[PATCH] arch/parisc/mm

Update arch/parisc/mm

arch/parisc/mm/Makefile

@@ -2,6 +2,6 @@
 # Makefile for the linux parisc-specific parts of the memory manager.
 #
 
-objs-y	 := init.o fault.o kmap.o extable.o
+obj-y	 := init.o fault.o extable.o ioremap.o
 
 include $(TOPDIR)/Rules.make

arch/parisc/mm/extable.c

@@ -46,17 +46,17 @@ search_one_table (const struct exception_table_entry *first,
 const struct exception_table_entry *
 search_exception_table (unsigned long addr)
 {
-#ifndef CONFIG_MODULE
+#ifndef CONFIG_MODULES
 	/* There is only the kernel to search.  */
 	return search_one_table(__start___ex_table, 
                                 __stop___ex_table - 1, 
                                 addr);
 #else
-	struct exception_table_entry *ret;
 	/* The kernel is the last "module" -- no need to treat it special. */
 	struct module *mp;
 
 	for (mp = module_list; mp ; mp = mp->next) {
+		const struct exception_table_entry *ret;
 		if (!mp->ex_table_start)
 			continue;
 		ret = search_one_table(mp->ex_table_start, mp->ex_table_end - 1,

arch/parisc/mm/fault.c

@@ -17,6 +17,10 @@
 #include <linux/interrupt.h>
 
 #include <asm/uaccess.h>
+#include <asm/traps.h>
+
+#define PRINT_USER_FAULTS /* (turn this on if you want user faults to be */
+			 /*  dumped to the console via printk)          */
 
 
 /* Defines for parisc_acctyp()	*/
@@ -114,59 +118,31 @@ parisc_acctyp(unsigned long code, unsigned int inst)
 #undef isGraphicsFlushRead
 #undef BITSSET
 
-/* This is similar to expand_stack(), except that it is for stacks
- * that grow upwards.
- */
-
-static inline int expand_stackup(struct vm_area_struct * vma, unsigned long address)
-{
-	unsigned long grow;
-
-	address += 4 + PAGE_SIZE - 1;
-	address &= PAGE_MASK;
-	grow = (address - vma->vm_end) >> PAGE_SHIFT;
-	if (address - vma->vm_start > current->rlim[RLIMIT_STACK].rlim_cur ||
-	    ((vma->vm_mm->total_vm + grow) << PAGE_SHIFT) > current->rlim[RLIMIT_AS].rlim_cur)
-		return -ENOMEM;
-	vma->vm_end = address;
-	vma->vm_mm->total_vm += grow;
-	if (vma->vm_flags & VM_LOCKED)
-		vma->vm_mm->locked_vm += grow;
-	return 0;
-}
-
-
-/* This is similar to find_vma(), except that it understands that stacks
- * grow up rather than down.
- * XXX Optimise by making use of cache and avl tree as per find_vma().
- */
-
-struct vm_area_struct * pa_find_vma(struct mm_struct * mm, unsigned long addr)
-{
-	struct vm_area_struct *vma = NULL;
-
-	if (mm) {
-		vma = mm->mmap;
-		if (!vma || addr < vma->vm_start)
-			return NULL;
-		while (vma->vm_next && addr >= vma->vm_next->vm_start)
-			vma = vma->vm_next;
-	}
-	return vma;
-}
-
 
-/*
- * This routine handles page faults.  It determines the address,
- * and the problem, and then passes it off to one of the appropriate
- * routines.
+#if 0
+/* This is the treewalk to find a vma which is the highest that has
+ * a start < addr.  We're using find_vma_prev instead right now, but
+ * we might want to use this at some point in the future.  Probably
+ * not, but I want it committed to CVS so I don't lose it :-)
  */
-extern void parisc_terminate(char *, struct pt_regs *, int, unsigned long);
+			while (tree != vm_avl_empty) {
+				if (tree->vm_start > addr) {
+					tree = tree->vm_avl_left;
+				} else {
+					prev = tree;
+					if (prev->vm_next == NULL)
+						break;
+					if (prev->vm_next->vm_start > addr)
+						break;
+					tree = tree->vm_avl_right;
+				}
+			}
+#endif
 
