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. */
9 /* Bitmask of what can be clobbered: usually at least eax. */
17 #include <linux/types.h>
20 struct Xgt_desc_struct;
26 unsigned int kernel_rpl;
27 int shared_kernel_pmd;
32 * Patch may replace one of the defined code sequences with arbitrary
33 * code, subject to the same register constraints. This generally
34 * means the code is not free to clobber any registers other than EAX.
35 * The patch function should return the number of bytes of code
36 * generated, as we nop pad the rest in generic code.
38 unsigned (*patch)(u8 type, u16 clobber, void *firstinsn, unsigned len);
40 void (*arch_setup)(void);
41 char *(*memory_setup)(void);
42 void (*init_IRQ)(void);
44 void (*pagetable_setup_start)(pgd_t *pgd_base);
45 void (*pagetable_setup_done)(pgd_t *pgd_base);
49 unsigned long (*get_wallclock)(void);
50 int (*set_wallclock)(unsigned long);
51 void (*time_init)(void);
53 void (*cpuid)(unsigned int *eax, unsigned int *ebx,
54 unsigned int *ecx, unsigned int *edx);
56 unsigned long (*get_debugreg)(int regno);
57 void (*set_debugreg)(int regno, unsigned long value);
61 unsigned long (*read_cr0)(void);
62 void (*write_cr0)(unsigned long);
64 unsigned long (*read_cr2)(void);
65 void (*write_cr2)(unsigned long);
67 unsigned long (*read_cr3)(void);
68 void (*write_cr3)(unsigned long);
70 unsigned long (*read_cr4_safe)(void);
71 unsigned long (*read_cr4)(void);
72 void (*write_cr4)(unsigned long);
74 unsigned long (*save_fl)(void);
75 void (*restore_fl)(unsigned long);
76 void (*irq_disable)(void);
77 void (*irq_enable)(void);
78 void (*safe_halt)(void);
82 /* err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
83 u64 (*read_msr)(unsigned int msr, int *err);
84 int (*write_msr)(unsigned int msr, u64 val);
86 u64 (*read_tsc)(void);
87 u64 (*read_pmc)(void);
88 u64 (*get_scheduled_cycles)(void);
89 unsigned long (*get_cpu_khz)(void);
91 void (*load_tr_desc)(void);
92 void (*load_gdt)(const struct Xgt_desc_struct *);
93 void (*load_idt)(const struct Xgt_desc_struct *);
94 void (*store_gdt)(struct Xgt_desc_struct *);
95 void (*store_idt)(struct Xgt_desc_struct *);
96 void (*set_ldt)(const void *desc, unsigned entries);
97 unsigned long (*store_tr)(void);
98 void (*load_tls)(struct thread_struct *t, unsigned int cpu);
99 void (*write_ldt_entry)(struct desc_struct *,
100 int entrynum, u32 low, u32 high);
101 void (*write_gdt_entry)(struct desc_struct *,
102 int entrynum, u32 low, u32 high);
103 void (*write_idt_entry)(struct desc_struct *,
104 int entrynum, u32 low, u32 high);
105 void (*load_esp0)(struct tss_struct *tss, struct thread_struct *t);
107 void (*set_iopl_mask)(unsigned mask);
109 void (*io_delay)(void);
111 void (*activate_mm)(struct mm_struct *prev,
112 struct mm_struct *next);
113 void (*dup_mmap)(struct mm_struct *oldmm,
114 struct mm_struct *mm);
115 void (*exit_mmap)(struct mm_struct *mm);
117 #ifdef CONFIG_X86_LOCAL_APIC
118 void (*apic_write)(unsigned long reg, unsigned long v);
119 void (*apic_write_atomic)(unsigned long reg, unsigned long v);
120 unsigned long (*apic_read)(unsigned long reg);
121 void (*setup_boot_clock)(void);
122 void (*setup_secondary_clock)(void);
125 void (*flush_tlb_user)(void);
126 void (*flush_tlb_kernel)(void);
127 void (*flush_tlb_single)(u32 addr);
129 void (*map_pt_hook)(int type, pte_t *va, u32 pfn);
131 void (*alloc_pt)(u32 pfn);
132 void (*alloc_pd)(u32 pfn);
