| /* |
| * 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 <inttypes.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include "base/fwdb.h" |
| #include "base/memory.h" |
| #include "base/ranges.h" |
| #include "module/symbols.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); |
| |
| 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[%#016"PRIx64", %#016"PRIx64")\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); |
| E820MemRanges *e820 = get_e820_mem_ranges(); |
| if (!e820) |
| return 1; |
| for (int i = 0; i < e820->num_ranges; i++) { |
| E820MemRange *range = &e820->ranges[i]; |
| uint64_t start = range->base; |
| uint64_t end = range->base + range->size; |
| switch (range->type) { |
| case E820MemRange_Ram: |
| ranges_add(&ranges, start, end); |
| break; |
| case E820MemRange_Reserved: |
| case E820MemRange_Acpi: |
| case E820MemRange_Nvs: |
| case E820MemRange_Unusable: |
| 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; |
| } |
| |
| static const char e820_fwdb_name[] = "e820 memory ranges"; |
| |
| int prepare_e820_mem_ranges(void) |
| { |
| FwdbEntry entry = { |
| .size = sizeof(E820MemRanges), |
| .ptr = NULL, |
| }; |
| |
| return fwdb_access(e820_fwdb_name, NULL, &entry); |
| } |
| |
| E820MemRanges *get_e820_mem_ranges(void) |
| { |
| static E820MemRanges *ranges; |
| if (ranges) |
| return ranges; |
| |
| FwdbEntry entry; |
| if (fwdb_access(e820_fwdb_name, &entry, NULL)) { |
| printf("E820 ranges not found in the fwdb.\n"); |
| return NULL; |
| } |
| |
| if (entry.size != sizeof(E820MemRanges)) { |
| printf("E820 ranges not the expected size.\n"); |
| return NULL; |
| } |
| |
| ranges = entry.ptr; |
| return ranges; |
| } |