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>
18 #include <linux/cpumask.h>
19 #include <asm/kmap_types.h>
20 #include <asm/desc_defs.h>
31 unsigned int kernel_rpl;
32 int shared_kernel_pmd;
39 * Patch may replace one of the defined code sequences with
40 * arbitrary code, subject to the same register constraints.
41 * This generally means the code is not free to clobber any
42 * registers other than EAX. The patch function should return
43 * the number of bytes of code generated, as we nop pad the
44 * rest in generic code.
46 unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
47 unsigned long addr, unsigned len);
49 /* Basic arch-specific setup */
50 void (*arch_setup)(void);
51 char *(*memory_setup)(void);
52 void (*post_allocator_init)(void);
54 /* Print a banner to identify the environment */
60 /* Set deferred update mode, used for batching operations. */
66 void (*time_init)(void);
68 /* Set and set time of day */
69 unsigned long (*get_wallclock)(void);
70 int (*set_wallclock)(unsigned long);
72 unsigned long long (*sched_clock)(void);
73 unsigned long (*get_cpu_khz)(void);
77 /* hooks for various privileged instructions */
78 unsigned long (*get_debugreg)(int regno);
79 void (*set_debugreg)(int regno, unsigned long value);
83 unsigned long (*read_cr0)(void);
84 void (*write_cr0)(unsigned long);
86 unsigned long (*read_cr4_safe)(void);
87 unsigned long (*read_cr4)(void);
88 void (*write_cr4)(unsigned long);
90 /* Segment descriptor handling */
91 void (*load_tr_desc)(void);
92 void (*load_gdt)(const struct desc_ptr *);
93 void (*load_idt)(const struct desc_ptr *);
94 void (*store_gdt)(struct desc_ptr *);
95 void (*store_idt)(struct desc_ptr *);
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 *ldt, int entrynum,
101 void (*write_gdt_entry)(struct desc_struct *,
102 int entrynum, const void *desc, int size);
103 void (*write_idt_entry)(gate_desc *,
104 int entrynum, const gate_desc *gate);
105 void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
107 void (*set_iopl_mask)(unsigned mask);
109 void (*wbinvd)(void);
110 void (*io_delay)(void);
112 /* cpuid emulation, mostly so that caps bits can be disabled */
113 void (*cpuid)(unsigned int *eax, unsigned int *ebx,
114 unsigned int *ecx, unsigned int *edx);
116 /* MSR, PMC and TSR operations.
117 err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
118 u64 (*read_msr)(unsigned int msr, int *err);
119 int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
121 u64 (*read_tsc)(void);
122 u64 (*read_pmc)(int counter);
123 unsigned long long (*read_tscp)(unsigned int *aux);
125 /* These two are jmp to, not actually called. */
126 void (*irq_enable_syscall_ret)(void);
129 struct pv_lazy_ops lazy_mode;
133 void (*init_IRQ)(void);
136 * Get/set interrupt state. save_fl and restore_fl are only
137 * expected to use X86_EFLAGS_IF; all other bits
138 * returned from save_fl are undefined, and may be ignored by
141 unsigned long (*save_fl)(void);
142 void (*restore_fl)(unsigned long);
143 void (*irq_disable)(void);
144 void (*irq_enable)(void);
145 void (*safe_halt)(void);
150 #ifdef CONFIG_X86_LOCAL_APIC
152 * Direct APIC operations, principally for VMI. Ideally
153 * these shouldn't be in this interface.
155 void (*apic_write)(unsigned long reg, u32 v);
156 void (*apic_write_atomic)(unsigned long reg, u32 v);
157 u32 (*apic_read)(unsigned long reg);
158 void (*setup_boot_clock)(void);
159 void (*setup_secondary_clock)(void);
161 void (*startup_ipi_hook)(int phys_apicid,
162 unsigned long start_eip,
163 unsigned long start_esp);
169 * Called before/after init_mm pagetable setup. setup_start
170 * may reset %cr3, and may pre-install parts of the pagetable;
171 * pagetable setup is expected to preserve any existing
174 void (*pagetable_setup_start)(pgd_t *pgd_base);
175 void (*pagetable_setup_done)(pgd_t *pgd_base);
177 unsigned long (*read_cr2)(void);
178 void (*write_cr2)(unsigned long);
180 unsigned long (*read_cr3)(void);
181 void (*write_cr3)(unsigned long);
184 * Hooks for intercepting the creation/use/destruction of an
187 void (*activate_mm)(struct mm_struct *prev,
188 struct mm_struct *next);
189 void (*dup_mmap)(struct mm_struct *oldmm,
190 struct mm_struct *mm);
191 void (*exit_mmap)(struct mm_struct *mm);
195 void (*flush_tlb_user)(void);
196 void (*flush_tlb_kernel)(void);
197 void (*flush_tlb_single)(unsigned long addr);
198 void (*flush_tlb_others)(const cpumask_t *cpus, struct mm_struct *mm,
201 /* Hooks for allocating/releasing pagetable pages */
202 void (*alloc_pt)(struct mm_struct *mm, u32 pfn);
203 void (*alloc_pd)(u32 pfn);
204 void (*alloc_pd_clone)(u32 pfn, u32 clonepfn, u32 start, u32 count);
205 void (*release_pt)(u32 pfn);
206 void (*release_pd)(u32 pfn);
208 /* Pagetable manipulation functions */
209 void (*set_pte)(pte_t *ptep, pte_t pteval);
210 void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
211 pte_t *ptep, pte_t pteval);
212 void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
213 void (*pte_update)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
214 void (*pte_update_defer)(struct mm_struct *mm,
215 unsigned long addr, pte_t *ptep);
217 #ifdef CONFIG_X86_PAE
218 void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
219 void (*set_pte_present)(struct mm_struct *mm, unsigned long addr,
220 pte_t *ptep, pte_t pte);
221 void (*set_pud)(pud_t *pudp, pud_t pudval);
222 void (*pte_clear)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
223 void (*pmd_clear)(pmd_t *pmdp);
225 unsigned long long (*pte_val)(pte_t);
226 unsigned long long (*pmd_val)(pmd_t);
227 unsigned long long (*pgd_val)(pgd_t);
229 pte_t (*make_pte)(unsigned long long pte);
230 pmd_t (*make_pmd)(unsigned long long pmd);
231 pgd_t (*make_pgd)(unsigned long long pgd);
233 unsigned long (*pte_val)(pte_t);
234 unsigned long (*pgd_val)(pgd_t);
236 pte_t (*make_pte)(unsigned long pte);
237 pgd_t (*make_pgd)(unsigned long pgd);
240 #ifdef CONFIG_HIGHPTE
241 void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
244 struct pv_lazy_ops lazy_mode;
247 /* This contains all the paravirt structures: we get a convenient
248 * number for each function using the offset which we use to indicate
250 struct paravirt_patch_template
252 struct pv_init_ops pv_init_ops;
253 struct pv_time_ops pv_time_ops;
254 struct pv_cpu_ops pv_cpu_ops;
255 struct pv_irq_ops pv_irq_ops;
256 struct pv_apic_ops pv_apic_ops;
257 struct pv_mmu_ops pv_mmu_ops;
260 extern struct pv_info pv_info;
261 extern struct pv_init_ops pv_init_ops;
262 extern struct pv_time_ops pv_time_ops;
263 extern struct pv_cpu_ops pv_cpu_ops;
264 extern struct pv_irq_ops pv_irq_ops;
265 extern struct pv_apic_ops pv_apic_ops;
266 extern struct pv_mmu_ops pv_mmu_ops;
268 #define PARAVIRT_PATCH(x) \
269 (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
271 #define paravirt_type(op) \
272 [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \
273 [paravirt_opptr] "m" (op)
274 #define paravirt_clobber(clobber) \
275 [paravirt_clobber] "i" (clobber)
278 * Generate some code, and mark it as patchable by the
279 * apply_paravirt() alternate instruction patcher.
