From 881c2975d02b6575c417a6eee40868d60a9ecba9 Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Wed, 30 Jan 2008 13:31:14 +0100 Subject: [PATCH] x86: unify non-paravirt parts of desc.h This patch unifies the non-paravirt part of desc_{32,64}.h into desc.h. Most of it, is simply common code, that is moved to the shared header. The only exception is the set_ldt_desc in desc_64.h, which is changed - included its name - to accomodate for the way the ldt is set up in i386. Also, constant definitions used in desc_32.h are moved to desc_defs.h Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- include/asm-x86/desc.h | 65 +++++++++++++++++++++++++++++++- include/asm-x86/desc_32.h | 58 ---------------------------- include/asm-x86/desc_64.h | 55 +++++---------------------- include/asm-x86/mmu_context_64.h | 4 +- 4 files changed, 76 insertions(+), 106 deletions(-) diff --git a/include/asm-x86/desc.h b/include/asm-x86/desc.h index 47086d2d92..99c4adc851 100644 --- a/include/asm-x86/desc.h +++ b/include/asm-x86/desc.h @@ -4,6 +4,7 @@ #ifndef __ASSEMBLY__ #include #include +#include static inline void fill_ldt(struct desc_struct *desc, struct user_desc *info) { @@ -23,7 +24,8 @@ static inline void fill_ldt(struct desc_struct *desc, struct user_desc *info) desc->base2 = (info->base_addr & 0xff000000) >> 24; } -#endif +extern struct desc_ptr idt_descr; +extern gate_desc idt_table[]; #ifdef CONFIG_X86_32 # include "desc_32.h" @@ -31,4 +33,65 @@ static inline void fill_ldt(struct desc_struct *desc, struct user_desc *info) # include "desc_64.h" #endif +#define _LDT_empty(info) (\ + (info)->base_addr == 0 && \ + (info)->limit == 0 && \ + (info)->contents == 0 && \ + (info)->read_exec_only == 1 && \ + (info)->seg_32bit == 0 && \ + (info)->limit_in_pages == 0 && \ + (info)->seg_not_present == 1 && \ + (info)->useable == 0) + +#ifdef CONFIG_X86_64 +#define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0)) +#else +#define LDT_empty(info) (_LDT_empty(info)) +#endif + +static inline void clear_LDT(void) +{ + set_ldt(NULL, 0); +} + +/* + * load one particular LDT into the current CPU + */ +static inline void load_LDT_nolock(mm_context_t *pc) +{ + set_ldt(pc->ldt, pc->size); +} + +static inline void load_LDT(mm_context_t *pc) +{ + preempt_disable(); + load_LDT_nolock(pc); + preempt_enable(); +} + +#else +/* + * GET_DESC_BASE reads the descriptor base of the specified segment. + * + * Args: + * idx - descriptor index + * gdt - GDT pointer + * base - 32bit register to which the base will be written + * lo_w - lo word of the "base" register + * lo_b - lo byte of the "base" register + * hi_b - hi byte of the low word of the "base" register + * + * Example: + * GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah) + * Will read the base address of GDT_ENTRY_ESPFIX_SS and put it into %eax. + */ +#define GET_DESC_BASE(idx, gdt, base, lo_w, lo_b, hi_b) \ + movb idx*8+4(gdt), lo_b; \ + movb idx*8+7(gdt), hi_b; \ + shll $16, base; \ + movw idx*8+2(gdt), lo_w; + + +#endif /* __ASSEMBLY__ */ + #endif diff --git a/include/asm-x86/desc_32.h b/include/asm-x86/desc_32.h index 14238df87c..01415ad35f 100644 --- a/include/asm-x86/desc_32.h +++ b/include/asm-x86/desc_32.h @@ -11,8 +11,6 @@ #include #include -#include - struct gdt_page { struct desc_struct gdt[GDT_ENTRIES]; @@ -24,8 +22,6 @@ static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu) return per_cpu(gdt_page, cpu).gdt; } -extern struct desc_ptr idt_descr; -extern gate_desc idt_table[]; extern void set_intr_gate(unsigned int irq, void * addr); static inline void pack_descriptor(struct desc_struct *desc, @@ -172,36 +168,6 @@ static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, const vo #define set_tss_desc(cpu,addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr) -#define LDT_empty(info) (\ - (info)->base_addr == 0 && \ - (info)->limit == 0 && \ - (info)->contents == 0 && \ - (info)->read_exec_only == 1 && \ - (info)->seg_32bit == 0 && \ - (info)->limit_in_pages == 0 && \ - (info)->seg_not_present == 1 && \ - (info)->useable == 0 ) - -static inline void clear_LDT(void) -{ - set_ldt(NULL, 0); -} - -/* - * load one particular LDT into the current CPU - */ -static inline void load_LDT_nolock(mm_context_t *pc) -{ - set_ldt(pc->ldt, pc->size); -} - -static inline void