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| author | H. Peter Anvin <hpa@zytor.com> | 2009-05-14 16:33:37 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-05-14 16:33:37 -0700 |
| commit | 0046660e3849bef9d922ba69d07c5bc639d1d133 (patch) | |
| tree | 0d60efb691e622912682b7bab367a51ce8ead76e /core/adv.inc | |
| parent | 1c7146a2eeaaf0021cc15e682e12609a652ed870 (diff) | |
| download | syslinux-0046660e3849bef9d922ba69d07c5bc639d1d133.tar.gz | |
core: handle more than 32K of code for disk-based derivatives
Handle more than 32K worth of code for disk-based derivatives. We do
this by allowing the sector pointers to overflow past sector 1; this
is OK because we limit a run to be based on only the pointers that we
have read so far.
XXX: This is implemented for EXTLINUX, but breaks SYSLINUX. Need to
update (and unify!) the SYSLINUX installers to cope.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'core/adv.inc')
| -rw-r--r-- | core/adv.inc | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/core/adv.inc b/core/adv.inc index c1a2628e..cfb39bdc 100644 --- a/core/adv.inc +++ b/core/adv.inc @@ -67,24 +67,26 @@ adv_init: cmp byte [ADVDrive],-1 jne adv_read -;%if IS_SYSLINUX || IS_MDSLINUX || IS_EXTLINUX -%if IS_EXTLINUX ; Not yet implemented for the other derivatives +%if IS_SYSLINUX || IS_EXTLINUX + cmp word [ADVSectors],2 ; Not present? + jb adv_verify + ; ; Update pointers to default ADVs... ; - mov bx,[LDLSectors] + mov bx,[DataSectors] shl bx,2 mov ecx,[bsHidden] - mov eax,[bx+SectorPtrs-8] - mov edx,[bx+SectorPtrs-4] + mov eax,[bx+SectorPtrs] ; First ADV sector + mov edx,[bx+SectorPtrs+4] ; Second ADV sector add eax,ecx add edx,ecx mov [ADVSec0],eax mov [ADVSec1],edx mov al,[DriveNumber] mov [ADVDrive],al + jmp adv_read %endif - ; ** fall through to adv_verify ** ; ; Initialize the ADV data structure in memory |