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Identity-map complete vga region (0xa0000 to 0xc0000) #104

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merged 2 commits into from
Mar 16, 2020
Merged

Identity-map complete vga region (0xa0000 to 0xc0000) #104

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8785c91
Mapping vga regions
RKennedy9064 Mar 13, 2020
1eaedc1
Apply suggestions from code review
RKennedy9064 Mar 14, 2020
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2 changes: 1 addition & 1 deletion src/video_mode/vga_320x200.s
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ vga_map_frame_buffer_loop:
mov [_p1 + ecx * 8], eax

add eax, 4096
cmp eax, 0xa0000 + 320 * 200
cmp eax, 0xc0000
jl vga_map_frame_buffer_loop

ret
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10 changes: 8 additions & 2 deletions src/video_mode/vga_text_80x25.s
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Expand Up @@ -11,11 +11,17 @@ config_video_mode:
.code32

vga_map_frame_buffer:
mov eax, 0xb8000
mov eax, 0xa0000
or eax, (1 | 2)
mov ecx, 0xb8000
vga_map_frame_buffer_loop:
mov ecx, eax
shr ecx, 12
mov [_p1 + ecx * 8], eax

add eax, 4096
cmp eax, 0xc0000
jl vga_map_frame_buffer_loop

ret

# print a string and a newline
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