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c758ecf6 GOC |
1 | #ifndef __ASM_X86_PROCESSOR_H |
2 | #define __ASM_X86_PROCESSOR_H | |
3 | ||
053de044 GOC |
4 | #include <asm/processor-flags.h> |
5 | ||
58f6f6ea IM |
6 | /* migration helpers, for KVM - will be removed in 2.6.25: */ |
7 | #include <asm/vm86.h> | |
8 | #define Xgt_desc_struct desc_ptr | |
9 | ||
683e0253 GOC |
10 | /* Forward declaration, a strange C thing */ |
11 | struct task_struct; | |
12 | struct mm_struct; | |
13 | ||
2f66dcc9 GOC |
14 | #include <asm/vm86.h> |
15 | #include <asm/math_emu.h> | |
16 | #include <asm/segment.h> | |
2f66dcc9 GOC |
17 | #include <asm/types.h> |
18 | #include <asm/sigcontext.h> | |
19 | #include <asm/current.h> | |
20 | #include <asm/cpufeature.h> | |
c72dcf83 | 21 | #include <asm/system.h> |
2f66dcc9 | 22 | #include <asm/page.h> |
5300db88 | 23 | #include <asm/percpu.h> |
2f66dcc9 GOC |
24 | #include <asm/msr.h> |
25 | #include <asm/desc_defs.h> | |
bd61643e | 26 | #include <asm/nops.h> |
2f66dcc9 | 27 | #include <linux/personality.h> |
5300db88 GOC |
28 | #include <linux/cpumask.h> |
29 | #include <linux/cache.h> | |
2f66dcc9 GOC |
30 | #include <linux/threads.h> |
31 | #include <linux/init.h> | |
c72dcf83 | 32 | |
0ccb8acc GOC |
33 | /* |
34 | * Default implementation of macro that returns current | |
35 | * instruction pointer ("program counter"). | |
36 | */ | |
37 | static inline void *current_text_addr(void) | |
38 | { | |
39 | void *pc; | |
40 | asm volatile("mov $1f,%0\n1:":"=r" (pc)); | |
41 | return pc; | |
42 | } | |
43 | ||
dbcb4660 GOC |
44 | #ifdef CONFIG_X86_VSMP |
45 | #define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT) | |
46 | #define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT) | |
47 | #else | |
48 | #define ARCH_MIN_TASKALIGN 16 | |
49 | #define ARCH_MIN_MMSTRUCT_ALIGN 0 | |
50 | #endif | |
51 | ||
5300db88 GOC |
52 | /* |
53 | * CPU type and hardware bug flags. Kept separately for each CPU. | |
54 | * Members of this structure are referenced in head.S, so think twice | |
55 | * before touching them. [mj] | |
56 | */ | |
57 | ||
58 | struct cpuinfo_x86 { | |
59 | __u8 x86; /* CPU family */ | |
60 | __u8 x86_vendor; /* CPU vendor */ | |
61 | __u8 x86_model; | |
62 | __u8 x86_mask; | |
63 | #ifdef CONFIG_X86_32 | |
64 | char wp_works_ok; /* It doesn't on 386's */ | |
65 | char hlt_works_ok; /* Problems on some 486Dx4's and old 386's */ | |
66 | char hard_math; | |
67 | char rfu; | |
68 | char fdiv_bug; | |
69 | char f00f_bug; | |
70 | char coma_bug; | |
71 | char pad0; | |
72 | #else | |
73 | /* number of 4K pages in DTLB/ITLB combined(in pages)*/ | |
74 | int x86_tlbsize; | |
75 | __u8 x86_virt_bits, x86_phys_bits; | |
76 | /* cpuid returned core id bits */ | |
77 | __u8 x86_coreid_bits; | |
78 | /* Max extended CPUID function supported */ | |
79 | __u32 extended_cpuid_level; | |
80 | #endif | |
81 | int cpuid_level; /* Maximum supported CPUID level, -1=no CPUID */ | |
82 | __u32 x86_capability[NCAPINTS]; | |
83 | char x86_vendor_id[16]; | |
84 | char x86_model_id[64]; | |
85 | int x86_cache_size; /* in KB - valid for CPUS which support this | |
86 | call */ | |
87 | int x86_cache_alignment; /* In bytes */ | |
88 | int x86_power; | |
89 | unsigned long loops_per_jiffy; | |
90 | #ifdef CONFIG_SMP | |
91 | cpumask_t llc_shared_map; /* cpus sharing the last level cache */ | |
92 | #endif | |
ef97001f | 93 | u16 x86_max_cores; /* cpuid returned max cores value */ |
94 | u16 apicid; | |
95 | u16 x86_clflush_size; | |
5300db88 | 96 | #ifdef CONFIG_SMP |
ef97001f | 97 | u16 booted_cores; /* number of cores as seen by OS */ |
