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mcb30mcb30
committedNov 12, 2011
[prefix] Allow an initrd to be passed to iPXE
Allow an initrd (such as an embedded script) to be passed to iPXE when loaded as a .lkrn (or .iso) image. This allows an embedded script to be varied without recompiling iPXE. Signed-off-by: Michael Brown <mcb30@ipxe.org>
·
v1.21.1v1.20.1
1 parent 2422647 commit 27fdb95

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4 files changed

+262
-124
lines changed

4 files changed

+262
-124
lines changed
 

‎src/arch/i386/core/cmdline.c

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This file was deleted.

‎src/arch/i386/core/runtime.c

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/*
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* Copyright (C) 2011 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/** @file
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*
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* Command line and initrd passed to iPXE at runtime
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*
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <assert.h>
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#include <ipxe/init.h>
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#include <ipxe/image.h>
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#include <ipxe/script.h>
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#include <ipxe/umalloc.h>
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#include <realmode.h>
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/** Command line physical address
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*
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* This can be set by the prefix.
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*/
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uint32_t __bss16 ( cmdline_phys );
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#define cmdline_phys __use_data16 ( cmdline_phys )
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/** initrd physical address
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*
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* This can be set by the prefix.
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*/
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uint32_t __bss16 ( initrd_phys );
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#define initrd_phys __use_data16 ( initrd_phys )
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/** initrd length
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*
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* This can be set by the prefix.
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*/
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uint32_t __bss16 ( initrd_len );
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#define initrd_len __use_data16 ( initrd_len )
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/** Internal copy of the command line */
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static char *cmdline_copy;
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/** Free command line image */
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static void cmdline_image_free ( struct refcnt *refcnt ) {
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struct image *image = container_of ( refcnt, struct image, refcnt );
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DBGC ( image, "RUNTIME freeing command line\n" );
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free ( cmdline_copy );
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}
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/** Embedded script representing the command line */
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static struct image cmdline_image = {
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.refcnt = REF_INIT ( cmdline_image_free ),
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.name = "<CMDLINE>",
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.type = &script_image_type,
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};
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/** Colour for debug messages */
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#define colour &cmdline_image
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/**
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* Strip unwanted cruft from command line
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*
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* @v cmdline Command line
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* @v cruft Initial substring of cruft to strip
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*/
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static void cmdline_strip ( char *cmdline, const char *cruft ) {
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char *strip;
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char *strip_end;
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/* Find unwanted cruft, if present */
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if ( ! ( strip = strstr ( cmdline, cruft ) ) )
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return;
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/* Strip unwanted cruft */
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strip_end = strchr ( strip, ' ' );
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if ( strip_end ) {
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*strip_end = '\0';
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DBGC ( colour, "RUNTIME stripping \"%s\"\n", strip );
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strcpy ( strip, ( strip_end + 1 ) );
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} else {
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DBGC ( colour, "RUNTIME stripping \"%s\"\n", strip );
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*strip = '\0';
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}
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}
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/**
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* Initialise command line
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*
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* @ret rc Return status code
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*/
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static int cmdline_init ( void ) {
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userptr_t cmdline_user;
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char *cmdline;
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size_t len;
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int rc;
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/* Do nothing if no command line was specified */
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if ( ! cmdline_phys ) {
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DBGC ( colour, "RUNTIME found no command line\n" );
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return 0;
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}
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cmdline_user = phys_to_user ( cmdline_phys );
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len = ( strlen_user ( cmdline_user, 0 ) + 1 /* NUL */ );
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/* Allocate and copy command line */
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cmdline_copy = malloc ( len );
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if ( ! cmdline_copy ) {
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DBGC ( colour, "RUNTIME could not allocate %zd bytes for "
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"command line\n", len );
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rc = -ENOMEM;
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goto err_alloc_cmdline_copy;
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}
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cmdline = cmdline_copy;
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copy_from_user ( cmdline, cmdline_user, 0, len );
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DBGC ( colour, "RUNTIME found command line \"%s\"\n", cmdline );
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/* Strip unwanted cruft from the command line */
