diff options
Diffstat (limited to 'src/NDSCart.cpp')
| -rw-r--r-- | src/NDSCart.cpp | 165 |
1 files changed, 92 insertions, 73 deletions
diff --git a/src/NDSCart.cpp b/src/NDSCart.cpp index 4d10203..9808fef 100644 --- a/src/NDSCart.cpp +++ b/src/NDSCart.cpp @@ -235,93 +235,97 @@ void CartCommon::FlushSRAMFile() int CartCommon::ROMCommandStart(u8* cmd, u8* data, u32 len) { - switch (cmd[0]) + if (CmdEncMode == 0) { - case 0x9F: - memset(data, 0xFF, len); - return 0; - - case 0x00: - memset(data, 0, len); - if (len > 0x1000) + switch (cmd[0]) { - ReadROM(0, 0x1000, data, 0); - for (u32 pos = 0x1000; pos < len; pos += 0x1000) - memcpy(data+pos, data, 0x1000); - } - else - ReadROM(0, len, data, 0); - return 0; + case 0x9F: + memset(data, 0xFF, len); + return 0; - case 0x90: - case 0xB8: - for (u32 pos = 0; pos < len; pos += 4) - *(u32*)&data[pos] = ChipID; - return 0; + case 0x00: + memset(data, 0, len); + if (len > 0x1000) + { + ReadROM(0, 0x1000, data, 0); + for (u32 pos = 0x1000; pos < len; pos += 0x1000) + memcpy(data+pos, data, 0x1000); + } + else + ReadROM(0, len, data, 0); + return 0; - case 0x3C: - CmdEncMode = 1; - Key1_InitKeycode(false, *(u32*)&ROM[0xC], 2, 2); - return 0; + case 0x90: + for (u32 pos = 0; pos < len; pos += 4) + *(u32*)&data[pos] = ChipID; + return 0; - case 0x3D: - if (IsDSi) - { - CmdEncMode = 11; - Key1_InitKeycode(true, *(u32*)&ROM[0xC], 1, 2); - } - return 0; + case 0x3C: + CmdEncMode = 1; + Key1_InitKeycode(false, *(u32*)&ROM[0xC], 2, 2); + return 0; - default: - if (CmdEncMode == 1 || CmdEncMode == 11) - { - // decrypt the KEY1 command as needed - // (KEY2 commands do not need decrypted because KEY2 is handled entirely by hardware, - // but KEY1 is not, so DS software is responsible for encrypting KEY1 commands) - u8 cmddec[8]; - *(u32*)&cmddec[0] = ByteSwap(*(u32*)&cmd[4]); - *(u32*)&cmddec[4] = ByteSwap(*(u32*)&cmd[0]); - Key1_Decrypt((u32*)cmddec); - u32 tmp = ByteSwap(*(u32*)&cmddec[4]); - *(u32*)&cmddec[4] = ByteSwap(*(u32*)&cmddec[0]); - *(u32*)&cmddec[0] = tmp; - - // TODO eventually: verify all the command parameters and shit - - switch (cmddec[0] & 0xF0) + case 0x3D: + if (IsDSi) { - case 0x40: - DataEncMode = 2; - return 0; + CmdEncMode = 11; + Key1_InitKeycode(true, *(u32*)&ROM[0xC], 1, 2); + } + return 0; - case 0x10: - for (u32 pos = 0; pos < len; pos += 4) - *(u32*)&data[pos] = ChipID; - return 0; + default: + return 0; + } + } + else if (CmdEncMode == 1 || CmdEncMode == 11) + { + // decrypt the KEY1 command as needed + // (KEY2 commands do not need decrypted because KEY2 is handled entirely by hardware, + // but KEY1 is not, so DS software is responsible for encrypting KEY1 commands) + u8 cmddec[8]; + *(u32*)&cmddec[0] = ByteSwap(*(u32*)&cmd[4]); + *(u32*)&cmddec[4] = ByteSwap(*(u32*)&cmd[0]); + Key1_Decrypt((u32*)cmddec); + u32 tmp = ByteSwap(*(u32*)&cmddec[4]); + *(u32*)&cmddec[4] = ByteSwap(*(u32*)&cmddec[0]); + *(u32*)&cmddec[0] = tmp; + + // TODO eventually: verify all the command parameters and shit + + switch (cmddec[0] & 0xF0) + { + case 0x40: + DataEncMode = 2; + return 0; - case 0x20: + case 0x10: + for (u32 pos = 0; pos < len; pos += 4) + *(u32*)&data[pos] = ChipID; + return 0; + + case 0x20: + { + u32 addr = (cmddec[2] & 0xF0) << 8; + if (CmdEncMode == 11) { - u32 addr = (cmddec[2] & 0xF0) << 8; - if (CmdEncMode == 11) - { - // the DSi region starts with 0x3000 unreadable bytes - // similarly to how the DS region starts at 0x1000 with 0x3000 unreadable bytes - // these contain data for KEY1 crypto - u32 dsiregion = *(u16*)&ROM[0x92] << 19; - addr -= 0x1000; - addr += dsiregion; - } - ReadROM(addr, 0x1000, data, 0); + // the DSi region starts with 0x3000 unreadable bytes + // similarly to how the DS region starts at 0x1000 with 0x3000 unreadable bytes + // these contain data for KEY1 crypto + u32 dsiregion = *(u16*)&ROM[0x92] << 19; + addr -= 0x1000; + addr += dsiregion; } - return 0; - - case 0xA0: - CmdEncMode = 2; - return 0; + ReadROM(addr, 0x1000, data, 0); } + return 0; + + case 0xA0: + CmdEncMode = 2; + return 0; } - return 0; } + + return 0; } void CartCommon::ROMCommandFinish(u8* cmd, u8* data, u32 len) @@ -509,6 +513,8 @@ void CartRetail::FlushSRAMFile() int CartRetail::ROMCommandStart(u8* cmd, u8* data, u32 len) { + if (CmdEncMode != 2) return CartCommon::ROMCommandStart(cmd, data, len); + switch (cmd[0]) { case 0xB7: @@ -527,6 +533,11 @@ int CartRetail::ROMCommandStart(u8* cmd, u8* data, u32 len) } return 0; + case 0xB8: + for (u32 pos = 0; pos < len; pos += 4) + *(u32*)&data[pos] = ChipID; + return 0; + default: return CartCommon::ROMCommandStart(cmd, data, len); } @@ -871,6 +882,8 @@ int CartRetailNAND::ImportSRAM(const u8* data, u32 length) int CartRetailNAND::ROMCommandStart(u8* cmd, u8* data, u32 len) { + if (CmdEncMode != 2) return CartCommon::ROMCommandStart(cmd, data, len); + switch (cmd[0]) { case 0x81: // write data @@ -1005,6 +1018,8 @@ int CartRetailNAND::ROMCommandStart(u8* cmd, u8* data, u32 len) void CartRetailNAND::ROMCommandFinish(u8* cmd, u8* data, u32 len) { + if (CmdEncMode != 2) return CartCommon::ROMCommandFinish(cmd, data, len); + switch (cmd[0]) { case 0x81: // write data @@ -1163,6 +1178,8 @@ void CartHomebrew::DoSavestate(Savestate* file) int CartHomebrew::ROMCommandStart(u8* cmd, u8* data, u32 len) { + if (CmdEncMode != 2) return CartCommon::ROMCommandStart(cmd, data, len); + switch (cmd[0]) { case 0xB7: @@ -1204,6 +1221,8 @@ int CartHomebrew::ROMCommandStart(u8* cmd, u8* data, u32 len) void CartHomebrew::ROMCommandFinish(u8* cmd, u8* data, u32 len) { + if (CmdEncMode != 2) return CartCommon::ROMCommandFinish(cmd, data, len); + // TODO: delayed SD writing? like we have for SRAM switch (cmd[0]) |