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-rw-r--r--include/asm-i386/paravirt.h505
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diff --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h
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1#ifndef __ASM_PARAVIRT_H
2#define __ASM_PARAVIRT_H
3/* Various instructions on x86 need to be replaced for
4 * para-virtualization: those hooks are defined here. */
5#include <linux/linkage.h>
6#include <linux/stringify.h>
7#include <asm/page.h>
8
9#ifdef CONFIG_PARAVIRT
10/* These are the most performance critical ops, so we want to be able to patch
11 * callers */
12#define PARAVIRT_IRQ_DISABLE 0
13#define PARAVIRT_IRQ_ENABLE 1
14#define PARAVIRT_RESTORE_FLAGS 2
15#define PARAVIRT_SAVE_FLAGS 3
16#define PARAVIRT_SAVE_FLAGS_IRQ_DISABLE 4
17#define PARAVIRT_INTERRUPT_RETURN 5
18#define PARAVIRT_STI_SYSEXIT 6
19
20/* Bitmask of what can be clobbered: usually at least eax. */
21#define CLBR_NONE 0x0
22#define CLBR_EAX 0x1
23#define CLBR_ECX 0x2
24#define CLBR_EDX 0x4
25#define CLBR_ANY 0x7
26
27#ifndef __ASSEMBLY__
28struct thread_struct;
29struct Xgt_desc_struct;
30struct tss_struct;
31struct mm_struct;
32struct paravirt_ops
33{
34 unsigned int kernel_rpl;
35 int paravirt_enabled;
36 const char *name;
37
38 /*
39 * Patch may replace one of the defined code sequences with arbitrary
40 * code, subject to the same register constraints. This generally
41 * means the code is not free to clobber any registers other than EAX.
42 * The patch function should return the number of bytes of code
43 * generated, as we nop pad the rest in generic code.
44 */
45 unsigned (*patch)(u8 type, u16 clobber, void *firstinsn, unsigned len);
46
47 void (*arch_setup)(void);
48 char *(*memory_setup)(void);
49 void (*init_IRQ)(void);
50
51 void (*banner)(void);
52
53 unsigned long (*get_wallclock)(void);
54 int (*set_wallclock)(unsigned long);
55 void (*time_init)(void);
56
57 /* All the function pointers here are declared as "fastcall"
58 so that we get a specific register-based calling
59 convention. This makes it easier to implement inline
60 assembler replacements. */
61
62 void (fastcall *cpuid)(unsigned int *eax, unsigned int *ebx,
63 unsigned int *ecx, unsigned int *edx);
64
65 unsigned long (fastcall *get_debugreg)(int regno);
66 void (fastcall *set_debugreg)(int regno, unsigned long value);
67
68 void (fastcall *clts)(void);
69
70 unsigned long (fastcall *read_cr0)(void);
71 void (fastcall *write_cr0)(unsigned long);
72
73 unsigned long (fastcall *read_cr2)(void);
74 void (fastcall *write_cr2)(unsigned long);
75
76 unsigned long (fastcall *read_cr3)(void);
77 void (fastcall *write_cr3)(unsigned long);
78
79 unsigned long (fastcall *read_cr4_safe)(void);
80 unsigned long (fastcall *read_cr4)(void);
81 void (fastcall *write_cr4)(unsigned long);
82
83 unsigned long (fastcall *save_fl)(void);
84 void (fastcall *restore_fl)(unsigned long);
85 void (fastcall *irq_disable)(void);
86 void (fastcall *irq_enable)(void);
87 void (fastcall *safe_halt)(void);
88 void (fastcall *halt)(void);
89 void (fastcall *wbinvd)(void);
90
91 /* err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
92 u64 (fastcall *read_msr)(unsigned int msr, int *err);
93 int (fastcall *write_msr)(unsigned int msr, u64 val);
94
95 u64 (fastcall *read_tsc)(void);
96 u64 (fastcall *read_pmc)(void);
97
98 void (fastcall *load_tr_desc)(void);
