diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sh/mm/Makefile_32 | 2 | ||||
| -rw-r--r-- | arch/sh/mm/Makefile_64 | 2 | ||||
| -rw-r--r-- | arch/sh/mm/fault_32.c (renamed from arch/sh/mm/fault.c) | 0 | ||||
| -rw-r--r-- | arch/sh/mm/fault_64.c (renamed from arch/sh64/mm/tlbmiss.c) | 146 |
4 files changed, 75 insertions, 75 deletions
diff --git a/arch/sh/mm/Makefile_32 b/arch/sh/mm/Makefile_32 index 9ea37930374..fc089c0cdbe 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.o clear_page.o copy_page.o tlb-flush_32.o \ +mmu-$(CONFIG_MMU) := fault_32.o clear_page.o copy_page.o tlb-flush_32.o \ ioremap_32.o obj-y += $(mmu-y) diff --git a/arch/sh/mm/Makefile_64 b/arch/sh/mm/Makefile_64 index ec8deaa1790..82fe9072fd5 100644 --- a/arch/sh/mm/Makefile_64 +++ b/arch/sh/mm/Makefile_64 @@ -5,7 +5,7 @@ obj-y := init.o extable_64.o consistent.o mmu-y := tlb-nommu.o pg-nommu.o -mmu-$(CONFIG_MMU) := ioremap_64.o tlb-flush_64.o +mmu-$(CONFIG_MMU) := fault_64.o ioremap_64.o tlb-flush_64.o obj-y += $(mmu-y) diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault_32.c index 60d74f793a1..60d74f793a1 100644 --- a/arch/sh/mm/fault.c +++ b/arch/sh/mm/fault_32.c diff --git a/arch/sh64/mm/tlbmiss.c b/arch/sh/mm/fault_64.c index b767d6cff72..1469aa70bc7 100644 --- a/arch/sh64/mm/tlbmiss.c +++ b/arch/sh/mm/fault_64.c @@ -1,9 +1,5 @@ /* - * 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/tlbmiss.c + * The SH64 TLB miss. * * Original code from fault.c * Copyright (C) 2000, 2001 Paolo Alberelli @@ -12,16 +8,20 @@ * Copyright (C) 2003 Richard.Curnow@superh.com * * IMPORTANT NOTES : - * The do_fast_page_fault function is called from a context in entry.S where very few registers - * have been saved. In particular, the code in this file must be compiled not to use ANY - * caller-save registers that are not part of the restricted save set. Also, it means that - * code in this file must not make calls to functions elsewhere in the kernel, or else the - * excepting context will see corruption in its caller-save registers. Plus, the entry.S save - * area is non-reentrant, so this code has to run with SR.BL==1, i.e. no interrupts taken inside - * it and panic on any exception. + * The do_fast_page_fault function is called from a context in entry.S + * where very few registers have been saved. In particular, the code in + * this file must be compiled not to use ANY caller-save registers that + * are not part of the restricted save set. Also, it means that code in + * this file must not make calls to functions elsewhere in the kernel, or + * else the excepting context will see corruption in its caller-save + * registers. Plus, the entry.S save area is non-reentrant, so this code + * has to run with SR.BL==1, i.e. no interrupts taken inside it and panic + * on any exception. * + * 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/sched.h> #include <linux/kernel.h> @@ -33,14 +33,13 @@ #include <linux/mm.h> #include <linux/smp.h> #include <linux/interrupt.h> - #include <asm/system.h> #include <asm/tlb.h> #include <asm/io.h> #include <asm/uaccess.h> #include <asm/pgalloc.h> #include <asm/mmu_context.h> -#include <asm/registers.h> /* required by inline asm statements */ +#include <asm/cpu/registers.h> /* Callable from fault.c, so not static */ inline void __do_tlb_refill(unsigned long address, @@ -88,48 +87,47 @@ inline void __do_tlb_refill(unsigned long address, } -static int handle_vmalloc_fault(struct mm_struct *mm, unsigned long protection_flags, +static int handle_vmalloc_fault(struct mm_struct *mm, + unsigned long protection_flags, unsigned long long textaccess, unsigned long address) { pgd_t *dir; + pud_t *pud; pmd_t *pmd; static pte_t *pte; pte_t entry; dir = pgd_offset_k(address); - pmd = pmd_offset(dir, address); - if (pmd_none(*pmd)) { + pud = pud_offset(dir, address); + if (pud_none_or_clear_bad(pud)) return 0; - } - if (pmd_bad(*pmd)) { - pmd_clear(pmd); + pmd = pmd_offset(pud, address); + if (pmd_none_or_clear_bad(pmd)) return 0; - } pte = pte_offset_kernel(pmd, address); entry = *pte; - if (pte_none(entry) || !pte_present(entry)) { + if (pte_none(entry) || !pte_present(entry)) return 0; - } - - if ((pte_val(entry) & protection_flags) != protection_flags) { + if ((pte_val(entry) & protection_flags) != protection_flags) return 0; - } __do_tlb_refill(address, textaccess, pte); return 1; } -static int handle_tlbmiss(struct mm_struct *mm, unsigned long long protection_flags, - unsigned long long textaccess, - unsigned long address) +static int handle_tlbmiss(struct mm_struct *mm, + unsigned