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>
10 /* These are the most performance critical ops, so we want to be able to patch
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
20 /* Bitmask of what can be clobbered: usually at least eax. */
29 struct Xgt_desc_struct;
35 unsigned int kernel_rpl;
40 * Patch may replace one of the defined code sequences with arbitrary
41 * code, subject to the same register constraints. This generally
42 * means the code is not free to clobber any registers other than EAX.
43 * The patch function should return the number of bytes of code
44 * generated, as we nop pad the rest in generic code.
46 unsigned (*patch)(u8 type, u16 clobber, void *firstinsn, unsigned len);
48 void (*arch_setup)(void);
49 char *(*memory_setup)(void);
50 void (*init_IRQ)(void);
54 unsigned long (*get_wallclock)(void);
55 int (*set_wallclock)(unsigned long);
56 void (*time_init)(void);
58 /* All the function pointers here are declared as "fastcall"
59 so that we get a specific register-based calling
60 convention. This makes it easier to implement inline
61 assembler replacements. */
63 void (*cpuid)(unsigned int *eax, unsigned int *ebx,
64 unsigned int *ecx, unsigned int *edx);
66 unsigned long (*get_debugreg)(int regno);
67 void (*set_debugreg)(int regno, unsigned long value);
71 unsigned long (*read_cr0)(void);
72 void (*write_cr0)(unsigned long);
74 unsigned long (*read_cr2)(void);
75 void (*write_cr2)(unsigned long);
77 unsigned long (*read_cr3)(void);
78 void (*write_cr3)(unsigned long);
80 unsigned long (*read_cr4_safe)(void);
81 unsigned long (*read_cr4)(void);
82 void (*write_cr4)(unsigned long);
84 unsigned long (*save_fl)(void);
85 void (*restore_fl)(unsigned long);
86 void (*irq_disable)(void);
87 void (*irq_enable)(void);
88 void (*safe_halt)(void);
92 /* err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
93 u64 (*read_msr)(unsigned int msr, int *err);
94 int (*write_msr)(unsigned int msr, u64 val);
96 u64 (*read_tsc)(void);
97 u64 (*read_pmc)(void);
98 u64 (*get_scheduled_cycles)(void);
99 unsigned long (*get_cpu_khz)(void);
101 void (*load_tr_desc)(void);
102 void (*load_gdt)(const struct Xgt_desc_struct *);
103 void (*load_idt)(const struct Xgt_desc_struct *);
104 void (*store_gdt)(struct Xgt_desc_struct *);
105 void (*store_idt)(struct Xgt_desc_struct *);
106 void (*set_ldt)(const void *desc, unsigned entries);
107 unsigned long (*store_tr)(void);
108 void (*load_tls)(struct thread_struct *t, unsigned int cpu);
109 void (*write_ldt_entry)(struct desc_struct *,
110 int entrynum, u32 low, u32 high);
111 void (*write_gdt_entry)(struct desc_struct *,
112 int entrynum, u32 low, u32 high);
113 void (*write_idt_entry)(struct desc_struct *,
114 int entrynum, u32 low, u32 high);
115 void (*load_esp0)(struct tss_struct *tss, struct thread_struct *t);
117 void (*set_iopl_mask)(unsigned mask);
119 void (*io_delay)(void);
121 #ifdef CONFIG_X86_LOCAL_APIC
122 void (*apic_write)(unsigned long reg, unsigned long v);
123 void (*apic_write_atomic)(unsigned long reg, unsigned long v);
124 unsigned long (*apic_read)(unsigned long reg);
125 void (*setup_boot_clock)(void);
126 void (*setup_secondary_clock)(void);
129 void (*flush_tlb_user)(void);
130 void (*flush_tlb_kernel)(void);
131 void (*flush_tlb_single)(u32 addr);
133 void (*map_pt_hook)(int type, pte_t *va, u32 pfn);
135 void (*alloc_pt)(u32 pfn);
136 void (*alloc_pd)(u32 pfn);
137 void (*alloc_pd_clone)(u32 pfn, u32 clonepfn, u32 start, u32 count);
138 void (*release_pt)(u32 pfn);
139 void (*release_pd)(u32 pfn);
141 void (*set_pte)(pte_t *ptep, pte_t pteval);
142 void (*set_pte_at)(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pteval);
143 void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
144 void (*pte_update)(struct mm_struct *mm, u32 addr, pte_t *ptep);
145 void (*pte_update_defer)(struct mm_struct *mm, u32 addr, pte_t *ptep);
146 #ifdef CONFIG_X86_PAE
147 void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
148 void (*set_pte_present)(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte);
149 void (*set_pud)(pud_t *pudp, pud_t pudval);
150 void (*pte_clear)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
151 void (*pmd_clear)(pmd_t *pmdp);
154 void (*set_lazy_mode)(int mode);
156 /* These two are jmp to, not actually called. */
157 void (*irq_enable_sysexit)(void);