281 #define _paravirt_alt(insn_string, type, clobber) \
282 "771:\n\t" insn_string "\n" "772:\n" \
283 ".pushsection .parainstructions,\"a\"\n" \
285 " .byte " type "\n" \
286 " .byte 772b-771b\n" \
287 " .short " clobber "\n" \
290 /* Generate patchable code, with the default asm parameters. */
291 #define paravirt_alt(insn_string) \
292 _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
294 unsigned paravirt_patch_nop(void);
295 unsigned paravirt_patch_ignore(unsigned len);
296 unsigned paravirt_patch_call(void *insnbuf,
297 const void *target, u16 tgt_clobbers,
298 unsigned long addr, u16 site_clobbers,
300 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
301 unsigned long addr, unsigned len);
302 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
303 unsigned long addr, unsigned len);
305 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
306 const char *start, const char *end);
308 int paravirt_disable_iospace(void);
311 * This generates an indirect call based on the operation type number.
312 * The type number, computed in PARAVIRT_PATCH, is derived from the
313 * offset into the paravirt_patch_template structure, and can therefore be
314 * freely converted back into a structure offset.
316 #define PARAVIRT_CALL "call *%[paravirt_opptr];"
319 * These macros are intended to wrap calls through one of the paravirt
320 * ops structs, so that they can be later identified and patched at
323 * Normally, a call to a pv_op function is a simple indirect call:
324 * (pv_op_struct.operations)(args...).
326 * Unfortunately, this is a relatively slow operation for modern CPUs,
327 * because it cannot necessarily determine what the destination
328 * address is. In this case, the address is a runtime constant, so at
329 * the very least we can patch the call to e a simple direct call, or
330 * ideally, patch an inline implementation into the callsite. (Direct
331 * calls are essentially free, because the call and return addresses
332 * are completely predictable.)
334 * For i386, these macros rely on the standard gcc "regparm(3)" calling
335 * convention, in which the first three arguments are placed in %eax,
336 * %edx, %ecx (in that order), and the remaining arguments are placed
337 * on the stack. All caller-save registers (eax,edx,ecx) are expected
338 * to be modified (either clobbered or used for return values).
339 * X86_64, on the other hand, already specifies a register-based calling
340 * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
341 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
342 * special handling for dealing with 4 arguments, unlike i386.
343 * However, x86_64 also have to clobber all caller saved registers, which
344 * unfortunately, are quite a bit (r8 - r11)
346 * The call instruction itself is marked by placing its start address
347 * and size into the .parainstructions section, so that
348 * apply_paravirt() in arch/i386/kernel/alternative.c can do the
349 * appropriate patching under the control of the backend pv_init_ops
352 * Unfortunately there's no way to get gcc to generate the args setup
353 * for the call, and then allow the call itself to be generated by an
354 * inline asm. Because of this, we must do the complete arg setup and
355 * return value handling from within these macros. This is fairly
358 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
359 * It could be extended to more arguments, but there would be little
360 * to be gained from that. For each number of arguments, there are
361 * the two VCALL and CALL variants for void and non-void functions.
363 * When there is a return value, the invoker of the macro must specify
364 * the return type. The macro then uses sizeof() on that type to
365 * determine whether its a 32 or 64 bit value, and places the return
366 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
367 * 64-bit). For x86_64 machines, it just returns at %rax regardless of
368 * the return value size.
370 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
371 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
374 * Small structures are passed and returned in registers. The macro
375 * calling convention can't directly deal with this, so the wrapper
376 * functions must do this.
378 * These PVOP_* macros are only defined within this header. This
379 * means that all uses must be wrapped in inline functions. This also
380 * makes sure the incoming and outgoing types are always correct.
