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/* SPDX-License-Identifier: MIT
* Copyright (c) 2022-2026 Leah Rowe <leah@libreboot.org>
*
* Manipulate Intel GbE NVM words, which are 16-bit little
* endian in the files (MAC address words are big endian).
*/
#include <sys/types.h>
#include <errno.h>
#include <stddef.h>
#include "../include/common.h"
unsigned short
nvm_word(unsigned long pos16, unsigned long p)
{
struct xstate *x = xstatus(0, NULL);
struct xfile *f = &x->f;
unsigned long 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(unsigned long pos16, unsigned long p, unsigned short val16)
{
struct xstate *x = xstatus(0, NULL);
struct xfile *f = &x->f;
unsigned long 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(unsigned long p)
{
struct xstate *x = xstatus(0, NULL);
struct xfile *f = &x->f;
check_bin(p, "part number");
f->part_modified[p] = 1;
}
void
check_nvm_bound(unsigned long c, unsigned long 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",
(unsigned long)c);
}
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