 void do_page_fault(struct pt_regs *regs, unsigned long code,
 			      unsigned long address)
 {
-	struct vm_area_struct * vma;
+	struct vm_area_struct *vma, *prev_vma;
 	struct task_struct *tsk = current;
 	struct mm_struct *mm = tsk->mm;
 	const struct exception_table_entry *fix;
@@ -176,13 +152,9 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
 		goto no_context;
 
 	down_read(&mm->mmap_sem);
-	vma = pa_find_vma(mm, address);
-	if (!vma)
-		goto bad_area;
-	if (address < vma->vm_end)
-		goto good_area;
-	if (!(vma->vm_flags & VM_GROWSUP) || expand_stackup(vma, address))
-		goto bad_area;
+	vma = find_vma_prev(mm, address, &prev_vma);
+	if (!vma || address < vma->vm_start)
+		goto check_expansion;
 /*
  * Ok, we have a good vm_area for this memory access. We still need to
  * check the access permissions.
@@ -221,6 +193,11 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
 	up_read(&mm->mmap_sem);
 	return;
 
+check_expansion:
+	vma = prev_vma;
+	if (vma && (expand_stack(vma, address) == 0))
+		goto good_area;
+
 /*
  * Something tried to access memory that isn't in our memory map..
  */
@@ -230,9 +207,16 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
 	if (user_mode(regs)) {
 		struct siginfo si;
 
-		printk("\ndo_page_fault() pid=%d command='%s'\n",
-		    tsk->pid, tsk->comm);
+#ifdef PRINT_USER_FAULTS
+		printk(KERN_DEBUG "\n");
+		printk(KERN_DEBUG "do_page_fault() pid=%d command='%s' type=%lu address=0x%08lx\n",
+		    tsk->pid, tsk->comm, code, address);
+		if (vma) {
+			printk(KERN_DEBUG "vm_start = 0x%08lx, vm_end = 0x%08lx\n",
+					vma->vm_start, vma->vm_end);
+		}
 		show_regs(regs);
+#endif
 		/* FIXME: actually we need to get the signo and code correct */
 		si.si_signo = SIGSEGV;
 		si.si_errno = 0;
@@ -272,11 +256,11 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
 		}
 	}
 
-	parisc_terminate("Bad Address (null pointer deref?)",regs,code,address);
+	parisc_terminate("Bad Address (null pointer deref?)", regs, code, address);
 
   out_of_memory:
 	up_read(&mm->mmap_sem);
-	printk("VM: killing process %s\n", current->comm);
+	printk(KERN_CRIT "VM: killing process %s\n", current->comm);
 	if (user_mode(regs))
 		do_exit(SIGKILL);
 	goto no_context;

