Linux preempt-rt

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/*
 * Copyright (c) 2014 Wind River Systems, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @file
 * @brief Reset handler
 *
 * Reset handler that prepares the system for running C code.
 */

#define _ASMLANGUAGE

// #include <board.h>
#include <toolchain.h>
#include <sections.h>
#include <arch/cpu.h>

#ifdef CONFIG_HARVARD
#define _TOP_OF_MEMORY (CONFIG_DCCM_BASE_ADDRESS + CONFIG_DCCM_SIZE * 1024)
/* harvard places the initial stack in the dccm memory */
#else
#define _TOP_OF_MEMORY (CONFIG_SRAM_BASE_ADDRESS + CONFIG_SRAM_SIZE * 1024)
#endif

GTEXT(__reset)
GTEXT(__start)

/**
 *
 * @brief Reset vector
 *
 * Ran when the system comes out of reset. The processor is at supervisor level.
 *
 * Locking interrupts prevents anything from interrupting the CPU.
 *
 * When these steps are completed, jump to _PrepC(), which will finish setting
 * up the system for running C code.
 *
 * @return N/A
 */

SECTION_FUNC(TEXT,__reset)
SECTION_FUNC(TEXT,__start)

	/* lock interrupts: will get unlocked when switch to main task */
	clri

	/* setup a stack at the end of MEMORY */
	mov sp, _TOP_OF_MEMORY

	j @_PrepC