SceSdstor: Difference between revisions

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== Module ==
== Module ==
SceSdstor module does not export any functions exсept module_start.


This module is responsible for initializing all storage devices. This includes:
This module is responsible for initializing all storage devices. This includes:
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* [[Memory_Card|Memory card]]
* [[Memory_Card|Memory card]]
* USB Mass Storage
* USB Mass Storage
 
* Micro SD card / SD card
Based on layout of data segment and code of some subroutines (mbr table init, partition entry table init etc) it can be said that there are 5 devices in total. However only first 4 devices are known at the moment.


{| class="wikitable"
{| class="wikitable"
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! Version !! World !! Privilege
! Version !! World !! Privilege
|-
|-
| 1.69-3.60 || Non-secure || Kernel
| 1.69-3.740.011 || Non-secure || Kernel
|}
|}


== Libraries ==
== Libraries ==


=== Known NIDs ===
SceSdstor module does not export any function exсept module_start.
 
{| class="wikitable"
|-
! Version !! Name !! World !! Visibility !! NID
|}


== Interrupt Table ==
== Interrupt Table ==
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== Block Device Naming Rules ==
== Block Device Naming Rules ==


First level prefix: hardware device
First level prefix: port.


*int: 0 internal eMMC
{| class="wikitable"
*ext: 1 device in game card slot
|-
*gcd: 1 game card
! Name !! Index !! Long name !! Description
*mcd: 2 device in memory card slot
|-
*uma: 3 USB mass for PSTV (or pins on FAT PSVita)
| int || 0 || internal || eMMC
*usd: 4 ?
|-
*xmc: 0xFF external memory card
| ext || 1 || external || SD card
|-
| gcd || 1 || game card || Game Card
|-
| mcd || 2 || memory card || Memory Card
|-
| uma || 3 || usb mass || USB mass storage device
|-
| usd || 4 || micro sd || Micro SD card
|-
| xmc || 0xFF || external memory card || Actual Memory Card when internal eMMC is mounted as Memory Card
|}


Second level prefix: partition table related?
Second level prefix: kind


*lp - general.
*lp - general.
*pp - not general. cannot use on sceIoMount etc(need more test).
*pp - no part.


Third level prefix: active/inactive partition selection
Third level prefix: stat


*ina: inactive
*ina: inactive
*act: active
*act: active
*ign: ignore (for devices, that don't support this. but seems same to ina)
*ign: ignore (same behaviour as inactive)


Fourth level prefix: partition
Fourth level prefix: id


*unused
*unused
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*mediaid
*mediaid
*pidata
*pidata
*entire - just device entry
*entire


== Partition Block Devices ==
== Partition Block Devices ==


Each partition has numeric alias (string) that looks like to be used to reference the partition.
Each partition has a numeric alias (string) that seems to be used to reference the partition.


Numeric names most likely follow order of partitions in MBR.
Numeric names most likely follow order of partitions in MBR.
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To access device node use <code>/dev</code> prefix (like <code>/dev/gcd-lp-ign-gamero</code>).
To access device node use <code>/dev</code> prefix (like <code>/dev/gcd-lp-ign-gamero</code>).


In total there can be 16 aliases from 0 to 15 per physical device (eMMC, Game Card, Memory Card). Alias 16 is hardcoded and is called <code>entire</code>.
There can be up to 16 aliases from 0 to 15 per physical device (eMMC, Game Card, Memory Card) and alias 16 is hardcoded and called <code>entire</code>.


Aliases 000-015 correspond to eMMC partitions.
Not all numeric names are fixed but <code>entire</code> numeric names are hardcoded.
 
Aliases 016 correspond to eMMC.
 
Aliases 100-115 correspond to Game Card partitions.
 
Aliases 116 correspond to Game Card or SdCard.
 
Aliases 200-215 correspond to Memory Card partitions.
 
Aliases 216 correspond to Memory Card.
 
Not all numeric names are fixed except for hardcoded ones.


