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. */
10 /* Bitmask of what can be clobbered: usually at least eax. */
12 #define CLBR_EAX (1 << 0)
13 #define CLBR_ECX (1 << 1)
14 #define CLBR_EDX (1 << 2)
17 #define CLBR_RSI (1 << 3)
18 #define CLBR_RDI (1 << 4)
19 #define CLBR_R8 (1 << 5)
20 #define CLBR_R9 (1 << 6)
21 #define CLBR_R10 (1 << 7)
22 #define CLBR_R11 (1 << 8)
23 #define CLBR_ANY ((1 << 9) - 1)
24 #include <asm/desc_defs.h>
26 /* CLBR_ANY should match all regs platform has. For i386, that's just it */
27 #define CLBR_ANY ((1 << 3) - 1)
31 #include <linux/types.h>
32 #include <linux/cpumask.h>
33 #include <asm/kmap_types.h>
34 #include <asm/desc_defs.h>
45 unsigned int kernel_rpl;
46 int shared_kernel_pmd;
53 * Patch may replace one of the defined code sequences with
54 * arbitrary code, subject to the same register constraints.
55 * This generally means the code is not free to clobber any
56 * registers other than EAX. The patch function should return
57 * the number of bytes of code generated, as we nop pad the
58 * rest in generic code.
60 unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
61 unsigned long addr, unsigned len);
63 /* Basic arch-specific setup */
64 void (*arch_setup)(void);
65 char *(*memory_setup)(void);
66 void (*post_allocator_init)(void);
68 /* Print a banner to identify the environment */
74 /* Set deferred update mode, used for batching operations. */
80 void (*time_init)(void);
82 /* Set and set time of day */
83 unsigned long (*get_wallclock)(void);
84 int (*set_wallclock)(unsigned long);
86 unsigned long long (*sched_clock)(void);
87 unsigned long (*get_cpu_khz)(void);
91 /* hooks for various privileged instructions */
92 unsigned long (*get_debugreg)(int regno);
93 void (*set_debugreg)(int regno, unsigned long value);
97 unsigned long (*read_cr0)(void);
98 void (*write_cr0)(unsigned long);
100 unsigned long (*read_cr4_safe)(void);
101 unsigned long (*read_cr4)(void);
102 void (*write_cr4)(unsigned long);
105 unsigned long (*read_cr8)(void);
106 void (*write_cr8)(unsigned long);
109 /* Segment descriptor handling */
110 void (*load_tr_desc)(void);
111 void (*load_gdt)(const struct desc_ptr *);
112 void (*load_idt)(const struct desc_ptr *);
113 void (*store_gdt)(struct desc_ptr *);
114 void (*store_idt)(struct desc_ptr *);
115 void (*set_ldt)(const void *desc, unsigned entries);
116 unsigned long (*store_tr)(void);
117 void (*load_tls)(struct thread_struct *t, unsigned int cpu);
118 void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
120 void (*write_gdt_entry)(struct desc_struct *,
121 int entrynum, const void *desc, int size);
122 void (*write_idt_entry)(gate_desc *,
123 int entrynum, const gate_desc *gate);
124 void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
126 void (*set_iopl_mask)(unsigned mask);
128 void (*wbinvd)(void);
129 void (*io_delay)(void);
131 /* cpuid emulation, mostly so that caps bits can be disabled */
132 void (*cpuid)(unsigned int *eax, unsigned int *ebx,
133 unsigned int *ecx, unsigned int *edx);
135 /* MSR, PMC and TSR operations.
136 err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
137 u64 (*read_msr)(unsigned int msr, int *err);
138 int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
140 u64 (*read_tsc)(void);
141 u64 (*read_pmc)(int counter);
142 unsigned long long (*read_tscp)(unsigned int *aux);
144 /* These two are jmp to, not actually called. */
145 void (*irq_enable_syscall_ret)(void);
148 void (*swapgs)(void);
150 struct pv_lazy_ops lazy_mode;
154 void (*init_IRQ)(void);
157 * Get/set interrupt state. save_fl and restore_fl are only
158 * expected to use X86_EFLAGS_IF; all other bits
159 * returned from save_fl are undefined, and may be ignored by
162 unsigned long (*save_fl)(void);
163 void (*restore_fl)(unsigned long);
164 void (*irq_disable)(void);
165 void (*irq_enable)(void);
166 void (*safe_halt)(void);
171 #ifdef CONFIG_X86_LOCAL_APIC
173 * Direct APIC operations, principally for VMI. Ideally
174 * these shouldn't be in this interface.
