SceSysmem

SceSysmem is a kernel module that acts as the heart of the kernel. It exports multiple libraries for different functionalities (one of the few modules that do so). SceSysmem is the first module that is loaded in the kernel load sequence and its libraries are imported by almost all other modules. See Memory for more details on the memory subsystem.

Module

This module exists in both non-secure and secure world. The non-secure world SELF can be found in os0:kd/sysmem.skprx. It also can be found in the Boot Image.

Known NIDs

Version	Name	World	Privilege	NID
1.69	SceSysmem	Non-secure	Kernel	0xB93950C6
1.69	SceSysmem	Secure	Kernel	0x502BE0E5

Libraries

This module only exports kernel libraries.

Known NIDs

Version	Name	World	Visibility	NID
1.69	SceSysmemForKernel	Non-secure	Kernel	0x63A519E5
1.69	SceSysmemForDriver	Non-secure	Kernel	0x6F25E18A
1.69	SceSysmem	Non-secure	User	0x37FE725A
1.69	SceSysmemForDebugger	Non-secure	Kernel	0xC7309957
1.69	SceDipsw	Non-secure	User	0xB36D5922
1.69	SceDipswForDriver	Non-secure	Kernel	0xC9E26388
1.69	SceUartForKernel	Non-secure	Kernel	0xC03DBE40
1.69	SceCpu	Non-secure	User	0x45265161
1.69	SceCpuForKernel	Non-secure	Kernel	0x54BF2BAB
1.69	SceCpuForDriver	Non-secure	Kernel	0x40ECDB0E
1.69	SceSysclibForKernel	Non-secure	Kernel	0x24878615
1.69	SceSysclibForDriver	Non-secure	Kernel	0x7EE45391
1.69	SceSysrootForKernel	Non-secure	Kernel	0x3691DA45
1.69	SceKernelUtilsForDriver	Non-secure	Kernel	0x496AD8B4
1.69	SceZlibForDriver	Non-secure	Kernel	0xE241534E
1.69	SceKernelSuspendForDriver	Non-secure	Kernel	0x7290B21C
1.69	SceQafMgrForDriver	Non-secure	Kernel	0x4E29D3B6
1.69	ScePmMgrForDriver	Non-secure	Kernel	0xF13F32F9
1.69	SceSblAIMgrForDriver	Non-secure	Kernel	0xFD00C69A
1.69	SceProcEventForDriver	Non-secure	Kernel	0x887F19D0
1.69	SceSysrootForDriver	Non-secure	Kernel	0x2ED7F97A
1.69	SceSysmemForTZS	Secure	Kernel	0x8680060
1.69	SceDipswForTZS	Secure	Kernel	0x9DBF584C
1.69	SceCpuForTZS	Secure	Kernel	0xC516B23E
1.69	SceSysclibForTZS	Secure	Kernel	0xC839BB78
1.69	SceSysrootForTZS	Secure	Kernel	0xFEFF641D
1.69	SceQafMgrForTZS	Secure	Kernel	0x637069DD
1.69	ScePmMgrForTZS	Secure	Kernel	0x27F1AFD8
1.69	SceSblAIMgrForTZS	Secure	Kernel	0x60D19047

Memory Block Type

The type parameter indicates what kind of memory to allocate. Here is a mapping of type flags to ARM MMU flags. Higher bits are used for other options including where to allocate from. Not all flag values are valid, there is a table of valid types in the kernel. You cannot, for example, allocate RWX memory.

Mask	Value	Description
0x10000	0x10000	Global. nG bit NOT set
0xFF00	0x800	B bit set. Sharable device memory.
0xFF00	0x2000	TEX[2] and TEX[0] bit set. Outer cache Write-back, Write-Allocate. Inner cache non-cachable.
0xFF00	0x4000	TEX[2] and B bit set. Outer cache non-cachable. Inner cache Write-back, Write-Allocate
0xFF00	0x8000	TEX[0] bit set. S bit unset. Outer and inner non-cachable. Not sharable.
0xFF00	0xD000	TEX[0] bit set. C,B bits set. Outer and inner Write-back, Write-Allocate.
0xFF	0x4	AP[2:0] = 5, XN=1. Privileged RO, User NA.
0xFF	0x5	AP[2:0] = 5. Privileged RX, User NA.
0xFF	0x6	AP[2:0] = 1, XN=1. Privileged RW, User NA.
0xFF	0x7	AP[2:0] = 1. Privileged RWX, User NA. (Never used)
0xFF	0x50	AP[2:0] = 7. Privileged RX, User RX.
0xFF	0x60	AP[2:0] = 3, XN=1. Privileged RW, User RW.
0xFF	0x40	AP[2:0] = 7, XN=1. Privileged RO, User RO.

