+++ /dev/null
-/*
- * 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>
- * Hollis Blanchard <hollisb@us.ibm.com>
- *
- * This work is licensed under the GNU GPL license version 2 or later.
- *
- */
-
-#include "qemu/osdep.h"
-
-#ifdef CONFIG_LINUX
-#include <dirent.h>
-#endif
-
-#include "qapi/error.h"
-#include "qemu-common.h"
-#include "qemu/error-report.h"
-#include "sysemu/device_tree.h"
-#include "sysemu/sysemu.h"
-#include "hw/loader.h"
-#include "hw/boards.h"
-#include "qemu/config-file.h"
-
-#include <libfdt.h>
-
-#define FDT_MAX_SIZE 0x10000
-
-void *create_device_tree(int *sizep)
-{
- void *fdt;
- int ret;
-
- *sizep = FDT_MAX_SIZE;
- fdt = g_malloc0(FDT_MAX_SIZE);
- ret = fdt_create(fdt, FDT_MAX_SIZE);
- if (ret < 0) {
- goto fail;
- }
- ret = fdt_finish_reservemap(fdt);
- if (ret < 0) {
- goto fail;
- }
- ret = fdt_begin_node(fdt, "");
- if (ret < 0) {
- goto fail;
- }
- ret = fdt_end_node(fdt);
- if (ret < 0) {
- goto fail;
- }
- ret = fdt_finish(fdt);
- if (ret < 0) {
- goto fail;
- }
- ret = fdt_open_into(fdt, fdt, *sizep);
- if (ret) {
- error_report("Unable to copy device tree in memory");
- exit(1);
- }
-
- return fdt;
-fail:
- error_report("%s Couldn't create dt: %s", __func__, fdt_strerror(ret));
- exit(1);
-}
-
-void *load_device_tree(const char *filename_path, int *sizep)
-{
- int dt_size;
- int dt_file_load_size;
- int ret;
- void *fdt = NULL;
-
- *sizep = 0;
- dt_size = get_image_size(filename_path);
- if (dt_size < 0) {
- error_report("Unable to get size of device tree file '%s'",
- filename_path);
- goto fail;
- }
-
- /* Expand to 2x size to give enough room for manipulation. */
- dt_size += 10000;
- dt_size *= 2;
- /* First allocate space in qemu for device tree */
- fdt = g_malloc0(dt_size);
-
- dt_file_load_size = load_image(filename_path, fdt);
- if (dt_file_load_size < 0) {
- error_report("Unable to open device tree file '%s'",
- filename_path);
- goto fail;
- }
-
- ret = fdt_open_into(fdt, fdt, dt_size);
- if (ret) {
- error_report("Unable to copy device tree in memory");
- goto fail;
- }
-
- /* Check sanity of device tree */
- if (fdt_check_header(fdt)) {
- error_report("Device tree file loaded into memory is invalid: %s",
- filename_path);
- goto fail;
- }
- *sizep = dt_size;
- return fdt;
-
-fail:
- g_free(fdt);
- return NULL;
-}
-
-#ifdef CONFIG_LINUX
-
-#define SYSFS_DT_BASEDIR "/proc/device-tree"
-
-/**
- * read_fstree: this function is inspired from dtc read_fstree
- * @fdt: preallocated fdt blob buffer, to be populated
- * @dirname: directory to scan under SYSFS_DT_BASEDIR
- * the search is recursive and the tree is searched down to the
- * leaves (property files).
- *
- * the function asserts in case of error
- */
-static void read_fstree(void *fdt, const char *dirname)
-{
- DIR *d;
- struct dirent *de;
- struct stat st;
- const char *root_dir = SYSFS_DT_BASEDIR;
- const char *parent_node;
-
- if (strstr(dirname, root_dir) != dirname) {
- error_setg(&error_fatal, "%s: %s must be searched within %s",
- __func__, dirname, root_dir);
- }
- parent_node = &dirname[strlen(SYSFS_DT_BASEDIR)];
-
- d = opendir(dirname);
- if (!d) {
- error_setg(&error_fatal, "%s cannot open %s", __func__, dirname);
- }
-
- while ((de = readdir(d)) != NULL) {
- char *tmpnam;
-
- if (!g_strcmp0(de->d_name, ".")