133 void (*alloc_pd_clone)(u32 pfn, u32 clonepfn, u32 start, u32 count);
134 void (*release_pt)(u32 pfn);
135 void (*release_pd)(u32 pfn);
137 void (*set_pte)(pte_t *ptep, pte_t pteval);
138 void (*set_pte_at)(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pteval);
139 void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
140 void (*pte_update)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
141 void (*pte_update_defer)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
143 pte_t (*ptep_get_and_clear)(pte_t *ptep);
145 #ifdef CONFIG_X86_PAE
146 void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
147 void (*set_pte_present)(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte);
148 void (*set_pud)(pud_t *pudp, pud_t pudval);
149 void (*pte_clear)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
150 void (*pmd_clear)(pmd_t *pmdp);
152 unsigned long long (*pte_val)(pte_t);
153 unsigned long long (*pmd_val)(pmd_t);
154 unsigned long long (*pgd_val)(pgd_t);
156 pte_t (*make_pte)(unsigned long long pte);
157 pmd_t (*make_pmd)(unsigned long long pmd);
158 pgd_t (*make_pgd)(unsigned long long pgd);
160 unsigned long (*pte_val)(pte_t);
161 unsigned long (*pgd_val)(pgd_t);
163 pte_t (*make_pte)(unsigned long pte);
164 pgd_t (*make_pgd)(unsigned long pgd);
167 void (*set_lazy_mode)(int mode);
169 /* These two are jmp to, not actually called. */
170 void (*irq_enable_sysexit)(void);
173 void (*startup_ipi_hook)(int phys_apicid, unsigned long start_eip, unsigned long start_esp);
176 /* Mark a paravirt probe function. */
177 #define paravirt_probe(fn) \
178 static asmlinkage void (*__paravirtprobe_##fn)(void) __attribute_used__ \
179 __attribute__((__section__(".paravirtprobe"))) = fn
181 extern struct paravirt_ops paravirt_ops;
183 #define PARAVIRT_PATCH(x) \
184 (offsetof(struct paravirt_ops, x) / sizeof(void *))
186 #define paravirt_type(type) \
187 [paravirt_typenum] "i" (PARAVIRT_PATCH(type))
188 #define paravirt_clobber(clobber) \
189 [paravirt_clobber] "i" (clobber)
191 #define PARAVIRT_CALL "call *paravirt_ops+%c[paravirt_typenum]*4;"
193 #define _paravirt_alt(insn_string, type, clobber) \
194 "771:\n\t" insn_string "\n" "772:\n" \
195 ".pushsection .parainstructions,\"a\"\n" \
197 " .byte " type "\n" \
198 " .byte 772b-771b\n" \
199 " .short " clobber "\n" \
202 #define paravirt_alt(insn_string) \
203 _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
205 #define paravirt_enabled() (paravirt_ops.paravirt_enabled)
207 static inline void load_esp0(struct tss_struct *tss,
208 struct thread_struct *thread)
210 paravirt_ops.load_esp0(tss, thread);
213 #define ARCH_SETUP paravirt_ops.arch_setup();
214 static inline unsigned long get_wallclock(void)
216 return paravirt_ops.get_wallclock();
219 static inline int set_wallclock(unsigned long nowtime)
221 return paravirt_ops.set_wallclock(nowtime);
224 static inline void (*choose_time_init(void))(void)
226 return paravirt_ops.time_init;
229 /* The paravirtualized CPUID instruction. */
230 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
231 unsigned int *ecx, unsigned int *edx)
233 paravirt_ops.cpuid(eax, ebx, ecx, edx);
237 * These special macros can be used to get or set a debugging register
239 #define get_debugreg(var, reg) var = paravirt_ops.get_debugreg(reg)
240 #define set_debugreg(val, reg) paravirt_ops.set_debugreg(reg, val)
242 #define clts() paravirt_ops.clts()