176 void (*apic_write)(unsigned long reg, u32 v);
177 void (*apic_write_atomic)(unsigned long reg, u32 v);
178 u32 (*apic_read)(unsigned long reg);
179 void (*setup_boot_clock)(void);
180 void (*setup_secondary_clock)(void);
182 void (*startup_ipi_hook)(int phys_apicid,
183 unsigned long start_eip,
184 unsigned long start_esp);
190 * Called before/after init_mm pagetable setup. setup_start
191 * may reset %cr3, and may pre-install parts of the pagetable;
192 * pagetable setup is expected to preserve any existing
195 void (*pagetable_setup_start)(pgd_t *pgd_base);
196 void (*pagetable_setup_done)(pgd_t *pgd_base);
198 unsigned long (*read_cr2)(void);
199 void (*write_cr2)(unsigned long);
201 unsigned long (*read_cr3)(void);
202 void (*write_cr3)(unsigned long);
205 * Hooks for intercepting the creation/use/destruction of an
208 void (*activate_mm)(struct mm_struct *prev,
209 struct mm_struct *next);
210 void (*dup_mmap)(struct mm_struct *oldmm,
211 struct mm_struct *mm);
212 void (*exit_mmap)(struct mm_struct *mm);
216 void (*flush_tlb_user)(void);
217 void (*flush_tlb_kernel)(void);
218 void (*flush_tlb_single)(unsigned long addr);
219 void (*flush_tlb_others)(const cpumask_t *cpus, struct mm_struct *mm,
222 /* Hooks for allocating/releasing pagetable pages */
223 void (*alloc_pte)(struct mm_struct *mm, u32 pfn);
224 void (*alloc_pmd)(struct mm_struct *mm, u32 pfn);
225 void (*alloc_pmd_clone)(u32 pfn, u32 clonepfn, u32 start, u32 count);
226 void (*alloc_pud)(struct mm_struct *mm, u32 pfn);
227 void (*release_pte)(u32 pfn);
228 void (*release_pmd)(u32 pfn);
229 void (*release_pud)(u32 pfn);
231 /* Pagetable manipulation functions */
232 void (*set_pte)(pte_t *ptep, pte_t pteval);
233 void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
234 pte_t *ptep, pte_t pteval);
235 void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
236 void (*pte_update)(struct mm_struct *mm, unsigned long addr,
238 void (*pte_update_defer)(struct mm_struct *mm,
239 unsigned long addr, pte_t *ptep);
241 pteval_t (*pte_val)(pte_t);
242 pte_t (*make_pte)(pteval_t pte);
244 pgdval_t (*pgd_val)(pgd_t);
245 pgd_t (*make_pgd)(pgdval_t pgd);
247 #if PAGETABLE_LEVELS >= 3
248 #ifdef CONFIG_X86_PAE
249 void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
250 void (*set_pte_present)(struct mm_struct *mm, unsigned long addr,
251 pte_t *ptep, pte_t pte);
252 void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
254 void (*pmd_clear)(pmd_t *pmdp);
256 #endif /* CONFIG_X86_PAE */
258 void (*set_pud)(pud_t *pudp, pud_t pudval);
260 pmdval_t (*pmd_val)(pmd_t);
261 pmd_t (*make_pmd)(pmdval_t pmd);
263 #if PAGETABLE_LEVELS == 4
264 pudval_t (*pud_val)(pud_t);
265 pud_t (*make_pud)(pudval_t pud);
267 void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
268 #endif /* PAGETABLE_LEVELS == 4 */
269 #endif /* PAGETABLE_LEVELS >= 3 */
271 #ifdef CONFIG_HIGHPTE
272 void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
275 struct pv_lazy_ops lazy_mode;
279 /* Sometimes the physical address is a pfn, and sometimes its
280 an mfn. We can tell which is which from the index. */
281 void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
282 unsigned long phys, pgprot_t flags);
285 /* This contains all the paravirt structures: we get a convenient
286 * number for each function using the offset which we use to indicate
288 struct paravirt_patch_template {
289 struct pv_init_ops pv_init_ops;
290 struct pv_time_ops pv_time_ops;
291 struct pv_cpu_ops pv_cpu_ops;
292 struct pv_irq_ops pv_irq_ops;
293 struct pv_apic_ops pv_apic_ops;
294 struct pv_mmu_ops pv_mmu_ops;
297 extern struct pv_info pv_info;
298 extern struct pv_init_ops pv_init_ops;
299 extern struct pv_time_ops pv_time_ops;
300 extern struct pv_cpu_ops pv_cpu_ops;
301 extern struct pv_irq_ops pv_irq_ops;
302 extern struct pv_apic_ops pv_apic_ops;
303 extern struct pv_mmu_ops pv_mmu_ops;
305 #define PARAVIRT_PATCH(x) \
306 (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
308 #define paravirt_type(op) \
309 [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \
310 [paravirt_opptr] "m" (op)
311 #define paravirt_clobber(clobber) \
312 [paravirt_clobber] "i" (clobber)
315 * Generate some code, and mark it as patchable by the
316 * apply_paravirt() alternate instruction patcher.
