322 lines
7.9 KiB
C
322 lines
7.9 KiB
C
/*
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* Functions to help device tree manipulation using libfdt.
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* It also provides functions to read entries from device tree proc
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* interface.
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*
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* Copyright 2008 IBM Corporation.
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* Authors: Jerone Young <jyoung5@us.ibm.com>
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* Hollis Blanchard <hollisb@us.ibm.com>
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*
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* This work is licensed under the GNU GPL license version 2 or later.
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*
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "config.h"
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#include "qemu-common.h"
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#include "sysemu/device_tree.h"
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#include "hw/loader.h"
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#include "qemu/option.h"
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#include "qemu/config-file.h"
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#include <libfdt.h>
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#define FDT_MAX_SIZE 0x10000
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void *create_device_tree(int *sizep)
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{
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void *fdt;
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int ret;
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*sizep = FDT_MAX_SIZE;
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fdt = g_malloc0(FDT_MAX_SIZE);
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ret = fdt_create(fdt, FDT_MAX_SIZE);
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if (ret < 0) {
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goto fail;
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}
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ret = fdt_begin_node(fdt, "");
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if (ret < 0) {
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goto fail;
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}
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ret = fdt_end_node(fdt);
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if (ret < 0) {
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goto fail;
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}
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ret = fdt_finish(fdt);
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if (ret < 0) {
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goto fail;
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}
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ret = fdt_open_into(fdt, fdt, *sizep);
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if (ret) {
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fprintf(stderr, "Unable to copy device tree in memory\n");
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exit(1);
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}
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return fdt;
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fail:
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fprintf(stderr, "%s Couldn't create dt: %s\n", __func__, fdt_strerror(ret));
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exit(1);
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}
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void *load_device_tree(const char *filename_path, int *sizep)
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{
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int dt_size;
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int dt_file_load_size;
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int ret;
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void *fdt = NULL;
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*sizep = 0;
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dt_size = get_image_size(filename_path);
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if (dt_size < 0) {
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printf("Unable to get size of device tree file '%s'\n",
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filename_path);
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goto fail;
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}
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/* Expand to 2x size to give enough room for manipulation. */
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dt_size += 10000;
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dt_size *= 2;
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/* First allocate space in qemu for device tree */
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fdt = g_malloc0(dt_size);
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dt_file_load_size = load_image(filename_path, fdt);
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if (dt_file_load_size < 0) {
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printf("Unable to open device tree file '%s'\n",
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filename_path);
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goto fail;
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}
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ret = fdt_open_into(fdt, fdt, dt_size);
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if (ret) {
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printf("Unable to copy device tree in memory\n");
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goto fail;
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}
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/* Check sanity of device tree */
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if (fdt_check_header(fdt)) {
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printf ("Device tree file loaded into memory is invalid: %s\n",
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filename_path);
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goto fail;
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}
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*sizep = dt_size;
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return fdt;
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fail:
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g_free(fdt);
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return NULL;
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}
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static int findnode_nofail(void *fdt, const char *node_path)
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{
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int offset;
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offset = fdt_path_offset(fdt, node_path);
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if (offset < 0) {
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fprintf(stderr, "%s Couldn't find node %s: %s\n", __func__, node_path,
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fdt_strerror(offset));
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exit(1);
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}
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return offset;
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}
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int qemu_devtree_setprop(void *fdt, const char *node_path,
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const char *property, const void *val_array, int size)
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{
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int r;
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r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val_array, size);
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if (r < 0) {
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fprintf(stderr, "%s: Couldn't set %s/%s: %s\n", __func__, node_path,
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property, fdt_strerror(r));
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exit(1);
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}
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return r;
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}
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int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
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const char *property, uint32_t val)
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{
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int r;
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r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val);
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if (r < 0) {
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fprintf(stderr, "%s: Couldn't set %s/%s = %#08x: %s\n", __func__,
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node_path, property, val, fdt_strerror(r));
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exit(1);
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}
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return r;
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}
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int qemu_devtree_setprop_u64(void *fdt, const char *node_path,
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const char *property, uint64_t val)
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{
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val = cpu_to_be64(val);
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return qemu_devtree_setprop(fdt, node_path, property, &val, sizeof(val));
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}
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int qemu_devtree_setprop_string(void *fdt, const char *node_path,
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const char *property, const char *string)
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{
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int r;
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r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string);
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if (r < 0) {
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fprintf(stderr, "%s: Couldn't set %s/%s = %s: %s\n", __func__,
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node_path, property, string, fdt_strerror(r));
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exit(1);
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}
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return r;
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}
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const void *qemu_devtree_getprop(void *fdt, const char *node_path,
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const char *property, int *lenp)
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{
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int len;
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const void *r;
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if (!lenp) {
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lenp = &len;
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}
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r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp);
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if (!r) {
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fprintf(stderr, "%s: Couldn't get %s/%s: %s\n", __func__,
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node_path, property, fdt_strerror(*lenp));
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exit(1);
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}
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return r;
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}
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uint32_t qemu_devtree_getprop_cell(void *fdt, const char *node_path,
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const char *property)
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{
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int len;
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const uint32_t *p = qemu_devtree_getprop(fdt, node_path, property, &len);
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if (len != 4) {
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fprintf(stderr, "%s: %s/%s not 4 bytes long (not a cell?)\n",
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__func__, node_path, property);
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exit(1);
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}
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return be32_to_cpu(*p);
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}
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uint32_t qemu_devtree_get_phandle(void *fdt, const char *path)
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{
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uint32_t r;
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r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));
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if (r <= 0) {
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fprintf(stderr, "%s: Couldn't get phandle for %s: %s\n", __func__,
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path, fdt_strerror(r));
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exit(1);
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}
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return r;
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}
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int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
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const char *property,
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const char *target_node_path)
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{
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uint32_t phandle = qemu_devtree_get_phandle(fdt, target_node_path);
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return qemu_devtree_setprop_cell(fdt, node_path, property, phandle);
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}
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uint32_t qemu_devtree_alloc_phandle(void *fdt)
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{
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static int phandle = 0x0;
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/*
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* We need to find out if the user gave us special instruction at
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* which phandle id to start allocting phandles.
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*/
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if (!phandle) {
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QemuOpts *machine_opts;
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machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
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if (machine_opts) {
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const char *phandle_start;
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phandle_start = qemu_opt_get(machine_opts, "phandle_start");
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if (phandle_start) {
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phandle = strtoul(phandle_start, NULL, 0);
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}
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}
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}
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if (!phandle) {
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/*
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* None or invalid phandle given on the command line, so fall back to
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* default starting point.
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*/
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phandle = 0x8000;
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}
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return phandle++;
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}
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int qemu_devtree_nop_node(void *fdt, const char *node_path)
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{
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int r;
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r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path));
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if (r < 0) {
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fprintf(stderr, "%s: Couldn't nop node %s: %s\n", __func__, node_path,
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fdt_strerror(r));
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exit(1);
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}
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return r;
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}
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int qemu_devtree_add_subnode(void *fdt, const char *name)
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{
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char *dupname = g_strdup(name);
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char *basename = strrchr(dupname, '/');
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int retval;
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int parent = 0;
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if (!basename) {
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g_free(dupname);
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return -1;
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}
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basename[0] = '\0';
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basename++;
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if (dupname[0]) {
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parent = findnode_nofail(fdt, dupname);
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}
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retval = fdt_add_subnode(fdt, parent, basename);
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if (retval < 0) {
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fprintf(stderr, "FDT: Failed to create subnode %s: %s\n", name,
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fdt_strerror(retval));
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exit(1);
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}
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g_free(dupname);
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return retval;
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}
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void qemu_devtree_dumpdtb(void *fdt, int size)
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{
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QemuOpts *machine_opts;
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machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
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if (machine_opts) {
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const char *dumpdtb = qemu_opt_get(machine_opts, "dumpdtb");
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if (dumpdtb) {
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/* Dump the dtb to a file and quit */
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exit(g_file_set_contents(dumpdtb, fdt, size, NULL) ? 0 : 1);
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}
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}
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}
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