98 | u16 phys_proc_id; /* Physical processor id. */ | |
99 | u16 cpu_core_id; /* Core id */ | |
100 | u16 cpu_index; /* index into per_cpu list */ | |
5300db88 GOC |
101 | #endif |
102 | } __attribute__((__aligned__(SMP_CACHE_BYTES))); | |
103 | ||
104 | #define X86_VENDOR_INTEL 0 | |
105 | #define X86_VENDOR_CYRIX 1 | |
106 | #define X86_VENDOR_AMD 2 | |
107 | #define X86_VENDOR_UMC 3 | |
108 | #define X86_VENDOR_NEXGEN 4 | |
109 | #define X86_VENDOR_CENTAUR 5 | |
110 | #define X86_VENDOR_TRANSMETA 7 | |
111 | #define X86_VENDOR_NSC 8 | |
112 | #define X86_VENDOR_NUM 9 | |
113 | #define X86_VENDOR_UNKNOWN 0xff | |
114 | ||
1a53905a GOC |
115 | /* |
116 | * capabilities of CPUs | |
117 | */ | |
5300db88 | 118 | extern struct cpuinfo_x86 boot_cpu_data; |
1a53905a GOC |
119 | extern struct cpuinfo_x86 new_cpu_data; |
120 | extern struct tss_struct doublefault_tss; | |
7d851c8d | 121 | extern __u32 cleared_cpu_caps[NCAPINTS]; |
5300db88 GOC |
122 | |
123 | #ifdef CONFIG_SMP | |
124 | DECLARE_PER_CPU(struct cpuinfo_x86, cpu_info); | |
125 | #define cpu_data(cpu) per_cpu(cpu_info, cpu) | |
126 | #define current_cpu_data cpu_data(smp_processor_id()) | |
127 | #else | |
128 | #define cpu_data(cpu) boot_cpu_data | |
129 | #define current_cpu_data boot_cpu_data | |
130 | #endif | |
131 | ||
1a53905a GOC |
132 | void cpu_detect(struct cpuinfo_x86 *c); |
133 | ||
134 | extern void identify_cpu(struct cpuinfo_x86 *); | |
135 | extern void identify_boot_cpu(void); | |
136 | extern void identify_secondary_cpu(struct cpuinfo_x86 *); | |
5300db88 GOC |
137 | extern void print_cpu_info(struct cpuinfo_x86 *); |
138 | extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c); | |
139 | extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c); | |
140 | extern unsigned short num_cache_leaves; | |
141 | ||
1a53905a GOC |
142 | #if defined(CONFIG_X86_HT) || defined(CONFIG_X86_64) |
143 | extern void detect_ht(struct cpuinfo_x86 *c); | |
144 | #else | |
145 | static inline void detect_ht(struct cpuinfo_x86 *c) {} | |
146 | #endif | |
147 | ||
c758ecf6 GOC |
148 | static inline void native_cpuid(unsigned int *eax, unsigned int *ebx, |
149 | unsigned int *ecx, unsigned int *edx) | |
150 | { | |
151 | /* ecx is often an input as well as an output. */ | |
152 | __asm__("cpuid" | |
153 | : "=a" (*eax), | |
154 | "=b" (*ebx), | |
155 | "=c" (*ecx), | |
156 | "=d" (*edx) | |
157 | : "0" (*eax), "2" (*ecx)); | |
158 | } | |
159 | ||
c72dcf83 GOC |
160 | static inline void load_cr3(pgd_t *pgdir) |
161 | { | |
162 | write_cr3(__pa(pgdir)); | |
163 | } | |
c758ecf6 | 164 | |
ca241c75 GOC |
165 | #ifdef CONFIG_X86_32 |
166 | /* This is the TSS defined by the hardware. */ | |
167 | struct x86_hw_tss { | |
168 | unsigned short back_link, __blh; | |
169 | unsigned long sp0; | |
170 | unsigned short ss0, __ss0h; | |
171 | unsigned long sp1; | |
172 | unsigned short ss1, __ss1h; /* ss1 caches MSR_IA32_SYSENTER_CS */ | |
173 | unsigned long sp2; | |
174 | unsigned short ss2, __ss2h; | |
175 | unsigned long __cr3; | |
176 | unsigned long ip; | |
177 | unsigned long flags; | |
178 | unsigned long ax, cx, dx, bx; | |
179 | unsigned long sp, bp, si, di; | |
180 | unsigned short es, __esh; | |
181 | unsigned short cs, __csh; | |
182 | unsigned short ss, __ssh; | |
183 | unsigned short ds, __dsh; | |
184 | unsigned short fs, __fsh; | |
185 | unsigned short gs, __gsh; | |
186 | unsigned short ldt, __ldth; | |
187 | unsigned short trace, io_bitmap_base; | |
188 | } __attribute__((packed)); | |
189 | #else | |
190 | struct x86_hw_tss { | |
191 | u32 reserved1; | |
192 | u64 sp0; | |
193 | u64 sp1; | |
194 | u64 sp2; | |
195 | u64 reserved2; | |
196 | u64 ist[7]; | |