318 #define _paravirt_alt(insn_string, type, clobber) \
319 "771:\n\t" insn_string "\n" "772:\n" \
320 ".pushsection .parainstructions,\"a\"\n" \
323 " .byte " type "\n" \
324 " .byte 772b-771b\n" \
325 " .short " clobber "\n" \
328 /* Generate patchable code, with the default asm parameters. */
329 #define paravirt_alt(insn_string) \
330 _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
332 /* Simple instruction patching code. */
333 #define DEF_NATIVE(ops, name, code) \
334 extern const char start_##ops##_##name[], end_##ops##_##name[]; \
335 asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
337 unsigned paravirt_patch_nop(void);
338 unsigned paravirt_patch_ignore(unsigned len);
339 unsigned paravirt_patch_call(void *insnbuf,
340 const void *target, u16 tgt_clobbers,
341 unsigned long addr, u16 site_clobbers,
343 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
344 unsigned long addr, unsigned len);
345 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
346 unsigned long addr, unsigned len);
348 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
349 const char *start, const char *end);
351 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
352 unsigned long addr, unsigned len);
354 int paravirt_disable_iospace(void);
357 * This generates an indirect call based on the operation type number.
358 * The type number, computed in PARAVIRT_PATCH, is derived from the
359 * offset into the paravirt_patch_template structure, and can therefore be
360 * freely converted back into a structure offset.
362 #define PARAVIRT_CALL "call *%[paravirt_opptr];"
365 * These macros are intended to wrap calls through one of the paravirt
366 * ops structs, so that they can be later identified and patched at
369 * Normally, a call to a pv_op function is a simple indirect call:
370 * (pv_op_struct.operations)(args...).
372 * Unfortunately, this is a relatively slow operation for modern CPUs,
373 * because it cannot necessarily determine what the destination
374 * address is. In this case, the address is a runtime constant, so at
375 * the very least we can patch the call to e a simple direct call, or
376 * ideally, patch an inline implementation into the callsite. (Direct
377 * calls are essentially free, because the call and return addresses
378 * are completely predictable.)
380 * For i386, these macros rely on the standard gcc "regparm(3)" calling
381 * convention, in which the first three arguments are placed in %eax,
382 * %edx, %ecx (in that order), and the remaining arguments are placed
383 * on the stack. All caller-save registers (eax,edx,ecx) are expected
384 * to be modified (either clobbered or used for return values).
385 * X86_64, on the other hand, already specifies a register-based calling
386 * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
387 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
388 * special handling for dealing with 4 arguments, unlike i386.
389 * However, x86_64 also have to clobber all caller saved registers, which
390 * unfortunately, are quite a bit (r8 - r11)
392 * The call instruction itself is marked by placing its start address
393 * and size into the .parainstructions section, so that
394 * apply_paravirt() in arch/i386/kernel/alternative.c can do the
395 * appropriate patching under the control of the backend pv_init_ops
398 * Unfortunately there's no way to get gcc to generate the args setup
399 * for the call, and then allow the call itself to be generated by an
400 * inline asm. Because of this, we must do the complete arg setup and
401 * return value handling from within these macros. This is fairly
404 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
405 * It could be extended to more arguments, but there would be little
406 * to be gained from that. For each number of arguments, there are
407 * the two VCALL and CALL variants for void and non-void functions.
409 * When there is a return value, the invoker of the macro must specify
410 * the return type. The macro then uses sizeof() on that type to
411 * determine whether its a 32 or 64 bit value, and places the return
412 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
413 * 64-bit). For x86_64 machines, it just returns at %rax regardless of
414 * the return value size.
416 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
417 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
420 * Small structures are passed and returned in registers. The macro
421 * calling convention can't directly deal with this, so the wrapper
422 * functions must do this.
424 * These PVOP_* macros are only defined within this header. This
425 * means that all uses must be wrapped in inline functions. This also
426 * makes sure the incoming and outgoing types are always correct.
