More MIPS64 chainsawing.

14 files changed, 849 insertions, 0 deletions

diff --git a/arch/mips64/arc/.cvsignore b/arch/mips64/arc/.cvsignore
new file mode 100644
index 000000000..857dd22e9
--- /dev/null
+++ b/arch/mips64/arc/.cvsignore
@@ -0,0 +1,2 @@
+.depend
+.*.flags
diff --git a/arch/mips64/arc/Makefile b/arch/mips64/arc/Makefile
new file mode 100644
index 000000000..86a5ad8f2
--- /dev/null
+++ b/arch/mips64/arc/Makefile
@@ -0,0 +1,23 @@
+# $Id$
+# 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 env.o \
+      cmdline.o misc.o time.o file.o identify.o
+
+all: arclib.a
+
+arclib.a: $(OBJS)
+	$(AR) rcs arclib.a $(OBJS)
+	sync
+
+dep:
+	$(CPP) -M *.c > .depend
+
+include $(TOPDIR)/Rules.make
diff --git a/arch/mips64/arc/cmdline.c b/arch/mips64/arc/cmdline.c
new file mode 100644
index 000000000..7e58e8f7e
--- /dev/null
+++ b/arch/mips64/arc/cmdline.c
@@ -0,0 +1,67 @@
+/* $Id$
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * cmdline.c: Kernel command line creation using ARCS argc/argv.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+#include <asm/sgialib.h>
+#include <asm/bootinfo.h>
+
+/* #define DEBUG_CMDLINE */
+
+char arcs_cmdline[CL_SIZE];
+
+char * __init 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 __init 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++;
+	}
+	if (cp != &(arcs_cmdline[0])) /* get rid of trailing space */
+		--cp;
+	*cp = '\0';
+
+#ifdef DEBUG_CMDLINE
+	prom_printf("prom_init_cmdline: %s\n", &(arcs_cmdline[0]));
+#endif
+}
diff --git a/arch/mips64/arc/console.c b/arch/mips64/arc/console.c
new file mode 100644
index 000000000..f16d2a766
--- /dev/null
+++ b/arch/mips64/arc/console.c
@@ -0,0 +1,29 @@
+/* $Id$
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * console.c: SGI arcs console code.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@sgi.com)
+ */
+#include <linux/init.h>
+#include <asm/sgialib.h>
+
+void __init prom_putchar(char c)
+{
+	long cnt;
+	char it = c;
+
+	romvec->write(1, &it, 1, &cnt);
+}
+
+char __init prom_getchar(void)
+{
+	long cnt;
+	char c;
+
+	romvec->read(0, &c, 1, &cnt);
+	return c;
+}
diff --git a/arch/mips64/arc/env.c b/arch/mips64/arc/env.c
new file mode 100644
index 000000000..55a250047
--- /dev/null
+++ b/arch/mips64/arc/env.c
@@ -0,0 +1,25 @@
+/* $Id$
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * env.c: ARCS environment variable routines.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+#include <asm/sgialib.h>
+
+char * __init prom_getenv(char *name)
+{
+	return romvec->get_evar(name);
+}
+
+long __init prom_setenv(char *name, char *value)
+{
+	return romvec->set_evar(name, value);
+}
diff --git a/arch/mips64/arc/file.c b/arch/mips64/arc/file.c
new file mode 100644
index 000000000..f609e7846
--- /dev/null
+++ b/arch/mips64/arc/file.c
@@ -0,0 +1,68 @@
+/* $Id$
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * ARC firmware interface.
