From: Glauber de Oliveira Costa Date: Wed, 30 Jan 2008 12:31:13 +0000 (+0100) Subject: x86: change write_gdt_entry signature. X-Git-Tag: v2.6.25-rc1~1143^2~601 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=014b15be30c04622d130946ab7c0a9101b523a8a;p=linux-2.6 x86: change write_gdt_entry signature. This patch changes the write_gdt_entry function signature. Instead of the old "a" and "b" parameters, it now receives a pointer to a desc_struct, and the size of the entry being handled. This is because x86_64 can have some 16-byte entries as well as 8-byte ones. Signed-off-by: Glauber de Oliveira Costa CC: Zachary Amsden CC: Jeremy Fitzhardinge Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- diff --git a/arch/x86/kernel/paravirt_32.c b/arch/x86/kernel/paravirt_32.c index 13bbc99b63..77602c1252 100644 --- a/arch/x86/kernel/paravirt_32.c +++ b/arch/x86/kernel/paravirt_32.c @@ -380,7 +380,7 @@ struct pv_cpu_ops pv_cpu_ops = { .store_tr = native_store_tr, .load_tls = native_load_tls, .write_ldt_entry = write_dt_entry, - .write_gdt_entry = write_dt_entry, + .write_gdt_entry = native_write_gdt_entry, .write_idt_entry = native_write_idt_entry, .load_sp0 = native_load_sp0, diff --git a/arch/x86/kernel/smpcommon_32.c b/arch/x86/kernel/smpcommon_32.c index bbfe85a0f6..8bc38af29a 100644 --- a/arch/x86/kernel/smpcommon_32.c +++ b/arch/x86/kernel/smpcommon_32.c @@ -14,10 +14,11 @@ __cpuinit void init_gdt(int cpu) { struct desc_struct *gdt = get_cpu_gdt_table(cpu); - pack_descriptor((u32 *)&gdt[GDT_ENTRY_PERCPU].a, - (u32 *)&gdt[GDT_ENTRY_PERCPU].b, + pack_descriptor(&gdt[GDT_ENTRY_PERCPU], __per_cpu_offset[cpu], 0xFFFFF, - 0x80 | DESCTYPE_S | 0x2, 0x8); + 0x2 | DESCTYPE_S, 0x8); + + gdt[GDT_ENTRY_PERCPU].s = 1; per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu]; per_cpu(cpu_number, cpu) = cpu; diff --git a/arch/x86/kernel/vmi_32.c b/arch/x86/kernel/vmi_32.c index a635b22de2..21edd0d6ea 100644 --- a/arch/x86/kernel/vmi_32.c +++ b/arch/x86/kernel/vmi_32.c @@ -63,6 +63,7 @@ static struct { void (*_set_ldt)(u32 selector); void (*set_tr)(u32 selector); void (*write_idt_entry)(struct desc_struct *, int, u32, u32); + void (*write_gdt_entry)(struct desc_struct *, int, u32, u32); void (*set_kernel_stack)(u32 selector, u32 sp0); void (*allocate_page)(u32, u32, u32, u32, u32); void (*release_page)(u32, u32); @@ -187,7 +188,7 @@ static void vmi_cpuid(unsigned int *ax, unsigned int *bx, static inline void vmi_maybe_load_tls(struct desc_struct *gdt, int nr, struct desc_struct *new) { if (gdt[nr].a != new->a || gdt[nr].b != new->b) - write_gdt_entry(gdt, nr, new->a, new->b); + write_gdt_entry(gdt, nr, new, 0); } static void vmi_load_tls(struct thread_struct *t, unsigned int cpu) @@ -201,12 +202,12 @@ static void vmi_load_tls(struct thread_struct *t, unsigned int cpu) static void vmi_set_ldt(const void *addr, unsigned entries) { unsigned cpu = smp_processor_id(); - u32 low, high; + struct desc_struct desc; - pack_descriptor(&low, &high, (unsigned long)addr, + pack_descriptor(&desc, (unsigned long)addr, entries * sizeof(struct desc_struct) - 1, - DESCTYPE_LDT, 0); - write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, low, high); + DESC_LDT, 0); + write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, &desc, DESC_LDT); vmi_ops._set_ldt(entries ? GDT_ENTRY_LDT*sizeof(struct desc_struct) : 0); } @@ -221,6 +222,13 @@ static void vmi_write_idt_entry(gate_desc *dt, int entry, const gate_desc *g) vmi_ops.write_idt_entry(dt, entry, idt_entry[0], idt_entry[2]); } +static void vmi_write_gdt_entry(struct desc_struct *dt, int entry, + const void *desc, int type) +{ + u32 *gdt_entry = (u32 *)desc; + vmi_ops.write_gdt_entry(dt, entry, gdt_entry[0], gdt_entry[2]); +} + static void vmi_load_sp0(struct tss_struct *tss, struct thread_struct *thread) { @@ -798,7 +806,8 @@ static inline int __init activate_vmi(void) para_fill(pv_cpu_ops.store_tr, GetTR); pv_cpu_ops.load_tls = vmi_load_tls; para_fill(pv_cpu_ops.write_ldt_entry, WriteLDTEntry); - para_fill(pv_cpu_ops.write_gdt_entry, WriteGDTEntry); + para_wrap(pv_cpu_ops.write_gdt_entry, vmi_write_gdt_entry, + write_gdt_entry, WriteGDTEntry); para_wrap(pv_cpu_ops.write_idt_entry, vmi_write_idt_entry, write_idt_entry, WriteIDTEntry); para_wrap(pv_cpu_ops.load_sp0, vmi_load_sp0, set_kernel_stack, UpdateKernelStack); diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c index b50c8ad25a..a63373759f 100644 --- a/arch/x86/lguest/boot.c +++ b/arch/x86/lguest/boot.c @@ -262,10 +262,10 @@ static void lguest_load_gdt(const struct desc_ptr *desc) /* For a single GDT entry which changes, we do the lazy thing: alter our GDT, * then tell the Host to reload the entire thing. This operation is so rare * that this naive implementation is reasonable. */ -static void lguest_write_gdt_entry(struct desc_struct *dt, - int entrynum, u32 low, u32 high) +static void lguest_write_gdt_entry(struct desc_struct *dt, int entrynum, + const void *desc, int type) { - write_dt_entry(dt, entrynum, low, high); + native_write_gdt_entry(dt, entrynum, desc, type); hcall(LHCALL_LOAD_GDT, __pa(dt), GDT_ENTRIES, 0); } diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index b7b7346d8c..7f98c63f63 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -475,22 +475,21 @@ static void xen_load_idt(const struct desc_ptr *desc) /* Write a GDT descriptor entry. Ignore LDT descriptors, since they're handled differently. */ static void xen_write_gdt_entry(struct desc_struct *dt, int entry, - u32 low, u32 high) + const void *desc, int type) { preempt_disable(); - switch ((high >> 8) & 0xff) { - case DESCTYPE_LDT: - case DESCTYPE_TSS: + switch (type) { + case DESC_LDT: + case DESC_TSS: /* ignore */ break; default: { xmaddr_t maddr = virt_to_machine(&dt[entry]); - u64 desc = (u64)high << 32 | low; xen_mc_flush(); - if (HYPERVISOR_update_descriptor(maddr.maddr, desc)) + if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc)) BUG(); } diff --git a/include/asm-x86/desc_32.h b/include/asm-x86/desc_32.h index 03700991c5..41d8214c61 100644 --- a/include/asm-x86/desc_32.h +++ b/include/asm-x86/desc_32.h @@ -28,12 +28,13 @@ 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(__u32 *a, __u32 *b, +static inline void pack_descriptor(struct desc_struct *desc, unsigned long base, unsigned long limit, unsigned char type, unsigned char flags) { - *a = ((base & 0xffff) << 16) | (limit & 0xffff); - *b = (base & 0xff000000) | ((base & 0xff0000) >> 16) | + desc->a = ((base & 0xffff) << 16) | (limit & 0xffff); + desc->b = (base & 0xff000000) | ((base & 0xff0000) >> 16) | (limit & 0x000f0000) | ((type & 