#ifndef PROC_H
#define PROC_H

#include <config.h>
#include <riscv.h>
#include <stdint.h>

typedef enum {
    UNUSED,
    USED,
    SLEEPING,
    RUNNABLE,
    RUNNING,
    ZOMBIE,
} ProcessState;

/** Saved registers for kernel context switches. */
typedef struct Context {
    uint64_t ra;
    uint64_t sp;

    // callee-saved
    uint64_t s0;
    uint64_t s1;
    uint64_t s2;
    uint64_t s3;
    uint64_t s4;
    uint64_t s5;
    uint64_t s6;
    uint64_t s7;
    uint64_t s8;
    uint64_t s9;
    uint64_t s10;
    uint64_t s11;
} Context;

/** Per-CPU state. */
typedef struct cpu_t {
    struct Process *proc;    // The process running on this cpu, or null.
    struct Context  context; // swtch() here to enter scheduler().
    int             noff;    // Depth of push_off() nesting.
    int             intena;  // Were interrupts enabled before push_off()?
} Cpu;

/** Saved registers for kernel context switches. */
typedef struct TrapFrame_t {
    /*   0 */ uint64_t kernel_satp;   // kernel page table
    /*   8 */ uint64_t kernel_sp;     // top of process's kernel stack
    /*  16 */ uint64_t kernel_trap;   // usertrap()
    /*  24 */ uint64_t epc;           // saved user program counter
    /*  32 */ uint64_t kernel_hartid; // saved kernel tp
    /*  40 */ uint64_t ra;
    /*  48 */ uint64_t sp;
    /*  56 */ uint64_t gp;
    /*  64 */ uint64_t tp;
    /*  72 */ uint64_t t0;
    /*  80 */ uint64_t t1;
    /*  88 */ uint64_t t2;
    /*  96 */ uint64_t s0;
    /* 104 */ uint64_t s1;
    /* 112 */ uint64_t a0;
    /* 120 */ uint64_t a1;
    /* 128 */ uint64_t a2;
    /* 136 */ uint64_t a3;
    /* 144 */ uint64_t a4;
    /* 152 */ uint64_t a5;
    /* 160 */ uint64_t a6;
    /* 168 */ uint64_t a7;
    /* 176 */ uint64_t s2;
    /* 184 */ uint64_t s3;
    /* 192 */ uint64_t s4;
    /* 200 */ uint64_t s5;
    /* 208 */ uint64_t s6;
    /* 216 */ uint64_t s7;
    /* 224 */ uint64_t s8;
    /* 232 */ uint64_t s9;
    /* 240 */ uint64_t s10;
    /* 248 */ uint64_t s11;
    /* 256 */ uint64_t t3;
    /* 264 */ uint64_t t4;
    /* 272 */ uint64_t t5;
    /* 280 */ uint64_t t6;
} TrapFrame;

Cpu *mycpu(void);

extern Cpu cpus[NCPU];

/** Per-process state */
struct Proc {};

#endif // PROC_H