/*
* This file is subject to the terms and conditions of the GNU General Public
* License.  See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
* Authors: Sanjay Lal <sanjayl@kymasys.com>
*/

#ifndef __MIPS_KVM_HOST_H__
#define __MIPS_KVM_HOST_H__

#include <linux/mutex.h>
#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/kvm.h>
#include <linux/kvm_types.h>
#include <linux/threads.h>
#include <linux/spinlock.h>


#define KVM_MAX_VCPUS		1
#define KVM_USER_MEM_SLOTS	8
/* memory slots that does not exposed to userspace */
#define KVM_PRIVATE_MEM_SLOTS 	0

#define KVM_COALESCED_MMIO_PAGE_OFFSET 1

/* Don't support huge pages */
#define KVM_HPAGE_GFN_SHIFT(x)	0

/* We don't currently support large pages. */
#define KVM_NR_PAGE_SIZES	1
#define KVM_PAGES_PER_HPAGE(x)	1


/* Special address that contains the comm page, used for reducing # of traps */
#define KVM_GUEST_COMMPAGE_ADDR     0x0

#define KVM_GUEST_KERNEL_MODE(vcpu)	((kvm_read_c0_guest_status(vcpu->arch.cop0) & (ST0_EXL | ST0_ERL)) || \
					((kvm_read_c0_guest_status(vcpu->arch.cop0) & KSU_USER) == 0))

#define KVM_GUEST_KUSEG             0x00000000UL
#define KVM_GUEST_KSEG0             0x40000000UL
#define KVM_GUEST_KSEG23            0x60000000UL
#define KVM_GUEST_KSEGX(a)          ((_ACAST32_(a)) & 0x60000000)
#define KVM_GUEST_CPHYSADDR(a)      ((_ACAST32_(a)) & 0x1fffffff)

#define KVM_GUEST_CKSEG0ADDR(a)		(KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG0)
#define KVM_GUEST_CKSEG1ADDR(a)		(KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG1)
#define KVM_GUEST_CKSEG23ADDR(a)	(KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG23)

/*
 * Map an address to a certain kernel segment
 */
#define KVM_GUEST_KSEG0ADDR(a)		(KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG0)
#define KVM_GUEST_KSEG1ADDR(a)		(KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG1)
#define KVM_GUEST_KSEG23ADDR(a)		(KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG23)

#define KVM_INVALID_PAGE            0xdeadbeef
#define KVM_INVALID_INST            0xdeadbeef
#define KVM_INVALID_ADDR            0xdeadbeef

#define KVM_MALTA_GUEST_RTC_ADDR    0xb8000070UL

#define GUEST_TICKS_PER_JIFFY (40000000/HZ)
#define MS_TO_NS(x) (x * 1E6L)

#define CAUSEB_DC       27
#define CAUSEF_DC       (_ULCAST_(1)   << 27)

struct kvm;
struct kvm_run;
struct kvm_vcpu;
struct kvm_interrupt;

extern atomic_t kvm_mips_instance;
extern pfn_t(*kvm_mips_gfn_to_pfn) (struct kvm *kvm, gfn_t gfn);
extern void (*kvm_mips_release_pfn_clean) (pfn_t pfn);
extern bool(*kvm_mips_is_error_pfn) (pfn_t pfn);

struct kvm_vm_stat {
	u32 remote_tlb_flush;
};

struct kvm_vcpu_stat {
	u32 wait_exits;
	u32 cache_exits;
	u32 signal_exits;
	u32 int_exits;
	u32 cop_unusable_exits;
	u32 tlbmod_exits;
	u32 tlbmiss_ld_exits;
	u32 tlbmiss_st_exits;
	u32 addrerr_st_exits;
	u32 addrerr_ld_exits;
	u32 syscall_exits;
	u32 resvd_inst_exits;
	u32 break_inst_exits;
	u32 flush_dcache_exits;
	u32 halt_wakeup;
};

enum kvm_mips_exit_types {
	WAIT_EXITS,
	CACHE_EXITS,
	SIGNAL_EXITS,
	INT_EXITS,
	COP_UNUSABLE_EXITS,
	TLBMOD_EXITS,
	TLBMISS_LD_EXITS,
	TLBMISS_ST_EXITS,
	ADDRERR_ST_EXITS,
	ADDRERR_LD_EXITS,
	SYSCALL_EXITS,
	RESVD_INST_EXITS,
	BREAK_INST_EXITS,
	FLUSH_DCACHE_EXITS,
	MAX_KVM_MIPS_EXIT_TYPES
};

struct kvm_arch_memory_slot {
};

struct kvm_arch {
	/* Guest GVA->HPA page table */
	unsigned long *guest_pmap;
	unsigned long guest_pmap_npages;