383 #define PVOP_VCALL_ARGS unsigned long __eax, __edx, __ecx
384 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS
385 #define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \
387 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS
388 #define EXTRA_CLOBBERS
389 #define VEXTRA_CLOBBERS
391 #define PVOP_VCALL_ARGS unsigned long __edi, __esi, __edx, __ecx
392 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS, __eax
393 #define PVOP_VCALL_CLOBBERS "=D" (__edi), \
394 "=S" (__esi), "=d" (__edx), \
397 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax)
399 #define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11"
400 #define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
403 #define __PVOP_CALL(rettype, op, pre, post, ...) \
407 /* This is 32-bit specific, but is okay in 64-bit */ \
408 /* since this condition will never hold */ \
409 if (sizeof(rettype) > sizeof(unsigned long)) { \
411 paravirt_alt(PARAVIRT_CALL) \
413 : PVOP_CALL_CLOBBERS \
414 : paravirt_type(op), \
415 paravirt_clobber(CLBR_ANY), \
417 : "memory", "cc" EXTRA_CLOBBERS); \
418 __ret = (rettype)((((u64)__edx) << 32) | __eax); \
421 paravirt_alt(PARAVIRT_CALL) \
423 : PVOP_CALL_CLOBBERS \
424 : paravirt_type(op), \
425 paravirt_clobber(CLBR_ANY), \
427 : "memory", "cc" EXTRA_CLOBBERS); \
428 __ret = (rettype)__eax; \
432 #define __PVOP_VCALL(op, pre, post, ...) \
436 paravirt_alt(PARAVIRT_CALL) \
438 : PVOP_VCALL_CLOBBERS \
439 : paravirt_type(op), \
440 paravirt_clobber(CLBR_ANY), \
442 : "memory", "cc" VEXTRA_CLOBBERS); \
445 #define PVOP_CALL0(rettype, op) \
446 __PVOP_CALL(rettype, op, "", "")
447 #define PVOP_VCALL0(op) \
448 __PVOP_VCALL(op, "", "")
450 #define PVOP_CALL1(rettype, op, arg1) \
451 __PVOP_CALL(rettype, op, "", "", "0" ((unsigned long)(arg1)))
452 #define PVOP_VCALL1(op, arg1) \
453 __PVOP_VCALL(op, "", "", "0" ((unsigned long)(arg1)))
455 #define PVOP_CALL2(rettype, op, arg1, arg2) \
456 __PVOP_CALL(rettype, op, "", "", "0" ((unsigned long)(arg1)), \
457 "1" ((unsigned long)(arg2)))
458 #define PVOP_VCALL2(op, arg1, arg2) \
459 __PVOP_VCALL(op, "", "", "0" ((unsigned long)(arg1)), \
460 "1" ((unsigned long)(arg2)))
462 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \
463 __PVOP_CALL(rettype, op, "", "", "0" ((unsigned long)(arg1)), \
464 "1"((unsigned long)(arg2)), "2"((unsigned long)(arg3)))
465 #define PVOP_VCALL3(op, arg1, arg2, arg3) \
466 __PVOP_VCALL(op, "", "", "0" ((unsigned long)(arg1)), \
467 "1"((unsigned long)(arg2)), "2"((unsigned long)(arg3)))
469 /* This is the only difference in x86_64. We can make it much simpler */
471 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
472 __PVOP_CALL(rettype, op, \
473 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
474 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \
475 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
476 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
478 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
479 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \
480 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
482 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
483 __PVOP_CALL(rettype, op, "", "", "0" ((unsigned long)(arg1)), \
484 "1"((unsigned long)(arg2)), "2"((unsigned long)(arg3)), \
485 "3"((unsigned long)(arg4)))
486 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
487 __PVOP_VCALL(op, "", "", "0" ((unsigned long)(arg1)), \
488 "1"((unsigned long)(arg2)), "2"((unsigned long)(arg3)), \
489 "3"((unsigned long)(arg4)))
492 static inline int paravirt_enabled(void)
494 return pv_info.paravirt_enabled;
497 static inline void load_sp0(struct tss_struct *tss,
498 struct thread_struct *thread)
500 PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
503 #define ARCH_SETUP pv_init_ops.arch_setup();
504 static inline unsigned long get_wallclock(void)
506 return PVOP_CALL0(unsigned long, pv_time_ops.get_wallclock);
509 static inline int set_wallclock(unsigned long nowtime)
511 return PVOP_CALL1(int, pv_time_ops.set_wallclock, nowtime);
514 static inline void (*choose_time_init(void))(void)
516 return pv_time_ops.time_init;
519 /* The paravirtualized CPUID instruction. */
520 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
521 unsigned int *ecx, unsigned int *edx)
523 PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
527 * These special macros can be used to get or set a debugging register
529 static inline unsigned long paravirt_get_debugreg(int reg)
531 return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
533 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
534 static inline void set_debugreg(unsigned long val, int reg)
536 PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
539 static inline void clts(void)
541 PVOP_VCALL0(pv_cpu_ops.clts);
544 static inline unsigned long read_cr0(void)
