#ifndef _ASM_X86_PROCESSOR_H #define _ASM_X86_PROCESSOR_H #include /* Forward declaration, a strange C thing */ struct task_struct; struct mm_struct; #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Default implementation of macro that returns current * instruction pointer ("program counter"). */ static inline void *current_text_addr(void) { void *pc; asm volatile("mov $1f, %0; 1:":"=r" (pc)); return pc; } #ifdef CONFIG_X86_VSMP # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT) # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT) #else # define ARCH_MIN_TASKALIGN 16 # define ARCH_MIN_MMSTRUCT_ALIGN 0 #endif /* * CPU type and hardware bug flags. Kept separately for each CPU. * Members of this structure are referenced in head.S, so think twice * before touching them. [mj] */ struct cpuinfo_x86 { __u8 x86; /* CPU family */ __u8 x86_vendor; /* CPU vendor */ __u8 x86_model; __u8 x86_mask; #ifdef CONFIG_X86_32 char wp_works_ok; /* It doesn't on 386's */ /* Problems on some 486Dx4's and old 386's: */ char hlt_works_ok; char hard_math; char rfu; char fdiv_bug; char f00f_bug; char coma_bug; char pad0; #else /* Number of 4K pages in DTLB/ITLB combined(in pages): */ int x86_tlbsize; __u8 x86_virt_bits; __u8 x86_phys_bits; #endif /* CPUID returned core id bits: */ __u8 x86_coreid_bits; /* Max extended CPUID function supported: */ __u32 extended_cpuid_level; /* Maximum supported CPUID level, -1=no CPUID: */ int cpuid_level; __u32 x86_capability[NCAPINTS]; char x86_vendor_id[16]; char x86_model_id[64]; /* in KB - valid for CPUS which support this call: */ int x86_cache_size; int x86_cache_alignment; /* In bytes */ int x86_power; unsigned long loops_per_jiffy; #ifdef CONFIG_SMP /* cpus sharing the last level cache: */ cpumask_t llc_shared_map; #endif /* cpuid returned max cores value: */ u16 x86_max_cores; u16 apicid; u16 initial_apicid; u16 x86_clflush_size; #ifdef CONFIG_SMP /* number of cores as seen by the OS: */ u16 booted_cores; /* Physical processor id: */ u16 phys_proc_id; /* Core id: */ u16 cpu_core_id; /* Index into per_cpu list: */ u16 cpu_index; #endif unsigned int x86_hyper_vendor; } __attribute__((__aligned__(SMP_CACHE_BYTES))); #define X86_VENDOR_INTEL 0 #define X86_VENDOR_CYRIX 1 #define X86_VENDOR_AMD 2 #define X86_VENDOR_UMC 3 #define X86_VENDOR_CENTAUR 5 #define X86_VENDOR_TRANSMETA 7 #define X86_VENDOR_NSC 8 #define X86_VENDOR_NUM 9 #define X86_VENDOR_UNKNOWN 0xff #define X86_HYPER_VENDOR_NONE 0 #define X86_HYPER_VENDOR_VMWARE 1 /* * capabilities of CPUs */ extern struct cpuinfo_x86 boot_cpu_data; extern struct cpuinfo_x86 new_cpu_data; extern struct tss_struct doublefault_tss; extern __u32 cleared_cpu_caps[NCAPINTS]; #ifdef CONFIG_SMP DECLARE_PER_CPU(struct cpuinfo_x86, cpu_info); #define cpu_data(cpu) per_cpu(cpu_info, cpu) #define current_cpu_data __get_cpu_var(cpu_info) #else #define cpu_data(cpu) boot_cpu_data #define current_cpu_data boot_cpu_data #endif extern const struct seq_operations cpuinfo_op; static inline int hlt_works(int cpu) { #ifdef CONFIG_X86_32 return cpu_data(cpu).hlt_works_ok; #else return 1; #endif } #define cache_line_size() (boot_cpu_data.x86_cache_alignment) extern void cpu_detect(struct cpuinfo_x86 *c); extern struct pt_regs *idle_regs(struct pt_regs *); extern void early_cpu_init(void); extern void identify_boot_cpu(void); extern void identify_secondary_cpu(struct cpuinfo_x86 *); extern void print_cpu_info(struct cpuinfo_x86 *); extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c); extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c); extern