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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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16
src/arch/i386/include/int13.h
View File

@ -27,6 +27,8 @@ struct block_device;
#define INT13_WRITE_SECTORS 0x03
/** Get drive parameters */
#define INT13_GET_PARAMETERS 0x08
/** Extensions installation check */
#define INT13_EXTENSION_CHECK 0x41
/** Extended read */
#define INT13_EXTENDED_READ 0x42
/** Extended write */
@ -151,6 +153,20 @@ struct int13_disk_parameters {
/** @} */
/**
* @defgroup int13exts INT 13 extension flags
* @{
*/
/** Extended disk access functions supported */
#define INT13_EXTENSION_LINEAR 0x01
/** Removable drive functions supported */
#define INT13_EXTENSION_REMOVABLE 0x02
/** EDD functions supported */
#define INT13_EXTENSION_EDD 0x04
/** @} */
extern void register_int13_drive ( struct int13_drive *drive );
extern void unregister_int13_drive ( struct int13_drive *drive );
extern int int13_boot ( unsigned int drive );

24
src/arch/i386/interface/pcbios/int13.c
View File

@ -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;