[deliverable/linux.git] / arch / x86 / include / asm / kvm_emulate.h

/******************************************************************************
 * x86_emulate.h
 *
 * Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
 *
 * Copyright (c) 2005 Keir Fraser
 *
 * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
 */

#ifndef _ASM_X86_KVM_X86_EMULATE_H
#define _ASM_X86_KVM_X86_EMULATE_H

#include <asm/desc_defs.h>

struct x86_emulate_ctxt;

struct x86_exception {
	u8 vector;
	bool error_code_valid;
	u16 error_code;
	bool nested_page_fault;
	u64 address; /* cr2 or nested page fault gpa */
};

/*
 * x86_emulate_ops:
 *
 * These operations represent the instruction emulator's interface to memory.
 * There are two categories of operation: those that act on ordinary memory
 * regions (*_std), and those that act on memory regions known to require
 * special treatment or emulation (*_emulated).
 *
 * The emulator assumes that an instruction accesses only one 'emulated memory'
 * location, that this location is the given linear faulting address (cr2), and
 * that this is one of the instruction's data operands. Instruction fetches and
 * stack operations are assumed never to access emulated memory. The emulator
 * automatically deduces which operand of a string-move operation is accessing
 * emulated memory, and assumes that the other operand accesses normal memory.
 *
 * NOTES:
 *  1. The emulator isn't very smart about emulated vs. standard memory.
 *     'Emulated memory' access addresses should be checked for sanity.
 *     'Normal memory' accesses may fault, and the caller must arrange to
 *     detect and handle reentrancy into the emulator via recursive faults.
 *     Accesses may be unaligned and may cross page boundaries.
 *  2. If the access fails (cannot emulate, or a standard access faults) then
 *     it is up to the memop to propagate the fault to the guest VM via
 *     some out-of-band mechanism, unknown to the emulator. The memop signals
 *     failure by returning X86EMUL_PROPAGATE_FAULT to the emulator, which will
 *     then immediately bail.
 *  3. Valid access sizes are 1, 2, 4 and 8 bytes. On x86/32 systems only
 *     cmpxchg8b_emulated need support 8-byte accesses.
 *  4. The emulator cannot handle 64-bit mode emulation on an x86/32 system.
 */
/* Access completed successfully: continue emulation as normal. */
#define X86EMUL_CONTINUE        0
/* Access is unhandleable: bail from emulation and return error to caller. */
#define X86EMUL_UNHANDLEABLE    1
/* Terminate emulation but return success to the caller. */
#define X86EMUL_PROPAGATE_FAULT 2 /* propagate a generated fault to guest */
#define X86EMUL_RETRY_INSTR     3 /* retry the instruction for some reason */
#define X86EMUL_CMPXCHG_FAILED  4 /* cmpxchg did not see expected value */
#define X86EMUL_IO_NEEDED       5 /* IO is needed to complete emulation */

struct x86_emulate_ops {
	/*
	 * read_std: Read bytes of standard (non-emulated/special) memory.
	 *           Used for descriptor reading.
	 *  @addr:  [IN ] Linear address from which to read.
	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
	 *  @bytes: [IN ] Number of bytes to read from memory.
	 */
	int (*read_std)(unsigned long addr, void *val,
			unsigned int bytes, struct kvm_vcpu *vcpu,
			struct x86_exception *fault);

	/*
	 * write_std: Write bytes of standard (non-emulated/special) memory.
	 *            Used for descriptor writing.
	 *  @addr:  [IN ] Linear address to which to write.
	 *  @val:   [OUT] Value write to memory, zero-extended to 'u_long'.
	 *  @bytes: [IN ] Number of bytes to write to memory.
	 */
	int (*write_std)(unsigned long addr, void *val,
			 unsigned int bytes, struct kvm_vcpu *vcpu,
			 struct x86_exception *fault);
	/*
	 * fetch: Read bytes of standard (non-emulated/special) memory.
	 *        Used for instruction fetch.
	 *  @addr:  [IN ] Linear address from which to read.
	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
	 *  @bytes: [IN ] Number of bytes to read from memory.
	 */
	int (*fetch)(unsigned long addr, void *val,
		     unsigned int bytes, struct kvm_vcpu *vcpu,
		     struct x86_exception *fault);

