2 * Copyright (C) 1994 Linus Torvalds
5 #ifndef __ASM_X86_64_PROCESSOR_H
6 #define __ASM_X86_64_PROCESSOR_H
8 #include <asm/segment.h>
10 #include <asm/types.h>
11 #include <asm/sigcontext.h>
12 #include <asm/cpufeature.h>
13 #include <linux/threads.h>
15 #include <asm/current.h>
16 #include <asm/system.h>
17 #include <asm/mmsegment.h>
18 #include <linux/personality.h>
19 #include <asm/desc_defs.h>
21 extern char ignore_irq13;
23 extern void identify_cpu(struct cpuinfo_x86 *);
26 * User space process size. 47bits minus one guard page.
28 #define TASK_SIZE64 (0x800000000000UL - 4096)
30 /* This decides where the kernel will search for a free chunk of vm
31 * space during mmap's.
33 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? 0xc0000000 : 0xFFFFe000)
35 #define TASK_SIZE (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE64)
36 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
39 struct i387_fxsave_struct {
48 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
49 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
51 } __attribute__ ((aligned (16)));
54 struct i387_fxsave_struct fxsave;
57 /* Save the original ist values for checking stack pointers during debugging */
61 DECLARE_PER_CPU(struct orig_ist, orig_ist);
63 #define INIT_THREAD { \
64 .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
68 .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
72 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
74 #define start_thread(regs,new_rip,new_rsp) do { \
75 asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0)); \
77 (regs)->ip = (new_rip); \
78 (regs)->sp = (new_rsp); \
79 write_pda(oldrsp, (new_rsp)); \
80 (regs)->cs = __USER_CS; \
81 (regs)->ss = __USER_DS; \
82 (regs)->flags = 0x200; \
87 * Return saved PC of a blocked thread.
88 * What is this good for? it will be always the scheduler or ret_from_fork.
90 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8))
92 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1)
93 #define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
96 #if defined(CONFIG_MPSC) || defined(CONFIG_MCORE2)
97 #define ASM_NOP1 P6_NOP1
98 #define ASM_NOP2 P6_NOP2
99 #define ASM_NOP3 P6_NOP3
100 #define ASM_NOP4 P6_NOP4
101 #define ASM_NOP5 P6_NOP5
102 #define ASM_NOP6 P6_NOP6
103 #define ASM_NOP7 P6_NOP7
104 #define ASM_NOP8 P6_NOP8
106 #define ASM_NOP1 K8_NOP1
107 #define ASM_NOP2 K8_NOP2
108 #define ASM_NOP3 K8_NOP3
109 #define ASM_NOP4 K8_NOP4
110 #define ASM_NOP5 K8_NOP5
111 #define ASM_NOP6 K8_NOP6
112 #define ASM_NOP7 K8_NOP7
113 #define ASM_NOP8 K8_NOP8
117 #define K8_NOP1 ".byte 0x90\n"
118 #define K8_NOP2 ".byte 0x66,0x90\n"
119 #define K8_NOP3 ".byte 0x66,0x66,0x90\n"
120 #define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n"
121 #define K8_NOP5 K8_NOP3 K8_NOP2
122 #define K8_NOP6 K8_NOP3 K8_NOP3
123 #define K8_NOP7 K8_NOP4 K8_NOP3
124 #define K8_NOP8 K8_NOP4 K8_NOP4
127 /* uses eax dependencies (Intel-recommended choice) */
128 #define P6_NOP1 ".byte 0x90\n"
129 #define P6_NOP2 ".byte 0x66,0x90\n"
130 #define P6_NOP3 ".byte 0x0f,0x1f,0x00\n"
131 #define P6_NOP4 ".byte 0x0f,0x1f,0x40,0\n"
132 #define P6_NOP5 ".byte 0x0f,0x1f,0x44,0x00,0\n"
133 #define P6_NOP6 ".byte 0x66,0x0f,0x1f,0x44,0x00,0\n"
134 #define P6_NOP7 ".byte 0x0f,0x1f,0x80,0,0,0,0\n"
135 #define P6_NOP8 ".byte 0x0f,0x1f,0x84,0x00,0,0,0,0\n"
137 #define ASM_NOP_MAX 8
139 static inline void prefetchw(void *x)
141 alternative_input("prefetcht0 (%1)",
148 #define stack_current() \
150 struct thread_info *ti; \
151 asm("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK)); \
156 #endif /* __ASM_X86_64_PROCESSOR_H */