diff options
Diffstat (limited to '')
| -rw-r--r-- | kexec/dt-ops.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/kexec/dt-ops.c b/kexec/dt-ops.c new file mode 100644 index 0000000..0a96b75 --- /dev/null +++ b/kexec/dt-ops.c @@ -0,0 +1,176 @@ +#include <assert.h> +#include <errno.h> +#include <inttypes.h> +#include <libfdt.h> +#include <stdio.h> +#include <stdlib.h> + +#include "kexec.h" +#include "dt-ops.h" + +static const char n_chosen[] = "chosen"; + +static const char p_bootargs[] = "bootargs"; +static const char p_initrd_start[] = "linux,initrd-start"; +static const char p_initrd_end[] = "linux,initrd-end"; + +int dtb_set_initrd(char **dtb, off_t *dtb_size, off_t start, off_t end) +{ + int result; + uint64_t value; + + dbgprintf("%s: start %jd, end %jd, size %jd (%jd KiB)\n", + __func__, (intmax_t)start, (intmax_t)end, + (intmax_t)(end - start), + (intmax_t)(end - start) / 1024); + + value = cpu_to_fdt64(start); + + result = dtb_set_property(dtb, dtb_size, n_chosen, p_initrd_start, + &value, sizeof(value)); + + if (result) + return result; + + value = cpu_to_fdt64(end); + + result = dtb_set_property(dtb, dtb_size, n_chosen, p_initrd_end, + &value, sizeof(value)); + + if (result) { + dtb_delete_property(*dtb, n_chosen, p_initrd_start); + return result; + } + + return 0; +} + +void dtb_clear_initrd(char **dtb, off_t *dtb_size) +{ + dtb_delete_property(*dtb, n_chosen, p_initrd_start); + dtb_delete_property(*dtb, n_chosen, p_initrd_end); +} + +int dtb_set_bootargs(char **dtb, off_t *dtb_size, const char *command_line) +{ + return dtb_set_property(dtb, dtb_size, n_chosen, p_bootargs, + command_line, strlen(command_line) + 1); +} + +int dtb_set_property(char **dtb, off_t *dtb_size, const char *node, + const char *prop, const void *value, int value_len) +{ + int result; + int nodeoffset; + void *new_dtb; + int new_size; + char *new_node = NULL; + + value_len = FDT_TAGALIGN(value_len); + + new_size = FDT_TAGALIGN(*dtb_size + fdt_node_len(node) + + fdt_prop_len(prop, value_len)); + + new_dtb = malloc(new_size); + + if (!new_dtb) { + dbgprintf("%s: malloc failed\n", __func__); + return -ENOMEM; + } + + result = fdt_open_into(*dtb, new_dtb, new_size); + + if (result) { + dbgprintf("%s: fdt_open_into failed: %s\n", __func__, + fdt_strerror(result)); + goto on_error; + } + + new_node = malloc(strlen("/") + strlen(node) + 1); + if (!new_node) { + dbgprintf("%s: malloc failed\n", __func__); + result = -ENOMEM; + goto on_error; + } + + strcpy(new_node, "/"); + strcat(new_node, node); + + nodeoffset = fdt_path_offset(new_dtb, new_node); + + if (nodeoffset == -FDT_ERR_NOTFOUND) { + result = fdt_add_subnode(new_dtb, 0, node); + + if (result < 0) { + dbgprintf("%s: fdt_add_subnode failed: %s\n", __func__, + fdt_strerror(result)); + goto on_error; + } + nodeoffset = result; + } else if (nodeoffset < 0) { + dbgprintf("%s: fdt_path_offset failed: %s\n", __func__, + fdt_strerror(nodeoffset)); + goto on_error; + } + + result = fdt_setprop(new_dtb, nodeoffset, prop, value, value_len); + + if (result) { + dbgprintf("%s: fdt_setprop failed: %s\n", __func__, + fdt_strerror(result)); + goto on_error; + } + + /* + * Can't call free on dtb since dtb may have been mmaped by + * slurp_file(). + */ + + result = fdt_pack(new_dtb); + + if (result) + dbgprintf("%s: Unable to pack device tree: %s\n", __func__, + fdt_strerror(result)); + + *dtb = new_dtb; + *dtb_size = fdt_totalsize(*dtb); + + return 0; + +on_error: + free(new_dtb); + free(new_node); + return result; +} + +int dtb_delete_property(char *dtb, const char *node, const char *prop) +{ + int result, nodeoffset; + char *new_node = NULL; + + new_node = malloc(strlen("/") + strlen(node) + 1); + if (!new_node) { + dbgprintf("%s: malloc failed\n", __func__); + return -ENOMEM; + } + + strcpy(new_node, "/"); + strcat(new_node, node); + + nodeoffset = fdt_path_offset(dtb, new_node); + if (nodeoffset < 0) { + dbgprintf("%s: fdt_path_offset failed: %s\n", __func__, + fdt_strerror(nodeoffset)); + free(new_node); + return nodeoffset; + } + + result = fdt_delprop(dtb, nodeoffset, prop); + + if (result) + dbgprintf("%s: fdt_delprop failed: %s\n", __func__, + fdt_strerror(nodeoffset)); + + free(new_node); + return result; +} |