int13con.c File Reference

INT13 disk log console. More...

#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <ipxe/console.h>
#include <ipxe/disklog.h>
#include <ipxe/init.h>
#include <realmode.h>
#include <int13.h>
#include <config/console.h>

Go to the source code of this file.

Macros
#define	CONSOLE_INT13   ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG )
#define	INT13CON_DRIVE   0x80
	Disk drive number.
#define	int13con_vector   __use_data16 ( int13con_vector )
#define	int13con_buffer   __use_data16 ( int13con_buffer )
#define	int13con_address   __use_data16 ( int13con_address )

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static struct segoff	__bss16 (int13con_vector)
	Original INT13 vector.
static uint8_t	__bss16_array (int13con_buffer, [INT13_BLKSIZE])
	Sector buffer.
static struct int13_disk_address	__bss16 (int13con_address)
	Disk address packet.
static int	int13con_rw (unsigned int op, uint64_t lba)
	Read/write disk sector.
static int	int13con_write (void)
	Write current logical block.
static void	int13con_putchar (int character)
	Write character to console.
static int	int13con_find (void)
	Find log partition.
static void	int13con_init (void)
	Initialise INT13 console.
struct init_fn int13con_init_fn	__init_fn (INIT_CONSOLE)
	INT13 console initialisation function.
	__asm__ (".globl ipxe_oem_info_disklog\n\t" ".equ ipxe_oem_info_disklog, 0x0001\n\t")

Variables
static struct disklog	int13con_disklog
	Disk log.
struct console_driver int13con	__console_driver
	INT13 console driver.
static struct disklog_operations	int13con_op
	INT13 disk log operations.

Detailed Description

INT13 disk log console.

Definition in file int13con.c.

Macro Definition Documentation

CONSOLE_INT13

#define CONSOLE_INT13   ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG )

Definition at line 51 of file int13con.c.

INT13CON_DRIVE

#define INT13CON_DRIVE   0x80

Disk drive number.

Definition at line 55 of file int13con.c.

Referenced by int13con_init(), and int13con_rw().

int13con_vector

#define int13con_vector   __use_data16 ( int13con_vector )

Definition at line 59 of file int13con.c.

Referenced by __bss16(), and int13con_init().

int13con_buffer

#define int13con_buffer   __use_data16 ( int13con_buffer )

Definition at line 63 of file int13con.c.

Referenced by __bss16_array(), int13con_find(), and int13con_rw().

int13con_address

#define int13con_address   __use_data16 ( int13con_address )

Definition at line 67 of file int13con.c.

Referenced by __bss16(), and int13con_rw().

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

__bss16() [1/2]

struct segoff __bss16 ( int13con_vector )

static

Original INT13 vector.

References __bss16, and int13con_vector.

__bss16_array()

uint8_t __bss16_array ( int13con_buffer )

static

Sector buffer.

References INT13_BLKSIZE, and int13con_buffer.

__bss16() [2/2]

struct int13_disk_address __bss16 ( int13con_address )

static

Disk address packet.

References __bss16, and int13con_address.

int13con_rw()

int int13con_rw ( unsigned int op, uint64_t lba )

static

Read/write disk sector.

Parameters

op	Operation
lba	Logical block address

Return values

rc	Return status code

Definition at line 81 of file int13con.c.

                                                         {
        uint8_t error;
 
        /* Construct disk address packet */
        int13con_address.bufsize = sizeof ( int13con_address );
        int13con_address.count = 1;
        int13con_address.buffer.segment = rm_ds;
        int13con_address.buffer.offset = __from_data16 ( int13con_buffer );
        int13con_address.lba = lba;
 
        /* Emulate INT13 via original vector.  We do this since iPXE
         * (or another subsequent bootloader) may hook INT13 and remap
         * drive numbers.
         */
        __asm__ ( REAL_CODE ( "pushfw\n\t"
                              "cli\n\t"
                              "lcall *int13con_vector\n\t" )
                  : "=a" ( error )
                  : "0" ( op << 8 ), "d" ( INT13CON_DRIVE ),
                    "S" ( __from_data16 ( &int13con_address ) ) );
        if ( error ) {
                DBG ( "INT13CON operation %04x failed: %02x\n",
                      op, error );
                return -EIO;
        }
 
        return 0;
}

References __asm__(), __from_data16, DBG, EIO, error, int13con_address, int13con_buffer, INT13CON_DRIVE, lba, op, REAL_CODE, and rm_ds.

Referenced by int13con_find(), and int13con_write().

int13con_write()

int int13con_write ( void )

static

Write current logical block.

Return values

rc	Return status code

Definition at line 115 of file int13con.c.

                                   {
 
        /* Write block */
        return int13con_rw ( INT13_EXTENDED_WRITE, int13con_disklog.lba );
}

References INT13_EXTENDED_WRITE, int13con_disklog, and int13con_rw().

int13con_putchar()

void int13con_putchar ( int character )

static

Write character to console.

Parameters

character

Character

Definition at line 131 of file int13con.c.

                                               {
 
        /* Write character */
        disklog_putchar ( &int13con_disklog, character );
}

References disklog_putchar(), and int13con_disklog.

int13con_find()

int int13con_find ( void )

static

Find log partition.

Return values

rc	Return status code

Definition at line 142 of file int13con.c.

