[PATCH 1/5] add magicvar command
Sascha Hauer
s.hauer at pengutronix.de
Sun Nov 27 07:09:36 EST 2011
The magicvar command gives an overview about all environment variables
with a special meaning.
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
arch/arm/lib/barebox.lds.S | 4 +++
arch/blackfin/boards/ipe337/barebox.lds.S | 4 +++
arch/mips/lib/barebox.lds.S | 4 +++
arch/nios2/cpu/barebox.lds.S | 4 +++
arch/ppc/boards/pcm030/barebox.lds.S | 4 +++
arch/sandbox/board/barebox.lds.S | 5 ++++
arch/x86/lib/barebox.lds.S | 9 +++++++-
commands/Kconfig | 14 ++++++++++++
commands/Makefile | 1 +
commands/magicvar.c | 20 ++++++++++++++++++
include/asm-generic/barebox.lds.h | 2 +
include/magicvar.h | 32 +++++++++++++++++++++++++++++
12 files changed, 102 insertions(+), 1 deletions(-)
create mode 100644 commands/magicvar.c
create mode 100644 include/magicvar.h
diff --git a/arch/arm/lib/barebox.lds.S b/arch/arm/lib/barebox.lds.S
index 81a9123..f05f345 100644
--- a/arch/arm/lib/barebox.lds.S
+++ b/arch/arm/lib/barebox.lds.S
@@ -80,6 +80,10 @@ SECTIONS
.barebox_cmd : { BAREBOX_CMDS }
__barebox_cmd_end = .;
+ __barebox_magicvar_start = .;
+ .barebox_magicvar : { BAREBOX_MAGICVARS }
+ __barebox_magicvar_end = .;
+
__barebox_initcalls_start = .;
.barebox_initcalls : { INITCALLS }
__barebox_initcalls_end = .;
diff --git a/arch/blackfin/boards/ipe337/barebox.lds.S b/arch/blackfin/boards/ipe337/barebox.lds.S
index 571eeb1..25ca988 100644
--- a/arch/blackfin/boards/ipe337/barebox.lds.S
+++ b/arch/blackfin/boards/ipe337/barebox.lds.S
@@ -71,6 +71,10 @@ SECTIONS
.barebox_cmd : { BAREBOX_CMDS }
___barebox_cmd_end = .;
+ __barebox_magicvar_start = .;
+ .barebox_magicvar : { BAREBOX_MAGICVARS }
+ __barebox_magicvar_end = .;
+
___barebox_initcalls_start = .;
.barebox_initcalls : { INITCALLS }
___barebox_initcalls_end = .;
diff --git a/arch/mips/lib/barebox.lds.S b/arch/mips/lib/barebox.lds.S
index ba4c0af..7746ea0 100644
--- a/arch/mips/lib/barebox.lds.S
+++ b/arch/mips/lib/barebox.lds.S
@@ -56,6 +56,10 @@ SECTIONS
.barebox_cmd : { BAREBOX_CMDS }
__barebox_cmd_end = .;
+ __barebox_magicvar_start = .;
+ .barebox_magicvar : { BAREBOX_MAGICVARS }
+ __barebox_magicvar_end = .;
+
__barebox_initcalls_start = .;
.barebox_initcalls : { INITCALLS }
__barebox_initcalls_end = .;
diff --git a/arch/nios2/cpu/barebox.lds.S b/arch/nios2/cpu/barebox.lds.S
index 2b626fb..934eaf7 100644
--- a/arch/nios2/cpu/barebox.lds.S
+++ b/arch/nios2/cpu/barebox.lds.S
@@ -56,6 +56,10 @@ SECTIONS
.barebox_cmd : { BAREBOX_CMDS }
__barebox_cmd_end = .;
+ __barebox_magicvar_start = .;
+ .barebox_magicvar : { BAREBOX_MAGICVARS }
+ __barebox_magicvar_end = .;
+
__barebox_initcalls_start = .;
.barebox_initcalls : { INITCALLS }
__barebox_initcalls_end = .;
diff --git a/arch/ppc/boards/pcm030/barebox.lds.S b/arch/ppc/boards/pcm030/barebox.lds.S
index 4aacfc5..7dda039 100644
--- a/arch/ppc/boards/pcm030/barebox.lds.S
+++ b/arch/ppc/boards/pcm030/barebox.lds.S
@@ -102,6 +102,10 @@ SECTIONS
.barebox_cmd : { BAREBOX_CMDS }
__barebox_cmd_end = .;
+ __barebox_magicvar_start = .;
+ .barebox_magicvar : { BAREBOX_MAGICVARS }
+ __barebox_magicvar_end = .;
+
__barebox_initcalls_start = .;
.barebox_initcalls : { INITCALLS }
__barebox_initcalls_end = .;
diff --git a/arch/sandbox/board/barebox.lds.S b/arch/sandbox/board/barebox.lds.S
index 76975ee..db5b7de 100644
--- a/arch/sandbox/board/barebox.lds.S
+++ b/arch/sandbox/board/barebox.lds.S
@@ -8,6 +8,11 @@ SECTIONS
__barebox_initcalls_end = .;
. = ALIGN(64);
+ __barebox_magicvar_start = .;
+ .barebox_magicvar : { BAREBOX_MAGICVARS }
+ __barebox_magicvar_end = .;
+
+ . = ALIGN(64);
