The tlbwired register is now set up in the head.S code.

1 files changed, 115 insertions, 363 deletions

diff --git a/arch/mips64/kernel/head.S b/arch/mips64/kernel/head.S
index b2c006886..3e736acf7 100644
--- a/arch/mips64/kernel/head.S
+++ b/arch/mips64/kernel/head.S
@@ -1,388 +1,140 @@
-/* $Id: ip27-memory.c,v 1.2 2000/01/27 01:05:24 ralf Exp $
+/* $Id: head.S,v 1.6 2000/03/27 21:05:04 ulfc Exp $
  *
  * 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.
  *
- * Copyright (C) 2000 by Ralf Baechle
- * Copyright (C) 2000 by Silicon Graphics, Inc.
+ * Head.S contains the MIPS exception handler and startup code.
  *
- * On SGI IP27 the ARC memory configuration data is completly bogus but
- * alternate easier to use mechanisms are available.
+ * Copyright (C) 1994, 1995 Waldorf Electronics
+ * Written by Ralf Baechle and Andreas Busse
+ * Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999 Ralf Baechle
+ * Copyright (C) 1999 Silicon Graphics, Inc.
  */
-#include <linux/init.h>
+#define __ASSEMBLY__
 #include <linux/config.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/bootmem.h>
-#include <linux/swap.h>
-
-#include <asm/page.h>
-#include <asm/bootinfo.h>
-#include <asm/addrspace.h>
+#include <linux/init.h>
+#include <asm/asm.h>
+#include <asm/regdef.h>
+#include <asm/processor.h>
+#include <asm/mipsregs.h>
+#include <asm/stackframe.h>
 #include <asm/pgtable.h>
-#include <asm/sn/types.h>
-#include <asm/sn/addrs.h>
-#include <asm/sn/klconfig.h>
-#include <asm/sn/arch.h>
-#include <asm/mmzone.h>
 
-typedef unsigned long pfn_t;			/* into <asm/sn/types.h> */
-#define KDM_TO_PHYS(x)	((x) & TO_PHYS_MASK)	/* into asm/addrspace.h */
+	.text
 
-extern char _end;
+EXPORT(stext)					# used for profiling
+EXPORT(_stext)
 
-#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-#define SLOT_IGNORED	0xffff
+	__INIT
 
-short slot_lastfilled_cache[MAX_COMPACT_NODES];
-unsigned short slot_psize_cache[MAX_COMPACT_NODES][MAX_MEM_SLOTS];
-static pfn_t numpages;
-static pfn_t pagenr = 0;
+NESTED(kernel_entry, 16, sp)			# kernel entry point
 
-plat_pg_data_t *plat_node_data[MAX_COMPACT_NODES];
-bootmem_data_t plat_node_bdata[MAX_COMPACT_NODES];
+	ori	sp, 0xf				# align stack on 16 byte.
+	xori	sp, 0xf
 
-int numa_debug(void)
-{
-	printk("NUMA debug\n");
-	*(int *)0 = 0;
-	return(0);
-}
+	jal	mapped_kernel_setup_tlb
 
-/*
- * Return pfn of first free page of memory on a node. PROM may allocate
- * data structures on the first couple of pages of the first slot of each 
- * node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
- */
-pfn_t node_getfirstfree(cnodeid_t cnode)
-{
-	unsigned long loadbase = CKSEG0;
-	nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
-
-#ifdef CONFIG_MAPPED_KERNEL
-	loadbase = CKSSEG;
+#ifdef CONFIG_ARC64
+	la	t0, 1f
+	jr	t0
+1:
 #endif
-	if (cnode == 0)
-		return (KDM_TO_PHYS(PAGE_ALIGN((unsigned long)(&_end)) - 
-					(loadbase - K0BASE)) >> PAGE_SHIFT);
-	return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >> PAGE_SHIFT);
-}
 
