drivers/acpi/acpica/exmisc.c

Source file repositories/reference/linux-study-clean/drivers/acpi/acpica/exmisc.c

File Facts

System
Linux kernel
Corpus path
drivers/acpi/acpica/exmisc.c
Extension
.c
Size
11917 bytes
Lines
452
Domain
Driver Families
Bucket
drivers/acpi
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (obj_desc->common.type != ACPI_TYPE_LOCAL_REFERENCE) {
			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}

		/*
		 * Must be a reference to a Local or Arg
		 */
		switch (obj_desc->reference.class) {
		case ACPI_REFCLASS_LOCAL:
		case ACPI_REFCLASS_ARG:
		case ACPI_REFCLASS_DEBUG:

			/* The referenced object is the pseudo-node for the local/arg */

			referenced_obj = obj_desc->reference.object;
			break;

		default:

			ACPI_ERROR((AE_INFO, "Invalid Reference Class 0x%2.2X",
				    obj_desc->reference.class));
			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}
		break;

	case ACPI_DESC_TYPE_NAMED:
		/*
		 * A named reference that has already been resolved to a Node
		 */
		referenced_obj = obj_desc;
		break;

	default:

		ACPI_ERROR((AE_INFO, "Invalid descriptor type 0x%X",
			    ACPI_GET_DESCRIPTOR_TYPE(obj_desc)));
		return_ACPI_STATUS(AE_TYPE);
	}

	/* Create a new reference object */

	reference_obj =
	    acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
	if (!reference_obj) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	reference_obj->reference.class = ACPI_REFCLASS_REFOF;
	reference_obj->reference.object = referenced_obj;
	*return_desc = reference_obj;

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
			  "Object %p Type [%s], returning Reference %p\n",
			  obj_desc, acpi_ut_get_object_type_name(obj_desc),
			  *return_desc));

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_do_math_op
 *
 * PARAMETERS:  opcode              - AML opcode
 *              integer0            - Integer operand #0
 *              integer1            - Integer operand #1
 *
 * RETURN:      Integer result of the operation
 *
 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
 *              math functions here is to prevent a lot of pointer dereferencing
 *              to obtain the operands.
 *
 ******************************************************************************/

u64 acpi_ex_do_math_op(u16 opcode, u64 integer0, u64 integer1)
{

	ACPI_FUNCTION_ENTRY();

	switch (opcode) {
	case AML_ADD_OP:	/* Add (Integer0, Integer1, Result) */

		return (integer0 + integer1);

	case AML_BIT_AND_OP:	/* And (Integer0, Integer1, Result) */

		return (integer0 & integer1);

	case AML_BIT_NAND_OP:	/* NAnd (Integer0, Integer1, Result) */

Annotation

Implementation Notes