Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

18 files changed, 8432 insertions, 0 deletions

diff --git a/arch/sparc/mm/Makefile b/arch/sparc/mm/Makefile
new file mode 100644
index 00000000000..16eeba4b991
--- /dev/null
+++ b/arch/sparc/mm/Makefile
@@ -0,0 +1,23 @@
+# $Id: Makefile,v 1.38 2000/12/15 00:41:22 davem Exp $
+# Makefile for the linux Sparc-specific parts of the memory manager.
+#
+
+EXTRA_AFLAGS := -ansi
+
+obj-y    := fault.o init.o loadmmu.o generic.o extable.o btfixup.o
+
+ifeq ($(CONFIG_SUN4),y)
+obj-y	 += nosrmmu.o
+else
+obj-y	 += srmmu.o iommu.o io-unit.o hypersparc.o viking.o tsunami.o swift.o
+endif
+
+ifdef CONFIG_HIGHMEM
+obj-y	+= highmem.o
+endif
+
+ifdef CONFIG_SMP
+obj-y   += nosun4c.o
+else
+obj-y   += sun4c.o
+endif
diff --git a/arch/sparc/mm/btfixup.c b/arch/sparc/mm/btfixup.c
new file mode 100644
index 00000000000..f147a44c978
--- /dev/null
+++ b/arch/sparc/mm/btfixup.c
@@ -0,0 +1,336 @@
+/* $Id: btfixup.c,v 1.10 2000/05/09 17:40:13 davem Exp $
+ * btfixup.c: Boot time code fixup and relocator, so that
+ * we can get rid of most indirect calls to achieve single
+ * image sun4c and srmmu kernel.
+ *
+ * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <asm/btfixup.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/oplib.h>
+#include <asm/system.h>
+#include <asm/cacheflush.h>
+
+#define BTFIXUP_OPTIMIZE_NOP
+#define BTFIXUP_OPTIMIZE_OTHER
+
+extern char *srmmu_name;
+static char version[] __initdata = "Boot time fixup v1.6. 4/Mar/98 Jakub Jelinek (jj@ultra.linux.cz). Patching kernel for ";
+#ifdef CONFIG_SUN4
+static char str_sun4c[] __initdata = "sun4\n";
+#else
+static char str_sun4c[] __initdata = "sun4c\n";
+#endif
+static char str_srmmu[] __initdata = "srmmu[%s]/";
+static char str_iommu[] __initdata = "iommu\n";
+static char str_iounit[] __initdata = "io-unit\n";
+
+static int visited __initdata = 0;
+extern unsigned int ___btfixup_start[], ___btfixup_end[], __init_begin[], __init_end[], __init_text_end[];
+extern unsigned int _stext[], _end[], __start___ksymtab[], __stop___ksymtab[];
+static char wrong_f[] __initdata = "Trying to set f fixup %p to invalid function %08x\n";
+static char wrong_b[] __initdata = "Trying to set b fixup %p to invalid function %08x\n";
+static char wrong_s[] __initdata = "Trying to set s fixup %p to invalid value %08x\n";
+static char wrong_h[] __initdata = "Trying to set h fixup %p to invalid value %08x\n";
+static char wrong_a[] __initdata = "Trying to set a fixup %p to invalid value %08x\n";
+static char wrong[] __initdata = "Wrong address for %c fixup %p\n";
+static char insn_f[] __initdata = "Fixup f %p refers to weird instructions at %p[%08x,%08x]\n";
+static char insn_b[] __initdata = "Fixup b %p doesn't refer to a SETHI at %p[%08x]\n";
+static char insn_s[] __initdata = "Fixup s %p doesn't refer to an OR at %p[%08x]\n";
+static char insn_h[] __initdata = "Fixup h %p doesn't refer to a SETHI at %p[%08x]\n";
+static char insn_a[] __initdata = "Fixup a %p doesn't refer to a SETHI nor OR at %p[%08x]\n";
+static char insn_i[] __initdata = "Fixup i %p doesn't refer to a valid instruction at %p[%08x]\n";
+static char fca_und[] __initdata = "flush_cache_all undefined in btfixup()\n";
+static char wrong_setaddr[] __initdata = "Garbled CALL/INT patch at %p[%08x,%08x,%08x]=%08x\n";
+
+#ifdef BTFIXUP_OPTIMIZE_OTHER
+static void __init set_addr(unsigned int *addr, unsigned int q1, int fmangled, unsigned int value)
+{
+	if (!fmangled)
+		*addr = value;
+	else {
+		unsigned int *q = (unsigned int *)q1;
+		if (*addr == 0x01000000) {
+			/* Noped */