	/*
	 * read_emulated: Read bytes from emulated/special memory area.
	 *  @addr:  [IN ] Linear address from which to read.
	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
	 *  @bytes: [IN ] Number of bytes to read from memory.
	 */
	int (*read_emulated)(unsigned long addr,
			     void *val,
			     unsigned int bytes,
			     struct x86_exception *fault,
			     struct kvm_vcpu *vcpu);

	/*
	 * write_emulated: Write bytes to emulated/special memory area.
	 *  @addr:  [IN ] Linear address to which to write.
	 *  @val:   [IN ] Value to write to memory (low-order bytes used as
	 *                required).
	 *  @bytes: [IN ] Number of bytes to write to memory.
	 */
	int (*write_emulated)(unsigned long addr,
			      const void *val,
			      unsigned int bytes,
			      struct x86_exception *fault,
			      struct kvm_vcpu *vcpu);

	/*
	 * cmpxchg_emulated: Emulate an atomic (LOCKed) CMPXCHG operation on an
	 *                   emulated/special memory area.
	 *  @addr:  [IN ] Linear address to access.
	 *  @old:   [IN ] Value expected to be current at @addr.
	 *  @new:   [IN ] Value to write to @addr.
	 *  @bytes: [IN ] Number of bytes to access using CMPXCHG.
	 */
	int (*cmpxchg_emulated)(unsigned long addr,
				const void *old,
				const void *new,
				unsigned int bytes,
				struct x86_exception *fault,
				struct kvm_vcpu *vcpu);

	int (*pio_in_emulated)(int size, unsigned short port, void *val,
			       unsigned int count, struct kvm_vcpu *vcpu);

	int (*pio_out_emulated)(int size, unsigned short port, const void *val,
				unsigned int count, struct kvm_vcpu *vcpu);

	bool (*get_cached_descriptor)(struct desc_struct *desc, u32 *base3,
				      int seg, struct kvm_vcpu *vcpu);
	void (*set_cached_descriptor)(struct desc_struct *desc, u32 base3,
				      int seg, struct kvm_vcpu *vcpu);
	u16 (*get_segment_selector)(int seg, struct kvm_vcpu *vcpu);
	void (*set_segment_selector)(u16 sel, int seg, struct kvm_vcpu *vcpu);
	unsigned long (*get_cached_segment_base)(int seg, struct kvm_vcpu *vcpu);
	void (*get_gdt)(struct desc_ptr *dt, struct kvm_vcpu *vcpu);
	void (*get_idt)(struct desc_ptr *dt, struct kvm_vcpu *vcpu);
	ulong (*get_cr)(int cr, struct kvm_vcpu *vcpu);
	int (*set_cr)(int cr, ulong val, struct kvm_vcpu *vcpu);
	int (*cpl)(struct kvm_vcpu *vcpu);
	int (*get_dr)(int dr, unsigned long *dest, struct kvm_vcpu *vcpu);
	int (*set_dr)(int dr, unsigned long value, struct kvm_vcpu *vcpu);
	int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
	int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
	void (*get_fpu)(struct x86_emulate_ctxt *ctxt); /* disables preempt */
	void (*put_fpu)(struct x86_emulate_ctxt *ctxt); /* reenables preempt */
};

typedef u32 __attribute__((vector_size(16))) sse128_t;

/* Type, address-of, and value of an instruction's operand. */
struct operand {
	enum { OP_REG, OP_MEM, OP_IMM, OP_XMM, OP_NONE } type;
	unsigned int bytes;
	union {
		unsigned long orig_val;
		u64 orig_val64;
	};
	union {
		unsigned long *reg;
		struct segmented_address {
			ulong ea;
			unsigned seg;
		} mem;
		unsigned xmm;
	} addr;
	union {
		unsigned long val;
		u64 val64;
		char valptr[sizeof(unsigned long) + 2];
		sse128_t vec_val;
	};
};

struct fetch_cache {
	u8 data[15];
	unsigned long start;
	unsigned long end;
};

struct read_cache {
	u8 data[1024];
	unsigned long pos;
	unsigned long end;
};

struct decode_cache {
	u8 twobyte;
	u8 b;
	u8 lock_prefix;
	u8 rep_prefix;
	u8 op_bytes;
	u8 ad_bytes;
	u8 rex_prefix;
	struct operand src;
	struct operand src2;
	struct operand dst;
	bool has_seg_override;
	u8 seg_override;
	unsigned int d;
	int (*execute)(struct x86_emulate_ctxt *ctxt);
	unsigned long regs[NR_VCPU_REGS];
	unsigned long eip;
	/* modrm */
	u8 modrm;
	u8 modrm_mod;
	u8 modrm_reg;
	u8 modrm_rm;
	u8 modrm_seg;
	bool rip_relative;
	struct fetch_cache fetch;
	struct read_cache io_read;
	struct read_cache mem_read;
};

struct x86_emulate_ctxt {
	struct x86_emulate_ops *ops;