244 #define read_cr0() paravirt_ops.read_cr0()
245 #define write_cr0(x) paravirt_ops.write_cr0(x)
247 #define read_cr2() paravirt_ops.read_cr2()
248 #define write_cr2(x) paravirt_ops.write_cr2(x)
250 #define read_cr3() paravirt_ops.read_cr3()
251 #define write_cr3(x) paravirt_ops.write_cr3(x)
253 #define read_cr4() paravirt_ops.read_cr4()
254 #define read_cr4_safe(x) paravirt_ops.read_cr4_safe()
255 #define write_cr4(x) paravirt_ops.write_cr4(x)
257 #define raw_ptep_get_and_clear(xp) (paravirt_ops.ptep_get_and_clear(xp))
259 static inline void raw_safe_halt(void)
261 paravirt_ops.safe_halt();
264 static inline void halt(void)
266 paravirt_ops.safe_halt();
268 #define wbinvd() paravirt_ops.wbinvd()
270 #define get_kernel_rpl() (paravirt_ops.kernel_rpl)
272 /* These should all do BUG_ON(_err), but our headers are too tangled. */
273 #define rdmsr(msr,val1,val2) do { \
275 u64 _l = paravirt_ops.read_msr(msr,&_err); \
280 #define wrmsr(msr,val1,val2) do { \
281 u64 _l = ((u64)(val2) << 32) | (val1); \
282 paravirt_ops.write_msr((msr), _l); \
285 #define rdmsrl(msr,val) do { \
287 val = paravirt_ops.read_msr((msr),&_err); \
290 #define wrmsrl(msr,val) (paravirt_ops.write_msr((msr),(val)))
291 #define wrmsr_safe(msr,a,b) ({ \
292 u64 _l = ((u64)(b) << 32) | (a); \
293 paravirt_ops.write_msr((msr),_l); \
296 /* rdmsr with exception handling */
297 #define rdmsr_safe(msr,a,b) ({ \
299 u64 _l = paravirt_ops.read_msr(msr,&_err); \
304 #define rdtsc(low,high) do { \
305 u64 _l = paravirt_ops.read_tsc(); \
310 #define rdtscl(low) do { \
311 u64 _l = paravirt_ops.read_tsc(); \
315 #define rdtscll(val) (val = paravirt_ops.read_tsc())
317 #define get_scheduled_cycles(val) (val = paravirt_ops.get_scheduled_cycles())
318 #define calculate_cpu_khz() (paravirt_ops.get_cpu_khz())
320 #define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
322 #define rdpmc(counter,low,high) do { \
323 u64 _l = paravirt_ops.read_pmc(); \
328 #define load_TR_desc() (paravirt_ops.load_tr_desc())
329 #define load_gdt(dtr) (paravirt_ops.load_gdt(dtr))
330 #define load_idt(dtr) (paravirt_ops.load_idt(dtr))
331 #define set_ldt(addr, entries) (paravirt_ops.set_ldt((addr), (entries)))
332 #define store_gdt(dtr) (paravirt_ops.store_gdt(dtr))
333 #define store_idt(dtr) (paravirt_ops.store_idt(dtr))
334 #define store_tr(tr) ((tr) = paravirt_ops.store_tr())
335 #define load_TLS(t,cpu) (paravirt_ops.load_tls((t),(cpu)))
336 #define write_ldt_entry(dt, entry, low, high) \
337 (paravirt_ops.write_ldt_entry((dt), (entry), (low), (high)))
338 #define write_gdt_entry(dt, entry, low, high) \
339 (paravirt_ops.write_gdt_entry((dt), (entry), (low), (high)))
340 #define write_idt_entry(dt, entry, low, high) \
341 (paravirt_ops.write_idt_entry((dt), (entry), (low), (high)))
342 #define set_iopl_mask(mask) (paravirt_ops.set_iopl_mask(mask))
344 #define __pte(x) paravirt_ops.make_pte(x)
345 #define __pgd(x) paravirt_ops.make_pgd(x)
347 #define pte_val(x) paravirt_ops.pte_val(x)
348 #define pgd_val(x) paravirt_ops.pgd_val(x)
350 #ifdef CONFIG_X86_PAE
351 #define __pmd(x) paravirt_ops.make_pmd(x)
352 #define pmd_val(x) paravirt_ops.pmd_val(x)
355 /* The paravirtualized I/O functions */
356 static inline void slow_down_io(void) {
357 paravirt_ops.io_delay();
358 #ifdef REALLY_SLOW_IO
359 paravirt_ops.io_delay();
360 paravirt_ops.io_delay();
361 paravirt_ops.io_delay();
365 #ifdef CONFIG_X86_LOCAL_APIC
367 * Basic functions accessing APICs.
