diff options
Diffstat (limited to 'scripts/dtc/libfdt/fdt_addresses.c')
-rw-r--r-- | scripts/dtc/libfdt/fdt_addresses.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/scripts/dtc/libfdt/fdt_addresses.c b/scripts/dtc/libfdt/fdt_addresses.c new file mode 100644 index 000000000..9a82cd0ba --- /dev/null +++ b/scripts/dtc/libfdt/fdt_addresses.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) +/* + * libfdt - Flat Device Tree manipulation + * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au> + * Copyright (C) 2018 embedded brains GmbH + */ +#include "libfdt_env.h" + +#include <fdt.h> +#include <libfdt.h> + +#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)); +} |