Merge branch 'x86/paravirt' into x86/cleanups

#include <asm/pgtable_types.h>

#include <asm/asm.h>

/* Bitmask of what can be clobbered: usually at least eax. */

#define CLBR_NONE 0

#define CLBR_EAX  (1 << 0)

#define CLBR_ECX  (1 << 1)

#define CLBR_EDX  (1 << 2)

#define CLBR_EDI  (1 << 3)

#ifdef CONFIG_X86_32

/* CLBR_ANY should match all regs platform has. For i386, that's just it */

#define CLBR_ANY  ((1 << 4) - 1)

#define CLBR_ARG_REGS	(CLBR_EAX | CLBR_EDX | CLBR_ECX)

#define CLBR_RET_REG	(CLBR_EAX | CLBR_EDX)

#define CLBR_SCRATCH	(0)

#else

#define CLBR_RAX  CLBR_EAX

#define CLBR_RCX  CLBR_ECX

#define CLBR_RDX  CLBR_EDX

#define CLBR_RDI  CLBR_EDI

#define CLBR_RSI  (1 << 4)

#define CLBR_R8   (1 << 5)

#define CLBR_R9   (1 << 6)

#define CLBR_R10  (1 << 7)

#define CLBR_R11  (1 << 8)

#define CLBR_ANY  ((1 << 9) - 1)

#define CLBR_ARG_REGS	(CLBR_RDI | CLBR_RSI | CLBR_RDX | \

			 CLBR_RCX | CLBR_R8 | CLBR_R9)

#define CLBR_RET_REG	(CLBR_RAX)

#define CLBR_SCRATCH	(CLBR_R10 | CLBR_R11)

#include <asm/desc_defs.h>

#endif /* X86_64 */

#define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)

#include <asm/paravirt_types.h>

#ifndef __ASSEMBLY__

#include <linux/types.h>

#include <linux/cpumask.h>

#include <asm/kmap_types.h>

#include <asm/desc_defs.h>

struct page;

struct thread_struct;

struct desc_ptr;

struct tss_struct;

struct mm_struct;

struct desc_struct;

struct task_struct;

/*

 * Wrapper type for pointers to code which uses the non-standard

 * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.

 */

struct paravirt_callee_save {

	void *func;

};

/* general info */

struct pv_info {

	unsigned int kernel_rpl;

	int shared_kernel_pmd;

	int paravirt_enabled;

	const char *name;

};

struct pv_init_ops {

	/*

	 * 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);

	/* Print a banner to identify the environment */

	void (*banner)(void);

};

struct pv_lazy_ops {

	/* Set deferred update mode, used for batching operations. */

	void (*enter)(void);

	void (*leave)(void);

};

struct pv_time_ops {

	void (*time_init)(void);

	/* Set and set time of day */

	unsigned long (*get_wallclock)(void);

	int (*set_wallclock)(unsigned long);

	unsigned long long (*sched_clock)(void);

	unsigned long (*get_tsc_khz)(void);

};

struct pv_cpu_ops {

	/* 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_cr4_safe)(void);

	unsigned long (*read_cr4)(void);

	void (*write_cr4)(unsigned long);

#ifdef CONFIG_X86_64

	unsigned long (*read_cr8)(void);

	void (*write_cr8)(unsigned long);

#endif

	/* Segment descriptor handling */

	void (*load_tr_desc)(void);

	void (*load_gdt)(const struct desc_ptr *);

	void (*load_idt)(const struct desc_ptr *);

	void (*store_gdt)(struct desc_ptr *);

	void (*store_idt)(struct desc_ptr *);

	void (*set_ldt)(const void *desc, unsigned entries);

	unsigned long (*store_tr)(void);

	void (*load_tls)(struct thread_struct *t, unsigned int cpu);

#ifdef CONFIG_X86_64

	void (*load_gs_index)(unsigned int idx);

#endif

	void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,

				const void *desc);

	void (*write_gdt_entry)(struct desc_struct *,

				int entrynum, const void *desc, int size);

	void (*write_idt_entry)(gate_desc *,

				int entrynum, const gate_desc *gate);

	void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);

	void (*free_ldt)(struct desc_struct *ldt, unsigned entries);

	void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);

	void (*set_iopl_mask)(unsigned mask);

	void (*wbinvd)(void);

	void (*io_delay)(void);