long long protection_flags, + unsigned long long textaccess, + unsigned long address) { pgd_t *dir; + pud_t *pud; pmd_t *pmd; pte_t *pte; pte_t entry; @@ -144,49 +142,49 @@ static int handle_tlbmiss(struct mm_struct *mm, unsigned long long protection_fl See how mm->pgd is allocated and initialised in pgd_alloc to see why the next test is necessary. - RPC */ - if (address >= (unsigned long) TASK_SIZE) { + if (address >= (unsigned long) TASK_SIZE) /* upper half - never has page table entries. */ return 0; - } + dir = pgd_offset(mm, address); - if (pgd_none(*dir)) { + if (pgd_none(*dir) || !pgd_present(*dir)) return 0; - } - if (!pgd_present(*dir)) { + if (!pgd_present(*dir)) return 0; - } - pmd = pmd_offset(dir, address); - if (pmd_none(*pmd)) { + pud = pud_offset(dir, address); + if (pud_none(*pud) || !pud_present(*pud)) return 0; - } - if (!pmd_present(*pmd)) { + + pmd = pmd_offset(pud, address); + if (pmd_none(*pmd) || !pmd_present(*pmd)) return 0; - } + pte = pte_offset_kernel(pmd, address); entry = *pte; - if (pte_none(entry)) { - return 0; - } - if (!pte_present(entry)) { + + if (pte_none(entry) || !pte_present(entry)) return 0; - } - /* If the page doesn't have sufficient protection bits set to service the - kind of fault being handled, there's not much point doing the TLB refill. - Punt the fault to the general handler. */ - if ((pte_val(entry) & protection_flags) != protection_flags) { + /* + * If the page doesn't have sufficient protection bits set to + * service the kind of fault being handled, there's not much + * point doing the TLB refill. Punt the fault to the general + * handler. + */ + if ((pte_val(entry) & protection_flags) != protection_flags) return 0; - } __do_tlb_refill(address, textaccess, pte); return 1; } -/* Put all this information into one structure so that everything is just arithmetic - relative to a single base address. This reduces the number of movi/shori pairs needed - just to load addresses of static data. */ +/* + * Put all this information into one structure so that everything is just + * arithmetic relative to a single base address. This reduces the number + * of movi/shori pairs needed just to load addresses of static data. + */ struct expevt_lookup { unsigned short protection_flags[8]; unsigned char is_text_access[8]; @@ -216,7 +214,8 @@ static struct expevt_lookup expevt_lookup_table = { general fault handling in fault.c which deals with mapping file-backed pages, stack growth, segmentation faults, swapping etc etc) */ -asmlinkage int do_fast_page_fault(unsigned long long ssr_md, unsigned long long expevt, +asmlinkage int do_fast_page_fault(unsigned long long ssr_md, + unsigned long long expevt, unsigned long address) { struct task_struct *tsk; @@ -226,17 +225,18 @@ asmlinkage int do_fast_page_fault(unsigned long long ssr_md, unsigned long long unsigned long long index; unsigned long long expevt4; - /* The next few lines implement a way of hashing EXPEVT into a small array index - which can be used to lookup parameters specific to the type of TLBMISS being - handled. Note: - ITLBMISS has EXPEVT==0xa40 - RTLBMISS has EXPEVT==0x040 - WTLBMISS has EXPEVT==0x060 - */ - + /* The next few lines implement a way of hashing EXPEVT into a + * small array index which can be used to lookup parameters + * specific to the type of TLBMISS being handled. + * + * Note: + * ITLBMISS has EXPEVT==0xa40 + * RTLBMISS has EXPEVT==0x040 + * WTLBMISS has EXPEVT==0x060 + */ expevt4 = (expevt >> 4); - /* TODO : xor ssr_md into this expression too. Then we can check that PRU is set - when it needs to be. */ + /* TODO : xor ssr_md into this expression too. Then we can check + * that PRU is set when it needs to be. */ index = expevt4 ^ (expevt4 >> 5); index &= 7; protection_flags = expevt_lookup_table.protection_flags[index]; @@ -262,18 +262,18 @@ asmlinkage int do_fast_page_fault(unsigned long long ssr_md, unsigned long long if ((address >= VMALLOC_START && address < VMALLOC_END) || (address >= IOBASE_VADDR && address < IOBASE_END)) { - if (ssr_md) { - /* Process-contexts can never have this address range mapped */ - if (handle_vmalloc_fault(mm, protection_flags, textaccess, address)) { + if (ssr_md) + /* + * Process-contexts can never have this address + * range mapped + */ + if (handle_vmalloc_fault(mm, protection_flags, + textaccess, address)) return 1; - } - } } else if (!in_interrupt() && mm) { - if (handle_tlbmiss(mm, protection_flags, textaccess, address)) { + if (handle_tlbmiss(mm, protection_flags, textaccess, address)) return 1; - } } return 0; } - |