	/* Wired host TLB used for the commpage */
	int commpage_tlb;
};

#define N_MIPS_COPROC_REGS      32
#define N_MIPS_COPROC_SEL   	8

struct mips_coproc {
	unsigned long reg[N_MIPS_COPROC_REGS][N_MIPS_COPROC_SEL];
#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
	unsigned long stat[N_MIPS_COPROC_REGS][N_MIPS_COPROC_SEL];
#endif
};

/*
 * Coprocessor 0 register names
 */
#define	MIPS_CP0_TLB_INDEX	    0
#define	MIPS_CP0_TLB_RANDOM	    1
#define	MIPS_CP0_TLB_LOW	    2
#define	MIPS_CP0_TLB_LO0	    2
#define	MIPS_CP0_TLB_LO1	    3
#define	MIPS_CP0_TLB_CONTEXT	4
#define	MIPS_CP0_TLB_PG_MASK	5
#define	MIPS_CP0_TLB_WIRED	    6
#define	MIPS_CP0_HWRENA 	    7
#define	MIPS_CP0_BAD_VADDR	    8
#define	MIPS_CP0_COUNT	        9
#define	MIPS_CP0_TLB_HI	        10
#define	MIPS_CP0_COMPARE	    11
#define	MIPS_CP0_STATUS	        12
#define	MIPS_CP0_CAUSE	        13
#define	MIPS_CP0_EXC_PC	        14
#define	MIPS_CP0_PRID		    15
#define	MIPS_CP0_CONFIG	        16
#define	MIPS_CP0_LLADDR	        17
#define	MIPS_CP0_WATCH_LO	    18
#define	MIPS_CP0_WATCH_HI	    19
#define	MIPS_CP0_TLB_XCONTEXT   20
#define	MIPS_CP0_ECC		    26
#define	MIPS_CP0_CACHE_ERR	    27
#define	MIPS_CP0_TAG_LO	        28
#define	MIPS_CP0_TAG_HI	        29
#define	MIPS_CP0_ERROR_PC	    30
#define	MIPS_CP0_DEBUG	        23
#define	MIPS_CP0_DEPC		    24
#define	MIPS_CP0_PERFCNT	    25
#define	MIPS_CP0_ERRCTL         26
#define	MIPS_CP0_DATA_LO	    28
#define	MIPS_CP0_DATA_HI	    29
#define	MIPS_CP0_DESAVE	        31

#define MIPS_CP0_CONFIG_SEL	    0
#define MIPS_CP0_CONFIG1_SEL    1
#define MIPS_CP0_CONFIG2_SEL    2
#define MIPS_CP0_CONFIG3_SEL    3

/* Config0 register bits */
#define CP0C0_M    31
#define CP0C0_K23  28
#define CP0C0_KU   25
#define CP0C0_MDU  20
#define CP0C0_MM   17
#define CP0C0_BM   16
#define CP0C0_BE   15
#define CP0C0_AT   13
#define CP0C0_AR   10
#define CP0C0_MT   7
#define CP0C0_VI   3
#define CP0C0_K0   0

/* Config1 register bits */
#define CP0C1_M    31
#define CP0C1_MMU  25
#define CP0C1_IS   22
#define CP0C1_IL   19
#define CP0C1_IA   16
#define CP0C1_DS   13
#define CP0C1_DL   10
#define CP0C1_DA   7
#define CP0C1_C2   6
#define CP0C1_MD   5
#define CP0C1_PC   4
#define CP0C1_WR   3
#define CP0C1_CA   2
#define CP0C1_EP   1
#define CP0C1_FP   0

/* Config2 Register bits */
#define CP0C2_M    31
#define CP0C2_TU   28
#define CP0C2_TS   24
#define CP0C2_TL   20
#define CP0C2_TA   16
#define CP0C2_SU   12
#define CP0C2_SS   8
#define CP0C2_SL   4
#define CP0C2_SA   0