+ *
+ * Copyright (C) 1994, 1995, 1996, 1999 Ralf Baechle
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ */
+#include <linux/init.h>
+#include <asm/sgialib.h>
+
+long __init prom_getvdirent(unsigned long fd, struct linux_vdirent *ent,
+                            unsigned long num, unsigned long *cnt)
+{
+	return ARC_CALL4(get_vdirent, fd, ent, num, cnt);
+}
+
+long __init prom_open(char *name, enum linux_omode md, unsigned long *fd)
+{
+	return ARC_CALL3(open, name, md, fd);
+}
+
+long __init prom_close(unsigned long fd)
+{
+	return ARC_CALL1(close, fd);
+}
+
+long __init prom_read(unsigned long fd, void *buf, unsigned long num,
+                      unsigned long *cnt)
+{
+	return ARC_CALL4(read, fd, buf, num, cnt);
+}
+
+long __init prom_getrstatus(unsigned long fd)
+{
+	return ARC_CALL1(get_rstatus, fd);
+}
+
+long __init prom_write(unsigned long fd, void *buf, unsigned long num,
+                       unsigned long *cnt)
+{
+	return ARC_CALL4(write, fd, buf, num, cnt);
+}
+
+long __init prom_seek(unsigned long fd, struct linux_bigint *off,
+                      enum linux_seekmode sm)
+{
+	return ARC_CALL3(seek, fd, off, sm);
+}
+
+long __init prom_mount(char *name, enum linux_mountops op)
+{
+	return ARC_CALL2(mount, name, op);
+}
+
+long __init prom_getfinfo(unsigned long fd, struct linux_finfo *buf)
+{
+	return ARC_CALL2(get_finfo, fd, buf);
+}
+
+long __init prom_setfinfo(unsigned long fd, unsigned long flags,
+                          unsigned long msk)
+{
+	return ARC_CALL3(set_finfo, fd, flags, msk);
+}
diff --git a/arch/mips64/arc/identify.c b/arch/mips64/arc/identify.c
new file mode 100644
index 000000000..c2a6809be
--- /dev/null
+++ b/arch/mips64/arc/identify.c
@@ -0,0 +1,71 @@
+/* $Id$
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * identify.c: identify machine by looking up system identifier
+ *
+ * Copyright (C) 1998 Thomas Bogendoerfer
+ * 
+ * This code is based on arch/mips/sgi/kernel/system.c, which is
+ * 
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/string.h>
+
+#include <asm/sgi/sgi.h>
+#include <asm/sgialib.h>
+#include <asm/bootinfo.h>
+
+struct smatch {
+    char *name;
+    int group;
+    int type;
+    int flags;
+};
+
+static struct smatch mach_table[] = {
+    { "SGI-IP22", MACH_GROUP_SGI, MACH_SGI_INDY, PROM_FLAG_ARCS },
+    { "Microsoft-Jazz", MACH_GROUP_JAZZ, MACH_MIPS_MAGNUM_4000, 0 },
+    { "PICA-61", MACH_GROUP_JAZZ, MACH_ACER_PICA_61, 0 },
+    { "RM200PCI", MACH_GROUP_SNI_RM, MACH_SNI_RM200_PCI, 0 }
+};
+
+int prom_flags;
+
+static struct smatch * __init string_to_mach(char *s)
+{
+    int i;
+    
+    for (i = 0; i < sizeof (mach_table); i++) {
+	if(!strcmp(s, mach_table[i].name))
+	    return &mach_table[i];
+    }
+    prom_printf("\nYeee, could not determine architecture type <%s>\n", s);
+    prom_printf("press a key to reboot\n");
+    prom_getchar();
+    romvec->imode();
+    return NULL;
+}
+
+void __init prom_identify_arch(void)
+{
+    pcomponent *p;
+    struct smatch *mach;
+    
+    /* The root component tells us what machine architecture we
+     * have here.
+     */
+    p = prom_getchild(PROM_NULL_COMPONENT);
+    printk("ARCH: %s\n", p->iname);
+    mach = string_to_mach(p->iname);
+
+    mips_machgroup = mach->group;
+    mips_machtype = mach->type;
+    prom_flags = mach->flags;
+}
+
diff --git a/arch/mips64/arc/init.c b/arch/mips64/arc/init.c
new file mode 100644
index 000000000..a94f7da27
--- /dev/null
+++ b/arch/mips64/arc/init.c
@@ -0,0 +1,61 @@
+/* $Id$
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * PROM library initialisation code.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/config.h>
+
+#include <asm/sgialib.h>
+
+#undef 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 __init 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;
+	prom_identify_arch();
+	printk("PROMLIB: ARC firmware Version %d Revision %d\n",
+		    prom_vers, prom_rev);
+	prom_meminit();
+
+#ifdef DEBUG_PROM_INIT
+	{
+		prom_printf("Press a key to reboot\n");
+		(void) prom_getchar();
+		romvec->imode();
+	}
+#endif
+	return 0;
+}
diff --git a/arch/mips64/arc/memory.c b/arch/mips64/arc/memory.c
new file mode 100644
