osfmk/arm64/pal_hibernate.h

   1 /*
   2  * Copyright (c) 2020 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /**
  29  * ARM64 specific definitions for hibernation platform abstraction layer.
  30  */
  31
  32 #ifndef _ARM64_PAL_HIBERNATE_H
  33 #define _ARM64_PAL_HIBERNATE_H
  34
  35 #include <IOKit/IOHibernatePrivate.h>
  36
  37 __BEGIN_DECLS
  38
  39 /*!
  40  * @enum        pal_hib_map_type_t
  41  * @discussion  Parameter to pal_hib_map used to signify which memory region to map.
  42  */
  43 typedef enum {
  44         DEST_COPY_AREA = 1,
  45         COPY_PAGE_AREA,
  46         BITMAP_AREA,
  47         IMAGE_AREA,
  48         IMAGE2_AREA,
  49         SCRATCH_AREA,
  50         WKDM_AREA,
  51 } pal_hib_map_type_t;
  52
  53 /*!
  54  * @struct      pal_hib_ctx
  55  * @discussion  ARM64-specific PAL context; see pal_hib_ctx_t for details.
  56  */
  57 struct pal_hib_ctx {
  58 };
  59
  60 /*!
  61  * @typedef      pal_hib_globals_t
  62  * @discussion  ARM64-specific state preserved pre-hibernation and needed during hibernation resume.
  63  *
  64  * @field       dockChannelRegBase   Physical address of the dockchannel registers
  65  * @field       dockChannelWstatMask Mask to apply to dockchannel WSTAT register to compute available FIFO entries
  66  * @field       hibUartRegBase       Physical address of the UART registers
  67  * @field       hmacRegBase          Physical address of the hmac block registers
  68  * @field       kernelSlide          Offset from physical address to virtual address in the kernel map
  69  */
  70 typedef struct {
  71         uint64_t dockChannelRegBase;
  72         uint64_t dockChannelWstatMask;
  73         uint64_t hibUartRegBase;
  74         uint64_t hmacRegBase;
  75         uint64_t kernelSlide;
  76 } pal_hib_globals_t;
  77 extern pal_hib_globals_t gHibernateGlobals;
  78
  79 /*!
  80  * @function    pal_hib_get_stack_pages
  81  * @discussion  Returns the stack base address and number of pages to use during hibernation resume.
  82  *
  83  * @param       first_page      Out parameter: the base address of the hibernation resume stack
  84  * @param       page_count      Out parameter: the number of pages in the hibernation stack
  85  */
  86 void pal_hib_get_stack_pages(vm_offset_t *first_page, vm_offset_t *page_count);
  87
  88 /*!
  89  * @function    pal_hib_resume_tramp
  90  * @discussion  Platform-specific system setup before calling hibernate_kernel_entrypoint.
  91  *
  92  * @param       headerPpnum     The page number of the IOHibernateImageHeader
  93  */
  94 void pal_hib_resume_tramp(uint32_t headerPpnum);
  95
  96 /*!
  97  * @typedef      pal_hib_tramp_result_t
  98  * @discussion  This type is used to store the result of pal_hib_resume_tramp.
  99  *
 100  * @field       ttbr0               Physical address of the first level translation table (low mem)
 101  * @field       ttbr1               Physical address of the first level translation table (high mem)
 102  * @field       memSlide            Offset from physical address to virtual address during hibernation resume
 103  */
 104 typedef struct{
 105         uint64_t ttbr0;
 106         uint64_t ttbr1;
 107         uint64_t memSlide;
 108 } pal_hib_tramp_result_t;
 109
 110 #if HIBERNATE_TRAP_HANDLER
 111 /*!
 112  * @function    hibernate_trap
 113  * @discussion  Platform-specific function for handling a trap during hibernation resume.
 114  *
 115  * @param       context         The context captured during the trap
 116  * @param       trap_addr       The address of the low level trap handler that was invoked
 117  */
 118 void hibernate_trap(arm_context_t *context, uint64_t trap_addr) __attribute__((noreturn));
 119 #endif /* HIBERNATE_TRAP_HANDLER */
 120
 121 __END_DECLS
 122
 123 #endif /* _ARM64_PAL_HIBERNATE_H */