SceSysmemForKernel

sceKernelAllocMemBlockForKernel

Version	NID
1.69 (non-secure)	0xC94850C9
1.69 (secure)	0x402EB970

struct SceKernelAllocMemKernelBlockOpt
{
    uint32_t size; // 0x34
    uint32_t unk;
    uint32_t attr;
    uint32_t unk2;
    uint32_t paddr;
    uint32_t align;
    uint32_t unk3[3];
    uint32_t processid;
    uint32_t unk4[3];
};
int sceKernelAllocMemBlockForKernel(const char *name, int32_t type, uint32_t vsize, struct SceKernelAllocMemKernelBlockOpt *pOpt);

The interface is the same as the user version of this call, however more types can be specified and more options are in the pOpt argument.

To allocate a kernel RW block of memory, specify type = 0x6020D006.

To allocate a block of memory with a specific physical address, specify type = 0x20100206, pOpt->attr = 2, and pOpt->paddr = physical address.

To allocate a block of memory that is kernel executable, specify type = 0x1020D005.

To allocate a block of memory inside the CDRAM, specify type = 0x40404006.

Unrestricted Write for Process

Unrestricted memcpy to the virtual address space for process pid. Both dst and src must be in the address space of pid but src must also be accessible in the address space of the caller. This is normally used for resolving stubs in module loads.

Version	NID
1.69 (non-secure)	0x30931572

int unrestricted_memcpy_for_pid(int pid, void *dst, void *src, size_t len);

SceSysmemForDriver

sceKernelMemcpyKernelToUser

Version	NID
1.69 (non-secure)	0x6D88EF8A

int sceKernelMemcpyKernelToUser(uint32_t uaddr, const void *kaddr, uint32_t len);

sceKernelMemcpyUserToKernel

Version	NID
1.69 (non-secure)	0xBC996A7A

int sceKernelMemcpyUserToKernel(void *kaddr, uint32_t uaddr, uint32_t len);

sceKernelMemcpyUserToKernelForPid

Version	NID
3.60 (non-secure)	0x605275F8

int sceKernelMemcpyUserToKernelForPid(int pid, void *kaddr, uint32_t uaddr, uint32_t len);

Same as above, but copies from the specified process.

strncpyKernelToUser

Version	NID
1.69 (non-secure)	0x80BD6FEB

int strncpyKernelToUser(uint32_t uaddr, const void *kaddr, uint32_t maxlen);

strncpyUserToKernel

Version	NID
1.69 (non-secure)	0xDB3EC244

int strncpyUserToKernel(void *kaddr, uint32_t uaddr, uint32_t maxlen);

strnlenUserSrc

Version	NID
1.69 (non-secure)	0xB429D419

int strnlenUserSrc(uint32_t uaddr, uint32_t maxlen);

get_paddr

Version	NID
1.69 (non-secure)	0x8D160E65
1.69 (secure)	0x1DEADF6C

int get_paddr(void *vaddr, void **result);

This will write the physical address for a virtual address vaddr to memory pointed to by result. Returns <0 on error, values >=0 indicate success.

get paddr list

Version	NID
1.69 (non-secure)	0xE68BEEBD

struct addr_pair
{
    uint32_t addr;
    uint32_t length;
};
struct paddr_list_req
{
    uint32_t size; // 0x14
    uint32_t output_buffer_size;
    uint32_t unk;
    uint32_t ret_count;
    struct addr_pair *output_buffer;
};
input.addr = vaddr;
input.length = length;
int get_paddr_list(struct addr_pair *input, struct paddr_list_req *req);

This function takes in two parameters: an array of length 2 specifying the virtual address and the size of the block of memory and a request information. The function will write into output_buffer an array of addr_pair that encompasses the block of memory specified in the input. req->ret_count will contain the number of entries written. If output_buffer is null, it will just write the count.

