endif
mmu-y := tlb-nommu.o pg-nommu.o
-mmu-$(CONFIG_MMU) := fault.o clear_page.o copy_page.o tlb-flush.o \
+mmu-$(CONFIG_MMU) := fault.o clear_page.o copy_page.o tlb-flush_32.o \
ioremap_32.o
obj-y += $(mmu-y)
obj-y := init.o extable_64.o consistent.o
mmu-y := tlb-nommu.o pg-nommu.o
-mmu-$(CONFIG_MMU) := ioremap_64.o
+mmu-$(CONFIG_MMU) := ioremap_64.o tlb-flush_64.o
obj-y += $(mmu-y)
+++ /dev/null
-/*
- * TLB flushing operations for SH with an MMU.
- *
- * Copyright (C) 1999 Niibe Yutaka
- * Copyright (C) 2003 Paul Mundt
- *
- * 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.
- */
-#include <linux/mm.h>
-#include <asm/mmu_context.h>
-#include <asm/tlbflush.h>
-
-void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
- unsigned int cpu = smp_processor_id();
-
- if (vma->vm_mm && cpu_context(cpu, vma->vm_mm) != NO_CONTEXT) {
- unsigned long flags;
- unsigned long asid;
- unsigned long saved_asid = MMU_NO_ASID;
-
- asid = cpu_asid(cpu, vma->vm_mm);
- page &= PAGE_MASK;
-
- local_irq_save(flags);
- if (vma->vm_mm != current->mm) {
- saved_asid = get_asid();
- set_asid(asid);
- }
- local_flush_tlb_one(asid, page);
- if (saved_asid != MMU_NO_ASID)
- set_asid(saved_asid);
- local_irq_restore(flags);
- }
-}
-
-void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
- unsigned long end)
-{
- struct mm_struct *mm = vma->vm_mm;
- unsigned int cpu = smp_processor_id();
-
- if (cpu_context(cpu, mm) != NO_CONTEXT) {
- unsigned long flags;
- int size;
-
- local_irq_save(flags);
- size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
- if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
- cpu_context(cpu, mm) = NO_CONTEXT;
- if (mm == current->mm)
- activate_context(mm, cpu);
- } else {
- unsigned long asid;
- unsigned long saved_asid = MMU_NO_ASID;
-
- asid = cpu_asid(cpu, mm);
- start &= PAGE_MASK;
- end += (PAGE_SIZE - 1);
- end &= PAGE_MASK;
- if (mm != current->mm) {
- saved_asid = get_asid();
- set_asid(asid);
- }
- while (start < end) {
- local_flush_tlb_one(asid, start);
- start += PAGE_SIZE;
- }
- if (saved_asid != MMU_NO_ASID)
- set_asid(saved_asid);
- }
- local_irq_restore(flags);
- }
-}
-
-void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
-{
- unsigned int cpu = smp_processor_id();
- unsigned long flags;
- int size;
-
- local_irq_save(flags);
- size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
- if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
- local_flush_tlb_all();
- } else {
- unsigned long asid;
- unsigned long saved_asid = get_asid();
-
- asid = cpu_asid(cpu, &init_mm);
- start &= PAGE_MASK;
- end += (PAGE_SIZE - 1);
- end &= PAGE_MASK;
- set_asid(asid);
- while (start < end) {
- local_flush_tlb_one(asid, start);
- start += PAGE_SIZE;
- }
- set_asid(saved_asid);
- }
- local_irq_restore(flags);
-}
-
-void local_flush_tlb_mm(struct mm_struct *mm)
-{
- unsigned int cpu = smp_processor_id();
-
- /* Invalidate all TLB of this process. */
- /* Instead of invalidating each TLB, we get new MMU context. */
- if (cpu_context(cpu, mm) != NO_CONTEXT) {
- unsigned long flags;
-
- local_irq_save(flags);
- cpu_context(cpu, mm) = NO_CONTEXT;
- if (mm == current->mm)
- activate_context(mm, cpu);
- local_irq_restore(flags);
- }
-}
-
-void local_flush_tlb_all(void)
-{
- unsigned long flags, status;
-
- /*
- * Flush all the TLB.
