xnu-7195.101.1.tar.gz

[apple/xnu.git] / pexpert / arm / pe_consistent_debug.c

diff --git a/pexpert/arm/pe_consistent_debug.c b/pexpert/arm/pe_consistent_debug.c
index 103a1bb90c5940acb23ae28c9f2179c4dab5aee6..d43130ffe0fb0d4bcbe1cc5711d7bc12499a262b 100644 (file)
--- a/pexpert/arm/pe_consistent_debug.c
+++ b/pexpert/arm/pe_consistent_debug.c
@@ -1,12 +1,29 @@
 /*
- * Copyright (C) 2011-2013 Apple Inc. All rights reserved.
+ * Copyright (c) 2011-2018 Apple Inc. All rights reserved.
  *
- * This document is the property of Apple Inc.
- * It is considered confidential and proprietary.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  *
- * This document may not be reproduced or transmitted in any form,
- * in whole or in part, without the express written permission of
- * Apple Inc.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 
 #include <pexpert/pexpert.h>
@@ -15,13 +32,16 @@
 #include <libkern/OSAtomic.h>
 #include <machine/machine_routines.h>
 
-static dbg_registry_t * consistent_debug_registry = NULL; 
+static dbg_registry_t * consistent_debug_registry = NULL;
 
-static dbg_record_header_t* consistent_debug_allocate_entry(void) {
+static dbg_record_header_t*
+consistent_debug_allocate_entry(void)
+{
        unsigned int i;
 
-       if (!consistent_debug_registry)
+       if (!consistent_debug_registry) {
                return NULL;
+       }
        for (i = 0; i < consistent_debug_registry->top_level_header.num_records; i++) {
                dbg_record_header_t *record = &consistent_debug_registry->records[i];
                if (OSCompareAndSwap64(kDbgIdUnusedEntry, kDbgIdReservedEntry, &record->record_id)) {
@@ -32,37 +52,61 @@ static dbg_record_header_t* consistent_debug_allocate_entry(void) {
        return NULL;
 }
 
-int PE_consistent_debug_inherit(void)
+boolean_t
+PE_consistent_debug_lookup_entry(uint64_t record_id, uint64_t *phys_addr, uint64_t *length)
+{
+       assert(phys_addr != NULL);
+       assert(length != NULL);
+
+       for (unsigned int i = 0; i < consistent_debug_registry->top_level_header.num_records; i++) {
+               if (consistent_debug_registry->records[i].record_id == record_id) {
+                       *phys_addr = consistent_debug_registry->records[i].physaddr;
+                       *length = consistent_debug_registry->records[i].length;
+
+                       return true;
+               }
+       }
+
+       return false;
+}
+
+int
+PE_consistent_debug_inherit(void)
 {
-       DTEntry         entryP;
-       uintptr_t       *prop_data;
-       uintptr_t       root_pointer = 0;
-       uint32_t        size;
+       DTEntry         entryP;
+       uintptr_t const *prop_data;
+       uintptr_t       root_pointer = 0;
+       uint32_t        size;
 
-        if ((DTLookupEntry(NULL, "/chosen", &entryP) == kSuccess))
-               if (DTGetProperty(entryP, "consistent-debug-root", (void **)&prop_data, &size) == kSuccess)
+       if ((SecureDTLookupEntry(NULL, "/chosen", &entryP) == kSuccess)) {
+               if (SecureDTGetProperty(entryP, "consistent-debug-root", (void const **)&prop_data, &size) == kSuccess) {
                        root_pointer = prop_data[0];
-       if (root_pointer == 0)
+               }
+       }
+       if (root_pointer == 0) {
                return -1;
+       }
        consistent_debug_registry = (dbg_registry_t *)ml_map_high_window(root_pointer, sizeof(dbg_registry_t));
        return 0;
 }
 
-int PE_consistent_debug_register(uint64_t record_id, uint64_t physaddr, uint64_t length)
+int
+PE_consistent_debug_register(uint64_t record_id, uint64_t physaddr, uint64_t length)
 {
        dbg_record_header_t *allocated_header = consistent_debug_allocate_entry();
-       if (allocated_header == NULL)
+       if (allocated_header == NULL) {
                return -1;
+       }
        allocated_header->length = length;
        allocated_header->physaddr = physaddr;
        // Make sure the hdr/length are visible before the record_id.
-       __asm__ volatile("dmb ish" : : : "memory");
+       __asm__ volatile ("dmb ish" : : : "memory");
        allocated_header->record_id = record_id;
        return 0;
 }
 
-int PE_consistent_debug_enabled(void)
+int
+PE_consistent_debug_enabled(void)
 {
-       return (consistent_debug_registry != NULL);
+       return consistent_debug_registry != NULL;
 }
-