SceSdif

SceSdif is a kernel module that is primary responsible for communicating with SD devices. This includes onboard eMMC, game card MMC, wi-fi/bluetooth SDIO devices. To communicate with particular device SceSdif module uses device index (sd_ctx_index)

Device Index	Type	Description
0	MMC	onboard eMMC
1	MMC	game card
2	SDIO	wi-fi/bluetooth

There is one more index value that closely correlates with device index. This is speculated to be device type index. It is initialized by internal subroutine that does preinitialization (cmd0, cmd8, cmd5_sdio, cmd55, acmd41). Value is typically stored in sd_context_data structure in field dev_type_idx.

Device Type Index	Description
0	unknown (invalid ?)
1	MMC
2	SD
3	SDIO

Device type index will be validated when sd_context_part* will be aquired through these functions:

• get_sd_context_part_validate_mmc - device type index must be 1
• get_sd_context_part_validate_sd - device type index must be 2
• get_sd_context_part_validate_sdio - device type index must be 3

Module

Known NIDs

Version	Name	World	Privilege	NID
1.69	SceSdif	Non-secure	Kernel	0xCA882EE3
3.60	SceSdif	?	Kernel	0x2E7C52F7

Libraries

Known NIDs

Version	Name	World	Visibility	NID
1.69	SceSdifForDriver	Non-secure	Kernel	0x96D306FA
3.60	SceSdifForDriver	?	Kernel	0x96D306FA

Data segment layout

Address	Size	Description
0x0000	0x40	sdif_context_general
0x0040	0x24C0	sd_context_global (eMMC)
0x2500	0x24C0	sd_context_global (game card)
0x49C0	0x24C0	sd_context_global (wlan/bt)
0x6E80	0x398	sd_context_part_mmc (eMMC)
0x7218	0x398	sd_context_part_mmc (game card)
0x75B0	0xC0	sd_context_part_sd (unknown) used in initialize_sd_device (c1271539)
0x7670	0xC0	sd_context_part_sd (game card) used in initialize_sd_device (c1271539)
0x7730	0xC0	sd_context_part_sd (unknown) used in initialize_sd_device (c1271539)
0x77F0	0xD38	custom context used in aabaa0f0
0x8528	0xD38	custom context used in aabaa0f0
0x9260	0x398	sd_context_part_wlanbt (wlan/bt)
0x95F8	0x888	unknown
0x9E80	0x118	some wlan/bt data

Allocated blocks

During initialization step Sdif driver allocates couple of memory blocks. This happens when 'module_start' function is called, inside 'init' function.

There are 2 blocks per device context. Each block is named as SceSdif<N> where N is array index.

First block is of size 0x1000 - SceUID and void* are stored in sd_context_data per device context.

Second block is of size 0x10000 - SceUID and void* are stored in sd_context_data per device context.

It is possible that first block is DMA copied to / from corresponding SceSdif<N> physical address.

First memblock looks like to be array of 16 elements 0x100 bytes each. It is speculated that this memblock has some relation to cyclic buffer of 16 commands in sd_context_global.

Layout of single block is partially known:

typedef struct memblock_1000_element
{
   uint32_t unk_0;
   uint16_t unk_4;
   uint16_t unk_6;
   uint32_t arg_8; // sd / mmc argument
   uint16_t unk_C;
   uint16_t cmd_E; // sd / mmc derivative

   uint32_t unk_10;
   uint32_t unk_14;
   uint32_t unk_18;
   uint32_t unk_1C;

   uint32_t unk_24; //bit 0x10 is insert state, bit 0x13 is ?
   uint8_t unk_28;
   uint8_t unk_29;
   uint8_t unk_2A;
   uint8_t unk_2B;
   uint16_t unk_2C; //used to wait
   uint8_t unk_2E;
   uint8_t unk_2F; //used to wait

   uint16_t unk_30; //used to wait
   uint16_t unk_32; //used to wait
   uint16_t unk_34;
   uint16_t unk_36;
   uint16_t unk_38;
   uint16_t unk_3A;
   uint16_t unk_3C;

   uint32_t unk_40;
   uint32_t unk_48;

   uint8_t unk_54;
   uint32_t unk_58;

   uint16_t unk_80;

   uint16_t unk_FC;
}memblock_1000_element;