/* Config3 Register bits */
#define CP0C3_M    31
#define CP0C3_ISA_ON_EXC 16
#define CP0C3_ULRI  13
#define CP0C3_DSPP 10
#define CP0C3_LPA  7
#define CP0C3_VEIC 6
#define CP0C3_VInt 5
#define CP0C3_SP   4
#define CP0C3_MT   2
#define CP0C3_SM   1
#define CP0C3_TL   0

/* Have config1, Cacheable, noncoherent, write-back, write allocate*/
#define MIPS_CONFIG0                                              \
  ((1 << CP0C0_M) | (0x3 << CP0C0_K0))

/* Have config2, no coprocessor2 attached, no MDMX support attached,
   no performance counters, watch registers present,
   no code compression, EJTAG present, no FPU, no watch registers */
#define MIPS_CONFIG1                                              \
((1 << CP0C1_M) |                                                 \
 (0 << CP0C1_C2) | (0 << CP0C1_MD) | (0 << CP0C1_PC) |            \
 (0 << CP0C1_WR) | (0 << CP0C1_CA) | (1 << CP0C1_EP) |            \
 (0 << CP0C1_FP))

/* Have config3, no tertiary/secondary caches implemented */
#define MIPS_CONFIG2                                              \
((1 << CP0C2_M))

/* No config4, no DSP ASE, no large physaddr (PABITS),
   no external interrupt controller, no vectored interrupts,
   no 1kb pages, no SmartMIPS ASE, no trace logic */
#define MIPS_CONFIG3                                              \
((0 << CP0C3_M) | (0 << CP0C3_DSPP) | (0 << CP0C3_LPA) |          \
 (0 << CP0C3_VEIC) | (0 << CP0C3_VInt) | (0 << CP0C3_SP) |        \
 (0 << CP0C3_SM) | (0 << CP0C3_TL))

/* MMU types, the first four entries have the same layout as the
   CP0C0_MT field.  */
enum mips_mmu_types {
	MMU_TYPE_NONE,
	MMU_TYPE_R4000,
	MMU_TYPE_RESERVED,
	MMU_TYPE_FMT,
	MMU_TYPE_R3000,
	MMU_TYPE_R6000,
	MMU_TYPE_R8000
};

/*
 * Trap codes
 */
#define T_INT           0	/* Interrupt pending */
#define T_TLB_MOD       1	/* TLB modified fault */
#define T_TLB_LD_MISS       2	/* TLB miss on load or ifetch */
#define T_TLB_ST_MISS       3	/* TLB miss on a store */
#define T_ADDR_ERR_LD       4	/* Address error on a load or ifetch */
#define T_ADDR_ERR_ST       5	/* Address error on a store */
#define T_BUS_ERR_IFETCH    6	/* Bus error on an ifetch */
#define T_BUS_ERR_LD_ST     7	/* Bus error on a load or store */
#define T_SYSCALL       8	/* System call */
#define T_BREAK         9	/* Breakpoint */
#define T_RES_INST      10	/* Reserved instruction exception */
#define T_COP_UNUSABLE      11	/* Coprocessor unusable */
#define T_OVFLOW        12	/* Arithmetic overflow */

/*
 * Trap definitions added for r4000 port.
 */
#define T_TRAP          13	/* Trap instruction */
#define T_VCEI          14	/* Virtual coherency exception */
#define T_FPE           15	/* Floating point exception */
#define T_WATCH         23	/* Watch address reference */
#define T_VCED          31	/* Virtual coherency data */

/* Resume Flags */
#define RESUME_FLAG_DR          (1<<0)	/* Reload guest nonvolatile state? */
#define RESUME_FLAG_HOST        (1<<1)	/* Resume host? */

#define RESUME_GUEST            0
#define RESUME_GUEST_DR         RESUME_FLAG_DR
#define RESUME_HOST             RESUME_FLAG_HOST

enum emulation_result {
	EMULATE_DONE,		/* no further processing */
	EMULATE_DO_MMIO,	/* kvm_run filled with MMIO request */
	EMULATE_FAIL,		/* can't emulate this instruction */
	EMULATE_WAIT,		/* WAIT instruction */
	EMULATE_PRIV_FAIL,
};

#define MIPS3_PG_G  0x00000001	/* Global; ignore ASID if in lo0 & lo1 */
#define MIPS3_PG_V  0x00000002	/* Valid */
#define MIPS3_PG_NV 0x00000000
#define MIPS3_PG_D  0x00000004	/* Dirty */

