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Diffstat (limited to 'gpxe/src/arch/i386/image/comboot.c')
-rw-r--r--gpxe/src/arch/i386/image/comboot.c322
1 files changed, 0 insertions, 322 deletions
diff --git a/gpxe/src/arch/i386/image/comboot.c b/gpxe/src/arch/i386/image/comboot.c
deleted file mode 100644
index a00b2b95..00000000
--- a/gpxe/src/arch/i386/image/comboot.c
+++ /dev/null
@@ -1,322 +0,0 @@
-/*
- * Copyright (C) 2008 Daniel Verkamp <daniel@drv.nu>.
- *
- * 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-/**
- * @file
- *
- * SYSLINUX COMBOOT (16-bit) image format
- *
- */
-
-FILE_LICENCE ( GPL2_OR_LATER );
-
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <strings.h>
-#include <errno.h>
-#include <assert.h>
-#include <realmode.h>
-#include <basemem.h>
-#include <comboot.h>
-#include <gpxe/uaccess.h>
-#include <gpxe/image.h>
-#include <gpxe/segment.h>
-#include <gpxe/init.h>
-#include <gpxe/features.h>
-
-FEATURE ( FEATURE_IMAGE, "COMBOOT", DHCP_EB_FEATURE_COMBOOT, 1 );
-
-struct image_type comboot_image_type __image_type ( PROBE_NORMAL );
-
-/**
- * COMBOOT PSP, copied to offset 0 of code segment
- */
-struct comboot_psp {
- /** INT 20 instruction, executed if COMBOOT image returns with RET */
- uint16_t int20;
- /** Segment of first non-free paragraph of memory */
- uint16_t first_non_free_para;
-};
-
-/** Offset in PSP of command line */
-#define COMBOOT_PSP_CMDLINE_OFFSET 0x81
-
-/** Maximum length of command line in PSP
- * (127 bytes minus space and CR) */
-#define COMBOOT_MAX_CMDLINE_LEN 125
-
-
-/**
- * Copy command line to PSP
- *
- * @v image COMBOOT image
- */
-static void comboot_copy_cmdline ( struct image * image, userptr_t seg_userptr ) {
- const char *cmdline = ( image->cmdline ? image->cmdline : "" );
- int cmdline_len = strlen ( cmdline );
- if( cmdline_len > COMBOOT_MAX_CMDLINE_LEN )
- cmdline_len = COMBOOT_MAX_CMDLINE_LEN;
- uint8_t len_byte = cmdline_len;
- char spc = ' ', cr = '\r';
-
- /* Copy length to byte before command line */
- copy_to_user ( seg_userptr, COMBOOT_PSP_CMDLINE_OFFSET - 1,
- &len_byte, 1 );
-
- /* Command line starts with space */
- copy_to_user ( seg_userptr,
- COMBOOT_PSP_CMDLINE_OFFSET,
- &spc, 1 );
-
- /* Copy command line */
- copy_to_user ( seg_userptr,
- COMBOOT_PSP_CMDLINE_OFFSET + 1,
- cmdline, cmdline_len );
-
- /* Command line ends with CR */
- copy_to_user ( seg_userptr,
- COMBOOT_PSP_CMDLINE_OFFSET + cmdline_len + 1,
- &cr, 1 );
-}
-
-/**
- * Initialize PSP
- *
- * @v image COMBOOT image
- * @v seg_userptr segment to initialize
- */
-static void comboot_init_psp ( struct image * image, userptr_t seg_userptr ) {
- struct comboot_psp psp;
-
- /* Fill PSP */
-
- /* INT 20h instruction, byte order reversed */
- psp.int20 = 0x20CD;
-
- /* get_fbms() returns BIOS free base memory counter, which is in
- * kilobytes; x * 1024 / 16 == x * 64 == x << 6 */
- psp.first_non_free_para = get_fbms() << 6;
-
- DBGC ( image, "COMBOOT %p: first non-free paragraph = 0x%x\n",
- image, psp.first_non_free_para );
-
- /* Copy the PSP to offset 0 of segment.
- * The rest of the PSP was already zeroed by
- * comboot_prepare_segment. */
- copy_to_user ( seg_userptr, 0, &psp, sizeof( psp ) );
-
- /* Copy the command line to the PSP */
- comboot_copy_cmdline ( image, seg_userptr );
-}
-
-/**
- * Execute COMBOOT image
- *
- * @v image COMBOOT image
- * @ret rc Return status code
- */
-static int comboot_exec ( struct image *image ) {
- userptr_t seg_userptr = real_to_user ( COMBOOT_PSP_SEG, 0 );
- int state;
-
- state = rmsetjmp ( comboot_return );
-
- switch ( state ) {
- case 0: /* First time through; invoke COMBOOT program */
-
- /* Initialize PSP */
- comboot_init_psp ( image, seg_userptr );
-
- /* Hook COMBOOT API interrupts */
- hook_comboot_interrupts();
-
- DBGC ( image, "executing 16-bit COMBOOT image at %4x:0100\n",
- COMBOOT_PSP_SEG );
-
- /* Unregister image, so that a "boot" command doesn't
- * throw us into an execution loop. We never
- * reregister ourselves; COMBOOT images expect to be
- * removed on exit.