index 000000000..7212b9e05
--- /dev/null
+++ b/arch/mips64/arc/memory.c
@@ -0,0 +1,212 @@
+/* $Id$
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/config.h>
+
+#include <asm/sgialib.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/bootinfo.h>
+
+#undef DEBUG
+
+struct linux_mdesc * __init prom_getmdesc(struct linux_mdesc *curr)
+{
+	return romvec->get_mdesc(curr);
+}
+
+#ifdef DEBUG
+static char *arcs_mtypes[8] = {	/* convenient for debugging */
+	"Exception Block",
+	"ARCS Romvec Page",
+	"Free/Contig RAM",
+	"Generic Free RAM",
+	"Bad Memory",
+	"Standlong Program Pages",
+	"ARCS Temp Storage Area",
+	"ARCS Permanent Storage Area"
+};
+
+static char *arc_mtypes[8] = {
+	"Exception Block",
+	"SystemParameterBlock",
+	"FreeMemory",
+	"Bad Memory",
+	"LoadedProgram",
+	"FirmwareTemporary",
+	"FirmwarePermanent",
+	"FreeContigiuous"
+};
+#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] : arc_mtypes[a.arc]
+#endif
+
+static struct prom_pmemblock prom_pblocks[PROM_MAX_PMEMBLOCKS];
+
+struct prom_pmemblock * __init prom_getpblock_array(void)
+{
+	return &prom_pblocks[0];
+}
+
+#define MEMTYPE_DONTUSE   0
+#define MEMTYPE_PROM      1
+#define MEMTYPE_FREE      2
+
+static int __init prom_memtype_classify (union linux_memtypes type)
+{
+    if (prom_flags & PROM_FLAG_ARCS) {
+	switch (type.arcs) {
+	 case arcs_free:
+	 case arcs_fcontig:
+	    return MEMTYPE_FREE;
+	 case arcs_atmp:
+	 case arcs_aperm:
+	    return MEMTYPE_PROM;
+	 default:
+	    return MEMTYPE_DONTUSE;
+	}
+    } else {
+	switch (type.arc) {
+	 case arc_free:
+	 case arc_fcontig:
+	    return MEMTYPE_FREE;
+	 case arc_rvpage:
+	 case arc_atmp:
+	 case arc_aperm:
+	    return MEMTYPE_PROM;
+	 default:
+	    return MEMTYPE_DONTUSE;
+	}
+    }
+}
+
+static void __init 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 __init 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) {
+	    prom_pblocks[i].type = prom_memtype_classify (p->type);
+	    prom_pblocks[i].base = ((p->base<<PAGE_SHIFT) + 0x80000000);
+	    prom_pblocks[i].size = p->pages << PAGE_SHIFT;
+	    switch (prom_pblocks[i].type) {
+	     case MEMTYPE_FREE:
+		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++;
+		break;
+	     case MEMTYPE_PROM:
+#ifdef DEBUG
+		prom_printf("prom_chunk[%d]: base=%08lx size=%d\n",
+			    i, prom_pblocks[i].base,
+			    prom_pblocks[i].size);
+#endif
+		i++;
+		break;
+	     default:
+		break;
+	    }
+	    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 __init 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;
+restart:
+	while(start < end) {
+		for(i = 0; i < nents; i++) {
+			if((p[i].type == MEMTYPE_FREE) &&
+			   (start >= (p[i].base)) &&
+			   (start < (p[i].base + p[i].size))) {
+				start = p[i].base + p[i].size;
+				start &= PAGE_MASK;
+				goto restart;
+			}
+		}
+		set_bit(PG_reserved, &mem_map[MAP_NR(start)].flags);
+		start += PAGE_SIZE;
+	}
+}
+
+void prom_free_prom_memory (void)
+{
+    struct prom_pmemblock *p;
+    unsigned long addr;
+    unsigned long num_pages = 0;
+
+    for(p = prom_getpblock_array(); p->size != 0; p++) {
+	if (p->type == MEMTYPE_PROM) {
+	    for (addr = p->base; addr < p->base + p->size; addr += PAGE_SIZE) {
+		mem_map[MAP_NR(addr)].flags &= ~(1 << PG_reserved);
+		atomic_set(&mem_map[MAP_NR(addr)].count, 1);
+		free_page(addr);
+		num_pages++;
+	    }
+	}
+    }
+    printk ("Freeing prom memory: %ldk freed\n", num_pages * PAGE_SIZE);
+}
diff --git a/arch/mips64/arc/misc.c b/arch/mips64/arc/misc.c
new file mode 100644
index 000000000..56945035e
--- /dev/null
+++ b/arch/mips64/arc/misc.c
@@ -0,0 +1,93 @@
+/* $Id$
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Miscellaneous ARCS PROM routines.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+#include <asm/bcache.h>
+#include <asm/sgialib.h>
+#include <asm/bootinfo.h>
+#include <asm/system.h>
+
+extern unsigned long mips_cputype;
+extern void *sgiwd93_host;
+extern void reset_wd33c93(void *instance);
+
+void prom_halt(void)
+{
+	bcops->bc_disable();
+	cli();
+#if CONFIG_SCSI_SGIWD93
+	reset_wd33c93(sgiwd93_host);
+#endif
+	ARC_CALL0(halt);
+never:	goto never;
+}
+
+void prom_powerdown(void)
+{
+	bcops->bc_disable();
+	cli();