#define mips3_paddr_to_tlbpfn(x) \
    (((unsigned long)(x) >> MIPS3_PG_SHIFT) & MIPS3_PG_FRAME)
#define mips3_tlbpfn_to_paddr(x) \
    ((unsigned long)((x) & MIPS3_PG_FRAME) << MIPS3_PG_SHIFT)

#define MIPS3_PG_SHIFT      6
#define MIPS3_PG_FRAME      0x3fffffc0

#define VPN2_MASK           0xffffe000
#define TLB_IS_GLOBAL(x)    (((x).tlb_lo0 & MIPS3_PG_G) && ((x).tlb_lo1 & MIPS3_PG_G))
#define TLB_VPN2(x)         ((x).tlb_hi & VPN2_MASK)
#define TLB_ASID(x)         ((x).tlb_hi & ASID_MASK)
#define TLB_IS_VALID(x, va) (((va) & (1 << PAGE_SHIFT)) ? ((x).tlb_lo1 & MIPS3_PG_V) : ((x).tlb_lo0 & MIPS3_PG_V))

struct kvm_mips_tlb {
	long tlb_mask;
	long tlb_hi;
	long tlb_lo0;
	long tlb_lo1;
};

#define KVM_MIPS_GUEST_TLB_SIZE     64
struct kvm_vcpu_arch {
	void *host_ebase, *guest_ebase;
	unsigned long host_stack;
	unsigned long host_gp;

	/* Host CP0 registers used when handling exits from guest */
	unsigned long host_cp0_badvaddr;
	unsigned long host_cp0_cause;
	unsigned long host_cp0_epc;
	unsigned long host_cp0_entryhi;
	uint32_t guest_inst;

	/* GPRS */
	unsigned long gprs[32];
	unsigned long hi;
	unsigned long lo;
	unsigned long pc;

	/* FPU State */
	struct mips_fpu_struct fpu;

	/* COP0 State */
	struct mips_coproc *cop0;

	/* Host KSEG0 address of the EI/DI offset */
	void *kseg0_commpage;

	u32 io_gpr;		/* GPR used as IO source/target */

	/* Used to calibrate the virutal count register for the guest */
	int32_t host_cp0_count;

	/* Bitmask of exceptions that are pending */
	unsigned long pending_exceptions;

	/* Bitmask of pending exceptions to be cleared */
	unsigned long pending_exceptions_clr;

	unsigned long pending_load_cause;

	/* Save/Restore the entryhi register when are are preempted/scheduled back in */
	unsigned long preempt_entryhi;

	/* S/W Based TLB for guest */
	struct kvm_mips_tlb guest_tlb[KVM_MIPS_GUEST_TLB_SIZE];

	/* Cached guest kernel/user ASIDs */
	uint32_t guest_user_asid[NR_CPUS];
	uint32_t guest_kernel_asid[NR_CPUS];
	struct mm_struct guest_kernel_mm, guest_user_mm;

	struct kvm_mips_tlb shadow_tlb[NR_CPUS][KVM_MIPS_GUEST_TLB_SIZE];


	struct hrtimer comparecount_timer;

	int last_sched_cpu;

	/* WAIT executed */
	int wait;
};