160 void (*startup_ipi_hook)(int phys_apicid, unsigned long start_eip, unsigned long start_esp);
163 /* Mark a paravirt probe function. */
164 #define paravirt_probe(fn) \
165 static asmlinkage void (*__paravirtprobe_##fn)(void) __attribute_used__ \
166 __attribute__((__section__(".paravirtprobe"))) = fn
168 extern struct paravirt_ops paravirt_ops;
170 #define paravirt_enabled() (paravirt_ops.paravirt_enabled)
172 static inline void load_esp0(struct tss_struct *tss,
173 struct thread_struct *thread)
175 paravirt_ops.load_esp0(tss, thread);
178 #define ARCH_SETUP paravirt_ops.arch_setup();
179 static inline unsigned long get_wallclock(void)
181 return paravirt_ops.get_wallclock();
184 static inline int set_wallclock(unsigned long nowtime)
186 return paravirt_ops.set_wallclock(nowtime);
189 static inline void (*choose_time_init(void))(void)
191 return paravirt_ops.time_init;
194 /* The paravirtualized CPUID instruction. */
195 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
196 unsigned int *ecx, unsigned int *edx)
198 paravirt_ops.cpuid(eax, ebx, ecx, edx);
202 * These special macros can be used to get or set a debugging register
204 #define get_debugreg(var, reg) var = paravirt_ops.get_debugreg(reg)
205 #define set_debugreg(val, reg) paravirt_ops.set_debugreg(reg, val)
207 #define clts() paravirt_ops.clts()
209 #define read_cr0() paravirt_ops.read_cr0()
210 #define write_cr0(x) paravirt_ops.write_cr0(x)
212 #define read_cr2() paravirt_ops.read_cr2()
213 #define write_cr2(x) paravirt_ops.write_cr2(x)
215 #define read_cr3() paravirt_ops.read_cr3()
216 #define write_cr3(x) paravirt_ops.write_cr3(x)
218 #define read_cr4() paravirt_ops.read_cr4()
219 #define read_cr4_safe(x) paravirt_ops.read_cr4_safe()
220 #define write_cr4(x) paravirt_ops.write_cr4(x)
222 static inline void raw_safe_halt(void)
224 paravirt_ops.safe_halt();
227 static inline void halt(void)
229 paravirt_ops.safe_halt();
231 #define wbinvd() paravirt_ops.wbinvd()
233 #define get_kernel_rpl() (paravirt_ops.kernel_rpl)
235 /* These should all do BUG_ON(_err), but our headers are too tangled. */
236 #define rdmsr(msr,val1,val2) do { \
238 u64 _l = paravirt_ops.read_msr(msr,&_err); \
243 #define wrmsr(msr,val1,val2) do { \
244 u64 _l = ((u64)(val2) << 32) | (val1); \
245 paravirt_ops.write_msr((msr), _l); \
248 #define rdmsrl(msr,val) do { \
250 val = paravirt_ops.read_msr((msr),&_err); \
253 #define wrmsrl(msr,val) (paravirt_ops.write_msr((msr),(val)))
254 #define wrmsr_safe(msr,a,b) ({ \
255 u64 _l = ((u64)(b) << 32) | (a); \
256 paravirt_ops.write_msr((msr),_l); \
259 /* rdmsr with exception handling */
260 #define rdmsr_safe(msr,a,b) ({ \
262 u64 _l = paravirt_ops.read_msr(msr,&_err); \
267 #define rdtsc(low,high) do { \
268 u64 _l = paravirt_ops.read_tsc(); \
273 #define rdtscl(low) do { \
274 u64 _l = paravirt_ops.read_tsc(); \
278 #define rdtscll(val) (val = paravirt_ops.read_tsc())
280 #define get_scheduled_cycles(val) (val = paravirt_ops.get_scheduled_cycles())
281 #define calculate_cpu_khz() (paravirt_ops.get_cpu_khz())
283 #define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
285 #define rdpmc(counter,low,high) do { \
286 u64 _l = paravirt_ops.read_pmc(); \
291 #define load_TR_desc() (paravirt_ops.load_tr_desc())
292 #define load_gdt(dtr) (paravirt_ops.load_gdt(dtr))
293 #define load_idt(dtr) (paravirt_ops.load_idt(dtr))
294 #define set_ldt(addr, entries) (paravirt_ops.set_ldt((addr), (entries)))
295 #define store_gdt(dtr) (paravirt_ops.store_gdt(dtr))
296 #define store_idt(dtr) (paravirt_ops.store_idt(dtr))
297 #define store_tr(tr) ((tr) = paravirt_ops.store_tr())
298 #define load_TLS(t,cpu) (paravirt_ops.load_tls((t),(cpu)))
299 #define write_ldt_entry(dt, entry, low, high) \
300 (paravirt_ops.write_ldt_entry((dt), (entry), (low), (high)))
301 #define write_gdt_entry(dt, entry, low, high) \
302 (paravirt_ops.write_gdt_entry((dt), (entry), (low), (high)))
303 #define write_idt_entry(dt, entry, low, high) \
304 (paravirt_ops.write_idt_entry((dt), (entry), (low), (high)))
305 #define set_iopl_mask(mask) (paravirt_ops.set_iopl_mask(mask))
307 /* The paravirtualized I/O functions */
308 static inline void slow_down_io(void) {
309 paravirt_ops.io_delay();
310 #ifdef REALLY_SLOW_IO
311 paravirt_ops.io_delay();
312 paravirt_ops.io_delay();
313 paravirt_ops.io_delay();
317 #ifdef CONFIG_X86_LOCAL_APIC
319 * Basic functions accessing APICs.