99 void (fastcall *load_gdt)(const struct Xgt_desc_struct *);
100 void (fastcall *load_idt)(const struct Xgt_desc_struct *);
101 void (fastcall *store_gdt)(struct Xgt_desc_struct *);
102 void (fastcall *store_idt)(struct Xgt_desc_struct *);
103 void (fastcall *set_ldt)(const void *desc, unsigned entries);
104 unsigned long (fastcall *store_tr)(void);
105 void (fastcall *load_tls)(struct thread_struct *t, unsigned int cpu);
106 void (fastcall *write_ldt_entry)(void *dt, int entrynum,
107 u32 low, u32 high);
108 void (fastcall *write_gdt_entry)(void *dt, int entrynum,
109 u32 low, u32 high);
110 void (fastcall *write_idt_entry)(void *dt, int entrynum,
111 u32 low, u32 high);
112 void (fastcall *load_esp0)(struct tss_struct *tss,
113 struct thread_struct *thread);
114
115 void (fastcall *set_iopl_mask)(unsigned mask);
116
117 void (fastcall *io_delay)(void);
118 void (*const_udelay)(unsigned long loops);
119
120#ifdef CONFIG_X86_LOCAL_APIC
121 void (fastcall *apic_write)(unsigned long reg, unsigned long v);
122 void (fastcall *apic_write_atomic)(unsigned long reg, unsigned long v);
123 unsigned long (fastcall *apic_read)(unsigned long reg);
124#endif
125
126 void (fastcall *flush_tlb_user)(void);
127 void (fastcall *flush_tlb_kernel)(void);
128 void (fastcall *flush_tlb_single)(u32 addr);
129
130 void (fastcall *set_pte)(pte_t *ptep, pte_t pteval);
131 void (fastcall *set_pte_at)(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pteval);
132 void (fastcall *set_pmd)(pmd_t *pmdp, pmd_t pmdval);
133 void (fastcall *pte_update)(struct mm_struct *mm, u32 addr, pte_t *ptep);
134 void (fastcall *pte_update_defer)(struct mm_struct *mm, u32 addr, pte_t *ptep);
135#ifdef CONFIG_X86_PAE
136 void (fastcall *set_pte_atomic)(pte_t *ptep, pte_t pteval);
137 void (fastcall *set_pte_present)(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte);
138 void (fastcall *set_pud)(pud_t *pudp, pud_t pudval);
139 void (fastcall *pte_clear)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
140 void (fastcall *pmd_clear)(pmd_t *pmdp);
141#endif
142
143 /* These two are jmp to, not actually called. */
144 void (fastcall *irq_enable_sysexit)(void);
145 void (fastcall *iret)(void);
146};
147
148/* Mark a paravirt probe function. */
149#define paravirt_probe(fn) \
150 static asmlinkage void (*__paravirtprobe_##fn)(void) __attribute_used__ \
151 __attribute__((__section__(".paravirtprobe"))) = fn
152
153extern struct paravirt_ops paravirt_ops;
154
155#define paravirt_enabled() (paravirt_ops.paravirt_enabled)
156
157static inline void load_esp0(struct tss_struct *tss,
158 struct thread_struct *thread)
159{
160 paravirt_ops.load_esp0(tss, thread);
161}
162
163#define ARCH_SETUP paravirt_ops.arch_setup();
164static inline unsigned long get_wallclock(void)
165{
166 return paravirt_ops.get_wallclock();
167}
168
169static inline int set_wallclock(unsigned long nowtime)
170{
171 return paravirt_ops.set_wallclock(nowtime);
172}
173
174static inline void do_time_init(void)
175{
176 return paravirt_ops.time_init();
177}
178
179/* The paravirtualized CPUID instruction. */
180static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
181 unsigned int *ecx, unsigned int *edx)
182{
183 paravirt_ops.cpuid(eax, ebx, ecx, edx);
184}
185
186/*
187 * These special macros can be used to get or set a debugging register
188 */
189#define get_debugreg(var, reg) var = paravirt_ops.get_debugreg(reg)