- *
- * Write to the MMU control register's bit:
- * TF-bit for SH-3, TI-bit for SH-4.
- * It's same position, bit #2.
- */
- local_irq_save(flags);
- status = ctrl_inl(MMUCR);
- status |= 0x04;
- ctrl_outl(status, MMUCR);
- ctrl_barrier();
- local_irq_restore(flags);
-}
--- /dev/null
+/*
+ * TLB flushing operations for SH with an MMU.
+ *
+ * Copyright (C) 1999 Niibe Yutaka
+ * Copyright (C) 2003 Paul Mundt
+ *
+ * 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.
+ */
+#include <linux/mm.h>
+#include <asm/mmu_context.h>
+#include <asm/tlbflush.h>
+
+void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
+{
+ unsigned int cpu = smp_processor_id();
+
+ if (vma->vm_mm && cpu_context(cpu, vma->vm_mm) != NO_CONTEXT) {
+ unsigned long flags;
+ unsigned long asid;
+ unsigned long saved_asid = MMU_NO_ASID;
+
+ asid = cpu_asid(cpu, vma->vm_mm);
+ page &= PAGE_MASK;
+
+ local_irq_save(flags);
+ if (vma->vm_mm != current->mm) {
+ saved_asid = get_asid();
+ set_asid(asid);
+ }
+ local_flush_tlb_one(asid, page);
+ if (saved_asid != MMU_NO_ASID)
+ set_asid(saved_asid);
+ local_irq_restore(flags);
+ }
+}
+
+void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ struct mm_struct *mm = vma->vm_mm;
+ unsigned int cpu = smp_processor_id();
+
+ if (cpu_context(cpu, mm) != NO_CONTEXT) {
+ unsigned long flags;
+ int size;
+
+ local_irq_save(flags);
+ size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
+ if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
+ cpu_context(cpu, mm) = NO_CONTEXT;
+ if (mm == current->mm)
+ activate_context(mm, cpu);
+ } else {
+ unsigned long asid;
+ unsigned long saved_asid = MMU_NO_ASID;
+
+ asid = cpu_asid(cpu, mm);
+ start &= PAGE_MASK;
+ end += (PAGE_SIZE - 1);
+ end &= PAGE_MASK;
+ if (mm != current->mm) {
+ saved_asid = get_asid();
+ set_asid(asid);
+ }
+ while (start < end) {
+ local_flush_tlb_one(asid, start);
+ start += PAGE_SIZE;
+ }
+ if (saved_asid != MMU_NO_ASID)
+ set_asid(saved_asid);
+ }
+ local_irq_restore(flags);
+ }
+}
+
+void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ unsigned int cpu = smp_processor_id();
+ unsigned long flags;
+ int size;
+
+ local_irq_save(flags);
+ size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
+ if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
+ local_flush_tlb_all();
+ } else {
+ unsigned long asid;
+ unsigned long saved_asid = get_asid();
+
+ asid = cpu_asid(cpu, &init_mm);
+ start &= PAGE_MASK;
+ end += (PAGE_SIZE - 1);
+ end &= PAGE_MASK;
+ set_asid(asid);
+ while (start < end) {
+ local_flush_tlb_one(asid, start);
+ start += PAGE_SIZE;
+ }
+ set_asid(saved_asid);
+ }
+ local_irq_restore(flags);
+}
+
+void local_flush_tlb_mm(struct mm_struct *mm)
+{
+ unsigned int cpu = smp_processor_id();
+
+ /* Invalidate all TLB of this process. */
+ /* Instead of invalidating each TLB, we get new MMU context. */
+ if (cpu_context(cpu, mm) != NO_CONTEXT) {
+ unsigned long flags;
+
+ local_irq_save(flags);
+ cpu_context(cpu, mm) = NO_CONTEXT;
+ if (mm == current->mm)
+ activate_context(mm, cpu);
+ local_irq_restore(flags);
+ }
+}
+
+void local_flush_tlb_all(void)
+{
+ unsigned long flags, status;
+
+ /*
+ * Flush all the TLB.