+			*q = value;
+		} else if (addr[-1] == *q) {
+			/* Moved */
+			addr[-1] = value;
+			*q = value;
+		} else {
+			prom_printf(wrong_setaddr, addr-1, addr[-1], *addr, *q, value);
+			prom_halt();
+		}
+	}
+}
+#else
+static __inline__ void set_addr(unsigned int *addr, unsigned int q1, int fmangled, unsigned int value)
+{
+	*addr = value;
+}
+#endif
+
+void __init btfixup(void)
+{
+	unsigned int *p, *q;
+	int type, count;
+	unsigned insn;
+	unsigned *addr;
+	int fmangled = 0;
+	void (*flush_cacheall)(void);
+	
+	if (!visited) {
+		visited++;
+		printk(version);
+		if (ARCH_SUN4C_SUN4)
+			printk(str_sun4c);
+		else {
+			printk(str_srmmu, srmmu_name);
+			if (sparc_cpu_model == sun4d)
+				printk(str_iounit);
+			else
+				printk(str_iommu);
+		}
+	}
+	for (p = ___btfixup_start; p < ___btfixup_end; ) {
+		count = p[2];
+		q = p + 3;
+		switch (type = *(unsigned char *)p) {
+		case 'f': 
+			count = p[3];
+			q = p + 4;
+			if (((p[0] & 1) || p[1]) 
+			    && ((p[1] & 3) || (unsigned *)(p[1]) < _stext || (unsigned *)(p[1]) >= _end)) {
+				prom_printf(wrong_f, p, p[1]);
+				prom_halt();
+			}
+			break;
+		case 'b':
+			if (p[1] < (unsigned long)__init_begin || p[1] >= (unsigned long)__init_text_end || (p[1] & 3)) {
+				prom_printf(wrong_b, p, p[1]);
+				prom_halt();
+			}
+			break;
+		case 's':
+			if (p[1] + 0x1000 >= 0x2000) {
+				prom_printf(wrong_s, p, p[1]);
+				prom_halt();
+			}
+			break;
+		case 'h':
+			if (p[1] & 0x3ff) {
+				prom_printf(wrong_h, p, p[1]);
+				prom_halt();
+			}
+			break;
+		case 'a':
+			if (p[1] + 0x1000 >= 0x2000 && (p[1] & 0x3ff)) {
+				prom_printf(wrong_a, p, p[1]);
+				prom_halt();
+			}
+			break;
+		}
+		if (p[0] & 1) {
+			p[0] &= ~1;
+			while (count) {
+				fmangled = 0;
+				addr = (unsigned *)*q;
+				if (addr < _stext || addr >= _end) {
+					prom_printf(wrong, type, p);
+					prom_halt();
+				}
+				insn = *addr;
+#ifdef BTFIXUP_OPTIMIZE_OTHER				
+				if (type != 'f' && q[1]) {
+					insn = *(unsigned int *)q[1];
+					if (!insn || insn == 1)
+						insn = *addr;
+					else
+						fmangled = 1;
+				}
+#endif
+				switch (type) {
+				case 'f':	/* CALL */
+					if (addr >= __start___ksymtab && addr < __stop___ksymtab) {
+						*addr = p[1];
+						break;
+					} else if (!q[1]) {
+						if ((insn & 0xc1c00000) == 0x01000000) { /* SETHI */
+							*addr = (insn & 0xffc00000) | (p[1] >> 10); break;
+						} else if ((insn & 0xc1f82000) == 0x80102000) { /* OR X, %LO(i), Y */
+							*addr = (insn & 0xffffe000) | (p[1] & 0x3ff); break;
+						} else if ((insn & 0xc0000000) != 0x40000000) { /* !CALL */
+				bad_f:
+							prom_printf(insn_f, p, addr, insn, addr[1]);
+							prom_halt();
+						}
+					} else if (q[1] != 1)
+						addr[1] = q[1];
+					if (p[2] == BTFIXUPCALL_NORM) {
+				norm_f:	
+						*addr = 0x40000000 | ((p[1] - (unsigned)addr) >> 2);
+						q[1] = 0;
+						break;
+					}
+#ifndef BTFIXUP_OPTIMIZE_NOP
+					goto norm_f;
+#else
+					if (!(addr[1] & 0x80000000)) {
+						if ((addr[1] & 0xc1c00000) != 0x01000000)	/* !SETHI */
+							goto bad_f; /* CALL, Bicc, FBfcc, CBccc are weird in delay slot, aren't they? */
+					} else {
+						if ((addr[1] & 0x01800000) == 0x01800000) {
+							if ((addr[1] & 0x01f80000) == 0x01e80000) {
+								/* RESTORE */
+								goto norm_f; /* It is dangerous to patch that */
+							}
+							goto bad_f;
+						}
+						if ((addr[1] & 0xffffe003) == 0x9e03e000) {
+							/* ADD %O7, XX, %o7 */
+							int displac = (addr[1] << 19);
+							
+							displac = (displac >> 21) + 2;
+							*addr = (0x10800000) + (displac & 0x3fffff);
