/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_PARAVIRT_TYPES_H
#define _ASM_X86_PARAVIRT_TYPES_H

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

#endif /* X86_64 */

#ifndef __ASSEMBLY__

#include <asm/desc_defs.h>
#include <asm/pgtable_types.h>
#include <asm/nospec-branch.h>

struct page;
struct thread_struct;
struct desc_ptr;
struct tss_struct;
struct mm_struct;
struct desc_struct;
struct task_struct;
struct cpumask;
struct flush_tlb_info;
struct mmu_gather;
struct vm_area_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 {
#ifdef CONFIG_PARAVIRT_XXL
        u16 extra_user_64bit_cs;  /* __USER_CS if none */
#endif

        const char *name;
};

#ifdef CONFIG_PARAVIRT_XXL
struct pv_lazy_ops {
        /* Set deferred update mode, used for batching operations. */
        void (*enter)(void);
        void (*leave)(void);
        void (*flush)(void);
} __no_randomize_layout;
#endif

struct pv_cpu_ops {
        /* hooks for various privileged instructions */
        void (*io_delay)(void);

#ifdef CONFIG_PARAVIRT_XXL
        unsigned long (*get_debugreg)(int regno);
        void (*set_debugreg)(int regno, unsigned long value);

        unsigned long (*read_cr0)(void);
        void (*write_cr0)(unsigned long);

        void (*write_cr4)(unsigned long);

        /* Segment descriptor handling */
        void (*load_tr_desc)(void);
        void (*load_gdt)(const struct desc_ptr *);
        void (*load_idt)(const 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);
        void (*load_gs_index)(unsigned int idx);
        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)(unsigned long sp0);

#ifdef CONFIG_X86_IOPL_IOPERM
        void (*invalidate_io_bitmap)(void);
        void (*update_io_bitmap)(void);
#endif

        void (*wbinvd)(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);

        /* Unsafe MSR operations.  These will warn or panic on failure. */
        u64 (*read_msr)(unsigned int msr);
        void (*write_msr)(unsigned int msr, unsigned low, unsigned high);

        /*
         * Safe MSR operations.
         * read sets err to 0 or -EIO.  write returns 0 or -EIO.
         */
        u64 (*read_msr_safe)(unsigned int msr, int *err);
        int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high);

        u64 (*read_pmc)(int counter);

        void (*start_context_switch)(struct task_struct *prev);
        void (*end_context_switch)(struct task_struct *next);
#endif
} __no_randomize_layout;

struct pv_irq_ops {
#ifdef CONFIG_PARAVIRT_XXL
        /*
         * Get/set interrupt state.  save_fl is expected to use X86_EFLAGS_IF;
         * all other bits returned from save_fl are undefined.
         *
         * 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 irq_disable;
        struct paravirt_callee_save irq_enable;

        void (*safe_halt)(void);
        void (*halt)(void);
#endif
} __no_randomize_layout;

struct pv_mmu_ops {
        /* TLB operations */
        void (*flush_tlb_user)(void);
        void (*flush_tlb_kernel)(void);
        void (*flush_tlb_one_user)(unsigned long addr);
        void (*flush_tlb_multi)(const struct cpumask *cpus,
                                const struct flush_tlb_info *info);

        void (*tlb_remove_table)(struct mmu_gather *tlb, void *table);

        /* Hook for intercepting the destruction of an mm_struct. */
        void (*exit_mmap)(struct mm_struct *mm);

#ifdef CONFIG_PARAVIRT_XXL
        struct paravirt_callee_save read_cr2;
        void (*write_cr2)(unsigned long);

        unsigned long (*read_cr3)(void);
        void (*write_cr3)(unsigned long);

        /* Hooks for intercepting the creation/use 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);

        /* 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_pud)(struct mm_struct *mm, unsigned long pfn);
        void (*alloc_p4d)(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);
        void (*release_p4d)(unsigned long pfn);

        /* Pagetable manipulation functions */
        void (*set_pte)(pte_t *ptep, pte_t pteval);
        void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);

        pte_t (*ptep_modify_prot_start)(struct vm_area_struct *vma, unsigned long addr,
                                        pte_t *ptep);
        void (*ptep_modify_prot_commit)(struct vm_area_struct *vma, 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;

