Merge branch 'sched/clock' into x86/cleanups

[mirror_ubuntu-artful-kernel.git] / arch / x86 / include / asm / paravirt_types.h

#ifndef _ASM_X86_PARAVIRT_TYPES_H
#define _ASM_X86_PARAVIRT_TYPES_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)

#endif /* X86_64 */

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

#ifndef __ASSEMBLY__

#include <asm/desc_defs.h>
#include <asm/kmap_types.h>

struct page;
struct thread_struct;
struct desc_ptr;
struct tss_struct;
struct mm_struct;
struct desc_struct;
struct task_struct;
struct cpumask;

/*
 * 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

/* 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);

void _paravirt_nop(void);
u32 _paravirt_ident_32(u32);
u64 _paravirt_ident_64(u64);

#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[];

#endif  /* __ASSEMBLY__ */

#endif  /* _ASM_X86_PARAVIRT_TYPES_H */