xref: /openbmc/linux/drivers/acpi/acpica/dbhistry.c (revision 407e7517)
1 /******************************************************************************
2  *
3  * Module Name: dbhistry - debugger HISTORY command
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2018, 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 }
240