From efddb4c882a64b7ca44b2a089d20020b30a2c6dd Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Wed, 21 Nov 2007 22:30:58 +0900 Subject: sh: Rename the _32 and _64 TLB flush variants. Signed-off-by: Paul Mundt --- arch/sh/mm/Makefile_32 | 2 +- arch/sh/mm/Makefile_64 | 2 +- arch/sh/mm/tlb-flush_32.c | 140 -------------- arch/sh/mm/tlb-flush_64.c | 475 ---------------------------------------------- arch/sh/mm/tlbflush_32.c | 140 ++++++++++++++ arch/sh/mm/tlbflush_64.c | 475 ++++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 617 insertions(+), 617 deletions(-) delete mode 100644 arch/sh/mm/tlb-flush_32.c delete mode 100644 arch/sh/mm/tlb-flush_64.c create mode 100644 arch/sh/mm/tlbflush_32.c create mode 100644 arch/sh/mm/tlbflush_64.c (limited to 'arch/sh/mm') diff --git a/arch/sh/mm/Makefile_32 b/arch/sh/mm/Makefile_32 index fc089c0cdbe..095abd14592 100644 --- a/arch/sh/mm/Makefile_32 +++ b/arch/sh/mm/Makefile_32 @@ -12,7 +12,7 @@ obj-$(CONFIG_SH7705_CACHE_32KB) += cache-sh7705.o endif mmu-y := tlb-nommu.o pg-nommu.o -mmu-$(CONFIG_MMU) := fault_32.o clear_page.o copy_page.o tlb-flush_32.o \ +mmu-$(CONFIG_MMU) := fault_32.o clear_page.o copy_page.o tlbflush_32.o \ ioremap_32.o obj-y += $(mmu-y) diff --git a/arch/sh/mm/Makefile_64 b/arch/sh/mm/Makefile_64 index 2731cf1c4e0..cbd6aa33c5a 100644 --- a/arch/sh/mm/Makefile_64 +++ b/arch/sh/mm/Makefile_64 @@ -5,7 +5,7 @@ obj-y := init.o extable_64.o consistent.o mmu-y := tlb-nommu.o pg-nommu.o -mmu-$(CONFIG_MMU) := fault_64.o ioremap_64.o tlb-flush_64.o tlb-sh5.o +mmu-$(CONFIG_MMU) := fault_64.o ioremap_64.o tlbflush_64.o tlb-sh5.o ifndef CONFIG_CACHE_OFF obj-y += cache-sh5.o diff --git a/arch/sh/mm/tlb-flush_32.c b/arch/sh/mm/tlb-flush_32.c deleted file mode 100644 index 6f45c1f8a7f..00000000000 --- a/arch/sh/mm/tlb-flush_32.c +++ /dev/null @@ -1,140 +0,0 @@ -/* - * 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 -#include -#include - -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); -} diff --git a/arch/sh/mm/tlb-flush_64.c b/arch/sh/mm/tlb-flush_64.c deleted file mode 100644 index 2a98c9ec88f..00000000000 --- a/arch/sh/mm/tlb-flush_64.c +++ /dev/null @@ -1,475 +0,0 @@ -/* - * 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -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(); -} diff --git a/arch/sh/mm/tlbflush_32.c b/arch/sh/mm/tlbflush_32.c new file mode 100644 index 00000000000..6f45c1f8a7f --- /dev/null +++ b/arch/sh/mm/tlbflush_32.c @@ -0,0 +1,140 @@ +/* + * 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 +#include +#include + +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); +} diff --git a/arch/sh/mm/tlbflush_64.c b/arch/sh/mm/tlbflush_64.c new file mode 100644 index 00000000000..2a98c9ec88f --- /dev/null +++ b/arch/sh/mm/tlbflush_64.c @@ -0,0 +1,475 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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(); +} -- cgit v1.2.3