+							q[1] = addr[1];
+							addr[1] = p[2];
+							break;
+						}
+						if ((addr[1] & 0x201f) == 0x200f || (addr[1] & 0x7c000) == 0x3c000)
+							goto norm_f; /* Someone is playing bad tricks with us: rs1 or rs2 is o7 */
+						if ((addr[1] & 0x3e000000) == 0x1e000000)
+							goto norm_f; /* rd is %o7. We'd better take care. */
+					}
+					if (p[2] == BTFIXUPCALL_NOP) {
+						*addr = 0x01000000;
+						q[1] = 1;
+						break;
+					}
+#ifndef BTFIXUP_OPTIMIZE_OTHER
+					goto norm_f;
+#else
+					if (addr[1] == 0x01000000) {	/* NOP in the delay slot */
+						q[1] = addr[1];
+						*addr = p[2];
+						break;
+					}
+					if ((addr[1] & 0xc0000000) != 0xc0000000) {
+						/* Not a memory operation */
+						if ((addr[1] & 0x30000000) == 0x10000000) {
+							/* Ok, non-memory op with rd %oX */
+							if ((addr[1] & 0x3e000000) == 0x1c000000)
+								goto bad_f; /* Aiee. Someone is playing strange %sp tricks */
+							if ((addr[1] & 0x3e000000) > 0x12000000 ||
+							    ((addr[1] & 0x3e000000) == 0x12000000 &&
+							     p[2] != BTFIXUPCALL_STO1O0 && p[2] != BTFIXUPCALL_SWAPO0O1) ||
+							    ((p[2] & 0xffffe000) == BTFIXUPCALL_RETINT(0))) {
+								/* Nobody uses the result. We can nop it out. */
+								*addr = p[2];
+								q[1] = addr[1];
+								addr[1] = 0x01000000;
+								break;
+							}
+							if ((addr[1] & 0xf1ffffe0) == 0x90100000) {
+								/* MOV %reg, %Ox */
+								if ((addr[1] & 0x3e000000) == 0x10000000 &&
+								    (p[2] & 0x7c000) == 0x20000) {
+								    	/* Ok, it is call xx; mov reg, %o0 and call optimizes
+								    	   to doing something on %o0. Patch the patch. */
+									*addr = (p[2] & ~0x7c000) | ((addr[1] & 0x1f) << 14);
+									q[1] = addr[1];
+									addr[1] = 0x01000000;
+									break;
+								}
+								if ((addr[1] & 0x3e000000) == 0x12000000 &&
+								    p[2] == BTFIXUPCALL_STO1O0) {
+								    	*addr = (p[2] & ~0x3e000000) | ((addr[1] & 0x1f) << 25);
+								    	q[1] = addr[1];
+								    	addr[1] = 0x01000000;
+								    	break;
+								}
+							}
+						}
+					}
+					*addr = addr[1];
+					q[1] = addr[1];
+					addr[1] = p[2];
+					break;
+#endif /* BTFIXUP_OPTIMIZE_OTHER */
+#endif /* BTFIXUP_OPTIMIZE_NOP */
+				case 'b':	/* BLACKBOX */
+					/* Has to be sethi i, xx */
+					if ((insn & 0xc1c00000) != 0x01000000) {
+						prom_printf(insn_b, p, addr, insn);
+						prom_halt();
+					} else {
+						void (*do_fixup)(unsigned *);
+						
+						do_fixup = (void (*)(unsigned *))p[1];
+						do_fixup(addr);
+					}
+					break;
+				case 's':	/* SIMM13 */
+					/* Has to be or %g0, i, xx */
+					if ((insn & 0xc1ffe000) != 0x80102000) {
+						prom_printf(insn_s, p, addr, insn);
+						prom_halt();
+					}
+					set_addr(addr, q[1], fmangled, (insn & 0xffffe000) | (p[1] & 0x1fff));
+					break;
+				case 'h':	/* SETHI */
+					/* Has to be sethi i, xx */
+					if ((insn & 0xc1c00000) != 0x01000000) {
+						prom_printf(insn_h, p, addr, insn);
+						prom_halt();
+					}
+					set_addr(addr, q[1], fmangled, (insn & 0xffc00000) | (p[1] >> 10));
+					break;
+				case 'a':	/* HALF */
+					/* Has to be sethi i, xx or or %g0, i, xx */
+					if ((insn & 0xc1c00000) != 0x01000000 &&
+					    (insn & 0xc1ffe000) != 0x80102000) {
+						prom_printf(insn_a, p, addr, insn);
+						prom_halt();
+					}
+					if (p[1] & 0x3ff)
+						set_addr(addr, q[1], fmangled, 
+							(insn & 0x3e000000) | 0x80102000 | (p[1] & 0x1fff));
+					else
+						set_addr(addr, q[1], fmangled, 
+							(insn & 0x3e000000) | 0x01000000 | (p[1] >> 10));
