kernel/drivers/acpi/acpica/dbhistry.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dbhistry - debugger HISTORY command
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acdebug.h"
  47
  48 #define _COMPONENT          ACPI_CA_DEBUGGER
  49 ACPI_MODULE_NAME("dbhistry")
  50
  51 #define HI_NO_HISTORY       0
  52 #define HI_RECORD_HISTORY   1
  53 #define HISTORY_SIZE        40
  54 typedef struct history_info {
  55         char *command;
  56         u32 cmd_num;
  57
  58 } HISTORY_INFO;
  59
  60 static HISTORY_INFO acpi_gbl_history_buffer[HISTORY_SIZE];
  61 static u16 acpi_gbl_lo_history = 0;
  62 static u16 acpi_gbl_num_history = 0;
  63 static u16 acpi_gbl_next_history_index = 0;
  64 u32 acpi_gbl_next_cmd_num = 1;
  65
  66 /*******************************************************************************
  67  *
  68  * FUNCTION:    acpi_db_add_to_history
  69  *
  70  * PARAMETERS:  command_line    - Command to add
  71  *
  72  * RETURN:      None
  73  *
  74  * DESCRIPTION: Add a command line to the history buffer.
  75  *
  76  ******************************************************************************/
  77
  78 void acpi_db_add_to_history(char *command_line)
  79 {
  80         u16 cmd_len;
  81         u16 buffer_len;
  82
  83         /* Put command into the next available slot */
  84
  85         cmd_len = (u16)strlen(command_line);
  86         if (!cmd_len) {
  87                 return;
  88         }
  89
  90         if (acpi_gbl_history_buffer[acpi_gbl_next_history_index].command !=
  91             NULL) {
  92                 buffer_len =
  93                     (u16)
  94                     strlen(acpi_gbl_history_buffer[acpi_gbl_next_history_index].
  95                            command);
  96
  97                 if (cmd_len > buffer_len) {
  98                         acpi_os_free(acpi_gbl_history_buffer
  99                                      [acpi_gbl_next_history_index].command);
 100                         acpi_gbl_history_buffer[acpi_gbl_next_history_index].
 101                             command = acpi_os_allocate(cmd_len + 1);
 102                 }
 103         } else {
 104                 acpi_gbl_history_buffer[acpi_gbl_next_history_index].command =
 105                     acpi_os_allocate(cmd_len + 1);
 106         }
 107
 108         strcpy(acpi_gbl_history_buffer[acpi_gbl_next_history_index].command,
 109                command_line);
 110
 111         acpi_gbl_history_buffer[acpi_gbl_next_history_index].cmd_num =
 112             acpi_gbl_next_cmd_num;
 113
 114         /* Adjust indexes */
 115
 116         if ((acpi_gbl_num_history == HISTORY_SIZE) &&
 117             (acpi_gbl_next_history_index == acpi_gbl_lo_history)) {
 118                 acpi_gbl_lo_history++;
 119                 if (acpi_gbl_lo_history >= HISTORY_SIZE) {
 120                         acpi_gbl_lo_history = 0;
 121                 }
 122         }
 123
 124         acpi_gbl_next_history_index++;
 125         if (acpi_gbl_next_history_index >= HISTORY_SIZE) {
 126                 acpi_gbl_next_history_index = 0;
 127         }
 128
 129         acpi_gbl_next_cmd_num++;
 130         if (acpi_gbl_num_history < HISTORY_SIZE) {
 131                 acpi_gbl_num_history++;
 132         }
 133 }
 134
 135 /*******************************************************************************
 136  *
 137  * FUNCTION:    acpi_db_display_history
 138  *
 139  * PARAMETERS:  None
 140  *
 141  * RETURN:      None
 142  *
 143  * DESCRIPTION: Display the contents of the history buffer
 144  *
 145  ******************************************************************************/
 146
 147 void acpi_db_display_history(void)
 148 {
 149         u32 i;
 150         u16 history_index;
 151
 152         history_index = acpi_gbl_lo_history;
 153
 154         /* Dump entire history buffer */
 155
 156         for (i = 0; i < acpi_gbl_num_history; i++) {
 157                 if (acpi_gbl_history_buffer[history_index].command) {
 158                         acpi_os_printf("%3ld %s\n",
 159                                        acpi_gbl_history_buffer[history_index].
 160                                        cmd_num,
 161                                        acpi_gbl_history_buffer[history_index].
 162                                        command);
 163                 }
 164
 165                 history_index++;
 166                 if (history_index >= HISTORY_SIZE) {
 167                         history_index = 0;
 168                 }
 169         }
 170 }
 171
 172 /*******************************************************************************
 173  *
 174  * FUNCTION:    acpi_db_get_from_history
 175  *
 176  * PARAMETERS:  command_num_arg         - String containing the number of the
 177  *                                        command to be retrieved
 178  *
 179  * RETURN:      Pointer to the retrieved command. Null on error.
 180  *
 181  * DESCRIPTION: Get a command from the history buffer
 182  *
 183  ******************************************************************************/
 184
 185 char *acpi_db_get_from_history(char *command_num_arg)
 186 {
 187         u32 cmd_num;
 188
 189         if (command_num_arg == NULL) {
 190                 cmd_num = acpi_gbl_next_cmd_num - 1;
 191         }
 192
 193         else {
 194                 cmd_num = strtoul(command_num_arg, NULL, 0);
 195         }
 196
 197         return (acpi_db_get_history_by_index(cmd_num));
 198 }
 199
 200 /*******************************************************************************
 201  *
 202  * FUNCTION:    acpi_db_get_history_by_index
 203  *
 204  * PARAMETERS:  cmd_num             - Index of the desired history entry.
 205  *                                    Values are 0...(acpi_gbl_next_cmd_num - 1)
 206  *
 207  * RETURN:      Pointer to the retrieved command. Null on error.
 208  *
 209  * DESCRIPTION: Get a command from the history buffer
 210  *
 211  ******************************************************************************/
 212
 213 char *acpi_db_get_history_by_index(u32 cmd_num)
 214 {
 215         u32 i;
 216         u16 history_index;
 217
 218         /* Search history buffer */
 219
 220         history_index = acpi_gbl_lo_history;
 221         for (i = 0; i < acpi_gbl_num_history; i++) {
 222                 if (acpi_gbl_history_buffer[history_index].cmd_num == cmd_num) {
 223
 224                         /* Found the command, return it */
 225
 226                         return (acpi_gbl_history_buffer[history_index].command);
 227                 }
 228
 229                 /* History buffer is circular */
 230
 231                 history_index++;
 232                 if (history_index >= HISTORY_SIZE) {
 233                         history_index = 0;
 234                 }
 235         }
 236
 237         acpi_os_printf("Invalid history number: %u\n", history_index);
 238         return (NULL);
 239 }