321 static inline void apic_write(unsigned long reg, unsigned long v)
323 paravirt_ops.apic_write(reg,v);
326 static inline void apic_write_atomic(unsigned long reg, unsigned long v)
328 paravirt_ops.apic_write_atomic(reg,v);
331 static inline unsigned long apic_read(unsigned long reg)
333 return paravirt_ops.apic_read(reg);
336 static inline void setup_boot_clock(void)
338 paravirt_ops.setup_boot_clock();
341 static inline void setup_secondary_clock(void)
343 paravirt_ops.setup_secondary_clock();
348 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
349 unsigned long start_esp)
351 return paravirt_ops.startup_ipi_hook(phys_apicid, start_eip, start_esp);
355 #define __flush_tlb() paravirt_ops.flush_tlb_user()
356 #define __flush_tlb_global() paravirt_ops.flush_tlb_kernel()
357 #define __flush_tlb_single(addr) paravirt_ops.flush_tlb_single(addr)
359 #define paravirt_map_pt_hook(type, va, pfn) paravirt_ops.map_pt_hook(type, va, pfn)
361 #define paravirt_alloc_pt(pfn) paravirt_ops.alloc_pt(pfn)
362 #define paravirt_release_pt(pfn) paravirt_ops.release_pt(pfn)
364 #define paravirt_alloc_pd(pfn) paravirt_ops.alloc_pd(pfn)
365 #define paravirt_alloc_pd_clone(pfn, clonepfn, start, count) \
366 paravirt_ops.alloc_pd_clone(pfn, clonepfn, start, count)
367 #define paravirt_release_pd(pfn) paravirt_ops.release_pd(pfn)
369 static inline void set_pte(pte_t *ptep, pte_t pteval)
371 paravirt_ops.set_pte(ptep, pteval);
374 static inline void set_pte_at(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pteval)
376 paravirt_ops.set_pte_at(mm, addr, ptep, pteval);
379 static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
381 paravirt_ops.set_pmd(pmdp, pmdval);
384 static inline void pte_update(struct mm_struct *mm, u32 addr, pte_t *ptep)
386 paravirt_ops.pte_update(mm, addr, ptep);
389 static inline void pte_update_defer(struct mm_struct *mm, u32 addr, pte_t *ptep)
391 paravirt_ops.pte_update_defer(mm, addr, ptep);
394 #ifdef CONFIG_X86_PAE
395 static inline void set_pte_atomic(pte_t *ptep, pte_t pteval)
397 paravirt_ops.set_pte_atomic(ptep, pteval);
400 static inline void set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
402 paravirt_ops.set_pte_present(mm, addr, ptep, pte);
405 static inline void set_pud(pud_t *pudp, pud_t pudval)
407 paravirt_ops.set_pud(pudp, pudval);
410 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
412 paravirt_ops.pte_clear(mm, addr, ptep);
415 static inline void pmd_clear(pmd_t *pmdp)
417 paravirt_ops.pmd_clear(pmdp);
421 /* Lazy mode for batching updates / context switch */
422 #define PARAVIRT_LAZY_NONE 0
423 #define PARAVIRT_LAZY_MMU 1
424 #define PARAVIRT_LAZY_CPU 2
425 #define PARAVIRT_LAZY_FLUSH 3
427 #define __HAVE_ARCH_ENTER_LAZY_CPU_MODE
428 #define arch_enter_lazy_cpu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_CPU)
429 #define arch_leave_lazy_cpu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_NONE)
430 #define arch_flush_lazy_cpu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_FLUSH)
432 #define __HAVE_ARCH_ENTER_LAZY_MMU_MODE
433 #define arch_enter_lazy_mmu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_MMU)
434 #define arch_leave_lazy_mmu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_NONE)
435 #define arch_flush_lazy_mmu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_FLUSH)