	/* Register state before/after emulation. */
	struct kvm_vcpu *vcpu;

	unsigned long eflags;
	unsigned long eip; /* eip before instruction emulation */
	/* Emulated execution mode, represented by an X86EMUL_MODE value. */
	int mode;
	u32 cs_base;

	/* interruptibility state, as a result of execution of STI or MOV SS */
	int interruptibility;

	bool perm_ok; /* do not check permissions if true */
	bool only_vendor_specific_insn;

	bool have_exception;
	struct x86_exception exception;

	/* decode cache */
	struct decode_cache decode;
};

/* Repeat String Operation Prefix */
#define REPE_PREFIX	0xf3
#define REPNE_PREFIX	0xf2

/* Execution mode, passed to the emulator. */
#define X86EMUL_MODE_REAL     0	/* Real mode.             */
#define X86EMUL_MODE_VM86     1	/* Virtual 8086 mode.     */
#define X86EMUL_MODE_PROT16   2	/* 16-bit protected mode. */
#define X86EMUL_MODE_PROT32   4	/* 32-bit protected mode. */
#define X86EMUL_MODE_PROT64   8	/* 64-bit (long) mode.    */

/* Host execution mode. */
#if defined(CONFIG_X86_32)
#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32
#elif defined(CONFIG_X86_64)
#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT64
#endif