sceKernelGetMemBlockBaseForDriver

Version	NID
1.69 (non-secure)	0xA841EDDA

int sceKernelGetMemBlockBaseForDriver(int blkid, void **base);

sceKernelFindMemBlockByAddrForDriver

Version	NID
1.69 (non-secure)	0x8A1742F6

int sceKernelFindMemBlockByAddrForDriver(void *base, int);

Remap Block

Version	NID
1.69 (non-secure)	0xDFE2C8CB

int sysmem_remap(int blkid, int type);

This is used to remap RW memory as RX. To do this, first allocate a memory block of type 0x1020D006. After you are done writing, call this with type set to 0x1020D006.

Create Heap Pool

Version	NID
1.69 (non-secure)	0x9328E0E8

typedef struct {
    int size; // 28
    int flags; // usually 0x1 
    int unk;
    int unk;
    int block_type;
    int unk;
    int unk;
} pool_arg_t;
int heap_pool_create(const char *name, int size, pool_arg_t *opt); // opt can be NULL

The heap pool is thread safe.

Destroy Heap Pool

Version	NID
1.69 (non-secure)	0xD6437637

int heap_pool_destroy(int pool_uid);

Alloc from Heap Pool

Version	NID
1.69 (non-secure)	0x7B4CB60A

void *heap_pool_malloc(int pool_uid);

Free from Heap Pool

Version	NID
1.69 (non-secure)	0x3EBCE343

int heap_pool_free(int pool_uid, void *ptr);

Map User to Kernel

Version	NID
1.69 (non-secure)	0x7D4F8B5F

Permission is either "1" for read only, no execute or "2"/"3" for read write, no execute. Type is either 0, 1, or 17 and affects the block type. 0 is default. This will allocate kernel memory starting at kernel_page. To get the same memory as the user pointer, add the kernel_offset. kernel_size is how much is allocated.

int map_user_to_kernel(int permission, int type, void *user_buf, int size, void **kernel_page, int *kernel_size, int *kernel_offset);

Switch TTB to PID

Changes the TTBR to point to the tables for a given PID.

Version	NID
1.69 (non-secure)	0x6F2ACDAE
3.60 (non-secure)	N/A

int switch_ttb(int pid);

Write to RO for PID

Version	NID
1.69 (non-secure)	0x571D2739

int write_to_ro(int pid, void *dst, const void *src, int size);

Write to RX for PID

Same as write to RO but does a cache flush.

Version	NID
1.69 (non-secure)	0x30931572

int write_to_rx(int pid, void *dst, const void *src, int size);

Find Int for PID

Looks for an integer in user space.

Version	NID
1.69 (non-secure)	0x8334454F

int find_int(int pid, void *haystack, int needle, int size);

strnlen for PID

Version	NID
1.69 (non-secure)	0x9929EB07

int user_strnlen(int pid, char *ptr, int size);

strncpy for PID

Version	NID
1.69 (non-secure)	0x75AAF178

int user_strncpy(int pid, char *dst, const char *kern_src, int size);

memcpyk2u unchecked for PID

Version	NID
1.69 (non-secure)	0xFED82F2D

int user_memcpyk2u(int pid, void *dst, const void *kern_src, int size);

memcpyk2u checked for PID

This will not crash on invalid user pointers, but instead return error.

Version	NID
1.69 (non-secure)	0x6B825479

int user_safe_memcpyk2u(int pid, void *dst, const void *kern_src, int size);

memcpyu2u for PID

Version	NID
1.69 (non-secure)	0x8E086C33

int user_memcpyu2u(int pid, void *dst, const void *src, int size);

SceSysmem

The SceSysmem library is responsible for both low-level and high-level memory management. There are functions for allocating raw blocks of memory (similar to Linux sbrk) as well as functions for maintaining a heap-like structure (similar to malloc) for kernel, however SceLibKernel implements a proper heap and that is used for user code.

