/*
 * QEMU CPU model
 *
 * Copyright (c) 2012 SUSE LINUX Products GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see
 * <http://www.gnu.org/licenses/gpl-2.0.html>
 */
#ifndef QEMU_CPU_H
#define QEMU_CPU_H

#include <signal.h>
#include <setjmp.h>
#include "hw/qdev-core.h"
#include "exec/hwaddr.h"
#include "qemu/queue.h"
#include "qemu/thread.h"
#include "qemu/tls.h"
#include "qemu/typedefs.h"

typedef int (*WriteCoreDumpFunction)(const void *buf, size_t size,
                                     void *opaque);

/**
 * vaddr:
 * Type wide enough to contain any #target_ulong virtual address.
 */
typedef uint64_t vaddr;
#define VADDR_PRId PRId64
#define VADDR_PRIu PRIu64
#define VADDR_PRIo PRIo64
#define VADDR_PRIx PRIx64
#define VADDR_PRIX PRIX64
#define VADDR_MAX UINT64_MAX

/* Since this macro is used a lot in hot code paths and in conjunction with
 * FooCPU *foo_env_get_cpu(), we deviate from usual QOM practice by using
 * an unchecked cast.
 */
#define CPU(obj) ((CPUState *)(obj))

typedef struct CPUState CPUState;

typedef void (*CPUUnassignedAccess)(CPUState *cpu, hwaddr addr,
                                    bool is_write, bool is_exec, int opaque,
                                    unsigned size);

struct TranslationBlock;

#ifdef HOST_WORDS_BIGENDIAN
typedef struct icount_decr_u16 {
    uint16_t high;
    uint16_t low;
} icount_decr_u16;
#else
typedef struct icount_decr_u16 {
    uint16_t low;
    uint16_t high;
} icount_decr_u16;
#endif

typedef struct CPUBreakpoint {
    vaddr pc;
    int flags; /* BP_* */
    QTAILQ_ENTRY(CPUBreakpoint) entry;
} CPUBreakpoint;

typedef struct CPUWatchpoint {
    vaddr vaddr;
    vaddr len_mask;
    int flags; /* BP_* */
    QTAILQ_ENTRY(CPUWatchpoint) entry;
} CPUWatchpoint;

struct KVMState;
struct kvm_run;

#define TB_JMP_CACHE_BITS 12
#define TB_JMP_CACHE_SIZE (1 << TB_JMP_CACHE_BITS)

// TODO(digit): Make this a proper QOM object that inherits from
// DeviceState/DeviceClass.
struct CPUState {
    int nr_cores;
    int nr_threads;
    int numa_node;

    struct QemuThread *thread;

    uint32_t host_tid; /* host thread ID */
    bool running;
    struct QemuCond *halt_cond;
    struct qemu_work_item *queued_work_first, *queued_work_last;

    bool created;
    bool stop;
    bool stopped;

    volatile sig_atomic_t exit_request;
    uint32_t interrupt_request;
    int singlestep_enabled;
    int64_t icount_extra;
    sigjmp_buf jmp_env;

    void *env_ptr; /* CPUArchState */
    struct TranslationBlock *current_tb;
    struct TranslationBlock *tb_jmp_cache[TB_JMP_CACHE_SIZE];
    struct GDBRegisterState *gdb_regs;
    QTAILQ_ENTRY(CPUState) node;

    const char *cpu_model_str;

    /* ice debug support */
    QTAILQ_HEAD(breakpoints_head, CPUBreakpoint) breakpoints;

    QTAILQ_HEAD(watchpoints_head, CPUWatchpoint) watchpoints;
    CPUWatchpoint *watchpoint_hit;

    void *opaque;

    /* In order to avoid passing too many arguments to the MMIO helpers,
     * we store some rarely used information in the CPU context.
     */
    uintptr_t mem_io_pc;
    vaddr mem_io_vaddr;

    int kvm_fd;
    bool kvm_vcpu_dirty;
    struct KVMState *kvm_state;
    struct kvm_run *kvm_run;

    struct hax_vcpu_state *hax_vcpu;

    /* TODO Move common fields from CPUArchState here. */
    int cpu_index; /* used by alpha TCG */
    uint32_t halted; /* used by alpha, cris, ppc TCG */
    union {
        uint32_t u32;
        icount_decr_u16 u16;
    } icount_decr;
    uint32_t can_do_io;
    int32_t exception_index; /* used by m68k TCG */

    /* Note that this is accessed at the start of every TB via a negative
       offset from AREG0.  Leave this field at the end so as to make the
       (absolute value) offset as small as possible.  This reduces code
       size, especially for hosts without large memory offsets.  */
    volatile sig_atomic_t tcg_exit_req;
};

QTAILQ_HEAD(CPUTailQ, CPUState);
extern struct CPUTailQ cpus;
#define CPU_NEXT(cpu) QTAILQ_NEXT(cpu, node)
#define CPU_FOREACH(cpu) QTAILQ_FOREACH(cpu, &cpus, node)
#define CPU_FOREACH_SAFE(cpu, next_cpu) \
    QTAILQ_FOREACH_SAFE(cpu, &cpus, node, next_cpu)
#define first_cpu QTAILQ_FIRST(&cpus)

DECLARE_TLS(CPUState *, current_cpu);
#define current_cpu tls_var(current_cpu)

// TODO(digit): Remove this.
#define cpu_single_env ((CPUArchState*)current_cpu->env_ptr)

/**
 * CPUDumpFlags:
 * @CPU_DUMP_CODE:
 * @CPU_DUMP_FPU: dump FPU register state, not just integer
 * @CPU_DUMP_CCOP: dump info about TCG QEMU's condition code optimization state
 */
enum CPUDumpFlags {
    CPU_DUMP_CODE = 0x00010000,
    CPU_DUMP_FPU  = 0x00020000,
    CPU_DUMP_CCOP = 0x00040000,
};