- || !g_strcmp0(de->d_name, "..")) {
- continue;
- }
-
- tmpnam = g_strdup_printf("%s/%s", dirname, de->d_name);
-
- if (lstat(tmpnam, &st) < 0) {
- error_setg(&error_fatal, "%s cannot lstat %s", __func__, tmpnam);
- }
-
- if (S_ISREG(st.st_mode)) {
- gchar *val;
- gsize len;
-
- if (!g_file_get_contents(tmpnam, &val, &len, NULL)) {
- error_setg(&error_fatal, "%s not able to extract info from %s",
- __func__, tmpnam);
- }
-
- if (strlen(parent_node) > 0) {
- qemu_fdt_setprop(fdt, parent_node,
- de->d_name, val, len);
- } else {
- qemu_fdt_setprop(fdt, "/", de->d_name, val, len);
- }
- g_free(val);
- } else if (S_ISDIR(st.st_mode)) {
- char *node_name;
-
- node_name = g_strdup_printf("%s/%s",
- parent_node, de->d_name);
- qemu_fdt_add_subnode(fdt, node_name);
- g_free(node_name);
- read_fstree(fdt, tmpnam);
- }
-
- g_free(tmpnam);
- }
-
- closedir(d);
-}
-
-/* load_device_tree_from_sysfs: extract the dt blob from host sysfs */
-void *load_device_tree_from_sysfs(void)
-{
- void *host_fdt;
- int host_fdt_size;
-
- host_fdt = create_device_tree(&host_fdt_size);
- read_fstree(host_fdt, SYSFS_DT_BASEDIR);
- if (fdt_check_header(host_fdt)) {
- error_setg(&error_fatal,
- "%s host device tree extracted into memory is invalid",
- __func__);
- }
- return host_fdt;
-}
-
-#endif /* CONFIG_LINUX */
-
-static int findnode_nofail(void *fdt, const char *node_path)
-{
- int offset;
-
- offset = fdt_path_offset(fdt, node_path);
- if (offset < 0) {
- error_report("%s Couldn't find node %s: %s", __func__, node_path,
- fdt_strerror(offset));
- exit(1);
- }
-
- return offset;
-}
-
-char **qemu_fdt_node_path(void *fdt, const char *name, char *compat,
- Error **errp)
-{
- int offset, len, ret;
- const char *iter_name;
- unsigned int path_len = 16, n = 0;
- GSList *path_list = NULL, *iter;
- char **path_array;
-
- offset = fdt_node_offset_by_compatible(fdt, -1, compat);
-
- while (offset >= 0) {
- iter_name = fdt_get_name(fdt, offset, &len);
- if (!iter_name) {
- offset = len;
- break;
- }
- if (!strcmp(iter_name, name)) {
- char *path;
-
- path = g_malloc(path_len);
- while ((ret = fdt_get_path(fdt, offset, path, path_len))
- == -FDT_ERR_NOSPACE) {
- path_len += 16;
- path = g_realloc(path, path_len);
- }
- path_list = g_slist_prepend(path_list, path);
- n++;
- }
- offset = fdt_node_offset_by_compatible(fdt, offset, compat);
- }
-
- if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
- error_setg(errp, "%s: abort parsing dt for %s/%s: %s",
- __func__, name, compat, fdt_strerror(offset));
- for (iter = path_list; iter; iter = iter->next) {
- g_free(iter->data);
- }
- g_slist_free(path_list);
- return NULL;
- }
-
- path_array = g_new(char *, n + 1);
- path_array[n--] = NULL;
-
- for (iter = path_list; iter; iter = iter->next) {
- path_array[n--] = iter->data;
- }
-
- g_slist_free(path_list);
-
- return path_array;
-}
-
-int qemu_fdt_setprop(void *fdt, const char *node_path,
- const char *property, const void *val, int size)
-{
- int r;
-
- r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val, size);
- if (r < 0) {
- error_report("%s: Couldn't set %s/%s: %s", __func__, node_path,
- property, fdt_strerror(r));
- exit(1);
- }
-
- return r;
-}
-
-int qemu_fdt_setprop_cell(void *fdt, const char *node_path,
- const char *property, uint32_t val)
-{
- int r;
-
- r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val);
- if (r < 0) {
- error_report("%s: Couldn't set %s/%s = %#08x: %s", __func__,
- node_path, property, val, fdt_strerror(r));
- exit(1);
- }
-
- return r;
-}
-
-int qemu_fdt_setprop_u64(void *fdt, const char *node_path,
- const char *property, uint64_t val)
-{
- val = cpu_to_be64(val);
- return qemu_fdt_setprop(fdt, node_path, property, &val, sizeof(val));
-}
-
-int qemu_fdt_setprop_string(void *fdt, const char *node_path,
- const char *property, const char *string)
-{
- int r;
-
- r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string);
