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Also capture INT 19 as a failure path, to allow for boot sectors that 

don't conform to BBS (e.g. the one created by mkdosfs).
This commit is contained in:
Michael Brown 2006-05-14 14:13:55 +00:00
parent 4435667a00
commit 6e42cb95bd
1 changed files with 14 additions and 3 deletions
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17
src/arch/i386/interface/pcbios/int13.c
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@ -51,7 +51,14 @@ extern void int13_wrapper ( void );
*/
static struct segoff int18_vector;
/** Restart point for INT 18 */
/** Vector for storing original INT 19 handler
*
* We do not chain to this vector, so there is no need to place it in
* .text16.
*/
static struct segoff int19_vector;
/** Restart point for INT 18 or 19 */
extern void int13_exec_fail ( void );
/** List of registered emulated drives */
@ -531,9 +538,11 @@ int int13_boot ( unsigned int drive ) {
return -ENOEXEC;
}
/* Hook INT 18 to capture failure path */
/* Hook INTs 18 and 19 to capture failure paths */
hook_bios_interrupt ( 0x18, ( unsigned int ) int13_exec_fail,
&int18_vector );
hook_bios_interrupt ( 0x19, ( unsigned int ) int13_exec_fail,
&int19_vector );
/* Boot the loaded sector */
REAL_EXEC ( rm_int13_exec,
@ -555,9 +564,11 @@ int int13_boot ( unsigned int drive ) {
DBG ( "Booted disk returned via INT 18\n" );
/* Unhook INT 18 */
/* Unhook INTs 18 and 19 */
unhook_bios_interrupt ( 0x18, ( unsigned int ) int13_exec_fail,
&int18_vector );
unhook_bios_interrupt ( 0x19, ( unsigned int ) int13_exec_fail,
&int19_vector );
return -ECANCELED;
}