diff options
Diffstat (limited to 'common/hwconfig.c')
| -rw-r--r-- | common/hwconfig.c | 86 |
1 files changed, 44 insertions, 42 deletions
diff --git a/common/hwconfig.c b/common/hwconfig.c index 193863a..5150748 100644 --- a/common/hwconfig.c +++ b/common/hwconfig.c @@ -2,6 +2,7 @@ * An inteface for configuring a hardware via u-boot environment. * * Copyright (c) 2009 MontaVista Software, Inc. + * Copyright 2011 Freescale Semiconductor, Inc. * * Author: Anton Vorontsov <avorontsov@ru.mvista.com> * @@ -71,25 +72,19 @@ next: const char cpu_hwconfig[] __attribute__((weak)) = ""; const char board_hwconfig[] __attribute__((weak)) = ""; -#define HWCONFIG_PRE_RELOC_BUF_SIZE 128 - -static const char *__hwconfig(const char *opt, size_t *arglen) +static const char *__hwconfig(const char *opt, size_t *arglen, + const char *env_hwconfig) { - const char *env_hwconfig = NULL, *ret; - char buf[HWCONFIG_PRE_RELOC_BUF_SIZE]; + const char *ret; - if (gd->flags & GD_FLG_ENV_READY) { + /* if we are passed a buffer use it, otherwise try the environment */ + if (!env_hwconfig) { + if (!(gd->flags & GD_FLG_ENV_READY)) { + printf("WARNING: Calling __hwconfig without a buffer " + "and before environment is ready\n"); + return NULL; + } env_hwconfig = getenv("hwconfig"); - } else { - /* - * Use our own on stack based buffer before relocation to allow - * accessing longer hwconfig strings that might be in the - * environment before we've relocated. This is pretty fragile - * on both the use of stack and if the buffer is big enough. - * However we will get a warning from getenv_f for the later. - */ - if ((getenv_f("hwconfig", buf, sizeof(buf))) > 0) - env_hwconfig = buf; } if (env_hwconfig) { @@ -109,8 +104,9 @@ static const char *__hwconfig(const char *opt, size_t *arglen) } /* - * hwconfig - query if a particular hwconfig option is specified + * hwconfig_f - query if a particular hwconfig option is specified * @opt: a string representing an option + * @buf: if non-NULL use this buffer to parse, otherwise try env * * This call can be used to find out whether U-Boot should configure * a particular hardware option. @@ -127,34 +123,36 @@ static const char *__hwconfig(const char *opt, size_t *arglen) * that the board file only calls things that are actually used, so * hwconfig() will always return true result. */ -int hwconfig(const char *opt) +int hwconfig_f(const char *opt, char *buf) { - return !!__hwconfig(opt, NULL); + return !!__hwconfig(opt, NULL, buf); } /* - * hwconfig_arg - get hwconfig option's argument + * hwconfig_arg_f - get hwconfig option's argument * @opt: a string representing an option * @arglen: a pointer to an allocated size_t variable + * @buf: if non-NULL use this buffer to parse, otherwise try env * - * Unlike hwconfig() function, this function returns a pointer to the + * Unlike hwconfig_f() function, this function returns a pointer to the * start of the hwconfig arguments, if option is not found or it has * no specified arguments, the function returns NULL pointer. * * If CONFIG_HWCONFIG is undefined, the function returns "", and * arglen is set to 0. */ -const char *hwconfig_arg(const char *opt, size_t *arglen) +const char *hwconfig_arg_f(const char *opt, size_t *arglen, char *buf) { - return __hwconfig(opt, arglen); + return __hwconfig(opt, arglen, buf); } /* - * hwconfig_arg_cmp - compare hwconfig option's argument + * hwconfig_arg_cmp_f - compare hwconfig option's argument * @opt: a string representing an option * @arg: a string for comparing an option's argument + * @buf: if non-NULL use this buffer to parse, otherwise try env * - * This call is similar to hwconfig_arg, but instead of