unsigned short num_cache_leaves; extern void detect_extended_topology(struct cpuinfo_x86 *c); extern void detect_ht(struct cpuinfo_x86 *c); static inline void native_cpuid(unsigned int *eax, unsigned int *ebx, unsigned int *ecx, unsigned int *edx) { /* ecx is often an input as well as an output. */ asm("cpuid" : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx) : "0" (*eax), "2" (*ecx)); } static inline void load_cr3(pgd_t *pgdir) { write_cr3(__pa(pgdir)); } #ifdef CONFIG_X86_32 /* This is the TSS defined by the hardware. */ struct x86_hw_tss { unsigned short back_link, __blh; unsigned long sp0; unsigned short ss0, __ss0h; unsigned long sp1; /* ss1 caches MSR_IA32_SYSENTER_CS: */ unsigned short ss1, __ss1h; unsigned long sp2; unsigned short ss2, __ss2h; unsigned long __cr3; unsigned long ip; unsigned long flags; unsigned long ax; unsigned long cx; unsigned long dx; unsigned long bx; unsigned long sp; unsigned long bp; unsigned long si; unsigned long di; unsigned short es, __esh; unsigned short cs, __csh; unsigned short ss, __ssh; unsigned short ds, __dsh; unsigned short fs, __fsh; unsigned short gs, __gsh; unsigned short ldt, __ldth; unsigned short trace; unsigned short io_bitmap_base; } __attribute__((packed)); #else struct x86_hw_tss { u32 reserved1; u64 sp0; u64 sp1; u64 sp2; u64 reserved2; u64 ist[7]; u32 reserved3; u32 reserved4; u16 reserved5; u16 io_bitmap_base; } __attribute__((packed)) ____cacheline_aligned; #endif /* * IO-bitmap sizes: */ #define IO_BITMAP_BITS 65536 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) #define IO_BITMAP_OFFSET offsetof(struct tss_struct, io_bitmap) #define INVALID_IO_BITMAP_OFFSET 0x8000 #define INVALID_IO_BITMAP_OFFSET_LAZY 0x9000 struct tss_struct { /* * The hardware state: */ struct x86_hw_tss x86_tss; /* * The extra 1 is there because the CPU will access an * additional byte beyond the end of the IO permission * bitmap. The extra byte must be all 1 bits, and must * be within the limit. */ unsigned long io_bitmap[IO_BITMAP_LONGS + 1]; /* * Cache the current maximum and the last task that used the bitmap: */ unsigned long io_bitmap_max; struct thread_struct *io_bitmap_owner; /* * .. and then another 0x100 bytes for the emergency kernel stack: */ unsigned long stack[64]; } ____cacheline_aligned; DECLARE_PER_CPU(struct tss_struct, init_tss); /* * Save the original ist values for checking stack pointers during debugging */ struct orig_ist { unsigned long ist[7]; }; #define MXCSR_DEFAULT 0x1f80 struct i387_fsave_struct { u32 cwd; /* FPU Control Word */ u32 swd; /* FPU Status Word */ u32 twd; /* FPU Tag Word */ u32 fip; /* FPU IP Offset */ u32 fcs; /* FPU IP Selector */ u32 foo; /* FPU Operand Pointer Offset */ u32 fos; /* FPU Operand Pointer Selector */ /* 8*10 bytes for each FP-reg = 80 bytes: */ u32 st_space[20]; /* Software status information [not touched by FSAVE ]: */ u32 status; }; struct i387_fxsave_struct { u16 cwd; /* Control Word */ u16 swd; /* Status Word */ u16 twd; /* Tag Word */ u16 fop; /* Last Instruction Opcode */ union { struct { u64 rip; /* Instruction Pointer */ u64 rdp; /* Data Pointer */ }; struct { u32 fip; /* FPU IP Offset */ u32 fcs; /* FPU IP Selector */ u32 foo; /* FPU Operand Offset */ u32 fos; /* FPU Operand Selector */ }; }; u32 mxcsr; /* MXCSR Register State */ u32 mxcsr_mask; /* MXCSR Mask */ /* 8*16 bytes for each FP-reg = 128 bytes: */ u32 st_space[32]; /* 16*16 bytes for each XMM-reg = 256 bytes: */ u32 xmm_space[64]; u32 padding[12]; union { u32 padding1[12]; u32 sw_reserved[12]; }; } __attribute__((aligned(16))); struct