- */
- unregister_image ( image );
-
- /* Store stack segment at 0x38 and stack pointer at 0x3A
- * in the PSP and jump to the image */
- __asm__ __volatile__ (
- REAL_CODE ( /* Save return address with segment on old stack */
- "popw %%ax\n\t"
- "pushw %%cs\n\t"
- "pushw %%ax\n\t"
- /* Set DS=ES=segment with image */
- "movw %w0, %%ds\n\t"
- "movw %w0, %%es\n\t"
- /* Set SS:SP to new stack (end of image segment) */
- "movw %w0, %%ss\n\t"
- "xor %%sp, %%sp\n\t"
- "pushw $0\n\t"
- "pushw %w0\n\t"
- "pushw $0x100\n\t"
- /* Zero registers (some COM files assume GP regs are 0) */
- "xorw %%ax, %%ax\n\t"
- "xorw %%bx, %%bx\n\t"
- "xorw %%cx, %%cx\n\t"
- "xorw %%dx, %%dx\n\t"
- "xorw %%si, %%si\n\t"
- "xorw %%di, %%di\n\t"
- "xorw %%bp, %%bp\n\t"
- "lret\n\t" )
- : : "r" ( COMBOOT_PSP_SEG ) : "eax" );
- DBGC ( image, "COMBOOT %p: returned\n", image );
- break;
-
- case COMBOOT_EXIT:
- DBGC ( image, "COMBOOT %p: exited\n", image );
- break;
-
- case COMBOOT_EXIT_RUN_KERNEL:
- DBGC ( image, "COMBOOT %p: exited to run kernel %p\n",
- image, comboot_replacement_image );
- image->replacement = comboot_replacement_image;
- comboot_replacement_image = NULL;
- image_autoload ( image->replacement );
- break;
-
- case COMBOOT_EXIT_COMMAND:
- DBGC ( image, "COMBOOT %p: exited after executing command\n",
- image );
- break;
-
- default:
- assert ( 0 );
- break;
- }
-
- unhook_comboot_interrupts();
- comboot_force_text_mode();
-
- return 0;
-}
-
-/**
- * Check image name extension
- *
- * @v image COMBOOT image
- * @ret rc Return status code
- */
-static int comboot_identify ( struct image *image ) {
- const char *ext;
-
- ext = strrchr( image->name, '.' );
-
- if ( ! ext ) {
- DBGC ( image, "COMBOOT %p: no extension\n",
- image );
- return -ENOEXEC;
- }
-
- ++ext;
-
- if ( strcasecmp( ext, "com" ) && strcasecmp( ext, "cbt" ) ) {
- DBGC ( image, "COMBOOT %p: unrecognized extension %s\n",
- image, ext );
- return -ENOEXEC;
- }
-
- return 0;
-}
-
-/**
- * Load COMBOOT image into memory, preparing a segment and returning it
- * @v image COMBOOT image
- * @ret rc Return status code
- */
-static int comboot_prepare_segment ( struct image *image )
-{
- userptr_t seg_userptr;
- size_t filesz, memsz;
- int rc;
-
- /* Load image in segment */
- seg_userptr = real_to_user ( COMBOOT_PSP_SEG, 0 );
-
- /* Allow etra 0x100 bytes before image for PSP */
- filesz = image->len + 0x100;
-
- /* Ensure the entire 64k segment is free */
- memsz = 0xFFFF;
-
- /* Prepare, verify, and load the real-mode segment */
- if ( ( rc = prep_segment ( seg_userptr, filesz, memsz ) ) != 0 ) {
- DBGC ( image, "COMBOOT %p: could not prepare segment: %s\n",
- image, strerror ( rc ) );
- return rc;
- }
-
- /* Zero PSP */
- memset_user ( seg_userptr, 0, 0, 0x100 );
-
- /* Copy image to segment:0100 */
- memcpy_user ( seg_userptr, 0x100, image->data, 0, image->len );
-
- return 0;
-}
-
-/**
- * Load COMBOOT image into memory
- *
- * @v image COMBOOT image
- * @ret rc Return status code
- */
-static int comboot_load ( struct image *image ) {
- int rc;
-
- DBGC ( image, "COMBOOT %p: name '%s'\n",
- image, image->name );
-
- /* Check if this is a COMBOOT image */
- if ( ( rc = comboot_identify ( image ) ) != 0 ) {
-
- return rc;
- }
-
- /* This is a 16-bit COMBOOT image, valid or otherwise */
- if ( ! image->type )
- image->type = &comboot_image_type;
-
- /* Sanity check for filesize */
- if( image->len >= 0xFF00 ) {
- DBGC( image, "COMBOOT %p: image too large\n",
- image );
- return -ENOEXEC;
- }
-
- /* Prepare segment and load image */
- if ( ( rc = comboot_prepare_segment ( image ) ) != 0 ) {
- return rc;
- }
-
- return 0;
-}
-
-/** SYSLINUX COMBOOT (16-bit) image type */
-struct image_type comboot_image_type __image_type ( PROBE_NORMAL ) = {
- .name = "COMBOOT",
- .load = comboot_load,
- .exec = comboot_exec,
-};
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