Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 850 insertions, 0 deletions

diff --git a/drivers/acpi/hardware/hwregs.c b/drivers/acpi/hardware/hwregs.c
new file mode 100644
index 00000000000..91af0c2ddcf
--- /dev/null
+++ b/drivers/acpi/hardware/hwregs.c
@@ -0,0 +1,850 @@
+
+/*******************************************************************************
+ *
+ * Module Name: hwregs - Read/write access functions for the various ACPI
+ *                       control and status registers.
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, R. Byron Moore
+ * 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 <linux/module.h>
+
+#include <acpi/acpi.h>
+#include <acpi/acnamesp.h>
+#include <acpi/acevents.h>
+
+#define _COMPONENT          ACPI_HARDWARE
+	 ACPI_MODULE_NAME    ("hwregs")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_clear_acpi_status
+ *
+ * PARAMETERS:  Flags           - Lock the hardware or not
+ *
+ * RETURN:      none
+ *
+ * DESCRIPTION: Clears all fixed and general purpose status bits
+ *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_hw_clear_acpi_status (
+	u32                             flags)
+{
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("hw_clear_acpi_status");
+
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %04X to %04X\n",
+		ACPI_BITMASK_ALL_FIXED_STATUS,
+		(u16) acpi_gbl_FADT->xpm1a_evt_blk.address));
+
+	if (flags & ACPI_MTX_LOCK) {
+		status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
+		if (ACPI_FAILURE (status)) {
+			return_ACPI_STATUS (status);
+		}
+	}
+
+	status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_STATUS,
+			  ACPI_BITMASK_ALL_FIXED_STATUS);
+	if (ACPI_FAILURE (status)) {
+		goto unlock_and_exit;
+	}
+
+	/* Clear the fixed events */
+
+	if (acpi_gbl_FADT->xpm1b_evt_blk.address) {
+		status = acpi_hw_low_level_write (16, ACPI_BITMASK_ALL_FIXED_STATUS,
+				 &acpi_gbl_FADT->xpm1b_evt_blk);
+		if (ACPI_FAILURE (status)) {
+			goto unlock_and_exit;
+		}
+	}
+
+	/* Clear the GPE Bits in all GPE registers in all GPE blocks */
+
+	status = acpi_ev_walk_gpe_list (acpi_hw_clear_gpe_block, ACPI_ISR);
+
+unlock_and_exit:
+	if (flags & ACPI_MTX_LOCK) {
+		(void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
+	}
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_sleep_type_data
+ *
+ * PARAMETERS:  sleep_state         - Numeric sleep state
+ *              *sleep_type_a        - Where SLP_TYPa is returned
+ *              *sleep_type_b        - Where SLP_TYPb is returned
+ *
+ * RETURN:      Status - ACPI status
+ *
+ * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
+ *              state.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_get_sleep_type_data (
+	u8                              sleep_state,
+	u8                              *sleep_type_a,
+	u8                              *sleep_type_b)
+{
+	acpi_status                     status = AE_OK;
+	struct acpi_parameter_info      info;
+
+
+	ACPI_FUNCTION_TRACE ("acpi_get_sleep_type_data");
+
+
+	/*
+	 * Validate parameters
+	 */
+	if ((sleep_state > ACPI_S_STATES_MAX) ||
+		!sleep_type_a || !sleep_type_b) {
+		return_ACPI_STATUS (AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * Evaluate the namespace object containing the values for this state
+	 */
+	info.parameters = NULL;
+	status = acpi_ns_evaluate_by_name ((char *) acpi_gbl_sleep_state_names[sleep_state],
+			  &info);
+	if (ACPI_FAILURE (status)) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s while evaluating sleep_state [%s]\n",
+			acpi_format_exception (status), acpi_gbl_sleep_state_names[sleep_state]));
+
+		return_ACPI_STATUS (status);
+	}
+
+	/* Must have a return object */
+
+	if (!info.return_object) {
+		ACPI_REPORT_ERROR (("Missing Sleep State object\n"));
+		status = AE_NOT_EXIST;
+	}
+
+	/* It must be of type Package */
+
+	else if (ACPI_GET_OBJECT_TYPE (info.return_object) != ACPI_TYPE_PACKAGE) {
+		ACPI_REPORT_ERROR (("Sleep State object not a Package\n"));
+		status = AE_AML_OPERAND_TYPE;
+	}
+
+	/* The package must have at least two elements */
+
+	else if (info.return_object->package.count < 2) {
+		ACPI_REPORT_ERROR (("Sleep State package does not have at least two elements\n"));
+		status = AE_AML_NO_OPERAND;
+	}
+
+	/* The first two elements must both be of type Integer */
+
+	else if ((ACPI_GET_OBJECT_TYPE (info.return_object->package.elements[0]) != ACPI_TYPE_INTEGER) ||
+			 (ACPI_GET_OBJECT_TYPE (info.return_object->package.elements[1]) != ACPI_TYPE_INTEGER)) {
