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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "config.h"
#include "ec_commands.h"
#include "sysjump.h"
#include "system.h"
#include <sys/util.h>
#include <string.h>
#include <errno.h>
/* Ongoing actions preventing going into deep-sleep mode. */
uint32_t sleep_mask;
/* Round up to a multiple of 4. */
#define ROUNDUP4(x) (((x) + 3) & ~3)
/** Data for an individual jump tag. */
struct jump_tag {
/** Tag ID. */
uint16_t tag;
/** Size of the data which follows. */
uint8_t data_size;
/** Version of the data. */
uint8_t data_version;
/* Followed by data_size bytes of data. */
};
/** Jump data (at end of RAM, or preceding panic data). */
static struct jump_data *jdata;
/**
* The flags set by the reset cause. These will be a combination of
* EC_RESET_FLAG_*s and will be used to control the logic of initializing the
* system image.
*/
static uint32_t reset_flags;
/** Whether or not we've successfully loaded/jumped the current image. */
static bool jumped_to_image;
/* static void jump_to_image */
/* TODO(b/171407461) implement components/panic */
static uintptr_t get_panic_data_start(void)
{
return 0;
}
void system_common_pre_init(void)
{
/* TODO check for watchdog reset. */
/*
* In testing we will override the jdata address via
* system_override_jdata.
*/
if (!IS_ENABLED(CONFIG_ZTEST)) {
uintptr_t addr = get_panic_data_start();
if (!addr)
addr = CONFIG_CROS_EC_RAM_BASE +
CONFIG_CROS_EC_RAM_SIZE;
jdata = (struct jump_data *)(addr - sizeof(struct jump_data));
}
/* Check jump data if this is a jump between images. */
if (jdata->magic == JUMP_DATA_MAGIC && jdata->version >= 1) {
/*
* Change in jump data struct size between the previous image
* and this one.
*/
int delta;
/* Set the flag so others know we jumped. */
jumped_to_image = true;
/* Restore the reset_flags. */
reset_flags = jdata->reset_flags | EC_RESET_FLAG_SYSJUMP;
/*
* If the jump data structure isn't the same size as the
* current one, shift the jump tags to immediately before the
* current jump data structure, to make room for initializing
* the new fields below.
*/
delta = sizeof(struct jump_data) - jdata->struct_size;
if (delta && jdata->jump_tag_total) {
uint8_t *d = (uint8_t *)system_usable_ram_end();
memmove(d, d + delta, jdata->jump_tag_total);
}
jdata->jump_tag_total = 0;
jdata->reserved0 = 0;
/* Struct size is now the current struct size */
jdata->struct_size = sizeof(struct jump_data);
/*
* Clear the jump struct's magic number. This prevents
* accidentally detecting a jump when there wasn't one, and
* disallows use of system_add_jump_tag().
*/
jdata->magic = 0;
} else {
memset(jdata, 0, sizeof(struct jump_data));
}
}
uintptr_t system_usable_ram_end(void)
{
return (uintptr_t)jdata - jdata->jump_tag_total;
}
int system_add_jump_tag(uint16_t tag, int version, int size, const void *data)
{
struct jump_tag *t;
/* Only allowed during a sysjump. */
if (!jdata || jdata->magic != JUMP_DATA_MAGIC)
return -EINVAL;
/* Make room for the new tag. */
if (size < 0 || size > 0xff)
return -EINVAL;
jdata->jump_tag_total += ROUNDUP4(size) + sizeof(struct jump_tag);
t = (struct jump_tag *)system_usable_ram_end();
t->tag = tag;
t->data_size = size;
t->data_version = version;
if (size)
memcpy(t + 1, data, size);
return 0;
}
const uint8_t *system_get_jump_tag(uint16_t tag, int *version, int *size)
{
const struct jump_tag *t;
int used = 0;
if (!jdata)
return NULL;
/* Search through tag data for a match. */
while (used < jdata->jump_tag_total) {
/* Check the next tag. */
t = (const struct jump_tag *)(system_usable_ram_end() + used);
used += sizeof(struct jump_tag) + ROUNDUP4(t->data_size);
if (t->tag != tag)
continue;
/* Found a match. */
if (size)
*size = t->data_size;
if (version)
*version = t->data_version;
return (const uint8_t *)(t + 1);
}
/* If we got here, there was no match. */
return NULL;
}
void system_encode_save_flags(int reset_flags, uint32_t *save_flags)
{
*save_flags = 0;
/* Save current reset reasons if necessary. */
if (reset_flags & SYSTEM_RESET_PRESERVE_FLAGS)
*save_flags = system_get_reset_flags() |
EC_RESET_FLAG_PRESERVED;
/* Add in AP off flag into saved flags. */
if (reset_flags & SYSTEM_RESET_LEAVE_AP_OFF)
*save_flags |= EC_RESET_FLAG_AP_OFF;
/* Add in stay in RO flag into saved flags. */
if (reset_flags & SYSTEM_RESET_STAY_IN_RO)
*save_flags |= EC_RESET_FLAG_STAY_IN_RO;
/* Save reset flag. */
if (reset_flags & (SYSTEM_RESET_HARD | SYSTEM_RESET_WAIT_EXT))
*save_flags |= EC_RESET_FLAG_HARD;
else
*save_flags |= EC_RESET_FLAG_SOFT;
}
uint32_t system_get_reset_flags(void)
{
return reset_flags;
}
void system_set_reset_flags(uint32_t flags)
{
reset_flags |= flags;
}
void system_clear_reset_flags(uint32_t flags)
{
reset_flags &= ~flags;
}
__test_only void system_common_reset_state(void)
{
jdata = 0;
reset_flags = 0;
jumped_to_image = false;
}
__test_only void system_override_jdata(void *test_jdata)
{
jdata = (struct jump_data *)test_jdata;
}
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