	/* cpuid emulation, mostly so that caps bits can be disabled */

	void (*cpuid)(unsigned int *eax, unsigned int *ebx,

		      unsigned int *ecx, unsigned int *edx);

	/* MSR, PMC and TSR operations.

	   err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */

	u64 (*read_msr_amd)(unsigned int msr, int *err);

	u64 (*read_msr)(unsigned int msr, int *err);

	int (*write_msr)(unsigned int msr, unsigned low, unsigned high);

	u64 (*read_tsc)(void);

	u64 (*read_pmc)(int counter);

	unsigned long long (*read_tscp)(unsigned int *aux);

	/*

	 * Atomically enable interrupts and return to userspace.  This

	 * is only ever used to return to 32-bit processes; in a

	 * 64-bit kernel, it's used for 32-on-64 compat processes, but

	 * never native 64-bit processes.  (Jump, not call.)

	 */

	void (*irq_enable_sysexit)(void);

	/*

	 * Switch to usermode gs and return to 64-bit usermode using

	 * sysret.  Only used in 64-bit kernels to return to 64-bit

	 * processes.  Usermode register state, including %rsp, must

	 * already be restored.

	 */

	void (*usergs_sysret64)(void);

	/*

	 * Switch to usermode gs and return to 32-bit usermode using

	 * sysret.  Used to return to 32-on-64 compat processes.

	 * Other usermode register state, including %esp, must already

	 * be restored.

	 */

	void (*usergs_sysret32)(void);

	/* Normal iret.  Jump to this with the standard iret stack

	   frame set up. */

	void (*iret)(void);

	void (*swapgs)(void);

	void (*start_context_switch)(struct task_struct *prev);

	void (*end_context_switch)(struct task_struct *next);

};

struct pv_irq_ops {

	void (*init_IRQ)(void);

	/*

	 * 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.

	 *

	 * NOTE: These functions callers expect the callee to preserve

	 * more registers than the standard C calling convention.

	 */

	struct paravirt_callee_save save_fl;

	struct paravirt_callee_save restore_fl;

	struct paravirt_callee_save irq_disable;

	struct paravirt_callee_save irq_enable;

	void (*safe_halt)(void);

	void (*halt)(void);

#ifdef CONFIG_X86_64

	void (*adjust_exception_frame)(void);

#endif

};

struct pv_apic_ops {

#ifdef CONFIG_X86_LOCAL_APIC

	void (*setup_boot_clock)(void);

	void (*setup_secondary_clock)(void);

	void (*startup_ipi_hook)(int phys_apicid,

				 unsigned long start_eip,

				 unsigned long start_esp);

#endif

};

struct pv_mmu_ops {

	/*

	 * 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);

	unsigned long (*read_cr2)(void);

	void (*write_cr2)(unsigned long);

	unsigned long (*read_cr3)(void);

	void (*write_cr3)(unsigned long);

	/*

	 * Hooks for intercepting the creation/use/destruction of an

	 * mm_struct.

	 */

	void (*activate_mm)(struct mm_struct *prev,

			    struct mm_struct *next);

	void (*dup_mmap)(struct mm_struct *oldmm,

			 struct mm_struct *mm);

	void (*exit_mmap)(struct mm_struct *mm);

	/* TLB operations */

	void (*flush_tlb_user)(void);

	void (*flush_tlb_kernel)(void);

	void (*flush_tlb_single)(unsigned long addr);

	void (*flush_tlb_others)(const struct cpumask *cpus,

				 struct mm_struct *mm,

				 unsigned long va);

	/* Hooks for allocating and freeing a pagetable top-level */

	int  (*pgd_alloc)(struct mm_struct *mm);

	void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);

	/*

	 * Hooks for allocating/releasing pagetable pages when they're

	 * attached to a pagetable

	 */

	void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);

	void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);

	void (*alloc_pmd_clone)(unsigned long pfn, unsigned long clonepfn, unsigned long start, unsigned long count);

	void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);

	void (*release_pte)(unsigned long pfn);

	void (*release_pmd)(unsigned long pfn);

	void (*release_pud)(unsigned long pfn);