arch/parisc/mm/ioremap.c

+/*
+ * arch/parisc/mm/ioremap.c
+ *
+ * Re-map IO memory to kernel address space so that we can access it.
+ * This is needed for high PCI addresses that aren't mapped in the
+ * 640k-1MB IO memory area on PC's
+ *
+ * (C) Copyright 1995 1996 Linus Torvalds
+ * (C) Copyright 2001 Helge Deller <deller@gmx.de>
+ */
+
+#include <linux/vmalloc.h>
+#include <linux/errno.h>
+#include <asm/io.h>
+#include <asm/pgalloc.h>
+
+static inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
+	unsigned long phys_addr, unsigned long flags)
+{
+	unsigned long end;
+
+	address &= ~PMD_MASK;
+	end = address + size;
+	if (end > PMD_SIZE)
+		end = PMD_SIZE;
+	if (address >= end)
+		BUG();
+	do {
+		if (!pte_none(*pte)) {
+			printk(KERN_ERR "remap_area_pte: page already exists\n");
+			BUG();
+		}
+		set_pte(pte, mk_pte_phys(phys_addr, __pgprot(_PAGE_PRESENT | _PAGE_RW | 
+					_PAGE_DIRTY | _PAGE_ACCESSED | flags)));
+		address += PAGE_SIZE;
+		phys_addr += PAGE_SIZE;
+		pte++;
+	} while (address && (address < end));
+}
+
+static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
+	unsigned long phys_addr, unsigned long flags)
+{
+	unsigned long end;
+
+	address &= ~PGDIR_MASK;
+	end = address + size;
+	if (end > PGDIR_SIZE)
+		end = PGDIR_SIZE;
+	phys_addr -= address;
+	if (address >= end)
+		BUG();
+	do {
+		pte_t * pte = pte_alloc_kernel(NULL, pmd, address);
+		if (!pte)
+			return -ENOMEM;
+		remap_area_pte(pte, address, end - address, address + phys_addr, flags);
+		address = (address + PMD_SIZE) & PMD_MASK;
+		pmd++;
+	} while (address && (address < end));
+	return 0;
+}
+
+#if (USE_HPPA_IOREMAP)
+static int remap_area_pages(unsigned long address, unsigned long phys_addr,
+				 unsigned long size, unsigned long flags)
+{
+	int error;
+	pgd_t * dir;
+	unsigned long end = address + size;
+
+	phys_addr -= address;
+	dir = pgd_offset(&init_mm, address);
+	flush_cache_all();
+	if (address >= end)
+		BUG();
+	spin_lock(&init_mm.page_table_lock);
+	do {
+		pmd_t *pmd;
+		pmd = pmd_alloc(dir, address);
+		error = -ENOMEM;
+		if (!pmd)
+			break;
+		if (remap_area_pmd(pmd, address, end - address,
+					 phys_addr + address, flags))
+			break;
+		error = 0;
+		address = (address + PGDIR_SIZE) & PGDIR_MASK;
+		dir++;
+	} while (address && (address < end));
+	spin_unlock(&init_mm.page_table_lock);
+	flush_tlb_all();
+	return error;
+}
+#endif /* USE_HPPA_IOREMAP */
+
+/*
+ * Generic mapping function (not visible outside):
+ */
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space. Needed when the kernel wants to access high addresses
+ * directly.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+void * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
+{
+#if !(USE_HPPA_IOREMAP)
+
+	unsigned long end = phys_addr + size - 1;
+	/* Support EISA addresses */
+	if ((phys_addr >= 0x00080000 && end < 0x000fffff)
+			|| (phys_addr >= 0x00500000 && end < 0x03bfffff)) {
+		phys_addr |= 0xfc000000;
+	}
+
+	return (void *)phys_addr;
+
+#else
+	void * addr;
+	struct vm_struct * area;
+	unsigned long offset, last_addr;
+
+	/* Don't allow wraparound or zero size */
+	last_addr = phys_addr + size - 1;
+	if (!size || last_addr < phys_addr)
+		return NULL;
+
+	/*
+	 * Don't allow anybody to remap normal RAM that we're using..
+	 */
+	if (phys_addr < virt_to_phys(high_memory)) {
+		char *t_addr, *t_end;
+		struct page *page;
+
+		t_addr = __va(phys_addr);
+		t_end = t_addr + (size - 1);
+	   
+		for(page = virt_to_page(t_addr); page <= virt_to_page(t_end); page++)
+			if(!PageReserved(page))
+				return NULL;
+	}
+
+	/*
+	 * Mappings have to be page-aligned
+	 */
+	offset = phys_addr & ~PAGE_MASK;
+	phys_addr &= PAGE_MASK;
+	size = PAGE_ALIGN(last_addr) - phys_addr;
+
+	/*
+	 * Ok, go for it..
+	 */
+	area = get_vm_area(size, VM_IOREMAP);
+	if (!area)
+		return NULL;
+	addr = area->addr;
+	if (remap_area_pages(VMALLOC_VMADDR(addr), phys_addr, size, flags)) {
+		vfree(addr);
+		return NULL;
+	}
+	return (void *) (offset + (char *)addr);
+#endif
+}
+
+void iounmap(void *addr)
+{
+#if !(USE_HPPA_IOREMAP)
+	return;
+#else
+	if (addr > high_memory)
+		return vfree((void *) (PAGE_MASK & (unsigned long) addr));
+#endif
+}

