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authorH. Peter Anvin <hpa@zytor.com>2009-05-28 23:42:55 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-05-28 23:42:55 -0700
commitdcd9ae222c665a56a57a560be62b407a04573e13 (patch)
tree9602e2a156c64e8203fa3918ca04461a8796c79c /core
parent800d06ff7b6fa7a7741a5ef41ed16795b542b787 (diff)
parent86859de5728826b6fa9e0699c3950d19a22c6c0c (diff)
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Merge branch 'master' into core32
Diffstat (limited to 'core')
-rw-r--r--core/isolinux.asm16
1 files changed, 11 insertions, 5 deletions
diff --git a/core/isolinux.asm b/core/isolinux.asm
index aab0c4fb..ab0b6109 100644
--- a/core/isolinux.asm
+++ b/core/isolinux.asm
@@ -108,14 +108,12 @@ GetlinsecPtr resw 1 ; The sector-read pointer
BIOSName resw 1 ; Display string for BIOS type
%define HAVE_BIOSNAME 1
BIOSType resw 1
+bsSecPerTrack resw 1 ; Used in hybrid mode
+bsHeads resw 1 ; Used in hybrid mode
DiskError resb 1 ; Error code for disk I/O
DriveNumber resb 1 ; CD-ROM BIOS drive number
ISOFlags resb 1 ; Flags for ISO directory search
RetryCount resb 1 ; Used for disk access retries
- alignb 8
-bsHidden resq 1 ; Used in hybrid mode
-bsSecPerTrack resw 1 ; Used in hybrid mode
-bsHeads resw 1 ; Used in hybrid mode
_spec_start equ $
@@ -235,6 +233,9 @@ bi_end:
; - EBIOS flag
; (top of stack)
;
+ ; If we had an old isohybrid, the partition offset will
+ ; be missing; we can check for that with sp >= 0x7c00.
+ ; Serious hack alert.
%ifndef DEBUG_MESSAGES
_hybrid_signature:
dd 0x7078c0fb ; An arbitrary number...
@@ -246,8 +247,11 @@ _start_hybrid:
pop dx
pop di
pop es
+ cmp sp,7C00h
+ jae .nooffset
pop dword [cs:bsHidden]
pop dword [cs:bsHidden+4]
+.nooffset:
mov si,bios_cbios
jcxz _start_common
@@ -1072,7 +1076,9 @@ bios_cbios_str db 'CHDD', 0
bios_ebios_str db 'EHDD' ,0
%endif
- alignz 4
+ alignz 8
+bsHidden dq 0 ; Used in hybrid mode
+
bios_cdrom: dw getlinsec_cdrom, bios_cdrom_str
%ifndef DEBUG_MESSAGES
bios_cbios: dw getlinsec_cbios, bios_cbios_str