dtc/libfdt/fdt_addresses.c

0001 // SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
0002 /*
0003  * libfdt - Flat Device Tree manipulation
0004  * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
0005  * Copyright (C) 2018 embedded brains GmbH
0006  */
0007 #include "libfdt_env.h"
0008
0009 #include <fdt.h>
0010 #include <libfdt.h>
0011
0012 #include "libfdt_internal.h"
0013
0014 static int fdt_cells(const void *fdt, int nodeoffset, const char *name)
0015 {
0016     const fdt32_t *c;
0017     uint32_t val;
0018     int len;
0019
0020     c = fdt_getprop(fdt, nodeoffset, name, &len);
0021     if (!c)
0022         return len;
0023
0024     if (len != sizeof(*c))
0025         return -FDT_ERR_BADNCELLS;
0026
0027     val = fdt32_to_cpu(*c);
0028     if (val > FDT_MAX_NCELLS)
0029         return -FDT_ERR_BADNCELLS;
0030
0031     return (int)val;
0032 }
0033
0034 int fdt_address_cells(const void *fdt, int nodeoffset)
0035 {
0036     int val;
0037
0038     val = fdt_cells(fdt, nodeoffset, "#address-cells");
0039     if (val == 0)
0040         return -FDT_ERR_BADNCELLS;
0041     if (val == -FDT_ERR_NOTFOUND)
0042         return 2;
0043     return val;
0044 }
0045
0046 int fdt_size_cells(const void *fdt, int nodeoffset)
0047 {
0048     int val;
0049
0050     val = fdt_cells(fdt, nodeoffset, "#size-cells");
0051     if (val == -FDT_ERR_NOTFOUND)
0052         return 1;
0053     return val;
0054 }
0055
0056 /* This function assumes that [address|size]_cells is 1 or 2 */
0057 int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
0058                  const char *name, uint64_t addr, uint64_t size)
0059 {
0060     int addr_cells, size_cells, ret;
0061     uint8_t data[sizeof(fdt64_t) * 2], *prop;
0062
0063     ret = fdt_address_cells(fdt, parent);
0064     if (ret < 0)
0065         return ret;
0066     addr_cells = ret;
0067
0068     ret = fdt_size_cells(fdt, parent);
0069     if (ret < 0)
0070         return ret;
0071     size_cells = ret;
0072
0073     /* check validity of address */
0074     prop = data;
0075     if (addr_cells == 1) {
0076         if ((addr > UINT32_MAX) || ((UINT32_MAX + 1 - addr) < size))
0077             return -FDT_ERR_BADVALUE;
0078
0079         fdt32_st(prop, (uint32_t)addr);
0080     } else if (addr_cells == 2) {
0081         fdt64_st(prop, addr);
0082     } else {
0083         return -FDT_ERR_BADNCELLS;
0084     }
0085
0086     /* check validity of size */
0087     prop += addr_cells * sizeof(fdt32_t);
0088     if (size_cells == 1) {
0089         if (size > UINT32_MAX)
0090             return -FDT_ERR_BADVALUE;
0091
0092         fdt32_st(prop, (uint32_t)size);
0093     } else if (size_cells == 2) {
0094         fdt64_st(prop, size);
0095     } else {
0096         return -FDT_ERR_BADNCELLS;
0097     }
0098
0099     return fdt_appendprop(fdt, nodeoffset, name, data,
0100                   (addr_cells + size_cells) * sizeof(fdt32_t));
0101 }