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Add INT 13,41 (extensions installation check). LILO's MBR now uses

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linear calls to load the MS-DOS boot sector in my test setup.
This commit is contained in:
Michael Brown
2006-05-14 23:46:28 +00:00
parent f25731d08f
commit 295e11b2b0
2 changed files with 40 additions and 0 deletions
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24
src/arch/i386/interface/pcbios/int13.c
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@@ -267,6 +267,27 @@ static int int13_get_parameters ( struct int13_drive *drive,
return 0;
}
/**
* INT 13, 41 - Extensions installation check
*
* @v drive Emulated drive
* @v bx 0x55aa
* @ret bx 0xaa55
* @ret cx Extensions API support bitmap
* @ret status Status code
*/
static int int13_extension_check ( struct int13_drive *drive __unused,
struct i386_all_regs *ix86 ) {
if ( ix86->regs.bx == 0x55aa ) {
DBG ( "INT 13 extensions installation check\n" );
ix86->regs.bx = 0xaa55;
ix86->regs.cx = INT13_EXTENSION_LINEAR;
return 0;
} else {
return INT13_STATUS_INVALID;
}
}
/**
* INT 13, 42 - Extended read
*
@@ -357,6 +378,9 @@ static void int13 ( struct i386_all_regs *ix86 ) {
case INT13_GET_PARAMETERS:
status = int13_get_parameters ( drive, ix86 );
break;
case INT13_EXTENSION_CHECK:
status = int13_extension_check ( drive, ix86 );
break;
case INT13_EXTENDED_READ:
status = int13_extended_read ( drive, ix86 );
break;