Return to zram.cpp CVS log

Up to [Isaki's NoNo m68k/m88k emulator] / nono / vm

Annotation of nono/vm/zram.cpp, revision 1.1.1.5

1.1       root        1: //
                      2: // nono
1.1.1.3   root        3: // Copyright (C) 2020 nono project
                      4: // Licensed under nono-license.txt
1.1       root        5: //
                      6: 
                      7: //
                      8: // 3ポート共有 RAM
                      9: //
                     10: 
1.1.1.5 ! root       11: // ZRAM はバイト配置とする。
        !            12: 
        !            13: #include "zram.h"
        !            14: 
        !            15: // グローバル参照用
        !            16: ZRAMDevice *gZRAM;
1.1       root       17: 
1.1.1.5 ! root       18: // コンストラクタ
1.1       root       19: ZRAMDevice::ZRAMDevice()
1.1.1.4   root       20:        : inherited("ZRAM")
1.1       root       21: {
                     22:        devaddr = 0x71000000;
                     23:        devlen = 128 * 1024;
                     24: 
1.1.1.2   root       25:        ram.reset(new uint8[devlen]);
1.1       root       26: }
                     27: 
1.1.1.5 ! root       28: // デストラクタ
1.1       root       29: ZRAMDevice::~ZRAMDevice()
                     30: {
1.1.1.5 ! root       31:        gZRAM = NULL;
1.1       root       32: }
                     33: 
1.1.1.2   root       34: // アドレスデコーダ
                     35: inline uint64
                     36: ZRAMDevice::Decoder(uint32 addr) const
                     37: {
                     38:        // たぶん 128KB で折り返しイメージが見えるはず。要確認。
                     39:        return addr % devlen;
                     40: }
1.1       root       41: 
                     42: uint64
                     43: ZRAMDevice::Read8(uint32 addr)
                     44: {
1.1.1.2   root       45:        uint32 offset = Decoder(addr);
1.1.1.5 ! root       46:        uint32 data = ram[offset];
1.1       root       47:        return data;
                     48: }
                     49: 
                     50: uint64
                     51: ZRAMDevice::Read16(uint32 addr)
                     52: {
1.1.1.2   root       53:        uint32 offset = Decoder(addr);
1.1.1.5 ! root       54:        uint32 data;
        !            55:        data  = (uint32)ram[offset + 0] << 8;
        !            56:        data |= (uint32)ram[offset + 1];
1.1       root       57:        return data;
                     58: }
                     59: 
                     60: uint64
                     61: ZRAMDevice::Read32(uint32 addr)
                     62: {
1.1.1.2   root       63:        uint32 offset = Decoder(addr);
1.1.1.5 ! root       64:        uint32 data;
        !            65:        data  = (uint32)ram[offset + 0] << 24;
        !            66:        data |= (uint32)ram[offset + 1] << 16;
        !            67:        data |= (uint32)ram[offset + 2] << 8;
        !            68:        data |= (uint32)ram[offset + 3];
1.1       root       69:        return data;
                     70: }
                     71: 
                     72: uint64
                     73: ZRAMDevice::Write8(uint32 addr, uint32 data)
                     74: {
1.1.1.5 ! root       75:        putlog(3, "$%08x.B <- $%02x", addr, data);
1.1       root       76: 
1.1.1.2   root       77:        uint32 offset = Decoder(addr);
1.1.1.5 ! root       78:        ram[offset] = data;
1.1       root       79:        return 0;
                     80: }
                     81: 
                     82: uint64
                     83: ZRAMDevice::Write16(uint32 addr, uint32 data)
                     84: {
1.1.1.5 ! root       85:        putlog(3, "$%08x.W <- $%04x", addr, data);
1.1       root       86: 
1.1.1.2   root       87:        uint32 offset = Decoder(addr);
1.1.1.5 ! root       88:        ram[offset + 0] = (data >> 8) & 0xff;
        !            89:        ram[offset + 1] =  data       & 0xff;
1.1       root       90:        return 0;
                     91: }
                     92: 
                     93: uint64
                     94: ZRAMDevice::Write32(uint32 addr, uint32 data)
                     95: {
1.1.1.5 ! root       96:        putlog(3, "$%08x.L <- $%08x", addr, data);
1.1       root       97: 
1.1.1.2   root       98:        uint32 offset = Decoder(addr);
1.1.1.5 ! root       99:        ram[offset + 0] =  data >> 24;
        !           100:        ram[offset + 1] = (data >> 16) & 0xff;
        !           101:        ram[offset + 2] = (data >> 8)  & 0xff;
        !           102:        ram[offset + 3] =  data        & 0xff;
1.1       root      103:        return 0;
                    104: }
                    105: 
                    106: uint64
                    107: ZRAMDevice::Peek8(uint32 addr)
                    108: {
1.1.1.2   root      109:        uint32 offset = Decoder(addr);
1.1.1.5 ! root      110:        return ram[offset];
1.1       root      111: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.