paravirt.h

#ifdef CONFIG_X86_PAE
/* Special-case pte-setting operations for PAE, which can't update a
   64-bit pte atomically */
static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
{
	PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
		    pte.pte, pte.pte >> 32);
}

static inline void set_pte_present(struct mm_struct *mm, unsigned long addr,
				   pte_t *ptep, pte_t pte)
{
	/* 5 arg words */
	pv_mmu_ops.set_pte_present(mm, addr, ptep, pte);
}

static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
			     pte_t *ptep)
{
	PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
}
#else  /* !CONFIG_X86_PAE */
static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
{
	set_pte(ptep, pte);
}

static inline void set_pte_present(struct mm_struct *mm, unsigned long addr,
				   pte_t *ptep, pte_t pte)
{
	set_pte(ptep, pte);
}

static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
			     pte_t *ptep)
{
	set_pte_at(mm, addr, ptep, __pte(0));
}
#endif	/* CONFIG_X86_PAE */

#if PAGETABLE_LEVELS >= 3
static inline pmd_t __pmd(pmdval_t val)
{
	pmdval_t ret;

	if (sizeof(pmdval_t) > sizeof(long))
		ret = PVOP_CALL2(pmdval_t, pv_mmu_ops.make_pmd,
				 val, (u64)val >> 32);
	else
		ret = PVOP_CALL1(pmdval_t, pv_mmu_ops.make_pmd,
				 val);

	return (pmd_t) { ret };
}

static inline pmdval_t pmd_val(pmd_t pmd)
{
	pmdval_t ret;

	if (sizeof(pmdval_t) > sizeof(long))
		ret =  PVOP_CALL2(pmdval_t, pv_mmu_ops.pmd_val,
				  pmd.pmd, (u64)pmd.pmd >> 32);
	else
		ret =  PVOP_CALL1(pmdval_t, pv_mmu_ops.pmd_val,
				  pmd.pmd);

	return ret;
}
#endif	/* PAGETABLE_LEVELS >= 3 */

#ifdef CONFIG_X86_PAE

static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
{
	PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp,
		    pmdval.pmd, pmdval.pmd >> 32);
}

static inline void set_pud(pud_t *pudp, pud_t pudval)
{
	PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
		    pudval.pgd.pgd, pudval.pgd.pgd >> 32);
}

static inline void pmd_clear(pmd_t *pmdp)
{
	PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
}

#else  /* !CONFIG_X86_PAE */

static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
{
	PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, pmdval.pud.pgd.pgd);
}

static inline void pmd_clear(pmd_t *pmdp)
{
	set_pmd(pmdp, __pmd(0));
}

#endif	/* CONFIG_X86_PAE */

/* Lazy mode for batching updates / context switch */
enum paravirt_lazy_mode {
	PARAVIRT_LAZY_NONE,
	PARAVIRT_LAZY_MMU,
	PARAVIRT_LAZY_CPU,
};

enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
void paravirt_enter_lazy_cpu(void);
void paravirt_leave_lazy_cpu(void);
void paravirt_enter_lazy_mmu(void);
void paravirt_leave_lazy_mmu(void);
void paravirt_leave_lazy(enum paravirt_lazy_mode mode);

#define  __HAVE_ARCH_ENTER_LAZY_CPU_MODE
static inline void arch_enter_lazy_cpu_mode(void)
{
	PVOP_VCALL0(pv_cpu_ops.lazy_mode.enter);
}

static inline void arch_leave_lazy_cpu_mode(void)
{
	PVOP_VCALL0(pv_cpu_ops.lazy_mode.leave);
}

static inline void arch_flush_lazy_cpu_mode(void)
{
	if (unlikely(paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU)) {
		arch_leave_lazy_cpu_mode();
		arch_enter_lazy_cpu_mode();
	}
}


#define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
static inline void arch_enter_lazy_mmu_mode(void)
{
	PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
}

static inline void arch_leave_lazy_mmu_mode(void)
{
	PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
}

static inline void arch_flush_lazy_mmu_mode(void)
{
	if (unlikely(paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU)) {
		arch_leave_lazy_mmu_mode();
		arch_enter_lazy_mmu_mode();
	}
}

void _paravirt_nop(void);
#define paravirt_nop	((void *)_paravirt_nop)

/* These all sit in the .parainstructions section to tell us what to patch. */
struct paravirt_patch_site {
	u8 *instr; 		/* original instructions */
	u8 instrtype;		/* type of this instruction */
	u8 len;			/* length of original instruction */
	u16 clobbers;		/* what registers you may clobber */
};

extern struct paravirt_patch_site __parainstructions[],
	__parainstructions_end[];

