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Add some structs for files that DSi_NAND reads (#1842)
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* Add DSiFirmwareSystemSettings

* Replace DSiFirmwareSystemSettings::TouchCalibration fields with std::arrays

- So assignment can be done in one line

* Make DSiFirmwareSystemSettings a union

- So its bytes can be accessed

* Add a comment

* Use DSiFirmwareSystemSettings instead of raw byte offsets

* Add definitions for DSiSerialData and DSiHardwareInfoN

* Move DSiFirmwareSystemSettings's hash update logic into its own method
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@JesseTG
JesseTG authored Oct 2, 2023
1 parent bb09ce7 commit b2fcff9
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Showing 3 changed files with 145 additions and 36 deletions.
10 changes: 5 additions & 5 deletions src/DSi.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -530,20 +530,20 @@ void SetupDirectBoot()

if (DSi_NAND::Init(&DSi::ARM7iBIOS[0x8308]))
{
u8 userdata[0x1B0];
DSi_NAND::DSiFirmwareSystemSettings userdata {};
DSi_NAND::ReadUserData(userdata);
for (u32 i = 0; i < 0x128; i+=4)
ARM9Write32(0x02000400+i, *(u32*)&userdata[0x88+i]);
ARM9Write32(0x02000400+i, *(u32*)&userdata.Bytes[0x88+i]);

u8 hwinfoS[0xA4];
u8 hwinfoN[0x9C];
DSi_NAND::DSiSerialData hwinfoS {};
DSi_NAND::DSiHardwareInfoN hwinfoN;
DSi_NAND::ReadHardwareInfo(hwinfoS, hwinfoN);

for (u32 i = 0; i < 0x14; i+=4)
ARM9Write32(0x02000600+i, *(u32*)&hwinfoN[0x88+i]);

for (u32 i = 0; i < 0x18; i+=4)
ARM9Write32(0x02FFFD68+i, *(u32*)&hwinfoS[0x88+i]);
ARM9Write32(0x02FFFD68+i, *(u32*)&hwinfoS.Bytes[0x88+i]);

DSi_NAND::DeInit();
}
Expand Down
59 changes: 30 additions & 29 deletions src/DSi_NAND.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -486,7 +486,7 @@ bool ESDecrypt(u8* data, u32 len)
}


void ReadHardwareInfo(u8* dataS, u8* dataN)
void ReadHardwareInfo(DSiSerialData& dataS, DSiHardwareInfoN& dataN)
{
FF_FIL file;
FRESULT res;
Expand All @@ -495,20 +495,20 @@ void ReadHardwareInfo(u8* dataS, u8* dataN)
res = f_open(&file, "0:/sys/HWINFO_S.dat", FA_OPEN_EXISTING | FA_READ);
if (res == FR_OK)
{
f_read(&file, dataS, 0xA4, &nread);
f_read(&file, &dataS, sizeof(DSiSerialData), &nread);
f_close(&file);
}

res = f_open(&file, "0:/sys/HWINFO_N.dat", FA_OPEN_EXISTING | FA_READ);
if (res == FR_OK)
{
f_read(&file, dataN, 0x9C, &nread);
f_read(&file, dataN.data(), sizeof(dataN), &nread);
f_close(&file);
}
}


void ReadUserData(u8* data)
void ReadUserData(DSiFirmwareSystemSettings& data)
{
FF_FIL file;
FRESULT res;
Expand Down Expand Up @@ -553,7 +553,7 @@ void ReadUserData(u8* data)
}

f_lseek(&file, 0);
f_read(&file, data, 0x1B0, &nread);
f_read(&file, &data, sizeof(DSiFirmwareSystemSettings), &nread);
f_close(&file);
}

Expand All @@ -574,10 +574,10 @@ void PatchUserData()
continue;
}

u8 contents[0x1B0];
DSiFirmwareSystemSettings contents;
u32 nres;
f_lseek(&file, 0);
f_read(&file, contents, 0x1B0, &nres);
f_read(&file, &contents, sizeof(DSiFirmwareSystemSettings), &nres);

