1 /* 2 * Copyright (C) 2010 Marco Stornelli <[email protected]> 3 * Copyright (C) 2011 Kees Cook <[email protected]> 4 * Copyright (C) 2011 Google, Inc. 5 * 6 * This software is licensed under the terms of the GNU General Public 7 * License version 2, as published by the Free Software Foundation, and 8 * may be copied, distributed, and modified under those terms. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 */ 16 17 #ifndef __LINUX_PSTORE_RAM_H__ 18 #define __LINUX_PSTORE_RAM_H__ 19 20 #include <linux/device.h> 21 #include <linux/kernel.h> 22 #include <linux/list.h> 23 #include <linux/types.h> 24 #include <linux/init.h> 25 26 struct persistent_ram_buffer; 27 28 struct persistent_ram_descriptor { 29 const char *name; 30 phys_addr_t size; 31 }; 32 33 struct persistent_ram { 34 phys_addr_t start; 35 phys_addr_t size; 36 37 int num_descs; 38 struct persistent_ram_descriptor *descs; 39 40 struct list_head node; 41 }; 42 43 struct persistent_ram_zone { 44 phys_addr_t paddr; 45 size_t size; 46 void *vaddr; 47 struct persistent_ram_buffer *buffer; 48 size_t buffer_size; 49 50 /* ECC correction */ 51 bool ecc; 52 char *par_buffer; 53 char *par_header; 54 struct rs_control *rs_decoder; 55 int corrected_bytes; 56 int bad_blocks; 57 int ecc_block_size; 58 int ecc_size; 59 int ecc_symsize; 60 int ecc_poly; 61 62 char *old_log; 63 size_t old_log_size; 64 }; 65 66 int persistent_ram_early_init(struct persistent_ram *ram); 67 68 struct persistent_ram_zone * __init persistent_ram_new(phys_addr_t start, 69 size_t size, 70 bool ecc); 71 void persistent_ram_free(struct persistent_ram_zone *prz); 72 struct persistent_ram_zone *persistent_ram_init_ringbuffer(struct device *dev, 73 bool ecc); 74 75 int persistent_ram_write(struct persistent_ram_zone *prz, const void *s, 76 unsigned int count); 77 78 size_t persistent_ram_old_size(struct persistent_ram_zone *prz); 79 void *persistent_ram_old(struct persistent_ram_zone *prz); 80 void persistent_ram_free_old(struct persistent_ram_zone *prz); 81 ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz, 82 char *str, size_t len); 83 84 /* 85 * Ramoops platform data 86 * @mem_size memory size for ramoops 87 * @mem_address physical memory address to contain ramoops 88 */ 89 90 struct ramoops_platform_data { 91 unsigned long mem_size; 92 unsigned long mem_address; 93 unsigned long record_size; 94 int dump_oops; 95 bool ecc; 96 }; 97 98 #endif 99