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/* Copyright 2013 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.
*/
/* Flash module for emulator */
#include <stdio.h>
#include "common.h"
#include "config_chip.h"
#include "flash.h"
#include "persistence.h"
#include "util.h"
/* This needs to be aligned to the erase bank size for NVCTR. */
__aligned(CONFIG_FLASH_ERASE_SIZE) char __host_flash[CONFIG_FLASH_SIZE_BYTES];
uint8_t __host_flash_protect[PHYSICAL_BANKS];
/* Override this function to make flash erase/write operation fail */
test_mockable int flash_pre_op(void)
{
return EC_SUCCESS;
}
static int flash_check_protect(int offset, int size)
{
int first_bank = offset / CONFIG_FLASH_BANK_SIZE;
int last_bank = DIV_ROUND_UP(offset + size,
CONFIG_FLASH_BANK_SIZE);
int bank;
for (bank = first_bank; bank < last_bank; ++bank)
if (__host_flash_protect[bank])
return 1;
return 0;
}
static void flash_set_persistent(void)
{
FILE *f = get_persistent_storage("flash", "wb");
int sz;
ASSERT(f != NULL);
sz = fwrite(__host_flash, sizeof(__host_flash), 1, f);
ASSERT(sz == 1);
release_persistent_storage(f);
}
static void flash_get_persistent(void)
{
FILE *f = get_persistent_storage("flash", "rb");
int sz;
if (f == NULL) {
fprintf(stderr,
"No flash storage found. Initializing to 0xff.\n");
memset(__host_flash, 0xff, sizeof(__host_flash));
return;
}
sz = fread(__host_flash, sizeof(__host_flash), 1, f);
ASSERT(sz == 1);
release_persistent_storage(f);
}
int crec_flash_physical_write(int offset, int size, const char *data)
{
ASSERT((size & (CONFIG_FLASH_WRITE_SIZE - 1)) == 0);
if (flash_pre_op() != EC_SUCCESS)
return EC_ERROR_UNKNOWN;
if (flash_check_protect(offset, size))
return EC_ERROR_ACCESS_DENIED;
memcpy(__host_flash + offset, data, size);
flash_set_persistent();
return EC_SUCCESS;
}
int crec_flash_physical_erase(int offset, int size)
{
ASSERT((size & (CONFIG_FLASH_ERASE_SIZE - 1)) == 0);
if (flash_pre_op() != EC_SUCCESS)
return EC_ERROR_UNKNOWN;
if (flash_check_protect(offset, size))
return EC_ERROR_ACCESS_DENIED;
memset(__host_flash + offset, 0xff, size);
flash_set_persistent();
return EC_SUCCESS;
}
int crec_flash_physical_get_protect(int bank)
{
return __host_flash_protect[bank];
}
uint32_t crec_flash_physical_get_protect_flags(void)
{
int i;
uint32_t flags = EC_FLASH_PROTECT_ALL_NOW;
for (i = 0; i < PHYSICAL_BANKS; ++i)
if (__host_flash_protect[i] == 0)
flags = 0;
return flags;
}
int crec_flash_physical_protect_now(int all)
{
memset(__host_flash_protect, 1, all ? PHYSICAL_BANKS : WP_BANK_COUNT);
return EC_SUCCESS;
}
uint32_t crec_flash_physical_get_valid_flags(void)
{
return EC_FLASH_PROTECT_RO_AT_BOOT |
EC_FLASH_PROTECT_RO_NOW |
EC_FLASH_PROTECT_ALL_NOW;
}
uint32_t crec_flash_physical_get_writable_flags(uint32_t cur_flags)
{
uint32_t ret = 0;
/* If RO protection isn't enabled, its at-boot state can be changed. */
if (!(cur_flags & EC_FLASH_PROTECT_RO_NOW))
ret |= EC_FLASH_PROTECT_RO_AT_BOOT;
/*
* If entire flash isn't protected at this boot, it can be enabled if
* the WP GPIO is asserted.
*/
if (!(cur_flags & EC_FLASH_PROTECT_ALL_NOW) &&
(cur_flags & EC_FLASH_PROTECT_GPIO_ASSERTED))
ret |= EC_FLASH_PROTECT_ALL_NOW;
return ret;
}
int crec_flash_pre_init(void)
{
uint32_t prot_flags;
flash_get_persistent();
prot_flags = crec_flash_get_protect();
if (prot_flags & EC_FLASH_PROTECT_GPIO_ASSERTED) {
/*
* Write protect is asserted. If we want RO flash protected,
* protect it now.
*/
if ((prot_flags & EC_FLASH_PROTECT_RO_AT_BOOT) &&
!(prot_flags & EC_FLASH_PROTECT_RO_NOW)) {
int rv = crec_flash_set_protect(EC_FLASH_PROTECT_RO_NOW,
EC_FLASH_PROTECT_RO_NOW);
if (rv)
return rv;
/* Re-read flags */
prot_flags = crec_flash_get_protect();
}
}
return EC_SUCCESS;
}
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