// override user settings, if needed
if (Platform::GetConfigBool(Platform::Firm_OverrideSettings))
Expand All @@ -586,46 +586,39 @@ void PatchUserData()
std::string orig_username = Platform::GetConfigString(Platform::Firm_Username);
std::u16string username = std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>{}.from_bytes(orig_username);
size_t usernameLength = std::min(username.length(), (size_t) 10);
memset(contents + 0xD0, 0, 11 * sizeof(char16_t));
memcpy(contents + 0xD0, username.data(), usernameLength * sizeof(char16_t));
memset(&contents.Nickname, 0, sizeof(contents.Nickname));
memcpy(&contents.Nickname, username.data(), usernameLength * sizeof(char16_t));

// setting language
contents[0x8E] = Platform::GetConfigInt(Platform::Firm_Language);
contents.Language = static_cast<SPI_Firmware::Language>(Platform::GetConfigInt(Platform::Firm_Language));

// setting up color
contents[0xCC] = Platform::GetConfigInt(Platform::Firm_Color);
contents.FavoriteColor = Platform::GetConfigInt(Platform::Firm_Color);

// setting up birthday
contents[0xCE] = Platform::GetConfigInt(Platform::Firm_BirthdayMonth);
contents[0xCF] = Platform::GetConfigInt(Platform::Firm_BirthdayDay);
contents.BirthdayMonth = Platform::GetConfigInt(Platform::Firm_BirthdayMonth);
contents.BirthdayDay = Platform::GetConfigInt(Platform::Firm_BirthdayDay);

// setup message
std::string orig_message = Platform::GetConfigString(Platform::Firm_Message);
std::u16string message = std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>{}.from_bytes(orig_message);
size_t messageLength = std::min(message.length(), (size_t) 26);
memset(contents + 0xE6, 0, 27 * sizeof(char16_t));
memcpy(contents + 0xE6, message.data(), messageLength * sizeof(char16_t));
memset(&contents.Message, 0, sizeof(contents.Message));
memcpy(&contents.Message, message.data(), messageLength * sizeof(char16_t));

// TODO: make other items configurable?
}

// fix touchscreen coords
*(u16*)&contents[0xB8] = 0;
*(u16*)&contents[0xBA] = 0;
contents[0xBC] = 0;
contents[0xBD] = 0;
*(u16*)&contents[0xBE] = 255<<4;
*(u16*)&contents[0xC0] = 191<<4;
contents[0xC2] = 255;
contents[0xC3] = 191;

SHA1_CTX sha;
SHA1Init(&sha);
SHA1Update(&sha, &contents[0x88], 0x128);
SHA1Final(&contents[0], &sha);
contents.TouchCalibrationADC1 = {0, 0};
contents.TouchCalibrationPixel1 = {0, 0};
contents.TouchCalibrationADC2 = {255 << 4, 191 << 4};
contents.TouchCalibrationPixel2 = {255, 191};

contents.UpdateHash();

f_lseek(&file, 0);
f_write(&file, contents, 0x1B0, &nres);
f_write(&file, &contents, sizeof(DSiFirmwareSystemSettings), &nres);

f_close(&file);
}
Expand Down Expand Up @@ -1318,4 +1311,12 @@ bool ExportTitleData(u32 category, u32 titleid, int type, const char* file)
return ExportFile(fname, file);
}

void DSiFirmwareSystemSettings::UpdateHash()
{
SHA1_CTX sha;
SHA1Init(&sha);
SHA1Update(&sha, &Bytes[0x88], 0x128);
SHA1Final(Hash.data(), &sha);
}

}
112 changes: 110 additions & 2 deletions src/DSi_NAND.h
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@
#include "types.h"
#include "NDS_Header.h"
#include "DSi_TMD.h"
#include "SPI_Firmware.h"
#include <array>
#include <vector>
#include <string>

Expand All @@ -35,16 +37,20 @@ enum
TitleData_BannerSav,
};

union DSiFirmwareSystemSettings;
union DSiSerialData;
using DSiHardwareInfoN = std::array<u8, 0x9C>;

bool Init(u8* es_keyY);
void DeInit();