190#define set_debugreg(val, reg) paravirt_ops.set_debugreg(reg, val)
191
192#define clts() paravirt_ops.clts()
193
194#define read_cr0() paravirt_ops.read_cr0()
195#define write_cr0(x) paravirt_ops.write_cr0(x)
196
197#define read_cr2() paravirt_ops.read_cr2()
198#define write_cr2(x) paravirt_ops.write_cr2(x)
199
200#define read_cr3() paravirt_ops.read_cr3()
201#define write_cr3(x) paravirt_ops.write_cr3(x)
202
203#define read_cr4() paravirt_ops.read_cr4()
204#define read_cr4_safe(x) paravirt_ops.read_cr4_safe()
205#define write_cr4(x) paravirt_ops.write_cr4(x)
206
207static inline void raw_safe_halt(void)
208{
209 paravirt_ops.safe_halt();
210}
211
212static inline void halt(void)
213{
214 paravirt_ops.safe_halt();
215}
216#define wbinvd() paravirt_ops.wbinvd()
217
218#define get_kernel_rpl() (paravirt_ops.kernel_rpl)
219
220#define rdmsr(msr,val1,val2) do { \
221 int _err; \
222 u64 _l = paravirt_ops.read_msr(msr,&_err); \
223 val1 = (u32)_l; \
224 val2 = _l >> 32; \
225} while(0)
226
227#define wrmsr(msr,val1,val2) do { \
228 u64 _l = ((u64)(val2) << 32) | (val1); \
229 paravirt_ops.write_msr((msr), _l); \
230} while(0)
231
232#define rdmsrl(msr,val) do { \
233 int _err; \
234 val = paravirt_ops.read_msr((msr),&_err); \
235} while(0)
236
237#define wrmsrl(msr,val) (paravirt_ops.write_msr((msr),(val)))
238#define wrmsr_safe(msr,a,b) ({ \
239 u64 _l = ((u64)(b) << 32) | (a); \
240 paravirt_ops.write_msr((msr),_l); \
241})
242
243/* rdmsr with exception handling */
244#define rdmsr_safe(msr,a,b) ({ \
245 int _err; \
246 u64 _l = paravirt_ops.read_msr(msr,&_err); \
247 (*a) = (u32)_l; \
248 (*b) = _l >> 32; \
249 _err; })
250
251#define rdtsc(low,high) do { \
252 u64 _l = paravirt_ops.read_tsc(); \
253 low = (u32)_l; \
254 high = _l >> 32; \
255} while(0)
256
257#define rdtscl(low) do { \
258 u64 _l = paravirt_ops.read_tsc(); \
259 low = (int)_l; \
260} while(0)
261
262#define rdtscll(val) (val = paravirt_ops.read_tsc())
263
264#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
265
266#define rdpmc(counter,low,high) do { \
267 u64 _l = paravirt_ops.read_pmc(); \
268 low = (u32)_l; \
269 high = _l >> 32; \
270} while(0)
271
272#define load_TR_desc() (paravirt_ops.load_tr_desc())
273#define load_gdt(dtr) (paravirt_ops.load_gdt(dtr))
274#define load_idt(dtr) (paravirt_ops.load_idt(dtr))
275#define set_ldt(addr, entries) (paravirt_ops.set_ldt((addr), (entries)))
276#define store_gdt(dtr) (paravirt_ops.store_gdt(dtr))
277#define store_idt(dtr) (paravirt_ops.store_idt(dtr))
278#define store_tr(tr) ((tr) = paravirt_ops.store_tr())
279#define load_TLS(t,cpu) (paravirt_ops.load_tls((t),(cpu)))
280#define write_ldt_entry(dt, entry, low, high) \
281 (paravirt_ops.write_ldt_entry((dt), (entry), (low), (high)))
282#define write_gdt_entry(dt, entry, low, high) \
283 (paravirt_ops.write_gdt_entry((dt), (entry), (low), (high)))
284#define write_idt_entry(dt, entry, low, high) \
285 (paravirt_ops.write_idt_entry((dt), (entry), (low), (high)))
286#define set_iopl_mask(mask) (paravirt_ops.set_iopl_mask(mask))
287
288/* The paravirtualized I/O functions */
289static inline void slow_down_io(void) {
290 paravirt_ops.io_delay();
291#ifdef REALLY_SLOW_IO
292 paravirt_ops.io_delay();
293 paravirt_ops.io_delay();
294 paravirt_ops.io_delay();
295#endif
296}
297
298#ifdef CONFIG_X86_LOCAL_APIC
299/*
300 * Basic functions accessing APICs.
