osfmk/arm/lowglobals.h

   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 #ifndef __arm__
  35 #error  Wrong architecture - this file is meant for arm
  36 #endif
  37
  38 #define LOWGLO_LAYOUT_MAGIC             0xC0DEC0DE
  39
  40 #pragma pack(4)         /* Make sure the structure stays as we defined it */
  41 typedef struct lowglo {
  42         unsigned char           lgVerCode[8];           /* 0xffff1000 System verification code */
  43         uint32_t                lgZero[2];                      /* 0xffff1008 Double constant 0 */
  44         uint32_t                lgStext;                        /* 0xffff1010 Start of kernel text */
  45         uint32_t                lgRsv014[2];            /* 0xffff1014 Reserved */
  46         uint32_t                lgVersion;                      /* 0xffff101C Pointer to kernel version string */
  47         uint32_t                lgRsv020[216];          /* 0xffff1020 Reserved */
  48         uint32_t                lgKmodptr;                      /* 0xffff1380 Pointer to kmod, debugging aid */
  49         uint32_t                lgTransOff;                     /* 0xffff1384 Pointer to kdp_trans_off, debugging aid */
  50         uint32_t                lgRsv388[3];            /* 0xffff1388 Reserved */
  51         uint32_t                lgOSVersion;            /* 0xffff1394 Pointer to OS version string */
  52         uint32_t                lgRsv398;                       /* 0xffff1398 Reserved */
  53         uint32_t                lgRebootFlag;           /* 0xffff139C Pointer to debugger reboot trigger */
  54         uint32_t                lgManualPktAddr;        /* 0xffff13A0 Pointer to manual packet structure */
  55         uint32_t                lgRsv3A4;                       /* 0xffff13A4 Reserved */
  56         uint32_t                lgPmapMemQ;                     /* 0xffff13A8 Pointer to PMAP memory queue */
  57         uint32_t                lgPmapMemPageOffset;/* 0xffff13AC Offset of physical page member in vm_page_with_ppnum_t */
  58         uint32_t                lgPmapMemChainOffset;/*0xffff13B0 Offset of listq in vm_page_t or vm_page_with_ppnum_t */
  59         uint32_t                lgStaticAddr;           /* 0xffff13B4 Static allocation address */
  60         uint32_t                lgStaticSize;           /* 0xffff13B8 Static allocation size */
  61         uint32_t                lgLayoutMajorVersion;   /* 0xffff13BC Lowglo layout major version */
  62         uint32_t                lgLayoutMagic;          /* 0xffff13C0 Magic value evaluated to determine if lgLayoutVersion is valid */
  63         uint32_t                lgPmapMemStartAddr;     /* 0xffff13C4 Pointer to start of vm_page_t array */
  64         uint32_t                lgPmapMemEndAddr;       /* 0xffff13C8 Pointer to end of vm_page_t array */
  65         uint32_t                lgPmapMemPagesize;      /* 0xffff13CC size of vm_page_t */
  66         uint32_t                lgPmapMemFirstppnum;    /* 0xffff13D0 physical page number of the first vm_page_t in the array */
  67         uint32_t                lgLayoutMinorVersion;   /* 0xffff13D4 Lowglo layout minor version */
  68         uint32_t                lgPageShift;            /* 0xffff13D8 Number of shifts from page number to size */
  69 } lowglo;
  70 #pragma pack()
  71
  72 extern lowglo lowGlo;
  73
  74 void patch_low_glo(void);
  75 void patch_low_glo_static_region(uint32_t address, uint32_t size);
  76 void patch_low_glo_vm_page_info(void *, void *, uint32_t);
  77
  78 #endif /* _LOW_MEMORY_GLOBALS_H_ */