1  /*
 2   * Copyright (c) 2017 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   *		Header files for the Low Memory Globals (lg)
30   */
31  #ifndef _LOW_MEMORY_GLOBALS_H_
32  #define _LOW_MEMORY_GLOBALS_H_
33  
34  #include <mach/mach_types.h>
35  #include <mach/vm_types.h>
36  #include <mach/machine/vm_types.h>
37  #include <mach/vm_prot.h>
38  
39  #ifndef __arm64__
40  #error  Wrong architecture - this file is meant for arm64
41  #endif
42  
43  #define LOWGLO_LAYOUT_MAGIC             0xC0DEC0DE
44  
45  /*
46   * This structure is bound to lowmem_vectors.c. Make sure changes here are
47   * reflected there as well.
48   */
49  
50  #pragma pack(8) /* Make sure the structure stays as we defined it */
51  typedef struct lowglo {
52  	unsigned char lgVerCode[8];            /* 0xffffff8000002000 System verification code */
53  	uint64_t      lgZero;                  /* 0xffffff8000002008 Constant 0 */
54  	uint64_t      lgStext;                 /* 0xffffff8000002010 Start of kernel text */
55  	uint64_t      lgVersion;               /* 0xffffff8000002018 Pointer to kernel version string */
56  	uint64_t      lgOSVersion;             /* 0xffffff8000002020 Pointer to OS version string */
57  	uint64_t      lgKmodptr;               /* 0xffffff8000002028 Pointer to kmod, debugging aid */
58  	uint64_t      lgTransOff;              /* 0xffffff8000002030 Pointer to kdp_trans_off, debugging aid */
59  	uint64_t      lgRebootFlag;            /* 0xffffff8000002038 Pointer to debugger reboot trigger */
60  	uint64_t      lgManualPktAddr;         /* 0xffffff8000002040 Pointer to manual packet structure */
61  	uint64_t      lgAltDebugger;           /* 0xffffff8000002048 Pointer to reserved space for alternate kernel debugger */
62  	uint64_t      lgPmapMemQ;              /* 0xffffff8000002050 Pointer to PMAP memory queue */
63  	uint64_t      lgPmapMemPageOffset;     /* 0xffffff8000002058 Offset of physical page member in vm_page_t or vm_page_with_ppnum_t */
64  	uint64_t      lgPmapMemChainOffset;    /* 0xffffff8000002060 Offset of listq in vm_page_t or vm_page_with_ppnum_t */
65  	uint64_t      lgStaticAddr;            /* 0xffffff8000002068 Static allocation address */
66  	uint64_t      lgStaticSize;            /* 0xffffff8000002070 Static allocation size */
67  	uint64_t      lgLayoutMajorVersion;    /* 0xffffff8000002078 Lowglo major layout version */
68  	uint64_t      lgLayoutMagic;           /* 0xffffff8000002080 Magic value evaluated to determine if lgLayoutVersion is valid */
69  	uint64_t      lgPmapMemStartAddr;      /* 0xffffff8000002088 Pointer to start of vm_page_t array */
70  	uint64_t      lgPmapMemEndAddr;        /* 0xffffff8000002090 Pointer to end of vm_page_t array */
71  	uint64_t      lgPmapMemPagesize;       /* 0xffffff8000002098 size of vm_page_t */
72  	uint64_t      lgPmapMemFromArrayMask;  /* 0xffffff80000020A0 Mask to indicate page is from vm_page_t array */
73  	uint64_t      lgPmapMemFirstppnum;     /* 0xffffff80000020A8 physical page number of the first vm_page_t in the array */
74  	uint64_t      lgPmapMemPackedShift;    /* 0xffffff80000020B0 alignment of packed pointer */
75  	uint64_t      lgPmapMemPackedBaseAddr; /* 0xffffff80000020B8 base address of that packed pointers are relative to */
76  	uint64_t      lgLayoutMinorVersion;    /* 0xffffff80000020C0 Lowglo minor layout version */
77  	uint64_t      lgPageShift;             /* 0xffffff80000020C8 number of shifts from page number to size */
78  	uint64_t      lgVmFirstPhys;           /* 0xffffff80000020D0 First physical address of kernel-managed DRAM (inclusive) */
79  	uint64_t      lgVmLastPhys;            /* 0xffffff80000020D8 Last physical address of kernel-managed DRAM (exclusive) */
80  	uint64_t      lgPhysMapBase;           /* 0xffffff80000020E0 First virtual address of the Physical Aperture (inclusive) */
81  	uint64_t      lgPhysMapEnd;            /* 0xffffff80000020E8 Last virtual address of the Physical Aperture (exclusive) */
82  	uint64_t      lgPmapIoRangePtr;        /* 0xffffff80000020F0 Pointer to an array of pmap_io_range_t objects obtained from the device tree. */
83  	uint64_t      lgNumPmapIoRanges;       /* 0xffffff80000020F8 Number of pmap_io_range regions in the array represented by lgPmapIoRangePtr. */
84  } lowglo;
85  #pragma pack()
86  
87  extern lowglo lowGlo;
88  
89  void patch_low_glo(void);
90  void patch_low_glo_static_region(uint64_t address, uint64_t size);
91  void patch_low_glo_vm_page_info(void *, void *, uint32_t);
92  
93  #endif /* _LOW_MEMORY_GLOBALS_H_ */