100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
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// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
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/*
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* libfdt - Flat Device Tree manipulation
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* Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
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* Copyright (C) 2018 embedded brains GmbH
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*/
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#include "libfdt_env.h"
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#include <fdt.h>
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#include <libfdt.h>
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#include "libfdt_internal.h"
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static int fdt_cells(const void *fdt, int nodeoffset, const char *name)
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{
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const fdt32_t *c;
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int val;
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int len;
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c = fdt_getprop(fdt, nodeoffset, name, &len);
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if (!c)
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return len;
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if (len != sizeof(*c))
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return -FDT_ERR_BADNCELLS;
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val = fdt32_to_cpu(*c);
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if ((val <= 0) || (val > FDT_MAX_NCELLS))
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return -FDT_ERR_BADNCELLS;
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return val;
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}
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int fdt_address_cells(const void *fdt, int nodeoffset)
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{
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int val;
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val = fdt_cells(fdt, nodeoffset, "#address-cells");
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if (val == -FDT_ERR_NOTFOUND)
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return 2;
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return val;
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}
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int fdt_size_cells(const void *fdt, int nodeoffset)
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{
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int val;
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val = fdt_cells(fdt, nodeoffset, "#size-cells");
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if (val == -FDT_ERR_NOTFOUND)
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return 1;
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return val;
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}
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/* This function assumes that [address|size]_cells is 1 or 2 */
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int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
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const char *name, uint64_t addr, uint64_t size)
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{
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int addr_cells, size_cells, ret;
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uint8_t data[sizeof(fdt64_t) * 2], *prop;
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ret = fdt_address_cells(fdt, parent);
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if (ret < 0)
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return ret;
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addr_cells = ret;
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ret = fdt_size_cells(fdt, parent);
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if (ret < 0)
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return ret;
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size_cells = ret;
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/* check validity of address */
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prop = data;
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if (addr_cells == 1) {
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if ((addr > UINT32_MAX) || ((UINT32_MAX + 1 - addr) < size))
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return -FDT_ERR_BADVALUE;
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fdt32_st(prop, (uint32_t)addr);
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} else if (addr_cells == 2) {
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fdt64_st(prop, addr);
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} else {
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return -FDT_ERR_BADNCELLS;
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}
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/* check validity of size */
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prop += addr_cells * sizeof(fdt32_t);
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if (size_cells == 1) {
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if (size > UINT32_MAX)
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return -FDT_ERR_BADVALUE;
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fdt32_st(prop, (uint32_t)size);
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} else if (size_cells == 2) {
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fdt64_st(prop, size);
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} else {
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return -FDT_ERR_BADNCELLS;
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}
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return fdt_appendprop(fdt, nodeoffset, name, data,
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(addr_cells + size_cells) * sizeof(fdt32_t));
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}
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