197 | u32 reserved3; | |
198 | u32 reserved4; | |
199 | u16 reserved5; | |
200 | u16 io_bitmap_base; | |
201 | } __attribute__((packed)) ____cacheline_aligned; | |
202 | #endif | |
203 | ||
204 | /* | |
205 | * Size of io_bitmap. | |
206 | */ | |
207 | #define IO_BITMAP_BITS 65536 | |
208 | #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) | |
209 | #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) | |
210 | #define IO_BITMAP_OFFSET offsetof(struct tss_struct, io_bitmap) | |
211 | #define INVALID_IO_BITMAP_OFFSET 0x8000 | |
212 | #define INVALID_IO_BITMAP_OFFSET_LAZY 0x9000 | |
213 | ||
214 | struct tss_struct { | |
215 | struct x86_hw_tss x86_tss; | |
216 | ||
217 | /* | |
218 | * The extra 1 is there because the CPU will access an | |
219 | * additional byte beyond the end of the IO permission | |
220 | * bitmap. The extra byte must be all 1 bits, and must | |
221 | * be within the limit. | |
222 | */ | |
223 | unsigned long io_bitmap[IO_BITMAP_LONGS + 1]; | |
224 | /* | |
225 | * Cache the current maximum and the last task that used the bitmap: | |
226 | */ | |
227 | unsigned long io_bitmap_max; | |
228 | struct thread_struct *io_bitmap_owner; | |
229 | /* | |
230 | * pads the TSS to be cacheline-aligned (size is 0x100) | |
231 | */ | |
232 | unsigned long __cacheline_filler[35]; | |
233 | /* | |
234 | * .. and then another 0x100 bytes for emergency kernel stack | |
235 | */ | |
236 | unsigned long stack[64]; | |
237 | } __attribute__((packed)); | |
238 | ||
239 | DECLARE_PER_CPU(struct tss_struct, init_tss); | |
240 | ||
1a53905a GOC |
241 | /* Save the original ist values for checking stack pointers during debugging */ |
242 | struct orig_ist { | |
243 | unsigned long ist[7]; | |
244 | }; | |
245 | ||
99f8ecdf | 246 | #define MXCSR_DEFAULT 0x1f80 |
46265df0 | 247 | |
99f8ecdf RM |
248 | struct i387_fsave_struct { |
249 | u32 cwd; | |
250 | u32 swd; | |
251 | u32 twd; | |
252 | u32 fip; | |
253 | u32 fcs; | |
254 | u32 foo; | |
255 | u32 fos; | |
256 | u32 st_space[20]; /* 8*10 bytes for each FP-reg = 80 bytes */ | |
257 | u32 status; /* software status information */ | |
46265df0 GOC |
258 | }; |
259 | ||
46265df0 GOC |
260 | struct i387_fxsave_struct { |
261 | u16 cwd; | |
262 | u16 swd; | |
263 | u16 twd; | |
264 | u16 fop; | |
99f8ecdf RM |
265 | union { |
266 | struct { | |
267 | u64 rip; | |
268 | u64 rdp; | |
269 | }; | |
270 | struct { | |
271 | u32 fip; | |
272 | u32 fcs; | |
273 | u32 foo; | |
274 | u32 fos; | |
275 | }; | |
276 | }; | |
46265df0 GOC |
277 | u32 mxcsr; |
278 | u32 mxcsr_mask; | |
279 | u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */ | |
280 | u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */ | |
281 | u32 padding[24]; | |
282 | } __attribute__((aligned(16))); | |
283 | ||
99f8ecdf RM |
284 | struct i387_soft_struct { |
285 | u32 cwd; | |
286 | u32 swd; | |
287 | u32 twd; | |
288 | u32 fip; | |
289 | u32 fcs; | |
290 | u32 foo; | |
291 | u32 fos; | |
292 | u32 st_space[20]; /* 8*10 bytes for each FP-reg = 80 bytes */ | |
293 | u8 ftop, changed, lookahead, no_update, rm, alimit; | |
294 | struct info *info; | |
295 | u32 entry_eip; | |
296 | }; | |
297 | ||
46265df0 | 298 | union i387_union { |
99f8ecdf | 299 | struct i387_fsave_struct fsave; |
46265df0 | 300 | struct i387_fxsave_struct fxsave; |
99f8ecdf | 301 | struct i387_soft_struct soft; |
46265df0 GOC |
302 | }; |
303 | ||
99f8ecdf | 304 | #ifdef CONFIG_X86_32 |
2f66dcc9 | 305 | DECLARE_PER_CPU(u8, cpu_llc_id); |
99f8ecdf | 306 | #else |
2f66dcc9 | 307 | DECLARE_PER_CPU(struct orig_ist, orig_ist); |
96a388de | 308 | #endif |
c758ecf6 | 309 | |
683e0253 GOC |
