projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 5ba3f43e | 1 | /* |
| a39ff7e2 | 2 | * Copyright (c) 2011-2018 Apple Inc. All rights reserved. |
| 5ba3f43e | 3 | * |
| a39ff7e2 | 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
| 5ba3f43e | 5 | * |
| a39ff7e2 A |
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@ | |
| 5ba3f43e A |
27 | */ |
| 28 | ||
| 29 | #include <pexpert/pexpert.h> | |
| 30 | #include <pexpert/arm/consistent_debug.h> | |
| 31 | #include <pexpert/device_tree.h> | |
| 32 | #include <libkern/OSAtomic.h> | |
| 33 | #include <machine/machine_routines.h> | |
| 34 | ||
| 35 | static dbg_registry_t * consistent_debug_registry = NULL; | |
| 36 | ||
| 37 | static dbg_record_header_t* consistent_debug_allocate_entry(void) { | |
| 38 | unsigned int i; | |
| 39 | ||
| 40 | if (!consistent_debug_registry) | |
| 41 | return NULL; | |
| 42 | for (i = 0; i < consistent_debug_registry->top_level_header.num_records; i++) { | |
| 43 | dbg_record_header_t *record = &consistent_debug_registry->records[i]; | |
| 44 | if (OSCompareAndSwap64(kDbgIdUnusedEntry, kDbgIdReservedEntry, &record->record_id)) { | |
| 45 | // Reserved an entry at position i. | |
| 46 | return (dbg_record_header_t*)record; | |
| 47 | } | |
| 48 | } | |
| 49 | return NULL; | |
| 50 | } | |
| 51 | ||
| 52 | int PE_consistent_debug_inherit(void) | |
| 53 | { | |
| 54 | DTEntry entryP; | |
| 55 | uintptr_t *prop_data; | |
| 56 | uintptr_t root_pointer = 0; | |
| 57 | uint32_t size; | |
| 58 | ||
| 59 | if ((DTLookupEntry(NULL, "/chosen", &entryP) == kSuccess)) | |
| 60 | if (DTGetProperty(entryP, "consistent-debug-root", (void **)&prop_data, &size) == kSuccess) | |
| 61 | root_pointer = prop_data[0]; | |
| 62 | if (root_pointer == 0) | |
| 63 | return -1; | |
| 64 | consistent_debug_registry = (dbg_registry_t *)ml_map_high_window(root_pointer, sizeof(dbg_registry_t)); | |
| 65 | return 0; | |
| 66 | } | |
| 67 | ||
| 68 | int PE_consistent_debug_register(uint64_t record_id, uint64_t physaddr, uint64_t length) | |
| 69 | { | |
| 70 | dbg_record_header_t *allocated_header = consistent_debug_allocate_entry(); | |
| 71 | if (allocated_header == NULL) | |
| 72 | return -1; | |
| 73 | allocated_header->length = length; | |
| 74 | allocated_header->physaddr = physaddr; | |
| 75 | // Make sure the hdr/length are visible before the record_id. | |
| 76 | __asm__ volatile("dmb ish" : : : "memory"); | |
| 77 | allocated_header->record_id = record_id; | |
| 78 | return 0; | |
| 79 | } | |
| 80 | ||
| 81 | int PE_consistent_debug_enabled(void) | |
| 82 | { | |
| 83 | return (consistent_debug_registry != NULL); | |
| 84 | } | |
| 85 |