SceSdifForDriver

Types

typedef struct output_23a4ef01
{
    uint32_t unk_0;
    uint32_t unk_4;
    uint32_t unk_8;
    uint32_t unk_C;
} output_23a4ef01;

typedef struct output_24
{
    uint32_t unk_0;
    uint32_t unk_4;
    uint32_t unk_8;
    uint32_t unk_C;
    uint32_t unk_10;
    uint8_t unk_14;
    uint8_t unk_15;
    uint8_t unk_16;
    uint8_t unk_17;
    uint32_t unk_18;
    uint32_t unk_1C;
    uint32_t unk_20;
    uint32_t unk_24;
} output_24;

typedef struct output_76d2b87b
{
    uint32_t unk_0;
    uint32_t unk_4;
    uint16_t unk_8;
} output_76d2b87b;

typedef struct sdif_context_general //size is 0x40
{
    SceUID suspend_callback_id;
    uint32_t max_array_index; //typically 3
    uint32_t unk_8;
    uint32_t unk_C; 

    uint32_t unk_10;
    uint32_t unk_14;
    uint32_t unk_18;
    uint32_t unk_1C; 

    uint32_t unk_20;
    uint32_t unk_24;
    uint32_t unk_28;
    uint32_t unk_2C; 

    uint32_t unk_30;
    uint32_t unk_34;
    uint32_t unk_38;
    uint32_t unk_3C; 
}sdif_context_general;

typedef struct cmd_input // size is 0x240
{
   uint32_t size; // 0x240

   //bit 10 (shift left 0x15) - request invalidate flag - invalidate vaddr_1C0 and vaddr_200
   //this flag is used for CMD56 and CMD17
   //bit 20 (shift left 0xB) - request mem_188 free - free memblock with uid mem_188

   //bit 20 or bit 9 cancels invalidation (both must be clear)
   uint32_t state_flags; // interrupt handler completion flag

   uint32_t command;
   uint32_t argument;
   
   char response[0x10]; //stores normal response without command index and crc-7
                        //can also store CID or CSD. crr-7 will be cleared
                        //storage order is reversed

   void* buffer; // cmd data buffer ptr - dest for vaddr_1C0
   uint16_t flags1; // unknown
   uint16_t flags2; // unknown
   uint32_t error_code; //error from interrupt handler (confirmed)
   uint32_t unk_2C;

   uint8_t data0[0x30];   
   
   struct cmd_input* next_cmd;
   uint32_t unk_64; //some flag. must be 3 for invalidation to happen
   uint32_t array_index;
   int(*set_event_flag_callback)(void* ctx);
   
   SceUID evid; // event id SceSdif0, SceSdif1, SceSdif2 (SceSdif3 ?)
   struct cmd_input* secondary_cmd; // (when multiple commands are sent)
   struct sd_context_global* gctx_ptr;
   uint32_t unk_7C;
   
   char vaddr_80[0x80]; //3 - mapped to paddr_184 (invalidate 0x80)

   void* vaddr_100;
   uint8_t data_104[0x7C];

   uint32_t unk_180;
   void* paddr_184; //3 - phys address of vaddr_80
   SceUID mem_188; //SceSdif memblock
   uint32_t unk_18C;

   uint32_t unk_190;
   uint32_t unk_194;
   void* base_198; //dest base for vaddr_200 (also ptr for invalidate)
                   //data at base contains CMD17 data
                   //data at base also contains fragments of CMD56 response
                   //data at offset is unknown (zeroes)
   uint32_t offset_19C; //dest offset for vaddr_200 (also size for invalidate)

   uint32_t size_1A0; //size of vaddr_1C0 - only valid if request invalidate flag is set
   uint32_t size_1A4; //size of vaddr_200 - only valid if request invalidate flag is set
   void* paddr_1A8; //1 - phys address of vaddr_1C0
   void* paddr_1AC; //2 - phys address of vaddr_200

   SceInt64 wide_time; // 0x1B0
   uint32_t unk_1B8;
   uint32_t unk_1BC;

   char vaddr_1C0[0x40]; //1 - mapped to paddr_1A8 (invalidate 0x40)
                         //  - only valid if request invalidate flag is set
                         //  - contains fragments of CMD56 request/response
                         //  - does not contain CMD17 data

   char vaddr_200[0x40]; //2 - mapped to paddr_1AC (invalidate 0x40)
                         //  - only valid if request invalidate flag is set
                         //  - contains unknown data (zeroes)
} cmd_input;

typedef struct sd_context_data // size is 0xC0
{
    struct cmd_input* cmd_ptr;
    struct cmd_input* cmd_ptr_next;
    uint32_t unk_8;
    uint32_t unk_C;
    
    uint32_t dev_type_idx; // (1,2,3)
    void* ctx; //pointer to custom context (sd_context_part_mmc*, sd_context_part_sd*, sd_context_part_wlanbt*)
    uint32_t unk_18;
    uint32_t unk_1C;

    uint32_t array_idx; // (0,1,2)
    uint8_t unk_24;
    uint8_t unk_25;
    uint8_t unk_26;
    uint8_t unk_27;
    cmd_input* cmd_28;
    cmd_input* cmd_2C;

    void* membase_1000; // membase of SceSdif (0,1,2) memblock of size 0x1000
    uint32_t unk_34;
    uint32_t unk_38;
    SceUID uid_1000; // UID of SceSdif (0,1,2) memblock of size 0x1000

