sh: Split out tlb-flush in to _32 and _64 variants.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 0 insertions, 602 deletions

diff --git a/arch/sh64/mm/fault.c b/arch/sh64/mm/fault.c
deleted file mode 100644
index 7c79a1b..0000000
--- a/arch/sh64/mm/fault.c
+++ /dev/null
@@ -1,602 +0,0 @@
-/*
- * 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.
- *
- * arch/sh64/mm/fault.c
- *
- * Copyright (C) 2000, 2001  Paolo Alberelli
- * Copyright (C) 2003  Richard Curnow (/proc/tlb, bug fixes)
- * Copyright (C) 2003  Paul Mundt
- *
- */
-
-#include <linux/signal.h>
-#include <linux/rwsem.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/ptrace.h>
-#include <linux/mman.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/interrupt.h>
-
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/tlb.h>
-#include <asm/uaccess.h>
-#include <asm/pgalloc.h>
-#include <asm/mmu_context.h>
-#include <asm/registers.h>		/* required by inline asm statements */
-
-#if defined(CONFIG_SH64_PROC_TLB)
-#include <linux/init.h>
-#include <linux/proc_fs.h>
-/* Count numbers of tlb refills in each region */
-static unsigned long long calls_to_update_mmu_cache = 0ULL;
-static unsigned long long calls_to_flush_tlb_page   = 0ULL;
-static unsigned long long calls_to_flush_tlb_range  = 0ULL;
-static unsigned long long calls_to_flush_tlb_mm     = 0ULL;
-static unsigned long long calls_to_flush_tlb_all    = 0ULL;
-unsigned long long calls_to_do_slow_page_fault = 0ULL;
-unsigned long long calls_to_do_fast_page_fault = 0ULL;
-
-/* Count size of ranges for flush_tlb_range */
-static unsigned long long flush_tlb_range_1         = 0ULL;
-static unsigned long long flush_tlb_range_2         = 0ULL;
-static unsigned long long flush_tlb_range_3_4       = 0ULL;
-static unsigned long long flush_tlb_range_5_7       = 0ULL;
-static unsigned long long flush_tlb_range_8_11      = 0ULL;
-static unsigned long long flush_tlb_range_12_15     = 0ULL;
-static unsigned long long flush_tlb_range_16_up     = 0ULL;
-
-static unsigned long long page_not_present          = 0ULL;
-
-#endif
-
-extern void die(const char *,struct pt_regs *,long);
-
-#define PFLAG(val,flag)   (( (val) & (flag) ) ? #flag : "" )
-#define PPROT(flag) PFLAG(pgprot_val(prot),flag)
-
-static inline void print_prots(pgprot_t prot)
-{
-	printk("prot is 0x%08lx\n",pgprot_val(prot));
-
-	printk("%s %s %s %s %s\n",PPROT(_PAGE_SHARED),PPROT(_PAGE_READ),
-	       PPROT(_PAGE_EXECUTE),PPROT(_PAGE_WRITE),PPROT(_PAGE_USER));
-}
-
-static inline void print_vma(struct vm_area_struct *vma)
-{
-	printk("vma start 0x%08lx\n", vma->vm_start);
-	printk("vma end   0x%08lx\n", vma->vm_end);
-
-	print_prots(vma->vm_page_prot);
-	printk("vm_flags 0x%08lx\n", vma->vm_flags);
-}
-
-static inline void print_task(struct task_struct *tsk)
-{
-	printk("Task pid %d\n", task_pid_nr(tsk));
-}
-
-static pte_t *lookup_pte(struct mm_struct *mm, unsigned long address)
-{
-	pgd_t *dir;
-	pmd_t *pmd;
-	pte_t *pte;
-	pte_t entry;
-
-	dir = pgd_offset(mm, address);
-	if (pgd_none(*dir)) {
-		return NULL;
-	}
-
-	pmd = pmd_offset(dir, address);
-	if (pmd_none(*pmd)) {
-		return NULL;
-	}
-
-	pte = pte_offset_kernel(pmd, address);
-	entry = *pte;
-
-	if (pte_none(entry)) {
-		return NULL;
-	}
-	if (!pte_present(entry)) {
-		return NULL;
-	}
-
-	return pte;
-}
-
-/*
- * This routine handles page faults.  It determines the address,
- * and the problem, and then passes it off to one of the appropriate
- * routines.