+					break;
+				case 'i':	/* INT */
+					if ((insn & 0xc1c00000) == 0x01000000) /* %HI */
+						set_addr(addr, q[1], fmangled, (insn & 0xffc00000) | (p[1] >> 10));
+					else if ((insn & 0x80002000) == 0x80002000 &&
+					         (insn & 0x01800000) != 0x01800000) /* %LO */
+						set_addr(addr, q[1], fmangled, (insn & 0xffffe000) | (p[1] & 0x3ff));
+					else {
+						prom_printf(insn_i, p, addr, insn);
+						prom_halt();
+					}
+					break;
+				}
+				count -= 2;
+				q += 2;
+			}
+		} else
+			p = q + count;
+	}
+#ifdef CONFIG_SMP
+	flush_cacheall = (void (*)(void))BTFIXUPVAL_CALL(local_flush_cache_all);
+#else
+	flush_cacheall = (void (*)(void))BTFIXUPVAL_CALL(flush_cache_all);
+#endif
+	if (!flush_cacheall) {
+		prom_printf(fca_und);
+		prom_halt();
+	}
+	(*flush_cacheall)();
+}
diff --git a/arch/sparc/mm/extable.c b/arch/sparc/mm/extable.c
new file mode 100644
index 00000000000..c9845c71f42
--- /dev/null
+++ b/arch/sparc/mm/extable.c
@@ -0,0 +1,77 @@
+/*
+ * linux/arch/sparc/mm/extable.c
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <asm/uaccess.h>
+
+void sort_extable(struct exception_table_entry *start,
+		  struct exception_table_entry *finish)
+{
+}
+
+/* Caller knows they are in a range if ret->fixup == 0 */
+const struct exception_table_entry *
+search_extable(const struct exception_table_entry *start,
+	       const struct exception_table_entry *last,
+	       unsigned long value)
+{
+	const struct exception_table_entry *walk;
+
+	/* Single insn entries are encoded as:
+	 *	word 1:	insn address
+	 *	word 2:	fixup code address
+	 *
+	 * Range entries are encoded as:
+	 *	word 1: first insn address
+	 *	word 2: 0
+	 *	word 3: last insn address + 4 bytes
+	 *	word 4: fixup code address
+	 *
+	 * See asm/uaccess.h for more details.
+	 */
+
+	/* 1. Try to find an exact match. */
+	for (walk = start; walk <= last; walk++) {
+		if (walk->fixup == 0) {
+			/* A range entry, skip both parts. */
+			walk++;
+			continue;
+		}
+
+		if (walk->insn == value)
+			return walk;
+	}
+
+	/* 2. Try to find a range match. */
+	for (walk = start; walk <= (last - 1); walk++) {
+		if (walk->fixup)
+			continue;
+
+		if (walk[0].insn <= value && walk[1].insn > value)
+			return walk;
+
+		walk++;
+	}
+
+        return NULL;
+}
+
+/* Special extable search, which handles ranges.  Returns fixup */
+unsigned long search_extables_range(unsigned long addr, unsigned long *g2)
+{
+	const struct exception_table_entry *entry;
+
+	entry = search_exception_tables(addr);
+	if (!entry)
+		return 0;
+
+	/* Inside range?  Fix g2 and return correct fixup */
+	if (!entry->fixup) {
+		*g2 = (addr - entry->insn) / 4;
+		return (entry + 1)->fixup;
+	}
+
+	return entry->fixup;
+}
diff --git a/arch/sparc/mm/fault.c b/arch/sparc/mm/fault.c
new file mode 100644
index 00000000000..37f4107bae6
--- /dev/null
+++ b/arch/sparc/mm/fault.c
@@ -0,0 +1,596 @@
+/* $Id: fault.c,v 1.122 2001/11/17 07:19:26 davem Exp $
+ * fault.c:  Page fault handlers for the Sparc.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
+ * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <asm/head.h>
+
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/threads.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/memreg.h>
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/smp.h>
+#include <asm/traps.h>
+#include <asm/kdebug.h>
+#include <asm/uaccess.h>
+
+#define ELEMENTS(arr) (sizeof (arr)/sizeof (arr[0]))
+
+extern int prom_node_root;
+
+/* At boot time we determine these two values necessary for setting
+ * up the segment maps and page table entries (pte's).