369 static inline void apic_write(unsigned long reg, unsigned long v)
371 paravirt_ops.apic_write(reg,v);
374 static inline void apic_write_atomic(unsigned long reg, unsigned long v)
376 paravirt_ops.apic_write_atomic(reg,v);
379 static inline unsigned long apic_read(unsigned long reg)
381 return paravirt_ops.apic_read(reg);
384 static inline void setup_boot_clock(void)
386 paravirt_ops.setup_boot_clock();
389 static inline void setup_secondary_clock(void)
391 paravirt_ops.setup_secondary_clock();
395 static inline void paravirt_pagetable_setup_start(pgd_t *base)
397 if (paravirt_ops.pagetable_setup_start)
398 (*paravirt_ops.pagetable_setup_start)(base);
401 static inline void paravirt_pagetable_setup_done(pgd_t *base)
403 if (paravirt_ops.pagetable_setup_done)
404 (*paravirt_ops.pagetable_setup_done)(base);
408 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
409 unsigned long start_esp)
411 return paravirt_ops.startup_ipi_hook(phys_apicid, start_eip, start_esp);
415 static inline void paravirt_activate_mm(struct mm_struct *prev,
416 struct mm_struct *next)
418 paravirt_ops.activate_mm(prev, next);
421 static inline void arch_dup_mmap(struct mm_struct *oldmm,
422 struct mm_struct *mm)
424 paravirt_ops.dup_mmap(oldmm, mm);
427 static inline void arch_exit_mmap(struct mm_struct *mm)
429 paravirt_ops.exit_mmap(mm);
432 #define __flush_tlb() paravirt_ops.flush_tlb_user()
433 #define __flush_tlb_global() paravirt_ops.flush_tlb_kernel()
434 #define __flush_tlb_single(addr) paravirt_ops.flush_tlb_single(addr)
436 #define paravirt_map_pt_hook(type, va, pfn) paravirt_ops.map_pt_hook(type, va, pfn)
438 #define paravirt_alloc_pt(pfn) paravirt_ops.alloc_pt(pfn)
439 #define paravirt_release_pt(pfn) paravirt_ops.release_pt(pfn)
441 #define paravirt_alloc_pd(pfn) paravirt_ops.alloc_pd(pfn)
442 #define paravirt_alloc_pd_clone(pfn, clonepfn, start, count) \
443 paravirt_ops.alloc_pd_clone(pfn, clonepfn, start, count)
444 #define paravirt_release_pd(pfn) paravirt_ops.release_pd(pfn)
446 static inline void set_pte(pte_t *ptep, pte_t pteval)
448 paravirt_ops.set_pte(ptep, pteval);
451 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
452 pte_t *ptep, pte_t pteval)
454 paravirt_ops.set_pte_at(mm, addr, ptep, pteval);
457 static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
459 paravirt_ops.set_pmd(pmdp, pmdval);
462 static inline void pte_update(struct mm_struct *mm, u32 addr, pte_t *ptep)
464 paravirt_ops.pte_update(mm, addr, ptep);
467 static inline void pte_update_defer(struct mm_struct *mm, u32 addr, pte_t *ptep)
469 paravirt_ops.pte_update_defer(mm, addr, ptep);
472 #ifdef CONFIG_X86_PAE
473 static inline void set_pte_atomic(pte_t *ptep, pte_t pteval)
475 paravirt_ops.set_pte_atomic(ptep, pteval);
478 static inline void set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
480 paravirt_ops.set_pte_present(mm, addr, ptep, pte);
483 static inline void set_pud(pud_t *pudp, pud_t pudval)
485 paravirt_ops.set_pud(pudp, pudval);
488 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
490 paravirt_ops.pte_clear(mm, addr, ptep);
493 static inline void pmd_clear(pmd_t *pmdp)
495 paravirt_ops.pmd_clear(pmdp);
499 /* Lazy mode for batching updates / context switch */
500 #define PARAVIRT_LAZY_NONE 0
501 #define PARAVIRT_LAZY_MMU 1
502 #define PARAVIRT_LAZY_CPU 2
503 #define PARAVIRT_LAZY_FLUSH 3
505 #define __HAVE_ARCH_ENTER_LAZY_CPU_MODE
506 #define arch_enter_lazy_cpu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_CPU)
507 #define arch_leave_lazy_cpu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_NONE)