- */
-asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess,
-			      unsigned long textaccess, unsigned long address)
-{
-	struct task_struct *tsk;
-	struct mm_struct *mm;
-	struct vm_area_struct * vma;
-	const struct exception_table_entry *fixup;
-	pte_t *pte;
-	int fault;
-
-#if defined(CONFIG_SH64_PROC_TLB)
-        ++calls_to_do_slow_page_fault;
-#endif
-
-	/* SIM
-	 * Note this is now called with interrupts still disabled
-	 * This is to cope with being called for a missing IO port
-	 * address with interrupts disabled. This should be fixed as
-	 * soon as we have a better 'fast path' miss handler.
-	 *
-	 * Plus take care how you try and debug this stuff.
-	 * For example, writing debug data to a port which you
-	 * have just faulted on is not going to work.
-	 */
-
-	tsk = current;
-	mm = tsk->mm;
-
-	/* Not an IO address, so reenable interrupts */
-	local_irq_enable();
-
-	/*
-	 * If we're in an interrupt or have no user
-	 * context, we must not take the fault..
-	 */
-	if (in_atomic() || !mm)
-		goto no_context;
-
-	/* TLB misses upon some cache flushes get done under cli() */
-	down_read(&mm->mmap_sem);
-
-	vma = find_vma(mm, address);
-
-	if (!vma) {
-#ifdef DEBUG_FAULT
-		print_task(tsk);
-		printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n",
-		       __FUNCTION__,__LINE__,
-		       address,regs->pc,textaccess,writeaccess);
-		show_regs(regs);
-#endif
-		goto bad_area;
-	}
-	if (vma->vm_start <= address) {
-		goto good_area;
-	}
-
-	if (!(vma->vm_flags & VM_GROWSDOWN)) {
-#ifdef DEBUG_FAULT
-		print_task(tsk);
-		printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n",
-		       __FUNCTION__,__LINE__,
-		       address,regs->pc,textaccess,writeaccess);
-		show_regs(regs);
-
-		print_vma(vma);
-#endif
-		goto bad_area;
-	}
-	if (expand_stack(vma, address)) {
-#ifdef DEBUG_FAULT
-		print_task(tsk);
-		printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n",
-		       __FUNCTION__,__LINE__,
-		       address,regs->pc,textaccess,writeaccess);
-		show_regs(regs);
-#endif
-		goto bad_area;
-	}
-/*
- * Ok, we have a good vm_area for this memory access, so
- * we can handle it..
- */
-good_area:
-	if (textaccess) {
-		if (!(vma->vm_flags & VM_EXEC))
-			goto bad_area;
-	} else {
-		if (writeaccess) {
-			if (!(vma->vm_flags & VM_WRITE))
-				goto bad_area;
-		} else {
-			if (!(vma->vm_flags & VM_READ))
-				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.