310 | extern void print_cpu_info(struct cpuinfo_x86 *); |
311 | extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c); | |
312 | extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c); | |
313 | extern unsigned short num_cache_leaves; | |
314 | ||
cb38d377 GOC |
315 | struct thread_struct { |
316 | /* cached TLS descriptors. */ | |
317 | struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES]; | |
318 | unsigned long sp0; | |
319 | unsigned long sp; | |
320 | #ifdef CONFIG_X86_32 | |
321 | unsigned long sysenter_cs; | |
322 | #else | |
323 | unsigned long usersp; /* Copy from PDA */ | |
324 | unsigned short es, ds, fsindex, gsindex; | |
325 | #endif | |
326 | unsigned long ip; | |
327 | unsigned long fs; | |
328 | unsigned long gs; | |
329 | /* Hardware debugging registers */ | |
330 | unsigned long debugreg0; | |
331 | unsigned long debugreg1; | |
332 | unsigned long debugreg2; | |
333 | unsigned long debugreg3; | |
334 | unsigned long debugreg6; | |
335 | unsigned long debugreg7; | |
336 | /* fault info */ | |
337 | unsigned long cr2, trap_no, error_code; | |
338 | /* floating point info */ | |
339 | union i387_union i387 __attribute__((aligned(16)));; | |
340 | #ifdef CONFIG_X86_32 | |
341 | /* virtual 86 mode info */ | |
342 | struct vm86_struct __user *vm86_info; | |
343 | unsigned long screen_bitmap; | |
344 | unsigned long v86flags, v86mask, saved_sp0; | |
345 | unsigned int saved_fs, saved_gs; | |
346 | #endif | |
347 | /* IO permissions */ | |
348 | unsigned long *io_bitmap_ptr; | |
349 | unsigned long iopl; | |
350 | /* max allowed port in the bitmap, in bytes: */ | |
351 | unsigned io_bitmap_max; | |
352 | /* MSR_IA32_DEBUGCTLMSR value to switch in if TIF_DEBUGCTLMSR is set. */ | |
353 | unsigned long debugctlmsr; | |
354 | /* Debug Store - if not 0 points to a DS Save Area configuration; | |
355 | * goes into MSR_IA32_DS_AREA */ | |
356 | unsigned long ds_area_msr; | |
357 | }; | |
358 | ||
1b46cbe0 GOC |
359 | static inline unsigned long native_get_debugreg(int regno) |
360 | { | |
361 | unsigned long val = 0; /* Damn you, gcc! */ | |
362 | ||
363 | switch (regno) { | |
364 | case 0: | |
365 | asm("mov %%db0, %0" :"=r" (val)); break; | |
366 | case 1: | |
367 | asm("mov %%db1, %0" :"=r" (val)); break; | |
368 | case 2: | |
369 | asm("mov %%db2, %0" :"=r" (val)); break; | |
370 | case 3: | |
371 | asm("mov %%db3, %0" :"=r" (val)); break; | |
372 | case 6: | |
373 | asm("mov %%db6, %0" :"=r" (val)); break; | |
374 | case 7: | |
375 | asm("mov %%db7, %0" :"=r" (val)); break; | |
376 | default: | |
377 | BUG(); | |
378 | } | |
379 | return val; | |
380 | } | |
381 | ||
382 | static inline void native_set_debugreg(int regno, unsigned long value) | |
383 | { | |
384 | switch (regno) { | |
385 | case 0: | |
386 | asm("mov %0,%%db0" : /* no output */ :"r" (value)); | |
387 | break; | |
388 | case 1: | |
389 | asm("mov %0,%%db1" : /* no output */ :"r" (value)); | |
390 | break; | |
391 | case 2: | |
392 | asm("mov %0,%%db2" : /* no output */ :"r" (value)); | |
393 | break; | |
394 | case 3: | |
395 | asm("mov %0,%%db3" : /* no output */ :"r" (value)); | |
396 | break; | |
397 | case 6: | |
398 | asm("mov %0,%%db6" : /* no output */ :"r" (value)); | |
399 | break; | |
400 | case 7: | |
401 | asm("mov %0,%%db7" : /* no output */ :"r" (value)); | |
402 | break; | |
403 | default: | |
404 | BUG(); | |
405 | } | |
406 | } | |
407 | ||
62d7d7ed GOC |
408 | /* |
409 | * Set IOPL bits in EFLAGS from given mask | |
410 | */ | |
411 | static inline void native_set_iopl_mask(unsigned mask) | |
412 | { | |
413 | #ifdef CONFIG_X86_32 | |
414 | unsigned int reg; | |
415 | __asm__ __volatile__ ("pushfl;" | |