                                  {
        struct master_boot_record *mbr =
                ( ( struct master_boot_record * ) int13con_buffer );
        struct partition_table_entry part[4];
        unsigned int i;
        int rc;
 
        /* Read MBR */
        if ( ( rc = int13con_rw ( INT13_EXTENDED_READ, 0 ) ) != 0 ) {
                DBG ( "INT13CON could not read MBR: %s\n", strerror ( rc ) );
                return rc;
        }
 
        /* Check MBR magic */
        if ( mbr->magic != INT13_MBR_MAGIC ) {
                DBG ( "INT13CON incorrect MBR magic\n" );
                DBG2_HDA ( 0, mbr, sizeof ( *mbr ) );
                return -EINVAL;
        }
 
        /* Look for magic partition */
        memcpy ( part, mbr->partitions, sizeof ( part ) );
        for ( i = 0 ; i < ( sizeof ( part ) / sizeof ( part[0] ) ) ; i++ ) {
 
                /* Skip partitions of the wrong type */
                if ( part[i].type != DISKLOG_PARTITION_TYPE )
                        continue;
 
                /* Read partition header */
                if ( ( rc = int13con_rw ( INT13_EXTENDED_READ,
                                          part[i].start ) ) != 0 ) {
                        DBG ( "INT13CON partition %d could not read header: "
                              "%s\n", ( i + 1 ), strerror ( rc ) );
                        continue;
                }
 
                /* Initialise disk log console */
                disklog_init ( &int13con_disklog, &int13con_op, &int13con,
                               int13con_buffer, INT13_BLKSIZE, part[i].start,
                               ( part[i].start + part[i].length - 1 ) );
 
                /* Open disk log console */
                if ( ( rc = disklog_open ( &int13con_disklog ) ) != 0 ) {
                        DBG ( "INT13CON partition %d could not initialise: "
                              "%s\n", ( i + 1 ), strerror ( rc ) );
                        continue;
                }
 
                /* Found log partition */
                DBG ( "INT13CON partition %d at [%08llx,%08llx)\n", ( i + 1 ),
                      ( ( unsigned long long ) int13con_disklog.lba ),
                      ( ( unsigned long long ) int13con_disklog.max_lba ) );
 
                return 0;
        }
 
        DBG ( "INT13CON found no log partition\n" );
        return -ENOENT;
}

References DBG, DBG2_HDA, disklog_init(), disklog_open(), DISKLOG_PARTITION_TYPE, EINVAL, ENOENT, INT13_BLKSIZE, INT13_EXTENDED_READ, INT13_MBR_MAGIC, int13con_buffer, int13con_disklog, int13con_op, int13con_rw(), length, master_boot_record::magic, memcpy(), master_boot_record::partitions, rc, start, strerror(), and type.

Referenced by int13con_init().

int13con_init()

void int13con_init ( void )

static

Initialise INT13 console.

Definition at line 206 of file int13con.c.

                                   {
        uint8_t error;
        uint16_t check;
        unsigned int discard_c;
        unsigned int discard_d;
        int rc;
 
        /* Check for INT13 extensions */
        __asm__ __volatile__ ( REAL_CODE ( "int $0x13\n\t"
                                           "setc %%al\n\t" )
                               : "=a" ( error ), "=b" ( check ),
                                 "=c" ( discard_c ), "=d" ( discard_d )
                               : "0" ( INT13_EXTENSION_CHECK << 8 ),
                                 "1" ( 0x55aa ), "3" ( INT13CON_DRIVE ) );
        if ( error || ( check != 0xaa55 ) ) {
                DBG ( "INT13CON missing extensions (%02x,%04x)\n",
                      error, check );
                return;
        }
 
        /* Store original INT13 vector */
        copy_from_real ( &int13con_vector, 0, ( 0x13 * 4 ),
                         sizeof ( int13con_vector ) );
        DBG ( "INT13CON using original INT13 vector %04x:%04x\n",
              int13con_vector.segment, int13con_vector.offset );
 
        /* Locate log partition */
        if ( ( rc = int13con_find() ) != 0)
                return;
 
        /* Enable console */
        int13con.disabled = 0;
}

References __asm__(), __volatile__(), copy_from_real, DBG, discard_c, error, INT13_EXTENSION_CHECK, INT13CON_DRIVE, int13con_find(), int13con_vector, rc, and REAL_CODE.

Referenced by __init_fn().

__init_fn()

struct init_fn int13con_init_fn __init_fn

(

INIT_CONSOLE

)

INT13 console initialisation function.

References __init_fn, INIT_CONSOLE, and int13con_init().

__asm__()

__asm__	(	".globl ipxe_oem_info_disklog\n\t" ".equ	ipxe_oem_info_disklog,
		0x0001\n\t"	)

Referenced by int13con_rw().

Variable Documentation

int13con_disklog

struct disklog int13con_disklog

static

Disk log.

Definition at line 70 of file int13con.c.

Referenced by int13con_find(), int13con_putchar(), and int13con_write().

__console_driver

struct console_driver int13con __console_driver

Initial value:

                    = {
        .putchar = int13con_putchar,
        .disabled = CONSOLE_DISABLED,
        .usage = CONSOLE_INT13,
}

INT13 console driver.

Definition at line 72 of file int13con.c.

int13con_op

struct disklog_operations int13con_op

static

Initial value:

                               = {
        .write = int13con_write,
}

INT13 disk log operations.

Definition at line 122 of file int13con.c.

                                             {
        .write = int13con_write,
};

Referenced by int13con_find().