506 строки
14 KiB
C
506 строки
14 KiB
C
#ifndef __ASM_PARAVIRT_H
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#define __ASM_PARAVIRT_H
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/* Various instructions on x86 need to be replaced for
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* para-virtualization: those hooks are defined here. */
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#include <linux/linkage.h>
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#include <linux/stringify.h>
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#include <asm/page.h>
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#ifdef CONFIG_PARAVIRT
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/* These are the most performance critical ops, so we want to be able to patch
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* callers */
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#define PARAVIRT_IRQ_DISABLE 0
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#define PARAVIRT_IRQ_ENABLE 1
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#define PARAVIRT_RESTORE_FLAGS 2
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#define PARAVIRT_SAVE_FLAGS 3
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#define PARAVIRT_SAVE_FLAGS_IRQ_DISABLE 4
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#define PARAVIRT_INTERRUPT_RETURN 5
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#define PARAVIRT_STI_SYSEXIT 6
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/* Bitmask of what can be clobbered: usually at least eax. */
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#define CLBR_NONE 0x0
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#define CLBR_EAX 0x1
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#define CLBR_ECX 0x2
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#define CLBR_EDX 0x4
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#define CLBR_ANY 0x7
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#ifndef __ASSEMBLY__
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struct thread_struct;
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struct Xgt_desc_struct;
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struct tss_struct;
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struct mm_struct;
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struct paravirt_ops
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{
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unsigned int kernel_rpl;
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int paravirt_enabled;
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const char *name;
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/*
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* Patch may replace one of the defined code sequences with arbitrary
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* code, subject to the same register constraints. This generally
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* means the code is not free to clobber any registers other than EAX.
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* The patch function should return the number of bytes of code
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* generated, as we nop pad the rest in generic code.
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*/
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unsigned (*patch)(u8 type, u16 clobber, void *firstinsn, unsigned len);
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void (*arch_setup)(void);
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char *(*memory_setup)(void);
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void (*init_IRQ)(void);
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void (*banner)(void);
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unsigned long (*get_wallclock)(void);
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int (*set_wallclock)(unsigned long);
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void (*time_init)(void);
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/* All the function pointers here are declared as "fastcall"
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so that we get a specific register-based calling
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convention. This makes it easier to implement inline
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assembler replacements. */
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void (fastcall *cpuid)(unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx);
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unsigned long (fastcall *get_debugreg)(int regno);
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void (fastcall *set_debugreg)(int regno, unsigned long value);
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void (fastcall *clts)(void);
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unsigned long (fastcall *read_cr0)(void);
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void (fastcall *write_cr0)(unsigned long);
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unsigned long (fastcall *read_cr2)(void);
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void (fastcall *write_cr2)(unsigned long);
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unsigned long (fastcall *read_cr3)(void);
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void (fastcall *write_cr3)(unsigned long);
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unsigned long (fastcall *read_cr4_safe)(void);
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unsigned long (fastcall *read_cr4)(void);
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void (fastcall *write_cr4)(unsigned long);
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unsigned long (fastcall *save_fl)(void);
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void (fastcall *restore_fl)(unsigned long);
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void (fastcall *irq_disable)(void);
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void (fastcall *irq_enable)(void);
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void (fastcall *safe_halt)(void);
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void (fastcall *halt)(void);
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void (fastcall *wbinvd)(void);
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/* err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
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u64 (fastcall *read_msr)(unsigned int msr, int *err);
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int (fastcall *write_msr)(unsigned int msr, u64 val);
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u64 (fastcall *read_tsc)(void);
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u64 (fastcall *read_pmc)(void);
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void (fastcall *load_tr_desc)(void);
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void (fastcall *load_gdt)(const struct Xgt_desc_struct *);
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void (fastcall *load_idt)(const struct Xgt_desc_struct *);
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void (fastcall *store_gdt)(struct Xgt_desc_struct *);
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void (fastcall *store_idt)(struct Xgt_desc_struct *);
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void (fastcall *set_ldt)(const void *desc, unsigned entries);
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unsigned long (fastcall *store_tr)(void);
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void (fastcall *load_tls)(struct thread_struct *t, unsigned int cpu);
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void (fastcall *write_ldt_entry)(void *dt, int entrynum,
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u32 low, u32 high);
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void (fastcall *write_gdt_entry)(void *dt, int entrynum,
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u32 low, u32 high);
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void (fastcall *write_idt_entry)(void *dt, int entrynum,
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u32 low, u32 high);
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void (fastcall *load_esp0)(struct tss_struct *tss,
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struct thread_struct *thread);
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void (fastcall *set_iopl_mask)(unsigned mask);
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void (fastcall *io_delay)(void);
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void (*const_udelay)(unsigned long loops);
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#ifdef CONFIG_X86_LOCAL_APIC
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void (fastcall *apic_write)(unsigned long reg, unsigned long v);
