94 lines
2.7 KiB
ArmAsm
94 lines
2.7 KiB
ArmAsm
/*
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* Copyright (c) 2016 Intel Corporation.
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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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#define _ASMLANGUAGE
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#include <arch/x86/asm.h>
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#ifdef CONFIG_SYS_POWER_DEEP_SLEEP
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GDATA(_pm_save_gdtr)
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GDATA(_pm_save_idtr)
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GDATA(_pm_save_esp)
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GTEXT(_sys_soc_resume_from_deep_sleep)
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GTEXT(_power_restore_cpu_context)
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GTEXT(_power_soc_sleep)
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GTEXT(_power_soc_deep_sleep)
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SECTION_FUNC(TEXT, save_cpu_context)
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movl %esp, %eax /* save ptr to return address */
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pushf /* save flags */
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pusha /* save GPRs */
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movl %esp, _pm_save_esp /* save stack ptr */
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sidtl _pm_save_idtr /* save idtr */
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sgdtl _pm_save_gdtr /* save gdtr */
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pushl (%eax) /* push return address */
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ret
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SECTION_FUNC(TEXT, _power_restore_cpu_context)
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lgdtl _pm_save_gdtr /* restore gdtr */
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lidtl _pm_save_idtr /* restore idtr */
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movl _pm_save_esp, %esp /* restore saved stack ptr */
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popa /* restore saved GPRs */
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popf /* restore saved flags */
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/*
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* At this point the stack contents will be as follows:
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*
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* Saved context
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* ESP ---> Return address of save_cpu_context
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* Return address of _power_soc_sleep/deep_sleep
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*
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* We just popped the saved context. Next we pop out the address
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* of the caller of save_cpu_context.Then the ret would return
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* to caller of _power_soc_sleep or _power_soc_deep_sleep.
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*
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*/
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addl $4, %esp
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ret
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SECTION_FUNC(TEXT, _power_soc_sleep)
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call save_cpu_context
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wbinvd
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call power_soc_sleep
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/* Does not return */
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SECTION_FUNC(TEXT, _power_soc_deep_sleep)
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call save_cpu_context
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wbinvd
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call power_soc_deep_sleep
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/* Does not return */
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/*
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* This is an example function to handle the deep sleep resume notification
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* in the absence of bootloader context restore support.
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*
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* Bootloader in Intel Quark SE Microcontroller C1000 boards have
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* context restore support and this would not be required.
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*
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* Disclaimer: This can be used for debug or development purposes. This is not
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* a supported feature in Quark SE boards and to be used at one's own risk.
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*/
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SECTION_FUNC(TEXT, _sys_soc_resume_from_deep_sleep)
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movl $CONFIG_BSP_SHARED_RAM_ADDR, %eax
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cmpl $_power_restore_cpu_context, (%eax)
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je _power_restore_cpu_context
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ret
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#endif
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