416 | "popl %0;" | |
417 | "andl %1, %0;" | |
418 | "orl %2, %0;" | |
419 | "pushl %0;" | |
420 | "popfl" | |
421 | : "=&r" (reg) | |
422 | : "i" (~X86_EFLAGS_IOPL), "r" (mask)); | |
423 | #endif | |
424 | } | |
425 | ||
7818a1e0 GOC |
426 | static inline void native_load_sp0(struct tss_struct *tss, |
427 | struct thread_struct *thread) | |
428 | { | |
429 | tss->x86_tss.sp0 = thread->sp0; | |
430 | #ifdef CONFIG_X86_32 | |
431 | /* Only happens when SEP is enabled, no need to test "SEP"arately */ | |
432 | if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) { | |
433 | tss->x86_tss.ss1 = thread->sysenter_cs; | |
434 | wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0); | |
435 | } | |
436 | #endif | |
437 | } | |
1b46cbe0 | 438 | |
e801f864 GOC |
439 | static inline void native_swapgs(void) |
440 | { | |
441 | #ifdef CONFIG_X86_64 | |
442 | asm volatile("swapgs" ::: "memory"); | |
443 | #endif | |
444 | } | |
445 | ||
7818a1e0 GOC |
446 | #ifdef CONFIG_PARAVIRT |
447 | #include <asm/paravirt.h> | |
448 | #else | |
c758ecf6 | 449 | #define __cpuid native_cpuid |
1b46cbe0 GOC |
450 | #define paravirt_enabled() 0 |
451 | ||
452 | /* | |
453 | * These special macros can be used to get or set a debugging register | |
454 | */ | |
455 | #define get_debugreg(var, register) \ | |
456 | (var) = native_get_debugreg(register) | |
457 | #define set_debugreg(value, register) \ | |
458 | native_set_debugreg(register, value) | |
459 | ||
7818a1e0 GOC |
460 | static inline void load_sp0(struct tss_struct *tss, |
461 | struct thread_struct *thread) | |
462 | { | |
463 | native_load_sp0(tss, thread); | |
464 | } | |
465 | ||
62d7d7ed | 466 | #define set_iopl_mask native_set_iopl_mask |
e801f864 | 467 | #define SWAPGS swapgs |
1b46cbe0 GOC |
468 | #endif /* CONFIG_PARAVIRT */ |
469 | ||
470 | /* | |
471 | * Save the cr4 feature set we're using (ie | |
472 | * Pentium 4MB enable and PPro Global page | |
473 | * enable), so that any CPU's that boot up | |
474 | * after us can get the correct flags. | |
475 | */ | |
476 | extern unsigned long mmu_cr4_features; | |
477 | ||
478 | static inline void set_in_cr4(unsigned long mask) | |
479 | { | |
480 | unsigned cr4; | |
481 | mmu_cr4_features |= mask; | |
482 | cr4 = read_cr4(); | |
483 | cr4 |= mask; | |
484 | write_cr4(cr4); | |
485 | } | |
486 | ||
487 | static inline void clear_in_cr4(unsigned long mask) | |
488 | { | |
489 | unsigned cr4; | |
490 | mmu_cr4_features &= ~mask; | |
491 | cr4 = read_cr4(); | |
492 | cr4 &= ~mask; | |
493 | write_cr4(cr4); | |
494 | } | |
495 | ||
683e0253 GOC |
496 | struct microcode_header { |
497 | unsigned int hdrver; | |
498 | unsigned int rev; | |
499 | unsigned int date; | |
500 | unsigned int sig; | |
501 | unsigned int cksum; | |
502 | unsigned int ldrver; | |
503 | unsigned int pf; | |
504 | unsigned int datasize; | |
505 | unsigned int totalsize; | |
506 | unsigned int reserved[3]; | |
507 | }; | |
508 | ||
509 | struct microcode { | |
510 | struct microcode_header hdr; | |
511 | unsigned int bits[0]; | |
512 | }; | |
513 | ||
514 | typedef struct microcode microcode_t; | |
515 | typedef struct microcode_header microcode_header_t; | |
516 | ||
517 | /* microcode format is extended from prescott processors */ | |
518 | struct extended_signature { | |
519 | unsigned int sig; | |
520 | unsigned int pf; | |
521 | unsigned int cksum; | |
522 | }; | |
523 | ||
524 | struct extended_sigtable { | |
525 | unsigned int count; | |
526 | unsigned int cksum; | |
527 | unsigned int reserved[3]; | |
528 | struct extended_signature sigs[0]; | |
529 | }; | |
530 | ||
fc87e906 GOC |
531 | typedef struct { |
