Annotation of qemu/device_tree.c, revision 1.1.1.4

1.1       root        1: /*
                      2:  * Functions to help device tree manipulation using libfdt.
                      3:  * It also provides functions to read entries from device tree proc
                      4:  * interface.
                      5:  *
                      6:  * Copyright 2008 IBM Corporation.
                      7:  * Authors: Jerone Young <jyoung5@us.ibm.com>
                      8:  *          Hollis Blanchard <hollisb@us.ibm.com>
                      9:  *
                     10:  * This work is licensed under the GNU GPL license version 2 or later.
                     11:  *
                     12:  */
                     13: 
                     14: #include <stdio.h>
                     15: #include <sys/types.h>
                     16: #include <sys/stat.h>
                     17: #include <fcntl.h>
                     18: #include <unistd.h>
                     19: #include <stdlib.h>
                     20: 
                     21: #include "config.h"
                     22: #include "qemu-common.h"
                     23: #include "device_tree.h"
1.1.1.3   root       24: #include "hw/loader.h"
1.1       root       25: 
                     26: #include <libfdt.h>
                     27: 
1.1.1.2   root       28: void *load_device_tree(const char *filename_path, int *sizep)
1.1       root       29: {
1.1.1.2   root       30:     int dt_size;
1.1       root       31:     int dt_file_load_size;
                     32:     int ret;
1.1.1.2   root       33:     void *fdt = NULL;
1.1       root       34: 
1.1.1.2   root       35:     *sizep = 0;
                     36:     dt_size = get_image_size(filename_path);
                     37:     if (dt_size < 0) {
1.1       root       38:         printf("Unable to get size of device tree file '%s'\n",
                     39:             filename_path);
                     40:         goto fail;
                     41:     }
                     42: 
1.1.1.2   root       43:     /* Expand to 2x size to give enough room for manipulation.  */
                     44:     dt_size *= 2;
1.1       root       45:     /* First allocate space in qemu for device tree */
1.1.1.2   root       46:     fdt = qemu_mallocz(dt_size);
1.1       root       47: 
1.1.1.2   root       48:     dt_file_load_size = load_image(filename_path, fdt);
                     49:     if (dt_file_load_size < 0) {
                     50:         printf("Unable to open device tree file '%s'\n",
                     51:                filename_path);
                     52:         goto fail;
                     53:     }
1.1       root       54: 
1.1.1.2   root       55:     ret = fdt_open_into(fdt, fdt, dt_size);
1.1       root       56:     if (ret) {
                     57:         printf("Unable to copy device tree in memory\n");
                     58:         goto fail;
                     59:     }
                     60: 
                     61:     /* Check sanity of device tree */
                     62:     if (fdt_check_header(fdt)) {
                     63:         printf ("Device tree file loaded into memory is invalid: %s\n",
                     64:             filename_path);
                     65:         goto fail;
                     66:     }
1.1.1.2   root       67:     *sizep = dt_size;
1.1       root       68:     return fdt;
                     69: 
                     70: fail:
1.1.1.2   root       71:     qemu_free(fdt);
1.1       root       72:     return NULL;
                     73: }
                     74: 
                     75: int qemu_devtree_setprop(void *fdt, const char *node_path,
1.1.1.4 ! root       76:                          const char *property, void *val_array, int size)
1.1       root       77: {
                     78:     int offset;
                     79: 
                     80:     offset = fdt_path_offset(fdt, node_path);
                     81:     if (offset < 0)
                     82:         return offset;
                     83: 
                     84:     return fdt_setprop(fdt, offset, property, val_array, size);
                     85: }
                     86: 
                     87: int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
                     88:                               const char *property, uint32_t val)
                     89: {
                     90:     int offset;
                     91: 
                     92:     offset = fdt_path_offset(fdt, node_path);
                     93:     if (offset < 0)
                     94:         return offset;
                     95: 
                     96:     return fdt_setprop_cell(fdt, offset, property, val);
                     97: }
                     98: 
                     99: int qemu_devtree_setprop_string(void *fdt, const char *node_path,
                    100:                                 const char *property, const char *string)
                    101: {
                    102:     int offset;
                    103: 
                    104:     offset = fdt_path_offset(fdt, node_path);
                    105:     if (offset < 0)
                    106:         return offset;
                    107: 
                    108:     return fdt_setprop_string(fdt, offset, property, string);
                    109: }

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