Add an accessor function for getting the per-CPU gdt. Callee must already have the CPU. Patch-base: 2.6.13-rc5-mm1 Patch-keys: i386 desc xen Signed-off-by: Zachary Amsden <zach@xxxxxxxxxx> Index: linux-2.6.13/include/asm-i386/desc.h =================================================================== --- linux-2.6.13.orig/include/asm-i386/desc.h 2005-08-09 20:17:21.000000000 -0700 +++ linux-2.6.13/include/asm-i386/desc.h 2005-08-10 20:41:03.000000000 -0700 @@ -39,6 +39,8 @@ extern struct desc_struct cpu_gdt_table[GDT_ENTRIES]; DECLARE_PER_CPU(struct desc_struct, cpu_gdt_table[GDT_ENTRIES]); +#define get_cpu_gdt_table(_cpu) (per_cpu(cpu_gdt_table, _cpu)) + DECLARE_PER_CPU(unsigned char, cpu_16bit_stack[CPU_16BIT_STACK_SIZE]); struct Xgt_desc_struct { Index: linux-2.6.13/include/asm-i386/mach-default/mach_desc.h =================================================================== --- linux-2.6.13.orig/include/asm-i386/mach-default/mach_desc.h 2005-08-09 20:17:21.000000000 -0700 +++ linux-2.6.13/include/asm-i386/mach-default/mach_desc.h 2005-08-10 16:37:36.000000000 -0700 @@ -53,13 +53,13 @@ static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, void *addr) { - _set_tssldt_desc(&per_cpu(cpu_gdt_table, cpu)[entry], (int)addr, + _set_tssldt_desc(&get_cpu_gdt_table(cpu)[entry], (int)addr, offsetof(struct tss_struct, __cacheline_filler) - 1, 0x89); } static inline void set_ldt_desc(unsigned int cpu, void *addr, unsigned int size) { - _set_tssldt_desc(&per_cpu(cpu_gdt_table, cpu)[GDT_ENTRY_LDT], (int)addr, ((size << 3)-1), 0x82); + _set_tssldt_desc(&get_cpu_gdt_table(cpu)[GDT_ENTRY_LDT], (int)addr, ((size << 3)-1), 0x82); } static inline int write_ldt_entry(void *ldt, int entry, __u32 entry_a, __u32 entry_b) @@ -72,7 +72,7 @@ static inline void load_TLS(struct thread_struct *t, unsigned int cpu) { - memcpy(&per_cpu(cpu_gdt_table, cpu)[GDT_ENTRY_TLS_MIN], t->tls_array, TLS_SIZE); + memcpy(&get_cpu_gdt_table(cpu)[GDT_ENTRY_TLS_MIN], t->tls_array, TLS_SIZE); } #endif Index: linux-2.6.13/arch/i386/kernel/apm.c =================================================================== --- linux-2.6.13.orig/arch/i386/kernel/apm.c 2005-08-09 20:17:21.000000000 -0700 +++ linux-2.6.13/arch/i386/kernel/apm.c 2005-08-10 20:41:52.000000000 -0700 @@ -597,12 +597,14 @@ cpumask_t cpus; int cpu; struct desc_struct save_desc_40; + struct desc_struct *gdt; cpus = apm_save_cpus(); cpu = get_cpu(); - save_desc_40 = per_cpu(cpu_gdt_table, cpu)[0x40 / 8]; - per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = bad_bios_desc; + gdt = get_cpu_gdt_table(cpu); + save_desc_40 = gdt[segment_index(0x40)]; + gdt[segment_index(0x40)] = bad_bios_desc; local_save_flags(flags); APM_DO_CLI; @@ -610,7 +612,7 @@ apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi); APM_DO_RESTORE_SEGS; local_irq_restore(flags); - per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = save_desc_40; + gdt[segment_index(0x40)] = save_desc_40; put_cpu(); apm_restore_cpus(cpus); @@ -639,13 +641,14 @@ cpumask_t cpus; int cpu; struct desc_struct save_desc_40; - + struct desc_struct *gdt; cpus = apm_save_cpus(); cpu = get_cpu(); - save_desc_40 = per_cpu(cpu_gdt_table, cpu)[0x40 / 8]; - per_cpu(cpu_gdt_table, cpu)[0x40 / 8] = bad_bios_desc; + gdt = get_cpu_gdt_table(cpu); + save_desc_40 = gdt[segment_index(0x40)]; + gdt[segment_index(0x40)] = bad_bios_desc; local_save_flags(flags); APM_DO_CLI; @@ -653,7 +656,7 @@ error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax); APM_DO_RESTORE_SEGS; local_irq_restore(flags); - __get_cpu_var(cpu_gdt_table)[0x40 / 8] = save_desc_40; + gdt[segment_index(0x40)] = save_desc_40; put_cpu(); apm_restore_cpus(cpus); return error; @@ -2295,35 +2298,36 @@ apm_bios_entry.segment = APM_CS; for (i = 0; i < NR_CPUS; i++) { - set_base(per_cpu(cpu_gdt_table, i)[APM_CS >> 3], + struct desc_struct *gdt = get_cpu_gdt_table(i); + set_base(gdt[segment_index(APM_CS)], __va((unsigned long)apm_info.bios.cseg << 