546 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
549 static inline void write_cr0(unsigned long x)
551 PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
554 static inline unsigned long read_cr2(void)
556 return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
559 static inline void write_cr2(unsigned long x)
561 PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
564 static inline unsigned long read_cr3(void)
566 return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
569 static inline void write_cr3(unsigned long x)
571 PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
574 static inline unsigned long read_cr4(void)
576 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
578 static inline unsigned long read_cr4_safe(void)
580 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
583 static inline void write_cr4(unsigned long x)
585 PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
588 static inline void raw_safe_halt(void)
590 PVOP_VCALL0(pv_irq_ops.safe_halt);
593 static inline void halt(void)
595 PVOP_VCALL0(pv_irq_ops.safe_halt);
598 static inline void wbinvd(void)
600 PVOP_VCALL0(pv_cpu_ops.wbinvd);
603 #define get_kernel_rpl() (pv_info.kernel_rpl)
605 static inline u64 paravirt_read_msr(unsigned msr, int *err)
607 return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);
609 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
611 return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
614 /* These should all do BUG_ON(_err), but our headers are too tangled. */
615 #define rdmsr(msr,val1,val2) do { \
617 u64 _l = paravirt_read_msr(msr, &_err); \
622 #define wrmsr(msr,val1,val2) do { \
623 paravirt_write_msr(msr, val1, val2); \
626 #define rdmsrl(msr,val) do { \
628 val = paravirt_read_msr(msr, &_err); \
631 #define wrmsrl(msr,val) wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
632 #define wrmsr_safe(msr,a,b) paravirt_write_msr(msr, a, b)
634 /* rdmsr with exception handling */
635 #define rdmsr_safe(msr,a,b) ({ \
637 u64 _l = paravirt_read_msr(msr, &_err); \
643 static inline u64 paravirt_read_tsc(void)
645 return PVOP_CALL0(u64, pv_cpu_ops.read_tsc);
648 #define rdtscl(low) do { \
649 u64 _l = paravirt_read_tsc(); \
653 #define rdtscll(val) (val = paravirt_read_tsc())
655 static inline unsigned long long paravirt_sched_clock(void)
657 return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
659 #define calculate_cpu_khz() (pv_time_ops.get_cpu_khz())
661 static inline unsigned long long paravirt_read_pmc(int counter)
663 return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
666 #define rdpmc(counter,low,high) do { \
667 u64 _l = paravirt_read_pmc(counter); \
672 static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
674 return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
677 #define rdtscp(low, high, aux) \
680 unsigned long __val = paravirt_rdtscp(&__aux); \
681 (low) = (u32)__val; \
682 (high) = (u32)(__val >> 32); \
686 #define rdtscpll(val, aux) \
688 unsigned long __aux; \
689 val = paravirt_rdtscp(&__aux); \
693 static inline void load_TR_desc(void)
695 PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
697 static inline void load_gdt(const struct desc_ptr *dtr)
699 PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
701 static inline void load_idt(const struct desc_ptr *dtr)
703 PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
705 static inline void set_ldt(const void *addr, unsigned entries)
707 PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
709 static inline void store_gdt(struct desc_ptr *dtr)
711 PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
713 static inline void store_idt(struct desc_ptr *dtr)
715 PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
717 static inline unsigned long paravirt_store_tr(void)
719 return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
721 #define store_tr(tr) ((tr) = paravirt_store_tr())
722 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
724 PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
727 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
730 PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
733 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
734 void *desc, int type)
736 PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
739 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
741 PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
743 static inline void set_iopl_mask(unsigned mask)
745 PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
748 /* The paravirtualized I/O functions */
749 static inline void slow_down_io(void) {
750 pv_cpu_ops.io_delay();
751 #ifdef REALLY_SLOW_IO
752 pv_cpu_ops.io_delay();
753 pv_cpu_ops.io_delay();
754 pv_cpu_ops.io_delay();
758 #ifdef CONFIG_X86_LOCAL_APIC
760 * Basic functions accessing APICs.