- if (r < 0) {
- error_report("%s: Couldn't set %s/%s = %s: %s", __func__,
- node_path, property, string, fdt_strerror(r));
- exit(1);
- }
-
- return r;
-}
-
-const void *qemu_fdt_getprop(void *fdt, const char *node_path,
- const char *property, int *lenp, Error **errp)
-{
- int len;
- const void *r;
-
- if (!lenp) {
- lenp = &len;
- }
- r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp);
- if (!r) {
- error_setg(errp, "%s: Couldn't get %s/%s: %s", __func__,
- node_path, property, fdt_strerror(*lenp));
- }
- return r;
-}
-
-uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path,
- const char *property, int *lenp, Error **errp)
-{
- int len;
- const uint32_t *p;
-
- if (!lenp) {
- lenp = &len;
- }
- p = qemu_fdt_getprop(fdt, node_path, property, lenp, errp);
- if (!p) {
- return 0;
- } else if (*lenp != 4) {
- error_setg(errp, "%s: %s/%s not 4 bytes long (not a cell?)",
- __func__, node_path, property);
- *lenp = -EINVAL;
- return 0;
- }
- return be32_to_cpu(*p);
-}
-
-uint32_t qemu_fdt_get_phandle(void *fdt, const char *path)
-{
- uint32_t r;
-
- r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));
- if (r == 0) {
- error_report("%s: Couldn't get phandle for %s: %s", __func__,
- path, fdt_strerror(r));
- exit(1);
- }
-
- return r;
-}
-
-int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
- const char *property,
- const char *target_node_path)
-{
- uint32_t phandle = qemu_fdt_get_phandle(fdt, target_node_path);
- return qemu_fdt_setprop_cell(fdt, node_path, property, phandle);
-}
-
-uint32_t qemu_fdt_alloc_phandle(void *fdt)
-{
- static int phandle = 0x0;
-
- /*
- * We need to find out if the user gave us special instruction at
- * which phandle id to start allocating phandles.
- */
- if (!phandle) {
- phandle = machine_phandle_start(current_machine);
- }
-
- if (!phandle) {
- /*
- * None or invalid phandle given on the command line, so fall back to
- * default starting point.
- */
- phandle = 0x8000;
- }
-
- return phandle++;
-}
-
-int qemu_fdt_nop_node(void *fdt, const char *node_path)
-{
- int r;
-
- r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path));
- if (r < 0) {
- error_report("%s: Couldn't nop node %s: %s", __func__, node_path,
- fdt_strerror(r));
- exit(1);
- }
-
- return r;
-}
-
-int qemu_fdt_add_subnode(void *fdt, const char *name)
-{
- char *dupname = g_strdup(name);
- char *basename = strrchr(dupname, '/');
- int retval;
- int parent = 0;
-
- if (!basename) {
- g_free(dupname);
- return -1;
- }
-
- basename[0] = '\0';
- basename++;
-
- if (dupname[0]) {
- parent = findnode_nofail(fdt, dupname);
- }
-
- retval = fdt_add_subnode(fdt, parent, basename);
- if (retval < 0) {
- error_report("FDT: Failed to create subnode %s: %s", name,
- fdt_strerror(retval));
- exit(1);
- }
-
- g_free(dupname);
- return retval;
-}
-
-void qemu_fdt_dumpdtb(void *fdt, int size)
-{
- const char *dumpdtb = qemu_opt_get(qemu_get_machine_opts(), "dumpdtb");
-
- if (dumpdtb) {
- /* Dump the dtb to a file and quit */
- exit(g_file_set_contents(dumpdtb, fdt, size, NULL) ? 0 : 1);
- }
-}
-
-int qemu_fdt_setprop_sized_cells_from_array(void *fdt,
- const char *node_path,
- const char *property,
- int numvalues,
- uint64_t *values)
-{
- uint32_t *propcells;
- uint64_t value;
- int cellnum, vnum, ncells;
- uint32_t hival;
- int ret;
-
- propcells = g_new0(uint32_t, numvalues * 2);
-
- cellnum = 0;
- for (vnum = 0; vnum < numvalues; vnum++) {
- ncells = values[vnum * 2];
- if (ncells != 1 && ncells != 2) {
- ret = -1;
- goto out;
- }
- value = values[vnum * 2 + 1];
- hival = cpu_to_be32(value >> 32);
- if (ncells > 1) {
- propcells[cellnum++] = hival;
- } else if (hival != 0) {
- ret = -1;
- goto out;
- }
- propcells[cellnum++] = cpu_to_be32(value);
- }
-
- ret = qemu_fdt_setprop(fdt, node_path, property, propcells,
- cellnum * sizeof(uint32_t));
-out:
- g_free(propcells);
- return ret;
-}
projects / mirror_qemu.git / blobdiff