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

        struct paravirt_callee_save pmd_val;
        struct paravirt_callee_save make_pmd;

        struct paravirt_callee_save pud_val;
        struct paravirt_callee_save make_pud;

        void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);

#if CONFIG_PGTABLE_LEVELS >= 5
        struct paravirt_callee_save p4d_val;
        struct paravirt_callee_save make_p4d;

        void (*set_pgd)(pgd_t *pgdp, pgd_t pgdval);
#endif  /* CONFIG_PGTABLE_LEVELS >= 5 */

        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);
#endif
} __no_randomize_layout;

struct arch_spinlock;
#ifdef CONFIG_SMP
#include <asm/spinlock_types.h>
#endif

struct qspinlock;

struct pv_lock_ops {
        void (*queued_spin_lock_slowpath)(struct qspinlock *lock, u32 val);
        struct paravirt_callee_save queued_spin_unlock;

        void (*wait)(u8 *ptr, u8 val);
        void (*kick)(int cpu);

        struct paravirt_callee_save vcpu_is_preempted;
} __no_randomize_layout;

/* 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_cpu_ops       cpu;
        struct pv_irq_ops       irq;
        struct pv_mmu_ops       mmu;
        struct pv_lock_ops      lock;
} __no_randomize_layout;

extern struct pv_info pv_info;
extern struct paravirt_patch_template pv_ops;
extern void (*paravirt_iret)(void);

#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" (&(pv_ops.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 NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"

unsigned int paravirt_patch(u8 type, void *insn_buff, unsigned long addr, unsigned int 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                                   \
        ANNOTATE_RETPOLINE_SAFE                         \
        "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 parameters 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_CALL_ARGS                                                  \
        unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx;

#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 */
/* [re]ax isn't an arg, but the return val */
#define PVOP_CALL_ARGS                                          \
        unsigned long __edi = __edi, __esi = __esi,             \
                __edx = __edx, __ecx = __ecx, __eax = __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)

/* void functions are still allowed [re]ax for scratch */
#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(pv_ops.op == NULL)
#else
#define PVOP_TEST_NULL(op)      ((void)pv_ops.op)
#endif

#define PVOP_RETVAL(rettype)                                            \
        ({      unsigned long __mask = ~0UL;                            \
                BUILD_BUG_ON(sizeof(rettype) > sizeof(unsigned long));  \
                switch (sizeof(rettype)) {                              \
                case 1: __mask =       0xffUL; break;                   \
                case 2: __mask =     0xffffUL; break;                   \
                case 4: __mask = 0xffffffffUL; break;                   \
                default: break;                                         \
                }                                                       \
                __mask & __eax;                                         \
        })


#define ____PVOP_CALL(ret, op, clbr, call_clbr, extra_clbr, ...)        \
        ({                                                              \
                PVOP_CALL_ARGS;                                         \
                PVOP_TEST_NULL(op);                                     \
                asm volatile(paravirt_alt(PARAVIRT_CALL)                \
                             : call_clbr, ASM_CALL_CONSTRAINT           \
                             : paravirt_type(op),                       \
                               paravirt_clobber(clbr),                  \
                               ##__VA_ARGS__                            \
                             : "memory", "cc" extra_clbr);              \
                ret;                                                    \
        })

#define ____PVOP_ALT_CALL(ret, op, alt, cond, clbr, call_clbr,          \
                          extra_clbr, ...)                              \
        ({                                                              \
                PVOP_CALL_ARGS;                                         \
                PVOP_TEST_NULL(op);                                     \
                asm volatile(ALTERNATIVE(paravirt_alt(PARAVIRT_CALL),   \
                                         alt, cond)                     \
                             : call_clbr, ASM_CALL_CONSTRAINT           \
                             : paravirt_type(op),                       \
                               paravirt_clobber(clbr),                  \
                               ##__VA_ARGS__                            \
                             : "memory", "cc" extra_clbr);              \
                ret;                                                    \
        })