int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len);
#define EMULATION_FAILED -1
#define EMULATION_OK 0
#define EMULATION_RESTART 1
int x86_emulate_insn(struct x86_emulate_ctxt *ctxt);
int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
			 u16 tss_selector, int reason,
			 bool has_error_code, u32 error_code);
int emulate_int_real(struct x86_emulate_ctxt *ctxt,
		     struct x86_emulate_ops *ops, int irq);
#endif /* _ASM_X86_KVM_X86_EMULATE_H */
Commit	Line	Data
6aa8b732 AK	1	/******************************************************************************
	2	* x86_emulate.h
	3	*
	4	* Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
	5	*
	6	* Copyright (c) 2005 Keir Fraser
	7	*
	8	* From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
	9	*/
	10
1965aae3 PA	11	#ifndef _ASM_X86_KVM_X86_EMULATE_H
1965aae3 PA	12	#define _ASM_X86_KVM_X86_EMULATE_H
6aa8b732	13
38ba30ba GN	14	#include <asm/desc_defs.h>
38ba30ba GN	15
6aa8b732 AK	16	struct x86_emulate_ctxt;
6aa8b732 AK	17
da9cb575 AK	18	struct x86_exception {
	19	u8 vector;
	20	bool error_code_valid;
	21	u16 error_code;
6389ee94 AK	22	bool nested_page_fault;
6389ee94 AK	23	u64 address; /* cr2 or nested page fault gpa */
da9cb575 AK	24	};
da9cb575 AK	25
6aa8b732 AK	26	/*
	27	* x86_emulate_ops:
	28	*
	29	* These operations represent the instruction emulator's interface to memory.
	30	* There are two categories of operation: those that act on ordinary memory
	31	* regions (*_std), and those that act on memory regions known to require
	32	* special treatment or emulation (*_emulated).
	33	*
	34	* The emulator assumes that an instruction accesses only one 'emulated memory'
	35	* location, that this location is the given linear faulting address (cr2), and
	36	* that this is one of the instruction's data operands. Instruction fetches and
	37	* stack operations are assumed never to access emulated memory. The emulator
	38	* automatically deduces which operand of a string-move operation is accessing
	39	* emulated memory, and assumes that the other operand accesses normal memory.
	40	*
	41	* NOTES:
	42	* 1. The emulator isn't very smart about emulated vs. standard memory.
	43	* 'Emulated memory' access addresses should be checked for sanity.
	44	* 'Normal memory' accesses may fault, and the caller must arrange to
	45	* detect and handle reentrancy into the emulator via recursive faults.
	46	* Accesses may be unaligned and may cross page boundaries.
	47	* 2. If the access fails (cannot emulate, or a standard access faults) then
	48	* it is up to the memop to propagate the fault to the guest VM via
	49	* some out-of-band mechanism, unknown to the emulator. The memop signals
	50	* failure by returning X86EMUL_PROPAGATE_FAULT to the emulator, which will
	51	* then immediately bail.
	52	* 3. Valid access sizes are 1, 2, 4 and 8 bytes. On x86/32 systems only
	53	* cmpxchg8b_emulated need support 8-byte accesses.
	54	* 4. The emulator cannot handle 64-bit mode emulation on an x86/32 system.
	55	*/
	56	/* Access completed successfully: continue emulation as normal. */
	57	#define X86EMUL_CONTINUE 0
	58	/* Access is unhandleable: bail from emulation and return error to caller. */
	59	#define X86EMUL_UNHANDLEABLE 1
	60	/* Terminate emulation but return success to the caller. */
	61	#define X86EMUL_PROPAGATE_FAULT 2 /* propagate a generated fault to guest */
e680080e GN	62	#define X86EMUL_RETRY_INSTR 3 /* retry the instruction for some reason */
e680080e GN	63	#define X86EMUL_CMPXCHG_FAILED 4 /* cmpxchg did not see expected value */
c3cd7ffa	64	#define X86EMUL_IO_NEEDED 5 /* IO is needed to complete emulation */
e680080e	65
6aa8b732 AK	66	struct x86_emulate_ops {
	67	/*
	68	* read_std: Read bytes of standard (non-emulated/special) memory.
1871c602	69	* Used for descriptor reading.
6aa8b732 AK	70	* @addr: [IN ] Linear address from which to read.
	71	* @val: [OUT] Value read from memory, zero-extended to 'u_long'.
	72	* @bytes: [IN ] Number of bytes to read from memory.
	73	*/
4c690a1e	74	int (read_std)(unsigned long addr, void val,
bcc55cba AK	75	unsigned int bytes, struct kvm_vcpu *vcpu,
