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check for the support bitmap in stage1.

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okuji 1999-11-16 05:58:37 +00:00
parent a40c3176c2
commit a6d7cb06db
2 changed files with 12 additions and 1 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
1999-11-16 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>
From Pavel Roskin:
* stage1/stage1.S: Check for the API subset support bitmap
returned by INT 13 AH=48h, and jump to chs_mode if AH=42h is not
supported.
1999-11-13 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp> 1999-11-13 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>
* stage2/builtins.c (install_func): When using a Stage 1.5, set * stage2/builtins.c (install_func): When using a Stage 1.5, set

6
stage1/stage1.S
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@ -147,7 +147,11 @@ real_start:
jc chs_mode jc chs_mode
cmpw $0xaa55, %bx cmpw $0xaa55, %bx
jne chs_mode jne chs_mode
/* check if AH=0x42 is supported */
andw $1, %cx
jz chs_mode
/* get the geometry (limited to 2TB!) */ /* get the geometry (limited to 2TB!) */
movb $0x48, %ah movb $0x48, %ah
movw $STAGE1_DRP_ADDR, %si movw $STAGE1_DRP_ADDR, %si