arch/parisc/mm/pa11.c

-/* $Id: pa11.c,v 1.1 1999/03/17 01:05:41 pjlahaie Exp $
- *
- * pa11.c: PA 1.1 specific mmu/cache code.
- *
- */
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-#include <asm/sgialib.h>
-#include <asm/mmu_context.h>
-
-extern unsigned long mips_tlb_entries;
-
-/* page functions */
-void pa11_clear_page(unsigned long page)
-{
-}
-
-static void pa11_copy_page(unsigned long to, unsigned long from)
-{
-}
-
-/* Cache operations. */
-static inline void pa11_flush_cache_all(void) { }
-static void pa11_flush_cache_mm(struct mm_struct *mm) { }
-static void pa11_flush_cache_range(struct vm_area_struct *vma,
-				    unsigned long start,
-				    unsigned long end)
-{
-}
-
-static void pa11_flush_cache_page(struct vm_area_struct *vma,
-				   unsigned long page)
-{
-}
-
-static void pa11_flush_page_to_ram(unsigned long page)
-{
-}
-
-static void pa11_flush_cache_sigtramp(unsigned long page)
-{
-}
-
-/* TLB operations. */
-static inline void pa11_flush_tlb_all(void)
-{
-	unsigned long flags;
-	int entry;
-
-	save_and_cli(flags);
-/* Here we will need to flush all the TLBs */
-	restore_flags(flags);
-}
-
-static void pa11_flush_tlb_mm(struct mm_struct *mm)
-{
-/* This is what the MIPS does..  Is it the right thing for PA-RISC? */
-	if(mm == current->mm)
-		pa11_flush_tlb_all();
-}
-
-static void pa11_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
-				  unsigned long end)
-{
-	if (vma == NULL || vma->vm_mm == current->mm)
-		pa11_flush_tlb_all();
-}
-
-static void pa11_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
-	if(vma->vm_mm == current->mm)
-		pa11_flush_tlb_all();
-}
-
-static void pa11_load_pgd(unsigned long pg_dir)
-{
-	unsigned long flags;
-    /* We need to do the right thing here */
-}
-
-/*
- * Initialize new page directory with pointers to invalid ptes
- */
-static void pa11_pgd_init(unsigned long page)
-{
-	unsigned long dummy1, dummy2;
-
-}
-
-static void pa11_update_mmu_cache(struct vm_area_struct * vma,
-				   unsigned long address, pte_t pte)
-{
-	pa11_flush_tlb_page(vma, address);
-}
-
-static void pa11_show_regs(struct pt_regs * regs)
-{
-	/*
-	 * Saved main processor registers
-	 */
-	printk("$0 : %08x %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
-	       0, (unsigned long) regs->regs[1], (unsigned long) regs->regs[2],
-	       (unsigned long) regs->regs[3], (unsigned long) regs->regs[4],