bcc55cba AK	76	struct x86_exception *fault);
1871c602	77
2dafc6c2 GN	78	/*
	79	* write_std: Write bytes of standard (non-emulated/special) memory.
	80	* Used for descriptor writing.
	81	* @addr: [IN ] Linear address to which to write.
	82	* @val: [OUT] Value write to memory, zero-extended to 'u_long'.
	83	* @bytes: [IN ] Number of bytes to write to memory.
	84	*/
	85	int (write_std)(unsigned long addr, void val,
bcc55cba AK	86	unsigned int bytes, struct kvm_vcpu *vcpu,
bcc55cba AK	87	struct x86_exception *fault);
1871c602 GN	88	/*
	89	* fetch: Read bytes of standard (non-emulated/special) memory.
	90	* Used for instruction fetch.
	91	* @addr: [IN ] Linear address from which to read.
	92	* @val: [OUT] Value read from memory, zero-extended to 'u_long'.
	93	* @bytes: [IN ] Number of bytes to read from memory.
	94	*/
	95	int (fetch)(unsigned long addr, void val,
bcc55cba AK	96	unsigned int bytes, struct kvm_vcpu *vcpu,
bcc55cba AK	97	struct x86_exception *fault);
6aa8b732 AK	98
	99	/*
	100	* read_emulated: Read bytes from emulated/special memory area.
	101	* @addr: [IN ] Linear address from which to read.
	102	* @val: [OUT] Value read from memory, zero-extended to 'u_long'.
	103	* @bytes: [IN ] Number of bytes to read from memory.
	104	*/
0c7825e6 JP	105	int (*read_emulated)(unsigned long addr,
	106	void *val,
	107	unsigned int bytes,
bcc55cba	108	struct x86_exception *fault,
0c7825e6	109	struct kvm_vcpu *vcpu);
6aa8b732 AK	110
6aa8b732 AK	111	/*
0d178975	112	* write_emulated: Write bytes to emulated/special memory area.
6aa8b732 AK	113	* @addr: [IN ] Linear address to which to write.
	114	* @val: [IN ] Value to write to memory (low-order bytes used as
	115	* required).
	116	* @bytes: [IN ] Number of bytes to write to memory.
	117	*/
0c7825e6 JP	118	int (*write_emulated)(unsigned long addr,
	119	const void *val,
	120	unsigned int bytes,
bcc55cba	121	struct x86_exception *fault,
0c7825e6	122	struct kvm_vcpu *vcpu);
6aa8b732 AK	123
	124	/*
	125	* cmpxchg_emulated: Emulate an atomic (LOCKed) CMPXCHG operation on an
	126	* emulated/special memory area.
	127	* @addr: [IN ] Linear address to access.
	128	* @old: [IN ] Value expected to be current at @addr.
	129	* @new: [IN ] Value to write to @addr.
	130	* @bytes: [IN ] Number of bytes to access using CMPXCHG.
	131	*/
0c7825e6 JP	132	int (*cmpxchg_emulated)(unsigned long addr,
	133	const void *old,
	134	const void *new,
	135	unsigned int bytes,
bcc55cba	136	struct x86_exception *fault,
0c7825e6	137	struct kvm_vcpu *vcpu);
cf8f70bf GN	138
	139	int (pio_in_emulated)(int size, unsigned short port, void val,
	140	unsigned int count, struct kvm_vcpu *vcpu);
	141
	142	int (pio_out_emulated)(int size, unsigned short port, const void val,
	143	unsigned int count, struct kvm_vcpu *vcpu);
	144
5601d05b	145	bool (get_cached_descriptor)(struct desc_struct desc, u32 *base3,
2dafc6c2	146	int seg, struct kvm_vcpu *vcpu);
5601d05b	147	void (set_cached_descriptor)(struct desc_struct desc, u32 base3,
2dafc6c2 GN	148	int seg, struct kvm_vcpu *vcpu);
	149	u16 (get_segment_selector)(int seg, struct kvm_vcpu vcpu);
	150	void (set_segment_selector)(u16 sel, int seg, struct kvm_vcpu vcpu);
5951c442	151	unsigned long (get_cached_segment_base)(int seg, struct kvm_vcpu vcpu);
2dafc6c2	152	void (get_gdt)(struct desc_ptr dt, struct kvm_vcpu *vcpu);
160ce1f1	153	void (get_idt)(struct desc_ptr dt, struct kvm_vcpu *vcpu);
52a46617	154	ulong (get_cr)(int cr, struct kvm_vcpu vcpu);
0f12244f	155	int (set_cr)(int cr, ulong val, struct kvm_vcpu vcpu);
9c537244	156	int (cpl)(struct kvm_vcpu vcpu);
35aa5375 GN	157	int (get_dr)(int dr, unsigned long dest, struct kvm_vcpu *vcpu);
35aa5375 GN	158	int (set_dr)(int dr, unsigned long value, struct kvm_vcpu vcpu);
3fb1b5db GN	159	int (set_msr)(struct kvm_vcpu vcpu, u32 msr_index, u64 data);
3fb1b5db GN	160	int (get_msr)(struct kvm_vcpu vcpu, u32 msr_index, u64 *pdata);
5037f6f3 AK	161	void (get_fpu)(struct x86_emulate_ctxt ctxt); /* disables preempt */
5037f6f3 AK	162	void (put_fpu)(struct x86_emulate_ctxt ctxt); /* reenables preempt */
6aa8b732 AK	163	};
6aa8b732 AK	164
1253791d AK	165	typedef u32 __attribute__((vector_size(16))) sse128_t;
