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/* SPDX-License-Identifier: MIT
*
* Copyright (c) 2022-2026 Leah Rowe <leah@libreboot.org>
*
* Manipulate sixteen-bit little-endian
* words on Intel GbE NVM configurations.
*/
#ifdef __OpenBSD__
#include <sys/param.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "../include/common.h"
/*
* GbE NVM files store 16-bit (2-byte) little-endian words.
* We must therefore swap the order when reading or writing.
*
* NOTE: The MAC address words are stored big-endian in the
* file, but we assume otherwise and adapt accordingly.
*/
unsigned short
nvm_word(unsigned long pos16, unsigned long p)
{
struct xstate *x = xstatus();
struct xfile *f;
unsigned long pos;
f = &x->f;
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();
struct xfile *f;
unsigned long pos;
f = &x->f;
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();
struct xfile *f;
f = &x->f;
check_bin(p, "part number");
f->part_modified[p] = 1;
}
void
check_nvm_bound(unsigned long c, unsigned long p)
{
/*
* NVM_SIZE assumed as the limit, because this
* current design assumes that we will only
* ever modified the NVM area.
*/
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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