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 void identify_cpu(struct cpuinfo_x86 *);
24 * User space process size. 47bits minus one guard page.
26 #define TASK_SIZE64 (0x800000000000UL - 4096)
28 /* This decides where the kernel will search for a free chunk of vm
29 * space during mmap's.
31 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? 0xc0000000 : 0xFFFFe000)
33 #define TASK_SIZE (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE64)
34 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
37 struct i387_fxsave_struct {
46 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
47 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
49 } __attribute__ ((aligned (16)));
52 struct i387_fxsave_struct fxsave;
55 /* Save the original ist values for checking stack pointers during debugging */
59 DECLARE_PER_CPU(struct orig_ist, orig_ist);
61 #define INIT_THREAD { \
62 .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
66 .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
69 #define start_thread(regs,new_rip,new_rsp) do { \
70 asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0)); \
72 (regs)->ip = (new_rip); \
73 (regs)->sp = (new_rsp); \
74 write_pda(oldrsp, (new_rsp)); \
75 (regs)->cs = __USER_CS; \
76 (regs)->ss = __USER_DS; \
77 (regs)->flags = 0x200; \
82 * Return saved PC of a blocked thread.
83 * What is this good for? it will be always the scheduler or ret_from_fork.
85 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8))
87 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1)
88 #define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
91 #if defined(CONFIG_MPSC) || defined(CONFIG_MCORE2)
92 #define ASM_NOP1 P6_NOP1
93 #define ASM_NOP2 P6_NOP2
94 #define ASM_NOP3 P6_NOP3
95 #define ASM_NOP4 P6_NOP4
96 #define ASM_NOP5 P6_NOP5
97 #define ASM_NOP6 P6_NOP6
98 #define ASM_NOP7 P6_NOP7
99 #define ASM_NOP8 P6_NOP8
101 #define ASM_NOP1 K8_NOP1
102 #define ASM_NOP2 K8_NOP2
103 #define ASM_NOP3 K8_NOP3
104 #define ASM_NOP4 K8_NOP4
105 #define ASM_NOP5 K8_NOP5
106 #define ASM_NOP6 K8_NOP6
107 #define ASM_NOP7 K8_NOP7
108 #define ASM_NOP8 K8_NOP8
112 #define K8_NOP1 ".byte 0x90\n"
113 #define K8_NOP2 ".byte 0x66,0x90\n"
114 #define K8_NOP3 ".byte 0x66,0x66,0x90\n"
115 #define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n"
116 #define K8_NOP5 K8_NOP3 K8_NOP2
117 #define K8_NOP6 K8_NOP3 K8_NOP3
118 #define K8_NOP7 K8_NOP4 K8_NOP3
119 #define K8_NOP8 K8_NOP4 K8_NOP4
122 /* uses eax dependencies (Intel-recommended choice) */
123 #define P6_NOP1 ".byte 0x90\n"
124 #define P6_NOP2 ".byte 0x66,0x90\n"
125 #define P6_NOP3 ".byte 0x0f,0x1f,0x00\n"
126 #define P6_NOP4 ".byte 0x0f,0x1f,0x40,0\n"
127 #define P6_NOP5 ".byte 0x0f,0x1f,0x44,0x00,0\n"
128 #define P6_NOP6 ".byte 0x66,0x0f,0x1f,0x44,0x00,0\n"
129 #define P6_NOP7 ".byte 0x0f,0x1f,0x80,0,0,0,0\n"
130 #define P6_NOP8 ".byte 0x0f,0x1f,0x84,0x00,0,0,0,0\n"
132 #define ASM_NOP_MAX 8
134 static inline void prefetchw(void *x)
136 alternative_input("prefetcht0 (%1)",
142 #endif /* __ASM_X86_64_PROCESSOR_H */