+ */
+
+int num_segmaps, num_contexts;
+int invalid_segment;
+
+/* various Virtual Address Cache parameters we find at boot time... */
+
+int vac_size, vac_linesize, vac_do_hw_vac_flushes;
+int vac_entries_per_context, vac_entries_per_segment;
+int vac_entries_per_page;
+
+/* Nice, simple, prom library does all the sweating for us. ;) */
+int prom_probe_memory (void)
+{
+	register struct linux_mlist_v0 *mlist;
+	register unsigned long bytes, base_paddr, tally;
+	register int i;
+
+	i = 0;
+	mlist= *prom_meminfo()->v0_available;
+	bytes = tally = mlist->num_bytes;
+	base_paddr = (unsigned long) mlist->start_adr;
+  
+	sp_banks[0].base_addr = base_paddr;
+	sp_banks[0].num_bytes = bytes;
+
+	while (mlist->theres_more != (void *) 0){
+		i++;
+		mlist = mlist->theres_more;
+		bytes = mlist->num_bytes;
+		tally += bytes;
+		if (i > SPARC_PHYS_BANKS-1) {
+			printk ("The machine has more banks than "
+				"this kernel can support\n"
+				"Increase the SPARC_PHYS_BANKS "
+				"setting (currently %d)\n",
+				SPARC_PHYS_BANKS);
+			i = SPARC_PHYS_BANKS-1;
+			break;
+		}
+    
+		sp_banks[i].base_addr = (unsigned long) mlist->start_adr;
+		sp_banks[i].num_bytes = mlist->num_bytes;
+	}
+
+	i++;
+	sp_banks[i].base_addr = 0xdeadbeef;
+	sp_banks[i].num_bytes = 0;
+
+	/* Now mask all bank sizes on a page boundary, it is all we can
+	 * use anyways.
+	 */
+	for(i=0; sp_banks[i].num_bytes != 0; i++)
+		sp_banks[i].num_bytes &= PAGE_MASK;
+
+	return tally;
+}
+
+/* Traverse the memory lists in the prom to see how much physical we
+ * have.
+ */
+unsigned long
+probe_memory(void)
+{
+	int total;
+
+	total = prom_probe_memory();
+
+	/* Oh man, much nicer, keep the dirt in promlib. */
+	return total;
+}
+
+extern void sun4c_complete_all_stores(void);
+
+/* Whee, a level 15 NMI interrupt memory error.  Let's have fun... */
+asmlinkage void sparc_lvl15_nmi(struct pt_regs *regs, unsigned long serr,
+				unsigned long svaddr, unsigned long aerr,
+				unsigned long avaddr)
+{
+	sun4c_complete_all_stores();
+	printk("FAULT: NMI received\n");
+	printk("SREGS: Synchronous Error %08lx\n", serr);
+	printk("       Synchronous Vaddr %08lx\n", svaddr);
+	printk("      Asynchronous Error %08lx\n", aerr);
+	printk("      Asynchronous Vaddr %08lx\n", avaddr);
+	if (sun4c_memerr_reg)
+		printk("     Memory Parity Error %08lx\n", *sun4c_memerr_reg);
+	printk("REGISTER DUMP:\n");
+	show_regs(regs);
+	prom_halt();
+}
+
+static void unhandled_fault(unsigned long, struct task_struct *,
+		struct pt_regs *) __attribute__ ((noreturn));
+
+static void unhandled_fault(unsigned long address, struct task_struct *tsk,
+                     struct pt_regs *regs)
+{
+	if((unsigned long) address < PAGE_SIZE) {
+		printk(KERN_ALERT
+		    "Unable to handle kernel NULL pointer dereference\n");
+	} else {
+		printk(KERN_ALERT "Unable to handle kernel paging request "
+		       "at virtual address %08lx\n", address);
+	}
+	printk(KERN_ALERT "tsk->{mm,active_mm}->context = %08lx\n",
+		(tsk->mm ? tsk->mm->context : tsk->active_mm->context));
+	printk(KERN_ALERT "tsk->{mm,active_mm}->pgd = %08lx\n",
+		(tsk->mm ? (unsigned long) tsk->mm->pgd :
+		 	(unsigned long) tsk->active_mm->pgd));
+	die_if_kernel("Oops", regs);
+}
+
+asmlinkage int lookup_fault(unsigned long pc, unsigned long ret_pc, 
+			    unsigned long address)
+{
+	struct pt_regs regs;
+	unsigned long g2;
+	unsigned int insn;
+	int i;
+	
+	i = search_extables_range(ret_pc, &g2);
