--- /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 <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.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;
+}
+
+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;
+}
+
+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)
+{
+ int len;
+ const void *r;
+ if (!lenp) {
+ lenp = &len;
+ }
+ r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp);
+ if (!r) {
+ error_report("%s: Couldn't get %s/%s: %s", __func__,
+ node_path, property, fdt_strerror(*lenp));
+ exit(1);
+ }
+ return r;
+}
+
+uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path,
+ const char *property)
+{
+ int len;
+ const uint32_t *p = qemu_fdt_getprop(fdt, node_path, property, &len);
+ if (len != 4) {
+ error_report("%s: %s/%s not 4 bytes long (not a cell?)",
+ __func__, node_path, property);
+ exit(1);
+ }
+ 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;
+}
Code Review / kvmfornfv.git / blobdiff