include/asm-x86/processor_64.h

   1 /*
   2  * Copyright (C) 1994 Linus Torvalds
   3  */
   4
   5 #ifndef __ASM_X86_64_PROCESSOR_H
   6 #define __ASM_X86_64_PROCESSOR_H
   7
   8 #include <asm/segment.h>
   9 #include <asm/page.h>
  10 #include <asm/types.h>
  11 #include <asm/sigcontext.h>
  12 #include <asm/cpufeature.h>
  13 #include <linux/threads.h>
  14 #include <asm/msr.h>
  15 #include <asm/current.h>
  16 #include <asm/system.h>
  17 #include <linux/personality.h>
  18 #include <asm/desc_defs.h>
  19
  20 extern void identify_cpu(struct cpuinfo_x86 *);
  21
  22 /*
  23  * User space process size. 47bits minus one guard page.
  24  */
  25 #define TASK_SIZE64     (0x800000000000UL - 4096)
  26
  27 /* This decides where the kernel will search for a free chunk of vm
  28  * space during mmap's.
  29  */
  30 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? 0xc0000000 : 0xFFFFe000)
  31
  32 #define TASK_SIZE               (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE64)
  33 #define TASK_SIZE_OF(child)     ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
  34
  35
  36 struct i387_fxsave_struct {
  37         u16     cwd;
  38         u16     swd;
  39         u16     twd;
  40         u16     fop;
  41         u64     rip;
  42         u64     rdp;
  43         u32     mxcsr;
  44         u32     mxcsr_mask;
  45         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
  46         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
  47         u32     padding[24];
  48 } __attribute__ ((aligned (16)));
  49
  50 union i387_union {
  51         struct i387_fxsave_struct       fxsave;
  52 };
  53
  54 /* Save the original ist values for checking stack pointers during debugging */
  55 struct orig_ist {
  56         unsigned long ist[7];
  57 };
  58 DECLARE_PER_CPU(struct orig_ist, orig_ist);
  59
  60 #define INIT_THREAD  { \
  61         .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
  62 }
  63
  64 #define INIT_TSS  { \
  65         .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
  66 }
  67
  68 #define start_thread(regs,new_rip,new_rsp) do { \
  69         asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0));      \
  70         load_gs_index(0);                                                       \
  71         (regs)->ip = (new_rip);                                          \
  72         (regs)->sp = (new_rsp);                                          \
  73         write_pda(oldrsp, (new_rsp));                                            \
  74         (regs)->cs = __USER_CS;                                                  \
  75         (regs)->ss = __USER_DS;                                                  \
  76         (regs)->flags = 0x200;                                                   \
  77         set_fs(USER_DS);                                                         \
  78 } while(0)
  79
  80 /*
  81  * Return saved PC of a blocked thread.
  82  * What is this good for? it will be always the scheduler or ret_from_fork.
  83  */
  84 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8))
  85
  86 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1)
  87 #define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
  88
  89
  90 #if defined(CONFIG_MPSC) || defined(CONFIG_MCORE2)
  91 #define ASM_NOP1 P6_NOP1
  92 #define ASM_NOP2 P6_NOP2
  93 #define ASM_NOP3 P6_NOP3
  94 #define ASM_NOP4 P6_NOP4
  95 #define ASM_NOP5 P6_NOP5
  96 #define ASM_NOP6 P6_NOP6
  97 #define ASM_NOP7 P6_NOP7
  98 #define ASM_NOP8 P6_NOP8
  99 #else
 100 #define ASM_NOP1 K8_NOP1
 101 #define ASM_NOP2 K8_NOP2
 102 #define ASM_NOP3 K8_NOP3
 103 #define ASM_NOP4 K8_NOP4
 104 #define ASM_NOP5 K8_NOP5
 105 #define ASM_NOP6 K8_NOP6
 106 #define ASM_NOP7 K8_NOP7
 107 #define ASM_NOP8 K8_NOP8
 108 #endif
 109
 110 /* Opteron nops */
 111 #define K8_NOP1 ".byte 0x90\n"
 112 #define K8_NOP2 ".byte 0x66,0x90\n"
 113 #define K8_NOP3 ".byte 0x66,0x66,0x90\n"
 114 #define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n"
 115 #define K8_NOP5 K8_NOP3 K8_NOP2
 116 #define K8_NOP6 K8_NOP3 K8_NOP3
 117 #define K8_NOP7 K8_NOP4 K8_NOP3
 118 #define K8_NOP8 K8_NOP4 K8_NOP4
 119
 120 /* P6 nops */
 121 /* uses eax dependencies (Intel-recommended choice) */
 122 #define P6_NOP1 ".byte 0x90\n"
 123 #define P6_NOP2 ".byte 0x66,0x90\n"
 124 #define P6_NOP3 ".byte 0x0f,0x1f,0x00\n"
 125 #define P6_NOP4 ".byte 0x0f,0x1f,0x40,0\n"
 126 #define P6_NOP5 ".byte 0x0f,0x1f,0x44,0x00,0\n"
 127 #define P6_NOP6 ".byte 0x66,0x0f,0x1f,0x44,0x00,0\n"
 128 #define P6_NOP7 ".byte 0x0f,0x1f,0x80,0,0,0,0\n"
 129 #define P6_NOP8 ".byte 0x0f,0x1f,0x84,0x00,0,0,0,0\n"
 130
 131 #define ASM_NOP_MAX 8
 132
 133 static inline void prefetchw(void *x)
 134 {
 135         alternative_input("prefetcht0 (%1)",
 136                           "prefetchw (%1)",
 137                           X86_FEATURE_3DNOW,
 138                           "r" (x));
 139 }
 140
 141 #endif /* __ASM_X86_64_PROCESSOR_H */