532 | unsigned long seg; | |
533 | } mm_segment_t; | |
534 | ||
535 | ||
683e0253 GOC |
536 | /* |
537 | * create a kernel thread without removing it from tasklists | |
538 | */ | |
539 | extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); | |
540 | ||
541 | /* Free all resources held by a thread. */ | |
542 | extern void release_thread(struct task_struct *); | |
543 | ||
544 | /* Prepare to copy thread state - unlazy all lazy status */ | |
545 | extern void prepare_to_copy(struct task_struct *tsk); | |
1b46cbe0 | 546 | |
683e0253 | 547 | unsigned long get_wchan(struct task_struct *p); |
c758ecf6 GOC |
548 | |
549 | /* | |
550 | * Generic CPUID function | |
551 | * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx | |
552 | * resulting in stale register contents being returned. | |
553 | */ | |
554 | static inline void cpuid(unsigned int op, | |
555 | unsigned int *eax, unsigned int *ebx, | |
556 | unsigned int *ecx, unsigned int *edx) | |
557 | { | |
558 | *eax = op; | |
559 | *ecx = 0; | |
560 | __cpuid(eax, ebx, ecx, edx); | |
561 | } | |
562 | ||
563 | /* Some CPUID calls want 'count' to be placed in ecx */ | |
564 | static inline void cpuid_count(unsigned int op, int count, | |
565 | unsigned int *eax, unsigned int *ebx, | |
566 | unsigned int *ecx, unsigned int *edx) | |
567 | { | |
568 | *eax = op; | |
569 | *ecx = count; | |
570 | __cpuid(eax, ebx, ecx, edx); | |
571 | } | |
572 | ||
573 | /* | |
574 | * CPUID functions returning a single datum | |
575 | */ | |
576 | static inline unsigned int cpuid_eax(unsigned int op) | |
577 | { | |
578 | unsigned int eax, ebx, ecx, edx; | |
579 | ||
580 | cpuid(op, &eax, &ebx, &ecx, &edx); | |
581 | return eax; | |
582 | } | |
583 | static inline unsigned int cpuid_ebx(unsigned int op) | |
584 | { | |
585 | unsigned int eax, ebx, ecx, edx; | |
586 | ||
587 | cpuid(op, &eax, &ebx, &ecx, &edx); | |
588 | return ebx; | |
589 | } | |
590 | static inline unsigned int cpuid_ecx(unsigned int op) | |
591 | { | |
592 | unsigned int eax, ebx, ecx, edx; | |
593 | ||
594 | cpuid(op, &eax, &ebx, &ecx, &edx); | |
595 | return ecx; | |
596 | } | |
597 | static inline unsigned int cpuid_edx(unsigned int op) | |
598 | { | |
599 | unsigned int eax, ebx, ecx, edx; | |
600 | ||
601 | cpuid(op, &eax, &ebx, &ecx, &edx); | |
602 | return edx; | |
603 | } | |
604 | ||
683e0253 GOC |
605 | /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */ |
606 | static inline void rep_nop(void) | |
607 | { | |
608 | __asm__ __volatile__("rep;nop": : :"memory"); | |
609 | } | |
610 | ||
611 | /* Stop speculative execution */ | |
612 | static inline void sync_core(void) | |
613 | { | |
614 | int tmp; | |
615 | asm volatile("cpuid" : "=a" (tmp) : "0" (1) | |
616 | : "ebx", "ecx", "edx", "memory"); | |
617 | } | |
618 | ||
619 | #define cpu_relax() rep_nop() | |
620 | ||
621 | static inline void __monitor(const void *eax, unsigned long ecx, | |
622 | unsigned long edx) | |
623 | { | |
624 | /* "monitor %eax,%ecx,%edx;" */ | |
625 | asm volatile( | |
626 | ".byte 0x0f,0x01,0xc8;" | |
627 | : :"a" (eax), "c" (ecx), "d"(edx)); | |
628 | } | |
629 | ||
630 | static inline void __mwait(unsigned long eax, unsigned long ecx) | |
631 | { | |
632 | /* "mwait %eax,%ecx;" */ | |
633 | asm volatile( | |
634 | ".byte 0x0f,0x01,0xc9;" | |
635 | : :"a" (eax), "c" (ecx)); | |
636 | } | |
637 | ||
638 | static inline void __sti_mwait(unsigned long eax, unsigned long ecx) | |
639 | { | |
640 | /* "mwait %eax,%ecx;" */ | |
641 | asm volatile( | |
642 | "sti; .byte 0x0f,0x01,0xc9;" | |
643 | : :"a" (eax), "c" (ecx)); | |
644 | } | |
645 | ||
646 | extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx); | |
