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/* Copyright 2020 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Init ROM module for Chrome EC */
#include "builtin/assert.h"
#include "common.h"
#include "init_rom.h"
#include "flash.h"
#include "stdbool.h"
#include "stddef.h"
const void *init_rom_map(const void *addr, int size)
{
const char *src;
uintptr_t offset;
/*
* When CONFIG_CHIP_INIT_ROM_REGION isn't enabled, .init_rom objects
* are linked into the .rodata section and directly addressable.
* Return the caller's pointer.
*/
if (!IS_ENABLED(CONFIG_CHIP_INIT_ROM_REGION))
return addr;
/*
* When flash isn't memory mapped, caller's must use init_rom_copy()
* to copy .init_rom data into RAM.
*/
if (!IS_ENABLED(CONFIG_MAPPED_STORAGE))
return NULL;
/*
* Safe pointer conversion - needed for host tests which can have
* 64-bit pointers.
*/
offset = (uintptr_t)addr;
ASSERT(offset <= __INT_MAX__);
/*
* Convert flash offset to memory mapped address
*/
if (crec_flash_dataptr((int)offset, size, 1, &src) < 0)
return NULL;
/* Once the flash offset is validated, lock the flash for the caller */
crec_flash_lock_mapped_storage(1);
return src;
}
/*
* The addr and size parameters are provided for forward compatibility if
* the flash API is extended to support locking less than the entire flash.
*/
void init_rom_unmap(const void *addr, int size)
{
if (IS_ENABLED(CONFIG_CHIP_INIT_ROM_REGION))
crec_flash_lock_mapped_storage(0);
}
int init_rom_copy(int offset, int size, char *data)
{
return crec_flash_read(offset, size, data);
}
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