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[comboot] Unhook interrupt vectors after returning from a COMBOOT image

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This commit is contained in:
Michael Brown
2009-02-17 02:03:16 +00:00
parent 14eafc5b8d
commit 7f903f03af
4 changed files with 18 additions and 0 deletions
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1
src/arch/i386/image/com32.c
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@@ -136,6 +136,7 @@ static int com32_exec ( struct image *image ) {
break; break;
} }
unhook_comboot_interrupts();
comboot_force_text_mode(); comboot_force_text_mode();
return 0; return 0;

1
src/arch/i386/image/comboot.c
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@@ -205,6 +205,7 @@ static int comboot_exec ( struct image *image ) {
break; break;
} }
unhook_comboot_interrupts();
comboot_force_text_mode(); comboot_force_text_mode();
return 0; return 0;

1
src/arch/i386/include/comboot.h
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@@ -64,6 +64,7 @@ typedef struct {
} comboot_shuffle_descriptor; } comboot_shuffle_descriptor;
extern void hook_comboot_interrupts ( ); extern void hook_comboot_interrupts ( );
extern void unhook_comboot_interrupts ( );
/* These are not the correct prototypes, but it doens't matter, /* These are not the correct prototypes, but it doens't matter,
* as we only ever get the address of these functions; * as we only ever get the address of these functions;

15
src/arch/i386/interface/syslinux/comboot_call.c
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@@ -616,3 +616,18 @@ void hook_comboot_interrupts ( ) {
hook_bios_interrupt ( 0x22, ( unsigned int ) int22_wrapper, hook_bios_interrupt ( 0x22, ( unsigned int ) int22_wrapper,
&int22_vector ); &int22_vector );
} }
/**
* Unhook BIOS interrupts related to COMBOOT API (INT 20h, 21h, 22h)
*/
void unhook_comboot_interrupts ( ) {
unhook_bios_interrupt ( 0x20, ( unsigned int ) int20_wrapper,
&int20_vector );
unhook_bios_interrupt ( 0x21, ( unsigned int ) int21_wrapper,
&int21_vector );
unhook_bios_interrupt ( 0x22, ( unsigned int ) int22_wrapper,
&int22_vector );
}