/**
 * cpu_dump_state:
 * @cpu: The CPU whose state is to be dumped.
 * @f: File to dump to.
 * @cpu_fprintf: Function to dump with.
 * @flags: Flags what to dump.
 *
 * Dumps CPU state.
 */
void cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
                    int flags);

/**
 * cpu_dump_statistics:
 * @cpu: The CPU whose state is to be dumped.
 * @f: File to dump to.
 * @cpu_fprintf: Function to dump with.
 * @flags: Flags what to dump.
 *
 * Dumps CPU statistics.
 */
void cpu_dump_statistics(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
                         int flags);

/**
 * cpu_reset:
 * @cpu: The CPU whose state is to be reset.
 */
void cpu_reset(CPUState *cpu);

/**
 * qemu_cpu_has_work:
 * @cpu: The vCPU to check.
 *
 * Checks whether the CPU has work to do.
 *
 * Returns: %true if the CPU has work, %false otherwise.
 */
bool qemu_cpu_has_work(CPUState *cpu);

/**
 * qemu_cpu_is_self:
 * @cpu: The vCPU to check against.
 *
 * Checks whether the caller is executing on the vCPU thread.
 *
 * Returns: %true if called from @cpu's thread, %false otherwise.
 */
bool qemu_cpu_is_self(CPUState *cpu);

/**
 * qemu_cpu_kick:
 * @cpu: The vCPU to kick.
 *
 * Kicks @cpu's thread.
 */
void qemu_cpu_kick(CPUState *cpu);

/**
 * cpu_is_stopped:
 * @cpu: The CPU to check.
 *
 * Checks whether the CPU is stopped.
 *
 * Returns: %true if run state is not running or if artificially stopped;
 * %false otherwise.
 */
bool cpu_is_stopped(CPUState *cpu);

/**
 * run_on_cpu:
 * @cpu: The vCPU to run on.
 * @func: The function to be executed.
 * @data: Data to pass to the function.
 *
 * Schedules the function @func for execution on the vCPU @cpu.
 */
void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data);

/**
 * qemu_get_cpu:
 * @index: The CPUState@cpu_index value of the CPU to obtain.
 *
 * Gets a CPU matching @index.
 *
 * Returns: The CPU or %NULL if there is no matching CPU.
 */
CPUState *qemu_get_cpu(int index);

/**
 * cpu_interrupt:
 * @cpu: The CPU to set an interrupt on.
 * @mask: The interupts to set.
 *
 * Invokes the interrupt handler.
 */
void cpu_interrupt(CPUState *cpu, int mask);

/**
 * cpu_reset_interrupt:
 * @cpu: The CPU to clear the interrupt on.
 * @mask: The interrupt mask to clear.
 *
 * Resets interrupts on the vCPU @cpu.
 */
void cpu_reset_interrupt(CPUState *cpu, int mask);

/**
 * cpu_exit:
 * @cpu: The CPU to exit.
 *
 * Requests the CPU @cpu to exit execution.
 */
void cpu_exit(CPUState *cpu);

/**
 * cpu_resume:
 * @cpu: The CPU to resume.
 *
 * Resumes CPU, i.e. puts CPU into runnable state.
 */
void cpu_resume(CPUState *cpu);

/**
 * qemu_init_vcpu:
 * @cpu: The vCPU to initialize.
 *
 * Initializes a vCPU.
 */
void qemu_init_vcpu(CPUState *cpu);


#define SSTEP_ENABLE  0x1  /* Enable simulated HW single stepping */
#define SSTEP_NOIRQ   0x2  /* Do not use IRQ while single stepping */
#define SSTEP_NOTIMER 0x4  /* Do not Timers while single stepping */

/**
 * cpu_single_step:
 * @cpu: CPU to the flags for.
 * @enabled: Flags to enable.
 *
 * Enables or disables single-stepping for @cpu.
 */
void cpu_single_step(CPUState *cpu, int enabled);

/* Breakpoint/watchpoint flags */
#define BP_MEM_READ           0x01
#define BP_MEM_WRITE          0x02
#define BP_MEM_ACCESS         (BP_MEM_READ | BP_MEM_WRITE)
#define BP_STOP_BEFORE_ACCESS 0x04
#define BP_WATCHPOINT_HIT     0x08
#define BP_GDB                0x10
#define BP_CPU                0x20

int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
                          CPUBreakpoint **breakpoint);
int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags);
void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *breakpoint);
void cpu_breakpoint_remove_all(CPUState *cpu, int mask);

int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len,
                          int flags, CPUWatchpoint **watchpoint);
int cpu_watchpoint_remove(CPUState *cpu, vaddr addr,
                          vaddr len, int flags);
void cpu_watchpoint_remove_by_ref(CPUState *cpu, CPUWatchpoint *watchpoint);
void cpu_watchpoint_remove_all(CPUState *cpu, int mask);
void QEMU_NORETURN cpu_abort(CPUState *cpu, const char *fmt, ...)
    GCC_FMT_ATTR(2, 3);
#ifdef CONFIG_SOFTMMU
extern const struct VMStateDescription vmstate_cpu_common;
#else
#define vmstate_cpu_common vmstate_dummy
#endif

#define VMSTATE_CPU() {                                                     \
    .name = "parent_obj",                                                   \
    .size = sizeof(CPUState),                                               \
    .vmsd = &vmstate_cpu_common,                                            \
    .flags = VMS_STRUCT,                                                    \
    .offset = 0,                                                            \
}

#endif