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void (fastcall *apic_write_atomic)(unsigned long reg, unsigned long v);
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unsigned long (fastcall *apic_read)(unsigned long reg);
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#endif
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void (fastcall *flush_tlb_user)(void);
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void (fastcall *flush_tlb_kernel)(void);
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void (fastcall *flush_tlb_single)(u32 addr);
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void (fastcall *set_pte)(pte_t *ptep, pte_t pteval);
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void (fastcall *set_pte_at)(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pteval);
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void (fastcall *set_pmd)(pmd_t *pmdp, pmd_t pmdval);
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void (fastcall *pte_update)(struct mm_struct *mm, u32 addr, pte_t *ptep);
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void (fastcall *pte_update_defer)(struct mm_struct *mm, u32 addr, pte_t *ptep);
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#ifdef CONFIG_X86_PAE
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void (fastcall *set_pte_atomic)(pte_t *ptep, pte_t pteval);
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void (fastcall *set_pte_present)(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte);
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void (fastcall *set_pud)(pud_t *pudp, pud_t pudval);
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void (fastcall *pte_clear)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
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void (fastcall *pmd_clear)(pmd_t *pmdp);
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#endif
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/* These two are jmp to, not actually called. */
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void (fastcall *irq_enable_sysexit)(void);
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void (fastcall *iret)(void);
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};
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/* Mark a paravirt probe function. */
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#define paravirt_probe(fn) \
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static asmlinkage void (*__paravirtprobe_##fn)(void) __attribute_used__ \
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__attribute__((__section__(".paravirtprobe"))) = fn
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extern struct paravirt_ops paravirt_ops;
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#define paravirt_enabled() (paravirt_ops.paravirt_enabled)
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static inline void load_esp0(struct tss_struct *tss,
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struct thread_struct *thread)
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{
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paravirt_ops.load_esp0(tss, thread);
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}
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#define ARCH_SETUP paravirt_ops.arch_setup();
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static inline unsigned long get_wallclock(void)
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{
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return paravirt_ops.get_wallclock();
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}
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static inline int set_wallclock(unsigned long nowtime)
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{
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return paravirt_ops.set_wallclock(nowtime);
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}
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static inline void do_time_init(void)
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{
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return paravirt_ops.time_init();
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}
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/* The paravirtualized CPUID instruction. */
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static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx)
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{
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paravirt_ops.cpuid(eax, ebx, ecx, edx);
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}
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/*
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* These special macros can be used to get or set a debugging register
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*/
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#define get_debugreg(var, reg) var = paravirt_ops.get_debugreg(reg)
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#define set_debugreg(val, reg) paravirt_ops.set_debugreg(reg, val)
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#define clts() paravirt_ops.clts()
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#define read_cr0() paravirt_ops.read_cr0()
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#define write_cr0(x) paravirt_ops.write_cr0(x)
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#define read_cr2() paravirt_ops.read_cr2()
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#define write_cr2(x) paravirt_ops.write_cr2(x)
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#define read_cr3() paravirt_ops.read_cr3()
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#define write_cr3(x) paravirt_ops.write_cr3(x)
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#define read_cr4() paravirt_ops.read_cr4()
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#define read_cr4_safe(x) paravirt_ops.read_cr4_safe()
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#define write_cr4(x) paravirt_ops.write_cr4(x)
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static inline void raw_safe_halt(void)
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{
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paravirt_ops.safe_halt();
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}
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static inline void halt(void)
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{
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paravirt_ops.safe_halt();
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}
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#define wbinvd() paravirt_ops.wbinvd()
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#define get_kernel_rpl() (paravirt_ops.kernel_rpl)
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#define rdmsr(msr,val1,val2) do { \
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int _err; \
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u64 _l = paravirt_ops.read_msr(msr,&_err); \
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val1 = (u32)_l; \
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val2 = _l >> 32; \
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} while(0)
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#define wrmsr(msr,val1,val2) do { \
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u64 _l = ((u64)(val2) << 32) | (val1); \
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paravirt_ops.write_msr((msr), _l); \
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} while(0)
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#define rdmsrl(msr,val) do { \
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int _err; \
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val = paravirt_ops.read_msr((msr),&_err); \
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} while(0)
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#define wrmsrl(msr,val) (paravirt_ops.write_msr((msr),(val)))
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#define wrmsr_safe(msr,a,b) ({ \
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u64 _l = ((u64)(b) << 32) | (a); \
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paravirt_ops.write_msr((msr),_l); \
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})
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/* rdmsr with exception handling */
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#define rdmsr_safe(msr,a,b) ({ \
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int _err; \
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u64 _l = paravirt_ops.read_msr(msr,&_err); \
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(*a) = (u32)_l; \
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(*b) = _l >> 32; \
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_err; })
