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Request valid EGA console from bootloader

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Achilleas Anagnostopoulos 2017-04-24 08:44:33 +01:00 committed by GitHub
parent 5db83cd3c6
commit 4b25afd2f5
1 changed files with 8 additions and 3 deletions
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11
arch/x86/asm/multiboot_header.s
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@ -17,9 +17,15 @@ header_start:
; 32-bit unsigned sum of zero. ; 32-bit unsigned sum of zero.
dd (1 << 32) - (MAGIC + ARCH + (header_end - header_start)) dd (1 << 32) - (MAGIC + ARCH + (header_end - header_start))
; Console flags tag
align 8 ; tags should be 64-bit aligned align 8 ; tags should be 64-bit aligned
dw 4 ; type
dw 0 ; flags
dd 12 ; size
dd 0x3 ; kernel supports EGA console
; Define graphics mode tag ; Define graphics mode tag
;align 8 ; tags should be 64-bit aligned
;dw 5 ; type ;dw 5 ; type
;dw 0 ; flags ;dw 0 ; flags
;dd 20 ; size ;dd 20 ; size
@ -27,10 +33,9 @@ header_start:
;dd 25 ; height (pixels or chars) ;dd 25 ; height (pixels or chars)
;dd 0 ; bpp (0 for text mode ;dd 0 ; bpp (0 for text mode
align 8 ; tags should be 64-bit aligned
; According to page 6 of the spec, the tag list is terminated by a tag with ; According to page 6 of the spec, the tag list is terminated by a tag with
; type 0 and size 8 ; type 0 and size 8
align 8 ; tags should be 64-bit aligned
dd 0 ; type & flag = 0 dd 0 ; type & flag = 0
dd 8 ; size dd 8 ; size
header_end: header_end: