom_getcdata(void *buffer, pcomponent *this)
+{
+	return romvec->component_data(buffer, this);
+}
+
+pcomponent *prom_childadd(pcomponent *this, pcomponent *tmp, void *data)
+{
+	return romvec->child_add(this, tmp, data);
+}
+
+long prom_delcomponent(pcomponent *this)
+{
+	return romvec->comp_del(this);
+}
+
+pcomponent *prom_componentbypath(char *path)
+{
+	return romvec->component_by_path(path);
+}
+
+#ifdef DEBUG_PROM_TREE
+static char *classes[] = {
+	"system", "processor", "cache", "adapter", "controller", "peripheral",
+	"memory"
+};
+
+static char *types[] = {
+	"arc", "cpu", "fpu", "picache", "pdcache", "sicache", "sdcache", "sccache",
+	"memdev", "eisa adapter", "tc adapter", "scsi adapter", "dti adapter",
+	"multi-func adapter", "disk controller", "tp controller",
+	"cdrom controller", "worm controller", "serial controller",
+	"net controller", "display controller", "parallel controller",
+	"pointer controller", "keyboard controller", "audio controller",
+	"misc controller", "disk peripheral", "floppy peripheral",
+	"tp peripheral", "modem peripheral", "monitor peripheral",
+	"printer peripheral", "pointer peripheral", "keyboard peripheral",
+	"terminal peripheral", "line peripheral", "net peripheral",
+	"misc peripheral", "anonymous"
+};
+
+static char *iflags[] = {
+	"bogus", "read only", "removable", "console in", "console out",
+	"input", "output"
+};
+
+static void dump_component(pcomponent *p)
+{
+	prom_printf("[%p]:class<%s>type<%s>flags<%s>ver<%d>rev<%d>",
+		    p, classes[p->class], types[p->type],
+		    iflags[p->iflags], p->vers, p->rev);
+	prom_printf("key<%08lx>\n\tamask<%08lx>cdsize<%d>ilen<%d>iname<%s>\n",
+		    p->key, p->amask, (int)p->cdsize, (int)p->ilen, p->iname);
+}
+
+static void traverse(pcomponent *p, int op)
+{
+	dump_component(p);
+	if(prom_getchild(p))
+		traverse(prom_getchild(p), 1);
+	if(prom_getsibling(p) && op)
+		traverse(prom_getsibling(p), 1);
+}
+
+void prom_testtree(void)
+{
+	pcomponent *p;
+
+	p = prom_getchild(PROM_NULL_COMPONENT);
+	dump_component(p);
+	p = prom_getchild(p);
+	while(p) {
+		dump_component(p);
+		p = prom_getsibling(p);
+	}
+	prom_printf("press a key\n");
+	prom_getchar();
+}
+#endif