301 */
302static inline void apic_write(unsigned long reg, unsigned long v)
303{
304 paravirt_ops.apic_write(reg,v);
305}
306
307static inline void apic_write_atomic(unsigned long reg, unsigned long v)
308{
309 paravirt_ops.apic_write_atomic(reg,v);
310}
311
312static inline unsigned long apic_read(unsigned long reg)
313{
314 return paravirt_ops.apic_read(reg);
315}
316#endif
317
318
319#define __flush_tlb() paravirt_ops.flush_tlb_user()
320#define __flush_tlb_global() paravirt_ops.flush_tlb_kernel()
321#define __flush_tlb_single(addr) paravirt_ops.flush_tlb_single(addr)
322
323static inline void set_pte(pte_t *ptep, pte_t pteval)
324{
325 paravirt_ops.set_pte(ptep, pteval);
326}
327
328static inline void set_pte_at(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pteval)
329{
330 paravirt_ops.set_pte_at(mm, addr, ptep, pteval);
331}
332
333static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
334{
335 paravirt_ops.set_pmd(pmdp, pmdval);
336}
337
338static inline void pte_update(struct mm_struct *mm, u32 addr, pte_t *ptep)
339{
340 paravirt_ops.pte_update(mm, addr, ptep);
341}
342
343static inline void pte_update_defer(struct mm_struct *mm, u32 addr, pte_t *ptep)
344{
345 paravirt_ops.pte_update_defer(mm, addr, ptep);
346}
347
348#ifdef CONFIG_X86_PAE
349static inline void set_pte_atomic(pte_t *ptep, pte_t pteval)
350{
351 paravirt_ops.set_pte_atomic(ptep, pteval);
352}
353
354static inline void set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
355{
356 paravirt_ops.set_pte_present(mm, addr, ptep, pte);
357}
358
359static inline void set_pud(pud_t *pudp, pud_t pudval)
360{
361 paravirt_ops.set_pud(pudp, pudval);
362}
363
364static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
365{
366 paravirt_ops.pte_clear(mm, addr, ptep);
367}
368
369static inline void pmd_clear(pmd_t *pmdp)
370{
371 paravirt_ops.pmd_clear(pmdp);
372}
373#endif
374
375/* These all sit in the .parainstructions section to tell us what to patch. */
376struct paravirt_patch {
377 u8 *instr; /* original instructions */
378 u8 instrtype; /* type of this instruction */
379 u8 len; /* length of original instruction */
380 u16 clobbers; /* what registers you may clobber */
381};
382
383#define paravirt_alt(insn_string, typenum, clobber) \
384 "771:\n\t" insn_string "\n" "772:\n" \
385 ".pushsection .parainstructions,\"a\"\n" \
386 " .long 771b\n" \
387 " .byte " __stringify(typenum) "\n" \
388 " .byte 772b-771b\n" \
389 " .short " __stringify(clobber) "\n" \
390 ".popsection"
391
392static inline unsigned long __raw_local_save_flags(void)
393{
394 unsigned long f;
395
396 __asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
397 "call *%1;"
398 "popl %%edx; popl %%ecx",
399 PARAVIRT_SAVE_FLAGS, CLBR_NONE)
400 : "=a"(f): "m"(paravirt_ops.save_fl)
401 : "memory", "cc");
402 return f;
403}
404
405static inline void raw_local_irq_restore(unsigned long f)
406{