i387_soft_struct { u32 cwd; u32 swd; u32 twd; u32 fip; u32 fcs; u32 foo; u32 fos; /* 8*10 bytes for each FP-reg = 80 bytes: */ u32 st_space[20]; u8 ftop; u8 changed; u8 lookahead; u8 no_update; u8 rm; u8 alimit; struct math_emu_info *info; u32 entry_eip; }; struct xsave_hdr_struct { u64 xstate_bv; u64 reserved1[2]; u64 reserved2[5]; } __attribute__((packed)); struct xsave_struct { struct i387_fxsave_struct i387; struct xsave_hdr_struct xsave_hdr; /* new processor state extensions will go here */ } __attribute__ ((packed, aligned (64))); union thread_xstate { struct i387_fsave_struct fsave; struct i387_fxsave_struct fxsave; struct i387_soft_struct soft; struct xsave_struct xsave; }; #ifdef CONFIG_X86_64 DECLARE_PER_CPU(struct orig_ist, orig_ist); union irq_stack_union { char irq_stack[IRQ_STACK_SIZE]; /* * GCC hardcodes the stack canary as %gs:40. Since the * irq_stack is the object at %gs:0, we reserve the bottom * 48 bytes of the irq stack for the canary. */ struct { char gs_base[40]; unsigned long stack_canary; }; }; DECLARE_PER_CPU(union irq_stack_union, irq_stack_union); DECLARE_INIT_PER_CPU(irq_stack_union); DECLARE_PER_CPU(char *, irq_stack_ptr); #endif extern void print_cpu_info(struct cpuinfo_x86 *); extern unsigned int xstate_size; extern void free_thread_xstate(struct task_struct *); extern struct kmem_cache *task_xstate_cachep; extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c); extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c); extern unsigned short num_cache_leaves; struct thread_struct { /* Cached TLS descriptors: */ struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES]; unsigned long sp0; unsigned long sp; #ifdef CONFIG_X86_32 unsigned long sysenter_cs; #else unsigned long usersp; /* Copy from PDA */ unsigned short es; unsigned short ds; unsigned short fsindex; unsigned short gsindex; #endif unsigned long ip; unsigned long fs; unsigned long gs; /* Hardware debugging registers: */ unsigned long debugreg0; unsigned long debugreg1; unsigned long debugreg2; unsigned long debugreg3; unsigned long debugreg6; unsigned long debugreg7; /* Fault info: */ unsigned long cr2; unsigned long trap_no; unsigned long error_code; /* floating point and extended processor state */ union thread_xstate *xstate; #ifdef CONFIG_X86_32 /* Virtual 86 mode info */ struct vm86_struct __user *vm86_info; unsigned long screen_bitmap; unsigned long v86flags; unsigned long v86mask; unsigned long saved_sp0; unsigned int saved_fs; unsigned int saved_gs; #endif /* IO permissions: */ unsigned long *io_bitmap_ptr; unsigned long iopl; /* Max allowed port in the bitmap, in bytes: */ unsigned io_bitmap_max; /* MSR_IA32_DEBUGCTLMSR value to switch in if TIF_DEBUGCTLMSR is set. */ unsigned long debugctlmsr; #ifdef CONFIG_X86_DS /* Debug Store context; see include/asm-x86/ds.h; goes into MSR_IA32_DS_AREA */ struct ds_context *ds_ctx; #endif /* CONFIG_X86_DS */ #ifdef CONFIG_X86_PTRACE_BTS /* the signal to send on a bts buffer overflow */ unsigned int bts_ovfl_signal; #endif /* CONFIG_X86_PTRACE_BTS */ }; static inline unsigned long native_get_debugreg(int regno) { unsigned long val = 0; /* Damn you, gcc! */ switch (regno) { case 0: asm("mov %%db0, %0" :"=r" (val)); break; case 1: asm("mov %%db1, %0" :"=r" (val)); break; case 2: asm("mov %%db2, %0" :"=r" (val)); break; case 3: asm("mov %%db3, %0" :"=r" (val)); break; case 6: asm("mov %%db6, %0" :"=r" (val)); break; case 7: asm("mov %%db7, %0" :"=r" (val)); break; default: BUG(); } return val; } static inline void native_set_debugreg(int regno, unsigned long