{| class="wikitable"
{| class="wikitable"
|-
|-
! block device !! numeric name !! hardcoded
! Block device !! Numeric name !! Hardcoded
|-
|-
| int-lp-ign-idstor || 000 || n
| int-lp-ign-idstor || 000 || no
|-
|-
| int-lp-act-sloader/int-lp-ina-sloader || 001 || n
| int-lp-act-sloader/int-lp-ina-sloader || 001 || no
|-
|-
| - || 002 || n
| int-lp-act-sloader/int-lp-ina-sloader || 002 || no
|-
|-
| int-lp-act-os/int-lp-ina-os || 003 || n
| int-lp-act-os/int-lp-ina-os || 003 || no
|-
|-
| - || 004 || n
| int-lp-act-os/int-lp-ina-os || 004 || no
|-
|-
| int-lp-ign-sysdata || 005 || n
| int-lp-ign-sysdata || 005 || no
|-
|-
| int-lp-ign-vtrm || 006 || n
| int-lp-ign-vtrm || 006 || no
|-
|-
| int-lp-ign-vsh || 007 || n
| int-lp-ign-vsh || 007 || no
|-
|-
| int-lp-ign-vshdata || 008 || n
| int-lp-ign-vshdata || 008 || no
|-
|-
| int-lp-ign-updater || 009 || n
| int-lp-ign-updater || 009 || no
|-
|-
| int-lp-ign-pidata || 010 || n
| int-lp-ign-pidata || 010 || no
|-
|-
| int-lp-ign-user || 011 || n
| int-lp-ign-user || 011 || no
|-
|-
| int-lp-ign-userext || 012 || n
| int-lp-ign-userext || 012 || no
|-
|-
| int-lp-act-entire || 016 || y
| int-lp-act-entire || 016 || yes
|-
|-
| gcd-lp-ign-gamero, gcd-lp-act-mediaid (need to confirm) || 100 || n
| gcd-lp-ign-gamero, gcd-lp-act-mediaid (need to confirm) || 100 || no
|-
|-
| gcd-lp-ign-gamerw (need to confirm) || 101 || n
| gcd-lp-ign-gamerw (need to confirm) || 101 || no
|-
|-
| ext-lp-act-entire || 116 || y
| ext-lp-act-entire || 116 || yes
|-
|-
| mcd-lp-act-mediaid || 200 || n
| mcd-lp-act-mediaid || 200 || no
|-
|-
| - || 201 || n
| mcd-lp-ign-userext || 201 || no
|-
|-
| mcd-lp-act-entire || 216 || y
| mcd-lp-act-entire || 216 || yes
|-
|-
| uma-lp-act-entire || 316 || yes
|-
| usd-lp-act-entire || 416 || yes
|}
|}


== Types ==
== Types ==


Looks like SceSdstor driver uses its own device type
It looks like SceSdstor driver uses its own device type.


{| class="wikitable"
{| class="wikitable"
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| 3  
| 3  
| USB Mass Storage
| USB Mass Storage
|-
|}
|}


<source lang="c">
Also see [https://github.com/vitasdk/vita-headers/blob/master/include/psp2kern/internal/sdstor.h here (vita-headers)]
typedef struct partition_entry_raw
{
  uint32_t partitionOffset;
  uint32_t partitionSize;
  uint8_t partitionCode;
  uint8_t partitionType;
  uint8_t partitionActive;
  uint32_t flags;
  uint16_t unk;
}partition_entry_raw;
 
typedef struct partition_entry //size is 0x1C
{
  uint32_t partitionOffset; //from MBR
  uint32_t partitionSize; //from MBR
  sdstor_mbr_ctx* ctx;
  partition_entry_raw* partitionEntryPtr; //pointer to raw partition entry in MBR
  char numericName[4]; //null terminated name (000, 001, ...)
  uint32_t flags1; //from MBR
  uint16_t unk2;　 //from MBR
  uint16_t unk3; //?
}partition_entry;
 
typedef struct sdstor_mbr_ctx //size is 0x238
{
fast_mutex fast_mutex_SceSdStorPartitionTable; //size is 0x40


uint32_t unk_40; //maybe sector size ?
<source lang="C">
sd_stor_device* dev;
typedef struct unknown_1C2C { // size is 0x1C
uint32_t unk_48; //maybe sector size ?
uint32_t unk_4C;
 
uint32_t unk_50;
void* mbr_ptr; //pointer to corresponding MBR record in array (offset 0x40)
partition_entry partitions[17]; // 16 real partition entries from MBR + some hardcoded 17th partition entry
uint8_t unk_234; //some initialization flag (0, 1, 2)
uint8_t unk_235;
uint8_t unk_236; //some initialization flag (set to 0 if partition table is initialized)
uint8_t unk_237;
}sdstor_mbr_ctx;
 
