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GodMode9/source/nand/virtual.c

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#include "virtual.h"
#include "platform.h"
#define VRT_ANYNAND (VRT_SYSNAND | VRT_EMUNAND | VRT_IMGNAND)
#define VFLAG_ON_O3DS NAND_TYPE_O3DS
#define VFLAG_ON_N3DS NAND_TYPE_N3DS
#define VFLAG_ON_NO3DS NAND_TYPE_NO3DS
#define VFLAG_ON_NAND (VFLAG_ON_O3DS | VFLAG_ON_N3DS | VFLAG_ON_NO3DS)
#define VFLAG_ON_MEMORY VRT_MEMORY
#define VFLAG_N3DS_ONLY (1<<30)
#define VFLAG_NAND_SIZE (1<<31)
// see: http://3dbrew.org/wiki/Flash_Filesystem#NAND_structure
// see: http://3dbrew.org/wiki/Memory_layout#ARM9
VirtualFile virtualFileTemplates[] = {
{ "twln.bin" , 0x00012E00, 0x08FB5200, 0x03, VFLAG_ON_NAND },
{ "twlp.bin" , 0x09011A00, 0x020B6600, 0x03, VFLAG_ON_NAND },
{ "agbsave.bin" , 0x0B100000, 0x00030000, 0x07, VFLAG_ON_NAND },
{ "firm0.bin" , 0x0B130000, 0x00400000, 0x06, VFLAG_ON_NAND | VFLAG_A9LH_AREA},
{ "firm1.bin" , 0x0B530000, 0x00400000, 0x06, VFLAG_ON_NAND | VFLAG_A9LH_AREA},
{ "ctrnand_fat.bin" , 0x0B95CA00, 0x2F3E3600, 0x04, VFLAG_ON_O3DS },
{ "ctrnand_fat.bin" , 0x0B95AE00, 0x41D2D200, 0x05, VFLAG_ON_N3DS },
{ "ctrnand_fat.bin" , 0x0B95AE00, 0x41D2D200, 0x04, VFLAG_ON_NO3DS },
{ "ctrnand_full.bin" , 0x0B930000, 0x2F5D0000, 0x04, VFLAG_ON_O3DS },
{ "ctrnand_full.bin" , 0x0B930000, 0x41ED0000, 0x05, VFLAG_ON_N3DS },
{ "ctrnand_full.bin" , 0x0B930000, 0x41ED0000, 0x04, VFLAG_ON_NO3DS },
{ "nand.bin" , 0x00000000, 0x00000000, 0xFF, VFLAG_ON_NAND | VFLAG_NAND_SIZE | VFLAG_A9LH_AREA },
{ "nand_minsize.bin" , 0x00000000, 0x3AF00000, 0xFF, VFLAG_ON_O3DS | VFLAG_A9LH_AREA },
{ "nand_minsize.bin" , 0x00000000, 0x4D800000, 0xFF, VFLAG_ON_N3DS | VFLAG_ON_NO3DS | VFLAG_A9LH_AREA },
{ "sector0x96.bin" , 0x00012C00, 0x00000200, 0xFF, VFLAG_ON_NAND | VFLAG_A9LH_AREA },
{ "nand_hdr.bin" , 0x00000000, 0x00000200, 0xFF, VFLAG_ON_NAND | VFLAG_A9LH_AREA },
{ "itcm.mem" , 0x01FF8000, 0x00008000, 0xFF, VFLAG_ON_MEMORY },
{ "arm9.mem" , 0x08000000, 0x00100000, 0xFF, VFLAG_ON_MEMORY },
{ "arm9ext.mem" , 0x08010000, 0x00100000, 0xFF, VFLAG_ON_MEMORY | VFLAG_N3DS_ONLY },
{ "vram.mem" , 0x18000000, 0x00600000, 0xFF, VFLAG_ON_MEMORY },
{ "dsp.mem" , 0x1FF00000, 0x00080000, 0xFF, VFLAG_ON_MEMORY },
{ "axiwram.mem" , 0x1FF80000, 0x00080000, 0xFF, VFLAG_ON_MEMORY },
{ "fcram.mem" , 0x20000000, 0x08000000, 0xFF, VFLAG_ON_MEMORY },
{ "fcramext.mem" , 0x28000000, 0x08000000, 0xFF, VFLAG_ON_MEMORY | VFLAG_N3DS_ONLY },
{ "dtcm.mem" , 0x30008000, 0x00004000, 0xFF, VFLAG_ON_MEMORY },
// { "bootrom.mem" , 0xFFFF0000, 0x00010000, 0xFF, VFLAG_ON_MEMORY },
{ "bootrom_unp.mem" , 0xFFFF0000, 0x00008000, 0xFF, VFLAG_ON_MEMORY }
};
u32 GetVirtualSource(const char* path) {
u32 plen = strnlen(path, 16);
if (strncmp(path, "S:/", (plen >= 3) ? 3 : 2) == 0)
return VRT_SYSNAND;
else if (strncmp(path, "E:/", (plen >= 3) ? 3 : 2) == 0)
return VRT_EMUNAND;
else if (strncmp(path, "I:/", (plen >= 3) ? 3 : 2) == 0)
return VRT_IMGNAND;
else if (strncmp(path, "M:/", (plen >= 3) ? 3 : 2) == 0)
return VRT_MEMORY;
return 0;
}
bool CheckVirtualDrive(const char* path) {
u32 virtual_src = GetVirtualSource(path);
if ((virtual_src == VRT_EMUNAND) || (virtual_src == VRT_IMGNAND)) {
return GetNandSizeSectors(virtual_src);
}
return virtual_src; // this is safe for SysNAND & memory
}
bool FindVirtualFile(VirtualFile* vfile, const char* path, u32 size)
{
char* fname = strchr(path, '/');
u32 virtual_src = 0;
u32 virtual_type = 0;
// fix the name
if (!fname) return false;
fname++;
// check path vailidity
virtual_src = GetVirtualSource(path);
if (!virtual_src || (fname - path != 3))
return false;
// check NAND type
virtual_type = (virtual_src & VRT_ANYNAND) ? CheckNandType(virtual_src) : virtual_src;
// parse the template list, get the correct one
u32 n_templates = sizeof(virtualFileTemplates) / sizeof(VirtualFile);
VirtualFile* curr_template = NULL;