437 /* These all sit in the .parainstructions section to tell us what to patch. */
438 struct paravirt_patch {
439 u8 *instr; /* original instructions */
440 u8 instrtype; /* type of this instruction */
441 u8 len; /* length of original instruction */
442 u16 clobbers; /* what registers you may clobber */
445 #define paravirt_alt(insn_string, typenum, clobber) \
446 "771:\n\t" insn_string "\n" "772:\n" \
447 ".pushsection .parainstructions,\"a\"\n" \
449 " .byte " __stringify(typenum) "\n" \
450 " .byte 772b-771b\n" \
451 " .short " __stringify(clobber) "\n" \
454 static inline unsigned long __raw_local_save_flags(void)
458 __asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
460 "popl %%edx; popl %%ecx",
461 PARAVIRT_SAVE_FLAGS, CLBR_NONE)
462 : "=a"(f): "m"(paravirt_ops.save_fl)
467 static inline void raw_local_irq_restore(unsigned long f)
469 __asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
471 "popl %%edx; popl %%ecx",
472 PARAVIRT_RESTORE_FLAGS, CLBR_EAX)
473 : "=a"(f) : "m" (paravirt_ops.restore_fl), "0"(f)
477 static inline void raw_local_irq_disable(void)
479 __asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
481 "popl %%edx; popl %%ecx",
482 PARAVIRT_IRQ_DISABLE, CLBR_EAX)
483 : : "m" (paravirt_ops.irq_disable)
484 : "memory", "eax", "cc");
487 static inline void raw_local_irq_enable(void)
489 __asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
491 "popl %%edx; popl %%ecx",
492 PARAVIRT_IRQ_ENABLE, CLBR_EAX)
493 : : "m" (paravirt_ops.irq_enable)
494 : "memory", "eax", "cc");
497 static inline unsigned long __raw_local_irq_save(void)
501 __asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
502 "call *%1; pushl %%eax;"
503 "call *%2; popl %%eax;"
504 "popl %%edx; popl %%ecx",
505 PARAVIRT_SAVE_FLAGS_IRQ_DISABLE,
508 : "m" (paravirt_ops.save_fl),
509 "m" (paravirt_ops.irq_disable)
514 #define CLI_STRING paravirt_alt("pushl %%ecx; pushl %%edx;" \
515 "call *paravirt_ops+%c[irq_disable];" \
516 "popl %%edx; popl %%ecx", \
517 PARAVIRT_IRQ_DISABLE, CLBR_EAX)
519 #define STI_STRING paravirt_alt("pushl %%ecx; pushl %%edx;" \
520 "call *paravirt_ops+%c[irq_enable];" \
521 "popl %%edx; popl %%ecx", \
522 PARAVIRT_IRQ_ENABLE, CLBR_EAX)
523 #define CLI_STI_CLOBBERS , "%eax"
524 #define CLI_STI_INPUT_ARGS \
526 [irq_disable] "i" (offsetof(struct paravirt_ops, irq_disable)), \
527 [irq_enable] "i" (offsetof(struct paravirt_ops, irq_enable))
529 #else /* __ASSEMBLY__ */
531 #define PARA_PATCH(ptype, clobbers, ops) \
535 .pushsection .parainstructions,"a"; \
542 #define INTERRUPT_RETURN \
543 PARA_PATCH(PARAVIRT_INTERRUPT_RETURN, CLBR_ANY, \
544 jmp *%cs:paravirt_ops+PARAVIRT_iret)
546 #define DISABLE_INTERRUPTS(clobbers) \
547 PARA_PATCH(PARAVIRT_IRQ_DISABLE, clobbers, \
548 pushl %ecx; pushl %edx; \
549 call *paravirt_ops+PARAVIRT_irq_disable; \
550 popl %edx; popl %ecx) \
552 #define ENABLE_INTERRUPTS(clobbers) \
553 PARA_PATCH(PARAVIRT_IRQ_ENABLE, clobbers, \
554 pushl %ecx; pushl %edx; \
555 call *%cs:paravirt_ops+PARAVIRT_irq_enable; \
556 popl %edx; popl %ecx)
558 #define ENABLE_INTERRUPTS_SYSEXIT \
559 PARA_PATCH(PARAVIRT_STI_SYSEXIT, CLBR_ANY, \
560 jmp *%cs:paravirt_ops+PARAVIRT_irq_enable_sysexit)
562 #define GET_CR0_INTO_EAX \
563 call *paravirt_ops+PARAVIRT_read_cr0
565 #endif /* __ASSEMBLY__ */
566 #endif /* CONFIG_PARAVIRT */
567 #endif /* __ASM_PARAVIRT_H */