sceKernelGetMemBlockInfoByRange

Version	NID
1.69	0x6F3DB4

sceKernelSyncVMDomain

Version	NID
1.69	0x19D2A81A

sceKernelRemapMemBlock

Version	NID
1.69	0x3B29E0F5

sceKernelGetMemBlockInfoByAddr

Version	NID
1.69	0x4010AD65

sceKernelMapMemBlock

Version	NID
1.69	0x7B763A21

sceKernelGetSubbudgetInfo

Version	NID
1.69	0x832B4A65

sceKernelGetFreeMemorySize

Version	NID
1.69	0x87CC580B

sceKernelOpenMemBlock

Version	NID
1.69	0x8EB8DFBB

sceKernelOpenVMDomain

Version	NID
1.69	0x9CA3EB2B

sceKernelFindMemBlockByAddr

Version	NID
1.69	0xA33B99D1

sceKernelFreeMemBlock

Version	NID
1.69	0xA91E15EE

sceKernelCloseMemBlock

Version	NID
1.69	0xB680E3A0

sceKernelGetMemBlockBase

Version	NID
1.69	0xB8EF5818

sceKernelAllocMemBlock

Version	NID
1.69	0xB9D5EBDE

sceKernelPartialMapMemBlock

Version	NID
1.69	0xC0A59868

sceKernelPartialUnmapMemBlock

Version	NID
1.69	0xCA99929B

sceKernelCloseVMDomain

Version	NID
1.69	0xD6CA56CA

sceKernelAllocMemBlockForVM

Version	NID
1.69	0xE2D7E137

sceKernelUnmapMemBlock

Version	NID
1.69	0xEE30D976

SceCpu

This library provides wrapper for much ARM CP15 co-processor access as well as low level support of spinlocks and other synchronization primitives.

SceSysclib

The C standard library for use in the kernel only. (User code have SceLibKernel, which confusingly is user-only code). Include standard string functions (no insecure variants like strcpy).

strcmp

Version	NID
1.69 (non-secure)	0x0B33BC43

strncmp

Version	NID
1.69 (non-secure)	0x12cee649

strstr

Version	NID
1.69 (non-secure)	0x1304A69D

rshift

Version	NID
1.69 (non-secure)	0x1D89F6C0

memcpy

Version	NID
1.69 (non-secure)	0x40c88316

strchr

Version	NID
1.69 (non-secure)	0x38463759

memset2

Version	NID
1.69 (non-secure)	0x502B000D

memmove

On 1.69, this seems to be implemented incorrectly.

Version	NID
1.69 (non-secure)	0x6CC9C1A1

strrchr

Version	NID
1.69 (non-secure)	0x7F0E0835

strncat

Version	NID
1.69 (non-secure)	0xA1D1C32C

strtol

Version	NID
1.69 (non-secure)	0xAB77C5AA

snprintf

Version	NID
1.69 (non-secure)	0xAE7A8981

sceKernelStackCheckFail

Version	NID
1.69 (non-secure)	0xb997493d

strnlen

Version	NID
1.69 (non-secure)	0xCD4BD884

strlen

Version	NID
1.69 (non-secure)	0xCFC6A9AC

memcmp

Version	NID
1.69 (non-secure)	0xF939E83D

SceDipsw

sceKernelCheckDipsw

Version	NID
1.69	0x1C783FB2

sceKernelClearDipsw

Version	NID
1.69	0x800EDCC1

sceKernelSetDipsw

Version	NID
1.69	0x817053D4

SceCpu

sceKernelCpuId

Version	NID
1.69	0x2704CFEE

SceCpuForKernel

Unrestricted Write for Kernel

Unrestricted memcpy by first setting the DACR register to 0xFFFFFFFF and then doing a memcpy.

Version	NID
1.69	0x8C683DEC

int unrestricted_memcpy_for_kernel(void *dst, void *src, size_t len);

SceCpuForDriver

SceCpuForDriver_BF82DEB2_lock

Version	NID
1.60	0xBF82DEB2

int SceCpuForDriver_BF82DEB2_lock(int *addr);

SceCpuForDriver_D6ED0C46_unlock

Version	NID
1.60	0xD6ED0C46

int SceCpuForDriver_D6ED0C46_unlock(int *addr);

These two functions implement a simple mutual exclusive access on a resource addr using LDREX/STREX.