    SceUID evid; // event id SceSdif0, SceSdif1, SceSdif2 (SceSdif3 ?)
    uint32_t sdif_fast_mutex; // SceSdif0, SceSdif1, SceSdif2 (SceSdif3 ?)
    uint32_t unk_48;
    uint32_t unk_4C;

    uint32_t unk_50;
    uint32_t unk_54;
    uint32_t unk_58;
    uint32_t unk_5C;

    uint32_t unk_60;
    uint32_t unk_64;
    uint32_t unk_68;
    uint32_t unk_6C;

    uint32_t unk_70;
    uint32_t unk_74;
    uint32_t unk_78;
    uint32_t unk_7C;      

    //it looks like this chunk is separate structure since offset 0x2480 is used too often

    uint32_t unk_80;
    SceUID uid_10000; // UID of SceSdif (0,1,2) memblock of size 0x10000
    void* membase_10000; // membase of SceSdif (0,1,2) memblock of size 0x10000
    uint32_t unk_8C;

    uint32_t unk_90;
    int lockable_int;
    uint32_t unk_98;
    uint32_t unk_9C;

    uint32_t unk_A0;
    uint32_t unk_A4;
    uint32_t unk_A8;
    uint32_t unk_AC;

    uint32_t unk_B0;
    uint32_t unk_B4;
    uint32_t unk_B8;
    uint32_t unk_BC;
} sd_context_data;

typedef struct sd_context_part_base
{
   struct sd_context_global* gctx_ptr;
   uint32_t unk_4;
   uint32_t size; //cmd buffer size
   uint32_t unk_C; //0 for mmc however 0x200 for sd, can be size

   uint8_t unk_10; //can be padding
   uint8_t CID[15]; //this is CID data but in reverse

   uint8_t unk_20; //can be padding
   uint8_t CSD[15]; //this is CSD data but in reverse
}sd_context_part_base;

typedef struct sd_context_part_mmc // size is 0x398
{
   sd_context_part_base ctxb;
   
   uint8_t data[0x360];
   
   void* unk_390;
   uint32_t unk_394;
} sd_context_part_mmc;

typedef struct sd_context_part_sd // size is 0xC0
{
   sd_context_part_base ctxb;

   uint8_t data[0x90];
} sd_context_part_sd;

typedef struct sd_context_part_wlanbt // size is 0x398
{
   struct sd_context_global* gctx_ptr;
   
   uint8_t data[0x394];
} sd_context_part_wlanbt;

typedef struct sd_context_global // size is 0x24C0
{
    struct cmd_input commands[16];
    struct sd_context_data ctx_data;
} sd_context_global;

module_start

Version	NID
3.60	0x935cd196

int module_start();

init

Version	NID
3.60	0x0eb0ef86

int init();

deinit

Version	NID
3.60	0xe5e5f42e

int deinit();

return_error

Version	NID
3.60	0x235ad556

int return_error();

enable_slow_mode

Version	NID
3.60	0xf37cf8e5

int enable_slow_mode();

get_card_insert_state1

Version	NID
3.60	0x36a2b01b

int get_card_insert_state1(int sd_ctx_index);

get_card_insert_state2

Version	NID
3.60	0xfd9e5cfa

int get_card_insert_state2(int sd_ctx_index);

gc_cmd56_response

Version	NID
3.60	0x134e06c4

int gc_cmd56_response(sd_context_part* ctx, char* buffer, int length);

gc_cmd56_request

Version	NID
3.60	0xb0996641

int gc_cmd56_request(sd_context_part* ctx, char* buffer, int length);

get_sd_context_global

Version	NID
3.60	0xdc8f52f8

sd_context_global* get_sd_context_global(int sd_ctx_index);

get_sd_context_part_validate_mmc

Version	NID
3.60	0x6a71987f

sd_context_part* get_sd_context_part_validate_mmc(int sd_ctx_index);

get_sd_context_part_validate_sd

Version	NID
3.60	0xb9ea5b1e

sd_context_part* get_sd_context_part_validate_sd(int sd_ctx_index);

