From f2544d094ba88e1cfbb7993ad67444852cfd5efd Mon Sep 17 00:00:00 2001 From: Leah Rowe Date: Tue, 24 Mar 2026 00:28:15 +0000 Subject: util/mkhtemp: new utility (hardened mktemp) part of the same code library as nvmutil. as part of this, i renamed util/nvmutil to util/libreboot-utils/ because it is now a multi-utility codebase. this is more efficient, since i also wish to use mkhtemp (function) in nvmutil. Signed-off-by: Leah Rowe --- util/libreboot-utils/lib/word.c | 68 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 util/libreboot-utils/lib/word.c (limited to 'util/libreboot-utils/lib/word.c') diff --git a/util/libreboot-utils/lib/word.c b/util/libreboot-utils/lib/word.c new file mode 100644 index 00000000..f84dae6a --- /dev/null +++ b/util/libreboot-utils/lib/word.c @@ -0,0 +1,68 @@ +/* SPDX-License-Identifier: MIT + * Copyright (c) 2022-2026 Leah Rowe + * + * Manipulate Intel GbE NVM words, which are 16-bit little + * endian in the files (MAC address words are big endian). + */ + +#include + +#include +#include + +#include "../include/common.h" + +unsigned short +nvm_word(size_t pos16, size_t p) +{ + struct xstate *x = xstatus(); + struct xfile *f = &x->f; + + size_t pos; + + check_nvm_bound(pos16, p); + pos = (pos16 << 1) + (p * GBE_PART_SIZE); + + return (unsigned short)f->buf[pos] | + ((unsigned short)f->buf[pos + 1] << 8); +} + +void +set_nvm_word(size_t pos16, size_t p, unsigned short val16) +{ + struct xstate *x = xstatus(); + struct xfile *f = &x->f; + + size_t pos; + + check_nvm_bound(pos16, p); + pos = (pos16 << 1) + (p * GBE_PART_SIZE); + + f->buf[pos] = (unsigned char)(val16 & 0xff); + f->buf[pos + 1] = (unsigned char)(val16 >> 8); + + set_part_modified(p); +} + +void +set_part_modified(size_t p) +{ + struct xstate *x = xstatus(); + struct xfile *f = &x->f; + + check_bin(p, "part number"); + f->part_modified[p] = 1; +} + +void +check_nvm_bound(size_t c, size_t p) +{ + /* Block out of bound NVM access + */ + + check_bin(p, "part number"); + + if (c >= NVM_WORDS) + err(ECANCELED, "check_nvm_bound: out of bounds %lu", + (size_t)c); +} -- cgit v1.2.1