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cmdline_strip ( cmdline, "BOOT_IMAGE=" );
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cmdline_strip ( cmdline, "initrd=" );
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while ( isspace ( *cmdline ) )
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cmdline++;
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DBGC ( colour, "RUNTIME using command line \"%s\"\n", cmdline );
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/* Prepare and register image */
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cmdline_image.data = virt_to_user ( cmdline );
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cmdline_image.len = strlen ( cmdline );
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if ( cmdline_image.len ) {
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if ( ( rc = register_image ( &cmdline_image ) ) != 0 ) {
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DBGC ( colour, "RUNTIME could not register command "
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"line: %s\n", strerror ( rc ) );
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goto err_register_image;
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}
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}
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/* Drop our reference to the image */
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image_put ( &cmdline_image );
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return 0;
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err_register_image:
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image_put ( &cmdline_image );
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err_alloc_cmdline_copy:
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return rc;
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}
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/**
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* Initialise initrd
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*
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* @ret rc Return status code
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*/
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static int initrd_init ( void ) {
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struct image *image;
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int rc;
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/* Do nothing if no initrd was specified */
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if ( ! initrd_phys ) {
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DBGC ( colour, "RUNTIME found no initrd\n" );
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return 0;
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}
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if ( ! initrd_len ) {
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DBGC ( colour, "RUNTIME found empty initrd\n" );
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return 0;
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}
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DBGC ( colour, "RUNTIME found initrd at [%x,%x)\n",
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initrd_phys, ( initrd_phys + initrd_len ) );
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/* Allocate image */
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image = alloc_image();
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if ( ! image ) {
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DBGC ( colour, "RUNTIME could not allocate image for "
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"initrd\n" );
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goto err_alloc_image;
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}
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image_set_name ( image, "<INITRD>" );
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/* Allocate and copy initrd content */
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image->data = umalloc ( initrd_len );
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if ( ! image->data ) {
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DBGC ( colour, "RUNTIME could not allocate %zd bytes for "
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"initrd\n", initrd_len );
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goto err_umalloc;
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}
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image->len = initrd_len;
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memcpy_user ( image->data, 0, phys_to_user ( initrd_phys ), 0,
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initrd_len );
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/* Register image */
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if ( ( rc = register_image ( image ) ) != 0 ) {
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DBGC ( colour, "RUNTIME could not register initrd: %s\n",
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strerror ( rc ) );
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goto err_register_image;
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}
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/* Drop our reference to the image */
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image_put ( image );
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return 0;
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err_register_image:
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err_umalloc:
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image_put ( image );
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err_alloc_image:
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return rc;
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}
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/**
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* Initialise command line and initrd
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*
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*/
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static void runtime_init ( void ) {
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int rc;
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/* Initialise command line */
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if ( ( rc = cmdline_init() ) != 0 ) {
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/* No way to report failure */
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return;
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}
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/* Initialise initrd */
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if ( ( rc = initrd_init() ) != 0 ) {
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/* No way to report failure */
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return;
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}
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}
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/** Command line and initrd initialisation function */
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struct init_fn runtime_init_fn __init_fn ( INIT_NORMAL ) = {
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.initialise = runtime_init,
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};

‎src/arch/i386/include/bits/errfile.h

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@@ -15,6 +15,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
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#define ERRFILE_biosint ( ERRFILE_ARCH | ERRFILE_CORE | 0x00040000 )
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#define ERRFILE_int13 ( ERRFILE_ARCH | ERRFILE_CORE | 0x00050000 )
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#define ERRFILE_pxeparent ( ERRFILE_ARCH | ERRFILE_CORE | 0x00060000 )
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#define ERRFILE_runtime ( ERRFILE_ARCH | ERRFILE_CORE | 0x00070000 )
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#define ERRFILE_bootsector ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00000000 )
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#define ERRFILE_bzimage ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00010000 )

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