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#define rdtsc(low,high) do { \
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u64 _l = paravirt_ops.read_tsc(); \
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low = (u32)_l; \
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high = _l >> 32; \
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} while(0)
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#define rdtscl(low) do { \
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u64 _l = paravirt_ops.read_tsc(); \
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low = (int)_l; \
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} while(0)
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#define rdtscll(val) (val = paravirt_ops.read_tsc())
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#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
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#define rdpmc(counter,low,high) do { \
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u64 _l = paravirt_ops.read_pmc(); \
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low = (u32)_l; \
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high = _l >> 32; \
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} while(0)
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#define load_TR_desc() (paravirt_ops.load_tr_desc())
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#define load_gdt(dtr) (paravirt_ops.load_gdt(dtr))
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#define load_idt(dtr) (paravirt_ops.load_idt(dtr))
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#define set_ldt(addr, entries) (paravirt_ops.set_ldt((addr), (entries)))
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#define store_gdt(dtr) (paravirt_ops.store_gdt(dtr))
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#define store_idt(dtr) (paravirt_ops.store_idt(dtr))
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#define store_tr(tr) ((tr) = paravirt_ops.store_tr())
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#define load_TLS(t,cpu) (paravirt_ops.load_tls((t),(cpu)))
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#define write_ldt_entry(dt, entry, low, high) \
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(paravirt_ops.write_ldt_entry((dt), (entry), (low), (high)))
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#define write_gdt_entry(dt, entry, low, high) \
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(paravirt_ops.write_gdt_entry((dt), (entry), (low), (high)))
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#define write_idt_entry(dt, entry, low, high) \
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(paravirt_ops.write_idt_entry((dt), (entry), (low), (high)))
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#define set_iopl_mask(mask) (paravirt_ops.set_iopl_mask(mask))
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/* The paravirtualized I/O functions */
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static inline void slow_down_io(void) {
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paravirt_ops.io_delay();
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#ifdef REALLY_SLOW_IO
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paravirt_ops.io_delay();
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paravirt_ops.io_delay();
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paravirt_ops.io_delay();
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#endif
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}
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#ifdef CONFIG_X86_LOCAL_APIC
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/*
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* Basic functions accessing APICs.
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*/
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static inline void apic_write(unsigned long reg, unsigned long v)
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{
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paravirt_ops.apic_write(reg,v);
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}
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static inline void apic_write_atomic(unsigned long reg, unsigned long v)
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{
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paravirt_ops.apic_write_atomic(reg,v);
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}
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static inline unsigned long apic_read(unsigned long reg)
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{
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return paravirt_ops.apic_read(reg);
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}
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#endif
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#define __flush_tlb() paravirt_ops.flush_tlb_user()
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#define __flush_tlb_global() paravirt_ops.flush_tlb_kernel()
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#define __flush_tlb_single(addr) paravirt_ops.flush_tlb_single(addr)
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static inline void set_pte(pte_t *ptep, pte_t pteval)
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{
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paravirt_ops.set_pte(ptep, pteval);
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}
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static inline void set_pte_at(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pteval)
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{
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paravirt_ops.set_pte_at(mm, addr, ptep, pteval);
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}
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static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
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{
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paravirt_ops.set_pmd(pmdp, pmdval);
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}
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static inline void pte_update(struct mm_struct *mm, u32 addr, pte_t *ptep)
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{
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paravirt_ops.pte_update(mm, addr, ptep);
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}
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static inline void pte_update_defer(struct mm_struct *mm, u32 addr, pte_t *ptep)
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{
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paravirt_ops.pte_update_defer(mm, addr, ptep);
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}
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#ifdef CONFIG_X86_PAE
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static inline void set_pte_atomic(pte_t *ptep, pte_t pteval)
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{
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paravirt_ops.set_pte_atomic(ptep, pteval);
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}
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static inline void set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
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{
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paravirt_ops.set_pte_present(mm, addr, ptep, pte);
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}
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static inline void set_pud(pud_t *pudp, pud_t pudval)
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{
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paravirt_ops.set_pud(pudp, pudval);
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}
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static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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{
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paravirt_ops.pte_clear(mm, addr, ptep);
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}
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static inline void pmd_clear(pmd_t *pmdp)
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{
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paravirt_ops.pmd_clear(pmdp);
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}
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#endif
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/* These all sit in the .parainstructions section to tell us what to patch. */
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struct paravirt_patch {
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u8 *instr; /* original instructions */
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u8 instrtype; /* type of this instruction */
