1 | /* |
2 | * Copyright (c) 2011-2018 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 <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 * = 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 | |
86 | |