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This commit is contained in:
Kartik Agaram 2021-01-30 23:38:39 -08:00
parent 4984d92205
commit 78d3df417a
1 changed files with 5 additions and 3 deletions
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8
baremetal/boot.hex
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@ -36,10 +36,11 @@
# Don't panic! This file doesn't contain any loops or function calls. 80% of
# it is data. One pass through less than 1KB of code (there's lots of
# padding), and then we jump into a better notation. The rest of the stack
# (really only in a couple of slightly higher-level places) only needs to know
# (really only in a couple of slightly higher-level places) needs to know just
# a few magic constants:
# Video memory: start is stored at 0x8128
# Keyboard buffer: starts at 0x8028
# Buffer of mouse events: starts at 0x8090
# Outline of this file with offsets and the addresses they map to at run-time:
# -- 16-bit mode code
@ -49,14 +50,15 @@
# f8 (address 7ca0) <== gdt_descriptor
# -- 32-bit mode code
# offset 100 (address 7d00): boot code
# 1fe (address 7dfe) boot sector marker (2 bytes)
# -- 1fe (address 7dfe) boot sector marker (2 bytes)
# offset 200 (address 7e00): interrupt handler code
# offset 300 (address 7f00): mouse handler code
# -- 32-bit mode data
# offset 400 (address 8000): handler data
# 410 (address 8010): keyboard handler data
# 428 (address 8028) <== keyboard buffer
# 480 (address 8080) <== mouse buffer
# 480 (address 8080): mouse handler data
# 490 (address 8090) <== mouse buffer
# offset 500 (address 8100): video mode data (256 bytes)
# 528 (address 8128) <== start of video RAM stored here
# offset 600 (address 8200): interrupt descriptor table (1KB)