762 static inline void apic_write(unsigned long reg, u32 v)
764 PVOP_VCALL2(pv_apic_ops.apic_write, reg, v);
767 static inline void apic_write_atomic(unsigned long reg, u32 v)
769 PVOP_VCALL2(pv_apic_ops.apic_write_atomic, reg, v);
772 static inline u32 apic_read(unsigned long reg)
774 return PVOP_CALL1(unsigned long, pv_apic_ops.apic_read, reg);
777 static inline void setup_boot_clock(void)
779 PVOP_VCALL0(pv_apic_ops.setup_boot_clock);
782 static inline void setup_secondary_clock(void)
784 PVOP_VCALL0(pv_apic_ops.setup_secondary_clock);
788 static inline void paravirt_post_allocator_init(void)
790 if (pv_init_ops.post_allocator_init)
791 (*pv_init_ops.post_allocator_init)();
794 static inline void paravirt_pagetable_setup_start(pgd_t *base)
796 (*pv_mmu_ops.pagetable_setup_start)(base);
799 static inline void paravirt_pagetable_setup_done(pgd_t *base)
801 (*pv_mmu_ops.pagetable_setup_done)(base);
805 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
806 unsigned long start_esp)
808 PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
809 phys_apicid, start_eip, start_esp);
813 static inline void paravirt_activate_mm(struct mm_struct *prev,
814 struct mm_struct *next)
816 PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
819 static inline void arch_dup_mmap(struct mm_struct *oldmm,
820 struct mm_struct *mm)
822 PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
825 static inline void arch_exit_mmap(struct mm_struct *mm)
827 PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
830 static inline void __flush_tlb(void)
832 PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
834 static inline void __flush_tlb_global(void)
836 PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
838 static inline void __flush_tlb_single(unsigned long addr)
840 PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
843 static inline void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
846 PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, &cpumask, mm, va);
849 static inline void paravirt_alloc_pt(struct mm_struct *mm, unsigned pfn)
851 PVOP_VCALL2(pv_mmu_ops.alloc_pt, mm, pfn);
853 static inline void paravirt_release_pt(unsigned pfn)
855 PVOP_VCALL1(pv_mmu_ops.release_pt, pfn);
858 static inline void paravirt_alloc_pd(unsigned pfn)
860 PVOP_VCALL1(pv_mmu_ops.alloc_pd, pfn);
863 static inline void paravirt_alloc_pd_clone(unsigned pfn, unsigned clonepfn,
864 unsigned start, unsigned count)
866 PVOP_VCALL4(pv_mmu_ops.alloc_pd_clone, pfn, clonepfn, start, count);
868 static inline void paravirt_release_pd(unsigned pfn)
870 PVOP_VCALL1(pv_mmu_ops.release_pd, pfn);
873 #ifdef CONFIG_HIGHPTE
874 static inline void *kmap_atomic_pte(struct page *page, enum km_type type)
877 ret = PVOP_CALL2(unsigned long, pv_mmu_ops.kmap_atomic_pte, page, type);
882 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
885 PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
888 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
891 PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
894 #ifdef CONFIG_X86_PAE
895 static inline pte_t __pte(unsigned long long val)
897 unsigned long long ret = PVOP_CALL2(unsigned long long,
900 return (pte_t) { ret, ret >> 32 };
903 static inline pmd_t __pmd(unsigned long long val)
905 return (pmd_t) { PVOP_CALL2(unsigned long long, pv_mmu_ops.make_pmd,
909 static inline pgd_t __pgd(unsigned long long val)
