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exo: read first two sd card sectors in mariko_fatal

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This commit is contained in:
Michael Scire
2020-11-15 13:31:01 -08:00
committed by SciresM
parent 7bcd5c6e3b
commit 898fe61034
6 changed files with 67 additions and 13 deletions
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42
exosphere/mariko_fatal/source/fatal_sdmmc.cpp
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@@ -26,23 +26,55 @@ namespace ams::secmon::fatal {
return MemoryRegionVirtualDramSdmmcMappedData.GetPointer<u8>() + MemoryRegionVirtualDramSdmmcMappedData.GetSize() - mmu::PageSize;
}
ALWAYS_INLINE u8 *GetSdCardDmaBuffer() {
return MemoryRegionVirtualDramSdmmcMappedData.GetPointer<u8>();
}
constexpr inline size_t SdCardDmaBufferSize = MemoryRegionVirtualDramSdmmcMappedData.GetSize() - mmu::PageSize;
constexpr inline size_t SdCardDmaBufferSectors = SdCardDmaBufferSize / sdmmc::SectorSize;
static_assert(util::IsAligned(SdCardDmaBufferSize, sdmmc::SectorSize));
}
Result InitializeSdCard() {
/* Map main memory for the sdmmc device. */
AMS_SECMON_LOG("%s\n", "Initializing Device Page Table.");
InitializeDevicePageTableForSdmmc1();
AMS_SECMON_LOG("%s\n", "Initialized Device Page Table.");
/* Initialize sdmmc library. */
sdmmc::Initialize(Port);
AMS_SECMON_LOG("%s\n", "Initialized Sdmmc Port.");
sdmmc::SetSdCardWorkBuffer(Port, GetSdCardWorkBuffer(), sdmmc::SdCardWorkBufferSize);
AMS_SECMON_LOG("%s\n", "Set SD Card Work Buffer.");
R_TRY(sdmmc::Activate(Port));
AMS_SECMON_LOG("%s\n", "Activated.");
return ResultSuccess();
}
Result CheckSdCardConnection(sdmmc::SpeedMode *out_sm, sdmmc::BusWidth *out_bw) {
return sdmmc::CheckSdCardConnection(out_sm, out_bw, Port);
}
Result ReadSdCard(void *dst, size_t size, size_t sector_index, size_t sector_count) {
/* Validate that our buffer is valid. */
AMS_ASSERT(size >= sector_count * sdmmc::SectorSize);
/* Repeatedly read sectors. */
u8 *dst_u8 = static_cast<u8 *>(dst);
void * const dma_buffer = GetSdCardDmaBuffer();
while (sector_count > 0) {
/* Read sectors into the DMA buffer. */
const size_t cur_sectors = std::min(sector_count, SdCardDmaBufferSectors);
const size_t cur_size = cur_sectors * sdmmc::SectorSize;
R_TRY(sdmmc::Read(dma_buffer, cur_size, Port, sector_index, cur_sectors));
/* Copy data from the DMA buffer to the output. */
std::memcpy(dst_u8, dma_buffer, cur_size);
/* Advance. */
dst_u8 += cur_size;
sector_index += cur_sectors;
sector_count -= cur_sectors;
}
return ResultSuccess();
}