429 #define PVOP_VCALL_ARGS unsigned long __eax, __edx, __ecx
430 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS
431 #define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \
433 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS
434 #define EXTRA_CLOBBERS
435 #define VEXTRA_CLOBBERS
437 #define PVOP_VCALL_ARGS unsigned long __edi, __esi, __edx, __ecx
438 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS, __eax
439 #define PVOP_VCALL_CLOBBERS "=D" (__edi), \
440 "=S" (__esi), "=d" (__edx), \
443 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax)
445 #define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11"
446 #define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
449 #define __PVOP_CALL(rettype, op, pre, post, ...) \
453 /* This is 32-bit specific, but is okay in 64-bit */ \
454 /* since this condition will never hold */ \
455 if (sizeof(rettype) > sizeof(unsigned long)) { \
457 paravirt_alt(PARAVIRT_CALL) \
459 : PVOP_CALL_CLOBBERS \
460 : paravirt_type(op), \
461 paravirt_clobber(CLBR_ANY), \
463 : "memory", "cc" EXTRA_CLOBBERS); \
464 __ret = (rettype)((((u64)__edx) << 32) | __eax); \
467 paravirt_alt(PARAVIRT_CALL) \
469 : PVOP_CALL_CLOBBERS \
470 : paravirt_type(op), \
471 paravirt_clobber(CLBR_ANY), \
473 : "memory", "cc" EXTRA_CLOBBERS); \
474 __ret = (rettype)__eax; \
478 #define __PVOP_VCALL(op, pre, post, ...) \
482 paravirt_alt(PARAVIRT_CALL) \
484 : PVOP_VCALL_CLOBBERS \
485 : paravirt_type(op), \
486 paravirt_clobber(CLBR_ANY), \
488 : "memory", "cc" VEXTRA_CLOBBERS); \
491 #define PVOP_CALL0(rettype, op) \
492 __PVOP_CALL(rettype, op, "", "")
493 #define PVOP_VCALL0(op) \
494 __PVOP_VCALL(op, "", "")
496 #define PVOP_CALL1(rettype, op, arg1) \
497 __PVOP_CALL(rettype, op, "", "", "0" ((unsigned long)(arg1)))
498 #define PVOP_VCALL1(op, arg1) \
499 __PVOP_VCALL(op, "", "", "0" ((unsigned long)(arg1)))
501 #define PVOP_CALL2(rettype, op, arg1, arg2) \
502 __PVOP_CALL(rettype, op, "", "", "0" ((unsigned long)(arg1)), \
503 "1" ((unsigned long)(arg2)))
504 #define PVOP_VCALL2(op, arg1, arg2) \
505 __PVOP_VCALL(op, "", "", "0" ((unsigned long)(arg1)), \
506 "1" ((unsigned long)(arg2)))
508 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \
509 __PVOP_CALL(rettype, op, "", "", "0" ((unsigned long)(arg1)), \
510 "1"((unsigned long)(arg2)), "2"((unsigned long)(arg3)))
511 #define PVOP_VCALL3(op, arg1, arg2, arg3) \
512 __PVOP_VCALL(op, "", "", "0" ((unsigned long)(arg1)), \
513 "1"((unsigned long)(arg2)), "2"((unsigned long)(arg3)))
515 /* This is the only difference in x86_64. We can make it much simpler */
517 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
518 __PVOP_CALL(rettype, op, \
519 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
520 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \
521 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
522 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
524 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
525 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \
526 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
528 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
529 __PVOP_CALL(rettype, op, "", "", "0" ((unsigned long)(arg1)), \
530 "1"((unsigned long)(arg2)), "2"((unsigned long)(arg3)), \
531 "3"((unsigned long)(arg4)))
532 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
533 __PVOP_VCALL(op, "", "", "0" ((unsigned long)(arg1)), \
534 "1"((unsigned long)(arg2)), "2"((unsigned long)(arg3)), \
535 "3"((unsigned long)(arg4)))
538 static inline int paravirt_enabled(void)
540 return pv_info.paravirt_enabled;
543 static inline void load_sp0(struct tss_struct *tss,
544 struct thread_struct *thread)
546 PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
549 #define ARCH_SETUP pv_init_ops.arch_setup();
550 static inline unsigned long get_wallclock(void)
552 return PVOP_CALL0(unsigned long, pv_time_ops.get_wallclock);
555 static inline int set_wallclock(unsigned long nowtime)
557 return PVOP_CALL1(int, pv_time_ops.set_wallclock, nowtime);
560 static inline void (*choose_time_init(void))(void)
562 return pv_time_ops.time_init;
565 /* The paravirtualized CPUID instruction. */
566 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
567 unsigned int *ecx, unsigned int *edx)
569 PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
573 * These special macros can be used to get or set a debugging register
575 static inline unsigned long paravirt_get_debugreg(int reg)
577 return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
579 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
580 static inline void set_debugreg(unsigned long val, int reg)
582 PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
585 static inline void clts(void)
587 PVOP_VCALL0(pv_cpu_ops.clts);
590 static inline unsigned long read_cr0(void)
592 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
595 static inline void write_cr0(unsigned long x)