#define kvm_read_c0_guest_index(cop0)               (cop0->reg[MIPS_CP0_TLB_INDEX][0])
#define kvm_write_c0_guest_index(cop0, val)         (cop0->reg[MIPS_CP0_TLB_INDEX][0] = val)
#define kvm_read_c0_guest_entrylo0(cop0)            (cop0->reg[MIPS_CP0_TLB_LO0][0])
#define kvm_read_c0_guest_entrylo1(cop0)            (cop0->reg[MIPS_CP0_TLB_LO1][0])
#define kvm_read_c0_guest_context(cop0)             (cop0->reg[MIPS_CP0_TLB_CONTEXT][0])
#define kvm_write_c0_guest_context(cop0, val)       (cop0->reg[MIPS_CP0_TLB_CONTEXT][0] = (val))
#define kvm_read_c0_guest_userlocal(cop0)           (cop0->reg[MIPS_CP0_TLB_CONTEXT][2])
#define kvm_read_c0_guest_pagemask(cop0)            (cop0->reg[MIPS_CP0_TLB_PG_MASK][0])
#define kvm_write_c0_guest_pagemask(cop0, val)      (cop0->reg[MIPS_CP0_TLB_PG_MASK][0] = (val))
#define kvm_read_c0_guest_wired(cop0)               (cop0->reg[MIPS_CP0_TLB_WIRED][0])
#define kvm_write_c0_guest_wired(cop0, val)         (cop0->reg[MIPS_CP0_TLB_WIRED][0] = (val))
#define kvm_read_c0_guest_badvaddr(cop0)            (cop0->reg[MIPS_CP0_BAD_VADDR][0])
#define kvm_write_c0_guest_badvaddr(cop0, val)      (cop0->reg[MIPS_CP0_BAD_VADDR][0] = (val))
#define kvm_read_c0_guest_count(cop0)               (cop0->reg[MIPS_CP0_COUNT][0])
#define kvm_write_c0_guest_count(cop0, val)         (cop0->reg[MIPS_CP0_COUNT][0] = (val))
#define kvm_read_c0_guest_entryhi(cop0)             (cop0->reg[MIPS_CP0_TLB_HI][0])
#define kvm_write_c0_guest_entryhi(cop0, val)       (cop0->reg[MIPS_CP0_TLB_HI][0] = (val))
#define kvm_read_c0_guest_compare(cop0)             (cop0->reg[MIPS_CP0_COMPARE][0])
#define kvm_write_c0_guest_compare(cop0, val)       (cop0->reg[MIPS_CP0_COMPARE][0] = (val))
#define kvm_read_c0_guest_status(cop0)              (cop0->reg[MIPS_CP0_STATUS][0])
#define kvm_write_c0_guest_status(cop0, val)        (cop0->reg[MIPS_CP0_STATUS][0] = (val))
#define kvm_read_c0_guest_intctl(cop0)              (cop0->reg[MIPS_CP0_STATUS][1])
#define kvm_write_c0_guest_intctl(cop0, val)        (cop0->reg[MIPS_CP0_STATUS][1] = (val))
#define kvm_read_c0_guest_cause(cop0)               (cop0->reg[MIPS_CP0_CAUSE][0])
#define kvm_write_c0_guest_cause(cop0, val)         (cop0->reg[MIPS_CP0_CAUSE][0] = (val))
#define kvm_read_c0_guest_epc(cop0)                 (cop0->reg[MIPS_CP0_EXC_PC][0])
#define kvm_write_c0_guest_epc(cop0, val)           (cop0->reg[MIPS_CP0_EXC_PC][0] = (val))
#define kvm_read_c0_guest_prid(cop0)                (cop0->reg[MIPS_CP0_PRID][0])
#define kvm_write_c0_guest_prid(cop0, val)          (cop0->reg[MIPS_CP0_PRID][0] = (val))
#define kvm_read_c0_guest_ebase(cop0)               (cop0->reg[MIPS_CP0_PRID][1])
#define kvm_write_c0_guest_ebase(cop0, val)         (cop0->reg[MIPS_CP0_PRID][1] = (val))
#define kvm_read_c0_guest_config(cop0)              (cop0->reg[MIPS_CP0_CONFIG][0])
#define kvm_read_c0_guest_config1(cop0)             (cop0->reg[MIPS_CP0_CONFIG][1])
#define kvm_read_c0_guest_config2(cop0)             (cop0->reg[MIPS_CP0_CONFIG][2])
#define kvm_read_c0_guest_config3(cop0)             (cop0->reg[MIPS_CP0_CONFIG][3])
#define kvm_read_c0_guest_config7(cop0)             (cop0->reg[MIPS_CP0_CONFIG][7])
#define kvm_write_c0_guest_config(cop0, val)        (cop0->reg[MIPS_CP0_CONFIG][0] = (val))
#define kvm_write_c0_guest_config1(cop0, val)       (cop0->reg[MIPS_CP0_CONFIG][1] = (val))
#define kvm_write_c0_guest_config2(cop0, val)       (cop0->reg[MIPS_CP0_CONFIG][2] = (val))
#define kvm_write_c0_guest_config3(cop0, val)       (cop0->reg[MIPS_CP0_CONFIG][3] = (val))
#define kvm_write_c0_guest_config7(cop0, val)       (cop0->reg[MIPS_CP0_CONFIG][7] = (val))
#define kvm_read_c0_guest_errorepc(cop0)            (cop0->reg[MIPS_CP0_ERROR_PC][0])
#define kvm_write_c0_guest_errorepc(cop0, val)      (cop0->reg[MIPS_CP0_ERROR_PC][0] = (val))

