Make getenv() work before relocation.

So far, getenv() would work before relocation is most cases, even
though it was not intended to be used that way.  When switching to a
hash table based implementation, this would break a number of boards.

For convenience, we make getenv() check if it's running before
relocation and, if so, use getenv_f() internally.

Note that this is limited to simple cases, as we use a small static
buffer (32 bytes) in the global data for this purpose.

For this reason, it is also not a good idea to convert all current
uses of getenv_f() into getenv() - some of the existing use cases need
to be able to deal with longer variable values, so getenv_f() is still
needed and recommended for use before relocation.

Signed-off-by: Wolfgang Denk <wd@denx.de>

11 files changed, 33 insertions, 28 deletions

diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h
index 02cfe45..bd3c3ea 100644
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2002
+ * (C) Copyright 2002-2010
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * See file CREDITS for list of people who contributed to this
@@ -47,13 +47,8 @@ typedef	struct	global_data {
 #ifdef CONFIG_FSL_ESDHC
 	unsigned long	sdhc_clk;
 #endif
-#if 0
-	unsigned long	cpu_clk;	/* CPU clock in Hz!		*/
-	unsigned long	bus_clk;
-	phys_size_t	ram_size;	/* RAM size */
-	unsigned long	reset_status;	/* reset status register at boot */
-#endif
 	void		**jt;		/* jump table */
+	char		env_buf[32];	/* buffer for getenv() before reloc. */
 } gd_t;
 
 /*
@@ -65,7 +60,7 @@ typedef	struct	global_data {
 #define	GD_FLG_POSTFAIL	0x00008		/* Critical POST test failed		*/
 #define	GD_FLG_POSTSTOP	0x00010		/* POST seqeunce aborted		*/
 #define	GD_FLG_LOGINIT	0x00020		/* Log Buffer has been initialized	*/
-#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)		*/
 
 #define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("r8")
 
diff --git a/arch/avr32/include/asm/global_data.h b/arch/avr32/include/asm/global_data.h
index efbdda9..521a6a2 100644
--- a/arch/avr32/include/asm/global_data.h
+++ b/arch/avr32/include/asm/global_data.h
@@ -46,6 +46,7 @@ typedef	struct	global_data {
 	void		*fb_base;	/* framebuffer address */
 #endif
 	void		**jt;		/* jump table */
+	char		env_buf[32];	/* buffer for getenv() before reloc. */
 } gd_t;
 
 /*
@@ -57,7 +58,7 @@ typedef	struct	global_data {
 #define GD_FLG_POSTFAIL	0x00008		/* Critical POST test failed	 */
 #define GD_FLG_POSTSTOP	0x00010		/* POST seqeunce aborted	 */
 #define GD_FLG_LOGINIT	0x00020		/* Log Buf has been initialized	 */
-#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)	 */
 
 #define DECLARE_GLOBAL_DATA_PTR register gd_t *gd asm("r5")
 
diff --git a/arch/blackfin/include/asm/global_data.h b/arch/blackfin/include/asm/global_data.h
index c7099e6..3cfd00e 100644
--- a/arch/blackfin/include/asm/global_data.h
+++ b/arch/blackfin/include/asm/global_data.h
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2005-2007 Analog Devices Inc.
  *
- * (C) Copyright 2000-2004
+ * (C) Copyright 2000-2010
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * See file CREDITS for list of people who contributed to this
@@ -53,7 +53,8 @@ typedef struct global_data {
 	unsigned long post_init_f_time;	/* When post_init_f started */
 #endif
 
-	void **jt;		/* jump table */
+	void	**jt;			/* jump table */
+	char	env_buf[32];		/* buffer for getenv() before reloc. */
 } gd_t;
 
 /*
@@ -65,7 +66,7 @@ typedef struct global_data {
 #define	GD_FLG_POSTFAIL	0x00008	/* Critical POST test failed     */
 #define	GD_FLG_POSTSTOP	0x00010	/* POST seqeunce aborted	 */
 #define	GD_FLG_LOGINIT	0x00020	/* Log Buf has been initialized	 */
-#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)	*/
 
