piemu/sram.c at modernize · autch/piemu · GitHub

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/*
 *	sram.c
 *
 *	P/EMU - P/ECE Emulator
 *	Copyright (C) 2003 Naoyuki Sawa
 *
 *	* Mon Apr 14 00:00:00 JST 2003 Naoyuki Sawa
 *	- 作成開始。
 */
#include "app.h"

/****************************************************************************
 *	グローバル変数
 ****************************************************************************/

//SRAM sram;

/****************************************************************************
 *	グローバル関数
 ****************************************************************************/

void sram_init(PIEMU_CONTEXT* context)
{
    /* メモリ割り当て。 */
    memset(&context->sram, 0, sizeof context->sram);
    context->sram.mem_size = context->emu.sysinfo.sram_end - context->emu.sysinfo.sram_top;
    context->sram.mem = (unsigned char*)calloc(context->sram.mem_size, 1);
}

int sram_read(PIEMU_CONTEXT* context, unsigned ofs, int size)
{
    ofs &= context->sram.mem_size - 1;
    switch (size) {
    case 1:
        return READ_MEM_B(context->sram.mem + ofs);
    case 2:
        return READ_MEM_H(context->sram.mem + ofs);
    case 4:
        return READ_MEM_W(context->sram.mem + ofs);
    }
    DIE();
    return -1; /* 警告抑制 */
}

void sram_write(PIEMU_CONTEXT* context, unsigned ofs, int data, int size)
{
    ofs &= context->sram.mem_size - 1;
    switch (size) {
    case 1:
        *(char*)&context->sram.mem[ofs] = data;
        return;
    case 2:
        *(short*)&context->sram.mem[ofs] = data;
        return;
    case 4:
        *(int*)&context->sram.mem[ofs] = data;
        return;
    }
    DIE();
}

IOHANDLER_R(sram, B)
{
    ofs &= context->sram.mem_size - 1;
    return READ_MEM_B(context->sram.mem + ofs);
}
IOHANDLER_W(sram, B)
{
    ofs &= context->sram.mem_size - 1;
    *(char*)&context->sram.mem[ofs] = data;
}
IOHANDLER_R(sram, H)
{
    ofs &= context->sram.mem_size - 1;
    return READ_MEM_H(context->sram.mem + ofs);
}
IOHANDLER_W(sram, H)
{
    ofs &= context->sram.mem_size - 1;
    *(short*)&context->sram.mem[ofs] = data;
}
IOHANDLER_R(sram, W)
{
    ofs &= context->sram.mem_size - 1;
    return READ_MEM_W(context->sram.mem + ofs);
}
IOHANDLER_W(sram, W)
{
    ofs &= context->sram.mem_size - 1;
    *(int*)&context->sram.mem[ofs] = data;
}