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/*
* Functions to help device tree manipulation using libfdt.
* It also provides functions to read entries from device tree proc
* interface.
*
* Copyright 2008 IBM Corporation.
* Authors: Jerone Young <jyoung5@us.ibm.com>
*
* This work is licensed under the GNU GPL license version 2 or later.
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include "config.h"
#include "ppc440.h"
#ifdef CONFIG_LIBFDT
#include "libfdt.h"
#endif
#define DT_PROC_INTERFACE_PATH "/proc/device-tree"
/* FUNCTIONS FOR READING FROM DEVICE TREE OF HOST IN /PROC */
/* This function reads device-tree property files that are of
* a single cell size
*/
uint32_t read_proc_dt_prop_cell(const char *path_in_device_tree)
{
char *buf = NULL;
int i;
uint32_t num;
FILE *stream;
i = asprintf(&buf, "%s/%s", DT_PROC_INTERFACE_PATH,
path_in_device_tree);
if (i < 0) {
printf("%s: Unable to malloc string buffer buf\n",
__func__);
exit(1);
}
stream = fopen(buf, "rb");
if (stream == NULL) {
printf("%s: Unable to open '%s'\n", __func__, buf);
exit(1);
}
fread(&num, sizeof(num), 1, stream);
fclose(stream);
free(buf);
return num;
}
/* FUNCTIONS FOR LOADING & MANIPULATION OF DEVICE TREE IN GUEST */
#ifdef CONFIG_LIBFDT
/* support functions */
static int get_offset_of_node(void *fdt, const char *node_path)
{
int node_offset;
node_offset = fdt_path_offset(fdt, node_path);
if (node_offset < 0) {
printf("Unable to find node in device tree '%s'\n",
node_path);
exit(1);
}
return node_offset;
}
/* public functions */
void *load_device_tree(const char *filename_path, unsigned long load_addr)
{
int dt_file_size;
int dt_file_load_size;
int new_dt_size;
int ret;
void *dt_file = NULL;
void *fdt;
dt_file_size = get_image_size(filename_path);
if (dt_file_size < 0) {
printf("Unable to get size of device tree file '%s'\n",
filename_path);
goto fail;
}
/* First allocate space in qemu for device tree */
dt_file = qemu_malloc(dt_file_size);
if (dt_file == NULL) {
printf("Unable to allocate memory in qemu for device tree\n");
goto fail;
}
memset(dt_file, 0, dt_file_size);
dt_file_load_size = load_image(filename_path, dt_file);
/* XXX Second we place new copy of 2x size in guest memory
* This give us enough room for manipulation.
*/
new_dt_size = dt_file_size * 2;
fdt = (void *)load_addr;
ret = fdt_open_into(dt_file, fdt, new_dt_size);
if (ret) {
printf("Unable to copy device tree in memory\n");
goto fail;
}
/* Check sanity of device tree */
if (fdt_check_header(fdt)) {
printf ("Device tree file loaded into memory is invalid: %s\n",
filename_path);
goto fail;
}
/* free qemu memory with old device tree */
qemu_free(dt_file);
return fdt;
fail:
if (dt_file)
qemu_free(dt_file);
return NULL;
}
void dump_device_tree_to_file(void *fdt, const char *filename)
{
int fd;
fd = open(filename, O_RDWR|O_CREAT, O_RDWR);
if (fd < 0) {
printf("Failed to open file %s\n Cannot dum device-tree\n",
filename);
return;
}
write(fd, fdt, fdt_totalsize(fdt));
close(fd);
}
void dt_cell(void *fdt, const char *node_path, const char *property,
uint32_t val)
{
int offset;
int ret;
offset = get_offset_of_node(fdt, node_path);
ret = fdt_setprop_cell(fdt, offset, property, val);
if (ret < 0) {
printf("Unable to set device tree property '%s'\n",
property);
exit(1);
}
}
/* This function is to manipulate a cell with multiple values */
void dt_cell_multi(void *fdt, const char *node_path, const char *property,
uint32_t *val_array, int size)
{
int offset;
int ret;
offset = get_offset_of_node(fdt, node_path);
ret = fdt_setprop(fdt, offset, property, val_array, size);
if (ret < 0) {
printf("Unable to set device tree property '%s'\n",
property);
exit(1);
}
}
void dt_string(void *fdt, const char *node_path, const char *property,
char *string)
{
int offset;
int ret;
offset = get_offset_of_node(fdt, node_path);
ret = fdt_setprop_string(fdt, offset, property, string);
if (ret < 0) {
printf("Unable to set device tree property '%s'\n",
property);
exit(1);
}
}
#endif
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