SceMsif

Module

Known NIDs

Version	Name	World	Privilege	NID
1.69	SceMsif	Non-secure	Kernel	0xFA979E8E
3.60	SceMsif	?	Kernel	0x3305A0FE

Libraries

Known NIDs

Version	Name	World	Visibility	NID
1.69	SceMsifForDriver	Non-secure	Kernel	0xB706084A
3.60	SceMsifForDriver	?	Kernel	0xB706084A

Types

typedef struct SceMsifIoReq {
	uint32_t addr;
	uint32_t unk04;
	uint32_t size_flags;
} SceMsifIoReq;

typedef struct SceMsif_fptr_table {

  //execute READ_ATRB memory access command 0x24
  int (*ms_read_atrb)(SceMsif_subctx *subctx, int sector, int nSectors, SceMsifIoReq *io_req);

  //execute READ_DATA memory access command 0x20
  int (*ms_read_sectors)(SceMsif_subctx *subctx, int sector, int nSectors, SceMsifIoReq *io_req);

  //execute WRITE_DATA memory access command 0x21
  int (*ms_write_sectors)(SceMsif_subctx *subctx, int sector, int nSectors, SceMsifIoReq *io_req);

  //size of name is 0x30 (this is exactly as in specification)
  //constructs string based on some msif register values
  //or calls fun_1 which in probably executes READ_ATRB
  //that contains manufacturer information
  int (*ms_get_model_name)(SceMsif_subctx *subctx, char* model_name);

  //execute an unknown command (0x16) through EX_SET_CMD
  int (*ms_ex_set_cmd_0x16_1)(SceMsif_subctx *subctx, int count);

  //execute FORMAT command 0x10 through EX_SET_CMD
  int (*ms_format)(SceMsif_subctx *subctx, int format);

  int (*ms_sbl_auth)(SceMsif_subctx *subctx, int num);

  //this function is called in SceMsifSleepCtrl handler and 
  //looks like it executes SLEEP command 0x11 through EX_SET_CMD
  int (*ms_sleep)(SceMsif_subctx *subctx);

  //execute STOP command 0x25 through EX_SET_CMD
  //then get Card Status register with READ_REG
  //then check SL flag
  int (*ms_stop)(SceMsif_subctx *subctx);

  //execute an unknown command (0x16) through EX_SET_CMD
  int (*ms_ex_set_cmd_0x16_2)(SceMsif_subctx *subctx);

  //this function is called after other operations and 
  //looks like it executes STOP command 0x25 through EX_SET_CMD
  int (*fun_11)(SceMsif_subctx *subctx);
} SceMsif_fptr_table;

typedef struct msif_init_ctx //size is unknown
{
   uint32_t index; // 0x0 some index or number 0, 1, 2, 3, 4, 5
   
   //...
   
   SceMsif_subctx* sub_ctx; // 0x38
   
   //...
   
}msif_init_ctx;

//this structure should be located at SceMsif_memblock1_base + 0x30
//so it is mapped to 0xE0900000

// size is unknown
//it looks like max used offset from beginning of structure is 0x70
//and min used offset from beginning of structure is -0x30

typedef struct SceMsifRegs_30 // size is unknown
{
   uint32_t unk_0;
   uint32_t unk_4;
   uint32_t evid_bits_8;
   
   //...

} SceMsifRegs_30;

typedef struct SceMsif_subctx // size is probably 0xC40
{
   uint8_t unk_0[0x400]; //buffer that is used for read ops and its physical address is used in SceMsifIoReq.addr
   
   //....

   uint8_t unk_A00[0x1A0]; //buffer

   //....
   
   SceMsifRegs_30* unk_C00;

   //....

   uint32_t unk_C10; //bits
   
   //....
   
}SceMsif_subctx;

typedef struct SceMsif_ctx //size is 0x440
{
   void* SceMsif_regs_vaddr; // 0x0
   SceUID SceMsif_regs_uid; // 0x4 - size 0x1000 - mapped to 0xE0900000
   uint32_t unk_8; // = 0
   SceUID SceMsif_evid; // 0xC
   
   fast_mutex SceMsif_fast_mutex; //0x10 - size is 0x40
   
   SceUID SceMsif_memblock_0x18000_id; // 0x50
   uint32_t unk_54;
   uint32_t intr_mutex; // 0x58 = 0 - used for suspend resume intr
   
   uint8_t unk_5C;
   uint8_t slow_mode_state; //5D = 0/1
   uint8_t system_time_0; // timewide byte
   uint8_t system_time_1; // timewide byte
   