597 PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
600 static inline unsigned long read_cr2(void)
602 return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
605 static inline void write_cr2(unsigned long x)
607 PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
610 static inline unsigned long read_cr3(void)
612 return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
615 static inline void write_cr3(unsigned long x)
617 PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
620 static inline unsigned long read_cr4(void)
622 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
624 static inline unsigned long read_cr4_safe(void)
626 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
629 static inline void write_cr4(unsigned long x)
631 PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
635 static inline unsigned long read_cr8(void)
637 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
640 static inline void write_cr8(unsigned long x)
642 PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
646 static inline void raw_safe_halt(void)
648 PVOP_VCALL0(pv_irq_ops.safe_halt);
651 static inline void halt(void)
653 PVOP_VCALL0(pv_irq_ops.safe_halt);
656 static inline void wbinvd(void)
658 PVOP_VCALL0(pv_cpu_ops.wbinvd);
661 #define get_kernel_rpl() (pv_info.kernel_rpl)
663 static inline u64 paravirt_read_msr(unsigned msr, int *err)
665 return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);
667 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
669 return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
672 /* These should all do BUG_ON(_err), but our headers are too tangled. */
673 #define rdmsr(msr, val1, val2) \
676 u64 _l = paravirt_read_msr(msr, &_err); \
681 #define wrmsr(msr, val1, val2) \
683 paravirt_write_msr(msr, val1, val2); \
686 #define rdmsrl(msr, val) \
689 val = paravirt_read_msr(msr, &_err); \
692 #define wrmsrl(msr, val) wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
693 #define wrmsr_safe(msr, a, b) paravirt_write_msr(msr, a, b)
695 /* rdmsr with exception handling */
696 #define rdmsr_safe(msr, a, b) \
699 u64 _l = paravirt_read_msr(msr, &_err); \
705 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
709 *p = paravirt_read_msr(msr, &err);
713 static inline u64 paravirt_read_tsc(void)
715 return PVOP_CALL0(u64, pv_cpu_ops.read_tsc);
718 #define rdtscl(low) \
720 u64 _l = paravirt_read_tsc(); \
724 #define rdtscll(val) (val = paravirt_read_tsc())
726 static inline unsigned long long paravirt_sched_clock(void)
728 return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
730 #define calculate_cpu_khz() (pv_time_ops.get_cpu_khz())
732 static inline unsigned long long paravirt_read_pmc(int counter)
734 return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
737 #define rdpmc(counter, low, high) \
739 u64 _l = paravirt_read_pmc(counter); \
744 static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
746 return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
749 #define rdtscp(low, high, aux) \
752 unsigned long __val = paravirt_rdtscp(&__aux); \
753 (low) = (u32)__val; \
754 (high) = (u32)(__val >> 32); \
758 #define rdtscpll(val, aux) \
760 unsigned long __aux; \
761 val = paravirt_rdtscp(&__aux); \
765 static inline void load_TR_desc(void)
767 PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
769 static inline void load_gdt(const struct desc_ptr *dtr)
771 PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
773 static inline void load_idt(const struct desc_ptr *dtr)
775 PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
777 static inline void set_ldt(const void *addr, unsigned entries)
779 PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
781 static inline void store_gdt(struct desc_ptr *dtr)
783 PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
785 static inline void store_idt(struct desc_ptr *dtr)
787 PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
789 static inline unsigned long paravirt_store_tr(void)
791 return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
793 #define store_tr(tr) ((tr) = paravirt_store_tr())
794 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
796 PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
799 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
802 PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
805 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
806 void *desc, int type)
808 PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
811 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
813 PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
815 static inline void set_iopl_mask(unsigned mask)
817 PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
820 /* The paravirtualized I/O functions */
821 static inline void slow_down_io(void)
823 pv_cpu_ops.io_delay();
824 #ifdef REALLY_SLOW_IO
825 pv_cpu_ops.io_delay();
826 pv_cpu_ops.io_delay();
827 pv_cpu_ops.io_delay();
831 #ifdef CONFIG_X86_LOCAL_APIC
833 * Basic functions accessing APICs.
