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#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;
}
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