xref: /kernel/linux/linux-6.6/drivers/acpi/acpica/utexcep.c

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
 *
 * Module Name: utexcep - Exception code support
 *
 ******************************************************************************/

#define EXPORT_ACPI_INTERFACES

#define ACPI_DEFINE_EXCEPTION_TABLE
#include <acpi/acpi.h>
#include "accommon.h"

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utexcep")

/*******************************************************************************
 *
 * FUNCTION:    acpi_format_exception
 *
 * PARAMETERS:  status              - The acpi_status code to be formatted
 *
 * RETURN:      A string containing the exception text. A valid pointer is
 *              always returned.
 *
 * DESCRIPTION: This function translates an ACPI exception into an ASCII
 *              string. Returns "unknown status" string for invalid codes.
 *
 ******************************************************************************/
const char *acpi_format_exception(acpi_status status)
{
	const struct acpi_exception_info *exception;

	ACPI_FUNCTION_ENTRY();

	exception = acpi_ut_validate_exception(status);
	if (!exception) {

		/* Exception code was not recognized */

		ACPI_ERROR((AE_INFO,
			    "Unknown exception code: 0x%8.8X", status));

		return ("UNKNOWN_STATUS_CODE");
	}

	return (exception->name);
}

ACPI_EXPORT_SYMBOL(acpi_format_exception)

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_validate_exception
 *
 * PARAMETERS:  status              - The acpi_status code to be formatted
 *
 * RETURN:      A string containing the exception text. NULL if exception is
 *              not valid.
 *
 * DESCRIPTION: This function validates and translates an ACPI exception into
 *              an ASCII string.
 *
 ******************************************************************************/
const struct acpi_exception_info *acpi_ut_validate_exception(acpi_status status)
{
	u32 sub_status;
	const struct acpi_exception_info *exception = NULL;

	ACPI_FUNCTION_ENTRY();

	/*
	 * Status is composed of two parts, a "type" and an actual code
	 */
	sub_status = (status & ~AE_CODE_MASK);

	switch (status & AE_CODE_MASK) {
	case AE_CODE_ENVIRONMENTAL:

		if (sub_status <= AE_CODE_ENV_MAX) {
			exception = &acpi_gbl_exception_names_env[sub_status];
		}
		break;

	case AE_CODE_PROGRAMMER:

		if (sub_status <= AE_CODE_PGM_MAX) {
			exception = &acpi_gbl_exception_names_pgm[sub_status];
		}
		break;

	case AE_CODE_ACPI_TABLES:

		if (sub_status <= AE_CODE_TBL_MAX) {
			exception = &acpi_gbl_exception_names_tbl[sub_status];
		}
		break;

	case AE_CODE_AML:

		if (sub_status <= AE_CODE_AML_MAX) {
			exception = &acpi_gbl_exception_names_aml[sub_status];
		}
		break;

	case AE_CODE_CONTROL:

		if (sub_status <= AE_CODE_CTRL_MAX) {
			exception = &acpi_gbl_exception_names_ctrl[sub_status];
		}
		break;

	default:

		break;
	}

	if (!exception || !exception->name) {
		return (NULL);
	}

	return (exception);
}