mirror of https://gitee.com/openkylin/linux.git
sh: Move in the SH-5 TLB miss.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
parent
379a95d1d2
commit
811d50cb43
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@ -12,7 +12,7 @@ obj-$(CONFIG_SH7705_CACHE_32KB) += cache-sh7705.o
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endif
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mmu-y := tlb-nommu.o pg-nommu.o
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mmu-$(CONFIG_MMU) := fault.o clear_page.o copy_page.o tlb-flush_32.o \
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mmu-$(CONFIG_MMU) := fault_32.o clear_page.o copy_page.o tlb-flush_32.o \
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ioremap_32.o
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obj-y += $(mmu-y)
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@ -5,7 +5,7 @@
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obj-y := init.o extable_64.o consistent.o
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mmu-y := tlb-nommu.o pg-nommu.o
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mmu-$(CONFIG_MMU) := ioremap_64.o tlb-flush_64.o
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mmu-$(CONFIG_MMU) := fault_64.o ioremap_64.o tlb-flush_64.o
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obj-y += $(mmu-y)
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@ -1,9 +1,5 @@
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* arch/sh64/mm/tlbmiss.c
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* The SH64 TLB miss.
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*
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* Original code from fault.c
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* Copyright (C) 2000, 2001 Paolo Alberelli
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@ -12,16 +8,20 @@
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* Copyright (C) 2003 Richard.Curnow@superh.com
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*
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* IMPORTANT NOTES :
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* The do_fast_page_fault function is called from a context in entry.S where very few registers
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* have been saved. In particular, the code in this file must be compiled not to use ANY
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* caller-save registers that are not part of the restricted save set. Also, it means that
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* code in this file must not make calls to functions elsewhere in the kernel, or else the
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* excepting context will see corruption in its caller-save registers. Plus, the entry.S save
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* area is non-reentrant, so this code has to run with SR.BL==1, i.e. no interrupts taken inside
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* it and panic on any exception.
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* The do_fast_page_fault function is called from a context in entry.S
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* where very few registers have been saved. In particular, the code in
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* this file must be compiled not to use ANY caller-save registers that
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* are not part of the restricted save set. Also, it means that code in
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* this file must not make calls to functions elsewhere in the kernel, or
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* else the excepting context will see corruption in its caller-save
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* registers. Plus, the entry.S save area is non-reentrant, so this code
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* has to run with SR.BL==1, i.e. no interrupts taken inside it and panic
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* on any exception.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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@ -33,14 +33,13 @@
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <asm/system.h>
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#include <asm/tlb.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/registers.h> /* required by inline asm statements */
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#include <asm/cpu/registers.h>
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/* Callable from fault.c, so not static */
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inline void __do_tlb_refill(unsigned long address,
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@ -88,48 +87,47 @@ inline void __do_tlb_refill(unsigned long address,
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}
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static int handle_vmalloc_fault(struct mm_struct *mm, unsigned long protection_flags,
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static int handle_vmalloc_fault(struct mm_struct *mm,
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unsigned long protection_flags,
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unsigned long long textaccess,
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unsigned long address)
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{
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pgd_t *dir;
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pud_t *pud;
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pmd_t *pmd;
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static pte_t *pte;
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pte_t entry;
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dir = pgd_offset_k(address);
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pmd = pmd_offset(dir, address);
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if (pmd_none(*pmd)) {
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pud = pud_offset(dir, address);
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if (pud_none_or_clear_bad(pud))
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return 0;
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}
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if (pmd_bad(*pmd)) {
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pmd_clear(pmd);
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pmd = pmd_offset(pud, address);
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if (pmd_none_or_clear_bad(pmd))
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return 0;
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}
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pte = pte_offset_kernel(pmd, address);
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entry = *pte;
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if (pte_none(entry) || !pte_present(entry)) {
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if (pte_none(entry) || !pte_present(entry))
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return 0;
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}
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if ((pte_val(entry) & protection_flags) != protection_flags) {
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if ((pte_val(entry) & protection_flags) != protection_flags)
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return 0;
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}
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__do_tlb_refill(address, textaccess, pte);
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return 1;
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}
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static int handle_tlbmiss(struct mm_struct *mm, unsigned long long protection_flags,
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unsigned long long textaccess,
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unsigned long address)
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static int handle_tlbmiss(struct mm_struct *mm,
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unsigned long long protection_flags,
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unsigned long long textaccess,
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unsigned long address)
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{
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pgd_t *dir;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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pte_t entry;
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@ -144,49 +142,49 @@ static int handle_tlbmiss(struct mm_struct *mm, unsigned long long protection_fl
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See how mm->pgd is allocated and initialised in pgd_alloc to see why
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the next test is necessary. - RPC */
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if (address >= (unsigned long) TASK_SIZE) {
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if (address >= (unsigned long) TASK_SIZE)
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/* upper half - never has page table entries. */
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return 0;
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}
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dir = pgd_offset(mm, address);
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if (pgd_none(*dir)) {
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return 0;
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}
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if (!pgd_present(*dir)) {
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return 0;
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}
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pmd = pmd_offset(dir, address);
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if (pmd_none(*pmd)) {
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dir = pgd_offset(mm, address);
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if (pgd_none(*dir) || !pgd_present(*dir))
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return 0;
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}
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if (!pmd_present(*pmd)) {
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if (!pgd_present(*dir))
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return 0;
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}
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pud = pud_offset(dir, address);
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if (pud_none(*pud) || !pud_present(*pud))
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return 0;
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pmd = pmd_offset(pud, address);
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if (pmd_none(*pmd) || !pmd_present(*pmd))
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return 0;
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pte = pte_offset_kernel(pmd, address);
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entry = *pte;
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if (pte_none(entry)) {
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return 0;
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}
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if (!pte_present(entry)) {
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return 0;
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}
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/* If the page doesn't have sufficient protection bits set to service the
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kind of fault being handled, there's not much point doing the TLB refill.
