From f51c94528a9bc73504928926ca4d791a2b7ddd7c Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Sun, 22 Jul 2007 11:12:29 +0200 Subject: [PATCH] x86_64: Use read and write crX in .c files This patch uses the read and write functions provided at system.h for control registers instead of writting raw assembly over and over again in .c files. Functions to manipulate cr2 and cr8 were provided, as they were lacking. Also, removed some extra space after closing brackets Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- arch/x86_64/kernel/process.c | 8 ++++---- arch/x86_64/kernel/suspend.c | 20 ++++++++++---------- arch/x86_64/mm/fault.c | 4 ++-- arch/x86_64/mm/init.c | 2 +- include/asm-x86_64/system.h | 34 +++++++++++++++++++++++++++++----- 5 files changed, 46 insertions(+), 22 deletions(-) diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c index 92fade4a62c..e7ac629d4c4 100644 --- a/arch/x86_64/kernel/process.c +++ b/arch/x86_64/kernel/process.c @@ -342,10 +342,10 @@ void __show_regs(struct pt_regs * regs) rdmsrl(MSR_GS_BASE, gs); rdmsrl(MSR_KERNEL_GS_BASE, shadowgs); - asm("movq %%cr0, %0": "=r" (cr0)); - asm("movq %%cr2, %0": "=r" (cr2)); - asm("movq %%cr3, %0": "=r" (cr3)); - asm("movq %%cr4, %0": "=r" (cr4)); + cr0 = read_cr0(); + cr2 = read_cr2(); + cr3 = read_cr3(); + cr4 = read_cr4(); printk("FS: %016lx(%04x) GS:%016lx(%04x) knlGS:%016lx\n", fs,fsindex,gs,gsindex,shadowgs); diff --git a/arch/x86_64/kernel/suspend.c b/arch/x86_64/kernel/suspend.c index 6a5a98f2a75..ea83a9f9196 100644 --- a/arch/x86_64/kernel/suspend.c +++ b/arch/x86_64/kernel/suspend.c @@ -55,11 +55,11 @@ void __save_processor_state(struct saved_context *ctxt) * control registers */ rdmsrl(MSR_EFER, ctxt->efer); - asm volatile ("movq %%cr0, %0" : "=r" (ctxt->cr0)); - asm volatile ("movq %%cr2, %0" : "=r" (ctxt->cr2)); - asm volatile ("movq %%cr3, %0" : "=r" (ctxt->cr3)); - asm volatile ("movq %%cr4, %0" : "=r" (ctxt->cr4)); - asm volatile ("movq %%cr8, %0" : "=r" (ctxt->cr8)); + ctxt->cr0 = read_cr0(); + ctxt->cr2 = read_cr2(); + ctxt->cr3 = read_cr3(); + ctxt->cr4 = read_cr4(); + ctxt->cr8 = read_cr8(); } void save_processor_state(void) @@ -81,11 +81,11 @@ void __restore_processor_state(struct saved_context *ctxt) * control registers */ wrmsrl(MSR_EFER, ctxt->efer); - asm volatile ("movq %0, %%cr8" :: "r" (ctxt->cr8)); - asm volatile ("movq %0, %%cr4" :: "r" (ctxt->cr4)); - asm volatile ("movq %0, %%cr3" :: "r" (ctxt->cr3)); - asm volatile ("movq %0, %%cr2" :: "r" (ctxt->cr2)); - asm volatile ("movq %0, %%cr0" :: "r" (ctxt->cr0)); + write_cr8(ctxt->cr8); + write_cr4(ctxt->cr4); + write_cr3(ctxt->cr3); + write_cr2(ctxt->cr2); + write_cr0(ctxt->cr0); /* * now restore the descriptor tables to their proper values diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c index 5e9ac70c135..327c9f2fa62 100644 --- a/arch/x86_64/mm/fault.c +++ b/arch/x86_64/mm/fault.c @@ -159,7 +159,7 @@ void dump_pagetable(unsigned long address) pmd_t *pmd; pte_t *pte; - asm("movq %%cr3,%0" : "=r" (pgd)); + pgd = (pgd_t *)read_cr3(); pgd = __va((unsigned long)pgd & PHYSICAL_PAGE_MASK); pgd += pgd_index(address); @@ -316,7 +316,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, prefetchw(&mm->mmap_sem); /* get the address */ - __asm__("movq %%cr2,%0":"=r" (address)); + address = read_cr2(); info.si_code = SEGV_MAPERR; diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c index 88678e82e23..2044fa961c0 100644 --- a/arch/x86_64/mm/init.c +++ b/arch/x86_64/mm/init.c @@ -383,7 +383,7 @@ void __meminit init_memory_mapping(unsigned long start, unsigned long end) } if (!after_bootmem) - asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features)); + mmu_cr4_features = read_cr4(); __flush_tlb_all(); } diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h index 6313d33a068..02175aa1d16 100644 --- a/include/asm-x86_64/system.h +++ b/include/asm-x86_64/system.h @@ -75,19 +75,31 @@ static inline unsigned long read_cr0(void) unsigned long cr0; asm volatile("movq %%cr0,%0" : "=r" (cr0)); return cr0; -} +} static inline void write_cr0(unsigned long val) { asm volatile("movq %0,%%cr0" :: "r" (val)); -} +} + +static inline unsigned long read_cr2(void) +{ + unsigned long cr2; + asm("movq %%cr2,%0" : "=r" (cr2)); + return cr2; +} + +static inline void write_cr2(unsigned long val) +{ + asm volatile("movq %0,%%cr2" :: "r" (val)); +} static inline unsigned long read_cr3(void) { unsigned long cr3; asm("movq %%cr3,%0" : "=r" (cr3)); return cr3; -} +} static inline void write_cr3(unsigned long val) { @@ -99,12 +111,24 @@ static inline unsigned long read_cr4(void) unsigned long cr4; asm("movq %%cr4,%0" : "=r" (cr4)); return cr4; -} +} static inline void write_cr4(unsigned long val) { asm volatile("movq %0,%%cr4" :: "r" (val) : "memory"); -} +} + +static inline unsigned long read_cr8(void) +{ + unsigned long cr8; + asm("movq %%cr8,%0" : "=r" (cr8)); + return cr8; +} + +static inline void write_cr8(unsigned long val) +{ + asm volatile("movq %0,%%cr8" :: "r" (val) : "memory"); +} #define stts() write_cr0(8 | read_cr0()) -- 2.41.1