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Update stivale specifications

This commit is contained in:
mintsuki 2020-09-11 16:35:14 +02:00
parent 2e537412d3
commit 859a10b142
2 changed files with 14 additions and 10 deletions
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15
STIVALE.md
View File

@ -36,12 +36,15 @@ The kernel MUST NOT request to load itself at an address lower than `0x100000`
field in the stivale header is set to a non-0 value, in which case, it is set to
the value of `entry_point`.
At entry, the bootloader will have setup paging such that there is a 4GiB identity
mapped block of memory at `0x0000000000000000`, a 2GiB mapped area of memory
that maps from `0x0000000000000000` physical to `0x0000000080000000` physical
to `0xffffffff80000000` virtual. This area is for the higher half kernels.
Further more, a 4GiB area of memory from `0x0000000000000000` physical to
`0x0000000100000000` physical to `0xffff800000000000` virtual is mapped.
At entry, the bootloader will have setup paging mappings as such:
```
Base Physical Address - Size -> Virtual address
0x0000000000000000 - 4 GiB plus any additional memory map entry -> 0x0000000000000000
0x0000000000000000 - 4 GiB plus any additional memory map entry -> 0xffff800000000000 (4-level paging only)
0x0000000000000000 - 4 GiB plus any additional memory map entry -> 0xff00000000000000 (5-level paging only)
0x0000000000000000 - 0x80000000 -> 0xffffffff80000000
```
If the kernel is dynamic and not statically linked, the bootloader will relocate it.
Furthermore if bit 2 of the flags field in the stivale header is set, the bootloader

9
STIVALE2.md
View File

@ -39,10 +39,11 @@ the value of `entry_point`.
At entry, the bootloader will have setup paging mappings as such:
```
Base Physical Address - Top Physical Address -> Virtual address
0x0000000000000000 - 0x0000000100000000 -> 0x0000000000000000
0x0000000000000000 - 0x0000000100000000 -> 0xffff800000000000
0x0000000000000000 - 0x0000000080000000 -> 0xffffffff80000000
Base Physical Address - Size -> Virtual address
0x0000000000000000 - 4 GiB plus any additional memory map entry -> 0x0000000000000000
0x0000000000000000 - 4 GiB plus any additional memory map entry -> 0xffff800000000000 (4-level paging only)
0x0000000000000000 - 4 GiB plus any additional memory map entry -> 0xff00000000000000 (5-level paging only)
0x0000000000000000 - 0x80000000 -> 0xffffffff80000000
```
If the kernel is dynamic and not statically linked, the bootloader will relocate it.