+	switch (i) {
+	case 3:
+		/* load & store will be handled by fixup */
+		return 3;
+
+	case 1:
+		/* store will be handled by fixup, load will bump out */
+		/* for _to_ macros */
+		insn = *((unsigned int *) pc);
+		if ((insn >> 21) & 1)
+			return 1;
+		break;
+
+	case 2:
+		/* load will be handled by fixup, store will bump out */
+		/* for _from_ macros */
+		insn = *((unsigned int *) pc);
+		if (!((insn >> 21) & 1) || ((insn>>19)&0x3f) == 15)
+			return 2; 
+		break; 
+
+	default:
+		break;
+	};
+
+	memset(&regs, 0, sizeof (regs));
+	regs.pc = pc;
+	regs.npc = pc + 4;
+	__asm__ __volatile__(
+		"rd %%psr, %0\n\t"
+		"nop\n\t"
+		"nop\n\t"
+		"nop\n" : "=r" (regs.psr));
+	unhandled_fault(address, current, &regs);
+
+	/* Not reached */
+	return 0;
+}
+
+extern unsigned long safe_compute_effective_address(struct pt_regs *,
+						    unsigned int);
+
+static unsigned long compute_si_addr(struct pt_regs *regs, int text_fault)
+{
+	unsigned int insn;
+
+	if (text_fault)
+		return regs->pc;
+
+	if (regs->psr & PSR_PS) {
+		insn = *(unsigned int *) regs->pc;
+	} else {
+		__get_user(insn, (unsigned int *) regs->pc);
+	}
+
+	return safe_compute_effective_address(regs, insn);
+}
+
+asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
+			       unsigned long address)
+{
+	struct vm_area_struct *vma;
+	struct task_struct *tsk = current;
+	struct mm_struct *mm = tsk->mm;
+	unsigned int fixup;
+	unsigned long g2;
+	siginfo_t info;
+	int from_user = !(regs->psr & PSR_PS);
+
+	if(text_fault)
+		address = regs->pc;
+
+	/*
+	 * We fault-in kernel-space virtual memory on-demand. The
+	 * 'reference' page table is init_mm.pgd.
+	 *
+	 * NOTE! We MUST NOT take any locks for this case. We may
+	 * be in an interrupt or a critical region, and should
+	 * only copy the information from the master page table,
+	 * nothing more.
+	 */
+	if (!ARCH_SUN4C_SUN4 && address >= TASK_SIZE)
+		goto vmalloc_fault;
+
+	info.si_code = SEGV_MAPERR;
+
+	/*
+	 * If we're in an interrupt or have no user
+	 * context, we must not take the fault..
+	 */
+        if (in_atomic() || !mm)
+                goto no_context;
+
+	down_read(&mm->mmap_sem);
+
+	/*
+	 * The kernel referencing a bad kernel pointer can lock up
+	 * a sun4c machine completely, so we must attempt recovery.
+	 */
+	if(!from_user && address >= PAGE_OFFSET)
+		goto bad_area;
+
+	vma = find_vma(mm, address);
+	if(!vma)
+		goto bad_area;
+	if(vma->vm_start <= address)
+		goto good_area;
+	if(!(vma->vm_flags & VM_GROWSDOWN))
+		goto bad_area;
+	if(expand_stack(vma, address))
+		goto bad_area;
+	/*
+	 * Ok, we have a good vm_area for this memory access, so
+	 * we can handle it..
+	 */
+good_area:
+	info.si_code = SEGV_ACCERR;
+	if(write) {
+		if(!(vma->vm_flags & VM_WRITE))
+			goto bad_area;
+	} else {
+		/* Allow reads even for write-only mappings */
+		if(!(vma->vm_flags & (VM_READ | VM_EXEC)))
+			goto bad_area;
+	}
+
+	/*
+	 * If for any reason at all we couldn't handle the fault,
+	 * make sure we exit gracefully rather than endlessly redo
+	 * the fault.
+	 */
+	switch (handle_mm_fault(mm, vma, address, write)) {
+	case VM_FAULT_SIGBUS:
+		goto do_sigbus;
+	case VM_FAULT_OOM:
+		goto out_of_memory;
+	case VM_FAULT_MAJOR:
+		current->maj_flt++;
+		break;
+	case VM_FAULT_MINOR:
+	default:
+		current->min_flt++;
+		break;
+	}
+	up_read(&mm->mmap_sem);
+	return;
+
+	/*
+	 * Something tried to access memory that isn't in our memory map..
