| /* |
| * Copyright 2013 Google Inc. |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but without any warranty; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| #include <assert.h> |
| #include <libpayload.h> |
| #include <stddef.h> |
| #include <string.h> |
| |
| #include <arch/cache.h> |
| #include "base/physmem.h" |
| |
| // arch_phys_memset but with the guarantee that the range doesn't wrap around |
| // the end of the address space. |
| static uint64_t arch_phys_memset_nowrap(uint64_t start, int c, uint64_t size) |
| { |
| uint64_t max_addr = (uint64_t)~(uintptr_t)0; |
| uint64_t orig_start = start; |
| |
| // If there's nothing to do, just return. |
| if (!size) |
| return orig_start; |
| |
| // Set memory we can address normally using standard memset. |
| if (start <= max_addr) { |
| size_t low_size; |
| // Be careful with this check to avoid overflow. |
| if (size - 1 > max_addr - start) { |
| low_size = 0 - start; |
| } else { |
| low_size = (size_t)size; |
| assert(low_size == size); |
| } |
| memset((void *)(uintptr_t)start, c, low_size); |
| start += low_size; |
| size -= low_size; |
| } |
| |
| // If we're done, return. |
| if (!size) |
| return orig_start; |
| |
| // memset above 4GB. |
| do { |
| void *buf; |
| int len = MIN(size, 2*MiB); |
| /* writeback is ~4 times as fast as writethrough on T124 */ |
| buf = lpae_map_phys_addr(start / MiB, DCACHE_WRITEBACK); |
| memset(buf, c, len); |
| start += len; |
| size -= len; |
| } while (size > 0); |
| |
| lpae_restore_map(); |
| return orig_start; |
| } |
| |
| uint64_t arch_phys_memset(uint64_t start, int c, uint64_t size) |
| { |
| uint64_t end = start + size; |
| |
| if (end && end < start) { |
| // If the range wraps around 0, set the upper and lower parts |
| // separately. |
| arch_phys_memset_nowrap(0, c, end); |
| return arch_phys_memset_nowrap(start, c, 0 - start); |
| } else { |
| // No wrap, set everything at once. |
| return arch_phys_memset_nowrap(start, c, size); |
| } |
| } |