xref: /openbmc/u-boot/env/embedded.c (revision e8f80a5a)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2001
4  * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
5  */
6 
7 #include <linux/kconfig.h>
8 
9 #ifndef __ASSEMBLY__
10 #define	__ASSEMBLY__			/* Dirty trick to get only #defines */
11 #endif
12 #define	__ASM_STUB_PROCESSOR_H__	/* don't include asm/processor. */
13 #include <config.h>
14 #undef	__ASSEMBLY__
15 #include <environment.h>
16 #include <linux/stringify.h>
17 
18 /* Handle HOSTS that have prepended crap on symbol names, not TARGETS. */
19 #if defined(__APPLE__)
20 /* Leading underscore on symbols */
21 #  define SYM_CHAR "_"
22 #else /* No leading character on symbols */
23 #  define SYM_CHAR
24 #endif
25 
26 /*
27  * Generate embedded environment table
28  * inside U-Boot image, if needed.
29  */
30 #if defined(ENV_IS_EMBEDDED) || defined(CONFIG_BUILD_ENVCRC)
31 /*
32  * Put the environment in the .text section when we are building
33  * U-Boot proper.  The host based program "tools/envcrc" does not need
34  * a seperate section.
35  */
36 #if defined(USE_HOSTCC) /* Native for 'tools/envcrc' */
37 #  define __UBOOT_ENV_SECTION__(name)	/*XXX DO_NOT_DEL_THIS_COMMENT*/
38 
39 #else /* Environment is embedded in U-Boot's .text section */
40 /* XXX - This only works with GNU C */
41 #  define __UBOOT_ENV_SECTION__(name)	__attribute__ ((section(".text."#name)))
42 #endif
43 
44 /*
45  * Macros to generate global absolutes.
46  */
47 #if defined(__bfin__)
48 # define GEN_SET_VALUE(name, value)	\
49 	asm(".set " GEN_SYMNAME(name) ", " GEN_VALUE(value))
50 #else
51 # define GEN_SET_VALUE(name, value)	\
52 	asm(GEN_SYMNAME(name) " = " GEN_VALUE(value))
53 #endif
54 #define GEN_SYMNAME(str)	SYM_CHAR #str
55 #define GEN_VALUE(str)		#str
56 #define GEN_ABS(name, value)			\
57 	asm(".globl " GEN_SYMNAME(name));	\
58 	GEN_SET_VALUE(name, value)
59 
60 /*
61  * Check to see if we are building with a
62  * computed CRC.  Otherwise define it as ~0.
63  */
64 #if !defined(ENV_CRC)
65 #  define ENV_CRC	(~0)
66 #endif
67 
68 #define DEFAULT_ENV_INSTANCE_EMBEDDED
69 #include <env_default.h>
70 
71 #ifdef CONFIG_ENV_ADDR_REDUND
72 env_t redundand_environment __UBOOT_ENV_SECTION__(redundand_environment) = {
73 	0,		/* CRC Sum: invalid */
74 	0,		/* Flags:   invalid */
75 	{
76 	"\0"
77 	}
78 };
79 #endif	/* CONFIG_ENV_ADDR_REDUND */
80 
81 /*
82  * These will end up in the .text section
83  * if the environment strings are embedded
84  * in the image.  When this is used for
85  * tools/envcrc, they are placed in the
86  * .data/.sdata section.
87  *
88  */
89 unsigned long env_size __UBOOT_ENV_SECTION__(env_size) = sizeof(env_t);
90 
91 /*
92  * Add in absolutes.
93  */
94 GEN_ABS(env_offset, CONFIG_ENV_OFFSET);
95 
96 #endif /* ENV_IS_EMBEDDED */
97