#define kvm_set_c0_guest_status(cop0, val)          (cop0->reg[MIPS_CP0_STATUS][0] |= (val))
#define kvm_clear_c0_guest_status(cop0, val)        (cop0->reg[MIPS_CP0_STATUS][0] &= ~(val))
#define kvm_set_c0_guest_cause(cop0, val)           (cop0->reg[MIPS_CP0_CAUSE][0] |= (val))
#define kvm_clear_c0_guest_cause(cop0, val)         (cop0->reg[MIPS_CP0_CAUSE][0] &= ~(val))
#define kvm_change_c0_guest_cause(cop0, change, val)  \
{                                                     \
    kvm_clear_c0_guest_cause(cop0, change);           \
    kvm_set_c0_guest_cause(cop0, ((val) & (change))); \
}
#define kvm_set_c0_guest_ebase(cop0, val)           (cop0->reg[MIPS_CP0_PRID][1] |= (val))
#define kvm_clear_c0_guest_ebase(cop0, val)         (cop0->reg[MIPS_CP0_PRID][1] &= ~(val))
#define kvm_change_c0_guest_ebase(cop0, change, val)  \
{                                                     \
    kvm_clear_c0_guest_ebase(cop0, change);           \
    kvm_set_c0_guest_ebase(cop0, ((val) & (change))); \
}


struct kvm_mips_callbacks {
	int (*handle_cop_unusable) (struct kvm_vcpu *vcpu);
	int (*handle_tlb_mod) (struct kvm_vcpu *vcpu);
	int (*handle_tlb_ld_miss) (struct kvm_vcpu *vcpu);
	int (*handle_tlb_st_miss) (struct kvm_vcpu *vcpu);
	int (*handle_addr_err_st) (struct kvm_vcpu *vcpu);
	int (*handle_addr_err_ld) (struct kvm_vcpu *vcpu);
	int (*handle_syscall) (struct kvm_vcpu *vcpu);
	int (*handle_res_inst) (struct kvm_vcpu *vcpu);
	int (*handle_break) (struct kvm_vcpu *vcpu);
	int (*vm_init) (struct kvm *kvm);
	int (*vcpu_init) (struct kvm_vcpu *vcpu);
	int (*vcpu_setup) (struct kvm_vcpu *vcpu);
	 gpa_t(*gva_to_gpa) (gva_t gva);
	void (*queue_timer_int) (struct kvm_vcpu *vcpu);
	void (*dequeue_timer_int) (struct kvm_vcpu *vcpu);
	void (*queue_io_int) (struct kvm_vcpu *vcpu,
			      struct kvm_mips_interrupt *irq);
	void (*dequeue_io_int) (struct kvm_vcpu *vcpu,
				struct kvm_mips_interrupt *irq);
	int (*irq_deliver) (struct kvm_vcpu *vcpu, unsigned int priority,
			    uint32_t cause);
	int (*irq_clear) (struct kvm_vcpu *vcpu, unsigned int priority,
			  uint32_t cause);
};
extern struct kvm_mips_callbacks *kvm_mips_callbacks;
int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks);

/* Debug: dump vcpu state */
int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);

/* Trampoline ASM routine to start running in "Guest" context */
extern int __kvm_mips_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu);

/* TLB handling */
uint32_t kvm_get_kernel_asid(struct kvm_vcpu *vcpu);

uint32_t kvm_get_user_asid(struct kvm_vcpu *vcpu);

uint32_t kvm_get_commpage_asid (struct kvm_vcpu *vcpu);

extern int kvm_mips_handle_kseg0_tlb_fault(unsigned long badbaddr,
					   struct kvm_vcpu *vcpu);

extern int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
					      struct kvm_vcpu *vcpu);

extern int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
						struct kvm_mips_tlb *tlb,
						unsigned long *hpa0,
						unsigned long *hpa1);

extern enum emulation_result kvm_mips_handle_tlbmiss(unsigned long cause,
						     uint32_t *opc,
						     struct kvm_run *run,
						     struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_handle_tlbmod(unsigned long cause,
						    uint32_t *opc,
						    struct kvm_run *run,
						    struct kvm_vcpu *vcpu);

extern void kvm_mips_dump_host_tlbs(void);
extern void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu);
extern void kvm_mips_dump_shadow_tlbs(struct kvm_vcpu *vcpu);
extern void kvm_mips_flush_host_tlb(int skip_kseg0);
extern int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long entryhi);
extern int kvm_mips_host_tlb_inv_index(struct kvm_vcpu *vcpu, int index);