returning + * This call is similar to hwconfig_arg_f, but instead of returning * hwconfig argument and its length, it is comparing it to @arg. * * Returns non-zero value if @arg matches, 0 otherwise. @@ -162,12 +160,12 @@ const char *hwconfig_arg(const char *opt, size_t *arglen) * If CONFIG_HWCONFIG is undefined, the function returns a non-zero * value, i.e. the argument matches. */ -int hwconfig_arg_cmp(const char *opt, const char *arg) +int hwconfig_arg_cmp_f(const char *opt, const char *arg, char *buf) { const char *argstr; size_t arglen; - argstr = hwconfig_arg(opt, &arglen); + argstr = hwconfig_arg_f(opt, &arglen, buf); if (!argstr || arglen != strlen(arg)) return 0; @@ -175,63 +173,67 @@ int hwconfig_arg_cmp(const char *opt, const char *arg) } /* - * hwconfig_sub - query if a particular hwconfig sub-option is specified + * hwconfig_sub_f - query if a particular hwconfig sub-option is specified * @opt: a string representing an option * @subopt: a string representing a sub-option + * @buf: if non-NULL use this buffer to parse, otherwise try env * - * This call is similar to hwconfig(), except that it takes additional + * This call is similar to hwconfig_f(), except that it takes additional * argument @subopt. In this example: * "dr_usb:mode=peripheral" * "dr_usb" is an option, "mode" is a sub-option, and "peripheral" is its * argument. */ -int hwconfig_sub(const char *opt, const char *subopt) +int hwconfig_sub_f(const char *opt, const char *subopt, char *buf) { size_t arglen; const char *arg; - arg = __hwconfig(opt, &arglen); + arg = __hwconfig(opt, &arglen, buf); if (!arg) return 0; return !!hwconfig_parse(arg, arglen, subopt, ",;", '=', NULL); } /* - * hwconfig_subarg - get hwconfig sub-option's argument + * hwconfig_subarg_f - get hwconfig sub-option's argument * @opt: a string representing an option * @subopt: a string representing a sub-option * @subarglen: a pointer to an allocated size_t variable + * @buf: if non-NULL use this buffer to parse, otherwise try env * - * This call is similar to hwconfig_arg(), except that it takes an additional - * argument @subopt, and so works with sub-options. + * This call is similar to hwconfig_arg_f(), except that it takes an + * additional argument @subopt, and so works with sub-options. */ -const char *hwconfig_subarg(const char *opt, const char *subopt, - size_t *subarglen) +const char *hwconfig_subarg_f(const char *opt, const char *subopt, + size_t *subarglen, char *buf) { size_t arglen; const char *arg; - arg = __hwconfig(opt, &arglen); + arg = __hwconfig(opt, &arglen, buf); if (!arg) return NULL; return hwconfig_parse(arg, arglen, subopt, ",;", '=', subarglen); } /* - * hwconfig_arg_cmp - compare hwconfig sub-option's argument + * hwconfig_arg_cmp_f - compare hwconfig sub-option's argument * @opt: a string representing an option * @subopt: a string representing a sub-option * @subarg: a string for comparing an sub-option's argument + * @buf: if non-NULL use this buffer to parse, otherwise try env * - * This call is similar to hwconfig_arg_cmp, except that it takes an additional - * argument @subopt, and so works with sub-options. + * This call is similar to hwconfig_arg_cmp_f, except that it takes an + * additional argument @subopt, and so works with sub-options. */ -int hwconfig_subarg_cmp(const char *opt, const char *subopt, const char *subarg) +int hwconfig_subarg_cmp_f(const char *opt, const char *subopt, + const char *subarg, char *buf) { const char *argstr; size_t arglen; - argstr = hwconfig_subarg(opt, subopt, &arglen); + argstr = hwconfig_subarg_f(opt, subopt, &arglen, buf); if (!argstr || arglen != strlen(subarg)) return 0; |