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 /*
  21  * User space process size. 47bits minus one guard page.
  22  */
  23 #define TASK_SIZE64     (0x800000000000UL - 4096)
  24
  25 /* This decides where the kernel will search for a free chunk of vm
  26  * space during mmap's.
  27  */
  28 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? 0xc0000000 : 0xFFFFe000)
  29
  30 #define TASK_SIZE               (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE64)
  31 #define TASK_SIZE_OF(child)     ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
  32
  33
  34 struct i387_fxsave_struct {
  35         u16     cwd;
  36         u16     swd;
  37         u16     twd;
  38         u16     fop;
  39         u64     rip;
  40         u64     rdp;
  41         u32     mxcsr;
  42         u32     mxcsr_mask;
  43         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
  44         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
  45         u32     padding[24];
  46 } __attribute__ ((aligned (16)));
  47
  48 union i387_union {
  49         struct i387_fxsave_struct       fxsave;
  50 };
  51
  52 DECLARE_PER_CPU(struct orig_ist, orig_ist);
  53
  54 #define INIT_THREAD  { \
  55         .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
  56 }
  57
  58 #define INIT_TSS  { \
  59         .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
  60 }
  61
  62 #define start_thread(regs,new_rip,new_rsp) do { \
  63         asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0));      \
  64         load_gs_index(0);                                                       \
  65         (regs)->ip = (new_rip);                                          \
  66         (regs)->sp = (new_rsp);                                          \
  67         write_pda(oldrsp, (new_rsp));                                            \
  68         (regs)->cs = __USER_CS;                                                  \
  69         (regs)->ss = __USER_DS;                                                  \
  70         (regs)->flags = 0x200;                                                   \
  71         set_fs(USER_DS);                                                         \
  72 } while(0)
  73
  74 /*
  75  * Return saved PC of a blocked thread.
  76  * What is this good for? it will be always the scheduler or ret_from_fork.
  77  */
  78 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8))
  79
  80 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1)
  81 #define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
  82
  83 #endif /* __ASM_X86_64_PROCESSOR_H */