-	       (unsigned long) regs->regs[5], (unsigned long) regs->regs[6],
-	       (unsigned long) regs->regs[7]);
-	printk("$8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
-	       (unsigned long) regs->regs[8], (unsigned long) regs->regs[9],
-	       (unsigned long) regs->regs[10], (unsigned long) regs->regs[11],
-               (unsigned long) regs->regs[12], (unsigned long) regs->regs[13],
-	       (unsigned long) regs->regs[14], (unsigned long) regs->regs[15]);
-	printk("$16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
-	       (unsigned long) regs->regs[16], (unsigned long) regs->regs[17],
-	       (unsigned long) regs->regs[18], (unsigned long) regs->regs[19],
-               (unsigned long) regs->regs[20], (unsigned long) regs->regs[21],
-	       (unsigned long) regs->regs[22], (unsigned long) regs->regs[23]);
-	printk("$24: %08lx %08lx                   %08lx %08lx %08lx %08lx\n",
-	       (unsigned long) regs->regs[24], (unsigned long) regs->regs[25],
-	       (unsigned long) regs->regs[28], (unsigned long) regs->regs[29],
-               (unsigned long) regs->regs[30], (unsigned long) regs->regs[31]);
-
-	/*
-	 * Saved cp0 registers
-	 */
-	printk("epc  : %08lx    %s\nStatus: %08x\nCause : %08x\n",
-	       (unsigned long) regs->cp0_epc, print_tainted(),
-	       (unsigned int) regs->cp0_status,
-	       (unsigned int) regs->cp0_cause);
-}
-
-static int pa11_user_mode(struct pt_regs *regs)
-{
-       /* Return user mode stuff?? */
-}
-
-__initfunc(void ld_mmu_pa11(void))
-{
-
-    /* Taken directly from the MIPS arch..  Lots of bad things here */
-	clear_page = pa11_clear_page;
-	copy_page = pa11_copy_page;
-
-	flush_cache_all = pa11_flush_cache_all;
-	flush_cache_mm = pa11_flush_cache_mm;
-	flush_cache_range = pa11_flush_cache_range;
-	flush_cache_page = pa11_flush_cache_page;
-	flush_cache_sigtramp = pa11_flush_cache_sigtramp;
-	flush_page_to_ram = pa11_flush_page_to_ram;
-
-	flush_tlb_all = pa11_flush_tlb_all;
-	flush_tlb_mm = pa11_flush_tlb_mm;
-	flush_tlb_range = pa11_flush_tlb_range;
-	flush_tlb_page = pa11_flush_tlb_page;
-	pa11_asid_setup();
-
-	load_pgd = pa11_load_pgd;
-	pgd_init = pa11_pgd_init;
-	update_mmu_cache = pa11_update_mmu_cache;
-
-	show_regs = pa11_show_regs;
-    
-        add_wired_entry = pa11_add_wired_entry;
-
-	user_mode = pa11_user_mode;
-	flush_tlb_all();
-}

