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authorH. Peter Anvin <hpa@zytor.com>2009-05-31 20:13:08 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-05-31 20:13:08 -0700
commite17db13a15c22fbaa8ba4a04645f69e3f2b1e463 (patch)
tree76aa439d3254005b52ee507a259e0e4f5acf0db4 /core
parentf92916d7e556cdf4894333b515f4ce24ca9951ea (diff)
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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')
-rw-r--r--core/isolinux.asm20
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: