Memory layout: Difference between revisions
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==NATIVE_FIRM ARM9 kernel | ==ARM9 MPU regions== | ||
For the below instruction permissions: RO = memory is executable, while None = not-executable. | |||
===NATIVE_FIRM ARM9 kernel=== | |||
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The above is the MPU region settings setup by the ARM9-kernel in the crt0. | The above is the MPU region settings setup by the ARM9-kernel in the crt0. | ||
The New3DS ARM9-kernel MPU region settings are the same as the Old3DS MPU region settings for >=[[8.0.0-18|8.0.0-X]]. | The New3DS ARM9-kernel MPU region settings are the same as the Old3DS MPU region settings for >=[[8.0.0-18|8.0.0-X]]. | ||
At the start of the Process9 function executed in kernel-mode via svc7b during firm-launching, it changes some MPU region settings. At the end of that function, before it uses the ARM9/ARM11 entrypoint fields, it disables MPU. | At the start of the Process9 function executed in kernel-mode via svc7b during firm-launching, it changes some MPU region settings. At the end of that function, before it uses the ARM9/ARM11 entrypoint fields, it disables MPU. | ||
===New3DS [[FIRM|ARM9-loader]]=== | |||
{| class="wikitable" border="1" | |||
|- | |||
! Region | |||
! Address | |||
! Size | |||
! Privileged-mode data permissions | |||
! User-mode data permissions | |||
! Privileged-mode instruction permissions | |||
! User-mode instruction permissions | |||
|- | |||
| 0 | |||
| 0xFFFF0000 | |||
| 32KB/0x8000 | |||
| RO | |||
| None | |||
| RO | |||
| None | |||
|- | |||
| 1 | |||
| 0x01FF8000 | |||
| 32KB/0x8000 | |||
| RW | |||
| None | |||
| RO | |||
| None | |||
|- | |||
| 2 | |||
| 0x08000000 | |||
| 2MB/0x200000 | |||
| RW | |||
| None | |||
| RO | |||
| None | |||
|- | |||
| 3 | |||
| 0x10000000 | |||
| 128KB/0x20000 | |||
| RW | |||
| None | |||
| None | |||
| None | |||
|} | |||
MPU regions 4-7 are disabled. Note that the entire ARM9-loader runs in SVC-mode. | |||
==ARM9 ITCM== | ==ARM9 ITCM== | ||