#ifdef CONFIG_X86_32
#define PV_SAVE_REGS "pushl %%ecx; pushl %%edx;"
#define PV_RESTORE_REGS "popl %%edx; popl %%ecx"
#define PV_FLAGS_ARG "0"
#define PV_EXTRA_CLOBBERS
#define PV_VEXTRA_CLOBBERS
#else
/* We save some registers, but all of them, that's too much. We clobber all
 * caller saved registers but the argument parameter */
#define PV_SAVE_REGS "pushq %%rdi;"
#define PV_RESTORE_REGS "popq %%rdi;"
#define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx"
#define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx"
#define PV_FLAGS_ARG "D"
#endif

static inline unsigned long __raw_local_save_flags(void)
{
	unsigned long f;

	asm volatile(paravirt_alt(PV_SAVE_REGS
				  PARAVIRT_CALL
				  PV_RESTORE_REGS)
		     : "=a"(f)
		     : paravirt_type(pv_irq_ops.save_fl),
		       paravirt_clobber(CLBR_EAX)
		     : "memory", "cc" PV_VEXTRA_CLOBBERS);
	return f;
}

static inline void raw_local_irq_restore(unsigned long f)
{
	asm volatile(paravirt_alt(PV_SAVE_REGS
				  PARAVIRT_CALL
				  PV_RESTORE_REGS)
		     : "=a"(f)
		     : PV_FLAGS_ARG(f),
		       paravirt_type(pv_irq_ops.restore_fl),
		       paravirt_clobber(CLBR_EAX)
		     : "memory", "cc" PV_EXTRA_CLOBBERS);
}

static inline void raw_local_irq_disable(void)
{
	asm volatile(paravirt_alt(PV_SAVE_REGS
				  PARAVIRT_CALL
				  PV_RESTORE_REGS)
		     :
		     : paravirt_type(pv_irq_ops.irq_disable),
		       paravirt_clobber(CLBR_EAX)
		     : "memory", "eax", "cc" PV_EXTRA_CLOBBERS);
}

static inline void raw_local_irq_enable(void)
{
	asm volatile(paravirt_alt(PV_SAVE_REGS
				  PARAVIRT_CALL
				  PV_RESTORE_REGS)
		     :
		     : paravirt_type(pv_irq_ops.irq_enable),
		       paravirt_clobber(CLBR_EAX)
		     : "memory", "eax", "cc" PV_EXTRA_CLOBBERS);
}

static inline unsigned long __raw_local_irq_save(void)
{
	unsigned long f;

	f = __raw_local_save_flags();
	raw_local_irq_disable();
	return f;
}

/* Make sure as little as possible of this mess escapes. */
#undef PARAVIRT_CALL
#undef __PVOP_CALL
#undef __PVOP_VCALL
#undef PVOP_VCALL0
#undef PVOP_CALL0
#undef PVOP_VCALL1
#undef PVOP_CALL1
#undef PVOP_VCALL2
#undef PVOP_CALL2
#undef PVOP_VCALL3
#undef PVOP_CALL3
#undef PVOP_VCALL4
#undef PVOP_CALL4

#else  /* __ASSEMBLY__ */

#define _PVSITE(ptype, clobbers, ops, word, algn)	\
771:;						\
	ops;					\
772:;						\
	.pushsection .parainstructions,"a";	\
	 .align	algn;				\
	 word 771b;				\
	 .byte ptype;				\
	 .byte 772b-771b;			\
	 .short clobbers;			\
	.popsection


#ifdef CONFIG_X86_64
#define PV_SAVE_REGS   pushq %rax; pushq %rdi; pushq %rcx; pushq %rdx
#define PV_RESTORE_REGS popq %rdx; popq %rcx; popq %rdi; popq %rax
#define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
#else
#define PV_SAVE_REGS   pushl %eax; pushl %edi; pushl %ecx; pushl %edx
#define PV_RESTORE_REGS popl %edx; popl %ecx; popl %edi; popl %eax
#define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
#endif

#define INTERRUPT_RETURN						\
	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,	\
		  jmp *%cs:pv_cpu_ops+PV_CPU_iret)

#define DISABLE_INTERRUPTS(clobbers)					\
	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
		  PV_SAVE_REGS;			\
		  call *%cs:pv_irq_ops+PV_IRQ_irq_disable;		\
		  PV_RESTORE_REGS;)			\

#define ENABLE_INTERRUPTS(clobbers)					\
	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,	\
		  PV_SAVE_REGS;			\
		  call *%cs:pv_irq_ops+PV_IRQ_irq_enable;		\
		  PV_RESTORE_REGS;)

#define ENABLE_INTERRUPTS_SYSCALL_RET					\
	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_syscall_ret),\
		  CLBR_NONE,						\
		  jmp *%cs:pv_cpu_ops+PV_CPU_irq_enable_syscall_ret)


#ifdef CONFIG_X86_32
#define GET_CR0_INTO_EAX			\
	push %ecx; push %edx;			\
	call *pv_cpu_ops+PV_CPU_read_cr0;	\
	pop %edx; pop %ecx
#else
#define SWAPGS								\
	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,	\
		  PV_SAVE_REGS;						\
		  call *pv_cpu_ops+PV_CPU_swapgs;			\
		  PV_RESTORE_REGS					\
		 )

#define GET_CR2_INTO_RCX			\
	call *pv_mmu_ops+PV_MMU_read_cr2;	\
	movq %rax, %rcx;			\
	xorq %rax, %rax;

#endif

#endif /* __ASSEMBLY__ */
#endif /* CONFIG_PARAVIRT */
#endif	/* __ASM_PARAVIRT_H */