osfmk/arm64/lowmem_vectors.c

   1 /*
   2  * Copyright (c) 2012-2013 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 #include <mach_kdp.h>
  30 #include <mach/vm_param.h>
  31 #include <arm64/lowglobals.h>
  32 #include <vm/vm_object.h>
  33 #include <vm/vm_page.h>
  34
  35 /*
  36  * On arm64, the low globals get mapped low via machine_init() during kernel
  37  * bootstrap.
  38  */
  39
  40 extern vm_offset_t vm_kernel_stext;
  41 extern void     *version;
  42 extern void     *kmod;
  43 extern void     *kdp_trans_off;
  44 extern void     *osversion;
  45 extern void     *flag_kdp_trigger_reboot;
  46 extern void     *manual_pkt;
  47 extern struct vm_object pmap_object_store;      /* store pt pages */
  48
  49 lowglo lowGlo __attribute__ ((aligned(PAGE_MAX_SIZE))) = {
  50         // Increment the major version for changes that break the current Astris
  51         // usage of lowGlo values
  52         // Increment the minor version for changes that provide additonal info/function
  53         // but does not break current usage
  54         .lgLayoutMajorVersion = 3,
  55         .lgLayoutMinorVersion = 2,
  56         .lgLayoutMagic = LOWGLO_LAYOUT_MAGIC,
  57         .lgVerCode = { 'K', 'r', 'a', 'k', 'e', 'n', ' ', ' ' },
  58         .lgZero = 0,
  59         .lgStext = 0, // To be filled in below
  60         .lgVersion = (uint64_t) &version,
  61         .lgOSVersion = (uint64_t) &osversion,
  62         .lgKmodptr = (uint64_t) &kmod,
  63 #if MACH_KDP && CONFIG_KDP_INTERACTIVE_DEBUGGING
  64         .lgTransOff = (uint64_t) &kdp_trans_off,
  65         .lgRebootFlag = (uint64_t) &flag_kdp_trigger_reboot,
  66         .lgManualPktAddr = (uint64_t) &manual_pkt,
  67 #endif
  68         .lgPmapMemQ = (uint64_t)&(pmap_object_store.memq),
  69         .lgPmapMemPageOffset = offsetof(struct vm_page_with_ppnum, vmp_phys_page),
  70         .lgPmapMemChainOffset = offsetof(struct vm_page, vmp_listq),
  71         .lgPmapMemPagesize = (uint64_t)sizeof(struct vm_page),
  72         .lgPmapMemFromArrayMask = VM_PAGE_PACKED_FROM_ARRAY,
  73         .lgPmapMemPackedShift = VM_PAGE_PACKED_PTR_SHIFT,
  74         .lgPmapMemPackedBaseAddr = VM_PAGE_PACKED_PTR_BASE,
  75         .lgPmapMemStartAddr = -1,
  76         .lgPmapMemEndAddr = -1,
  77         .lgPmapMemFirstppnum = -1,
  78         .lgPageShift = ARM_PGSHIFT,
  79         .lgVmFirstPhys = -1,
  80         .lgVmLastPhys = -1,
  81         .lgPhysMapBase = -1,
  82         .lgPhysMapEnd = -1,
  83         .lgPmapIoRangePtr = -1,
  84         .lgNumPmapIoRanges = -1
  85 };
  86
  87 void
  88 patch_low_glo(void)
  89 {
  90         lowGlo.lgStext = (uint64_t)vm_kernel_stext;
  91 }
  92
  93 void
  94 patch_low_glo_static_region(uint64_t address, uint64_t size)
  95 {
  96         lowGlo.lgStaticAddr = address;
  97         lowGlo.lgStaticSize = size;
  98
  99         /**
 100          * These values are set in pmap_bootstrap() and represent the range of
 101          * kernel managed memory.
 102          */
 103         extern const pmap_paddr_t vm_first_phys;
 104         extern const pmap_paddr_t vm_last_phys;
 105         assertf((vm_first_phys != 0) && (vm_last_phys != 0),
 106             "Tried setting the Low Globals before pmap_bootstrap()");
 107         lowGlo.lgVmFirstPhys = vm_first_phys;
 108         lowGlo.lgVmLastPhys = vm_last_phys;
 109
 110         /**
 111          * These values are set in pmap_bootstrap() and represent an array of all
 112          * kernel-managed I/O regions (pmap-io-ranges in the device tree). Some of
 113          * these regions may include DRAM carved out for usage by other agents on
 114          * the system.
 115          *
 116          * Need to forward-declare pmap_io_range_t since that only exists in the
 117          * PMAP code.
 118          */
 119         typedef struct pmap_io_range pmap_io_range_t;
 120         extern const pmap_io_range_t* io_attr_table;
 121         extern const unsigned int num_io_rgns;
 122         lowGlo.lgPmapIoRangePtr = (uint64_t)io_attr_table;
 123         lowGlo.lgNumPmapIoRanges = (uint64_t)num_io_rgns;
 124
 125         /**
 126          * These values are set in arm_vm_init() and represent the virtual address
 127          * space used by the physical aperture.
 128          */
 129         extern const vm_map_address_t physmap_base;
 130         extern const vm_map_address_t physmap_end;
 131         assertf((physmap_base != 0) && (physmap_end != 0),
 132             "Tried setting the Low Globals before arm_vm_init()");
 133         lowGlo.lgPhysMapBase = physmap_base;
 134         lowGlo.lgPhysMapEnd = physmap_end;
 135 }
 136
 137 void
 138 patch_low_glo_vm_page_info(void * start_addr, void * end_addr, uint32_t first_ppnum)
 139 {
 140         lowGlo.lgPmapMemStartAddr = (uint64_t)start_addr;
 141         lowGlo.lgPmapMemEndAddr = (uint64_t)end_addr;
 142         lowGlo.lgPmapMemFirstppnum = first_ppnum;
 143         lowGlo.lgPageShift = PAGE_SHIFT;
 144 }