-	 */
-survive:
-	fault = handle_mm_fault(mm, vma, address, writeaccess);
-	if (unlikely(fault & VM_FAULT_ERROR)) {
-		if (fault & VM_FAULT_OOM)
-			goto out_of_memory;
-		else if (fault & VM_FAULT_SIGBUS)
-			goto do_sigbus;
-		BUG();
-	}
-	if (fault & VM_FAULT_MAJOR)
-		tsk->maj_flt++;
-	else
-		tsk->min_flt++;
-
-	/* If we get here, the page fault has been handled.  Do the TLB refill
-	   now from the newly-setup PTE, to avoid having to fault again right
-	   away on the same instruction. */
-	pte = lookup_pte (mm, address);
-	if (!pte) {
-		/* From empirical evidence, we can get here, due to
-		   !pte_present(pte).  (e.g. if a swap-in occurs, and the page
-		   is swapped back out again before the process that wanted it
-		   gets rescheduled?) */
-		goto no_pte;
-	}
-
-	__do_tlb_refill(address, textaccess, pte);
-
-no_pte:
-
-	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:
-#ifdef DEBUG_FAULT
-	printk("fault:bad area\n");
-#endif
-	up_read(&mm->mmap_sem);
-
-	if (user_mode(regs)) {
-		static int count=0;
-		siginfo_t info;
-		if (count < 4) {
-			/* This is really to help debug faults when starting
-			 * usermode, so only need a few */
-			count++;
-			printk("user mode bad_area address=%08lx pid=%d (%s) pc=%08lx\n",
-				address, task_pid_nr(current), current->comm,
-				(unsigned long) regs->pc);
-#if 0
-			show_regs(regs);
-#endif
-		}
-		if (is_global_init(tsk)) {
-			panic("INIT had user mode bad_area\n");
-		}
-		tsk->thread.address = address;
-		tsk->thread.error_code = writeaccess;
-		info.si_signo = SIGSEGV;
-		info.si_errno = 0;
-		info.si_addr = (void *) address;
-		force_sig_info(SIGSEGV, &info, tsk);
-		return;
-	}
-
-no_context:
-#ifdef DEBUG_FAULT
-	printk("fault:No context\n");
-#endif
-	/* Are we prepared to handle this kernel fault?  */
-	fixup = search_exception_tables(regs->pc);
-	if (fixup) {
-		regs->pc = fixup->fixup;
-		return;
-	}
-
-/*
- * Oops. The kernel tried to access some bad page. We'll have to
- * terminate things with extreme prejudice.
- *
- */
-	if (address < PAGE_SIZE)
-		printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
-	else
-		printk(KERN_ALERT "Unable to handle kernel paging request");
-	printk(" at virtual address %08lx\n", address);
-	printk(KERN_ALERT "pc = %08Lx%08Lx\n", regs->pc >> 32, regs->pc & 0xffffffff);
-	die("Oops", regs, writeaccess);
-	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:
-	if (is_global_init(current)) {
-		panic("INIT out of memory\n");
-		yield();
-		goto survive;
-	}
-	printk("fault:Out of memory\n");
-	up_read(&mm->mmap_sem);
-	if (is_global_init(current)) {
-		yield();
-		down_read(&mm->mmap_sem);
-		goto survive;
-	}
-	printk("VM: killing process %s\n", tsk->comm);
-	if (user_mode(regs))
-		do_group_exit(SIGKILL);
-	goto no_context;
-
-do_sigbus:
-	printk("fault:Do sigbus\n");
-	up_read(&mm->mmap_sem);
-
-	/*
-	 * Send a sigbus, regardless of whether we were in kernel
-	 * or user mode.
-	 */
-	tsk->thread.address = address;
-	tsk->thread.error_code = writeaccess;
-	tsk->thread.trap_no = 14;
-	force_sig(SIGBUS, tsk);
-
-	/* Kernel mode? Handle exceptions or die */
-	if (!user_mode(regs))
-		goto no_context;
-}
-
-
-void flush_tlb_all(void);
-
-void update_mmu_cache(struct vm_area_struct * vma,
-			unsigned long address, pte_t pte)
-{
-#if defined(CONFIG_SH64_PROC_TLB)
-	++calls_to_update_mmu_cache;
-#endif
-
-	/*
-	 * This appears to get called once for every pte entry that gets
-	 * established => I don't think it's efficient to try refilling the
-	 * TLBs with the pages - some may not get accessed even.  Also, for
-	 * executable pages, it is impossible to determine reliably here which
-	 * TLB they should be mapped into (or both even).
