kvisc/vm/pc/arch.h

// The OS/K Team licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#ifndef _ARCH_H
#define _ARCH_H

#define dev_t stddev_t

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <stdarg.h>
#include <limits.h>

#undef dev_t
#define packed __attribute__ ((__packed__))
#define static_assert _Static_assert
#define alignof _Alignof

typedef unsigned int        bool;
typedef unsigned char       uchar;
typedef unsigned short      ushort;
typedef unsigned int        uint;
typedef unsigned long       ulong;

typedef struct reg_t        reg_t;
typedef struct ctx_t        ctx_t;
typedef struct instr_t      instr_t;
typedef struct acc_t        acc_t;
typedef struct arch_t       arch_t;
typedef struct dev_t        dev_t;

void log(const char *, ...);
void vlog(const char *, va_list);

struct ctx_t
{
    reg_t   *r;
    instr_t *i;

    // Memory and memory size
    ushort *mp;
    ulong   mz;

    // Read next instruction
    ushort (*get)(ctx_t *ctx);

    // Step by step
    int step;

    // Devices list head
    dev_t *dh;
};

#define R(X) ctx->r[X].val

static inline ushort bswap16(ushort u)
{ return ((u<<8) | (u>>8)); }

static inline char getmempref(ushort len)
{ return (len==1?'b':(len==2?'w':(len==4?'l':(len==8?'q':'x')))); }

enum
{
    E_SHT,          // Shutdown instruction
    E_IMP,          // Not implemented
    E_ILL,          // Ill-formed
    E_ACC,          // Invalid access
    E_SYS,          // Supervisor only
    E_ALI,          // Alignment error
    E_STA,          // Stack misalignment
    E_STU,          // Stack underflow
    NEXCPTS
};

void dumpregs(ctx_t *);
void dumpinstr(ctx_t *, ulong, uint, ushort, acc_t *, acc_t *);
void dumpmem(ctx_t *, ulong, ulong);

void _except(ctx_t *, int, char *, ...) __attribute__((__noreturn__));

void decode(ctx_t *ctx);

#define MEMOFF (1 * 1024 * 1024)
#define MEMSIZE (16 * 1024 * 1024)  // 16MB

#define addr2real(p) (((p) - MEMOFF) / 2)
#define real2addr(p) (((p) + MEMOFF) / 2)

// Address of boot firmware stack
#define FWSTACK (MEMOFF * 2)        // 2MB

ulong readmem8(ctx_t *, ulong addr);
ulong readmem16(ctx_t *, ulong addr);
ulong readmem32(ctx_t *, ulong addr);
ulong readmem64(ctx_t *, ulong addr);
ulong readmem(ctx_t *c, ulong addr, uint len);

void writemem8(ctx_t *, ulong val, ulong addr);
void writemem16(ctx_t *, ulong val, ulong addr);
void writemem32(ctx_t *, ulong val, ulong addr);
void writemem64(ctx_t *, ulong val, ulong addr);
void writemem(ctx_t *, ulong val, ulong addr, uint len);

#include <pc/regs.h>
#include <pc/decd.h>
#include <in/arch_i.h>

extern reg_t arch_r[NREGS];
extern instr_t arch_i[NINSTRS];

#endif