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Subject[PATCH] /proc/sys/kernel/bootloader_type
This patch exports to userspace the boot loader ID which has been 
exported by (b)zImage boot loaders since boot protocol version 2.

Tested on i386 and x86-64; as far as I know those are the only
architectures which use zImage/bzImage format.

-hpa


Signed-Off-By: H. Peter Anvin <hpa@zytor.com>

Index: linux-2.5/arch/i386/Makefile
===================================================================
RCS file: /home/hpa/kernel/bkcvs/linux-2.5/arch/i386/Makefile,v
retrieving revision 1.73
diff -u -r1.73 Makefile
--- linux-2.5/arch/i386/Makefile 24 Dec 2004 21:09:54 -0000 1.73
+++ linux-2.5/arch/i386/Makefile 28 Dec 2004 04:56:17 -0000
@@ -20,6 +20,10 @@
LDFLAGS_vmlinux :=
CHECKFLAGS += -D__i386__

+# This allows compilation with an x86-64 compiler
+CC_M32 := $(call cc-option,-m32)
+CC += $(CC_M32)
+
CFLAGS += -pipe -msoft-float

# prevent gcc from keeping the stack 16 byte aligned
Index: linux-2.5/arch/i386/kernel/setup.c
===================================================================
RCS file: /home/hpa/kernel/bkcvs/linux-2.5/arch/i386/kernel/setup.c,v
retrieving revision 1.128
diff -u -r1.128 setup.c
--- linux-2.5/arch/i386/kernel/setup.c 27 Dec 2004 18:21:04 -0000 1.128
+++ linux-2.5/arch/i386/kernel/setup.c 29 Dec 2004 22:10:30 -0000
@@ -97,6 +97,9 @@
/* For PCI or other memory-mapped resources */
unsigned long pci_mem_start = 0x10000000;

+/* Boot loader ID as an integer, for the benefit of proc_dointvec */
+int bootloader_type;
+
/* user-defined highmem size */
static unsigned int highmem_pages = -1;

@@ -1338,6 +1341,7 @@
BIOS_revision = SYS_DESC_TABLE.table[2];
}
aux_device_present = AUX_DEVICE_INFO;
+ bootloader_type = LOADER_TYPE;

#ifdef CONFIG_BLK_DEV_RAM
rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
Index: linux-2.5/arch/x86_64/kernel/setup.c
===================================================================
RCS file: /home/hpa/kernel/bkcvs/linux-2.5/arch/x86_64/kernel/setup.c,v
retrieving revision 1.59
diff -u -r1.59 setup.c
--- linux-2.5/arch/x86_64/kernel/setup.c 2 Nov 2004 23:06:28 -0000 1.59
+++ linux-2.5/arch/x86_64/kernel/setup.c 29 Dec 2004 23:46:41 -0000
@@ -78,6 +78,9 @@
/* For PCI or other memory-mapped resources */
unsigned long pci_mem_start = 0x10000000;

+/* Boot loader ID as an integer, for the benefit of proc_dointvec */
+int bootloader_type;
+
unsigned long saved_video_mode;

#ifdef CONFIG_SWIOTLB
@@ -452,6 +455,7 @@
edid_info = EDID_INFO;
aux_device_present = AUX_DEVICE_INFO;
saved_video_mode = SAVED_VIDEO_MODE;
+ bootloader_type = LOADER_TYPE;

#ifdef CONFIG_BLK_DEV_RAM
rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
Index: linux-2.5/include/asm-i386/processor.h
===================================================================
RCS file: /home/hpa/kernel/bkcvs/linux-2.5/include/asm-i386/processor.h,v
retrieving revision 1.78
diff -u -r1.78 processor.h
--- linux-2.5/include/asm-i386/processor.h 27 Dec 2004 18:21:04 -0000 1.78
+++ linux-2.5/include/asm-i386/processor.h 29 Dec 2004 23:45:34 -0000
@@ -283,6 +283,9 @@
extern unsigned int BIOS_revision;
extern unsigned int mca_pentium_flag;

+/* Boot loader type from the setup header */
+extern int bootloader_type;
+
/*
* User space process size: 3GB (default).
*/
Index: linux-2.5/include/asm-x86_64/processor.h
===================================================================
RCS file: /home/hpa/kernel/bkcvs/linux-2.5/include/asm-x86_64/processor.h,v
retrieving revision 1.48
diff -u -r1.48 processor.h
--- linux-2.5/include/asm-x86_64/processor.h 27 Dec 2004 18:21:04 -0000 1.48
+++ linux-2.5/include/asm-x86_64/processor.h 29 Dec 2004 23:45:31 -0000
@@ -456,5 +456,7 @@
#define cache_line_size() (boot_cpu_data.x86_cache_alignment)

extern unsigned long boot_option_idle_override;
+/* Boot loader type from the setup header */
+extern int bootloader_type;

#endif /* __ASM_X86_64_PROCESSOR_H */
Index: linux-2.5/include/linux/sysctl.h
===================================================================
RCS file: /home/hpa/kernel/bkcvs/linux-2.5/include/linux/sysctl.h,v
retrieving revision 1.82
diff -u -r1.82 sysctl.h
--- linux-2.5/include/linux/sysctl.h 20 Oct 2004 15:36:36 -0000 1.82
+++ linux-2.5/include/linux/sysctl.h 29 Dec 2004 22:11:14 -0000
@@ -134,6 +134,7 @@
KERN_SPARC_SCONS_PWROFF=64, /* int: serial console power-off halt */
KERN_HZ_TIMER=65, /* int: hz timer on or off */
KERN_UNKNOWN_NMI_PANIC=66, /* int: unknown nmi panic flag */
+ KERN_BOOTLOADER_TYPE=67, /* int: boot loader type */
};


Index: linux-2.5/kernel/sysctl.c
===================================================================
RCS file: /home/hpa/kernel/bkcvs/linux-2.5/kernel/sysctl.c,v
retrieving revision 1.96
diff -u -r1.96 sysctl.c
--- linux-2.5/kernel/sysctl.c 2 Nov 2004 23:04:07 -0000 1.96
+++ linux-2.5/kernel/sysctl.c 29 Dec 2004 22:10:41 -0000
@@ -624,6 +624,16 @@
.proc_handler = &proc_unknown_nmi_panic,
},
#endif
+#if defined(CONFIG_X86)
+ {
+ .ctl_name = KERN_BOOTLOADER_TYPE,
+ .procname = "bootloader_type",
+ .data = &bootloader_type,
+ .maxlen = sizeof (int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec,
+ },
+#endif
{ .ctl_name = 0 }
};
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