load_LDT(mm_context_t *pc) -{ - preempt_disable(); - load_LDT_nolock(pc); - preempt_enable(); -} - static inline unsigned long get_desc_base(unsigned long *desc) { unsigned long base; @@ -210,30 +176,6 @@ static inline unsigned long get_desc_base(unsigned long *desc) (desc[1] & 0xff000000); return base; } - -#else /* __ASSEMBLY__ */ - -/* - * GET_DESC_BASE reads the descriptor base of the specified segment. - * - * Args: - * idx - descriptor index - * gdt - GDT pointer - * base - 32bit register to which the base will be written - * lo_w - lo word of the "base" register - * lo_b - lo byte of the "base" register - * hi_b - hi byte of the low word of the "base" register - * - * Example: - * GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah) - * Will read the base address of GDT_ENTRY_ESPFIX_SS and put it into %eax. - */ -#define GET_DESC_BASE(idx, gdt, base, lo_w, lo_b, hi_b) \ - movb idx*8+4(gdt), lo_b; \ - movb idx*8+7(gdt), hi_b; \ - shll $16, base; \ - movw idx*8+2(gdt), lo_w; - #endif /* !__ASSEMBLY__ */ #endif diff --git a/include/asm-x86/desc_64.h b/include/asm-x86/desc_64.h index 7cdd3f0420..c037c7d55b 100644 --- a/include/asm-x86/desc_64.h +++ b/include/asm-x86/desc_64.h @@ -9,16 +9,13 @@ #include #include -#include #include -#include extern struct desc_struct cpu_gdt_table[GDT_ENTRIES]; #define load_TR_desc() asm volatile("ltr %w0"::"r" (GDT_ENTRY_TSS*8)) #define load_LDT_desc() asm volatile("lldt %w0"::"r" (GDT_ENTRY_LDT*8)) -#define clear_LDT() asm volatile("lldt %w0"::"r" (0)) static inline unsigned long __store_tr(void) { @@ -30,7 +27,6 @@ static inline unsigned long __store_tr(void) #define store_tr(tr) (tr) = __store_tr() -extern gate_desc idt_table[]; extern struct desc_ptr cpu_gdt_descr[]; static inline void write_ldt_entry(struct desc_struct *ldt, @@ -138,22 +134,18 @@ static inline void set_tss_desc(unsigned cpu, void *addr) IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1); } -static inline void set_ldt_desc(unsigned cpu, void *addr, int size) +static inline void set_ldt(void *addr, int entries) { - set_tssldt_descriptor(&get_cpu_gdt_table(cpu)[GDT_ENTRY_LDT], - (unsigned long)addr, DESC_LDT, size * 8 - 1); -} + if (likely(entries == 0)) + __asm__ __volatile__("lldt %w0"::"q" (0)); + else { + unsigned cpu = smp_processor_id(); -#define LDT_empty(info) (\ - (info)->base_addr == 0 && \ - (info)->limit == 0 && \ - (info)->contents == 0 && \ - (info)->read_exec_only == 1 && \ - (info)->seg_32bit == 0 && \ - (info)->limit_in_pages == 0 && \ - (info)->seg_not_present == 1 && \ - (info)->useable == 0 && \ - (info)->lm == 0) + set_tssldt_descriptor(&get_cpu_gdt_table(cpu)[GDT_ENTRY_LDT], + (unsigned long)addr, DESC_LDT, entries * 8 - 1); + __asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8)); + } +} static inline void load_TLS(struct thread_struct *t, unsigned int cpu) { @@ -164,32 +156,6 @@ static inline void load_TLS(struct thread_struct *t, unsigned int cpu) gdt[i] = t->tls_array[i]; } -/* - * load one particular LDT into the current CPU - */ -static inline void load_LDT_nolock(mm_context_t *pc, int cpu) -{ - int count = pc->size; - - if (likely(!count)) { - clear_LDT(); - return; - } - - set_ldt_desc(cpu, pc->ldt, count); - load_LDT_desc(); -} - -static inline void load_LDT(mm_context_t *pc) -{ - int cpu = get_cpu(); - - load_LDT_nolock(pc, cpu); - put_cpu(); -} - -extern struct desc_ptr idt_descr; - static inline unsigned long get_desc_base(const void *ptr) { const u32 *desc = ptr; @@ -199,7 +165,6 @@ static inline unsigned long get_desc_base(const void *ptr) (desc[1] & 0xff000000); return base; } - #endif /* !__ASSEMBLY__ */ #endif diff --git a/include/asm-x86/mmu_context_64.h b/include/asm-x86/mmu_context_64.h index 29f95c3acc..98bfe43dd8 100644 --- a/include/asm-x86/mmu_context_64.h +++ b/include/asm-x86/mmu_context_64.h @@ -43,7 +43,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, load_cr3(next->pgd); if (unlikely(next->context.ldt != prev->context.ldt)) - load_LDT_nolock(&next->context, cpu); + load_LDT_nolock(&next->context); } #ifdef CONFIG_SMP else { @@ -56,7 +56,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, * to make sure to use no freed page tables. */ load_cr3(next->pgd); - load_LDT_nolock(&next->context, cpu); + load_LDT_nolock(&next->context); } } #endif -- 2.39.5