diff options
| -rw-r--r-- | src/arch/i386/interface/pcbios/int13con.c | 284 | ||||
| -rw-r--r-- | src/arch/i386/prefix/usbdisk.S | 21 | ||||
| -rw-r--r-- | src/arch/x86/include/bits/errfile.h | 1 | ||||
| -rw-r--r-- | src/config/config.c | 3 | ||||
| -rw-r--r-- | src/config/console.h | 1 |
5 files changed, 304 insertions, 6 deletions
diff --git a/src/arch/i386/interface/pcbios/int13con.c b/src/arch/i386/interface/pcbios/int13con.c new file mode 100644 index 00000000..2414c690 --- /dev/null +++ b/src/arch/i386/interface/pcbios/int13con.c @@ -0,0 +1,284 @@ +/* + * Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + * + * You can also choose to distribute this program under the terms of + * the Unmodified Binary Distribution Licence (as given in the file + * COPYING.UBDL), provided that you have satisfied its requirements. + */ + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + +#include <stdint.h> +#include <string.h> +#include <errno.h> +#include <ipxe/console.h> +#include <ipxe/init.h> +#include <realmode.h> +#include <int13.h> +#include <config/console.h> + +/** @file + * + * INT13 disk log console + * + */ + +/* Set default console usage if applicable */ +#if ! ( defined ( CONSOLE_INT13 ) && CONSOLE_EXPLICIT ( CONSOLE_INT13 ) ) +#undef CONSOLE_INT13 +#define CONSOLE_INT13 ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG ) +#endif + +/** Disk drive number */ +#define INT13CON_DRIVE 0x80 + +/** Log partition type */ +#define INT13CON_PARTITION_TYPE 0xe0 + +/** Maximum number of outstanding unwritten characters */ +#define INT13CON_MAX_UNWRITTEN 64 + +/** Log partition header */ +struct int13con_header { + /** Magic signature */ + char magic[10]; +} __attribute__ (( packed )); + +/** Log partition magic signature */ +#define INT13CON_MAGIC "iPXE LOG\n\n" + +/** Sector buffer */ +static uint8_t __bss16_array ( int13con_buffer, [INT13_BLKSIZE] ); +#define int13con_buffer __use_data16 ( int13con_buffer ) + +/** Disk address packet */ +static struct int13_disk_address __bss16 ( int13con_address ); +#define int13con_address __use_data16 ( int13con_address ) + +/** Current LBA */ +static uint64_t int13con_lba; + +/** Maximum LBA */ +static uint64_t int13con_max_lba; + +/** Current offset within sector */ +static size_t int13con_offset; + +/** Number of unwritten characters */ +static size_t int13con_unwritten; + +struct console_driver int13con __console_driver; + +/** + * Read/write disk sector + * + * @v op Operation + * @v lba Logical block address + * @ret rc Return status code + */ +static int int13con_rw ( unsigned int op, uint64_t lba ) { + 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; + + /* Issue INT13 */ + __asm__ ( REAL_CODE ( "int $0x13\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; +} + +/** + * Write character to console + * + * @v character Character + */ +static void int13con_putchar ( int character ) { + static int busy; + int rc; + + /* Ignore if we are already mid-logging */ + if ( busy ) + return; + busy = 1; + + /* Write character to buffer */ + int13con_buffer[int13con_offset++] = character; + int13con_unwritten++; + + /* Write sector to disk, if applicable */ + if ( ( int13con_offset == INT13_BLKSIZE ) || + ( int13con_unwritten == INT13CON_MAX_UNWRITTEN ) || + ( character == '\n' ) ) { + + /* Write sector to disk */ + if ( ( rc = int13con_rw ( INT13_EXTENDED_WRITE, + int13con_lba ) ) != 0 ) { + DBG ( "INT13CON could not write log\n" ); + /* Ignore and continue; there's nothing we can do */ + } + + /* Reset count of unwritten characters */ + int13con_unwritten = 0; + } + + /* Move to next sector, if applicable */ + if ( int13con_offset == INT13_BLKSIZE ) { + + /* Disable console if we have run out of space */ + if ( int13con_lba >= int13con_max_lba ) + int13con.disabled = 1; + + /* Clear log buffer */ + memset ( int13con_buffer, 0, sizeof ( int13con_buffer ) ); + int13con_offset = 0; + + /* Move to next sector */ + int13con_lba++; + } + + /* Clear busy flag */ + busy = 0; +} + +/** + * Find log partition + * + * @ret rc Return status code + */ +static int int13con_find ( void ) { + struct master_boot_record *mbr = + ( ( struct master_boot_record * ) int13con_buffer ); + struct int13con_header *hdr = + ( ( struct int13con_header * ) 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 != INT13CON_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; + } + + /* Check partition header */ + if ( memcmp ( hdr->magic, INT13CON_MAGIC, + sizeof ( hdr->magic ) ) != 0 ) { + DBG ( "INT13CON partition %d bad magic\n", ( i + 1 ) ); + DBG2_HDA ( 0, hdr, sizeof ( *hdr ) ); + continue; + } + + /* Found log partition */ + DBG ( "INT13CON partition %d at [%08x,%08x)\n", ( i + 1 ), + part[i].start, ( part[i].start + part[i].length ) ); + int13con_lba = part[i].start; + int13con_max_lba = ( part[i].start + part[i].length - 1 ); + + /* Initialise log buffer */ + memset ( &int13con_buffer[ sizeof ( *hdr ) ], 0, + ( sizeof ( int13con_buffer ) - sizeof ( *hdr ) ) ); + int13con_offset = sizeof ( hdr->magic ); + + return 0; + } + + DBG ( "INT13CON found no log partition\n" ); + return -ENOENT; +} + +/** + * Initialise INT13 console + * + */ +static void int13con_init ( void ) { + 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; + } + + /* Locate log partition */ + if ( ( rc = int13con_find() ) != 0) + return; + + /* Enable console */ + int13con.disabled = 0; +} + +/** + * INT13 console initialisation function + */ +struct init_fn int13con_init_fn __init_fn ( INIT_CONSOLE ) = { + .initialise = int13con_init, +}; + +/** INT13 console driver */ +struct console_driver int13con __console_driver = { + .putchar = int13con_putchar, + .disabled = CONSOLE_DISABLED, + .usage = CONSOLE_INT13, +}; diff --git a/src/arch/i386/prefix/usbdisk.S b/src/arch/i386/prefix/usbdisk.S index 8dc30612..9676406e 100644 --- a/src/arch/i386/prefix/usbdisk.S +++ b/src/arch/i386/prefix/usbdisk.S @@ -8,18 +8,27 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ) #include "mbr.S" -/* Partition table: ZIP-compatible partition 4, 64 heads, 32 sectors/track */ +/* Partition table: 64 heads, 32 sectors/track (ZIP-drive compatible) */ .org 446 .space 16 .space 16 - .space 16 - .byte 0x80, 0x01, 0x01, 0x00 - .byte 0xeb, 0x3f, 0x20, 0x01 + /* Partition 3: log partition (for CONSOLE_INT13) */ + .byte 0x00, 0x01, 0x01, 0x00 + .byte 0xe0, 0x3f, 0x20, 0x00 .long 0x00000020 - .long 0x00000fe0 + .long 0x000007e0 + /* Partition 4: boot partition */ + .byte 0x80, 0x00, 0x01, 0x01 + .byte 0xeb, 0x3f, 0x20, 0x02 + .long 0x00000800 + .long 0x00001000 .org 510 .byte 0x55, 0xaa -/* Skip to start of partition */ +/* Skip to start of log partition */ .org 32 * 512 + .ascii "iPXE LOG\n\n" + +/* Skip to start of boot partition */ + .org 2048 * 512 diff --git a/src/arch/x86/include/bits/errfile.h b/src/arch/x86/include/bits/errfile.h index 6afeb73f..d077a450 100644 --- a/src/arch/x86/include/bits/errfile.h +++ b/src/arch/x86/include/bits/errfile.h @@ -21,6 +21,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #define ERRFILE_guestinfo ( ERRFILE_ARCH | ERRFILE_CORE | 0x000a0000 ) #define ERRFILE_apm ( ERRFILE_ARCH | ERRFILE_CORE | 0x000b0000 ) #define ERRFILE_vesafb ( ERRFILE_ARCH | ERRFILE_CORE | 0x000c0000 ) +#define ERRFILE_int13con ( ERRFILE_ARCH | ERRFILE_CORE | 0x000d0000 ) #define ERRFILE_bootsector ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00000000 ) #define ERRFILE_bzimage ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00010000 ) diff --git a/src/config/config.c b/src/config/config.c index ae2ec479..9cc23949 100644 --- a/src/config/config.c +++ b/src/config/config.c @@ -84,6 +84,9 @@ REQUIRE_OBJECT ( debugcon ); #ifdef CONSOLE_VESAFB REQUIRE_OBJECT ( vesafb ); #endif +#ifdef CONSOLE_INT13 +REQUIRE_OBJECT ( int13con ); +#endif /* * Drag in all requested network protocols diff --git a/src/config/console.h b/src/config/console.h index d71ef481..ffa5cf50 100644 --- a/src/config/console.h +++ b/src/config/console.h @@ -23,6 +23,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); //#define CONSOLE_VMWARE /* VMware logfile console */ //#define CONSOLE_DEBUGCON /* Debug port console */ //#define CONSOLE_VESAFB /* VESA framebuffer console */ +//#define CONSOLE_INT13 /* INT13 disk log console */ #define KEYBOARD_MAP us |