Physical memory regions
| Address
|
Size
|
Description
|
| 0x0
|
0x10000
|
Bootrom (super secret code/data @ 0x8000)
|
| 0x10000
|
0x10000
|
Bootrom mirror
|
| 0x10000000
|
?
|
IO memory
|
| 0x1FF00000
|
0x80000
|
DSP memory
|
| 0x1FF80000
|
0x80000
|
AXI WRAM
|
| 0x20000000
|
0x8000000
|
FCRAM
|
ARM11 User-land memory regions
| Virtual Address
|
Region Max Size
|
Description
|
| 0x00100000 / 0x14000000
|
0x03F00000
|
The ExeFS:/.code is loaded here, executables must be loaded to the 0x00100000 region when the exheader "special memory" flag is clear. The 0x03F00000-byte size restriction only applies when this flag is clear. Executables are usually loaded to 0x14000000 when the exheader "special memory" flag is set, however this address can be arbitrary.
|
| 0x08000000
|
0x08000000
|
Heap mapped by ControlMemory
|
| 0x10000000
|
0x04000000
|
Applications usually map this region for HID
|
| 0x14000000
|
0x08000000
|
Can be mapped by ControlMemory
|
| 0x1EC00000
|
|
IO registers, the mapped IO pages which each process can access is specified in the CXI exheader.(Applications normally don't have access to registers in this range)
|
All executable pages are read-only, and data pages have the execute-never permission set. Normally .text from the loaded ExeFS:/.code is the only mapped executable memory. Executable CROs can be loaded into memory, once loaded the CRO .text section memory page permissions are changed via ControlProcessMemory from RW- to R-X. The address and size of each ExeFS:/.code section is stored in the exheader, the permissions for each section is: .text R-X, .rodata R--, .data RW-, and .bss RW-. The loaded .code is mapped to the addresses specified in the exheader by the ARM11 kernel. The stack permissions is initialized by the ARM11 kernel: RW-. The heap permissions is normally RW-.