arch/parisc/mm/pa20.c

-/* $Id: pa20.c,v 1.1 1999/03/17 01:05:41 pjlahaie Exp $
- *
- * pa20.c: PA 2.0 specific mmu/cache code.
- *
- */
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-#include <asm/sgialib.h>
-#include <asm/mmu_context.h>
-
-extern unsigned long mips_tlb_entries;
-
-/* page functions */
-void pa20_clear_page(unsigned long page)
-{
-}
-
-static void pa20_copy_page(unsigned long to, unsigned long from)
-{
-}
-
-/* Cache operations. */
-static inline void pa20_flush_cache_all(void) { }
-static void pa20_flush_cache_mm(struct mm_struct *mm) { }
-static void pa20_flush_cache_range(struct vm_area_struct *vma,
-				    unsigned long start,
-				    unsigned long end)
-{
-}
-
-static void pa20_flush_cache_page(struct vm_area_struct *vma,
-				   unsigned long page)
-{
-}
-
-static void pa20_flush_page_to_ram(unsigned long page)
-{
-}
-
-static void pa20_flush_cache_sigtramp(unsigned long page)
-{
-}
-
-/* TLB operations. */
-static inline void pa20_flush_tlb_all(void)
-{
-	unsigned long flags;
-	int entry;
-
-	save_and_cli(flags);
-/* Here we will need to flush all the TLBs */
-	restore_flags(flags);
-}
-
-static void pa20_flush_tlb_mm(struct mm_struct *mm)
-{
-/* This is what the MIPS does..  Is it the right thing for PA-RISC? */
-	if(mm == current->mm)
-		pa20_flush_tlb_all();
-}
-
-static void pa20_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
-				  unsigned long end)
-{
-	if (vma == NULL || vma->vm_mm == current->mm)
-		pa20_flush_tlb_all();
-}
-
-static void pa20_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
-	if(vma->vm_mm == current->mm)
-		pa20_flush_tlb_all();
-}
-
-static void pa20_load_pgd(unsigned long pg_dir)
-{
-	unsigned long flags;
-    /* We need to do the right thing here */
-}
-
-/*
- * Initialize new page directory with pointers to invalid ptes
- */
-static void pa20_pgd_init(unsigned long page)
-{
-	unsigned long dummy1, dummy2;
-
-}
-
-static void pa20_update_mmu_cache(struct vm_area_struct * vma,
-				   unsigned long address, pte_t pte)
-{
-	pa20_flush_tlb_page(vma, address);
-}
-
-static void pa20_show_regs(struct pt_regs * regs)
-{
-	/*
-	 * Saved main processor registers
-	 */
-	printk("$0 : %08x %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
-	       0, (unsigned long) regs->regs[1], (unsigned long) regs->regs[2],
-	       (unsigned long) regs->regs[3], (unsigned long) regs->regs[4],
-	       (unsigned long) regs->regs[5], (unsigned long) regs->regs[6],
-	       (unsigned long) regs->regs[7]);
-	printk("$8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
-	       (unsigned long) regs->regs[8], (unsigned long) regs->regs[9],
-	       (unsigned long) regs->regs[10], (unsigned long) regs->regs[11],
-               (unsigned long) regs->regs[12], (unsigned long) regs->regs[13],
-	       (unsigned long) regs->regs[14], (unsigned long) regs->regs[15]);
-	printk("$16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
-	       (unsigned long) regs->regs[16], (unsigned long) regs->regs[17],
-	       (unsigned long) regs->regs[18], (unsigned long) regs->regs[19],
-               (unsigned long) regs->regs[20], (unsigned long) regs->regs[21],
-	       (unsigned long) regs->regs[22], (unsigned long) regs->regs[23]);
-	printk("$24: %08lx %08lx                   %08lx %08lx %08lx %08lx\n",
-	       (unsigned long) regs->regs[24], (unsigned long) regs->regs[25],
-	       (unsigned long) regs->regs[28], (unsigned long) regs->regs[29],
-               (unsigned long) regs->regs[30], (unsigned long) regs->regs[31]);
-
-	/*
-	 * Saved cp0 registers
-	 */
-	printk("epc  : %08lx    %s\nStatus: %08x\nCause : %08x\n",
-	       (unsigned long) regs->cp0_epc, print_tainted(),
-	       (unsigned int) regs->cp0_status,
-	       (unsigned int) regs->cp0_cause);
-}
-
-static int pa20_user_mode(struct pt_regs *regs)
-{
-       /* Return user mode stuff?? */
-}
-
-__initfunc(void ld_mmu_pa20(void))
-{
-
-    /* Taken directly from the MIPS arch..  Lots of bad things here */
-	clear_page = pa20_clear_page;
-	copy_page = pa20_copy_page;
-
-	flush_cache_all = pa20_flush_cache_all;
-	flush_cache_mm = pa20_flush_cache_mm;
-	flush_cache_range = pa20_flush_cache_range;
-	flush_cache_page = pa20_flush_cache_page;
-	flush_cache_sigtramp = pa20_flush_cache_sigtramp;
-	flush_page_to_ram = pa20_flush_page_to_ram;
-
-	flush_tlb_all = pa20_flush_tlb_all;
-	flush_tlb_mm = pa20_flush_tlb_mm;
-	flush_tlb_range = pa20_flush_tlb_range;
-	flush_tlb_page = pa20_flush_tlb_page;
-	pa20_asid_setup();
-
-	load_pgd = pa20_load_pgd;
-	pgd_init = pa20_pgd_init;
-	update_mmu_cache = pa20_update_mmu_cache;
-
-	show_regs = pa20_show_regs;
-    
-        add_wired_entry = pa20_add_wired_entry;
-
-	user_mode = pa20_user_mode;
-	flush_tlb_all();
-}