diff options
| -rw-r--r-- | core/isolinux.asm | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/core/isolinux.asm b/core/isolinux.asm index 104de14a..090999d2 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 $ @@ -233,6 +231,9 @@ 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... @@ -244,8 +245,11 @@ _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 @@ -1056,7 +1060,9 @@ 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 |