#define __PVOP_CALL(rettype, op, ...)                                   \
        ____PVOP_CALL(PVOP_RETVAL(rettype), op, CLBR_ANY,               \
                      PVOP_CALL_CLOBBERS, EXTRA_CLOBBERS, ##__VA_ARGS__)

#define __PVOP_ALT_CALL(rettype, op, alt, cond, ...)                    \
        ____PVOP_ALT_CALL(PVOP_RETVAL(rettype), op, alt, cond, CLBR_ANY,\
                          PVOP_CALL_CLOBBERS, EXTRA_CLOBBERS,           \
                          ##__VA_ARGS__)

#define __PVOP_CALLEESAVE(rettype, op, ...)                             \
        ____PVOP_CALL(PVOP_RETVAL(rettype), op.func, CLBR_RET_REG,      \
                      PVOP_CALLEE_CLOBBERS, , ##__VA_ARGS__)

#define __PVOP_ALT_CALLEESAVE(rettype, op, alt, cond, ...)              \
        ____PVOP_ALT_CALL(PVOP_RETVAL(rettype), op.func, alt, cond,     \
                          CLBR_RET_REG, PVOP_CALLEE_CLOBBERS, , ##__VA_ARGS__)


#define __PVOP_VCALL(op, ...)                                           \
        (void)____PVOP_CALL(, op, CLBR_ANY, PVOP_VCALL_CLOBBERS,        \
                       VEXTRA_CLOBBERS, ##__VA_ARGS__)

#define __PVOP_ALT_VCALL(op, alt, cond, ...)                            \
        (void)____PVOP_ALT_CALL(, op, alt, cond, CLBR_ANY,              \
                                PVOP_VCALL_CLOBBERS, VEXTRA_CLOBBERS,   \
                                ##__VA_ARGS__)

#define __PVOP_VCALLEESAVE(op, ...)                                     \
        (void)____PVOP_CALL(, op.func, CLBR_RET_REG,                    \
                            PVOP_VCALLEE_CLOBBERS, , ##__VA_ARGS__)

#define __PVOP_ALT_VCALLEESAVE(op, alt, cond, ...)                      \
        (void)____PVOP_ALT_CALL(, op.func, alt, cond, CLBR_RET_REG,     \
                                PVOP_VCALLEE_CLOBBERS, , ##__VA_ARGS__)


#define PVOP_CALL0(rettype, op)                                         \
        __PVOP_CALL(rettype, op)
#define PVOP_VCALL0(op)                                                 \
        __PVOP_VCALL(op)
#define PVOP_ALT_CALL0(rettype, op, alt, cond)                          \
        __PVOP_ALT_CALL(rettype, op, alt, cond)
#define PVOP_ALT_VCALL0(op, alt, cond)                                  \
        __PVOP_ALT_VCALL(op, alt, cond)

#define PVOP_CALLEE0(rettype, op)                                       \
        __PVOP_CALLEESAVE(rettype, op)
#define PVOP_VCALLEE0(op)                                               \
        __PVOP_VCALLEESAVE(op)
#define PVOP_ALT_CALLEE0(rettype, op, alt, cond)                        \
        __PVOP_ALT_CALLEESAVE(rettype, op, alt, cond)
#define PVOP_ALT_VCALLEE0(op, alt, cond)                                \
        __PVOP_ALT_VCALLEESAVE(op, alt, cond)


#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_ALT_VCALL1(op, arg1, alt, cond)                            \
        __PVOP_ALT_VCALL(op, alt, cond, 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_ALT_CALLEE1(rettype, op, arg1, alt, cond)                  \
        __PVOP_ALT_CALLEESAVE(rettype, op, alt, cond, PVOP_CALL_ARG1(arg1))
#define PVOP_ALT_VCALLEE1(op, arg1, alt, cond)                          \
        __PVOP_ALT_VCALLEESAVE(op, alt, cond, 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_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))

#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))

/* 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_flush_lazy_mmu(void);

void _paravirt_nop(void);
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 type;                /* type of this instruction */
        u8 len;                 /* length of original instruction */
};

extern struct paravirt_patch_site __parainstructions[],
        __parainstructions_end[];

#endif  /* __ASSEMBLY__ */

#endif  /* _ASM_X86_PARAVIRT_TYPES_H */