   void* range_60; //some range that is invalidated
   uint32_t range_len_64; //length of the range
   uint32_t size_180; // 0x68 - size of data in unk_180 buffer
   uint32_t size_1C0; // 0x6C - size of data in unk_1C0 buffer
   
   void* unk180_paddr; // 0x70 - physical address of unk_180
   void* unk_1C0_paddr; // 0x74 - physical address of unk_1C0
   void* SceMsif_memblock_0x18000_vaddr; // 0x78 - size 0x18000 (0xC0 sectors of size 0x200)
   SceMsif_subctx* subctx; // 0x7C offset (840)
   
   addr_pair paddr_list_80[4];

   uint8_t unk_A0[0xE0];
   
   uint8_t unk_180[0x40]; // probably some buffer for accessing device. size confirmed.
   
   uint8_t unk_1C0[0x40]; // probably some buffer for accessing device. size confirmed.
   
   SceInt64 wide_time_intr_SceMsifSmshc; //0x200 - set in SceMsifSmshc interrupt handler
   SceInt64 wide_time; //0x208 - some time set in different functions
   
   void* SceMsif_memblock_0x18000_paddr; // 0x210 - physical address of SceMsif_memblock_0x18000
   
   uint32_t unk_214;
   
   uint8_t sector_buffer[0x200]; // 0x218 - read buffer of size 0x200 - used to read MBR and execute other single sector read ops
   
   uint32_t unk_418;
   uint32_t unk_41C;
   
   uint32_t unk_420;
   uint32_t unk_424;
   SceUID SceMsifSleepCtrl_evid; // 428
   SceUID SceMsifSleepCtrl_thid; // 42C - thread id
   
   uint32_t suspend_resume_curr_state; // 0x430 = 0
   uint32_t suspend_resume_prev_state; // 0x434 = 0
   uint32_t unk_438;
   uint32_t unk_43C;

}SceMsif_ctx;

Data segment layout

Address	Size	Description
0x0000	0x4	SceMsif_subctx* - pointer to offset 840
0x0004	0x4	pointer to data at offset 0x18
0x0008	0x4	unknown
0x000C	0x4	unknown
0x0010	0x4	pointer to table SceMsif_fptr_table of 11 function pointers
0x0014	0x4	unknown
0x0018	0x828	unknown
0x0840	0xC40	SceMsif_subctx data
0x1480	0x440	SceMsif_ctx
0x18C0	0x4	SceMsif suspend callback id
0x18C4	0x4	unknown
0x18C8	0x8	UInt64 wide time
0x18D0	0x8	UInt64 probably time in ms
0x18D8	0xE0	decrypted data - array of 8 elements of size 0x1C (0x1C is probably size of sha224)
0x19B8	0x4	flag that shows that static sha224 table is decrypted
0x19BC	0x4	F00D comm id (obtained with sceSblSmCommStartSm)

SceMsifForDriver

module_start

Version	NID
3.60	0x935cd196

int module_start();

read_sector

Version	NID
3.60	0x58654AA3

int ms_read_sector(int sector, char* buffer, int nSectors);

write_sector

Version	NID
3.60	0x329035EF

int ms_write_sector(int sector, char* buffer, int nSectors);

enable_slow_mode

Version	NID
3.60	0x4B751CE6

int ms_enable_slow_mode();

disable_slow_mode

Version	NID
3.60	0x75848756

int ms_disable_slow_mode();

get_slow_mode_state

Version	NID
3.60	0x491E25B5

int ms_get_slow_mode_state();

init1

Version	NID
3.60	0x4EA579EF

part of functionality is same as get_sha224_digest_source

int ms_init1();

init2

Version	NID
3.60	0xD0307849

int ms_init2(msif_init_ctx* ctx);

init_mbr

Version	NID
3.60	0xF997286B

int init_mbr();

get_time_from_SceMsifSmshc

Version	NID
3.60	0x855E1E38

returns wide time difference from last SceMsifSmshc interrupt

SceInt64 get_time_from_SceMsifSmshc();

ms_unk

Version	NID
3.60	0x0f86BEEA

function writes some data to the memory card.

data is taken from memblock2

int ms_unk(int sector, int nSectors);

MS Format

Version	NID
3.60	0x6EDE7DBA

int SceMsifForDriver_6EDE7DBA_format(int format_arg);

get_sha224_digest_source

Version	NID
3.60	0x718BDFDE

gets data that is used to calculate sha224 digest

this digest is used to verify static table of sha224 digests

that is decrypted internally using keys that are derived from dec_aes_key_msif

this function is also used in SceMagicGate

//sha224_ds is of size 0x10
int get_sha224_digest_source(char* sha224_ds);