 #define DECLARE_GLOBAL_DATA_PTR     register gd_t * volatile gd asm ("P3")
 
diff --git a/arch/i386/include/asm/global_data.h b/arch/i386/include/asm/global_data.h
index 3abbf1d..adf6291 100644
--- a/arch/i386/include/asm/global_data.h
+++ b/arch/i386/include/asm/global_data.h
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2002
+ * (C) Copyright 2002-2010
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * See file CREDITS for list of people who contributed to this
@@ -46,6 +46,7 @@ typedef	struct {
 	phys_size_t	ram_size;	/* RAM size */
 	unsigned long	reset_status;	/* reset status register at boot */
 	void		**jt;		/* jump table */
+	char		env_buf[32];	/* buffer for getenv() before reloc. */
 } gd_t;
 
 /*
@@ -57,7 +58,7 @@ typedef	struct {
 #define	GD_FLG_POSTFAIL	0x00008		/* Critical POST test failed		*/
 #define	GD_FLG_POSTSTOP	0x00010		/* POST seqeunce aborted		*/
 #define	GD_FLG_LOGINIT	0x00020		/* Log Buffer has been initialized	*/
-#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)		*/
 
 extern gd_t *gd;
 
diff --git a/arch/m68k/include/asm/global_data.h b/arch/m68k/include/asm/global_data.h
index 413c200..a8578d8 100644
--- a/arch/m68k/include/asm/global_data.h
+++ b/arch/m68k/include/asm/global_data.h
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2002 - 2003
+ * (C) Copyright 2002 - 2010
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * See file CREDITS for list of people who contributed to this
@@ -64,6 +64,7 @@ typedef	struct	global_data {
 	unsigned long	board_type;
 #endif
 	void		**jt;		/* Standalone app jump table */
+	char		env_buf[32];	/* buffer for getenv() before reloc. */
 } gd_t;
 
 /*
@@ -75,7 +76,7 @@ typedef	struct	global_data {
 #define	GD_FLG_POSTFAIL	0x00008		/* Critical POST test failed		*/
 #define	GD_FLG_POSTSTOP	0x00010		/* POST seqeunce aborted		*/
 #define	GD_FLG_LOGINIT	0x00020		/* Log Buffer has been initialized	*/
-#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)		*/
 
 #if 0
 extern gd_t *global_data;
diff --git a/arch/microblaze/include/asm/global_data.h b/arch/microblaze/include/asm/global_data.h
index ec7837f..c7c1472 100644
--- a/arch/microblaze/include/asm/global_data.h
+++ b/arch/microblaze/include/asm/global_data.h
@@ -43,6 +43,7 @@ typedef	struct	global_data {
 	unsigned long	env_valid;	/* Checksum of Environment valid? */
 	unsigned long	fb_base;	/* base address of frame buffer */
 	void		**jt;		/* jump table */
+	char		env_buf[32];	/* buffer for getenv() before reloc. */
 } gd_t;
 
 /*
@@ -54,7 +55,7 @@ typedef	struct	global_data {
 #define	GD_FLG_POSTFAIL	0x00008		/* Critical POST test failed		*/
 #define	GD_FLG_POSTSTOP	0x00010		/* POST seqeunce aborted		*/
 #define	GD_FLG_LOGINIT	0x00020		/* Log Buffer has been initialized	*/
-#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)		*/
 
 #define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("r31")
 
diff --git a/arch/mips/include/asm/global_data.h b/arch/mips/include/asm/global_data.h
index b2c4891..994e770 100644
--- a/arch/mips/include/asm/global_data.h
+++ b/arch/mips/include/asm/global_data.h
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2002-2003
+ * (C) Copyright 2002-2010
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * See file CREDITS for list of people who contributed to this
@@ -46,6 +46,7 @@ typedef	struct	global_data {
 	unsigned long	env_addr;	/* Address  of Environment struct */
 	unsigned long	env_valid;	/* Checksum of Environment valid? */
 	void		**jt;		/* jump table */
+	char		env_buf[32];	/* buffer for getenv() before reloc. */
 } gd_t;
 
 /*
@@ -57,7 +58,7 @@ typedef	struct	global_data {
 #define	GD_FLG_POSTFAIL	0x00008		/* Critical POST test failed	 */
 #define	GD_FLG_POSTSTOP	0x00010		/* POST seqeunce aborted	 */
 #define	GD_FLG_LOGINIT	0x00020		/* Log Buf has been initialized	 */
-#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)		*/
 
 #define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("k0")
 
diff --git a/arch/nios2/include/asm/global_data.h b/arch/nios2/include/asm/global_data.h
index f1b3482..c292a52 100644
--- a/arch/nios2/include/asm/global_data.h
+++ b/arch/nios2/include/asm/global_data.h
@@ -37,6 +37,7 @@ typedef	struct	global_data {
 	unsigned long	post_init_f_time; /* When post_init_f started */
 #endif
 	void		**jt;		/* Standalone app jump table */
+	char		env_buf[32];	/* buffer for getenv() before reloc. */
 } gd_t;
 