//named after "SceSdStorDevice" mutex
typedef struct sd_stor_device //size is 0x54
{
  fast_mutex fast_mutex_SceSdStorDevice; //size is 0x40
 
  char index1; // (0x00, 0x01, 0xFF, 0xFF, 0x03) // sd ctx index used to get sd_context_part* (0, 1 confirmed) (3 unknown)
  char index2; // (0x00, 0x00 / 0x01, 0x02, 0x03, 0x01) // device type idx , not related to sdif type!
  char unk_42; // (0, 1) looks like init flag. 1 means that device is initialized and can be accessed
  char unk_43;
 
  uint32_t unk_44;
  uint32_t unk_48;
  uint32_t unk_4C;
 
  void* devCtx; //pointer to dev ctx (sd_context_part_mmc*) or zero
}sd_stor_device;
 
//named after SceSdStorDeviceHandle mutex and pool
typedef struct sd_stor_device_handle //size is 0x58
{
  fast_mutex fast_mutex_SceSdStorDeviceHandle; //size is 0x40
 
  uint32_t unk_40; //maybe sector size ?
  uint32_t partitionOffset;
  uint32_t partitionSize;
  uint32_t unk_4C;
 
  partition_entry* pentry;
  sd_stor_device* dev;
}sd_stor_device_handle;
 
typedef struct unknown_1C2C //size is 0x1C
{
   uint8_t data[0x1C];
   uint8_t data[0x1C];
}unknown_1C2C;
} unknown_1C2C;


#define CARD_REMOVE_SDSTOR_REQUEST_EVENT_FLAG 0x01
#define CARD_REMOVE_SDSTOR_REQUEST_EVENT_FLAG 0x01
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#define RESUME_SDSTOR_REQUEST_EVENT_FLAG 0x1000
#define RESUME_SDSTOR_REQUEST_EVENT_FLAG 0x1000


typedef struct interrupt_argument //size is 0x28
typedef struct interrupt_argument { // size is 0x28
{
   uint32_t unk_0;
   uint32_t unk_0;
   SceUID SceSdstorRequest_evid; // event id
   SceUID SceSdstorRequest_evid; // event id
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   unknown_1C2C* unk_10;
   unknown_1C2C* unk_10;


   //card swap protection
   // card swap protection
   char cid_rnd[0x10]; // cid of the card / randomly generated non zero byte array / zero
   char cid_rnd[0x10]; // cid of the card / randomly generated non zero byte array / zero


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#define SDSTOR_SUBINTERRUPT_CODE_REMOVE 1
#define SDSTOR_SUBINTERRUPT_CODE_REMOVE 1


typedef struct interrupt_info //size is 0xC
typedef struct interrupt_info { // size is 0xC
{
   insert_handler* SceSdstorCardInsert_handler;
   insert_handler* SceSdstorCardInsert_handler;
   remove_handler* SceSdstorCardRemove_handler;
   remove_handler* SceSdstorCardRemove_handler;
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   uint8_t SceSdstorCardInsert_subintr_code;
   uint8_t SceSdstorCardInsert_subintr_code;
   uint8_t SceSdstorCardRemove_subintr_code;
   uint8_t SceSdstorCardRemove_subintr_code;
   uint8_t unk_B;
   uint8_t unk_0xB;
} interrupt_info;
} interrupt_info;


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| 0x0040 || 0x200 || [[Partitions#Master Block|MBR]] of [[EMMC|eMMC]]
| 0x0040 || 0x200 || [[Partitions#Master Block|MBR]] of [[EMMC|eMMC]]
|-
|-
| 0x0240 || 0x200 || [[Partitions#Master Block|MBR]] of [[Game_Card|Game gard]]
| 0x0240 || 0x200 || [[Partitions#Master Block|MBR]] of [[Game_Card|Game card]]
|-
|-
| 0x0440 || 0x200 || [[Partitions#Master Block|MBR]] of [[Memory_Card|Memory card]]
| 0x0440 || 0x200 || [[Partitions#Master Block|MBR]] of [[Memory_Card|Memory card]]
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| 0x0640 || 0x200 || [[Partitions#Master Block|MBR]] of USB Mass Storage
| 0x0640 || 0x200 || [[Partitions#Master Block|MBR]] of USB Mass Storage
|-
|-
| 0x0840 || 0x200 || unknown (most likely for MBR since there are 5 elements in all arrays)
| 0x0840 || 0x200 || [[Partitions#Master Block|MBR]] of micro SD card (usd device)
|-
|-
| 0x0A40 || 0x238 || sdstor_mbr_ctx element 0
| 0x0A40 || 0x238 || sdstor_mbr_ctx element 0
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| 0x1CB8 || 0x8 || unknown
| 0x1CB8 || 0x8 || unknown
|-
|-
| 0x1CC0 || 0x200 || [[Partitions#Master Block|MBR]] of [[Game_Card|Game card]]
| 0x1CC0 || 0x200 || [[Partitions#Master Block|MBR]] of [[Memory_Card|Memory card]] (xmc device)
|-
|}
|}


== SceSdstor ==
[[Category:ARM]]
 
[[Category:Kernel]]
=== module_start ===
{| class="wikitable"
|-
! Version !! NID
|-
| 3.60 || 0x935cd196
|}
 
<source lang="c">int module_start();</source>
 
 
[[Category:Modules]]
[[Category:Modules]]
[[Category:Kernel]]

Latest revision as of 11:43, 13 November 2023

Module

This module is responsible for initializing all storage devices. This includes:

Version World Privilege
1.69-3.740.011 Non-secure Kernel

Libraries

SceSdstor module does not export any function exсept module_start.

Interrupt Table

Index Code Name
0 0xDC SceSdif0
1 0xDD SceSdif1
2 0x3C SceMsifIns
3 0xF SceUsbMass
4 0xDF SceSdif3

Block Device Naming Rules

First level prefix: port.

Name Index Long name Description
int 0 internal eMMC
ext 1 external SD card
gcd 1 game card Game Card
mcd 2 memory card Memory Card
uma 3 usb mass USB mass storage device
usd 4 micro sd Micro SD card
xmc 0xFF external memory card Actual Memory Card when internal eMMC is mounted as Memory Card

Second level prefix: kind

  • lp - general.
  • pp - no part.

Third level prefix: stat

  • ina: inactive
  • act: active
  • ign: ignore (same behaviour as inactive)

Fourth level prefix: id

  • unused
  • idstor
  • sloader
  • os
  • vsh
  • vshdata
  • vtrm
  • user
  • userext
  • gamero
  • gamerw
  • updater
  • sysdata
  • mediaid
  • pidata
  • entire

Partition Block Devices

Each partition has a numeric alias (string) that seems to be used to reference the partition.

Numeric names most likely follow order of partitions in MBR.

To access device node use /dev prefix (like /dev/gcd-lp-ign-gamero).

There can be up to 16 aliases from 0 to 15 per physical device (eMMC, Game Card, Memory Card) and alias 16 is hardcoded and called entire.

Not all numeric names are fixed but entire numeric names are hardcoded.

Block device Numeric name Hardcoded
int-lp-ign-idstor 000 no
int-lp-act-sloader/int-lp-ina-sloader 001 no
int-lp-act-sloader/int-lp-ina-sloader 002 no
int-lp-act-os/int-lp-ina-os 003 no
int-lp-act-os/int-lp-ina-os 004 no
int-lp-ign-sysdata 005 no
int-lp-ign-vtrm 006 no
int-lp-ign-vsh 007 no
int-lp-ign-vshdata 008 no
int-lp-ign-updater 009 no
int-lp-ign-pidata 010 no
int-lp-ign-user 011 no
int-lp-ign-userext 012 no
int-lp-act-entire 016 yes
gcd-lp-ign-gamero, gcd-lp-act-mediaid (need to confirm) 100 no
gcd-lp-ign-gamerw (need to confirm) 101 no
ext-lp-act-entire 116 yes
mcd-lp-act-mediaid 200 no
mcd-lp-ign-userext 201 no
mcd-lp-act-entire 216 yes
uma-lp-act-entire 316 yes
usd-lp-act-entire 416 yes

Types

It looks like SceSdstor driver uses its own device type.

Device Type Index Description
0 MMC card
1 SD card
2 Memory Card
3 USB Mass Storage

Also see here (vita-headers) 

typedef struct unknown_1C2C { // size is 0x1C
   uint8_t data[0x1C];
} unknown_1C2C;

#define CARD_REMOVE_SDSTOR_REQUEST_EVENT_FLAG 0x01
#define IO_DEVCTL_SDSTOR_REQUEST_EVENT_FLAG 0x02
#define CARD_INSERT_SDSTOR_REQUEST_EVENT_FLAG 0x10
#define SUSPEND_SDSTOR_REQUEST_EVENT_FLAG 0x100
#define RESUME_SDSTOR_REQUEST_EVENT_FLAG 0x1000

typedef struct interrupt_argument { // size is 0x28
  uint32_t unk_0;
  SceUID SceSdstorRequest_evid; // event id
  SceUID SceSdstorOpSync_evid; // event id
  interrupt_info* intr_info; // 
  
  unknown_1C2C* unk_10;

  // card swap protection
  char cid_rnd[0x10]; // cid of the card / randomly generated non zero byte array / zero

  uint8_t intr_table_index; // check interrupt table section (also sd_stor_device index)
  uint8_t unk_25; // = 0
  uint8_t unk_26; // = 0
  uint8_t unk_27;
} interrupt_argument;

typedef int(insert_handler)(int unk, interrupt_argument* arg);

typedef int(remove_handler)(int unk, interrupt_argument* arg);

#define SDSTOR_SUBINTERRUPT_CODE_INSERT 0
#define SDSTOR_SUBINTERRUPT_CODE_REMOVE 1

typedef struct interrupt_info { // size is 0xC
   insert_handler* SceSdstorCardInsert_handler;
   remove_handler* SceSdstorCardRemove_handler;
   uint8_t intr_table_index; // check interrupt table section
   uint8_t SceSdstorCardInsert_subintr_code;
   uint8_t SceSdstorCardRemove_subintr_code;
   uint8_t unk_0xB;
} interrupt_info;

Data segment layout

Address Size Description
0x0000 0x20 unknown
0x0020 0x14 array of 5 integers (number created device handles?) (each corresponds to sd_stor_device)
0x0034 0x4 unknown
0x0038 0x4 SceSdStorDeviceHandle mempool SceUID of size 0x2000
0x003C 0x4 unknown
0x0040 0x200 MBR of eMMC
0x0240 0x200 MBR of Game card
0x0440 0x200 MBR of Memory card
0x0640 0x200 MBR of USB Mass Storage
0x0840 0x200 MBR of micro SD card (usd device)
0x0A40 0x238 sdstor_mbr_ctx element 0
0x0C78 0x238 sdstor_mbr_ctx element 1
0x0EB0 0x238 sdstor_mbr_ctx element 2
0x10E8 0x238 sdstor_mbr_ctx element 3
0x1320 0x238 sdstor_mbr_ctx element 4
0x1558 0x54 sd_stor_device element 0
0x15AC 0x54 sd_stor_device element 1
0x1600 0x54 sd_stor_device element 2
0x1654 0x54 sd_stor_device element 3
0x16A8 0x54 sd_stor_device element 4
0x16FC 0x20 vfs_add_data sdstor_dev_fs node
0x171C 0x04 SceSdStorVfs mempool SceUID of size 0x2000
0x1720 0x200 first sector of external partition (0xD) (gcd-lp-act-mediaid) of game card (interrupt index 1)
0x1920 0x200 first sector of external partition (0xD) (mcd-lp-act-mediaid) of memory card (interrupt index 2)
0x1B20 0xC8 array of 5 interrupt_argument structures
0x1BE8 0x8 suspend_register_callback opt
0x1BF0 0x3C array of 5 interrupt_info structures
0x1C2C 0x8C array of 5 unknown_1C2C structures
0x1CB8 0x8 unknown
0x1CC0 0x200 MBR of Memory card (xmc device)
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