0xff) << 8) | ((flags & 0xf) << 20); + desc->p = 1; } static inline void pack_gate(gate_desc *gate, @@ -69,7 +70,8 @@ static inline void pack_gate(gate_desc *gate, #define set_ldt native_set_ldt #define write_ldt_entry(dt, entry, a, b) write_dt_entry(dt, entry, a, b) -#define write_gdt_entry(dt, entry, a, b) write_dt_entry(dt, entry, a, b) +#define write_gdt_entry(dt, entry, desc, type) \ + native_write_gdt_entry(dt, entry, desc, type) #define write_idt_entry(dt, entry, g) native_write_idt_entry(dt, entry, g) #endif @@ -79,6 +81,12 @@ static inline void native_write_idt_entry(gate_desc *idt, int entry, memcpy(&idt[entry], gate, sizeof(*gate)); } +static inline void native_write_gdt_entry(struct desc_struct *gdt, int entry, + const void *desc, int type) +{ + memcpy(&gdt[entry], desc, sizeof(struct desc_struct)); +} + static inline void write_dt_entry(struct desc_struct *dt, int entry, u32 entry_low, u32 entry_high) { @@ -86,18 +94,20 @@ static inline void write_dt_entry(struct desc_struct *dt, dt[entry].b = entry_high; } + static inline void native_set_ldt(const void *addr, unsigned int entries) { if (likely(entries == 0)) __asm__ __volatile__("lldt %w0"::"q" (0)); else { unsigned cpu = smp_processor_id(); - __u32 a, b; + ldt_desc ldt; - pack_descriptor(&a, &b, (unsigned long)addr, + pack_descriptor(&ldt, (unsigned long)addr, entries * sizeof(struct desc_struct) - 1, - DESCTYPE_LDT, 0); - write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, a, b); + DESC_LDT, 0); + write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, + &ldt, DESC_LDT); __asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8)); } } @@ -153,11 +163,11 @@ static inline void _set_gate(int gate, unsigned int type, void *addr, unsigned s static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, const void *addr) { - __u32 a, b; - pack_descriptor(&a, &b, (unsigned long)addr, + tss_desc tss; + pack_descriptor(&tss, (unsigned long)addr, offsetof(struct tss_struct, __cacheline_filler) - 1, - DESCTYPE_TSS, 0); - write_gdt_entry(get_cpu_gdt_table(cpu), entry, a, b); + DESC_TSS, 0); + write_gdt_entry(get_cpu_gdt_table(cpu), entry, &tss, DESC_TSS); } diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h index 86a9d7b092..3f2abf295e 100644 --- a/include/asm-x86/paravirt.h +++ b/include/asm-x86/paravirt.h @@ -99,7 +99,7 @@ struct pv_cpu_ops { void (*write_ldt_entry)(struct desc_struct *, int entrynum, u32 low, u32 high); void (*write_gdt_entry)(struct desc_struct *, - int entrynum, u32 low, u32 high); + int entrynum, const void *desc, int size); void (*write_idt_entry)(gate_desc *, int entrynum, const gate_desc *gate); void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t); @@ -664,10 +664,13 @@ static inline void write_ldt_entry(void *dt, int entry, u32 low, u32 high) { PVOP_VCALL4(pv_cpu_ops.write_ldt_entry, dt, entry, low, high); } -static inline void write_gdt_entry(void *dt, int entry, u32 low, u32 high) + +static inline void write_gdt_entry(struct desc_struct *dt, int entry, + void *desc, int type) { - PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, low, high); + PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type); } + static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g) { PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);