+#if CONFIG_SCSI_SGIWD93
+	reset_wd33c93(sgiwd93_host);
+#endif
+	ARC_CALL0(pdown);
+never:	goto never;
+}
+
+/* XXX is this a soft reset basically? XXX */
+void prom_restart(void)
+{
+	bcops->bc_disable();
+	cli();
+#if CONFIG_SCSI_SGIWD93
+	reset_wd33c93(sgiwd93_host);
+#endif
+	ARC_CALL0(restart);
+never:	goto never;
+}
+
+void prom_reboot(void)
+{
+	bcops->bc_disable();
+	cli();
+#if CONFIG_SCSI_SGIWD93
+	reset_wd33c93(sgiwd93_host);
+#endif
+	ARC_CALL0(reboot);
+never:	goto never;
+}
+
+void prom_imode(void)
+{
+	bcops->bc_disable();
+	cli();
+#if CONFIG_SCSI_SGIWD93
+	reset_wd33c93(sgiwd93_host);
+#endif
+	ARC_CALL0(imode);
+never:	goto never;
+}
+
+long prom_cfgsave(void)
+{
+	return ARC_CALL0(cfg_save);
+}
+
+struct linux_sysid *prom_getsysid(void)
+{
+	return (struct linux_sysid *) ARC_CALL0(get_sysid);
+}
+
+void __init prom_cacheflush(void)
+{
+	ARC_CALL0(cache_flush);
+}
diff --git a/arch/mips64/arc/printf.c b/arch/mips64/arc/printf.c
new file mode 100644
index 000000000..ccefab0c7
--- /dev/null
+++ b/arch/mips64/arc/printf.c
@@ -0,0 +1,37 @@
+/* $Id$
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Putting things on the screen using SGI arcs PROM facilities.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@sgi.com)
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+#include <asm/sgialib.h>
+
+static char ppbuf[1024];
+
+void __init 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/mips64/arc/salone.c b/arch/mips64/arc/salone.c
new file mode 100644
index 000000000..0635c24a0
--- /dev/null
+++ b/arch/mips64/arc/salone.c
@@ -0,0 +1,26 @@
+/* $Id$
+ *
+ * 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 <linux/init.h>
+#include <asm/sgialib.h>
+
+long __init prom_load(char *name, unsigned long end, unsigned long *pc,
+                      unsigned long *eaddr)
+{
+	return romvec->load(name, end, pc, eaddr);
+}
+
+long __init prom_invoke(unsigned long pc, unsigned long sp, long argc,
+                        char **argv, char **envp))
+{
+	return romvec->invoke(pc, sp, argc, argv, envp);
+}
+
+long __init prom_exec(char *name, long argc, char **argv, char **envp)
+{
+	return romvec->exec(name, argc, argv, envp);
+}
diff --git a/arch/mips64/arc/time.c b/arch/mips64/arc/time.c
new file mode 100644
index 000000000..378db5331
--- /dev/null
+++ b/arch/mips64/arc/time.c
@@ -0,0 +1,22 @@
+/* $Id$
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Extracting time information from ARCS prom.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+#include <linux/init.h>
+#include <asm/sgialib.h>
+
+struct __init linux_tinfo *prom_gettinfo(void)
+{
+	return romvec->get_tinfo();
+}
+
+unsigned __init long prom_getrtime(void)
+{
+	return romvec->get_rtime();
+}
diff --git a/arch/mips64/arc/tree.c b/arch/mips64/arc/tree.c
new file mode 100644
index 000000000..12a88230b
--- /dev/null
+++ b/arch/mips64/arc/tree.c
@@ -0,0 +1,113 @@
+/* $Id$
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * PROM component device tree code.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+#include <linux/init.h>
+#include <asm/sgialib.h>
+
+#define DEBUG_PROM_TREE
+
+pcomponent * __init prom_getsibling(pcomponent *this)
+{
+	if(this == PROM_NULL_COMPONENT)
+		return PROM_NULL_COMPONENT;
+	return romvec->next_component(this);
+}
+
+pcomponent * __init prom_getchild(pcomponent *this)
+{
+	return romvec->child_component(this);
+}
+
+pcomponent * __init prom_getparent(pcomponent *child)
+{
+	if(child == PROM_NULL_COMPONENT)
+		return PROM_NULL_COMPONENT;
+	return romvec->parent_component(child);
+}
+
+long __init prom_getcdata(void *buffer, pcomponent *this)
+{
+	return romvec->component_data(buffer, this);
+}
+
+pcomponent * __init prom_childadd(pcomponent *this, pcomponent *tmp,
+                                  void *data)
+{
+	return romvec->child_add(this, tmp, data);
+}
+
+long __init prom_delcomponent(pcomponent *this)
+{
+	return romvec->comp_del(this);
+}
+
+pcomponent * __init 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 __init 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 __init 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 __init 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