c3ad7615ff
Some ARC CPUs can be built with separate instruction bus and data bus (i.e. Harvard Architecture). Such systems have only ICCM and DCCM memories. When CONFIG_HARVARD is defined, the initial stack pointer is set to the TOP of the DCCM memory. Currently there is no SOC that existing in Zephyr tree that sets CONFIG_HARVARD, but this will be coming soon. Change-Id: I2016d1f472fbdad683a964aa0b65c5263ecfb6cf Signed-off-by: Chuck Jordan <cjordan@synopsys.com>
65 lines
1.6 KiB
ArmAsm
65 lines
1.6 KiB
ArmAsm
/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file
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* @brief Reset handler
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*
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* Reset handler that prepares the system for running C code.
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*/
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#define _ASMLANGUAGE
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// #include <board.h>
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#include <toolchain.h>
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#include <sections.h>
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#include <arch/cpu.h>
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#ifdef CONFIG_HARVARD
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#define _TOP_OF_MEMORY (CONFIG_DCCM_BASE_ADDRESS + CONFIG_DCCM_SIZE * 1024)
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/* harvard places the initial stack in the dccm memory */
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#else
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#define _TOP_OF_MEMORY (CONFIG_SRAM_BASE_ADDRESS + CONFIG_SRAM_SIZE * 1024)
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#endif
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GTEXT(__reset)
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GTEXT(__start)
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/**
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*
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* @brief Reset vector
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*
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* Ran when the system comes out of reset. The processor is at supervisor level.
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*
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* Locking interrupts prevents anything from interrupting the CPU.
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*
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* When these steps are completed, jump to _PrepC(), which will finish setting
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* up the system for running C code.
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*
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* @return N/A
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*/
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SECTION_FUNC(TEXT,__reset)
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SECTION_FUNC(TEXT,__start)
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/* lock interrupts: will get unlocked when switch to main task */
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clri
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/* setup a stack at the end of MEMORY */
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mov sp, _TOP_OF_MEMORY
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j @_PrepC
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