| /* |
| * Copyright (c) 2019 Advanced Micro Devices, Inc. |
| * All rights reserved. |
| * |
| * For use for simulation and test purposes only |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * 3. Neither the name of the copyright holder nor the names of its |
| * contributors may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| * |
| * Authors: Brandon Potter |
| */ |
| |
| #include <sys/mman.h> |
| |
| #include <cstdint> |
| #include <cstdio> |
| #include <cstdlib> |
| #include <ctime> |
| |
| int main(void) |
| { |
| uint64_t page_size = 0x1000; |
| uint64_t num_pages = 0x10000; |
| uint64_t length = page_size * num_pages; |
| |
| void *raw = mmap(NULL, length, PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0); |
| uint8_t *mem = reinterpret_cast<uint8_t*>(raw); |
| |
| srand(0xABCD); |
| |
| uint64_t last_byte = page_size - 1; |
| uint64_t page_boundaries = num_pages - 1; |
| |
| for (int i = 0; i < 2000; i++) { |
| uint64_t random_boundary = rand() % page_boundaries; |
| uint64_t boundary_offset = random_boundary * page_size; |
| uint64_t boundary_last_byte = boundary_offset + last_byte; |
| uint32_t *poke = reinterpret_cast<uint32_t*>(mem + boundary_last_byte); |
| printf("%p\n", poke); |
| uint32_t value = *poke; |
| } |
| |
| return 0; |
| } |