__barebox_cmd_start = .;
__barebox_cmd : { BAREBOX_CMDS }
__barebox_cmd_end = .;
diff --git a/arch/x86/lib/barebox.lds.S b/arch/x86/lib/barebox.lds.S
index fffc3a5..716cea6 100644
--- a/arch/x86/lib/barebox.lds.S
+++ b/arch/x86/lib/barebox.lds.S
@@ -170,7 +170,14 @@ SECTIONS
. = ALIGN(4);
} > barebox
- .barebox_initcalls : AT ( LOADADDR(.barebox_cmd) + SIZEOF (.barebox_cmd) ) {
+ .barebox_magicvars : AT ( LOADADDR(.barebox_cmd) + SIZEOF (.barebox_cmd) ) {
+ __barebox_magicvar_start = .;
+ .barebox_magicvar : { BAREBOX_MAGICVARS }
+ __barebox_magicvar_end = .;
+ . = ALIGN(4);
+ } > barebox
+
+ .barebox_initcalls : AT ( LOADADDR(.barebox_magicvars) + SIZEOF (.barebox_magicvars) ) {
__barebox_initcalls_start = .;
INITCALLS
__barebox_initcalls_end = .;
diff --git a/commands/Kconfig b/commands/Kconfig
index 18ab840..78b9d2a 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -383,6 +383,20 @@ config CMD_HELP
default y
prompt "help"
+config CMD_MAGICVAR
+ tristate
+ prompt "magicvar"
+ help
+ barebox has some shell variables with special meanings. This
+ command shows the available magic variables.
+
+config CMD_MAGICVAR_HELP
+ bool
+ prompt "display description"
+ depends on CMD_MAGICVAR
+ help
+ Also display a description to the magic variables
+
config CMD_DEVINFO
tristate
default y
diff --git a/commands/Makefile b/commands/Makefile
index 5c51916..9b3a349 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -58,3 +58,4 @@ obj-$(CONFIG_CMD_LED_TRIGGER) += trigger.o
obj-$(CONFIG_CMD_USB) += usb.o
obj-$(CONFIG_CMD_TIME) += time.o
obj-$(CONFIG_CMD_OFTREE) += oftree.o
+obj-$(CONFIG_CMD_MAGICVAR) += magicvar.o
diff --git a/commands/magicvar.c b/commands/magicvar.c
new file mode 100644
index 0000000..31606d2
--- /dev/null
+++ b/commands/magicvar.c
@@ -0,0 +1,20 @@
+#include <common.h>
+#include <command.h>
+#include <magicvar.h>
+
+static int do_magicvar(struct command *cmdtp, int argc, char *argv[])
+{
+ struct magicvar *m;
+
+ for (m = &__barebox_magicvar_start;
+ m != &__barebox_magicvar_end;
+ m++)
+ printf("%-32s %s\n", m->name, m->description);
+
+ return 0;
+}
+
+BAREBOX_CMD_START(magicvar)
+ .cmd = do_magicvar,
+ .usage = "List information about magic variables",
+BAREBOX_CMD_END
diff --git a/include/asm-generic/barebox.lds.h b/include/asm-generic/barebox.lds.h
index 8aee5d2..5467d3a 100644
--- a/include/asm-generic/barebox.lds.h
+++ b/include/asm-generic/barebox.lds.h
@@ -24,3 +24,5 @@
#define BAREBOX_CMDS KEEP(*(SORT_BY_NAME(.barebox_cmd*)))
#define BAREBOX_SYMS KEEP(*(__usymtab))
+
+#define BAREBOX_MAGICVARS KEEP(*(SORT_BY_NAME(.barebox_magicvar*)))
diff --git a/include/magicvar.h b/include/magicvar.h
new file mode 100644
index 0000000..b119a75
--- /dev/null
+++ b/include/magicvar.h
@@ -0,0 +1,32 @@
+#ifndef __MAGIC_VARS_H
+#define __MAGIC_VARS_H
+
+#include <linux/stringify.h>
+
+struct magicvar {
+ const char *name;
+ const char *description;
+};
+
+extern struct magicvar __barebox_magicvar_start;
+extern struct magicvar __barebox_magicvar_end;
+
+#ifdef CONFIG_CMD_MAGICVAR_HELP
+#define MAGICVAR_DESCRIPTION(d) (d)
+#else
+#define MAGICVAR_DESCRIPTION(d) NULL
+#endif
+
+#ifdef CONFIG_CMD_MAGICVAR
+#define BAREBOX_MAGIC_VAR(_name, _description) \
+extern const struct magicvar __barebox_magicvar_##_name; \
+const struct magicvar __barebox_magicvar_##_name \
+ __attribute__ ((unused,section (".barebox_magicvar_" __stringify(_name)))) = { \
+ .name = #_name, \
+ .description = MAGICVAR_DESCRIPTION(_description), \
+};
+#else
+#define BAREBOX_MAGICVAR(_name, _description)
+#endif
+
+#endif /* __MAGIC_VARS_H */
--
1.7.7.1
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