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Increase stack size to 4096

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Philipp Oppermann
2015-11-14 13:20:18 +01:00
parent 2d1c801c72
commit fc389c9e9e
2 changed files with 12 additions and 1 deletions
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11
posts/DRAFT-allocating-frames.md
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@@ -5,6 +5,17 @@ title: 'Allocating Frames'
TODO
## Preparation
We still have a really tiny stack of 64 bytes, which won't suffice for this post. So we will increase it to 4096 (one page) in `boot.asm`:
```asm
section .bss
...
stack_bottom:
resb 4096
stack_top:
```
## The Multiboot Information Structure
When a Multiboot compliant bootloader loads a kernel, it passes a pointer to a boot information structure in the `ebx` register. We can use it to get information about available memory and loaded kernel sections.

2
src/arch/x86_64/boot.asm
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@@ -152,7 +152,7 @@ p3_table:
p2_table:
resb 4096
stack_bottom:
resb 64
resb 4096
stack_top:
section .rodata