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Make getenv() work before relocation.

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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>
This commit is contained in:
Wolfgang Denk 2010-07-24 20:22:02 +02:00
parent 6d014adfa2
commit 91a76751a0
12 changed files with 51 additions and 39 deletions
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9
arch/arm/include/asm/global_data.h
View file

@ -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
@ -46,14 +46,9 @@ typedef struct global_data {
#endif
#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;
/*

1
arch/avr32/include/asm/global_data.h
View file

@ -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;
/*

3
arch/blackfin/include/asm/global_data.h
View file

@ -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
@ -54,6 +54,7 @@ typedef struct global_data {
#endif
void **jt; /* jump table */
char env_buf[32]; /* buffer for getenv() before reloc. */
} gd_t;
/*

3
arch/i386/include/asm/global_data.h
View file

@ -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;
/*

3
arch/m68k/include/asm/global_data.h
View file

@ -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;
/*

1
arch/microblaze/include/asm/global_data.h
View file

@ -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;
/*

3
arch/mips/include/asm/global_data.h
View file

@ -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;
/*

1
arch/nios2/include/asm/global_data.h
View file

@ -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 */

3
arch/powerpc/include/asm/global_data.h
View file

@ -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;
/*

5
arch/sh/include/asm/global_data.h
View file

@ -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 */

3
arch/sparc/include/asm/global_data.h
View file

@ -1,5 +1,5 @@
/*
* (C) Copyright 2002
* (C) Copyright 2002-2010
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2007
@ -71,6 +71,7 @@ typedef struct global_data {
unsigned long kbd_status;
#endif
void **jt; /* jump table */
char env_buf[32]; /* buffer for getenv() before reloc. */
} gd_t;
/*

7
common/cmd_nvedit.c
View file

@ -511,6 +511,7 @@ int do_editenv(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
char *getenv (char *name)
{
if (gd->flags & GD_FLG_RELOC) { /* full C runtime after reloc */
int i, nxt;
WATCHDOG_RESET();
@ -529,6 +530,12 @@ char *getenv (char *name)
}
return (NULL);
}
/* restricted C runtime before reloc */
return ((getenv_f(name,gd->env_buf,sizeof(gd->env_buf)) > 0) ?
gd->env_buf : NULL);
}
int getenv_f(char *name, char *buf, unsigned len)