911 return (pgd_t) { PVOP_CALL2(unsigned long long, pv_mmu_ops.make_pgd,
915 static inline unsigned long long pte_val(pte_t x)
917 return PVOP_CALL2(unsigned long long, pv_mmu_ops.pte_val,
918 x.pte_low, x.pte_high);
921 static inline unsigned long long pmd_val(pmd_t x)
923 return PVOP_CALL2(unsigned long long, pv_mmu_ops.pmd_val,
927 static inline unsigned long long pgd_val(pgd_t x)
929 return PVOP_CALL2(unsigned long long, pv_mmu_ops.pgd_val,
933 static inline void set_pte(pte_t *ptep, pte_t pteval)
935 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep, pteval.pte_low, pteval.pte_high);
938 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
939 pte_t *ptep, pte_t pteval)
942 pv_mmu_ops.set_pte_at(mm, addr, ptep, pteval);
945 static inline void set_pte_atomic(pte_t *ptep, pte_t pteval)
947 PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
948 pteval.pte_low, pteval.pte_high);
951 static inline void set_pte_present(struct mm_struct *mm, unsigned long addr,
952 pte_t *ptep, pte_t pte)
955 pv_mmu_ops.set_pte_present(mm, addr, ptep, pte);
958 static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
960 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp,
961 pmdval.pmd, pmdval.pmd >> 32);
964 static inline void set_pud(pud_t *pudp, pud_t pudval)
966 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
967 pudval.pgd.pgd, pudval.pgd.pgd >> 32);
970 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
972 PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
975 static inline void pmd_clear(pmd_t *pmdp)
977 PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
980 #else /* !CONFIG_X86_PAE */
982 static inline pte_t __pte(unsigned long val)
984 return (pte_t) { PVOP_CALL1(unsigned long, pv_mmu_ops.make_pte, val) };
987 static inline pgd_t __pgd(unsigned long val)
989 return (pgd_t) { PVOP_CALL1(unsigned long, pv_mmu_ops.make_pgd, val) };
992 static inline unsigned long pte_val(pte_t x)
994 return PVOP_CALL1(unsigned long, pv_mmu_ops.pte_val, x.pte_low);
997 static inline unsigned long pgd_val(pgd_t x)
999 return PVOP_CALL1(unsigned long, pv_mmu_ops.pgd_val, x.pgd);
1002 static inline void set_pte(pte_t *ptep, pte_t pteval)
1004 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep, pteval.pte_low);
1007 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
1008 pte_t *ptep, pte_t pteval)
1010 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pteval.pte_low);
1013 static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
1015 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, pmdval.pud.pgd.pgd);
1017 #endif /* CONFIG_X86_PAE */
1019 /* Lazy mode for batching updates / context switch */
1020 enum paravirt_lazy_mode {
1026 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
1027 void paravirt_enter_lazy_cpu(void);
1028 void paravirt_leave_lazy_cpu(void);
1029 void paravirt_enter_lazy_mmu(void);
1030 void paravirt_leave_lazy_mmu(void);
1031 void paravirt_leave_lazy(enum paravirt_lazy_mode mode);
1033 #define __HAVE_ARCH_ENTER_LAZY_CPU_MODE
1034 static inline void arch_enter_lazy_cpu_mode(void)
1036 PVOP_VCALL0(pv_cpu_ops.lazy_mode.enter);
1039 static inline void arch_leave_lazy_cpu_mode(void)
1041 PVOP_VCALL0(pv_cpu_ops.lazy_mode.leave);
1044 static inline void arch_flush_lazy_cpu_mode(void)
1046 if (unlikely(paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU)) {