-/*
- * Return the number of pages of memory provided by the given slot
- * on the specified node.
- */
-pfn_t slot_getsize(cnodeid_t node, int slot)
-{
-	return (pfn_t) slot_psize_cache[node][slot];
-}
-
-/*
- * Return highest slot filled
- */
-int node_getlastslot(cnodeid_t node)
-{
-	return (int) slot_lastfilled_cache[node];
-}
+	/* Note that all firmware passed argument registers still
+	   have their values.  */
+	jal	prom_init			# initialize firmware
 
-/*
- * Return the pfn of the last free page of memory on a node.
- */
-pfn_t node_getmaxclick(cnodeid_t node)
-{
-	pfn_t	slot_psize;
-	int	slot;
+	CLI					# disable interrupts
 
+	mfc0	t0, CP0_STATUS
 	/*
-	 * Start at the top slot. When we find a slot with memory in it,
-	 * that's the winner.
+	 * On IP27, I am seeing the TS bit set when the
+	 * kernel is loaded. Maybe because the kernel is
+	 * in ckseg0 and not xkphys? Clear it anyway ...
 	 */
-	for (slot = (node_getnumslots(node) - 1); slot >= 0; slot--) {
-		if ((slot_psize = slot_getsize(node, slot))) {
-			if (slot_psize == SLOT_IGNORED)
-				continue;
-			/* Return the basepfn + the slot size, minus 1. */
-			return slot_getbasepfn(node, slot) + slot_psize - 1;
-		}
-	}
+	li	t1, ~(ST0_TS|ST0_CU1|ST0_CU2|ST0_CU3)
+	and	t0, t1
+	or	t0, (ST0_CU0|ST0_KX|ST0_SX|ST0_FR) # Bogosity: cu0 indicates kernel
+	mtc0	t0, CP0_STATUS			   # thread in copy_thread.
+
+	la	$28, init_task_union		# init current pointer
+	daddiu	t0, $28, KERNEL_STACK_SIZE-32
+	sd	t0, kernelsp
+	dsubu	sp, t0, 4*SZREG			# init stack pointer
+	move	t0, $28
+#ifdef CONFIG_SMP
+	mtc0	t0, CP0_WATCHLO
+	dsrl32	t0, t0, 0
+	mtc0	t0, CP0_WATCHHI
+#endif
+	jal	start_kernel
+1:	b	1b				# just in case ...
+	END(kernel_entry)
 