407 __asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
408 "call *%1;"
409 "popl %%edx; popl %%ecx",
410 PARAVIRT_RESTORE_FLAGS, CLBR_EAX)
411 : "=a"(f) : "m" (paravirt_ops.restore_fl), "0"(f)
412 : "memory", "cc");
413}
414
415static inline void raw_local_irq_disable(void)
416{
417 __asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
418 "call *%0;"
419 "popl %%edx; popl %%ecx",
420 PARAVIRT_IRQ_DISABLE, CLBR_EAX)
421 : : "m" (paravirt_ops.irq_disable)
422 : "memory", "eax", "cc");
423}
424
425static inline void raw_local_irq_enable(void)
426{
427 __asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
428 "call *%0;"
429 "popl %%edx; popl %%ecx",
430 PARAVIRT_IRQ_ENABLE, CLBR_EAX)
431 : : "m" (paravirt_ops.irq_enable)
432 : "memory", "eax", "cc");
433}
434
435static inline unsigned long __raw_local_irq_save(void)
436{
437 unsigned long f;
438
439 __asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
440 "call *%1; pushl %%eax;"
441 "call *%2; popl %%eax;"
442 "popl %%edx; popl %%ecx",
443 PARAVIRT_SAVE_FLAGS_IRQ_DISABLE,
444 CLBR_NONE)
445 : "=a"(f)
446 : "m" (paravirt_ops.save_fl),
447 "m" (paravirt_ops.irq_disable)
448 : "memory", "cc");
449 return f;
450}
451
452#define CLI_STRING paravirt_alt("pushl %%ecx; pushl %%edx;" \
453 "call *paravirt_ops+%c[irq_disable];" \
454 "popl %%edx; popl %%ecx", \
455 PARAVIRT_IRQ_DISABLE, CLBR_EAX)
456
457#define STI_STRING paravirt_alt("pushl %%ecx; pushl %%edx;" \
458 "call *paravirt_ops+%c[irq_enable];" \
459 "popl %%edx; popl %%ecx", \
460 PARAVIRT_IRQ_ENABLE, CLBR_EAX)
461#define CLI_STI_CLOBBERS , "%eax"
462#define CLI_STI_INPUT_ARGS \
463 , \
464 [irq_disable] "i" (offsetof(struct paravirt_ops, irq_disable)), \
465 [irq_enable] "i" (offsetof(struct paravirt_ops, irq_enable))
466
467#else /* __ASSEMBLY__ */
468
469#define PARA_PATCH(ptype, clobbers, ops) \
470771:; \
471 ops; \
472772:; \
473 .pushsection .parainstructions,"a"; \
474 .long 771b; \
475 .byte ptype; \
476 .byte 772b-771b; \
477 .short clobbers; \
478 .popsection
479
480#define INTERRUPT_RETURN \
481 PARA_PATCH(PARAVIRT_INTERRUPT_RETURN, CLBR_ANY, \
482 jmp *%cs:paravirt_ops+PARAVIRT_iret)
483
484#define DISABLE_INTERRUPTS(clobbers) \
485 PARA_PATCH(PARAVIRT_IRQ_DISABLE, clobbers, \
486 pushl %ecx; pushl %edx; \
487 call *paravirt_ops+PARAVIRT_irq_disable; \
488 popl %edx; popl %ecx) \
489
490#define ENABLE_INTERRUPTS(clobbers) \
491 PARA_PATCH(PARAVIRT_IRQ_ENABLE, clobbers, \
492 pushl %ecx; pushl %edx; \
493 call *%cs:paravirt_ops+PARAVIRT_irq_enable; \
494 popl %edx; popl %ecx)
495
496#define ENABLE_INTERRUPTS_SYSEXIT \
497 PARA_PATCH(PARAVIRT_STI_SYSEXIT, CLBR_ANY, \
498 jmp *%cs:paravirt_ops+PARAVIRT_irq_enable_sysexit)
499
500#define GET_CR0_INTO_EAX \
501 call *paravirt_ops+PARAVIRT_read_cr0
502
503#endif /* __ASSEMBLY__ */
504#endif /* CONFIG_PARAVIRT */
505#endif /* __ASM_PARAVIRT_H */
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-10 04:39:46 -0500