1047 arch_leave_lazy_cpu_mode();
1048 arch_enter_lazy_cpu_mode();
1053 #define __HAVE_ARCH_ENTER_LAZY_MMU_MODE
1054 static inline void arch_enter_lazy_mmu_mode(void)
1056 PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
1059 static inline void arch_leave_lazy_mmu_mode(void)
1061 PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
1064 static inline void arch_flush_lazy_mmu_mode(void)
1066 if (unlikely(paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU)) {
1067 arch_leave_lazy_mmu_mode();
1068 arch_enter_lazy_mmu_mode();
1072 void _paravirt_nop(void);
1073 #define paravirt_nop ((void *)_paravirt_nop)
1075 /* These all sit in the .parainstructions section to tell us what to patch. */
1076 struct paravirt_patch_site {
1077 u8 *instr; /* original instructions */
1078 u8 instrtype; /* type of this instruction */
1079 u8 len; /* length of original instruction */
1080 u16 clobbers; /* what registers you may clobber */
1083 extern struct paravirt_patch_site __parainstructions[],
1084 __parainstructions_end[];
1086 static inline unsigned long __raw_local_save_flags(void)
1090 asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1092 "popl %%edx; popl %%ecx")
1094 : paravirt_type(pv_irq_ops.save_fl),
1095 paravirt_clobber(CLBR_EAX)
1100 static inline void raw_local_irq_restore(unsigned long f)
1102 asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1104 "popl %%edx; popl %%ecx")
1107 paravirt_type(pv_irq_ops.restore_fl),
1108 paravirt_clobber(CLBR_EAX)
1112 static inline void raw_local_irq_disable(void)
1114 asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1116 "popl %%edx; popl %%ecx")
1118 : paravirt_type(pv_irq_ops.irq_disable),
1119 paravirt_clobber(CLBR_EAX)
1120 : "memory", "eax", "cc");
1123 static inline void raw_local_irq_enable(void)
1125 asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1127 "popl %%edx; popl %%ecx")
1129 : paravirt_type(pv_irq_ops.irq_enable),
1130 paravirt_clobber(CLBR_EAX)
1131 : "memory", "eax", "cc");
1134 static inline unsigned long __raw_local_irq_save(void)
1138 f = __raw_local_save_flags();
1139 raw_local_irq_disable();
1143 /* Make sure as little as possible of this mess escapes. */
1144 #undef PARAVIRT_CALL
1158 #else /* __ASSEMBLY__ */
1160 #define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 4)
1162 #define PARA_SITE(ptype, clobbers, ops) \
1166 .pushsection .parainstructions,"a"; \
1173 #define INTERRUPT_RETURN \
1174 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE, \
1175 jmp *%cs:pv_cpu_ops+PV_CPU_iret)
1177 #define DISABLE_INTERRUPTS(clobbers) \
1178 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
1179 pushl %eax; pushl %ecx; pushl %edx; \
1180 call *%cs:pv_irq_ops+PV_IRQ_irq_disable; \
1181 popl %edx; popl %ecx; popl %eax) \
1183 #define ENABLE_INTERRUPTS(clobbers) \
1184 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers, \
1185 pushl %eax; pushl %ecx; pushl %edx; \
1186 call *%cs:pv_irq_ops+PV_IRQ_irq_enable; \
1187 popl %edx; popl %ecx; popl %eax)
1189 #define ENABLE_INTERRUPTS_SYSCALL_RET \
1190 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_syscall_ret),\
1192 jmp *%cs:pv_cpu_ops+PV_CPU_irq_enable_syscall_ret)
1194 #define GET_CR0_INTO_EAX \
1195 push %ecx; push %edx; \
1196 call *pv_cpu_ops+PV_CPU_read_cr0; \
1199 #endif /* __ASSEMBLY__ */
1200 #endif /* CONFIG_PARAVIRT */
1201 #endif /* __ASM_PARAVIRT_H */