1253791d AK	166
e4e03ded LV	167	/* Type, address-of, and value of an instruction's operand. */
e4e03ded LV	168	struct operand {
1253791d	169	enum { OP_REG, OP_MEM, OP_IMM, OP_XMM, OP_NONE } type;
e4e03ded	170	unsigned int bytes;
16518d5a AK	171	union {
	172	unsigned long orig_val;
	173	u64 orig_val64;
	174	};
1a6440ae AK	175	union {
1a6440ae AK	176	unsigned long *reg;
90de84f5 AK	177	struct segmented_address {
	178	ulong ea;
	179	unsigned seg;
	180	} mem;
1253791d	181	unsigned xmm;
1a6440ae	182	} addr;
414e6277 GN	183	union {
414e6277 GN	184	unsigned long val;
16518d5a	185	u64 val64;
414e6277	186	char valptr[sizeof(unsigned long) + 2];
1253791d	187	sse128_t vec_val;
414e6277	188	};
e4e03ded LV	189	};
e4e03ded LV	190
62266869 AK	191	struct fetch_cache {
	192	u8 data[15];
	193	unsigned long start;
	194	unsigned long end;
	195	};
	196
7b262e90 GN	197	struct read_cache {
	198	u8 data[1024];
	199	unsigned long pos;
	200	unsigned long end;
	201	};
	202
e4e03ded LV	203	struct decode_cache {
	204	u8 twobyte;
	205	u8 b;
	206	u8 lock_prefix;
	207	u8 rep_prefix;
	208	u8 op_bytes;
	209	u8 ad_bytes;
33615aa9	210	u8 rex_prefix;
e4e03ded	211	struct operand src;
0dc8d10f	212	struct operand src2;
e4e03ded	213	struct operand dst;
7a5b56df AK	214	bool has_seg_override;
7a5b56df AK	215	u8 seg_override;
e4e03ded	216	unsigned int d;
ef65c889	217	int (execute)(struct x86_emulate_ctxt ctxt);
e4e03ded	218	unsigned long regs[NR_VCPU_REGS];
063db061	219	unsigned long eip;
e4e03ded LV	220	/* modrm */
	221	u8 modrm;
	222	u8 modrm_mod;
	223	u8 modrm_reg;
	224	u8 modrm_rm;
09ee57cd	225	u8 modrm_seg;
f5b4edcd	226	bool rip_relative;
62266869	227	struct fetch_cache fetch;
7b262e90	228	struct read_cache io_read;
9de41573	229	struct read_cache mem_read;
e4e03ded LV	230	};
e4e03ded LV	231
6aa8b732	232	struct x86_emulate_ctxt {
9aabc88f AK	233	struct x86_emulate_ops *ops;
9aabc88f AK	234
6aa8b732 AK	235	/* Register state before/after emulation. */
	236	struct kvm_vcpu *vcpu;
	237
6aa8b732	238	unsigned long eflags;
063db061	239	unsigned long eip; /* eip before instruction emulation */
6aa8b732 AK	240	/* Emulated execution mode, represented by an X86EMUL_MODE value. */
6aa8b732 AK	241	int mode;
7a5b56df	242	u32 cs_base;
e4e03ded	243
310b5d30 GC	244	/* interruptibility state, as a result of execution of STI or MOV SS */
	245	int interruptibility;
	246
4fc40f07	247	bool perm_ok; /* do not check permissions if true */
d867162c	248	bool only_vendor_specific_insn;
54b8486f	249
da9cb575 AK	250	bool have_exception;
da9cb575 AK	251	struct x86_exception exception;
54b8486f	252
e4e03ded	253	/* decode cache */
e4e03ded	254	struct decode_cache decode;
6aa8b732 AK	255	};
6aa8b732 AK	256
90e0a28f	257	/* Repeat String Operation Prefix */
1d6b114f AK	258	#define REPE_PREFIX 0xf3
1d6b114f AK	259	#define REPNE_PREFIX 0xf2
90e0a28f	260
6aa8b732 AK	261	/* Execution mode, passed to the emulator. */
6aa8b732 AK	262	#define X86EMUL_MODE_REAL 0 /* Real mode. */
a0044755	263	#define X86EMUL_MODE_VM86 1 /* Virtual 8086 mode. */
6aa8b732 AK	264	#define X86EMUL_MODE_PROT16 2 /* 16-bit protected mode. */
	265	#define X86EMUL_MODE_PROT32 4 /* 32-bit protected mode. */
	266	#define X86EMUL_MODE_PROT64 8 /* 64-bit (long) mode. */
	267
	268	/* Host execution mode. */
d73fa29a	269	#if defined(CONFIG_X86_32)
6aa8b732	270	#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32
05b3e0c2	271	#elif defined(CONFIG_X86_64)
6aa8b732 AK	272	#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT64
	273	#endif
	274
dc25e89e	275	int x86_decode_insn(struct x86_emulate_ctxt ctxt, void insn, int insn_len);
d2ddd1c4 GN	276	#define EMULATION_FAILED -1
	277	#define EMULATION_OK 0
	278	#define EMULATION_RESTART 1
9aabc88f	279	int x86_emulate_insn(struct x86_emulate_ctxt *ctxt);
38ba30ba	280	int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
e269fb21 JK	281	u16 tss_selector, int reason,
e269fb21 JK	282	bool has_error_code, u32 error_code);
4ab8e024 MG	283	int emulate_int_real(struct x86_emulate_ctxt *ctxt,
4ab8e024 MG	284	struct x86_emulate_ops *ops, int irq);
1965aae3	285	#endif /* _ASM_X86_KVM_X86_EMULATE_H */