---

SceCpuForDriver_D32ACE9E_lock_int

Version	NID
3.35	0xD32ACE9E

int SceCpuForDriver_D32ACE9E_lock_int(int *addr);

SceCpuForDriver_7BB9D5DF_unlock_int

Version	NID
3.35	0x7BB9D5DF

void SceCpuForDriver_7BB9D5DF_unlock_int(int *addr, int prev_state);

Same as the pair above, but while mutex is held, interrupts are disabled. Used like this:

int prev_state = SceCpuForDriver_D32ACE9E_lock_int(mutex);
// do work
SceCpuForDriver_7BB9D5DF_unlock_int(mutex, prev_state);

---

SceCpuForDriver_4C38CE4D_lock_int_2

Version	NID
3.35	0x4C38CE4D

SceCpuForDriver_9EC91017_unlock_int_2

Version	NID
3.35	0x9EC91017

Same as the pair above, but stores 0x80000000 as the addr value instead of LR.

---

SceCpuForDriver_821FC0EE_disable_irq

Version	NID
1.60	0x821FC0EE

int SceCpuForDriver_821FC0EE_disable_irq(void);

Disables irq (but not fiq) and returns previous interrupt bit status (so either 0 or 0x80).

SceCpuForDriver_F5BAD43B_restore_irq

Version	NID
1.60	0xF5BAD43B

void SceCpuForDriver_F5BAD43B_restore_irq(int previous_state);

Restores previous irq state, pass either 0 or 0x80.

SceSysclibForDriver

__aeabi_uidiv

Version	NID
3.35	0xA9FF1205

__aeabi_uidivmod

Version	NID
3.35	0xA46CB7DE

memcpy

Version	NID
1.60	0x40C88316

memset

Version	NID
1.60	0x0AB9BF5C

strchr

Version	NID
3.35	0x38463759

strncmp

Version	NID
1.60	0x12CEE649

SceKernelUtilsForDriver

Crypto utilities

AES Init

This sets up the AES engine. ctx is a 960 byte buffer (int 1.69). blocksize and keysize is the security in bits. 128/196/256 are supported values.

Version	NID
1.69	0xF12B6451

int aes_init(void *ctx, int blocksize, int keysize, const char *key);

AES Encrypt

Encrypt with AES. There are two functions that are the same on 1.69.

Version	NID
1.69	0xC2A61770
1.69	0x302947B6

int aes_encrypt(void *ctx, const char *src, char *dst);

AES Decrypt

Decrypt with AES.

Version	NID
1.69	0xD8678061

int aes_decrypt(void *ctx, const char *src, char *dst);

SceZlibForDriver

zlib compression library.

Firmware	zlib version
1.60	1.2.5

inflate

Version	NID
1.60	0xE4F34A68

deflate

Version	NID
1.60	0xE859D60F

deflateReset

Version	NID
1.60	0x68CFEA45

crc32

Version	NID
1.60	0xE0CE06C0

adler32

Version	NID
1.60	0x98619620

inflateSetDictionary

Version	NID
1.60	0x7B16DBD6

SceKernelSuspendForDriver

Libraries can register callbacks for handling suspend/resume related events.

Register Callback

Version	NID
1.69	0x04C05D10

typedef struct {
    uint32_t size; // 24
    uint32_t unk1;
    uint32_t unk2;
    uint32_t unk3;
    uint32_t unk4;
    uint32_t unk5;
} suspend_args_t;
typedef int (*suspend_callback_t)(int resume, int eventid, suspend_args_t *args, void *opt);
int suspend_register_callback(const char *name, suspend_callback_t *callback_func, void *opt);

Registers a function for handling suspend/resume. resume is 0 if we are currently suspending and 1 if we are currently resuming. opt is passed from the registration. Registration adds an entry to a linked list and returns the block id for the new entry.

Unregister

Version	NID
1.69	0xDD61D621

int suspend_unregister(int id);

Call with the id returned from suspend_register_callback to remove the entry from the linked list and free the memory.

Make Callback

Version	NID
1.69	0xD4622EA8

int suspend_make_callback(int resume, int eventid, suspend_args_t *args, int stop_on_error);

This will go through the linked list and call each callback. If stop_on_error is set, then the first callback that returns a negative value will stop the call chain and return the block id of the callback that broke the chain. Otherwise, this function will invoke each callback and return zero.

SceQafMgrForDriver

Provides many device permission checks including Vita model checks, running app privilege checks, and so on.