/* $NetBSD: fdt_addresses.c,v 1.1.1.3 2019/12/22 12:30:37 skrll Exp $ */ // SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) /* * libfdt - Flat Device Tree manipulation * Copyright (C) 2014 David Gibson * Copyright (C) 2018 embedded brains GmbH */ #include "libfdt_env.h" #include #include #include "libfdt_internal.h" static int fdt_cells(const void *fdt, int nodeoffset, const char *name) { const fdt32_t *c; uint32_t val; int len; c = fdt_getprop(fdt, nodeoffset, name, &len); if (!c) return len; if (len != sizeof(*c)) return -FDT_ERR_BADNCELLS; val = fdt32_to_cpu(*c); if (val > FDT_MAX_NCELLS) return -FDT_ERR_BADNCELLS; return (int)val; } int fdt_address_cells(const void *fdt, int nodeoffset) { int val; val = fdt_cells(fdt, nodeoffset, "#address-cells"); if (val == 0) return -FDT_ERR_BADNCELLS; if (val == -FDT_ERR_NOTFOUND) return 2; return val; } int fdt_size_cells(const void *fdt, int nodeoffset) { int val; val = fdt_cells(fdt, nodeoffset, "#size-cells"); if (val == -FDT_ERR_NOTFOUND) return 1; return val; } /* This function assumes that [address|size]_cells is 1 or 2 */ int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset, const char *name, uint64_t addr, uint64_t size) { int addr_cells, size_cells, ret; uint8_t data[sizeof(fdt64_t) * 2], *prop; ret = fdt_address_cells(fdt, parent); if (ret < 0) return ret; addr_cells = ret; ret = fdt_size_cells(fdt, parent); if (ret < 0) return ret; size_cells = ret; /* check validity of address */ prop = data; if (addr_cells == 1) { if ((addr > UINT32_MAX) || ((UINT32_MAX + 1 - addr) < size)) return -FDT_ERR_BADVALUE; fdt32_st(prop, (uint32_t)addr); } else if (addr_cells == 2) { fdt64_st(prop, addr); } else { return -FDT_ERR_BADNCELLS; } /* check validity of size */ prop += addr_cells * sizeof(fdt32_t); if (size_cells == 1) { if (size > UINT32_MAX) return -FDT_ERR_BADVALUE; fdt32_st(prop, (uint32_t)size); } else if (size_cells == 2) { fdt64_st(prop, size); } else { return -FDT_ERR_BADNCELLS; } return fdt_appendprop(fdt, nodeoffset, name, data, (addr_cells + size_cells) * sizeof(fdt32_t)); }