RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 19:57:35 +00:00
Code Issues Activity Actions

Kernel: Add basic ADMA2 support to the SD card driver

Browse source 
It only takes ~10s to fully boot with smp enabled!
This commit is contained in:
Hendiadyoin1 2023-04-03 15:59:06 +02:00 • committed by Sam Atkins
parent daf85732bc
commit 857c9b4558
5 changed files with 408 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

22
Kernel/Storage/SD/SDHostController.h
View file

@ -33,6 +33,8 @@ public:
ErrorOr<void> read_block(Badge<SDMemoryCard>, u32 block_address, u32 block_count, UserOrKernelBuffer out);
ErrorOr<void> write_block(Badge<SDMemoryCard>, u32 block_address, u32 block_count, UserOrKernelBuffer in);
void try_enable_dma();
protected:
virtual SD::HostControlRegisterMap volatile* get_register_map_base_address() = 0;
@ -78,14 +80,34 @@ private:
Read,
Write
};
enum class OperatingMode {
PIO,
ADMA2_32,
ADMA2_64
};
ErrorOr<void> transaction_control_with_data_transfer_using_the_dat_line_without_dma(SD::Command const&, u32 argument, u32 block_count, u32 block_size, UserOrKernelBuffer, DataTransferType data_transfer_type);
ErrorOr<void> transfer_blocks_adma2(u32 block_address, u32 block_count, UserOrKernelBuffer, SD::DataTransferDirection);
ErrorOr<SD::SDConfigurationRegister> retrieve_sd_configuration_register(u32 relative_card_address);
u32 make_adma_descriptor_table(u32 block_count);
volatile SD::HostControlRegisterMap* m_registers;
LockRefPtr<SDMemoryCard> m_card { nullptr };
u32 m_hardware_relative_controller_id { 0 };
OperatingMode m_mode { OperatingMode::PIO };
Mutex m_lock { "SDHostController"sv };
// For ADMA2
// One page of descriptor tables with 16 bit lengths can address writes of
// Up to 4 MiB ADMA2_32
// Up to 2 MiB ADMA2_64
// To not over allocate we use a buffer of just 16 pages
// FIXME: Investigate the average usage and adjust this
constexpr static size_t dma_rw_buffer_size = 16 * PAGE_SIZE;
constexpr static size_t dma_region_size = PAGE_SIZE + dma_rw_buffer_size;
OwnPtr<Memory::Region> m_dma_region;
};
}