	/* Pagetable manipulation functions */

	void (*set_pte)(pte_t *ptep, pte_t pteval);

	void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,

			   pte_t *ptep, pte_t pteval);

	void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);

	void (*pte_update)(struct mm_struct *mm, unsigned long addr,

			   pte_t *ptep);

	void (*pte_update_defer)(struct mm_struct *mm,

				 unsigned long addr, pte_t *ptep);

	pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,

					pte_t *ptep);

	void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,

					pte_t *ptep, pte_t pte);

	struct paravirt_callee_save pte_val;

	struct paravirt_callee_save make_pte;

	struct paravirt_callee_save pgd_val;

	struct paravirt_callee_save make_pgd;

#if PAGETABLE_LEVELS >= 3

#ifdef CONFIG_X86_PAE

	void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);

	void (*pte_clear)(struct mm_struct *mm, unsigned long addr,

			  pte_t *ptep);

	void (*pmd_clear)(pmd_t *pmdp);

#endif	/* CONFIG_X86_PAE */

	void (*set_pud)(pud_t *pudp, pud_t pudval);

	struct paravirt_callee_save pmd_val;

	struct paravirt_callee_save make_pmd;

#if PAGETABLE_LEVELS == 4

	struct paravirt_callee_save pud_val;

	struct paravirt_callee_save make_pud;

	void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);

#endif	/* PAGETABLE_LEVELS == 4 */

#endif	/* PAGETABLE_LEVELS >= 3 */

#ifdef CONFIG_HIGHPTE

	void *(*kmap_atomic_pte)(struct page *page, enum km_type type);

#endif

	struct pv_lazy_ops lazy_mode;

	/* dom0 ops */

	/* Sometimes the physical address is a pfn, and sometimes its

	   an mfn.  We can tell which is which from the index. */

	void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,

			   phys_addr_t phys, pgprot_t flags);

};

struct raw_spinlock;

struct pv_lock_ops {

	int (*spin_is_locked)(struct raw_spinlock *lock);

	int (*spin_is_contended)(struct raw_spinlock *lock);

	void (*spin_lock)(struct raw_spinlock *lock);

	void (*spin_lock_flags)(struct raw_spinlock *lock, unsigned long flags);

	int (*spin_trylock)(struct raw_spinlock *lock);

	void (*spin_unlock)(struct raw_spinlock *lock);

};

/* This contains all the paravirt structures: we get a convenient

 * number for each function using the offset which we use to indicate

 * what to patch. */

struct paravirt_patch_template {

	struct pv_init_ops pv_init_ops;

	struct pv_time_ops pv_time_ops;

	struct pv_cpu_ops pv_cpu_ops;

	struct pv_irq_ops pv_irq_ops;

	struct pv_apic_ops pv_apic_ops;

	struct pv_mmu_ops pv_mmu_ops;

	struct pv_lock_ops pv_lock_ops;

};

extern struct pv_info pv_info;

extern struct pv_init_ops pv_init_ops;

extern struct pv_time_ops pv_time_ops;

extern struct pv_cpu_ops pv_cpu_ops;

extern struct pv_irq_ops pv_irq_ops;

extern struct pv_apic_ops pv_apic_ops;

extern struct pv_mmu_ops pv_mmu_ops;

extern struct pv_lock_ops pv_lock_ops;

#define PARAVIRT_PATCH(x)					\

	(offsetof(struct paravirt_patch_template, x) / sizeof(void *))

#define paravirt_type(op)				\

	[paravirt_typenum] "i" (PARAVIRT_PATCH(op)),	\

	[paravirt_opptr] "i" (&(op))

#define paravirt_clobber(clobber)		\

	[paravirt_clobber] "i" (clobber)

/*

 * Generate some code, and mark it as patchable by the

 * apply_paravirt() alternate instruction patcher.