+NESTED(mapped_kernel_setup_tlb, 16, sp)
+#ifdef CONFIG_MAPPED_KERNEL
 	/*
-	 * If there's no memory on the node, return 0. This is likely
-	 * to cause problems.
+	 * This needs to read the nasid - assume 0 for now.
+	 * Drop in 0xffffffffc0000000 in tlbhi, 0+DVG in tlblo_0,
+	 * 0x10000+DVG in tlblo_1. Assumes sash will load kernel
+	 * at physical 0x1c000 and virtual 0xa80000000001c000.
+	 * (mips64/Makefile has a --change-address to do this).
 	 */
-	return (pfn_t)0;
-}
-
-static pfn_t slot_psize_compute(cnodeid_t node, int slot)
-{
-	nasid_t nasid;
-	lboard_t *brd;
-	klmembnk_t *banks;
-	unsigned long size;
-
-	nasid = COMPACT_TO_NASID_NODEID(node);
-	/* Find the node board */
-	brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
-	if (!brd)
-		return 0;
-
-	/* Get the memory bank structure */
-	banks = (klmembnk_t *)find_first_component(brd, KLSTRUCT_MEMBNK);
-	if (!banks)
-		return 0;
-
-	/* Size in _Megabytes_ */
-	size = (unsigned long)banks->membnk_bnksz[slot/4];
-
-	/* hack for 128 dimm banks */
-	if (size <= 128) {
-		if (slot%4 == 0) {
-			size <<= 20;		/* size in bytes */
-			return(size >> PAGE_SHIFT);
-		} else {
-			return 0;
-		}
-	} else {
-		size /= 4;
-		size <<= 20;
-		return(size >> PAGE_SHIFT);
-	}
-}
-
-pfn_t szmem(pfn_t fpage, pfn_t maxpmem)
-{
-	cnodeid_t node;
-	int slot, numslots;
-	pfn_t num_pages = 0, slot_psize;
-	pfn_t slot0sz = 0, nodebytes;	/* Hack to detect problem configs */
-	int ignore;
-
-	for (node = 0; node < numnodes; node++) {
-		numslots = node_getnumslots(node);
-		ignore = nodebytes = 0;
-		for (slot = 0; slot < numslots; slot++) {
-			slot_psize = slot_psize_compute(node, slot);
-			if (slot == 0) slot0sz = slot_psize;
-			/* 
-			 * We need to refine the hack when we have replicated
-			 * kernel text.
-			 */
-			nodebytes += SLOT_SIZE;
-			if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
-						(slot0sz << PAGE_SHIFT))
-				ignore = 1;
-			if (ignore && slot_psize) {
-				printk("Ignoring slot %d onwards on node %d\n",
-								slot, node);
-				slot_psize_cache[node][slot] = SLOT_IGNORED;
-				slot = numslots;
-				continue;
-			}
-			num_pages += slot_psize;
-			slot_psize_cache[node][slot] = 
-					(unsigned short) slot_psize;
-			if (slot_psize)
-				slot_lastfilled_cache[node] = slot;
-		}
-	}
-	if (maxpmem)
-		return((maxpmem > num_pages) ? num_pages : maxpmem);
-	else
-		return num_pages;
-}
-
-/*
- * HACK ALERT - Things do not work if this is not here. Maybe this is
- * acting as a pseudocacheflush operation. The write pattern seems to
- * be important, writing a 0 does not help.
- */
-void setup_test(cnodeid_t node, pfn_t start, pfn_t end)
-{
-	unsigned long *ptr = __va(start << PAGE_SHIFT);
-	unsigned long size = 4 * 1024 * 1024;	/* 4M L2 caches */
-
-	while (size) {
-		size -= sizeof(unsigned long);
-		*ptr = (0xdeadbeefbabeb000UL|node);
-		/* *ptr = 0; */
-		ptr++;
-	}
-}
-
-/*
- * Currently, the intranode memory hole support assumes that each slot
- * contains at least 32 MBytes of memory. We assume all bootmem data
- * fits on the first slot.
- */
-void __init prom_meminit(void)
-{
