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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2011 The ChromiumOS Authors. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef ARCH_EARLY_VARIABLES_H
#define ARCH_EARLY_VARIABLES_H
#include <arch/symbols.h>
#include <stdlib.h>
#include <rules.h>
#if ENV_CACHE_AS_RAM && !IS_ENABLED(CONFIG_NO_CAR_GLOBAL_MIGRATION)
asm(".section .car.global_data,\"w\",@nobits");
asm(".previous");
#ifdef __clang__
#define CAR_GLOBAL __attribute__((used, section(".car.global_data")))
#else
#define CAR_GLOBAL __attribute__((used, section(".car.global_data#")))
#endif /* __clang__ */
/*
* In stages that use CAR (verstage, C bootblock) all CAR_GLOBAL variables are
* accessed unconditionally because cbmem is never initialized until romstage
* when dram comes up.
*/
#if !ENV_ROMSTAGE
static inline void *car_get_var_ptr(void *var)
{
return var;
}
static inline void *car_sync_var_ptr(void *var)
{
return var;
}
static inline int car_active(void)
{
return 1;
}
#else
/* Get the correct pointer for the CAR global variable. */
void *car_get_var_ptr(void *var);
/* Get and update a CAR_GLOBAL pointing elsewhere in car.global_data*/
void *car_sync_var_ptr(void *var);
/* Return 1 when currently running with globals in Cache-as-RAM, 0 otherwise. */
int car_active(void);
#endif /* !ENV_ROMSTAGE */
/* Get and set a primitive type global variable. */
#define car_get_var(var) \
(*(typeof(var) *)car_get_var_ptr(&(var)))
#define car_sync_var(var) \
(*(typeof(var) *)car_sync_var_ptr(&(var)))
#define car_set_var(var, val) car_get_var(var) = (val)
static inline size_t car_data_size(void)
{
size_t car_size = _car_relocatable_data_size;
return ALIGN(car_size, 64);
}
static inline size_t car_object_offset(void *ptr)
{
return (char *)ptr - &_car_relocatable_data_start[0];
}
#else
/*
* We might end up here if:
* 1. ENV_CACHE_AS_RAM is not set for the stage or
* 2. ENV_CACHE_AS_RAM is set for the stage but CONFIG_NO_CAR_GLOBAL_MIGRATION
* is also set. In this case, there is no need to migrate CAR global
* variables. But, since we might still be running out of CAR, car_active needs
* to return 1 if ENV_CACHE_AS_RAM is set.
*/
#define CAR_GLOBAL
static inline void *car_get_var_ptr(void *var) { return var; }
#if ENV_CACHE_AS_RAM
static inline int car_active(void) { return 1; }
#else
static inline int car_active(void) { return 0; }
#endif /* ENV_CACHE_AS_RAM */
#define car_get_var(var) (var)
#define car_sync_var(var) (var)
#define car_set_var(var, val) (var) = (val)
#endif /* ENV_CACHE_AS_RAM && !IS_ENABLED(CONFIG_NO_CAR_GLOBAL_MIGRATION) */
#endif /* ARCH_EARLY_VARIABLES_H */
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