| | 1 | /* |
| | 2 | * Copyright (c) 2019 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 <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> |
| | 34 | |
| | 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]; |
| | 38 | |
| | 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 | }; |
| | 46 | |
| | 47 | void |
| | 48 | entropy_buffer_init(void) |
| | 49 | { |
| | 50 | uint32_t ebsz = 0; |
| | 51 | uint32_t *bp; |
| | 52 | |
| | 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 | } |
| | 57 | |
| | 58 | register_entropy_sysctl(); |
| | 59 | |
| | 60 | bp = zalloc_permanent(sizeof(uint32_t) * ebsz, ZALIGN(uint32_t)); |
| | 61 | |
| | 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 | } |
| | 70 | } |
projects / apple / xnu.git / blame_incremental