-	extern void mlreset(void);
-	cnodeid_t node;
-	pfn_t slot_firstpfn, slot_lastpfn, slot_freepfn;
-	unsigned long bootmap_size;
-	int node_datasz;
-
-	node_datasz = PFN_UP(sizeof(plat_pg_data_t));
-	mlreset();
-	numpages = szmem(0, 0);
-	for (node = (numnodes - 1); node >= 0; node--) {
-		slot_firstpfn = slot_getbasepfn(node, 0);
-		slot_lastpfn = slot_firstpfn + slot_getsize(node, 0);
-		slot_freepfn = node_getfirstfree(node);
-		/* Foll line hack for non discontigmem; remove once discontigmem
-		 * becomes the default. */
-		max_low_pfn = (slot_lastpfn - slot_firstpfn);
-		if (node != 0) 
-			setup_test(node, slot_freepfn, slot_lastpfn);
-		/*
-		 * Allocate the node data structure on the node first.
-		 */
-		plat_node_data[node] = (plat_pg_data_t *)(__va(slot_freepfn \
-							<< PAGE_SHIFT));
-		NODE_DATA(node)->bdata = plat_node_bdata + node;
-		slot_freepfn += node_datasz;
-	  	bootmap_size = init_bootmem_node(node, slot_freepfn, 
-						slot_firstpfn, slot_lastpfn);
-		free_bootmem_node(node, slot_firstpfn << PAGE_SHIFT, 
-				(slot_lastpfn - slot_firstpfn) << PAGE_SHIFT);
-		reserve_bootmem_node(node, slot_firstpfn << PAGE_SHIFT,
-		  ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size);
-	}
-	printk("Total memory probed : 0x%lx pages\n", numpages);
-}
-
-int __init page_is_ram(unsigned long pagenr)
-{
-        return 1;
-}
-
-void __init
-prom_free_prom_memory (void)
-{
-	/* We got nothing to free here ...  */
-}
-
-#ifdef CONFIG_DISCONTIGMEM
-
-void __init paging_init(void)
-{
-	cnodeid_t node;
-	unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
-
-	/* Initialize the entire pgd.  */
-	pgd_init((unsigned long)swapper_pg_dir);
-	pmd_init((unsigned long)invalid_pmd_table);
-	memset((void *)invalid_pte_table, 0, sizeof(pte_t) * 2 * PTRS_PER_PTE);
-
-	for (node = 0; node < numnodes; node++) {
-		pfn_t start_pfn = slot_getbasepfn(node, 0);
-		pfn_t end_pfn = node_getmaxclick(node);
-
-		zones_size[ZONE_DMA] = end_pfn + 1 - start_pfn;
-		free_area_init_node(node, NODE_DATA(node), zones_size, 
-						start_pfn << PAGE_SHIFT, 0);
-		if ((PLAT_NODE_DATA_STARTNR(node) + 
-					PLAT_NODE_DATA_SIZE(node)) > pagenr)
-			pagenr = PLAT_NODE_DATA_STARTNR(node) +
-					PLAT_NODE_DATA_SIZE(node);
-	}
-}
-
-void __init mem_init(void)
-{
-	extern char _stext, _etext, _fdata, _edata;
-	extern char __init_begin, __init_end;
-	extern unsigned long totalram_pages;
-	extern unsigned long setup_zero_pages(void);
-	cnodeid_t nid;
-	unsigned long tmp, ram;
-	unsigned long codesize, reservedpages, datasize, initsize;
-	int slot, numslots;
-	struct page *pg, *pslot;
-	pfn_t pgnr;
-
-	num_physpages = numpages;	/* memory already sized by szmem */
-	max_mapnr = pagenr;		/* already found during paging_init */
-	high_memory = (void *) __va(max_mapnr << PAGE_SHIFT);
-
-	for (nid = 0; nid < numnodes; nid++) {
-
-		/*
-		 * Hack till free_area_init_core() zeroes free_pages
-		 */
-		for (tmp = 0; tmp < MAX_NR_ZONES; tmp++)
-			PLAT_NODE_DATA(nid)->gendata.node_zones[tmp].free_pages=0;
-		/*
-	 	 * This will free up the bootmem, ie, slot 0 memory.
-	 	 */
-		totalram_pages += free_all_bootmem_node(nid);
