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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* Copyright (C) 2023, Ferass El Hafidi <vitali64pmemail@protonmail.com>
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <err.h>
#include <stdlib.h>
#include "acsbaby.h"
#include "parse.h"
#include "timing.h"
acs_t parse_acs_footer(const int fildes, const uint16_t acs_offset) {
acs_t acs_footer;
unsigned char buffer[16];
/* Seek to the ACS footer */
if (lseek(fildes, acs_offset, SEEK_SET) == -1)
err(errno, "%s", "can't seek to ACS footer");
/* Read an entry */
if (read(fildes, &buffer, 16) == -1) /* Each entry is 16 bytes long */
err(errno, "%s", "can't read ACS footer");
/* Check for the "acs__" magic word */
if (strncmp((char *)buffer, "acs__", 5))
errx(EINVAL, "%s", "invalid file");
/* Parse the "acs__" entry */
acs_footer.chip_type = (uint8_t)buffer[5];
/*
* The version is actually 2 bytes long but since it's never going to
* exceed 1 byte we just parse 1 byte.
*/
acs_footer.version = (uint8_t)buffer[6];
acs_footer.size = (uint16_t)((buffer[8] << 2) + buffer[9]);
/* Read all other entries */
for (int i = 1; i <= 3; i++) {
/* Seek to the next entry */
if (lseek(fildes, acs_offset + i * 0x10, SEEK_SET) == -1)
err(errno, "%s", "can't seek to next ACS entry");
if (read(fildes, &buffer, 16) == -1)
err(errno, "%s", "can't read ACS entry");
/*
* This is where we hit into complex bitwise usage.
* That's normal; we're just parsing addresses and sizes as
* `uint16_t`s and `uint32_t`s but the acs.bin is little
* endian (which means that the bytes are stored in
* reverse-byte sequence) so we need to reverse back to have
* the right byte sequence.
*/
if (!strncmp((char *)buffer, "ddrs_", 5)) {
acs_footer.ddrs.version = (uint8_t)buffer[5];
acs_footer.ddrs.size = (uint16_t)((buffer[7] << 8)
+ buffer[6]);
acs_footer.ddrs.address = (uint32_t)((((buffer[11] << 8) +
buffer[10]) << 16) +
((buffer[9] << 8) + buffer[8]));
}
else if (!strncmp((char *)buffer, "ddrt_", 5)) {
acs_footer.ddrt.version = (uint8_t)buffer[5];
acs_footer.ddrt.size = (uint16_t)((buffer[7] << 8)
+ buffer[6]);
acs_footer.ddrt.address = (uint32_t)(((
(buffer[11] << 8) + buffer[10]) << 16) +
((buffer[9] << 8) + buffer[8]));
}
else if (!strncmp((char *)buffer, "pll__", 5)) {
acs_footer.pll.version = (uint8_t)buffer[5];
acs_footer.pll.size = (uint16_t)((buffer[7] << 8) |
(buffer[6] & 0xFF));
acs_footer.pll.address = (uint32_t)((((buffer[11] << 8)
+ buffer[10]) << 16) + ((buffer[9] << 8) +
buffer[8]));
}
else errx(EINVAL, "%s", "no valid ACS entry found");
}
return acs_footer;
}
ddrs_t parse_ddrs(const int fildes, const acs_t acs_footer,
const uint16_t diff_offset) {
uint16_t offset = acs_footer.ddrs.address - diff_offset;
ddrs_t ddr_settings;
/* Seek to the ddrs_ structure */
if (lseek(fildes, offset, SEEK_SET) == -1)
err(errno, "%s", "can't seek to ddrs_ structure");
/* Read */
read(fildes, &ddr_settings, acs_footer.ddrs.size);
return ddr_settings;
}
void parse_ddrt(const int fildes, const acs_t acs_footer,
const uint16_t diff_offset, ddrt_t ddr_timings[7]) {
uint16_t offset = acs_footer.ddrt.address - diff_offset;
/* Seek to the ddrt_ structure */
if (lseek(fildes, offset, SEEK_SET) == -1)
err(errno, "%s", "can't seek to ddrt_ structure");
/* Read */
for (int i = 0; i < 7; i++) {
read(fildes, &ddr_timings[i], acs_footer.ddrt.size / 7);
}
}
pll_t parse_pll(const int fildes, const acs_t acs_footer,
const uint16_t diff_offset) {
uint16_t offset = acs_footer.pll.address - diff_offset;
pll_t pll_settings;
/* Seek to the ddrt_ structure */
if (lseek(fildes, offset, SEEK_SET) == -1)
err(errno, "%s", "can't seek to pll__ structure");
read(fildes, &pll_settings, acs_footer.pll.size);
return pll_settings;
}
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