 */

#define _paravirt_alt(insn_string, type, clobber)	\

	"771:\n\t" insn_string "\n" "772:\n"		\

	".pushsection .parainstructions,\"a\"\n"	\

	_ASM_ALIGN "\n"					\

	_ASM_PTR " 771b\n"				\

	"  .byte " type "\n"				\

	"  .byte 772b-771b\n"				\

	"  .short " clobber "\n"			\

	".popsection\n"

/* Generate patchable code, with the default asm parameters. */

#define paravirt_alt(insn_string)					\

	_paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")

/* Simple instruction patching code. */

#define DEF_NATIVE(ops, name, code) 					\

	extern const char start_##ops##_##name[], end_##ops##_##name[];	\

	asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")

unsigned paravirt_patch_nop(void);

unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);

unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);

unsigned paravirt_patch_ignore(unsigned len);

unsigned paravirt_patch_call(void *insnbuf,

			     const void *target, u16 tgt_clobbers,

			     unsigned long addr, u16 site_clobbers,

			     unsigned len);

unsigned paravirt_patch_jmp(void *insnbuf, const void *target,

			    unsigned long addr, unsigned len);

unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,

				unsigned long addr, unsigned len);

unsigned paravirt_patch_insns(void *insnbuf, unsigned len,

			      const char *start, const char *end);

unsigned native_patch(u8 type, u16 clobbers, void *ibuf,

		      unsigned long addr, unsigned len);

int paravirt_disable_iospace(void);

/*

 * This generates an indirect call based on the operation type number.

 * The type number, computed in PARAVIRT_PATCH, is derived from the

 * offset into the paravirt_patch_template structure, and can therefore be

 * freely converted back into a structure offset.

 */

#define PARAVIRT_CALL	"call *%c[paravirt_opptr];"

/*

 * These macros are intended to wrap calls through one of the paravirt

 * ops structs, so that they can be later identified and patched at

 * runtime.

 *

 * Normally, a call to a pv_op function is a simple indirect call:

 * (pv_op_struct.operations)(args...).

 *

 * Unfortunately, this is a relatively slow operation for modern CPUs,

 * because it cannot necessarily determine what the destination

 * address is.  In this case, the address is a runtime constant, so at

 * the very least we can patch the call to e a simple direct call, or

 * ideally, patch an inline implementation into the callsite.  (Direct

 * calls are essentially free, because the call and return addresses

 * are completely predictable.)

 *

 * For i386, these macros rely on the standard gcc "regparm(3)" calling

 * convention, in which the first three arguments are placed in %eax,

 * %edx, %ecx (in that order), and the remaining arguments are placed

 * on the stack.  All caller-save registers (eax,edx,ecx) are expected

 * to be modified (either clobbered or used for return values).

 * X86_64, on the other hand, already specifies a register-based calling

 * conventions, returning at %rax, with parameteres going on %rdi, %rsi,

 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any

 * special handling for dealing with 4 arguments, unlike i386.

 * However, x86_64 also have to clobber all caller saved registers, which

 * unfortunately, are quite a bit (r8 - r11)

 *

 * The call instruction itself is marked by placing its start address

 * and size into the .parainstructions section, so that

 * apply_paravirt() in arch/i386/kernel/alternative.c can do the

 * appropriate patching under the control of the backend pv_init_ops

 * implementation.

 *

 * Unfortunately there's no way to get gcc to generate the args setup

 * for the call, and then allow the call itself to be generated by an

 * inline asm.  Because of this, we must do the complete arg setup and

 * return value handling from within these macros.  This is fairly

 * cumbersome.

 *

 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.

 * It could be extended to more arguments, but there would be little

 * to be gained from that.  For each number of arguments, there are

 * the two VCALL and CALL variants for void and non-void functions.

 *

 * When there is a return value, the invoker of the macro must specify

 * the return type.  The macro then uses sizeof() on that type to

 * determine whether its a 32 or 64 bit value, and places the return

 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for

 * 64-bit). For x86_64 machines, it just returns at %rax regardless of

 * the return value size.

 *

 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments

 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments

 * in low,high order

 *

 * Small structures are passed and returned in registers.  The macro

 * calling convention can't directly deal with this, so the wrapper

 * functions must do this.