value) { switch (regno) { case 0: asm("mov %0, %%db0" ::"r" (value)); break; case 1: asm("mov %0, %%db1" ::"r" (value)); break; case 2: asm("mov %0, %%db2" ::"r" (value)); break; case 3: asm("mov %0, %%db3" ::"r" (value)); break; case 6: asm("mov %0, %%db6" ::"r" (value)); break; case 7: asm("mov %0, %%db7" ::"r" (value)); break; default: BUG(); } } /* * Set IOPL bits in EFLAGS from given mask */ static inline void native_set_iopl_mask(unsigned mask) { #ifdef CONFIG_X86_32 unsigned int reg; asm volatile ("pushfl;" "popl %0;" "andl %1, %0;" "orl %2, %0;" "pushl %0;" "popfl" : "=&r" (reg) : "i" (~X86_EFLAGS_IOPL), "r" (mask)); #endif } static inline void native_load_sp0(struct tss_struct *tss, struct thread_struct *thread) { tss->x86_tss.sp0 = thread->sp0; #ifdef CONFIG_X86_32 /* Only happens when SEP is enabled, no need to test "SEP"arately: */ if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) { tss->x86_tss.ss1 = thread->sysenter_cs; wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0); } #endif } static inline void native_swapgs(void) { #ifdef CONFIG_X86_64 asm volatile("swapgs" ::: "memory"); #endif } #ifdef CONFIG_PARAVIRT #include #else #define __cpuid native_cpuid #define paravirt_enabled() 0 /* * These special macros can be used to get or set a debugging register */ #define get_debugreg(var, register) \ (var) = native_get_debugreg(register) #define set_debugreg(value, register) \ native_set_debugreg(register, value) static inline void load_sp0(struct tss_struct *tss, struct thread_struct *thread) { native_load_sp0(tss, thread); } #define set_iopl_mask native_set_iopl_mask #endif /* CONFIG_PARAVIRT */ /* * Save the cr4 feature set we're using (ie * Pentium 4MB enable and PPro Global page * enable), so that any CPU's that boot up * after us can get the correct flags. */ extern unsigned long mmu_cr4_features; static inline void set_in_cr4(unsigned long mask) { unsigned cr4; mmu_cr4_features |= mask; cr4 = read_cr4(); cr4 |= mask; write_cr4(cr4); } static inline void clear_in_cr4(unsigned long mask) { unsigned cr4; mmu_cr4_features &= ~mask; cr4 = read_cr4(); cr4 &= ~mask; write_cr4(cr4); } typedef struct { unsigned long seg; } mm_segment_t; /* * create a kernel thread without removing it from tasklists */ extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); /* Free all resources held by a thread. */ extern void release_thread(struct task_struct *); /* Prepare to copy thread state - unlazy all lazy state */ extern void prepare_to_copy(struct task_struct *tsk); unsigned long get_wchan(struct task_struct *p); /* * Generic CPUID function * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx * resulting in stale register contents being returned. */ static inline void cpuid(unsigned int op, unsigned int *eax, unsigned int *ebx, unsigned int *ecx, unsigned int *edx) { *eax = op; *ecx = 0; __cpuid(eax, ebx, ecx, edx); } /* Some CPUID calls want 'count' to be placed in ecx */ static inline void cpuid_count(unsigned int op, int count, unsigned int *eax, unsigned int *ebx, unsigned int *ecx, unsigned int *edx) { *eax = op; *ecx = count; __cpuid(eax, ebx, ecx, edx); } /* * CPUID functions returning a single datum */ static inline unsigned int cpuid_eax(unsigned int op) { unsigned int eax, ebx, ecx, edx; cpuid(op, &eax, &ebx, &ecx, &edx); return eax; } static inline unsigned int cpuid_ebx(unsigned int op) { unsigned int eax, ebx, ecx, edx; cpuid(op, &eax, &ebx, &ecx, &edx); return ebx; } static inline unsigned int cpuid_ecx(unsigned int op) { unsigned int eax, ebx, ecx, edx; cpuid(op, &eax, &ebx, &ecx, &edx); return