+ *
+ * Write to the MMU control register's bit:
+ * TF-bit for SH-3, TI-bit for SH-4.
+ * It's same position, bit #2.
+ */
+ local_irq_save(flags);
+ status = ctrl_inl(MMUCR);
+ status |= 0x04;
+ ctrl_outl(status, MMUCR);
+ ctrl_barrier();
+ local_irq_restore(flags);
+}
--- /dev/null
+/*
+ * arch/sh/mm/tlb-flush_64.c
+ *
+ * Copyright (C) 2000, 2001 Paolo Alberelli
+ * Copyright (C) 2003 Richard Curnow (/proc/tlb, bug fixes)
+ * Copyright (C) 2003 Paul Mundt
+ *
+ * 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.
+ */
+#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>
+
+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;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ pte_t entry;
+
+ dir = pgd_offset(mm, address);
+ if (pgd_none(*dir))
+ return NULL;
+
+ pud = pud_offset(dir, address);
+ if (pud_none(*pud))
+ return NULL;
+
+ pmd = pmd_offset(pud, address);
+ if (pmd_none(*pmd))
+ return NULL;
+
+ pte = pte_offset_kernel(pmd, address);
+ entry = *pte;
+ if (pte_none(entry) || !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;
+
+ /* 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 update_mmu_cache(struct vm_area_struct * vma,
+ unsigned long address, pte_t pte)
+{
+ /*
+ * 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.
+ */
+}
+
+void local_flush_tlb_one(unsigned long asid, unsigned long page)
+{
+ unsigned long long match, pteh=0, lpage;
+ unsigned long tlb;
+
+ /*
+ * Sign-extend based on neff.
+ */
+ lpage = (page & NEFF_SIGN) ? (page | NEFF_MASK) : page;
+ match = (asid << PTEH_ASID_SHIFT) | PTEH_VALID;
+ match |= lpage;
+
+ for_each_itlb_entry(tlb) {
+ asm volatile ("getcfg %1, 0, %0"
+ : "=r" (pteh)
+ : "r" (tlb) );
+
+ if (pteh == match) {
+ __flush_tlb_slot(tlb);
+ break;
+ }
+ }
+
+ for_each_dtlb_entry(tlb) {
+ asm volatile ("getcfg %1, 0, %0"
+ : "=r" (pteh)
+ : "r" (tlb) );
+
+ if (pteh == match) {
+ __flush_tlb_slot(tlb);
+ break;
+ }
+
+ }
+}
+
+void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
+{
+ unsigned long flags;
+
+ if (vma->vm_mm) {
+ page &= PAGE_MASK;
+ local_irq_save(flags);
+ local_flush_tlb_one(get_asid(), page);
+ local_irq_restore(flags);
+ }
+}
+
+void local_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;
+ unsigned int cpu = smp_processor_id();
+ struct mm_struct *mm;
+
+ mm = vma->vm_mm;
+ if (cpu_context(cpu, mm) == NO_CONTEXT)
+ return;
+
+ local_irq_save(flags);
+
+ start &= PAGE_MASK;
+ end &= PAGE_MASK;
+
+ match = (cpu_asid(cpu, mm) << 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 local_flush_tlb_mm(struct mm_struct *mm)
+{
+ unsigned long flags;
+ unsigned int cpu = smp_processor_id();
+
+ if (cpu_context(cpu, mm) == NO_CONTEXT)
+ return;
+
+ local_irq_save(flags);
+
+ cpu_context(cpu, mm) = NO_CONTEXT;
+ if (mm == current->mm)
+ activate_context(mm, cpu);
+
+ local_irq_restore(flags);
+}
+
+void local_flush_tlb_all(void)
+{
+ /* Invalidate all, including shared pages, excluding fixed TLBs */
+ unsigned long flags, tlb;
+
+ 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 local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ /* FIXME: Optimize this later.. */
+ flush_tlb_all();
+}
+++ /dev/null
-/*
- * 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
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff