KBL Param
The sysroot buffer is a 0x100 or 0x200
sized buffer passed to the secure kernel bootloader in the scratch space and contains all sorts of flags and system parameters. This buffer is copied to the secure kernel, the non-secure kernel loader, and the non-secure kernel and is used by many functions to check for features that are enabled for the system.
Offset | Size | Description |
---|---|---|
0x0 | 0x2 | Version (usually 1) |
0x2 | 0x2 | Sysroot size (0x100 or 0x200) |
0x4 | 0x4 | Current Firmware Version |
0x8 | 0x4 | Factory Firmware Version |
0xC | 0x14 | unk |
0x20 | 0x20 | Bitfield flags |
0x40 | 0x20 | DIP Switches |
0x60 | 0x4 | DRAM base paddr (0x40000000) |
0x64 | 0x4 | DRAM size (0x20000000 on retail and testkit, 0x40000000 on DevKit) |
0x68 | 0x4 | unk |
0x6C | 0x4 | Boot type indicator 1 (0x20000 on resume - no boot logo, 0x1 on boot - boot logo, 0x4 manufacturing mode) |
0x70 | 0x10 | OpenPsId |
0x80 | 0x4 | secure_kernel.enp raw data paddr (optional)
|
0x84 | 0x4 | secure_kernel.enp size (optional)
|
0x88 | 0x8 | unk |
0x90 | 0x4 | kprx_auth_sm.self raw data paddr
|
0x94 | 0x4 | kprx_auth_sm.self size
|
0x98 | 0x4 | prog_rvk.srvk raw data paddr
|
0x9C | 0x4 | prog_rvk.srvk size
|
0xA0 | 0x8 | PSCode |
0xA8 | 0x8 | unk |
0xB0 | 0x10 | Session ID |
0xC0 | 0x4 | unk |
0xC4 | 0x4 | Wakeup factor |
0xC8 | 0x4 | unk (?Device model dependant?) (ex: 0x40, 0x60, 0x64, 0xC001C0) |
0xCC | 0x4 | unk (0x74FFFFFF on coldboot, 0x74FFBFFF on warmboot) |
0xD0 | 0x4 | Saved context paddr |
0xD4 | 0x4 | Hardware info |
0xD8 | 0x4 | Boot type indicator 2 |
0xDC | 0xC | unk |
0xE8 | 0x10 | Hardware flags |
0xF8 | 0x4 | BootLoader Revision |
0xFC | 0x4 | Sysroot Magic value (0xCBAC03AA) |
0x100 | 0x20 | Encrypted Session Key (FW 2.12+) |
Bitfield flags
Bit | Description |
---|---|
0x2C + bit 29 | Set to skip version checks in system updates |
0x2D + bit 30 | Checked by SceAppMgr. Dictates if you can pass arguments to sceAppMgrLaunchAppByPathForDriver |
QA flags
QA flags are some bit flags between 0x20 and 0x33.
boot type flags
- at 0x30: 0xFF - not update mode
- at 0x33: 0xFF - not safe mode
- at 0x35: FF on FAT - no internal storage, FE on PSTV or SLIM - internal storage
Hardware Info
Data is returned by SceSyscon.
- 00 60 41 00: PDEL-1XXX
- 00 60 40 00: PCH-10XX / PTEL-1XXXX
- 02 60 40 00: PCH-11XX
- 38 22 82 00: PCH-2XXX model revision 0x18
- 30 30 70 00: VTE-XXXX
Bit flags
Bit | Description |
---|---|
2 | PSTV Slim |
3 | PSTV Slim |
4 | Slim |
9 | Fat |
10 | always set |
11 | PSTV |
16 | Slim |
17 | PSTV Fat |
18 | PSTV |
19 | PSTV |
22 | Slim |
23 | ?Communication Processor? |
Boot type indicator 2
Experimental point of view
- No AC connected + No POWER Button pressed: 0x0
ex: rebooting by software PSVita when AC is not connected
- No AC connected + POWER Button pressed: 0x4
ex: booting PSVita by pressing POWER button when AC is not connected
- AC connected + No POWER Button pressed: 0x8
ex: rebooting by software PSVita when AC is connected
ex: autobooting PSTV/IDU PSVita by pluging AC
- AC connected + POWER Button pressed: 0xC
ex: powering off by software PSTV then booting it by pressing POWER button
ex: booting PSVita by pressing POWER button when AC is connected
Bit flags point of view
Bit | Description |
---|---|
0 | AC: connected: 1 - disconnected: 0 (note that PSTV always has AC connected) |
1 | POWER button: pressed: 1 - not pressed: 0 |
Wakeup factor
- 04 FF 00 00
- 04 00 00 00
- 00 FF 00 00
- 80 after suspend
DIP Switches
Offset | Size | Description |
---|---|---|
0x40 | 0x4 | DevKit CP timestamp 1 |
0x44 | 0x2 | DevKit CP Version |
0x46 | 0x2 | DevKit CP Build ID |
0x48 | 0x4 | DevKit CP timestamp 2 |
0x4C | 0x4 | ASLR Seed |
0x50 | 0x4 | DevKit Boot Parameters (ex: 0x80000000 or 0x80000001 or 0x80000003 or 0x81000000 or 0x81000001 OR 0x0 or 0x2 in release mode) |
0x54 | 0x4 | unk |
0x58 | 0x4 | DevKit unk flags (ex: 0x0 retail, 0x1453E7 dev mode, 0x080002 release mode) |
0x5C | 0x4 | DevKit flags 3 (ex: 0x0 retail, 0x20000010 dev mode, 0x20000000 release mode) |
Bitflags resolving
To convert the bit number to the offset and bit: offset = 0x40 + (bit_num / 32) * 4
, bit = 1 << (bit_num % 32)
.
CP Information
Bits 0-31
is a 32-bit integer of the current time on the DevKit CP clock. This is duplicated in bits 64-95
.
Bits 32-47
is a 16-bit integer of the CP version and bits 48-63
is a 16-bit integer of the CP build ID. All integers are little-endian.
On non-devkits, these fields are zero. Bits 0-63
are also usable as general purpose switches exposed with sceKernelSetDipsw
, sceKernelClearDipsw
, and sceKernelCheckDipsw
but they do not change anything in hardware (only cached values are overwritten).
User Flags
Bits 96-127
does not seem to be used in the kernel.
DevKit Boot Parameters
Bits 128-159
are used to store DevKit flags. It does not appear to be used in other models.
Bit | Description |
---|---|
152 | PS TV Emulation: On: 1 - Off: 0 |
159 | Release Check Mode: Development Mode: 1 - Release Mode: 0 |
? | Memory Size: Console Size: 1 - Development Tool Size: 0 |
Shell Flags
Bits 160-191
are used for SceShell flags.
Bit | Description |
---|
Debug Flags
Bits 192-223
are for various debugging options.
Bit | Description |
---|---|
197 | Enable kernel console logging |
211 | Enable user UART console logging |
System Flags
Bits 224-255
are used for various system options.
Bit | Description |
---|---|
229 | HDCP related? |
Hardware flags
Bit | Description |
---|---|
1 | IC Connexant: 1 - yes, 2 - no |
5 | unk |
6 | unk |
7 | unk |
14 | unk |
- all zeroes on most cases
- 47 02 on a Slim
Types
typedef struct SceBootArgs { uint16_t version; uint16_t size; uint32_t fw_version; uint32_t ship_version; uint8_t unk_C[0x14]; uint8_t bitfield_flags[0x20]; uint32_t devkit_cp_timestamp_1; uint16_t devkit_cp_version; uint16_t devkit_cp_build_id; uint32_t devkit_cp_timestamp_2; uint32_t aslr_seed; uint32_t devkit_boot_parameters; uint32_t unk_54; uint32_t devkit_unk_flags; uint32_t devkit_flags_3; uint32_t dram_base; uint32_t dram_size; uint32_t unk_68; uint32_t boot_type_indicator_1; uint8_t openpsid[0x10]; uint32_t secure_kernel_enp_addr; uint32_t secure_kernel_enp_size; uint8_t unk_88[0x8]; uint32_t kprx_auth_sm_self_addr; uint32_t kprx_auth_sm_self_size; uint32_t prog_rvk_srvk_addr; uint32_t prog_rvk_srvk_size; uint8_t pscode[0x8]; uint8_t unk_A8[0x8]; uint8_t session_id[0x10]; uint32_t unk_C0; uint32_t wakeup_factor; uint32_t unk_C8; uint32_t unk_CC; uint32_t resume_context_addr; uint32_t hardware_info; uint32_t boot_type_indicator_2; uint8_t unk_DC[0xC]; uint8_t hardware_flags[0x10]; uint32_t bootldr_revision; uint32_t magic; uint8_t session_key[0x20]; uint8_t unused[0xE0]; } __attribute__((packed)) SceBootArgs;