1 /*
2 * Copyright (c) 2020 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 #if __arm64__
31 #include <pexpert/arm64/board_config.h>
32 #include <arm64/hv_hvc.h>
33 #endif /* __arm64__ */
34
35 #include <arm/cpuid_internal.h>
36 #include <arm/pmap.h>
37 #include <arm64/proc_reg.h>
38 #include <machine/machine_cpuid.h>
39 #include <machine/machine_routines.h>
40
41
42 #if __arm64__
43
44 void configure_misc_apple_boot_args(void);
45 void configure_misc_apple_regs(void);
46 void configure_timer_apple_regs(void);
47
48 void
configure_misc_apple_boot_args(void)49 configure_misc_apple_boot_args(void)
50 {
51 }
52
53 void
configure_misc_apple_regs(void)54 configure_misc_apple_regs(void)
55 {
56 }
57
58 void
configure_timer_apple_regs(void)59 configure_timer_apple_regs(void)
60 {
61 }
62
63 #endif /* __arm64__ */
64
65 #if HAS_APPLE_PAC
66
67 #if HAS_PARAVIRTUALIZED_PAC
68 static uint64_t vmapple_default_rop_pid;
69 static uint64_t vmapple_default_jop_pid;
70
71 static inline void
vmapple_pac_get_default_keys()72 vmapple_pac_get_default_keys()
73 {
74 static bool initialized = false;
75 if (os_atomic_xchg(&initialized, true, relaxed)) {
76 return;
77 }
78
79 const uint64_t fn = VMAPPLE_PAC_GET_DEFAULT_KEYS;
80 asm volatile (
81 "mov x0, %[fn]" "\n"
82 "hvc #0" "\n"
83 "str x2, %[b_key]" "\n"
84 "str x3, %[el0_key]" "\n"
85 : [b_key] "=m"(vmapple_default_rop_pid),
86 [el0_key] "=m"(vmapple_default_jop_pid)
87 : [fn] "r"(fn)
88 : "x0", "x1", "x2", "x3", "x4"
89 );
90 }
91
92 #endif /* HAS_PARAVIRTUALIZED_PAC */
93
94 /**
95 * Returns the default ROP key.
96 */
97 uint64_t
ml_default_rop_pid(void)98 ml_default_rop_pid(void)
99 {
100 #if HAS_PARAVIRTUALIZED_PAC
101 vmapple_pac_get_default_keys();
102 return vmapple_default_rop_pid;
103 #else
104 return 0;
105 #endif /* HAS_PARAVIRTUALIZED_PAC */
106 }
107
108 /**
109 * Returns the default JOP key.
110 */
111 uint64_t
ml_default_jop_pid(void)112 ml_default_jop_pid(void)
113 {
114 #if HAS_PARAVIRTUALIZED_PAC
115 vmapple_pac_get_default_keys();
116 return vmapple_default_jop_pid;
117 #else
118 return 0;
119 #endif /* HAS_PARAVIRTUALIZED_PAC */
120 }
121 #endif /* HAS_APPLE_PAC */
122