get_sd_context_part_validate_sdio

Version	NID
3.60	0x6a8235fc

sd_context_part* get_sd_context_part_validate_sdio(int sd_ctx_index);

initialize_mmc_device

Version	NID
3.60	0x22c82e79

this function only initializes devices with sd_ctx_index 0 and 1 and returns 0x80320013 on any other sd_ctx_index

it is confirmed that this function sends sequence of commands that correspond to MMC initialization protocol

int initialize_mmc_device(int sd_ctx_index, sd_context_part** result);

wlan_bt_cmd52_sdio

Version	NID
3.60	0x3428884d

int wlan_bt_cmd52_sdio(wlan_context* wlan_ctx);

wlan_bt_cmd52_sdio

Version	NID
3.60	0xe80293ef

int wlan_bt_cmd52_sdio(wlan_context* wlan_ctx);

wlan_bt_cmd52_sdio

Version	NID
3.60	0xd0f78d9b

int wlan_bt_cmd52_sdio(wlan_context* wlan_ctx, int num0, int num1, void* unk2, int num3);

wlan_bt_cmd52_sdio

Version	NID
3.60	0x3c4cdc8b

int wlan_bt_cmd52_sdio(wlan_context* wlan_ctx, int num0, int num1, void* unk2, int num3);

wlan_bt_cmd52_sdio

Version	NID
3.60	0x733bc373

int wlan_bt_cmd52_sdio(wlan_context* wlan_ctx, int num);

wlan_bt_cmd52_sdio

Version	NID
3.60	0xdece963b

int wlan_bt_cmd52_sdio(sd_context_part* ctx, int num0, int num1, void* unk2);

wlan_bt_cmd52_sdio

Version	NID
3.60	0x5d65e66b

int wlan_bt_cmd52_sdio(sd_context_part* ctx, int num0, int num1, void* unk2);

wlan_bt_cmd52_sdio

Version	NID
3.60	0xbc45c83d

int wlan_bt_cmd52_sdio(sd_context_part* ctx, int num);

wlan_bt_initialize_custom_context2

Version	NID
3.60	0xaabaa0f0

this function can send these commands: cmd3, cmd52_sdio, cmd0, cmd5_sdio, cmd55, acmd41, cmd7, cmd8

this function uses array of 2 custom contexts.

this function can either set device type index to 3 and use custom context for initialization.

or it can use preinitialization (cmd0, cmd8, cmd5_sdio, cmd55, acmd41) and then check that device type index is 3.

if device type index is not 3 then 0x80320017 error is returned.

int wlan_bt_initialize_custom_context2(int sd_ctx_index, sd_context_part** ctx);

wlan_bt

Version	NID
3.60	0x855c95e1

int wlan_bt(wlan_context* wlan_ctx, void* unk0, void* unk1);

wlan_bt

Version	NID
3.60	0x0c66e36f

int wlan_bt(sd_context_part* ctx, void* unk0);

wlan_bt_cmd7

Version	NID
3.60	0xab0222f2

int wlan_bt_cmd7(sd_context_part* ctx);

wlan_bt_cmd52_sdio

Version	NID
3.60	0x55baeb2d

int wlan_bt_cmd52_sdio(wlan_context* wlan_ctx);

wlan_bt_cmd52_sdio

Version	NID
3.60	0xfe6f3e7b

int wlan_bt_cmd52_sdio(wlan_context* wlan_ctx);

wlan_bt_cmd52_sdio

Version	NID
3.60	0xf1a24edd

int wlan_bt_cmd52_sdio(wlan_context* wlan_ctx);

wlan_bt_cmd52_sdio

Version	NID
3.60	0x1847b18c

int wlan_bt_cmd52_sdio(wlan_context* wlan_ctx);

wlan_bt_cmd52_sdio

Version	NID
3.60	0xd3c1e2b6

int wlan_bt_cmd52_sdio(wlan_context* wlan_ctx, int unk0, int unk1, int unk2);

wlan_bt_cmd52_sdio

Version	NID
3.60	0x5bac6e70

int wlan_bt_cmd52_sdio(wlan_context* wlan_ctx, int unk0, int unk1, int unk2);

wlan_bt_cmd52_sdio

Version	NID
3.60	0x01e8eb6c

int wlan_bt_cmd52_sdio(sd_context_part* ctx, char* output, int destLength_100);

wlan_bt_cmd52_sdio

Version	NID
3.60	0x763f1075

int wlan_bt_cmd52_sdio(sd_context_part* ctx);

wlan_bt_initialize_custom_context1

Version	NID
3.60	0x53962379

this function is just a wrapper for wlan_bt_initialize_custom_context2 (aabaa0f0)

