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f2544d094b
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 <leah@libreboot.org>
69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
/* SPDX-License-Identifier: MIT
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* Copyright (c) 2022-2026 Leah Rowe <leah@libreboot.org>
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*
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* Manipulate Intel GbE NVM words, which are 16-bit little
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* endian in the files (MAC address words are big endian).
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <stddef.h>
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#include "../include/common.h"
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unsigned short
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nvm_word(size_t pos16, size_t p)
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{
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struct xstate *x = xstatus();
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struct xfile *f = &x->f;
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size_t pos;
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check_nvm_bound(pos16, p);
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pos = (pos16 << 1) + (p * GBE_PART_SIZE);
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return (unsigned short)f->buf[pos] |
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((unsigned short)f->buf[pos + 1] << 8);
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}
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void
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set_nvm_word(size_t pos16, size_t p, unsigned short val16)
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{
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struct xstate *x = xstatus();
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struct xfile *f = &x->f;
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size_t pos;
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check_nvm_bound(pos16, p);
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pos = (pos16 << 1) + (p * GBE_PART_SIZE);
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f->buf[pos] = (unsigned char)(val16 & 0xff);
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f->buf[pos + 1] = (unsigned char)(val16 >> 8);
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set_part_modified(p);
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}
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void
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set_part_modified(size_t p)
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{
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struct xstate *x = xstatus();
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struct xfile *f = &x->f;
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check_bin(p, "part number");
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f->part_modified[p] = 1;
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}
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void
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check_nvm_bound(size_t c, size_t p)
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{
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/* Block out of bound NVM access
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*/
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check_bin(p, "part number");
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if (c >= NVM_WORDS)
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err(ECANCELED, "check_nvm_bound: out of bounds %lu",
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(size_t)c);
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}
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