-	 *
-	 * So, just do nothing here and handle faults on demand.  In the
-	 * TLBMISS handling case, the refill is now done anyway after the pte
-	 * has been fixed up, so that deals with most useful cases.
-	 */
-}
-
-static void __flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
-	unsigned long long match, pteh=0, lpage;
-	unsigned long tlb;
-	struct mm_struct *mm;
-
-	mm = vma->vm_mm;
-
-	if (mm->context == NO_CONTEXT)
-		return;
-
-	/*
-	 * Sign-extend based on neff.
-	 */
-	lpage = (page & NEFF_SIGN) ? (page | NEFF_MASK) : page;
-	match = ((mm->context & MMU_CONTEXT_ASID_MASK) << PTEH_ASID_SHIFT) | PTEH_VALID;
-	match |= lpage;
-
-        /* Do ITLB : don't bother for pages in non-exectutable VMAs */
-	if (vma->vm_flags & VM_EXEC) {
-		for_each_itlb_entry(tlb) {
-			asm volatile ("getcfg	%1, 0, %0"
-				      : "=r" (pteh)
-				      : "r" (tlb) );
-
-			if (pteh == match) {
-				__flush_tlb_slot(tlb);
-				break;
-			}
-
-		}
-	}
-
-        /* Do DTLB : any page could potentially be in here. */
-	for_each_dtlb_entry(tlb) {
-		asm volatile ("getcfg	%1, 0, %0"
-			      : "=r" (pteh)
-			      : "r" (tlb) );
-
-		if (pteh == match) {
-			__flush_tlb_slot(tlb);
-			break;
-		}
-
-	}
-}
-
-void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
-	unsigned long flags;
-
-#if defined(CONFIG_SH64_PROC_TLB)
-        ++calls_to_flush_tlb_page;
-#endif
-
-	if (vma->vm_mm) {
-		page &= PAGE_MASK;
-		local_irq_save(flags);
-		__flush_tlb_page(vma, page);
-		local_irq_restore(flags);
-	}
-}
-
-void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
-		     unsigned long end)
-{
-	unsigned long flags;
-	unsigned long long match, pteh=0, pteh_epn, pteh_low;
-	unsigned long tlb;
-	struct mm_struct *mm;
-
-	mm = vma->vm_mm;
-
-#if defined(CONFIG_SH64_PROC_TLB)
-	++calls_to_flush_tlb_range;
-
-	{
-		unsigned long size = (end - 1) - start;
-		size >>= 12; /* divide by PAGE_SIZE */
-		size++; /* end=start+4096 => 1 page */
-		switch (size) {
-		  case  1        : flush_tlb_range_1++;     break;
-		  case  2        : flush_tlb_range_2++;     break;
-		  case  3 ...  4 : flush_tlb_range_3_4++;   break;
-		  case  5 ...  7 : flush_tlb_range_5_7++;   break;
-		  case  8 ... 11 : flush_tlb_range_8_11++;  break;
-		  case 12 ... 15 : flush_tlb_range_12_15++; break;
-		  default        : flush_tlb_range_16_up++; break;
-		}
-	}
-#endif
-
-	if (mm->context == NO_CONTEXT)
-		return;
-
-	local_irq_save(flags);
-
-	start &= PAGE_MASK;
-	end &= PAGE_MASK;
-
-	match = ((mm->context & MMU_CONTEXT_ASID_MASK) << PTEH_ASID_SHIFT) | PTEH_VALID;
-
-	/* Flush ITLB */
-	for_each_itlb_entry(tlb) {
-		asm volatile ("getcfg	%1, 0, %0"
-			      : "=r" (pteh)
-			      : "r" (tlb) );
-
-		pteh_epn = pteh & PAGE_MASK;
-		pteh_low = pteh & ~PAGE_MASK;
-
-		if (pteh_low == match && pteh_epn >= start && pteh_epn <= end)
-			__flush_tlb_slot(tlb);
-	}
-
-	/* Flush DTLB */
-	for_each_dtlb_entry(tlb) {
-		asm volatile ("getcfg	%1, 0, %0"
-			      : "=r" (pteh)