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u8 len; /* length of original instruction */
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u16 clobbers; /* what registers you may clobber */
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};
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#define paravirt_alt(insn_string, typenum, clobber) \
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"771:\n\t" insn_string "\n" "772:\n" \
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".pushsection .parainstructions,\"a\"\n" \
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" .long 771b\n" \
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" .byte " __stringify(typenum) "\n" \
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" .byte 772b-771b\n" \
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" .short " __stringify(clobber) "\n" \
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".popsection"
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static inline unsigned long __raw_local_save_flags(void)
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{
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unsigned long f;
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__asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
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"call *%1;"
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"popl %%edx; popl %%ecx",
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PARAVIRT_SAVE_FLAGS, CLBR_NONE)
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: "=a"(f): "m"(paravirt_ops.save_fl)
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: "memory", "cc");
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return f;
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}
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static inline void raw_local_irq_restore(unsigned long f)
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{
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__asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
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"call *%1;"
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"popl %%edx; popl %%ecx",
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PARAVIRT_RESTORE_FLAGS, CLBR_EAX)
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: "=a"(f) : "m" (paravirt_ops.restore_fl), "0"(f)
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: "memory", "cc");
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}
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static inline void raw_local_irq_disable(void)
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{
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__asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
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"call *%0;"
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"popl %%edx; popl %%ecx",
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PARAVIRT_IRQ_DISABLE, CLBR_EAX)
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: : "m" (paravirt_ops.irq_disable)
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: "memory", "eax", "cc");
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}
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static inline void raw_local_irq_enable(void)
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{
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__asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
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"call *%0;"
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"popl %%edx; popl %%ecx",
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PARAVIRT_IRQ_ENABLE, CLBR_EAX)
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: : "m" (paravirt_ops.irq_enable)
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: "memory", "eax", "cc");
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}
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static inline unsigned long __raw_local_irq_save(void)
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{
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unsigned long f;
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__asm__ __volatile__(paravirt_alt( "pushl %%ecx; pushl %%edx;"
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"call *%1; pushl %%eax;"
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"call *%2; popl %%eax;"
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"popl %%edx; popl %%ecx",
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PARAVIRT_SAVE_FLAGS_IRQ_DISABLE,
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CLBR_NONE)
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: "=a"(f)
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: "m" (paravirt_ops.save_fl),
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"m" (paravirt_ops.irq_disable)
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: "memory", "cc");
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return f;
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}
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#define CLI_STRING paravirt_alt("pushl %%ecx; pushl %%edx;" \
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"call *paravirt_ops+%c[irq_disable];" \
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"popl %%edx; popl %%ecx", \
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PARAVIRT_IRQ_DISABLE, CLBR_EAX)
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#define STI_STRING paravirt_alt("pushl %%ecx; pushl %%edx;" \
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"call *paravirt_ops+%c[irq_enable];" \
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"popl %%edx; popl %%ecx", \
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PARAVIRT_IRQ_ENABLE, CLBR_EAX)
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#define CLI_STI_CLOBBERS , "%eax"
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#define CLI_STI_INPUT_ARGS \
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, \
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[irq_disable] "i" (offsetof(struct paravirt_ops, irq_disable)), \
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[irq_enable] "i" (offsetof(struct paravirt_ops, irq_enable))
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#else /* __ASSEMBLY__ */
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#define PARA_PATCH(ptype, clobbers, ops) \
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771:; \
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ops; \
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772:; \
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.pushsection .parainstructions,"a"; \
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.long 771b; \
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.byte ptype; \
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.byte 772b-771b; \
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.short clobbers; \
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.popsection
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#define INTERRUPT_RETURN \
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PARA_PATCH(PARAVIRT_INTERRUPT_RETURN, CLBR_ANY, \
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jmp *%cs:paravirt_ops+PARAVIRT_iret)
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#define DISABLE_INTERRUPTS(clobbers) \
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PARA_PATCH(PARAVIRT_IRQ_DISABLE, clobbers, \
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pushl %ecx; pushl %edx; \
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call *paravirt_ops+PARAVIRT_irq_disable; \
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popl %edx; popl %ecx) \
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#define ENABLE_INTERRUPTS(clobbers) \
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PARA_PATCH(PARAVIRT_IRQ_ENABLE, clobbers, \
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pushl %ecx; pushl %edx; \
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call *%cs:paravirt_ops+PARAVIRT_irq_enable; \
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popl %edx; popl %ecx)
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#define ENABLE_INTERRUPTS_SYSEXIT \
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PARA_PATCH(PARAVIRT_STI_SYSEXIT, CLBR_ANY, \
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jmp *%cs:paravirt_ops+PARAVIRT_irq_enable_sysexit)
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#define GET_CR0_INTO_EAX \
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call *paravirt_ops+PARAVIRT_read_cr0
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_PARAVIRT */
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#endif /* __ASM_PARAVIRT_H */
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