diff options
Diffstat (limited to 'bsps/arm/raspberrypi/start/cmdline.c')
-rw-r--r-- | bsps/arm/raspberrypi/start/cmdline.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/bsps/arm/raspberrypi/start/cmdline.c b/bsps/arm/raspberrypi/start/cmdline.c new file mode 100644 index 0000000000..222b21eb63 --- /dev/null +++ b/bsps/arm/raspberrypi/start/cmdline.c @@ -0,0 +1,55 @@ +/** + * @file + * + * @ingroup raspberrypi + * + * @brief mailbox support. + */ +/* + * Copyright (c) 2015 Yang Qiao + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * + * http://www.rtems.org/license/LICENSE + * + */ + +#include <bsp.h> +#include <bsp/vc.h> + +#include <string.h> + +#define MAX_CMDLINE_LENGTH 1024 +static int rpi_cmdline_ready = -1; +static char rpi_cmdline_cached[MAX_CMDLINE_LENGTH] = "force .data placement"; +static bcm2835_get_cmdline_entries rpi_cmdline_entries; + +const char *rpi_cmdline_get_raw(void) +{ + memset(&rpi_cmdline_entries, 0, sizeof(rpi_cmdline_entries)); + if (bcm2835_mailbox_get_cmdline(&rpi_cmdline_entries) < 0) + return NULL; + return rpi_cmdline_entries.cmdline; +} + +const char *rpi_cmdline_get_cached(void) +{ + if (rpi_cmdline_ready <= 0) { + const char *line = rpi_cmdline_get_raw(); + if (line != NULL) + strncpy(rpi_cmdline_cached, line, MAX_CMDLINE_LENGTH - 1); + rpi_cmdline_cached[MAX_CMDLINE_LENGTH - 1] = 0; + rpi_cmdline_ready = 1; + } + return rpi_cmdline_cached; +} + +const char *rpi_cmdline_get_arg(const char* arg) +{ + const char *opt_data; + opt_data = strstr(rpi_cmdline_get_cached(), arg); + if (opt_data) + opt_data += strlen(arg); + return opt_data; +} |