835 static inline void apic_write(unsigned long reg, u32 v)
837 PVOP_VCALL2(pv_apic_ops.apic_write, reg, v);
840 static inline void apic_write_atomic(unsigned long reg, u32 v)
842 PVOP_VCALL2(pv_apic_ops.apic_write_atomic, reg, v);
845 static inline u32 apic_read(unsigned long reg)
847 return PVOP_CALL1(unsigned long, pv_apic_ops.apic_read, reg);
850 static inline void setup_boot_clock(void)
852 PVOP_VCALL0(pv_apic_ops.setup_boot_clock);
855 static inline void setup_secondary_clock(void)
857 PVOP_VCALL0(pv_apic_ops.setup_secondary_clock);
861 static inline void paravirt_post_allocator_init(void)
863 if (pv_init_ops.post_allocator_init)
864 (*pv_init_ops.post_allocator_init)();
867 static inline void paravirt_pagetable_setup_start(pgd_t *base)
869 (*pv_mmu_ops.pagetable_setup_start)(base);
872 static inline void paravirt_pagetable_setup_done(pgd_t *base)
874 (*pv_mmu_ops.pagetable_setup_done)(base);
878 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
879 unsigned long start_esp)
881 PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
882 phys_apicid, start_eip, start_esp);
886 static inline void paravirt_activate_mm(struct mm_struct *prev,
887 struct mm_struct *next)
889 PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
892 static inline void arch_dup_mmap(struct mm_struct *oldmm,
893 struct mm_struct *mm)
895 PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
898 static inline void arch_exit_mmap(struct mm_struct *mm)
900 PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
903 static inline void __flush_tlb(void)
905 PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
907 static inline void __flush_tlb_global(void)
909 PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
911 static inline void __flush_tlb_single(unsigned long addr)
913 PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
916 static inline void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
919 PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, &cpumask, mm, va);
922 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned pfn)
924 PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
926 static inline void paravirt_release_pte(unsigned pfn)
928 PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
931 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned pfn)
933 PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
936 static inline void paravirt_alloc_pmd_clone(unsigned pfn, unsigned clonepfn,
937 unsigned start, unsigned count)
939 PVOP_VCALL4(pv_mmu_ops.alloc_pmd_clone, pfn, clonepfn, start, count);
941 static inline void paravirt_release_pmd(unsigned pfn)
943 PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
946 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned pfn)
948 PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
950 static inline void paravirt_release_pud(unsigned pfn)
952 PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
955 #ifdef CONFIG_HIGHPTE
956 static inline void *kmap_atomic_pte(struct page *page, enum km_type type)
959 ret = PVOP_CALL2(unsigned long, pv_mmu_ops.kmap_atomic_pte, page, type);
964 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
967 PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
970 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
973 PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
976 static inline pte_t __pte(pteval_t val)
980 if (sizeof(pteval_t) > sizeof(long))
981 ret = PVOP_CALL2(pteval_t,
983 val, (u64)val >> 32);
985 ret = PVOP_CALL1(pteval_t,
989 return (pte_t) { .pte = ret };
992 static inline pteval_t pte_val(pte_t pte)
996 if (sizeof(pteval_t) > sizeof(long))
997 ret = PVOP_CALL2(pteval_t, pv_mmu_ops.pte_val,
998 pte.pte, (u64)pte.pte >> 32);
1000 ret = PVOP_CALL1(pteval_t, pv_mmu_ops.pte_val,
1006 static inline pgd_t __pgd(pgdval_t val)
1010 if (sizeof(pgdval_t) > sizeof(long))
1011 ret = PVOP_CALL2(pgdval_t, pv_mmu_ops.make_pgd,
1012 val, (u64)val >> 32);
1014 ret = PVOP_CALL1(pgdval_t, pv_mmu_ops.make_pgd,
1017 return (pgd_t) { ret };
1020 static inline pgdval_t pgd_val(pgd_t pgd)
1024 if (sizeof(pgdval_t) > sizeof(long))
1025 ret = PVOP_CALL2(pgdval_t, pv_mmu_ops.pgd_val,
1026 pgd.pgd, (u64)pgd.pgd >> 32);
1028 ret = PVOP_CALL1(pgdval_t, pv_mmu_ops.pgd_val,
1034 static inline void set_pte(pte_t *ptep, pte_t pte)
1036 if (sizeof(pteval_t) > sizeof(long))
1037 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
1038 pte.pte, (u64)pte.pte >> 32);