647 | ||
648 | extern int force_mwait; | |
649 | ||
650 | extern void select_idle_routine(const struct cpuinfo_x86 *c); | |
651 | ||
652 | extern unsigned long boot_option_idle_override; | |
653 | ||
1a53905a GOC |
654 | extern void enable_sep_cpu(void); |
655 | extern int sysenter_setup(void); | |
656 | ||
657 | /* Defined in head.S */ | |
658 | extern struct desc_ptr early_gdt_descr; | |
659 | ||
660 | extern void cpu_set_gdt(int); | |
661 | extern void switch_to_new_gdt(void); | |
662 | extern void cpu_init(void); | |
663 | extern void init_gdt(int cpu); | |
664 | ||
665 | /* from system description table in BIOS. Mostly for MCA use, but | |
666 | * others may find it useful. */ | |
667 | extern unsigned int machine_id; | |
668 | extern unsigned int machine_submodel_id; | |
669 | extern unsigned int BIOS_revision; | |
1a53905a | 670 | |
683e0253 GOC |
671 | /* Boot loader type from the setup header */ |
672 | extern int bootloader_type; | |
1a53905a GOC |
673 | |
674 | extern char ignore_fpu_irq; | |
683e0253 GOC |
675 | #define cache_line_size() (boot_cpu_data.x86_cache_alignment) |
676 | ||
677 | #define HAVE_ARCH_PICK_MMAP_LAYOUT 1 | |
678 | #define ARCH_HAS_PREFETCHW | |
679 | #define ARCH_HAS_SPINLOCK_PREFETCH | |
680 | ||
ae2e15eb GOC |
681 | #ifdef CONFIG_X86_32 |
682 | #define BASE_PREFETCH ASM_NOP4 | |
683 | #define ARCH_HAS_PREFETCH | |
684 | #else | |
685 | #define BASE_PREFETCH "prefetcht0 (%1)" | |
686 | #endif | |
687 | ||
688 | /* Prefetch instructions for Pentium III and AMD Athlon */ | |
689 | /* It's not worth to care about 3dnow! prefetches for the K6 | |
690 | because they are microcoded there and very slow. | |
691 | However we don't do prefetches for pre XP Athlons currently | |
692 | That should be fixed. */ | |
693 | static inline void prefetch(const void *x) | |
694 | { | |
695 | alternative_input(BASE_PREFETCH, | |
696 | "prefetchnta (%1)", | |
697 | X86_FEATURE_XMM, | |
698 | "r" (x)); | |
699 | } | |
700 | ||
701 | /* 3dnow! prefetch to get an exclusive cache line. Useful for | |
702 | spinlocks to avoid one state transition in the cache coherency protocol. */ | |
703 | static inline void prefetchw(const void *x) | |
704 | { | |
705 | alternative_input(BASE_PREFETCH, | |
706 | "prefetchw (%1)", | |
707 | X86_FEATURE_3DNOW, | |
708 | "r" (x)); | |
709 | } | |
710 | ||
683e0253 | 711 | #define spin_lock_prefetch(x) prefetchw(x) |
2f66dcc9 GOC |
712 | #ifdef CONFIG_X86_32 |
713 | /* | |
714 | * User space process size: 3GB (default). | |
715 | */ | |
716 | #define TASK_SIZE (PAGE_OFFSET) | |
922a70d3 DH |
717 | #define STACK_TOP TASK_SIZE |
718 | #define STACK_TOP_MAX STACK_TOP | |
2f66dcc9 GOC |
719 | |
720 | #define INIT_THREAD { \ | |
721 | .sp0 = sizeof(init_stack) + (long)&init_stack, \ | |
722 | .vm86_info = NULL, \ | |
723 | .sysenter_cs = __KERNEL_CS, \ | |
724 | .io_bitmap_ptr = NULL, \ | |
725 | .fs = __KERNEL_PERCPU, \ | |
726 | } | |
727 | ||
728 | /* | |
729 | * Note that the .io_bitmap member must be extra-big. This is because | |
730 | * the CPU will access an additional byte beyond the end of the IO | |
731 | * permission bitmap. The extra byte must be all 1 bits, and must | |
732 | * be within the limit. | |
733 | */ | |
734 | #define INIT_TSS { \ | |
735 | .x86_tss = { \ | |
736 | .sp0 = sizeof(init_stack) + (long)&init_stack, \ | |
737 | .ss0 = __KERNEL_DS, \ | |
738 | .ss1 = __KERNEL_CS, \ | |
739 | .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \ | |
740 | }, \ | |
741 | .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, \ | |
742 | } | |
743 | ||
744 | #define start_thread(regs, new_eip, new_esp) do { \ | |