extern int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu,
				     unsigned long entryhi);
extern int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr);
extern unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
						   unsigned long gva);
extern void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
				    struct kvm_vcpu *vcpu);
extern void kvm_shadow_tlb_put(struct kvm_vcpu *vcpu);
extern void kvm_shadow_tlb_load(struct kvm_vcpu *vcpu);
extern void kvm_local_flush_tlb_all(void);
extern void kvm_mips_init_shadow_tlb(struct kvm_vcpu *vcpu);
extern void kvm_mips_alloc_new_mmu_context(struct kvm_vcpu *vcpu);
extern void kvm_mips_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
extern void kvm_mips_vcpu_put(struct kvm_vcpu *vcpu);

/* Emulation */
uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu);
enum emulation_result update_pc(struct kvm_vcpu *vcpu, uint32_t cause);

extern enum emulation_result kvm_mips_emulate_inst(unsigned long cause,
						   uint32_t *opc,
						   struct kvm_run *run,
						   struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_emulate_syscall(unsigned long cause,
						      uint32_t *opc,
						      struct kvm_run *run,
						      struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_emulate_tlbmiss_ld(unsigned long cause,
							 uint32_t *opc,
							 struct kvm_run *run,
							 struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_emulate_tlbinv_ld(unsigned long cause,
							uint32_t *opc,
							struct kvm_run *run,
							struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_emulate_tlbmiss_st(unsigned long cause,
							 uint32_t *opc,
							 struct kvm_run *run,
							 struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_emulate_tlbinv_st(unsigned long cause,
							uint32_t *opc,
							struct kvm_run *run,
							struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_emulate_tlbmod(unsigned long cause,
						     uint32_t *opc,
						     struct kvm_run *run,
						     struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_emulate_fpu_exc(unsigned long cause,
						      uint32_t *opc,
						      struct kvm_run *run,
						      struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_handle_ri(unsigned long cause,
						uint32_t *opc,
						struct kvm_run *run,
						struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_emulate_ri_exc(unsigned long cause,
						     uint32_t *opc,
						     struct kvm_run *run,
						     struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_emulate_bp_exc(unsigned long cause,
						     uint32_t *opc,
						     struct kvm_run *run,
						     struct kvm_vcpu *vcpu);

extern enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu,
							 struct kvm_run *run);

enum emulation_result kvm_mips_emulate_count(struct kvm_vcpu *vcpu);

enum emulation_result kvm_mips_check_privilege(unsigned long cause,
					       uint32_t *opc,
					       struct kvm_run *run,
					       struct kvm_vcpu *vcpu);

enum emulation_result kvm_mips_emulate_cache(uint32_t inst,
					     uint32_t *opc,
					     uint32_t cause,
					     struct kvm_run *run,
					     struct kvm_vcpu *vcpu);
enum emulation_result kvm_mips_emulate_CP0(uint32_t inst,
					   uint32_t *opc,
					   uint32_t cause,
					   struct kvm_run *run,
					   struct kvm_vcpu *vcpu);
enum emulation_result kvm_mips_emulate_store(uint32_t inst,
					     uint32_t cause,
					     struct kvm_run *run,
					     struct kvm_vcpu *vcpu);
enum emulation_result kvm_mips_emulate_load(uint32_t inst,
					    uint32_t cause,
					    struct kvm_run *run,
					    struct kvm_vcpu *vcpu);

/* Dynamic binary translation */
extern int kvm_mips_trans_cache_index(uint32_t inst, uint32_t *opc,
				      struct kvm_vcpu *vcpu);
extern int kvm_mips_trans_cache_va(uint32_t inst, uint32_t *opc,
				   struct kvm_vcpu *vcpu);
extern int kvm_mips_trans_mfc0(uint32_t inst, uint32_t *opc,
			       struct kvm_vcpu *vcpu);
extern int kvm_mips_trans_mtc0(uint32_t inst, uint32_t *opc,
			       struct kvm_vcpu *vcpu);

/* Misc */
extern void mips32_SyncICache(unsigned long addr, unsigned long size);
extern int kvm_mips_dump_stats(struct kvm_vcpu *vcpu);
extern unsigned long kvm_mips_get_ramsize(struct kvm *kvm);


#endif /* __MIPS_KVM_HOST_H__ */