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Added remaining bus functions.

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This commit is contained in:
Michael Brown 2005-04-18 18:54:27 +00:00
parent 7af89ccf33
commit e3bb65c17f
1 changed files with 121 additions and 12 deletions
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133
src/arch/i386/drivers/bus/bios_disks.c
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@ -1,18 +1,25 @@
#include "realmode.h"
#include "isa_ids.h"
#include "bios_disks.h"
#define CF ( 1 << 0 )
#define BIOS_DISK_NONE 0
struct disk_sector {
char data[512];
};
/*
* Ensure that there is sufficient space in the shared dev_bus
* structure for a struct bios_disk_device.
*
*/
DEV_BUS( struct bios_disk_device, bios_disk_dev );
static char bios_disk_magic[0]; /* guaranteed unique symbol */
/*
* Reset the disk system using INT 13,0. Forces both hard disks and
* floppy disks to seek back to track 0.
*
*/
static void disk_init ( void ) {
REAL_EXEC ( rm_disk_init,
void bios_disk_init ( void ) {
REAL_EXEC ( rm_bios_disk_init,
"sti\n\t"
"xorw %%ax,%%ax\n\t"
"movb $0x80,%%dl\n\t"
@ -28,16 +35,19 @@ static void disk_init ( void ) {
/*
* Read a single sector from a disk using INT 13,2.
*
* Returns the BIOS status code (%ah) - 0 indicates success
* Returns the BIOS status code (%ah) - 0 indicates success.
*
*/
static unsigned int pcbios_disk_read ( int drive, int cylinder, int head,
int sector, struct disk_sector *buf ) {
unsigned int bios_disk_read_once ( struct bios_disk_device *bios_disk,
unsigned int cylinder,
unsigned int head,
unsigned int sector,
struct bios_disk_sector *buf ) {
uint16_t basemem_buf, status, flags;
int discard_c, discard_d;
basemem_buf = BASEMEM_PARAMETER_INIT ( *buf );
REAL_EXEC ( rm_pcbios_disk_read,
REAL_EXEC ( rm_bios_disk_read,
"sti\n\t"
"movw $0x0201, %%ax\n\t" /* Read a single sector */
"int $0x13\n\t"
@ -46,14 +56,113 @@ static unsigned int pcbios_disk_read ( int drive, int cylinder, int head,
"cli\n\t",
4,
OUT_CONSTRAINTS ( "=a" ( status ), "=b" ( flags ),
"=c" ( discard_c ), "=d" ( discard_d ) ),
"=c" ( discard_c ),
"=d" ( discard_d ) ),
IN_CONSTRAINTS ( "c" ( ( ( cylinder & 0xff ) << 8 ) |
( ( cylinder >> 8 ) & 0x3 ) |
sector ),
"d" ( ( head << 8 ) | drive ),
"d" ( ( head << 8 ) | bios_disk->drive ),
"b" ( basemem_buf ) ),
CLOBBER ( "ebp", "esi", "edi" ) );
BASEMEM_PARAMETER_DONE ( *buf );
return ( flags & CF ) ? ( status >> 8 ) : 0;
return ( flags & CF ) ? ( status >> 8 ) : 0;
}
/*
* Fill in parameters for a BIOS disk device based on drive number
*
*/
static int fill_bios_disk_device ( struct bios_disk_device *bios_disk ) {
uint16_t type, flags;
REAL_EXEC ( rm_bios_disk_exists,
"sti\n\t"
"movb $0x15, %%ah\n\t"
"int $0x13\n\t"
"pushfw\n\t"
"popw %%dx\n\t"
"cli\n\t",
2,
OUT_CONSTRAINTS ( "=a" ( type ), "=d" ( flags ) ),
IN_CONSTRAINTS ( "d" ( bios_disk->drive ) ),
CLOBBER ( "ebx", "ecx", "esi", "edi", "ebp" ) );
if ( ( flags & CF ) ||
( ( type >> 8 ) == BIOS_DISK_NONE ) )
return 0;
DBG ( "BIOS disk found valid drive %hhx\n", bios_disk->drive );
return 1;
}
/*
* Find a BIOS disk device matching the specified driver
*
*/
int find_bios_disk_device ( struct bios_disk_device *bios_disk,
struct bios_disk_driver *driver ) {
/* Initialise struct bios_disk if it's the first time it's been used.
*/
if ( bios_disk->magic != bios_disk_magic ) {
memset ( bios_disk, 0, sizeof ( *bios_disk ) );
bios_disk->magic = bios_disk_magic;
}
/* Iterate through all possible BIOS drives, starting where we
* left off
*/
DBG ( "BIOS disk searching for device matching driver %s\n",
driver->name );
do {
/* If we've already used this device, skip it */
if ( bios_disk->already_tried ) {
bios_disk->already_tried = 0;
continue;
}
/* Fill in device parameters */
if ( ! fill_bios_disk_device ( bios_disk ) ) {
continue;
}
/* Compare against driver's valid ID range */
if ( ( bios_disk->drive >= driver->min_drive ) &&
( bios_disk->drive <= driver->max_drive ) ) {
driver->fill_drive_name ( bios_disk->drive,
bios_disk->name );
DBG ( "BIOS_DISK found drive %hhx (\"%s\") "
"matching driver %s\n",
bios_disk->drive, bios_disk->name,
driver->name );
bios_disk->already_tried = 1;
return 1;
}
} while ( ++bios_disk->drive );
/* No device found */
DBG ( "BIOS disk found no device matching driver %s\n", driver->name );
return 0;
}
/*
* Find the next MCA device that can be used to boot using the
* specified driver.
*
*/
int find_bios_disk_boot_device ( struct dev *dev,
struct bios_disk_driver *driver ) {
struct bios_disk_device *bios_disk
= ( struct bios_disk_device * ) dev->bus;
if ( ! find_bios_disk_device ( bios_disk, driver ) )
return 0;
dev->name = bios_disk->name;
dev->devid.bus_type = ISA_BUS_TYPE;
dev->devid.vendor_id = ISA_VENDOR ( 'D', 'S', 'K' );
dev->devid.device_id = bios_disk->drive;
return 1;
}