ecx; } static inline unsigned int cpuid_edx(unsigned int op) { unsigned int eax, ebx, ecx, edx; cpuid(op, &eax, &ebx, &ecx, &edx); return edx; } /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */ static inline void rep_nop(void) { asm volatile("rep; nop" ::: "memory"); } static inline void cpu_relax(void) { rep_nop(); } /* Stop speculative execution: */ static inline void sync_core(void) { int tmp; asm volatile("cpuid" : "=a" (tmp) : "0" (1) : "ebx", "ecx", "edx", "memory"); } static inline void __monitor(const void *eax, unsigned long ecx, unsigned long edx) { /* "monitor %eax, %ecx, %edx;" */ asm volatile(".byte 0x0f, 0x01, 0xc8;" :: "a" (eax), "c" (ecx), "d"(edx)); } static inline void __mwait(unsigned long eax, unsigned long ecx) { /* "mwait %eax, %ecx;" */ asm volatile(".byte 0x0f, 0x01, 0xc9;" :: "a" (eax), "c" (ecx)); } static inline void __sti_mwait(unsigned long eax, unsigned long ecx) { trace_hardirqs_on(); /* "mwait %eax, %ecx;" */ asm volatile("sti; .byte 0x0f, 0x01, 0xc9;" :: "a" (eax), "c" (ecx)); } extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx); extern void select_idle_routine(const struct cpuinfo_x86 *c); extern unsigned long boot_option_idle_override; extern unsigned long idle_halt; extern unsigned long idle_nomwait; /* * on systems with caches, caches must be flashed as the absolute * last instruction before going into a suspended halt. Otherwise, * dirty data can linger in the cache and become stale on resume, * leading to strange errors. * * perform a variety of operations to guarantee that the compiler * will not reorder instructions. wbinvd itself is serializing * so the processor will not reorder. * * Systems without cache can just go into halt. */ static inline void wbinvd_halt(void) { mb(); /* check for clflush to determine if wbinvd is legal */ if (cpu_has_clflush) asm volatile("cli; wbinvd; 1: hlt; jmp 1b" : : : "memory"); else while (1) halt(); } extern void enable_sep_cpu(void); extern int sysenter_setup(void); /* Defined in head.S */ extern struct desc_ptr early_gdt_descr; extern void cpu_set_gdt(int); extern void switch_to_new_gdt(int); extern void load_percpu_segment(int); extern void cpu_init(void); static inline unsigned long get_debugctlmsr(void) { unsigned long debugctlmsr = 0; #ifndef CONFIG_X86_DEBUGCTLMSR if (boot_cpu_data.x86 < 6) return 0; #endif rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr); return debugctlmsr; } static inline void update_debugctlmsr(unsigned long debugctlmsr) { #ifndef CONFIG_X86_DEBUGCTLMSR if (boot_cpu_data.x86 < 6) return; #endif wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr); } /* * from system description table in BIOS. Mostly for MCA use, but * others may find it useful: */ extern unsigned int machine_id; extern unsigned int machine_submodel_id; extern unsigned int BIOS_revision; /* Boot loader type from the setup header: */ extern int bootloader_type; extern char ignore_fpu_irq; #define HAVE_ARCH_PICK_MMAP_LAYOUT 1 #define ARCH_HAS_PREFETCHW #define ARCH_HAS_SPINLOCK_PREFETCH #ifdef CONFIG_X86_32 # define BASE_PREFETCH ASM_NOP4 # define ARCH_HAS_PREFETCH #else # define BASE_PREFETCH "prefetcht0 (%1)" #endif /* * Prefetch instructions for Pentium III (+) and AMD Athlon (+) * * It's not worth to care about 3dnow prefetches for the K6 * because they are microcoded there and very slow. */ static inline void prefetch(const void *x) { alternative_input(BASE_PREFETCH, "prefetchnta (%1)", X86_FEATURE_XMM, "r" (x)); } /* * 3dnow prefetch to get an exclusive cache line. * Useful for