745 | __asm__("movl %0,%%gs": :"r" (0)); \ | |
746 | regs->fs = 0; \ | |
747 | set_fs(USER_DS); \ | |
748 | regs->ds = __USER_DS; \ | |
749 | regs->es = __USER_DS; \ | |
750 | regs->ss = __USER_DS; \ | |
751 | regs->cs = __USER_CS; \ | |
752 | regs->ip = new_eip; \ | |
753 | regs->sp = new_esp; \ | |
754 | } while (0) | |
755 | ||
756 | ||
757 | extern unsigned long thread_saved_pc(struct task_struct *tsk); | |
758 | ||
759 | #define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long)) | |
760 | #define KSTK_TOP(info) \ | |
761 | ({ \ | |
762 | unsigned long *__ptr = (unsigned long *)(info); \ | |
763 | (unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \ | |
764 | }) | |
765 | ||
766 | /* | |
767 | * The below -8 is to reserve 8 bytes on top of the ring0 stack. | |
768 | * This is necessary to guarantee that the entire "struct pt_regs" | |
769 | * is accessable even if the CPU haven't stored the SS/ESP registers | |
770 | * on the stack (interrupt gate does not save these registers | |
771 | * when switching to the same priv ring). | |
772 | * Therefore beware: accessing the ss/esp fields of the | |
773 | * "struct pt_regs" is possible, but they may contain the | |
774 | * completely wrong values. | |
775 | */ | |
776 | #define task_pt_regs(task) \ | |
777 | ({ \ | |
778 | struct pt_regs *__regs__; \ | |
779 | __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \ | |
780 | __regs__ - 1; \ | |
781 | }) | |
782 | ||
783 | #define KSTK_ESP(task) (task_pt_regs(task)->sp) | |
784 | ||
785 | #else | |
786 | /* | |
787 | * User space process size. 47bits minus one guard page. | |
788 | */ | |
789 | #define TASK_SIZE64 (0x800000000000UL - 4096) | |
790 | ||
791 | /* This decides where the kernel will search for a free chunk of vm | |
792 | * space during mmap's. | |
793 | */ | |
794 | #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \ | |
795 | 0xc0000000 : 0xFFFFe000) | |
796 | ||
797 | #define TASK_SIZE (test_thread_flag(TIF_IA32) ? \ | |
798 | IA32_PAGE_OFFSET : TASK_SIZE64) | |
799 | #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? \ | |
800 | IA32_PAGE_OFFSET : TASK_SIZE64) | |
801 | ||
922a70d3 DH |
802 | #define STACK_TOP TASK_SIZE |
803 | #define STACK_TOP_MAX TASK_SIZE64 | |
804 | ||
2f66dcc9 GOC |
805 | #define INIT_THREAD { \ |
806 | .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \ | |
807 | } | |
808 | ||
809 | #define INIT_TSS { \ | |
810 | .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \ | |
811 | } | |
812 | ||
813 | #define start_thread(regs, new_rip, new_rsp) do { \ | |
814 | asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0)); \ | |
815 | load_gs_index(0); \ | |
816 | (regs)->ip = (new_rip); \ | |
817 | (regs)->sp = (new_rsp); \ | |
818 | write_pda(oldrsp, (new_rsp)); \ | |
819 | (regs)->cs = __USER_CS; \ | |
820 | (regs)->ss = __USER_DS; \ | |
821 | (regs)->flags = 0x200; \ | |
822 | set_fs(USER_DS); \ | |
823 | } while (0) | |
824 | ||
825 | /* | |
826 | * Return saved PC of a blocked thread. | |
827 | * What is this good for? it will be always the scheduler or ret_from_fork. | |
828 | */ | |
829 | #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8)) | |
830 | ||
831 | #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1) | |
832 | #define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */ | |
833 | #endif /* CONFIG_X86_64 */ | |
834 | ||
683e0253 GOC |
835 | /* This decides where the kernel will search for a free chunk of vm |
836 | * space during mmap's. | |
837 | */ | |
838 | #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) | |
839 | ||
840 | #define KSTK_EIP(task) (task_pt_regs(task)->ip) | |
841 | ||
c758ecf6 | 842 | #endif |