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| author | H. Peter Anvin <hpa@zytor.com> | 2009-05-31 20:13:08 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-05-31 20:13:08 -0700 |
| commit | e17db13a15c22fbaa8ba4a04645f69e3f2b1e463 (patch) | |
| tree | 76aa439d3254005b52ee507a259e0e4f5acf0db4 /core/isolinux.asm | |
| parent | f92916d7e556cdf4894333b515f4ce24ca9951ea (diff) | |
| download | syslinux-e17db13a15c22fbaa8ba4a04645f69e3f2b1e463.tar.gz | |
isolinux: handle systems which disables interrupts in El Torito
At least one system has been identified which disables interrupts when
El Torito INT 13h is executed. Thus, save/restore IF around INT 13h.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'core/isolinux.asm')
| -rw-r--r-- | core/isolinux.asm | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/core/isolinux.asm b/core/isolinux.asm index 090999d2..fd18bd33 100644 --- a/core/isolinux.asm +++ b/core/isolinux.asm @@ -703,20 +703,26 @@ writechr_simple: ret ; -; int13: save all the segment registers and call INT 13h -; Some CD-ROM BIOSes have been found to corrupt segment registers. +; int13: save all the segment registers and call INT 13h. +; Some CD-ROM BIOSes have been found to corrupt segment registers +; and/or disable interrupts. ; int13: - + pushf + push bp push ds push es push fs push gs int 13h + mov bp,sp + setc [bp+10] ; Propagate CF to the caller pop gs pop fs pop es pop ds + pop bp + popf ret ; @@ -778,8 +784,8 @@ getlinsec_ebios: push ds push ss pop ds ; DS <- SS - mov ah,42h ; Extended Read - int 13h + mov ah,42h ; Extended Read + call int13 pop ds popad lea sp,[si+16] ; Remove DAPA @@ -804,7 +810,7 @@ getlinsec_ebios: pushad ; Try resetting the device xor ax,ax mov dl,[DriveNumber] - int 13h + call int13 popad loop .retry ; CX-- and jump if not zero @@ -880,7 +886,7 @@ getlinsec_cbios: mov bp,retry_count .retry: pushad - int 13h + call int13 popad jc .error .resume: |