-
-		/*
-		 * We need to manually do the other slots.
-		 */
-		pg = NODE_DATA(nid)->node_mem_map + slot_getsize(nid, 0);
-		pgnr = PLAT_NODE_DATA_STARTNR(nid) + slot_getsize(nid, 0);
-		numslots = node_getlastslot(nid);
-		for (slot = 1; slot <= numslots; slot++) {
-			pslot = NODE_DATA(nid)->node_mem_map + 
-			   slot_getbasepfn(nid, slot) - slot_getbasepfn(nid, 0);
-
-			/*
-			 * Mark holes in previous slot. May also want to
-			 * free up the pages that hold the memmap entries.
-			 */
-			while (pg < pslot) {
-				pg->flags |= (1<<PG_skip);
-				pg++; pgnr++;
-			}
-
-			/*
-			 * Free valid memory in current slot.
-			 */
-			pslot += slot_getsize(nid, slot);
-			while (pg < pslot) {
-				if (!page_is_ram(pgnr))
-					continue;
-				ClearPageReserved(pg);
-				atomic_set(&pg->count, 1);
-				__free_page(pg);
-				totalram_pages++;
-				pg++; pgnr++;
-			}
-		}
-	}
-
-	totalram_pages -= setup_zero_pages();	/* This comes from node 0 */
-
-	reservedpages = ram = 0;
-	for (nid = 0; nid < numnodes; nid++) {
-		for (tmp = PLAT_NODE_DATA_STARTNR(nid); tmp < 
-			(PLAT_NODE_DATA_STARTNR(nid) +
-			PLAT_NODE_DATA_SIZE(nid)); tmp++) {
-			/* Ignore holes */
-			if (PageSkip(mem_map+tmp))
-				continue;
-			if (page_is_ram(tmp)) {
-				ram++;
-				if (PageReserved(mem_map+tmp))
-					reservedpages++;
-			}
-		}
-	}
-
-	codesize =  (unsigned long) &_etext - (unsigned long) &_stext;
-	datasize =  (unsigned long) &_edata - (unsigned long) &_fdata;
-	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
-
-	printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, "
-		"%ldk data, %ldk init)\n",
-		(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
-		ram << (PAGE_SHIFT-10),
-		codesize >> 10,
-		reservedpages << (PAGE_SHIFT-10),
-		datasize >> 10,
-		initsize >> 10);
-}
-
-#endif /* CONFIG_DISCONTIGMEM */
+	or	a0, zero, zero
+	dli	t0, 0xffffffffc0000000
+	dmtc0	t0, CP0_ENTRYHI
+	li	t0, ((_PAGE_GLOBAL|_PAGE_VALID| _PAGE_DIRTY|_CACHE_CACHABLE_COW) >> 6)
+	mtc0	t0, CP0_ENTRYLO0	# physaddr 0, DVG, cach exlwr
+	mtc0	zero, CP0_ENTRYLO1	# 16M should be enough for text+data
+	li	t0, 0x1ffe000		# MAPPED_KERN_TLBMASK, TLBPGMASK_16M
+	mtc0	t0, CP0_PAGEMASK
+	li	t0, 0			# KMAP_INX
+	mtc0	t0, CP0_INDEX
+	li	t0, 1
+	mtc0	t0, CP0_WIRED
+	tlbwi
+#else
+	mtc0	zero, CP0_WIRED
+	tlbwi
+#endif
+	jr	ra
+	END(mapped_kernel_setup_tlb)
+
+NESTED(bootstrap, 16, sp)
+	jal	mapped_kernel_setup_tlb
+#ifdef CONFIG_ARC64
+	la	t0, 1f
+	jr	t0
+1:
+#endif
+	CLI
+	mfc0	t0, CP0_STATUS
+	li	t1, ~(ST0_CU1|ST0_CU2|ST0_CU3)
+	and	t0, t1
+	or	t0, (ST0_CU0|ST0_KX|ST0_SX|ST0_FR) # Bogosity: cu0 indicates kernel
+	mtc0	t0, CP0_STATUS			   # thread in copy_thread.
+	jal	cboot
+	END(bootstrap)
+
+	__FINIT
+
+	.comm	kernelsp, 8, 8			# current stackpointer
+
+#define PAGE_SIZE	0x1000
+
+	.macro	page name, order=0
+	.globl	\name
+	.org	. + (PAGE_SIZE << \order)
+\name:	.size	\name, (PAGE_SIZE << \order)
+	.type	\name, @object
+	.endm
+
+	.align	12
+	.data
+
+	page	swapper_pg_dir, 1
+	page	invalid_pte_table, 1
+	page	invalid_pmd_table, 1
+	page	empty_bad_page_table, 1
+	page	empty_bad_page