I stole a patch that Arjan did a while ago, and ported it up to 2.5:
http://www.kernelnewbies.org/kernels/rh80/SOURCES/linux-2.4.0-e820.patch
We need this so avoid making BIOS calls when using kexec.
-- Dave Hansen haveblue@us.ibm.com
diff -Nru a/arch/i386/Kconfig b/arch/i386/Kconfig --- a/arch/i386/Kconfig Wed Nov 20 17:47:54 2002 +++ b/arch/i386/Kconfig Wed Nov 20 17:47:54 2002 @@ -636,6 +636,11 @@ with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to /dev/cpu/31/cpuid. +config E820_PROC + bool 'E820 proc support' + help + This exports the BIOS memory map. It is used by kexec + config EDD tristate "BIOS Enhanced Disk Drive calls determine boot disk (EXPERIMENTAL)" depends on EXPERIMENTAL diff -Nru a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile --- a/arch/i386/kernel/Makefile Wed Nov 20 17:47:54 2002 +++ b/arch/i386/kernel/Makefile Wed Nov 20 17:47:54 2002 @@ -14,6 +14,7 @@ obj-y += timers/ obj-$(CONFIG_X86_BIOS_REBOOT) += reboot.o obj-$(CONFIG_MCA) += mca.o +obj-$(CONFIG_E820_PROC) += e820.o obj-$(CONFIG_X86_MSR) += msr.o obj-$(CONFIG_X86_CPUID) += cpuid.o obj-$(CONFIG_MICROCODE) += microcode.o diff -Nru a/arch/i386/kernel/e820.c b/arch/i386/kernel/e820.c --- /dev/null Wed Dec 31 16:00:00 1969 +++ b/arch/i386/kernel/e820.c Wed Nov 20 17:47:54 2002 @@ -0,0 +1,75 @@ +/* Copyright (c) 2001 Red Hat, Inc. All rights reserved. + * This software may be freely redistributed under the terms of the + * GNU General Public License. + * 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. + * + * Author: Arjan van de Ven <arjanv@redhat.com + */ +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/init.h> /* for module_init/exit */ +#include <linux/proc_fs.h> +#include <linux/module.h> +#include <linux/version.h> +#include <linux/types.h> + +#include <asm/e820.h> + +extern struct e820map e820; +struct proc_dir_entry *e820_proc_entry; + +static int e820_proc_output(char *buffer, int bufsize) +{ + int i,bufpos=0; + + for (i = 0; i < e820.nr_map; i++) { + /* FIXME: check for overflow */ + bufpos += sprintf(buffer+bufpos,"%016Lx @ %016Lx ", + e820.map[i].size, e820.map[i].addr); + bufpos += sprintf(buffer+bufpos," %lu\n", e820.map[i].type); + } + return bufpos; +} + + + + + + +static int e820_read_proc(char *page, char **start, off_t off, + int count, int *eof, void *data) +{ + int len = e820_proc_output (page,4096); + if (len <= off+count) *eof = 1; + *start = page + off; + len -= off; + if (len>count) len = count; + if (len<0) len = 0; + return len; +} + +int e820_module_init(void) +{ + /* /proc/e820info probably isn't the best place for it, need + to find a better one */ + e820_proc_entry = create_proc_entry ("e820info", 0, NULL); + if (e820_proc_entry==NULL) + return -EIO; + + e820_proc_entry->read_proc = e820_read_proc; + e820_proc_entry->owner = THIS_MODULE; + + return 0; +} + + +void e820_module_exit(void) +{ + remove_proc_entry ("e820info", e820_proc_entry); +} + +module_init(e820_module_init); +module_exit(e820_module_exit); +
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This archive was generated by hypermail 2b29 : Sat Nov 23 2002 - 22:00:35 EST