Platform::FileHandle* GetFile();

void GetIDs(u8* emmc_cid, u64& consoleid);

void ReadHardwareInfo(u8* dataS, u8* dataN);
void ReadHardwareInfo(DSiSerialData& dataS, DSiHardwareInfoN& dataN);

void ReadUserData(u8* data);
void ReadUserData(DSiFirmwareSystemSettings& data);
void PatchUserData();

void ListTitles(u32 category, std::vector<u32>& titlelist);
Expand All @@ -58,6 +64,108 @@ u32 GetTitleDataMask(u32 category, u32 titleid);
bool ImportTitleData(u32 category, u32 titleid, int type, const char* file);
bool ExportTitleData(u32 category, u32 titleid, int type, const char* file);

typedef std::array<u8, 20> SHA1Hash;
typedef std::array<u8, 8> TitleID;

/// Firmware settings for the DSi, saved to the NAND as TWLCFG0.dat or TWLCFG1.dat.
/// The DSi mirrors this information to its own firmware for compatibility with NDS games.
/// @note The file is normally 16KiB, but only the first 432 bytes are used;
/// the rest is FF-padded.
/// This struct excludes the padding.
/// @see https://problemkaputt.de/gbatek.htm#dsisdmmcfirmwaresystemsettingsdatafiles
union DSiFirmwareSystemSettings
{
struct
{
SHA1Hash Hash;
u8 Zero00[108];
u8 Version;
u8 UpdateCounter;
u8 Zero01[2];
u32 BelowRAMAreaSize;
u32 ConfigFlags;
u8 Zero02;
u8 CountryCode;
SPI_Firmware::Language Language;
u8 RTCYear;
u32 RTCOffset;
u8 Zero3[4];
u8 EULAVersion;
u8 Zero04[9];
u8 AlarmHour;
u8 AlarmMinute;
u8 Zero05[2];
bool AlarmEnable;
u8 Zero06[2];
u8 SystemMenuUsedTitleSlots;
u8 SystemMenuFreeTitleSlots;
u8 Unknown0;
u8 Unknown1;
u8 Zero07[3];
TitleID SystemMenuMostRecentTitleID;
std::array<u16, 2> TouchCalibrationADC1;
std::array<u8, 2> TouchCalibrationPixel1;
std::array<u16, 2> TouchCalibrationADC2;
std::array<u8, 2> TouchCalibrationPixel2;
u8 Unknown2[4];
u8 Zero08[4];
u8 FavoriteColor;
u8 Zero09;
u8 BirthdayMonth;
u8 BirthdayDay;
char16_t Nickname[11];
char16_t Message[27];
u8 ParentalControlsFlags;
u8 Zero10[6];
u8 ParentalControlsRegion;
u8 ParentalControlsYearsOfAgeRating;
u8 ParentalControlsSecretQuestion;
u8 Unknown3;
u8 Zero11[2];
char ParentalControlsPIN[5];
char16_t ParentalControlsSecretAnswer[65];
};
u8 Bytes[432];

void UpdateHash();
};

static_assert(sizeof(DSiFirmwareSystemSettings) == 432, "DSiFirmwareSystemSettings must be exactly 432 bytes");

enum class ConsoleRegion : u8
{
Japan,
USA,
Europe,
Australia,
China,
Korea,
};

/// Data file saved to 0:/sys/HWINFO_S.dat.
/// @note The file is normally 16KiB, but only the first 164 bytes are used;
/// the rest is FF-padded.
/// This struct excludes the padding.
/// @see https://problemkaputt.de/gbatek.htm#dsisdmmcfirmwaremiscfiles
union DSiSerialData
{
struct
{
u8 RsaSha1HMAC[0x80];
u32 Version;
u32 EntrySize;
u32 SupportedLanguages;
u8 Unknown0[4];
ConsoleRegion Region;
char Serial[12];
u8 Unknown1[3];
u8 TitleIDLSBs[4];
};
u8 Bytes[164];
};

static_assert(sizeof(DSiSerialData) == 164, "DSiSerialData must be exactly 164 bytes");

}

#endif // DSI_NAND_H

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