#ifndef __ASM_PARAVIRT_H
#define __ASM_PARAVIRT_H
/* Various instructions on x86 need to be replaced for
* para-virtualization: those hooks are defined here. */
#ifdef CONFIG_PARAVIRT
#include <asm/page.h>
/* Bitmask of what can be clobbered: usually at least eax. */
#define CLBR_NONE 0x0
#define CLBR_EAX 0x1
#define CLBR_ECX 0x2
#define CLBR_EDX 0x4
#define CLBR_ANY 0x7
#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <linux/cpumask.h>
#include <asm/kmap_types.h>
struct page;
struct thread_struct;
struct Xgt_desc_struct;
struct tss_struct;
struct mm_struct;
struct desc_struct;
/* Lazy mode for batching updates / context switch */
enum paravirt_lazy_mode {
PARAVIRT_LAZY_NONE = 0,
PARAVIRT_LAZY_MMU = 1,
PARAVIRT_LAZY_CPU = 2,
PARAVIRT_LAZY_FLUSH = 3,
};
struct paravirt_ops
{
unsigned int kernel_rpl;
int shared_kernel_pmd;
int paravirt_enabled;
const char *name;
/*
* Patch may replace one of the defined code sequences with arbitrary
* code, subject to the same register constraints. This generally
* means the code is not free to clobber any registers other than EAX.
* The patch function should return the number of bytes of code
* generated, as we nop pad the rest in generic code.
*/
unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
unsigned long addr, unsigned len);
/* Basic arch-specific setup */
void (*arch_setup)(void);
char *(*memory_setup)(void);
void (*post_allocator_init)(void);
void (*init_IRQ)(void);
void (*time_init)(void);
/*
* Called before/after init_mm pagetable setup. setup_start
* may reset %cr3, and may pre-install parts of the pagetable;
* pagetable setup is expected to preserve any existing
* mapping.
*/
void (*pagetable_setup_start)(pgd_t *pgd_base);
void (*pagetable_setup_done)(pgd_t *pgd_base);
/* Print a banner to identify the environment */
void (*banner)(void);
/* Set and set time of day */
unsigned long (*get_wallclock)(void);
int (*set_wallclock)(unsigned long);
/* cpuid emulation, mostly so that caps bits can be disabled */
void (*cpuid)(unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx);
/* hooks for various privileged instructions */
unsigned long (*get_debugreg)(int regno);
void (*set_debugreg)(int regno, unsigned long value);
void (*clts)(void);
unsigned long (*read_cr0)(void);
void (*write_cr0)(unsigned long);
unsigned long (*read_cr2)(void);
void (*write_cr2)(unsigned long);
unsigned long (*read_cr3)(void);
void (*write_cr3)(unsigned long);
unsigned long (*read_cr4_safe)(void);
unsigned long (*read_cr4)(void);
void (*write_cr4)(unsigned long);
/*
* Get/set interrupt state. save_fl and restore_fl are only
* expected to use X86_EFLAGS_IF; all other bits
* returned from save_fl are undefined, and may be ignored by
* restore_fl.
*/
unsigned long (*save_fl)(void);
void (*restore_fl)(unsigned long);
void (*irq_disable)(void);
void (*irq_enable)(void);
void (*safe_halt)(void);
void (*halt)(void);
void (*wbinvd)(void);
/* MSR, PMC and TSR operations.
err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
u64 (*read_msr)(unsigned int msr, int *err);
int (*write_msr)(unsigned int msr, u64 val);
u64 (*read_tsc)(void);
u64 (*read_pmc)(void);
unsigned long long (*sched_clock)(void);
unsigned long (*get_cpu_khz)(void);
/* Segment descriptor handling */
void (*load_tr_desc)(void);
void (*load_gdt)(const struct Xgt_desc_struct *);
void (*load_idt)(const struct Xgt_desc_struct *);
void (*store_gdt)(struct Xgt_desc_struct *);
void (*store_idt)(struct Xgt_desc_struct *);
void (*set_ldt)(const void *desc, unsigned entries);
unsigned long