int wlan_bt_initialize_custom_context1(int sd_ctx_index);

wlan_bt_cmd0

Version	NID
3.60	0x3b6ab29e

int wlan_bt_cmd0(wlan_context* wlan_ctx, void* unk0, int* result);

wlan_bt_cmd0_cmd52_sdio

Version	NID
3.60	0x180e7395

int wlan_bt_cmd0_cmd52_sdio(wlan_context* wlan_ctx, char* output, int destLength_100);

wlan_bt

Version	NID
3.60	0x0f157f49

int wlan_bt(wlan_context* wlan_ctx);

wlan_bt

Version	NID
3.60	0x849e3216

int wlan_bt(wlan_context* wlan_ctx);

wlan_bt

Version	NID
3.60	0xb05eff68

int wlan_bt(wlan_context *wlan_ctx, int unk0);

sdstor_read_sector_async

Version	NID
3.60	0x6f8d529b

int sdstor_read_sector_async(sd_context_part* ctx, int sector, char* buffer, int nSectors);

sdstor_read_sector

Version	NID
3.60	0xb9593652

int sdstor_read_sector(sd_context_part* ctx, int sector, char* buffer, int nSectors);

sdstor_write_sector_async

Version	NID
3.60	0x175543d2

int sdstor_write_sector_async(sd_context_part* ctx, int sector, char* buffer, int nSectors);

sdstor_write_sector

Version	NID
3.60	0xe0781171

int sdstor_write_sector(sd_context_part* ctx, int sector, char* buffer, int nSectors);

sdstor_copy_ctx

Version	NID
3.60	0x23a4ef01

int sdstor_copy_ctx(sd_context_part* ctx, output_23a4ef01* unk0);

sdstor_cmd0_cmd13

Version	NID
3.60	0x6cc8e28d

int sdstor_cmd0_cmd13(int sd_ctx_index);

sdstor_cmd32_cmd33_cmd38_sdio

Version	NID
3.60	0x35ba9df8

int sdstor_cmd32_cmd33_cmd38_sdio(int sd_ctx_index, int unk0);

initialize_sd_device

Version	NID
3.60	0xc1271539

it is confirmed that this function sends sequence of commands that correspond to SD initialization protocol

these commands include: cmd0, cmd8, cmd5_sdio, cmd2, cmd3, cmd6, cmd9, cmd7, cmd16

some paired commands: (cmd55, acmd41), (cmd55, acmd42), (cmd55, acmd13), (cmd55, acmd51)

there are couple of special points:

• it does not check sd_ctx_index argument.
• it uses array of 3 custom contexts instead of sd_context_part structures.
• it checks device type index after preinitialization (cmd0, cmd8, cmd5_sdio, cmd55, acmd41)
• it only initializes device with device type index 2. otherwise 0x80320017 error is returned.

int initialize_sd_device(int sd_ctx_index, int* result);

sdstor_cmd6_cmd30

Version	NID
3.60	0x995748ea

int sdstor_cmd6_cmd30(sd_context_part *input, int unk0, int unk1, void *unk2);

sdstor

Version	NID
3.60	0xe091ba2e

int sdstor(sd_context_part* unk, int unk0, int unk1, int* unk2);

sdif_write

Version	NID
3.60	0x60642f49

int sdif_write(sd_context_part *ctx, int unk0, int unk1);

sdif_write

Version	NID
3.60	0x0203ecdc

int sdif_write(sd_context_part *ctx, int unk0, int unk1);

sdif

Version	NID
3.60	0x29a71e7f

int sdif();

sdif_cmd0_cmd13

Version	NID
3.60	0x53518827

int sdif_cmd0_cmd13(sd_context_global *ctx, int *result);

sdif_cmd0

Version	NID
3.60	0x475d8e45

int sdif_cmd0(int sd_ctx_index);

sdif

Version	NID
3.60	0x3df7e207

int sdif(int sd_ctx_index, output_24* result);

sdif

Version	NID
3.60	0x76d2b87b

int sdif(int sd_ctx_index, output_76d2b87b* result);

sdif_cmd_unk

Version	NID
3.60	0xb83f7518

int sdif_cmd_unk(int sd_ctx_index, output_24* result);

sdif_cmd0_cmd16

Version	NID
3.60	0xb32776c7

int sdif_cmd0_cmd16(sd_context_part* ctx, int num_200);

sdif_cmd0_cmd16

Version	NID
3.60	0xaf702fe7

int sdif_cmd0_cmd16(sd_context_part* ctx, int num_200);