-			      : "r" (tlb) );
-
-		pteh_epn = pteh & PAGE_MASK;
-		pteh_low = pteh & ~PAGE_MASK;
-
-		if (pteh_low == match && pteh_epn >= start && pteh_epn <= end)
-			__flush_tlb_slot(tlb);
-	}
-
-	local_irq_restore(flags);
-}
-
-void flush_tlb_mm(struct mm_struct *mm)
-{
-	unsigned long flags;
-
-#if defined(CONFIG_SH64_PROC_TLB)
-	++calls_to_flush_tlb_mm;
-#endif
-
-	if (mm->context == NO_CONTEXT)
-		return;
-
-	local_irq_save(flags);
-
-	mm->context=NO_CONTEXT;
-	if(mm==current->mm)
-		activate_context(mm);
-
-	local_irq_restore(flags);
-
-}
-
-void flush_tlb_all(void)
-{
-	/* Invalidate all, including shared pages, excluding fixed TLBs */
-
-	unsigned long flags, tlb;
-
-#if defined(CONFIG_SH64_PROC_TLB)
-	++calls_to_flush_tlb_all;
-#endif
-
-	local_irq_save(flags);
-
-	/* Flush each ITLB entry */
-	for_each_itlb_entry(tlb) {
-		__flush_tlb_slot(tlb);
-	}
-
-	/* Flush each DTLB entry */
-	for_each_dtlb_entry(tlb) {
-		__flush_tlb_slot(tlb);
-	}
-
-	local_irq_restore(flags);
-}
-
-void flush_tlb_kernel_range(unsigned long start, unsigned long end)
-{
-        /* FIXME: Optimize this later.. */
-        flush_tlb_all();
-}
-
-#if defined(CONFIG_SH64_PROC_TLB)
-/* Procfs interface to read the performance information */
-
-static int
-tlb_proc_info(char *buf, char **start, off_t fpos, int length, int *eof, void *data)
-{
-  int len=0;
-  len += sprintf(buf+len, "do_fast_page_fault   called %12lld times\n", calls_to_do_fast_page_fault);
-  len += sprintf(buf+len, "do_slow_page_fault   called %12lld times\n", calls_to_do_slow_page_fault);
-  len += sprintf(buf+len, "update_mmu_cache     called %12lld times\n", calls_to_update_mmu_cache);
-  len += sprintf(buf+len, "flush_tlb_page       called %12lld times\n", calls_to_flush_tlb_page);
-  len += sprintf(buf+len, "flush_tlb_range      called %12lld times\n", calls_to_flush_tlb_range);
-  len += sprintf(buf+len, "flush_tlb_mm         called %12lld times\n", calls_to_flush_tlb_mm);
-  len += sprintf(buf+len, "flush_tlb_all        called %12lld times\n", calls_to_flush_tlb_all);
-  len += sprintf(buf+len, "flush_tlb_range_sizes\n"
-                          " 1      : %12lld\n"
-                          " 2      : %12lld\n"
-                          " 3 -  4 : %12lld\n"
-                          " 5 -  7 : %12lld\n"
-                          " 8 - 11 : %12lld\n"
-                          "12 - 15 : %12lld\n"
-                          "16+     : %12lld\n",
-                          flush_tlb_range_1, flush_tlb_range_2, flush_tlb_range_3_4,
-                          flush_tlb_range_5_7, flush_tlb_range_8_11, flush_tlb_range_12_15,
-                          flush_tlb_range_16_up);
-  len += sprintf(buf+len, "page not present           %12lld times\n", page_not_present);
-  *eof = 1;
-  return len;
-}
-
-static int __init register_proc_tlb(void)
-{
-  create_proc_read_entry("tlb", 0, NULL, tlb_proc_info, NULL);
-  return 0;
-}
-
-__initcall(register_proc_tlb);
-
-#endif