spinlocks to avoid one state transition in the * cache coherency protocol: */ static inline void prefetchw(const void *x) { alternative_input(BASE_PREFETCH, "prefetchw (%1)", X86_FEATURE_3DNOW, "r" (x)); } static inline void spin_lock_prefetch(const void *x) { prefetchw(x); } #ifdef CONFIG_X86_32 /* * User space process size: 3GB (default). */ #define TASK_SIZE PAGE_OFFSET #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX STACK_TOP #define INIT_THREAD { \ .sp0 = sizeof(init_stack) + (long)&init_stack, \ .vm86_info = NULL, \ .sysenter_cs = __KERNEL_CS, \ .io_bitmap_ptr = NULL, \ .fs = __KERNEL_PERCPU, \ } /* * Note that the .io_bitmap member must be extra-big. This is because * the CPU will access an additional byte beyond the end of the IO * permission bitmap. The extra byte must be all 1 bits, and must * be within the limit. */ #define INIT_TSS { \ .x86_tss = { \ .sp0 = sizeof(init_stack) + (long)&init_stack, \ .ss0 = __KERNEL_DS, \ .ss1 = __KERNEL_CS, \ .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \ }, \ .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, \ } extern unsigned long thread_saved_pc(struct task_struct *tsk); #define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long)) #define KSTK_TOP(info) \ ({ \ unsigned long *__ptr = (unsigned long *)(info); \ (unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \ }) /* * The below -8 is to reserve 8 bytes on top of the ring0 stack. * This is necessary to guarantee that the entire "struct pt_regs" * is accessable even if the CPU haven't stored the SS/ESP registers * on the stack (interrupt gate does not save these registers * when switching to the same priv ring). * Therefore beware: accessing the ss/esp fields of the * "struct pt_regs" is possible, but they may contain the * completely wrong values. */ #define task_pt_regs(task) \ ({ \ struct pt_regs *__regs__; \ __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \ __regs__ - 1; \ }) #define KSTK_ESP(task) (task_pt_regs(task)->sp) #else /* * User space process size. 47bits minus one guard page. */ #define TASK_SIZE64 ((1UL << 47) - PAGE_SIZE) /* This decides where the kernel will search for a free chunk of vm * space during mmap's. */ #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \ 0xc0000000 : 0xFFFFe000) #define TASK_SIZE (test_thread_flag(TIF_IA32) ? \ IA32_PAGE_OFFSET : TASK_SIZE64) #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? \ IA32_PAGE_OFFSET : TASK_SIZE64) #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX TASK_SIZE64 #define INIT_THREAD { \ .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \ } #define INIT_TSS { \ .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \ } /* * Return saved PC of a blocked thread. * What is this good for? it will be always the scheduler or ret_from_fork. */ #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8)) #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1) #define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */ #endif /* CONFIG_X86_64 */ extern void start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp); /* * This decides where the kernel will search for a free chunk of vm * space during mmap's. */ #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) #define KSTK_EIP(task) (task_pt_regs(task)->ip) /* Get/set a process' ability to use the timestamp counter instruction */ #define GET_TSC_CTL(adr) get_tsc_mode((adr)) #define SET_TSC_CTL(val) set_tsc_mode((val)) extern int get_tsc_mode(unsigned long adr); extern int set_tsc_mode(unsigned int val); #endif /* _ASM_X86_PROCESSOR_H */