1040 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
1044 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
1045 pte_t *ptep, pte_t pte)
1047 if (sizeof(pteval_t) > sizeof(long))
1049 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
1051 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
1054 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
1056 pmdval_t val = native_pmd_val(pmd);
1058 if (sizeof(pmdval_t) > sizeof(long))
1059 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
1061 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
1064 #if PAGETABLE_LEVELS >= 3
1065 static inline pmd_t __pmd(pmdval_t val)
1069 if (sizeof(pmdval_t) > sizeof(long))
1070 ret = PVOP_CALL2(pmdval_t, pv_mmu_ops.make_pmd,
1071 val, (u64)val >> 32);
1073 ret = PVOP_CALL1(pmdval_t, pv_mmu_ops.make_pmd,
1076 return (pmd_t) { ret };
1079 static inline pmdval_t pmd_val(pmd_t pmd)
1083 if (sizeof(pmdval_t) > sizeof(long))
1084 ret = PVOP_CALL2(pmdval_t, pv_mmu_ops.pmd_val,
1085 pmd.pmd, (u64)pmd.pmd >> 32);
1087 ret = PVOP_CALL1(pmdval_t, pv_mmu_ops.pmd_val,
1093 static inline void set_pud(pud_t *pudp, pud_t pud)
1095 pudval_t val = native_pud_val(pud);
1097 if (sizeof(pudval_t) > sizeof(long))
1098 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
1099 val, (u64)val >> 32);
1101 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
1104 #if PAGETABLE_LEVELS == 4
1105 static inline pud_t __pud(pudval_t val)
1109 if (sizeof(pudval_t) > sizeof(long))
1110 ret = PVOP_CALL2(pudval_t, pv_mmu_ops.make_pud,
1111 val, (u64)val >> 32);
1113 ret = PVOP_CALL1(pudval_t, pv_mmu_ops.make_pud,
1116 return (pud_t) { ret };
1119 static inline pudval_t pud_val(pud_t pud)
1123 if (sizeof(pudval_t) > sizeof(long))
1124 ret = PVOP_CALL2(pudval_t, pv_mmu_ops.pud_val,
1125 pud.pud, (u64)pud.pud >> 32);
1127 ret = PVOP_CALL1(pudval_t, pv_mmu_ops.pud_val,
1133 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
1135 pgdval_t val = native_pgd_val(pgd);
1137 if (sizeof(pgdval_t) > sizeof(long))
1138 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
1139 val, (u64)val >> 32);
1141 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
1145 static inline void pgd_clear(pgd_t *pgdp)
1147 set_pgd(pgdp, __pgd(0));
1150 static inline void pud_clear(pud_t *pudp)
1152 set_pud(pudp, __pud(0));
1155 #endif /* PAGETABLE_LEVELS == 4 */
1157 #endif /* PAGETABLE_LEVELS >= 3 */
1159 #ifdef CONFIG_X86_PAE
1160 /* Special-case pte-setting operations for PAE, which can't update a
1161 64-bit pte atomically */
1162 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
1164 PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
1165 pte.pte, pte.pte >> 32);
1168 static inline void set_pte_present(struct mm_struct *mm, unsigned long addr,
1169 pte_t *ptep, pte_t pte)
1172 pv_mmu_ops.set_pte_present(mm, addr, ptep, pte);
1175 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
1178 PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
1181 static inline void pmd_clear(pmd_t *pmdp)
1183 PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
1185 #else /* !CONFIG_X86_PAE */
1186 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
1191 static inline void set_pte_present(struct mm_struct *mm, unsigned long addr,
1192 pte_t *ptep, pte_t pte)
1197 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
1200 set_pte_at(mm, addr, ptep, __pte(0));
1203 static inline void pmd_clear(pmd_t *pmdp)
1205 set_pmd(pmdp, __pmd(0));
1207 #endif /* CONFIG_X86_PAE */
1209 /* Lazy mode for batching updates / context switch */
1210 enum paravirt_lazy_mode {
1216 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
1217 void paravirt_enter_lazy_cpu(void);
1218 void paravirt_leave_lazy_cpu(void);
1219 void paravirt_enter_lazy_mmu(void);
1220 void paravirt_leave_lazy_mmu(void);
1221 void paravirt_leave_lazy(enum paravirt_lazy_mode mode);
1223 #define __HAVE_ARCH_ENTER_LAZY_CPU_MODE
1224 static inline void arch_enter_lazy_cpu_mode(void)
1226 PVOP_VCALL0(pv_cpu_ops.lazy_mode.enter);
1229 static inline void arch_leave_lazy_cpu_mode(void)
1231 PVOP_VCALL0(pv_cpu_ops.lazy_mode.leave);
1234 static inline void arch_flush_lazy_cpu_mode(void)
1236 if (unlikely(paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU)) {
1237 arch_leave_lazy_cpu_mode();
1238 arch_enter_lazy_cpu_mode();
1243 #define __HAVE_ARCH_ENTER_LAZY_MMU_MODE
1244 static inline void arch_enter_lazy_mmu_mode(void)