+	 * Fix it, but check if it's kernel or user first..
+	 */
+bad_area:
+	up_read(&mm->mmap_sem);
+
+bad_area_nosemaphore:
+	/* User mode accesses just cause a SIGSEGV */
+	if(from_user) {
+#if 0
+		printk("Fault whee %s [%d]: segfaults at %08lx pc=%08lx\n",
+		       tsk->comm, tsk->pid, address, regs->pc);
+#endif
+		info.si_signo = SIGSEGV;
+		info.si_errno = 0;
+		/* info.si_code set above to make clear whether
+		   this was a SEGV_MAPERR or SEGV_ACCERR fault.  */
+		info.si_addr = (void __user *)compute_si_addr(regs, text_fault);
+		info.si_trapno = 0;
+		force_sig_info (SIGSEGV, &info, tsk);
+		return;
+	}
+
+	/* Is this in ex_table? */
+no_context:
+	g2 = regs->u_regs[UREG_G2];
+	if (!from_user && (fixup = search_extables_range(regs->pc, &g2))) {
+		if (fixup > 10) { /* Values below are reserved for other things */
+			extern const unsigned __memset_start[];
+			extern const unsigned __memset_end[];
+			extern const unsigned __csum_partial_copy_start[];
+			extern const unsigned __csum_partial_copy_end[];
+
+#ifdef DEBUG_EXCEPTIONS
+			printk("Exception: PC<%08lx> faddr<%08lx>\n", regs->pc, address);
+			printk("EX_TABLE: insn<%08lx> fixup<%08x> g2<%08lx>\n",
+				regs->pc, fixup, g2);
+#endif
+			if ((regs->pc >= (unsigned long)__memset_start &&
+			     regs->pc < (unsigned long)__memset_end) ||
+			    (regs->pc >= (unsigned long)__csum_partial_copy_start &&
+			     regs->pc < (unsigned long)__csum_partial_copy_end)) {
+			        regs->u_regs[UREG_I4] = address;
+				regs->u_regs[UREG_I5] = regs->pc;
+			}
+			regs->u_regs[UREG_G2] = g2;
+			regs->pc = fixup;
+			regs->npc = regs->pc + 4;
+			return;
+		}
+	}
+	
+	unhandled_fault (address, tsk, regs);
+	do_exit(SIGKILL);
+
+/*
+ * We ran out of memory, or some other thing happened to us that made
+ * us unable to handle the page fault gracefully.
+ */
+out_of_memory:
+	up_read(&mm->mmap_sem);
+	printk("VM: killing process %s\n", tsk->comm);
+	if (from_user)
+		do_exit(SIGKILL);
+	goto no_context;
+
+do_sigbus:
+	up_read(&mm->mmap_sem);
+	info.si_signo = SIGBUS;
+	info.si_errno = 0;
+	info.si_code = BUS_ADRERR;
+	info.si_addr = (void __user *) compute_si_addr(regs, text_fault);
+	info.si_trapno = 0;
+	force_sig_info (SIGBUS, &info, tsk);
+	if (!from_user)
+		goto no_context;
+
+vmalloc_fault:
+	{
+		/*
+		 * Synchronize this task's top level page-table
+		 * with the 'reference' page table.