4)); - set_base(per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3], + set_base(gdt[segment_index(APM_CS_16)], __va((unsigned long)apm_info.bios.cseg_16 << 4)); - set_base(per_cpu(cpu_gdt_table, i)[APM_DS >> 3], + set_base(gdt[segment_index(APM_DS)], __va((unsigned long)apm_info.bios.dseg << 4)); #ifndef APM_RELAX_SEGMENTS if (apm_info.bios.version == 0x100) { #endif /* For ASUS motherboard, Award BIOS rev 110 (and others?) */ - _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 - 1); + _set_limit((char *)&gdt[segment_index(APM_CS)], 64 * 1024 - 1); /* For some unknown machine. */ - _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3], 64 * 1024 - 1); + _set_limit((char *)&gdt[segment_index(APM_CS_16)], 64 * 1024 - 1); /* For the DEC Hinote Ultra CT475 (and others?) */ - _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3], 64 * 1024 - 1); + _set_limit((char *)&gdt[segment_index(APM_DS)], 64 * 1024 - 1); #ifndef APM_RELAX_SEGMENTS } else { - _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], + _set_limit((char *)&gdt[segment_index(APM_CS)], (apm_info.bios.cseg_len - 1) & 0xffff); - _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS_16 >> 3], + _set_limit((char *)&gdt[segment_index(APM_CS_16)], (apm_info.bios.cseg_16_len - 1) & 0xffff); - _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_DS >> 3], + _set_limit((char *)&gdt[segment_index(APM_DS)], (apm_info.bios.dseg_len - 1) & 0xffff); /* workaround for broken BIOSes */ if (apm_info.bios.cseg_len <= apm_info.bios.offset) - _set_limit((char *)&per_cpu(cpu_gdt_table, i)[APM_CS >> 3], 64 * 1024 -1); + _set_limit((char *)&gdt[segment_index(APM_CS)], 64 * 1024 -1); if (apm_info.bios.dseg_len <= 0x40) { /* 0x40 * 4kB == 64kB */ /* for the BIOS that assumes granularity = 1 */ - per_cpu(cpu_gdt_table, i)[APM_DS >> 3].b |= 0x800000; + gdt[segment_index(APM_DS)].b |= 0x800000; printk(KERN_NOTICE "apm: we set the granularity of dseg.\n"); } } Index: linux-2.6.13/arch/i386/kernel/kprobes.c =================================================================== Index: linux-2.6.13/arch/i386/kernel/cpu/common.c =================================================================== --- linux-2.6.13.orig/arch/i386/kernel/cpu/common.c 2005-08-09 20:17:21.000000000 -0700 +++ linux-2.6.13/arch/i386/kernel/cpu/common.c 2005-08-09 20:17:26.000000000 -0700 @@ -573,6 +573,7 @@ int cpu = smp_processor_id(); struct tss_struct * t = &per_cpu(init_tss, cpu); struct thread_struct *thread = ¤t->thread; + struct desc_struct *gdt = get_cpu_gdt_table(cpu); __u32 stk16_off = (__u32)&per_cpu(cpu_16bit_stack, cpu); if (cpu_test_and_set(cpu, cpu_initialized)) { @@ -594,18 +595,16 @@ * Initialize the per-CPU GDT with the boot GDT, * and set up the GDT descriptor: */ - memcpy(&per_cpu(cpu_gdt_table, cpu), cpu_gdt_table, - GDT_SIZE); + memcpy(gdt, cpu_gdt_table, GDT_SIZE); /* Set up GDT entry for 16bit stack */ - *(__u64 *)&(per_cpu(cpu_gdt_table, cpu)[GDT_ENTRY_ESPFIX_SS]) |= + *(__u64 *)(&gdt[GDT_ENTRY_ESPFIX_SS]) |= ((((__u64)stk16_off) << 16) & 0x000000ffffff0000ULL) | ((((__u64)stk16_off) << 32) & 0xff00000000000000ULL) | (CPU_16BIT_STACK_SIZE - 1); cpu_gdt_descr[cpu].size = GDT_SIZE - 1; - cpu_gdt_descr[cpu].address = - (unsigned long)&per_cpu(cpu_gdt_table, cpu); + cpu_gdt_descr[cpu].address = (unsigned long)gdt; load_gdt(&cpu_gdt_descr[cpu]); load_idt(&idt_descr); Index: linux-2.6.13/arch/i386/mm/fault.c =================================================================== --- linux-2.6.13.orig/arch/i386/mm/fault.c 2005-08-09 20:17:21.000000000 -0700 +++ linux-2.6.13/arch/i386/mm/fault.c 2005-08-09 20:17:26.000000000 -0700 @@ -109,7 +109,7 @@ desc = (void *)desc + (seg & ~7); } else { /* Must disable preemption while reading the GDT. */ - desc = per_cpu(cpu_gdt_table, get_cpu()); + desc = get_cpu_gdt_table(get_cpu()); desc = (void *)desc + (seg & ~7); } Index: linux-2.6.13/arch/i386/math-emu/fpu_system.h ===================================================================