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SubjectRe: kernel .config support?
Date
Hello Miles,

> On Mon, Jan 06, 2003 at 08:15:07AM +0100, Paul Rolland wrote:
> > > probability of a feature printing a copyright notice at init
> > > time is inversely proportional to its importance!]
> >
> > This can be removed too, in fact I don't care. I just put
> it because
> > many others are doing so
>
> That's the problem.... :-)
>

Well, here is a new copy of the patch... I've implemented the changes
you requested :
- no more messages at boot time,
- one level /proc entry (/proc/config.gz)
- no more unnecessary version entry.

I've also added a Kconfig dependancy on PROC_FS. Compiling without
PROC_FS support is fine without this dependancy, but result in
nothing being present, which may be puzzling.

Regards,
Paul

diff -urN -S config.c linux-2.5.56/drivers/char/config.c
linux-2.5.56-work/drivers/char/config.c
--- linux-2.5.56/drivers/char/config.c 1970-01-01 01:00:00.000000000
+0100
+++ linux-2.5.56-work/drivers/char/config.c 2003-01-12
15:12:41.000000000 +0100
@@ -0,0 +1,107 @@
+/*
+ * Linux Configuration Driver
+ * (c) 2002-2003 Paul Rolland, rol@as2917.net
+ *
+ * This driver is intended to give access to the .config file that was
+ * used to compile the kernel.
+ * It does include a gzip'd copy of the file, which can be access thru
+ * /proc/config.gz
+ *
+ */
+
+#define DOT_CONFIG_VERSION "1.0"
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/fcntl.h>
+#include <linux/mc146818rtc.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/spinlock.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#ifndef CONFIG_PROC_FS
+static int config_read_proc( char *buffer, char **start, off_t offset,
+ int size, int *eof, void *data)
+{
+ return 0;
+}
+#else
+
+#include "config.h"
+
+/* This macro frees the machine specific function from bounds checking
+and
+ * this like that... */
+#define PRINT_PROC(fmt,args...)
\
+ do { \
+ *len += sprintf( buffer+*len, fmt, ##args ); \
+ if (*begin + *len > offset + size) \
+ return( 0 ); \
+ if (*begin + *len < offset) {
\
+ *begin += *len; \
+ *len = 0; \
+ } \
+ } while(0)
+
+
+static int config_gz_infos(char *buffer, int *len, off_t *begin, off_t
offset,
+ int size)
+{
+ int i;
+
+ for (i=0; i<DOT_CONFIG_GZ_SIZE; i++) {
+ PRINT_PROC("%c", config_gz[i]);
+ }
+
+ return(1);
+}
+
+static int config_gz_read_proc( char *buffer, char **start, off_t
offset,
+ int size, int *eof, void *data ) {
+ int len = 0;
+ off_t begin = 0;
+
+ *eof = config_gz_infos(buffer, &len, &begin, offset, size);
+
+ if (offset >= begin + len)
+ return(0);
+ *start = buffer + (offset - begin);
+ return( size < begin + len - offset ? size : begin + len - offset );
+}
+
+static int __init config_init(void)
+{
+ if
(!create_proc_read_entry("config.gz",0,0,config_gz_read_proc,NULL)) {
+ printk(KERN_ERR "config: can't create /proc/config.gz\n");
+ return(-ENOMEM);
+ }
+
+ return( 0 );
+}
+
+static void __exit config_cleanup_module (void)
+{
+ remove_proc_entry( "config.gz", 0 );
+}
+
+module_init(config_init);
+module_exit(config_cleanup_module);
+
+#endif /* CONFIG_PROC_FS */
+
+MODULE_AUTHOR("Paul Rolland");
+MODULE_DESCRIPTION("Driver for accessing kernel configuration");
+MODULE_LICENSE("GPL");
+
diff -urN -S config.c linux-2.5.56/drivers/char/dotHmaker.c
linux-2.5.56-work/drivers/char/dotHmaker.c
--- linux-2.5.56/drivers/char/dotHmaker.c 1970-01-01
01:00:00.000000000 +0100
+++ linux-2.5.56-work/drivers/char/dotHmaker.c 2003-01-12
15:12:33.000000000 +0100
@@ -0,0 +1,54 @@
+/*
+ * Linux Configuration Driver
+ * (c) 2002-2003 Paul Rolland, rol@as2917.net
+ *
+ * This is a part of the /proc/config.gz module.
+ * this program is used to transform a config.txt.gz file to
+ * a variable that can then be included in config.c
+ *
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+
+int main(void)
+{
+ FILE * in = stdin;
+ int i;
+ unsigned char buf;
+
+ int size = 0;
+
+ printf("/*\n");
+ printf(" * Automagically generated file, please don't edit !\n");
+ printf(" */\n"); printf("\n");
+ printf("static char config_gz[] = \\\n");
+
+ i = 0;
+
+ fread(&buf, sizeof(unsigned char), 1, in);
+ while (!feof(in)) {
+ if (i == 0) {
+ printf(" \"");
+ } /* endif */
+ printf("\\x%x", buf);
+ size ++;
+ i ++;
+ if (i == 10) {
+ i = 0;
+ printf("\"\\\n");
+ } /* endif */
+ fread(&buf, sizeof(unsigned char), 1, in);
+ } /* endwhile */
+
+ if (i == 0) {
+ printf(" ;\n");
+ } else {
+ printf("\";\n");
+ } /* endif */
+ printf("\n");
+ printf("#define DOT_CONFIG_GZ_SIZE %d\n\n", size);
+
+ return(0);
+}
+
--- linux-2.5.56/drivers/char/Kconfig 2003-01-10 21:11:20.000000000
+0100
+++ linux-2.5.56-work/drivers/char/Kconfig 2003-01-12
14:50:40.000000000 +0100
@@ -4,6 +4,16 @@

