| /* |
| * Copyright 2014 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 <endian.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include <sysinfo.h> |
| |
| #include "base/device_tree.h" |
| #include "base/init_funcs.h" |
| #include "base/list.h" |
| #include "base/memory.h" |
| #include "base/xalloc.h" |
| #include "boot/ramoops.h" |
| |
| typedef struct |
| { |
| uint64_t start; |
| uint64_t size; |
| uint64_t record_size; |
| |
| DeviceTreeFixup fixup; |
| } Ramoops; |
| |
| /* Undocumented, but linux kernel expects record-size to use only one cell */ |
| static const int RecordSizeCells = 1; |
| |
| static int ramoops_fixup(DeviceTreeFixup *fixup, DeviceTree *tree) |
| { |
| Ramoops *ramoops = container_of(fixup, Ramoops, fixup); |
| |
| // Eliminate any existing ramoops node. |
| DeviceTreeNode *node = dt_find_compat(tree->root, "ramoops"); |
| if (node) |
| list_remove(&node->list_node); |
| |
| uint32_t addr_cells = 1, size_cells = 1; |
| dt_read_cell_props(tree->root, &addr_cells, &size_cells); |
| |
| // Create a ramoops node at the root of the tree. |
| node = xzalloc(sizeof(*node)); |
| node->name = "ramoops"; |
| list_insert_after(&node->list_node, &tree->root->children); |
| |
| // Add a compatible property. |
| dt_add_string_prop(node, "compatible", "ramoops"); |
| |
| // Add a reg property. |
| dt_add_reg_prop(node, &ramoops->start, &ramoops->size, 1, |
| addr_cells, size_cells); |
| |
| // Add a record-size property. |
| uint8_t *data = xzalloc(size_cells * sizeof(uint32_t)); |
| dt_write_int(data, ramoops->record_size, |
| RecordSizeCells * sizeof(uint32_t)); |
| dt_add_bin_prop(node, "record-size", data, |
| RecordSizeCells * sizeof(uint32_t)); |
| |
| // Add the optional dump-oops property. |
| dt_add_bin_prop(node, "dump-oops", NULL, 0); |
| |
| // Add a memory reservation for the buffer range. |
| DeviceTreeReserveMapEntry *reserve = xzalloc(sizeof(*reserve)); |
| reserve->start = ramoops->start; |
| reserve->size = ramoops->size; |
| list_insert_after(&reserve->list_node, &tree->reserve_map); |
| |
| return 0; |
| } |
| |
| void ramoops_buffer(uint64_t start, uint64_t size, uint64_t record_size) |
| { |
| static Ramoops ramoops; |
| |
| die_if(ramoops.fixup.fixup, "Only one ramoops buffer allowed.\n"); |
| |
| ramoops.start = start; |
| ramoops.size = size; |
| ramoops.record_size = record_size; |
| ramoops.fixup.fixup = &ramoops_fixup; |
| list_insert_after(&ramoops.fixup.list_node, &device_tree_fixups); |
| |
| memory_mark_used(start, start + size); |
| } |
| |
| static int ramoops_init(void) |
| { |
| if (get_sysinfo()->ramoops_buffer == 0 || |
| get_sysinfo()->ramoops_buffer_size == 0) |
| return 0; |
| |
| ramoops_buffer(get_sysinfo()->ramoops_buffer, |
| get_sysinfo()->ramoops_buffer_size, 0x20000); |
| |
| return 0; |
| } |
| |
| INIT_FUNC(ramoops_init); |