projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b | 1 | /* |
| f427ee49 | 2 | * Copyright (c) 2019 Apple Inc. All rights reserved. |
| 5d5c5d0d | 3 | * |
| 2d21ac55 | 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
| 5ba3f43e | 5 | * |
| 2d21ac55 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. | |
| 5ba3f43e | 14 | * |
| 2d21ac55 A |
15 | * Please obtain a copy of the License at |
| 16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. | |
| 5ba3f43e | 17 | * |
| 2d21ac55 A |
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 | |
| 8f6c56a5 A |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 2d21ac55 A |
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. | |
| 5ba3f43e | 25 | * |
| 2d21ac55 | 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
| 1c79356b | 27 | */ |
| 1c79356b | 28 | |
| f427ee49 A |
29 | #include <kern/zalloc.h> |
| 30 | #include <pexpert/pexpert.h> | |
| 31 | #include <prng/entropy.h> | |
| 32 | #include <crypto/entropy/diag_entropy_sysctl.h> | |
| 33 | #include <machine/machine_routines.h> | |
| cb323159 | 34 | |
| f427ee49 A |
35 | // Use a static buffer when the entropy collection boot arg is not present and before the |
| 36 | // RNG has been initialized. | |
| 37 | static uint32_t entropy_buffer[ENTROPY_BUFFER_SIZE]; | |
| cb323159 | 38 | |
| f427ee49 A |
39 | entropy_data_t EntropyData = { |
| 40 | .sample_count = 0, | |
| 41 | .buffer = entropy_buffer, | |
| 42 | .buffer_size = ENTROPY_BUFFER_SIZE, | |
| 43 | .buffer_index_mask = ENTROPY_BUFFER_SIZE - 1, | |
| 44 | .ror_mask = -1 | |
| 45 | }; | |
| 1c79356b | 46 | |
| 0a7de745 | 47 | void |
| f427ee49 | 48 | entropy_buffer_init(void) |
| 1c79356b | 49 | { |
| f427ee49 A |
50 | uint32_t ebsz = 0; |
| 51 | uint32_t *bp; | |
| 1c79356b | 52 | |
| f427ee49 A |
53 | if (PE_parse_boot_argn("ebsz", &ebsz, sizeof(ebsz))) { |
| 54 | if (((ebsz & (ebsz - 1)) != 0) || (ebsz < 32)) { | |
| 55 | panic("entropy_buffer_init: entropy buffer size must be a power of 2 and >= 32\n"); | |
| 56 | } | |
| cb323159 | 57 | |
| f427ee49 | 58 | register_entropy_sysctl(); |
| cb323159 | 59 | |
| f427ee49 | 60 | bp = zalloc_permanent(sizeof(uint32_t) * ebsz, ZALIGN(uint32_t)); |
| cb323159 | 61 | |
| f427ee49 A |
62 | boolean_t interrupt_state = ml_set_interrupts_enabled(FALSE); |
| 63 | EntropyData.buffer = bp; | |
| 64 | EntropyData.sample_count = 0; | |
| 65 | EntropyData.buffer_size = sizeof(uint32_t) * ebsz; | |
| 66 | EntropyData.buffer_index_mask = ebsz - 1; | |
| 67 | EntropyData.ror_mask = 0; | |
| 68 | ml_set_interrupts_enabled(interrupt_state); | |
| 69 | } | |
| 1c79356b | 70 | } |