rsio.c

h内核

	buffer += 2;

	/*
	 * Set the Range maximum base address
	 */
	temp16 = (u16) linked_list->data.io.max_base_address;

	ACPI_MOVE_16_TO_16 (buffer, &temp16);
	buffer += 2;

	/*
	 * Set the base alignment
	 */
	temp8 = (u8) linked_list->data.io.alignment;

	*buffer = temp8;
	buffer += 1;

	/*
	 * Set the range length
	 */
	temp8 = (u8) linked_list->data.io.range_length;

	*buffer = temp8;
	buffer += 1;

	/*
	 * Return the number of bytes consumed in this operation
	 */
	*bytes_consumed = ACPI_PTR_DIFF (buffer, *output_buffer);
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_fixed_io_stream
 *
 * PARAMETERS:  linked_list             - Pointer to the resource linked list
 *              output_buffer           - Pointer to the user's return buffer
 *              bytes_consumed          - Pointer to where the number of bytes
 *                                        used in the output_buffer is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Take the linked list resource structure and fills in the
 *              the appropriate bytes in a byte stream
 *
 ******************************************************************************/

acpi_status
acpi_rs_fixed_io_stream (
	struct acpi_resource            *linked_list,
	u8                              **output_buffer,
	acpi_size                       *bytes_consumed)
{
	u8                              *buffer = *output_buffer;
	u16                             temp16 = 0;
	u8                              temp8 = 0;


	ACPI_FUNCTION_TRACE ("rs_fixed_io_stream");


	/*
	 * The descriptor field is static
	 */
	*buffer = 0x4B;

	buffer += 1;

	/*
	 * Set the Range base address
	 */
	temp16 = (u16) linked_list->data.fixed_io.base_address;

	ACPI_MOVE_16_TO_16 (buffer, &temp16);
	buffer += 2;

	/*
	 * Set the range length
	 */
	temp8 = (u8) linked_list->data.fixed_io.range_length;

	*buffer = temp8;
	buffer += 1;

	/*
	 * Return the number of bytes consumed in this operation
	 */
	*bytes_consumed = ACPI_PTR_DIFF (buffer, *output_buffer);
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_dma_resource
 *
 * PARAMETERS:  byte_stream_buffer      - Pointer to the resource input byte
 *                                        stream
 *              bytes_consumed          - Pointer to where the number of bytes
 *                                        consumed the byte_stream_buffer is
 *                                        returned
 *              output_buffer           - Pointer to the return data buffer
 *              structure_size          - Pointer to where the number of bytes
 *                                        in the return data struct is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Take the resource byte stream and fill out the appropriate
 *              structure pointed to by the output_buffer. Return the
 *              number of bytes consumed from the byte stream.
 *
 ******************************************************************************/

acpi_status
acpi_rs_dma_resource (
	u8                              *byte_stream_buffer,
	acpi_size                       *bytes_consumed,
	u8                              **output_buffer,
	acpi_size                       *structure_size)
{
	u8                              *buffer = byte_stream_buffer;
	struct acpi_resource            *output_struct = (void *) *output_buffer;
	u8                              temp8 = 0;
	u8                              index;
	u8                              i;
	acpi_size                       struct_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_dma);


	ACPI_FUNCTION_TRACE ("rs_dma_resource");


	/*
	 * The number of bytes consumed are Constant
	 */
	*bytes_consumed = 3;
	output_struct->id = ACPI_RSTYPE_DMA;

	/*
	 * Point to the 8-bits of Byte 1
	 */
	buffer += 1;
	temp8 = *buffer;

	/* Decode the DMA channel bits */

	for (i = 0, index = 0; index < 8; index++) {
		if ((temp8 >> index) & 0x01) {
			output_struct->data.dma.channels[i] = index;
			i++;
		}
	}

	/* Zero DMA channels is valid */

	output_struct->data.dma.number_of_channels = i;
	if (i > 0) {
		/*
		 * Calculate the structure size based upon the number of interrupts
		 */
		struct_size += ((acpi_size) i - 1) * 4;
	}

	/*
	 * Point to Byte 2
	 */
	buffer += 1;
	temp8 = *buffer;

	/*
	 * Check for transfer preference (Bits[1:0])
	 */
	output_struct->data.dma.transfer = temp8 & 0x03;

	if (0x03 == output_struct->data.dma.transfer) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid DMA.Transfer preference (3)\n"));
		return_ACPI_STATUS (AE_BAD_DATA);
	}

	/*
	 * Get bus master preference (Bit[2])
	 */
	output_struct->data.dma.bus_master = (temp8 >> 2) & 0x01;

	/*
	 * Get channel speed support (Bits[6:5])
	 */
	output_struct->data.dma.type = (temp8 >> 5) & 0x03;

	/*
	 * Set the Length parameter
	 */
	output_struct->length = (u32) struct_size;

	/*
	 * Return the final size of the structure
	 */
	*structure_size = struct_size;
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_dma_stream
 *
 * PARAMETERS:  linked_list             - Pointer to the resource linked list
 *              output_buffer           - Pointer to the user's return buffer
 *              bytes_consumed          - Pointer to where the number of bytes
 *                                        used in the output_buffer is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Take the linked list resource structure and fills in the
 *              the appropriate bytes in a byte stream
 *
 ******************************************************************************/

acpi_status
acpi_rs_dma_stream (
	struct acpi_resource            *linked_list,
	u8                              **output_buffer,
	acpi_size                       *bytes_consumed)
{
	u8                              *buffer = *output_buffer;
	u16                             temp16 = 0;
	u8                              temp8 = 0;
	u8                              index;


	ACPI_FUNCTION_TRACE ("rs_dma_stream");


	/*
	 * The descriptor field is static
	 */
	*buffer = 0x2A;
	buffer += 1;
	temp8 = 0;

	/*
	 * Loop through all of the Channels and set the mask bits
	 */
	for (index = 0;
		 index < linked_list->data.dma.number_of_channels;
		 index++) {
		temp16 = (u16) linked_list->data.dma.channels[index];
		temp8 |= 0x1 << temp16;
	}

	*buffer = temp8;
	buffer += 1;

	/*
	 * Set the DMA Info
	 */
	temp8 = (u8) ((linked_list->data.dma.type & 0x03) << 5);
	temp8 |= ((linked_list->data.dma.bus_master & 0x01) << 2);
	temp8 |= (linked_list->data.dma.transfer & 0x03);

	*buffer = temp8;
	buffer += 1;

	/*
	 * Return the number of bytes consumed in this operation
	 */
	*bytes_consumed = ACPI_PTR_DIFF (buffer, *output_buffer);
	return_ACPI_STATUS (AE_OK);
}