508 #define arch_flush_lazy_cpu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_FLUSH)
510 #define __HAVE_ARCH_ENTER_LAZY_MMU_MODE
511 #define arch_enter_lazy_mmu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_MMU)
512 #define arch_leave_lazy_mmu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_NONE)
513 #define arch_flush_lazy_mmu_mode() paravirt_ops.set_lazy_mode(PARAVIRT_LAZY_FLUSH)
515 void _paravirt_nop(void);
516 #define paravirt_nop ((void *)_paravirt_nop)
518 /* These all sit in the .parainstructions section to tell us what to patch. */
519 struct paravirt_patch_site {
520 u8 *instr; /* original instructions */
521 u8 instrtype; /* type of this instruction */
522 u8 len; /* length of original instruction */
523 u16 clobbers; /* what registers you may clobber */
526 extern struct paravirt_patch_site __parainstructions[],
527 __parainstructions_end[];
529 static inline unsigned long __raw_local_save_flags(void)
533 asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
535 "popl %%edx; popl %%ecx")
537 : paravirt_type(save_fl),
538 paravirt_clobber(CLBR_EAX)
543 static inline void raw_local_irq_restore(unsigned long f)
545 asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
547 "popl %%edx; popl %%ecx")
550 paravirt_type(restore_fl),
551 paravirt_clobber(CLBR_EAX)
555 static inline void raw_local_irq_disable(void)
557 asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
559 "popl %%edx; popl %%ecx")
561 : paravirt_type(irq_disable),
562 paravirt_clobber(CLBR_EAX)
563 : "memory", "eax", "cc");
566 static inline void raw_local_irq_enable(void)
568 asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
570 "popl %%edx; popl %%ecx")
572 : paravirt_type(irq_enable),
573 paravirt_clobber(CLBR_EAX)
574 : "memory", "eax", "cc");
577 static inline unsigned long __raw_local_irq_save(void)
581 f = __raw_local_save_flags();
582 raw_local_irq_disable();
587 _paravirt_alt("pushl %%ecx; pushl %%edx;" \
588 "call *paravirt_ops+%c[paravirt_cli_type]*4;" \
589 "popl %%edx; popl %%ecx", \
590 "%c[paravirt_cli_type]", "%c[paravirt_clobber]")
593 _paravirt_alt("pushl %%ecx; pushl %%edx;" \
594 "call *paravirt_ops+%c[paravirt_sti_type]*4;" \
595 "popl %%edx; popl %%ecx", \
596 "%c[paravirt_sti_type]", "%c[paravirt_clobber]")
598 #define CLI_STI_CLOBBERS , "%eax"
599 #define CLI_STI_INPUT_ARGS \
601 [paravirt_cli_type] "i" (PARAVIRT_PATCH(irq_disable)), \
602 [paravirt_sti_type] "i" (PARAVIRT_PATCH(irq_enable)), \
603 paravirt_clobber(CLBR_EAX)
607 #else /* __ASSEMBLY__ */
609 #define PARA_PATCH(off) ((off) / 4)
611 #define PARA_SITE(ptype, clobbers, ops) \
615 .pushsection .parainstructions,"a"; \
622 #define INTERRUPT_RETURN \
623 PARA_SITE(PARA_PATCH(PARAVIRT_iret), CLBR_NONE, \
624 jmp *%cs:paravirt_ops+PARAVIRT_iret)
626 #define DISABLE_INTERRUPTS(clobbers) \
627 PARA_SITE(PARA_PATCH(PARAVIRT_irq_disable), clobbers, \
628 pushl %eax; pushl %ecx; pushl %edx; \
629 call *%cs:paravirt_ops+PARAVIRT_irq_disable; \
630 popl %edx; popl %ecx; popl %eax) \
632 #define ENABLE_INTERRUPTS(clobbers) \
633 PARA_SITE(PARA_PATCH(PARAVIRT_irq_enable), clobbers, \
634 pushl %eax; pushl %ecx; pushl %edx; \
635 call *%cs:paravirt_ops+PARAVIRT_irq_enable; \
636 popl %edx; popl %ecx; popl %eax)
638 #define ENABLE_INTERRUPTS_SYSEXIT \
639 PARA_SITE(PARA_PATCH(PARAVIRT_irq_enable_sysexit), CLBR_NONE, \
640 jmp *%cs:paravirt_ops+PARAVIRT_irq_enable_sysexit)
642 #define GET_CR0_INTO_EAX \
643 push %ecx; push %edx; \
644 call *paravirt_ops+PARAVIRT_read_cr0; \
647 #endif /* __ASSEMBLY__ */
648 #endif /* CONFIG_PARAVIRT */
649 #endif /* __ASM_PARAVIRT_H */