/* * 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 "config.h" #include "qemu-common.h" #include "device_tree.h" #include "hw/loader.h" #include "qemu-option.h" #include "qemu-config.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_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) { fprintf(stderr, "Unable to copy device tree in memory\n"); exit(1); } return fdt; fail: fprintf(stderr, "%s Couldn't create dt: %s\n", __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) { printf("Unable to get size of device tree file '%s'\n", 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) { printf("Unable to open device tree file '%s'\n", filename_path); goto fail; } ret = fdt_open_into(fdt, fdt, 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; } *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) { fprintf(stderr, "%s Couldn't find node %s: %s\n", __func__, node_path, fdt_strerror(offset)); exit(1); } return offset; } int qemu_devtree_setprop(void *fdt, const char *node_path, const char *property, const void *val_array, int size) { int r; r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val_array, size); if (r < 0) { fprintf(stderr, "%s: Couldn't set %s/%s: %s\n", __func__, node_path, property, fdt_strerror(r)); exit(1); } return r; } int qemu_devtree_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) { fprintf(stderr, "%s: Couldn't set %s/%s = %#08x: %s\n", __func__, node_path, property, val, fdt_strerror(r)); exit(1); } return r; } int qemu_devtree_setprop_u64(void *fdt, const char *node_path, const char *property, uint64_t val) { val = cpu_to_be64(val); return qemu_devtree_setprop(fdt, node_path, property, &val, sizeof(val)); } int qemu_devtree_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) { fprintf(stderr, "%s: Couldn't set %s/%s = %s: %s\n", __func__, node_path, property, string, fdt_strerror(r)); exit(1); } return r; } const void *qemu_devtree_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) { fprintf(stderr, "%s: Couldn't get %s/%s: %s\n", __func__, node_path, property, fdt_strerror(*lenp)); exit(1); } return r; } uint32_t qemu_devtree_getprop_cell(void *fdt, const char *node_path, const char *property) { int len; const uint32_t *p = qemu_devtree_getprop(fdt, node_path, property, &len); if (len != 4) { fprintf(stderr, "%s: %s/%s not 4 bytes long (not a cell?)\n", __func__, node_path, property); exit(1); } return be32_to_cpu(*p); } uint32_t qemu_devtree_get_phandle(void *fdt, const char *path) { uint32_t r; r = fdt_get_phandle(fdt, findnode_nofail(fdt, path)); if (r <= 0) { fprintf(stderr, "%s: Couldn't get phandle for %s: %s\n", __func__, path, fdt_strerror(r)); exit(1); } return r; } int qemu_devtree_setprop_phandle(void *fdt, const char *node_path, const char *property, const char *target_node_path) { uint32_t phandle = qemu_devtree_get_phandle(fdt, target_node_path); return qemu_devtree_setprop_cell(fdt, node_path, property, phandle); } uint32_t qemu_devtree_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 allocting phandles. */ if (!phandle) { QemuOpts *machine_opts; machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0); if (machine_opts) { const char *phandle_start; phandle_start = qemu_opt_get(machine_opts, "phandle_start"); if (phandle_start) { phandle = strtoul(phandle_start, NULL, 0); } } } if (!phandle) { /* * None or invalid phandle given on the command line, so fall back to * default starting point. */ phandle = 0x8000; } return phandle++; } int qemu_devtree_nop_node(void *fdt, const char *node_path) { int r; r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path)); if (r < 0) { fprintf(stderr, "%s: Couldn't nop node %s: %s\n", __func__, node_path, fdt_strerror(r)); exit(1); } return r; } int qemu_devtree_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) { fprintf(stderr, "FDT: Failed to create subnode %s: %s\n", name, fdt_strerror(retval)); exit(1); } g_free(dupname); return retval; }