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 uint32_t lgVmFirstPhys; /* 0xffff13DC First physical address of kernel-managed DRAM (inclusive) */ 70 uint32_t lgVmLastPhys; /* 0xffff13E0 Last physical address of kernel-managed DRAM (exclusive) */ 71 } lowglo; 72 #pragma pack() 73 74 extern lowglo lowGlo; 75 76 void patch_low_glo(void); 77 void patch_low_glo_static_region(uint32_t address, uint32_t size); 78 void patch_low_glo_vm_page_info(void *, void *, uint32_t); 79 80 #endif /* _LOW_MEMORY_GLOBALS_H_ */ 81