+		 */
+		int offset = pgd_index(address);
+		pgd_t *pgd, *pgd_k;
+		pmd_t *pmd, *pmd_k;
+
+		pgd = tsk->active_mm->pgd + offset;
+		pgd_k = init_mm.pgd + offset;
+
+		if (!pgd_present(*pgd)) {
+			if (!pgd_present(*pgd_k))
+				goto bad_area_nosemaphore;
+			pgd_val(*pgd) = pgd_val(*pgd_k);
+			return;
+		}
+
+		pmd = pmd_offset(pgd, address);
+		pmd_k = pmd_offset(pgd_k, address);
+
+		if (pmd_present(*pmd) || !pmd_present(*pmd_k))
+			goto bad_area_nosemaphore;
+		*pmd = *pmd_k;
+		return;
+	}
+}
+
+asmlinkage void do_sun4c_fault(struct pt_regs *regs, int text_fault, int write,
+			       unsigned long address)
+{
+	extern void sun4c_update_mmu_cache(struct vm_area_struct *,
+					   unsigned long,pte_t);
+	extern pte_t *sun4c_pte_offset_kernel(pmd_t *,unsigned long);
+	struct task_struct *tsk = current;
+	struct mm_struct *mm = tsk->mm;
+	pgd_t *pgdp;
+	pte_t *ptep;
+
+	if (text_fault) {
+		address = regs->pc;
+	} else if (!write &&
+		   !(regs->psr & PSR_PS)) {
+		unsigned int insn, __user *ip;
+
+		ip = (unsigned int __user *)regs->pc;
+		if (!get_user(insn, ip)) {
+			if ((insn & 0xc1680000) == 0xc0680000)
+				write = 1;
+		}
+	}
+
+	if (!mm) {
+		/* We are oopsing. */
+		do_sparc_fault(regs, text_fault, write, address);
+		BUG();	/* P3 Oops already, you bitch */
+	}
+
+	pgdp = pgd_offset(mm, address);
+	ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, address);
+
+	if (pgd_val(*pgdp)) {
+	    if (write) {
+		if ((pte_val(*ptep) & (_SUN4C_PAGE_WRITE|_SUN4C_PAGE_PRESENT))
+				   == (_SUN4C_PAGE_WRITE|_SUN4C_PAGE_PRESENT)) {
+			unsigned long flags;
+
+			*ptep = __pte(pte_val(*ptep) | _SUN4C_PAGE_ACCESSED |
+				      _SUN4C_PAGE_MODIFIED |
+				      _SUN4C_PAGE_VALID |
+				      _SUN4C_PAGE_DIRTY);
+
+			local_irq_save(flags);
+			if (sun4c_get_segmap(address) != invalid_segment) {
+				sun4c_put_pte(address, pte_val(*ptep));
+				local_irq_restore(flags);
+				return;
+			}
+			local_irq_restore(flags);
+		}
+	    } else {
+		if ((pte_val(*ptep) & (_SUN4C_PAGE_READ|_SUN4C_PAGE_PRESENT))
+				   == (_SUN4C_PAGE_READ|_SUN4C_PAGE_PRESENT)) {
+			unsigned long flags;
+
+			*ptep = __pte(pte_val(*ptep) | _SUN4C_PAGE_ACCESSED |
+				      _SUN4C_PAGE_VALID);
+
+			local_irq_save(flags);
+			if (sun4c_get_segmap(address) != invalid_segment) {
+				sun4c_put_pte(address, pte_val(*ptep));
+				local_irq_restore(flags);
+				return;
+			}
+			local_irq_restore(flags);
+		}
+	    }
+	}
+
+	/* This conditional is 'interesting'. */
+	if (pgd_val(*pgdp) && !(write && !(pte_val(*ptep) & _SUN4C_PAGE_WRITE))
+	    && (pte_val(*ptep) & _SUN4C_PAGE_VALID))
+		/* Note: It is safe to not grab the MMAP semaphore here because
+		 *       we know that update_mmu_cache() will not sleep for
+		 *       any reason (at least not in the current implementation)
+		 *       and therefore there is no danger of another thread getting
+		 *       on the CPU and doing a shrink_mmap() on this vma.
+		 */
+		sun4c_update_mmu_cache (find_vma(current->mm, address), address,
+					*ptep);
+	else
+		do_sparc_fault(regs, text_fault, write, address);
+}
+
+/* This always deals with user addresses. */
+inline void force_user_fault(unsigned long address, int write)
+{
+	struct vm_area_struct *vma;
+	struct task_struct *tsk = current;
+	struct mm_struct *mm = tsk->mm;
+	siginfo_t info;
+
+	info.si_code = SEGV_MAPERR;
+
+#if 0
+	printk("wf<pid=%d,wr=%d,addr=%08lx>\n",
+	       tsk->pid, write, address);
+#endif
+	down_read(&mm->mmap_sem);
+	vma = find_vma(mm, address);
+	if(!vma)
+		goto bad_area;
+	if(vma->vm_start <= address)
+		goto good_area;
+	if(!(vma->vm_flags & VM_GROWSDOWN))
+		goto bad_area;
+	if(expand_stack(vma, address))
+		goto bad_area;
+good_area:
+	info.si_code = SEGV_ACCERR;
+	if(write) {
+		if(!(vma->vm_flags & VM_WRITE))
+			goto bad_area;
+	} else {
+		if(!(vma->vm_flags & (VM_READ | VM_EXEC)))
+			goto bad_area;
+	}
+	switch (handle_mm_fault(mm, vma, address, write)) {
+	case VM_FAULT_SIGBUS:
+	case VM_FAULT_OOM:
+		goto do_sigbus;
+	}
+	up_read(&mm->mmap_sem);
+	return;
+bad_area:
+	up_read(&mm->mmap_sem);
+#if 0
+	printk("Window whee %s [%d]: segfaults at %08lx\n",
+	       tsk->comm,