for (u32 i = 0; i < n_templates; i++) {
curr_template = &virtualFileTemplates[i];
if ((curr_template->flags & virtual_type) && ((strncasecmp(fname, curr_template->name, 32) == 0) ||
(size && (curr_template->size == size)))) // search by size should be a last resort solution
break;
curr_template = NULL;
}
if (!curr_template) return false;
// copy current template to vfile
memcpy(vfile, curr_template, sizeof(VirtualFile));
// process special flags
if ((vfile->keyslot == 0x05) && !CheckSlot0x05Crypto())
return false; // keyslot 0x05 not properly set up
if (!(virtual_src & VRT_SYSNAND) || (*(vu32*) 0x101401C0))
vfile->flags &= ~VFLAG_A9LH_AREA; // flag is meaningless outside of A9LH / SysNAND
if ((vfile->flags & VFLAG_N3DS_ONLY) && (GetUnitPlatform() != PLATFORM_N3DS))
return false; // this is not on O3DS consoles
if (vfile->flags & VFLAG_NAND_SIZE) {
if ((virtual_src != NAND_SYSNAND) && (GetNandSizeSectors(NAND_SYSNAND) != GetNandSizeSectors(virtual_src)))
return false; // EmuNAND/IMGNAND is too small
vfile->size = GetNandSizeSectors(NAND_SYSNAND) * 0x200;
}
vfile->flags |= virtual_src;
return true;
}
int ReadVirtualFile(const VirtualFile* vfile, u8* buffer, u32 offset, u32 count, u32* bytes_read)
{
u32 foffset = vfile->offset + offset;
if (offset >= vfile->size)
return 0;
else if ((offset + count) > vfile->size)
count = vfile->size - offset;
if (bytes_read) *bytes_read = count;
if (vfile->flags & VFLAG_ON_NAND) {
if (!(foffset % 0x200) && !(count % 0x200)) { // aligned data -> simple case
// simple wrapper function for ReadNandSectors(u8* buffer, u32 sector, u32 count, u32 keyslot, u32 src)
return ReadNandSectors(buffer, foffset / 0x200, count / 0x200, vfile->keyslot,
vfile->flags & (VRT_SYSNAND | VRT_EMUNAND | VRT_IMGNAND));
} else { // nonaligned data -> -___-
u8 l_buffer[0x200];
u32 nand_src = vfile->flags & (VRT_SYSNAND | VRT_EMUNAND | VRT_IMGNAND);
u32 keyslot = vfile->keyslot;
int errorcode = 0;
if (foffset % 0x200) { // handle misaligned offset
u32 offset_fix = 0x200 - (foffset % 0x200);
errorcode = ReadNandSectors(l_buffer, foffset / 0x200, 1, keyslot, nand_src);
if (errorcode != 0) return errorcode;
memcpy(buffer, l_buffer + 0x200 - offset_fix, min(offset_fix, count));
if (count <= offset_fix) return 0;
foffset += offset_fix;
buffer += offset_fix;
count -= offset_fix;
} // foffset is now aligned and part of the data is read
if (count >= 0x200) { // otherwise this is misaligned and will be handled below
errorcode = ReadNandSectors(buffer, foffset / 0x200, count / 0x200, keyslot, nand_src);
if (errorcode != 0) return errorcode;
}
if (count % 0x200) { // handle misaligned count
u32 count_fix = count % 0x200;
errorcode = ReadNandSectors(l_buffer, (foffset + count) / 0x200, 1, keyslot, nand_src);
if (errorcode != 0) return errorcode;
memcpy(buffer + count - count_fix, l_buffer, count_fix);
}
return errorcode;
}
} else if (vfile->flags & VFLAG_ON_MEMORY) {
memcpy(buffer, (u8*) foffset, count);
return 0;
}
return -1;
}
int WriteVirtualFile(const VirtualFile* vfile, const u8* buffer, u32 offset, u32 count, u32* bytes_written)
{
u32 foffset = vfile->offset + offset;
if (offset >= vfile->size)
return 0;
else if ((offset + count) > vfile->size)
count = vfile->size - offset;
if (bytes_written) *bytes_written = count;
if (vfile->flags & VFLAG_ON_NAND) {
if (!(foffset % 0x200) && !(count % 0x200)) { // aligned data -> simple case
// simple wrapper function for WriteNandSectors(const u8* buffer, u32 sector, u32 count, u32 keyslot, u32 dest)
return WriteNandSectors(buffer, foffset / 0x200, count / 0x200, vfile->keyslot,
vfile->flags & (VRT_SYSNAND | VRT_EMUNAND | VRT_IMGNAND));
} else return -1; // misaligned data -> not implemented (!!!)
} else if (vfile->flags & VFLAG_ON_MEMORY) {
memcpy((u8*) foffset, buffer, count);
return 0;
}
return -1;
}
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