 *

 * These PVOP_* macros are only defined within this header.  This

 * means that all uses must be wrapped in inline functions.  This also

 * makes sure the incoming and outgoing types are always correct.

 */

#ifdef CONFIG_X86_32

#define PVOP_VCALL_ARGS				\

	unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx

#define PVOP_CALL_ARGS			PVOP_VCALL_ARGS

#define PVOP_CALL_ARG1(x)		"a" ((unsigned long)(x))

#define PVOP_CALL_ARG2(x)		"d" ((unsigned long)(x))

#define PVOP_CALL_ARG3(x)		"c" ((unsigned long)(x))

#define PVOP_VCALL_CLOBBERS		"=a" (__eax), "=d" (__edx),	\

					"=c" (__ecx)

#define PVOP_CALL_CLOBBERS		PVOP_VCALL_CLOBBERS

#define PVOP_VCALLEE_CLOBBERS		"=a" (__eax), "=d" (__edx)

#define PVOP_CALLEE_CLOBBERS		PVOP_VCALLEE_CLOBBERS

#define EXTRA_CLOBBERS

#define VEXTRA_CLOBBERS

#else  /* CONFIG_X86_64 */

#define PVOP_VCALL_ARGS					\

	unsigned long __edi = __edi, __esi = __esi,	\

		__edx = __edx, __ecx = __ecx

#define PVOP_CALL_ARGS		PVOP_VCALL_ARGS, __eax

#define PVOP_CALL_ARG1(x)		"D" ((unsigned long)(x))

#define PVOP_CALL_ARG2(x)		"S" ((unsigned long)(x))

#define PVOP_CALL_ARG3(x)		"d" ((unsigned long)(x))

#define PVOP_CALL_ARG4(x)		"c" ((unsigned long)(x))

#define PVOP_VCALL_CLOBBERS	"=D" (__edi),				\

				"=S" (__esi), "=d" (__edx),		\

				"=c" (__ecx)

#define PVOP_CALL_CLOBBERS	PVOP_VCALL_CLOBBERS, "=a" (__eax)

#define PVOP_VCALLEE_CLOBBERS	"=a" (__eax)

#define PVOP_CALLEE_CLOBBERS	PVOP_VCALLEE_CLOBBERS

#define EXTRA_CLOBBERS	 , "r8", "r9", "r10", "r11"

#define VEXTRA_CLOBBERS	 , "rax", "r8", "r9", "r10", "r11"

#endif	/* CONFIG_X86_32 */

#ifdef CONFIG_PARAVIRT_DEBUG

#define PVOP_TEST_NULL(op)	BUG_ON(op == NULL)

#else

#define PVOP_TEST_NULL(op)	((void)op)

#endif

#define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr,		\

		      pre, post, ...)					\

	({								\

		rettype __ret;						\

		PVOP_CALL_ARGS;						\

		PVOP_TEST_NULL(op);					\

		/* This is 32-bit specific, but is okay in 64-bit */	\

		/* since this condition will never hold */		\

		if (sizeof(rettype) > sizeof(unsigned long)) {		\

			asm volatile(pre				\

				     paravirt_alt(PARAVIRT_CALL)	\

				     post				\

				     : call_clbr			\

				     : paravirt_type(op),		\

				       paravirt_clobber(clbr),		\

				       ##__VA_ARGS__			\

				     : "memory", "cc" extra_clbr);	\

			__ret = (rettype)((((u64)__edx) << 32) | __eax); \

		} else {						\

			asm volatile(pre				\

				     paravirt_alt(PARAVIRT_CALL)	\

				     post				\

				     : call_clbr			\

				     : paravirt_type(op),		\

				       paravirt_clobber(clbr),		\

				       ##__VA_ARGS__			\

				     : "memory", "cc" extra_clbr);	\

			__ret = (rettype)__eax;				\

		}							\

		__ret;							\

	})

#define __PVOP_CALL(rettype, op, pre, post, ...)			\

	____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS,	\

		      EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)

#define __PVOP_CALLEESAVE(rettype, op, pre, post, ...)			\

	____PVOP_CALL(rettype, op.func, CLBR_RET_REG,			\

		      PVOP_CALLEE_CLOBBERS, ,				\

		      pre, post, ##__VA_ARGS__)

