Changes

| 0x1000

| 0x1000

| [[Configuration Memory|Shared]] page, all processes have read-access to this. Write access to this is specified by the exheader "Shared page writing" kernel flag.

| [[Configuration Memory|Shared]] page, all processes have read-access to this. Write access to this is specified by the exheader "Shared page writing" kernel flag.

|}

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All userland memory is mapped with RW permissions for privileged-mode. However, normally the ARM11 kernel only uses userland read/write instructions(or checks that the memory can be written from userland first) for accessing memory specified by [[SVC|SVCs]].

All userland memory is mapped with RW permissions for privileged-mode. However, normally the ARM11 kernel only uses userland read/write instructions(or checks that the memory can be written from userland first) for accessing memory specified by [[SVC|SVCs]].

The virtual memory located below 0x20000000 is process-unique, processes can't directly access memory for other processes. The virtual memory starting at 0x20000000 is only accessible in privileged-mode. When service [[Services API|commands]] are used, the kernel maps memory in the destination process for input/output buffers, where the addresses in the command received by the process is replaced by this mapped memory. When this is an input buffer, the buffer data is copied to the mapped memory. When this is an output buffer, the data stored in the mapped memory is copied to the destination buffer specified in the command.

Processes can't directly access memory for other processes. When service [[Services API|commands]] are used, the kernel maps memory in the destination process for input/output buffers, where the addresses in the command received by the process is replaced by this mapped memory. When this is an input buffer, the buffer data is copied to the mapped memory. When this is an output buffer, the data stored in the mapped memory is copied to the destination buffer specified in the command.

The physical address which memory for the application memory-type is mapped to begins at FCRAM+0, the total memory allocated for this memory-type is stored in [[Configuration_Memory]]. Applications' .text + .rodata + .data under the application memory-type is mapped at FCRAM + APPMEMALLOC - (aligned page-size for .text + .rodata + .data). The application .bss is mapped at CODEADDR - .bss size aligned down to the page size.

The physical address which memory for the application memory-type is mapped to begins at FCRAM+0, the total memory allocated for this memory-type is stored in [[Configuration_Memory]]. Applications' .text + .rodata + .data under the application memory-type is mapped at FCRAM + APPMEMALLOC - (aligned page-size for .text + .rodata + .data). The application .bss is mapped at CODEADDR - .bss size aligned down to the page size.