112 lines
2.7 KiB
ArmAsm
112 lines
2.7 KiB
ArmAsm
/*
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* Copyright (c) 2016 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <arch/x86/asm.h>
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#ifdef CONFIG_SYS_POWER_DEEP_SLEEP_STATES
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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_resume_from_deep_sleep)
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GTEXT(z_power_restore_cpu_context)
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GTEXT(z_power_soc_sleep)
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GTEXT(z_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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#if defined (CONFIG_DEBUG)
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/* save the debug registers */
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movl %dr0, %edx
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pushl %edx
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movl %dr1, %edx
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pushl %edx
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movl %dr2, %edx
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pushl %edx
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movl %dr3, %edx
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pushl %edx
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movl %dr6, %edx
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pushl %edx
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movl %dr7, %edx
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pushl %edx
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#endif
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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, z_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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#if defined (CONFIG_DEBUG)
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/* restore the debug registers */
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popl %edx
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movl %edx, %dr7
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popl %edx
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movl %edx, %dr6
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popl %edx
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movl %edx, %dr3
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popl %edx
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movl %edx, %dr2
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popl %edx
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movl %edx, %dr1
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popl %edx
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movl %edx, %dr0
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#endif
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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 z_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 z_power_soc_sleep or z_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, z_power_soc_sleep)
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call save_cpu_context
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wbinvd
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call qm_power_soc_sleep
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/* Does not return */
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SECTION_FUNC(TEXT, z_power_soc_deep_sleep)
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call save_cpu_context
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wbinvd
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call qm_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_resume_from_deep_sleep)
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movl $CONFIG_BSP_SHARED_RESTORE_INFO_RAM_ADDR, %eax
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cmpl $z_power_restore_cpu_context, (%eax)
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je z_power_restore_cpu_context
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ret
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#endif
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