#define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...)	\

	({								\

		PVOP_VCALL_ARGS;					\

		PVOP_TEST_NULL(op);					\

		asm volatile(pre					\

			     paravirt_alt(PARAVIRT_CALL)		\

			     post					\

			     : call_clbr				\

			     : paravirt_type(op),			\

			       paravirt_clobber(clbr),			\

			       ##__VA_ARGS__				\

			     : "memory", "cc" extra_clbr);		\

	})

#define __PVOP_VCALL(op, pre, post, ...)				\

	____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS,		\

		       VEXTRA_CLOBBERS,					\

		       pre, post, ##__VA_ARGS__)

#define __PVOP_VCALLEESAVE(rettype, op, pre, post, ...)			\

	____PVOP_CALL(rettype, op.func, CLBR_RET_REG,			\

		      PVOP_VCALLEE_CLOBBERS, ,				\

		      pre, post, ##__VA_ARGS__)

#define PVOP_CALL0(rettype, op)						\

	__PVOP_CALL(rettype, op, "", "")

#define PVOP_VCALL0(op)							\

	__PVOP_VCALL(op, "", "")

#define PVOP_CALLEE0(rettype, op)					\

	__PVOP_CALLEESAVE(rettype, op, "", "")

#define PVOP_VCALLEE0(op)						\

	__PVOP_VCALLEESAVE(op, "", "")

#define PVOP_CALL1(rettype, op, arg1)					\

	__PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))

#define PVOP_VCALL1(op, arg1)						\

	__PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))

#define PVOP_CALLEE1(rettype, op, arg1)					\

	__PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))

#define PVOP_VCALLEE1(op, arg1)						\

	__PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))

#define PVOP_CALL2(rettype, op, arg1, arg2)				\

	__PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),		\

		    PVOP_CALL_ARG2(arg2))

#define PVOP_VCALL2(op, arg1, arg2)					\

	__PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),			\

		     PVOP_CALL_ARG2(arg2))

#define PVOP_CALLEE2(rettype, op, arg1, arg2)				\

	__PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1),	\

			  PVOP_CALL_ARG2(arg2))

#define PVOP_VCALLEE2(op, arg1, arg2)					\

	__PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1),		\

			   PVOP_CALL_ARG2(arg2))

#define PVOP_CALL3(rettype, op, arg1, arg2, arg3)			\

	__PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),		\

		    PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))

#define PVOP_VCALL3(op, arg1, arg2, arg3)				\

	__PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),			\

		     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))

/* This is the only difference in x86_64. We can make it much simpler */

#ifdef CONFIG_X86_32

#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)			\

	__PVOP_CALL(rettype, op,					\

		    "push %[_arg4];", "lea 4(%%esp),%%esp;",		\

		    PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),		\

		    PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))

#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)				\

	__PVOP_VCALL(op,						\

		    "push %[_arg4];", "lea 4(%%esp),%%esp;",		\

		    "0" ((u32)(arg1)), "1" ((u32)(arg2)),		\

		    "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))

#else

#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)			\

	__PVOP_CALL(rettype, op, "", "",				\

		    PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),		\

		    PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))

#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)				\

	__PVOP_VCALL(op, "", "",					\

		     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),	\

		     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))

#endif

static inline int paravirt_enabled(void)

{

}

#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_start_context_switch(struct task_struct *prev);

void paravirt_end_context_switch(struct task_struct *next);

void paravirt_enter_lazy_mmu(void);

void paravirt_leave_lazy_mmu(void);

#define  __HAVE_ARCH_START_CONTEXT_SWITCH

static inline void arch_start_context_switch(struct task_struct *prev)

{

	pv_mmu_ops.set_fixmap(idx, phys, flags);

}

void _paravirt_nop(void);

u32 _paravirt_ident_32(u32);

u64 _paravirt_ident_64(u64);

#define paravirt_nop	((void *)_paravirt_nop)

#if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)

static inline int __raw_spin_is_locked(struct raw_spinlock *lock)

#endif

/* 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;"