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Lee Lup Yuen 2023-11-11 20:11:31 +08:00
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@ -1918,7 +1918,7 @@ TODO
From the [MMU Log](https://gist.github.com/lupyuen/73906723edf5f1611c7829779b18668a)
map I/O regions: (Level 1)
__Map I/O regions: (Level 1)__
```text
mmu_ln_map_region:
@ -1930,7 +1930,9 @@ mmu_ln_setentry:
ptlevel=1, lnvaddr=0x50406000, paddr=0x40000000, vaddr=0x40000000, mmuflags=0x26
```
map PLIC: (Level 1)
`mmuflags=0x26` means Read + Write + Global
__Map PLIC: (Level 1)__
```text
mmu_ln_map_region:
@ -1939,7 +1941,9 @@ mmu_ln_setentry:
ptlevel=1, lnvaddr=0x50406000, paddr=0xe0000000, vaddr=0xe0000000, mmuflags=0x26
```
map kernel text: (Levels 2 & 3)
`mmuflags=0x26` means Read + Write + Global
__Map kernel text: (Levels 2 & 3)__
```text
mmu_ln_setentry:
@ -1954,7 +1958,11 @@ mmu_ln_setentry: ptlevel=3, lnvaddr=0x50403000, paddr=0x503fe000, vaddr=0x503fe0
mmu_ln_setentry: ptlevel=3, lnvaddr=0x50403000, paddr=0x503ff000, vaddr=0x503ff000, mmuflags=0x2a
```
map kernel data: (Levels 2 & 3)
`mmuflags=0x0` means PTE is a pointer to the next level of the page table
`mmuflags=0x2a` means Read + Execute + Global
__Map kernel data: (Levels 2 & 3)__
```text
mmu_ln_setentry:
@ -1969,14 +1977,20 @@ mmu_ln_setentry: ptlevel=3, lnvaddr=0x50404000, paddr=0x505fe000, vaddr=0x505fe0
mmu_ln_setentry: ptlevel=3, lnvaddr=0x50404000, paddr=0x505ff000, vaddr=0x505ff000, mmuflags=0x26
```
connect the L1 and L2 page tables:
`mmuflags=0x0` means PTE is a pointer to the next level of the page table
`mmuflags=0x26` means Read + Write + Global
__Connect the L1 and L2 page tables:__
```text
mmu_ln_setentry:
ptlevel=1, lnvaddr=0x50406000, paddr=0x50405000, vaddr=0x50200000, mmuflags=0x20
```
map the page pool: (Level 2)
`mmuflags=0x20` means PTE_G: Page is a Global Mapping
__Map the page pool: (Level 2)__
```text
mmu_ln_map_region:
@ -1991,6 +2005,8 @@ mmu_ln_setentry: ptlevel=2, lnvaddr=0x50405000, paddr=0x51600000, vaddr=0x516000
mmu_ln_setentry: ptlevel=2, lnvaddr=0x50405000, paddr=0x51800000, vaddr=0x51800000, mmuflags=0x26
```
`mmuflags=0x26` means Read + Write + Global
# Documentation for Ox64 BL808
- ["Ox64 BL808 RISC-V SBC: Booting Linux and (maybe) Apache NuttX RTOS"](https://lupyuen.github.io/articles/ox64)