1246 PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
1249 static inline void arch_leave_lazy_mmu_mode(void)
1251 PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
1254 static inline void arch_flush_lazy_mmu_mode(void)
1256 if (unlikely(paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU)) {
1257 arch_leave_lazy_mmu_mode();
1258 arch_enter_lazy_mmu_mode();
1262 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
1263 unsigned long phys, pgprot_t flags)
1265 pv_mmu_ops.set_fixmap(idx, phys, flags);
1268 void _paravirt_nop(void);
1269 #define paravirt_nop ((void *)_paravirt_nop)
1271 /* These all sit in the .parainstructions section to tell us what to patch. */
1272 struct paravirt_patch_site {
1273 u8 *instr; /* original instructions */
1274 u8 instrtype; /* type of this instruction */
1275 u8 len; /* length of original instruction */
1276 u16 clobbers; /* what registers you may clobber */
1279 extern struct paravirt_patch_site __parainstructions[],
1280 __parainstructions_end[];
1282 #ifdef CONFIG_X86_32
1283 #define PV_SAVE_REGS "pushl %%ecx; pushl %%edx;"
1284 #define PV_RESTORE_REGS "popl %%edx; popl %%ecx"
1285 #define PV_FLAGS_ARG "0"
1286 #define PV_EXTRA_CLOBBERS
1287 #define PV_VEXTRA_CLOBBERS
1289 /* We save some registers, but all of them, that's too much. We clobber all
1290 * caller saved registers but the argument parameter */
1291 #define PV_SAVE_REGS "pushq %%rdi;"
1292 #define PV_RESTORE_REGS "popq %%rdi;"
1293 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx"
1294 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx"
1295 #define PV_FLAGS_ARG "D"
1298 static inline unsigned long __raw_local_save_flags(void)
1302 asm volatile(paravirt_alt(PV_SAVE_REGS
1306 : paravirt_type(pv_irq_ops.save_fl),
1307 paravirt_clobber(CLBR_EAX)
1308 : "memory", "cc" PV_VEXTRA_CLOBBERS);
1312 static inline void raw_local_irq_restore(unsigned long f)
1314 asm volatile(paravirt_alt(PV_SAVE_REGS
1319 paravirt_type(pv_irq_ops.restore_fl),
1320 paravirt_clobber(CLBR_EAX)
1321 : "memory", "cc" PV_EXTRA_CLOBBERS);
1324 static inline void raw_local_irq_disable(void)
1326 asm volatile(paravirt_alt(PV_SAVE_REGS
1330 : paravirt_type(pv_irq_ops.irq_disable),
1331 paravirt_clobber(CLBR_EAX)
1332 : "memory", "eax", "cc" PV_EXTRA_CLOBBERS);
1335 static inline void raw_local_irq_enable(void)
1337 asm volatile(paravirt_alt(PV_SAVE_REGS
1341 : paravirt_type(pv_irq_ops.irq_enable),
1342 paravirt_clobber(CLBR_EAX)
1343 : "memory", "eax", "cc" PV_EXTRA_CLOBBERS);
1346 static inline unsigned long __raw_local_irq_save(void)
1350 f = __raw_local_save_flags();
1351 raw_local_irq_disable();
1355 /* Make sure as little as possible of this mess escapes. */
1356 #undef PARAVIRT_CALL
1370 #else /* __ASSEMBLY__ */
1372 #define _PVSITE(ptype, clobbers, ops, word, algn) \
1376 .pushsection .parainstructions,"a"; \
1385 #ifdef CONFIG_X86_64
1386 #define PV_SAVE_REGS pushq %rax; pushq %rdi; pushq %rcx; pushq %rdx
1387 #define PV_RESTORE_REGS popq %rdx; popq %rcx; popq %rdi; popq %rax
1388 #define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 8)
1389 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
1391 #define PV_SAVE_REGS pushl %eax; pushl %edi; pushl %ecx; pushl %edx
1392 #define PV_RESTORE_REGS popl %edx; popl %ecx; popl %edi; popl %eax
1393 #define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 4)
1394 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
1397 #define INTERRUPT_RETURN \
1398 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE, \
1399 jmp *%cs:pv_cpu_ops+PV_CPU_iret)
1401 #define DISABLE_INTERRUPTS(clobbers) \
1402 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
1404 call *%cs:pv_irq_ops+PV_IRQ_irq_disable; \
1407 #define ENABLE_INTERRUPTS(clobbers) \
1408 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers, \
1410 call *%cs:pv_irq_ops+PV_IRQ_irq_enable; \
1413 #define ENABLE_INTERRUPTS_SYSCALL_RET \
1414 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_syscall_ret),\
1416 jmp *%cs:pv_cpu_ops+PV_CPU_irq_enable_syscall_ret)
1419 #ifdef CONFIG_X86_32
1420 #define GET_CR0_INTO_EAX \
1421 push %ecx; push %edx; \
1422 call *pv_cpu_ops+PV_CPU_read_cr0; \
1426 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \
1428 call *pv_cpu_ops+PV_CPU_swapgs; \
1432 #define GET_CR2_INTO_RCX \
1433 call *pv_mmu_ops+PV_MMU_read_cr2; \
1439 #endif /* __ASSEMBLY__ */
1440 #endif /* CONFIG_PARAVIRT */
1441 #endif /* __ASM_PARAVIRT_H */