 /* flags */
@@ -46,7 +47,7 @@ typedef	struct	global_data {
 #define	GD_FLG_POSTFAIL	0x00008		/* Critical POST test failed		*/
 #define	GD_FLG_POSTSTOP	0x00010		/* POST seqeunce aborted		*/
 #define	GD_FLG_LOGINIT	0x00020		/* Log Buffer has been initialized	*/
-#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)		*/
 
 #define DECLARE_GLOBAL_DATA_PTR     register gd_t *gd asm ("gp")
 
diff --git a/arch/powerpc/include/asm/global_data.h b/arch/powerpc/include/asm/global_data.h
index c854ce9..3e97f76 100644
--- a/arch/powerpc/include/asm/global_data.h
+++ b/arch/powerpc/include/asm/global_data.h
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2002
+ * (C) Copyright 2002-2010
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * See file CREDITS for list of people who contributed to this
@@ -176,6 +176,7 @@ typedef	struct	global_data {
 	unsigned long long wdt_last;	/* trace watch-dog triggering rate */
 #endif
 	void		**jt;		/* jump table */
+	char		env_buf[32];	/* buffer for getenv() before reloc. */
 } gd_t;
 
 /*
@@ -187,7 +188,7 @@ typedef	struct	global_data {
 #define	GD_FLG_POSTFAIL	0x00008		/* Critical POST test failed		*/
 #define	GD_FLG_POSTSTOP	0x00010		/* POST seqeunce aborted		*/
 #define	GD_FLG_LOGINIT	0x00020		/* Log Buffer has been initialized	*/
-#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)		*/
 
 #if 1
 #define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("r2")
diff --git a/arch/sh/include/asm/global_data.h b/arch/sh/include/asm/global_data.h
index c12b855..7fda1e1 100644
--- a/arch/sh/include/asm/global_data.h
+++ b/arch/sh/include/asm/global_data.h
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2002
+ * (C) Copyright 2002-2010
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2007
@@ -38,7 +38,8 @@ typedef	struct global_data
 	unsigned long	env_addr;	/* Address  of Environment struct */
 	unsigned long	env_valid;	/* Checksum of Environment valid */
 	void		**jt;		/* Standalone app jump table */
-}gd_t;
+	char		env_buf[32];	/* buffer for getenv() before reloc. */
+} gd_t;
 
 #define	GD_FLG_RELOC	0x00001		/* Code was relocated to RAM		*/
 #define	GD_FLG_DEVINIT	0x00002		/* Devices have been initialized	*/
@@ -46,7 +47,7 @@ typedef	struct global_data
 #define	GD_FLG_POSTFAIL	0x00008		/* Critical POST test failed		*/
 #define	GD_FLG_POSTSTOP	0x00010		/* POST seqeunce aborted		*/
 #define	GD_FLG_LOGINIT	0x00020		/* Log Buffer has been initialized	*/
-#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)		*/
 
 #define DECLARE_GLOBAL_DATA_PTR	register gd_t *gd asm ("r13")
 
diff --git a/arch/sparc/include/asm/global_data.h b/arch/sparc/include/asm/global_data.h
index dea2857..de6482f 100644
--- a/arch/sparc/include/asm/global_data.h
+++ b/arch/sparc/include/asm/global_data.h
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2002
+ * (C) Copyright 2002-2010
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2007
@@ -70,7 +70,8 @@ typedef struct global_data {
 #ifdef CONFIG_LWMON
 	unsigned long kbd_status;
 #endif
-	void **jt;		/* jump table */
+	void	**jt;			/* jump table */
+	char	env_buf[32];		/* buffer for getenv() before reloc. */
 } gd_t;
 
 /*
@@ -82,7 +83,7 @@ typedef struct global_data {
 #define	GD_FLG_POSTFAIL	0x00008	/* Critical POST test failed		*/
 #define	GD_FLG_POSTSTOP	0x00010	/* POST seqeunce aborted		*/
 #define	GD_FLG_LOGINIT	0x00020	/* Log Buffer has been initialized	*/
-#define GD_FLG_DISABLE_CONSOLE	0x00040		/* Disable console (in & out)	 */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)	*/
 
 #define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("%g7")