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Punt the fault to the general handler. */
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if ((pte_val(entry) & protection_flags) != protection_flags) {
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if (pte_none(entry) || !pte_present(entry))
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return 0;
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/*
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* If the page doesn't have sufficient protection bits set to
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* service the kind of fault being handled, there's not much
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* point doing the TLB refill. Punt the fault to the general
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* handler.
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*/
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if ((pte_val(entry) & protection_flags) != protection_flags)
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return 0;
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}
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__do_tlb_refill(address, textaccess, pte);
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return 1;
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}
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/* Put all this information into one structure so that everything is just arithmetic
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relative to a single base address. This reduces the number of movi/shori pairs needed
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just to load addresses of static data. */
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/*
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* Put all this information into one structure so that everything is just
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* arithmetic relative to a single base address. This reduces the number
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* of movi/shori pairs needed just to load addresses of static data.
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*/
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struct expevt_lookup {
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unsigned short protection_flags[8];
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unsigned char is_text_access[8];
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@ -216,7 +214,8 @@ static struct expevt_lookup expevt_lookup_table = {
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general fault handling in fault.c which deals with mapping file-backed
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pages, stack growth, segmentation faults, swapping etc etc)
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*/
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asmlinkage int do_fast_page_fault(unsigned long long ssr_md, unsigned long long expevt,
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asmlinkage int do_fast_page_fault(unsigned long long ssr_md,
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unsigned long long expevt,
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unsigned long address)
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{
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struct task_struct *tsk;
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@ -226,17 +225,18 @@ asmlinkage int do_fast_page_fault(unsigned long long ssr_md, unsigned long long
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unsigned long long index;
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unsigned long long expevt4;
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/* The next few lines implement a way of hashing EXPEVT into a small array index
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which can be used to lookup parameters specific to the type of TLBMISS being
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handled. Note:
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ITLBMISS has EXPEVT==0xa40
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RTLBMISS has EXPEVT==0x040
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WTLBMISS has EXPEVT==0x060
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*/
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/* The next few lines implement a way of hashing EXPEVT into a
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* small array index which can be used to lookup parameters
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* specific to the type of TLBMISS being handled.
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*
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* Note:
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* ITLBMISS has EXPEVT==0xa40
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* RTLBMISS has EXPEVT==0x040
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* WTLBMISS has EXPEVT==0x060
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*/
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expevt4 = (expevt >> 4);
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/* TODO : xor ssr_md into this expression too. Then we can check that PRU is set
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when it needs to be. */
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/* TODO : xor ssr_md into this expression too. Then we can check
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* that PRU is set when it needs to be. */
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index = expevt4 ^ (expevt4 >> 5);
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index &= 7;
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protection_flags = expevt_lookup_table.protection_flags[index];
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@ -262,18 +262,18 @@ asmlinkage int do_fast_page_fault(unsigned long long ssr_md, unsigned long long
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if ((address >= VMALLOC_START && address < VMALLOC_END) ||
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(address >= IOBASE_VADDR && address < IOBASE_END)) {
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if (ssr_md) {
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/* Process-contexts can never have this address range mapped */
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if (handle_vmalloc_fault(mm, protection_flags, textaccess, address)) {
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if (ssr_md)
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/*
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* Process-contexts can never have this address
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* range mapped
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*/
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if (handle_vmalloc_fault(mm, protection_flags,
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textaccess, address))
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return 1;
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}
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}
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} else if (!in_interrupt() && mm) {
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if (handle_tlbmiss(mm, protection_flags, textaccess, address)) {
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if (handle_tlbmiss(mm, protection_flags, textaccess, address))
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return 1;
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}
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}
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return 0;
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}
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