cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/dbhistry.c

/******************************************************************************
 *
 * Module Name: dbhistry - debugger HISTORY command
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acdebug.h"


#define _COMPONENT          ACPI_CA_DEBUGGER
ACPI_MODULE_NAME("dbhistry")


#define HI_NO_HISTORY       0

#define HI_RECORD_HISTORY   1

#define HISTORY_SIZE        40

typedef struct history_info {
	
char *command;
	
u32 cmd_num;

} 
HISTORY_INFO;


static HISTORY_INFO acpi_gbl_history_buffer[HISTORY_SIZE];

static u16 acpi_gbl_lo_history = 0;

static u16 acpi_gbl_num_history = 0;

static u16 acpi_gbl_next_history_index = 0;

u32 acpi_gbl_next_cmd_num = 1;

/*******************************************************************************
 *
 * FUNCTION:    acpi_db_add_to_history
 *
 * PARAMETERS:  command_line    - Command to add
 *
 * RETURN:      None
 *
 * DESCRIPTION: Add a command line to the history buffer.
 *
 ******************************************************************************/


void acpi_db_add_to_history(char *command_line) { u16 cmd_len; u16 buffer_len; /* Put command into the next available slot */ cmd_len = (u16)strlen(command_line); if (!cmd_len) { return; } if (acpi_gbl_history_buffer[acpi_gbl_next_history_index].command != NULL) { buffer_len = (u16) strlen(acpi_gbl_history_buffer[acpi_gbl_next_history_index]. command); if (cmd_len > buffer_len) { acpi_os_free(acpi_gbl_history_buffer [acpi_gbl_next_history_index].command); acpi_gbl_history_buffer[acpi_gbl_next_history_index]. command = acpi_os_allocate(cmd_len + 1); } } else { acpi_gbl_history_buffer[acpi_gbl_next_history_index].command = acpi_os_allocate(cmd_len + 1); } strcpy(acpi_gbl_history_buffer[acpi_gbl_next_history_index].command, command_line); acpi_gbl_history_buffer[acpi_gbl_next_history_index].cmd_num = acpi_gbl_next_cmd_num; /* Adjust indexes */ if ((acpi_gbl_num_history == HISTORY_SIZE) && (acpi_gbl_next_history_index == acpi_gbl_lo_history)) { acpi_gbl_lo_history++; if (acpi_gbl_lo_history >= HISTORY_SIZE) { acpi_gbl_lo_history = 0; } } acpi_gbl_next_history_index++; if (acpi_gbl_next_history_index >= HISTORY_SIZE) { acpi_gbl_next_history_index = 0; } acpi_gbl_next_cmd_num++; if (acpi_gbl_num_history < HISTORY_SIZE) { acpi_gbl_num_history++; } }

Contributors

PersonTokensPropCommitsCommitProp
Lv Zheng193100.00%1100.00%
Total193100.00%1100.00%

/******************************************************************************* * * FUNCTION: acpi_db_display_history * * PARAMETERS: None * * RETURN: None * * DESCRIPTION: Display the contents of the history buffer * ******************************************************************************/
void acpi_db_display_history(void) { u32 i; u16 history_index; history_index = acpi_gbl_lo_history; /* Dump entire history buffer */ for (i = 0; i < acpi_gbl_num_history; i++) { if (acpi_gbl_history_buffer[history_index].command) { acpi_os_printf("%3ld %s\n", acpi_gbl_history_buffer[history_index]. cmd_num, acpi_gbl_history_buffer[history_index]. command); } history_index++; if (history_index >= HISTORY_SIZE) { history_index = 0; } } }

Contributors

PersonTokensPropCommitsCommitProp
Lv Zheng78100.00%1100.00%
Total78100.00%1100.00%

/******************************************************************************* * * FUNCTION: acpi_db_get_from_history * * PARAMETERS: command_num_arg - String containing the number of the * command to be retrieved * * RETURN: Pointer to the retrieved command. Null on error. * * DESCRIPTION: Get a command from the history buffer * ******************************************************************************/
char *acpi_db_get_from_history(char *command_num_arg) { u32 cmd_num; if (command_num_arg == NULL) { cmd_num = acpi_gbl_next_cmd_num - 1; } else { cmd_num = strtoul(command_num_arg, NULL, 0); } return (acpi_db_get_history_by_index(cmd_num)); }

Contributors

PersonTokensPropCommitsCommitProp
Lv Zheng49100.00%1100.00%
Total49100.00%1100.00%

/******************************************************************************* * * FUNCTION: acpi_db_get_history_by_index * * PARAMETERS: cmd_num - Index of the desired history entry. * Values are 0...(acpi_gbl_next_cmd_num - 1) * * RETURN: Pointer to the retrieved command. Null on error. * * DESCRIPTION: Get a command from the history buffer * ******************************************************************************/
char *acpi_db_get_history_by_index(u32 cmd_num) { u32 i; u16 history_index; /* Search history buffer */ history_index = acpi_gbl_lo_history; for (i = 0; i < acpi_gbl_num_history; i++) { if (acpi_gbl_history_buffer[history_index].cmd_num == cmd_num) { /* Found the command, return it */ return (acpi_gbl_history_buffer[history_index].command); } /* History buffer is circular */ history_index++; if (history_index >= HISTORY_SIZE) { history_index = 0; } } acpi_os_printf("Invalid history number: %u\n", history_index); return (NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Lv Zheng87100.00%1100.00%
Total87100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Lv Zheng48599.79%150.00%
Robert Moore10.21%150.00%
Total486100.00%2100.00%
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