| /* |
| * Copyright 2012 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 <coreboot_tables.h> |
| #include <libpayload.h> |
| #include <stdint.h> |
| #include <sysinfo.h> |
| |
| #include "base/ranges.h" |
| #include "base/physmem.h" |
| #include "image/symbols.h" |
| #include "vboot/util/memory.h" |
| |
| static Ranges used; |
| |
| static void used_list_initialize(void) |
| { |
| static int initialized; |
| if (initialized) |
| return; |
| |
| ranges_init(&used); |
| |
| // Add regions depthcharge occupies. |
| ranges_add(&used, (uintptr_t)&_start, (uintptr_t)&_end); |
| // Remove trampoline area if it is non-zero in size. |
| if (&_tramp_start != &_tramp_end) |
| ranges_add(&used, (uintptr_t)&_tramp_start, |
| (uintptr_t)&_tramp_end); |
| |
| initialized = 1; |
| } |
| |
| void memory_mark_used(uint64_t start, uint64_t end) |
| { |
| used_list_initialize(); |
| ranges_add(&used, start, end); |
| } |
| |
| |
| static void unused_memset(uint64_t start, uint64_t end, void *data) |
| { |
| printf("\t[%#016llx, %#016llx)\n", start, end); |
| arch_phys_memset(start, 0, end - start); |
| } |
| |
| static void remove_range(uint64_t start, uint64_t end, void *data) |
| { |
| ranges_sub((Ranges *)data, start, end); |
| } |
| |
| int memory_wipe_unused(void) |
| { |
| Ranges ranges; |
| |
| // Process the memory map from coreboot. |
| ranges_init(&ranges); |
| for (int i = 0; i < lib_sysinfo.n_memranges; i++) { |
| struct memrange *range = &lib_sysinfo.memrange[i]; |
| uint64_t start = range->base; |
| uint64_t end = range->base + range->size; |
| switch (range->type) { |
| case CB_MEM_RAM: |
| ranges_add(&ranges, start, end); |
| break; |
| case CB_MEM_RESERVED: |
| case CB_MEM_ACPI: |
| case CB_MEM_NVS: |
| case CB_MEM_UNUSABLE: |
| case CB_MEM_VENDOR_RSVD: |
| case CB_MEM_TABLE: |
| ranges_sub(&ranges, start, end); |
| break; |
| default: |
| printf("Unrecognized memory type %d!\n", |
| range->type); |
| return 1; |
| } |
| } |
| |
| // Exclude memory that's being used. |
| used_list_initialize(); |
| ranges_for_each(&used, &remove_range, &ranges); |
| |
| // Do the wipe. |
| printf("Wipe memory regions:\n"); |
| ranges_for_each(&ranges, &unused_memset, NULL); |
| ranges_teardown(&ranges); |
| return 0; |
| } |