menu "Character devices"

+config CONFIG
+ bool "Linux Kernel Configuration Driver"
+ depends on PROC_FS
+ ---help---
+ If you say Y here, and if you have /proc support enabled,
you'll find
+ a /proc/config.gz entry that will contain a gzipped copy of
the
+ .config used to generate the running kernel.
+
+ This adds about 4KB to the kernel size.
+
config VT
bool "Virtual terminal"
---help---
diff -urN -S config.c linux-2.5.56/drivers/char/Makefile
linux-2.5.56-work/drivers/char/Makefile
--- linux-2.5.56/drivers/char/Makefile 2003-01-10 21:12:21.000000000
+0100
+++ linux-2.5.56-work/drivers/char/Makefile 2003-01-12
11:30:39.000000000 +0100
@@ -7,6 +7,9 @@
#
FONTMAPFILE = cp437.uni

+EXTRA_TARGETS := config.h
+host-progs := dotHmaker
+
obj-y += mem.o tty_io.o n_tty.o tty_ioctl.o pty.o misc.o random.o

# All of the (potential) objects that export symbols.
@@ -16,6 +19,7 @@
ite_gpio.o keyboard.o misc.o nvram.o random.o
rtc.o \
selection.o sonypi.o sysrq.o tty_io.o
tty_ioctl.o

+obj-$(CONFIG_CONFIG) += config.o
obj-$(CONFIG_VT) += vt_ioctl.o vc_screen.o consolemap.o
consolemap_deftbl.o selection.o keyboard.o
obj-$(CONFIG_HW_CONSOLE) += vt.o defkeymap.o
obj-$(CONFIG_MAGIC_SYSRQ) += sysrq.o
@@ -85,7 +89,7 @@


# Files generated that shall be removed upon make clean
-clean-files := consolemap_deftbl.c defkeymap.c qtronixmap.c
+clean-files := consolemap_deftbl.c defkeymap.c qtronixmap.c dotHmaker
config.txt config.txt.gz config.h

$(obj)/consolemap_deftbl.c: $(src)/$(FONTMAPFILE)
$(call do_cmd,CONMK $@,$(objtree)/scripts/conmakehash $< > $@)
@@ -107,3 +111,13 @@
rm $@.tmp

endif
+
+$(obj)/config.o: $(obj)/config.h
+
+$(obj)/config.h: $(obj)/config.txt.gz $(obj)/dotHmaker
+ $(obj)/dotHmaker < $< > $@
+
+$(obj)/config.txt.gz: .config FORCE
+ cp .config $(obj)/config.txt
+ $(call if_changed,gzip)
+
-
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