+		ACPI_REPORT_ERROR (("Sleep State package elements are not both Integers (%s, %s)\n",
+			acpi_ut_get_object_type_name (info.return_object->package.elements[0]),
+			acpi_ut_get_object_type_name (info.return_object->package.elements[1])));
+		status = AE_AML_OPERAND_TYPE;
+	}
+	else {
+		/*
+		 * Valid _Sx_ package size, type, and value
+		 */
+		*sleep_type_a = (u8) (info.return_object->package.elements[0])->integer.value;
+		*sleep_type_b = (u8) (info.return_object->package.elements[1])->integer.value;
+	}
+
+	if (ACPI_FAILURE (status)) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+			"While evaluating sleep_state [%s], bad Sleep object %p type %s\n",
+			acpi_gbl_sleep_state_names[sleep_state], info.return_object,
+			acpi_ut_get_object_type_name (info.return_object)));
+	}
+
+	acpi_ut_remove_reference (info.return_object);
+	return_ACPI_STATUS (status);
+}
+EXPORT_SYMBOL(acpi_get_sleep_type_data);
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_get_register_bit_mask
+ *
+ * PARAMETERS:  register_id         - Index of ACPI Register to access
+ *
+ * RETURN:      The bit mask to be used when accessing the register
+ *
+ * DESCRIPTION: Map register_id into a register bit mask.
+ *
+ ******************************************************************************/
+
+struct acpi_bit_register_info *
+acpi_hw_get_bit_register_info (
+	u32                             register_id)
+{
+	ACPI_FUNCTION_NAME ("hw_get_bit_register_info");
+
+
+	if (register_id > ACPI_BITREG_MAX) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid bit_register ID: %X\n", register_id));
+		return (NULL);
+	}
+
+	return (&acpi_gbl_bit_register_info[register_id]);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_register
+ *
+ * PARAMETERS:  register_id     - ID of ACPI bit_register to access
+ *              return_value    - Value that was read from the register
+ *              Flags           - Lock the hardware or not
+ *
+ * RETURN:      Status and the value read from specified Register.  Value
+ *              returned is normalized to bit0 (is shifted all the way right)
+ *
+ * DESCRIPTION: ACPI bit_register read function.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_get_register (
+	u32                             register_id,
+	u32                             *return_value,
+	u32                             flags)
+{
+	u32                             register_value = 0;
+	struct acpi_bit_register_info   *bit_reg_info;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("acpi_get_register");
+
+
+	/* Get the info structure corresponding to the requested ACPI Register */
+
+	bit_reg_info = acpi_hw_get_bit_register_info (register_id);
+	if (!bit_reg_info) {
+		return_ACPI_STATUS (AE_BAD_PARAMETER);
+	}
+
+	if (flags & ACPI_MTX_LOCK) {
+		status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
+		if (ACPI_FAILURE (status)) {
+			return_ACPI_STATUS (status);
+		}
+	}
+
+	/* Read from the register */
+
+	status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
+			  bit_reg_info->parent_register, &register_value);
+
+	if (flags & ACPI_MTX_LOCK) {
+		(void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
+	}
+
+	if (ACPI_SUCCESS (status)) {
+		/* Normalize the value that was read */
+
+		register_value = ((register_value & bit_reg_info->access_bit_mask)
+				   >> bit_reg_info->bit_position);
+
+		*return_value = register_value;
+
+		ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Read value %8.8X register %X\n",
+				register_value, bit_reg_info->parent_register));
+	}
+
+	return_ACPI_STATUS (status);
+}
+EXPORT_SYMBOL(acpi_get_register);
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_set_register
+ *
+ * PARAMETERS:  register_id     - ID of ACPI bit_register to access
+ *              Value           - (only used on write) value to write to the
+ *                                Register, NOT pre-normalized to the bit pos
+ *              Flags           - Lock the hardware or not
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: ACPI Bit Register write function.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_set_register (
+	u32                             register_id,
+	u32                             value,
+	u32                             flags)
+{
+	u32                             register_value = 0;
+	struct acpi_bit_register_info   *bit_reg_info;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE_U32 ("acpi_set_register", register_id);
+
+
+	/* Get the info structure corresponding to the requested ACPI Register */
+
+	bit_reg_info = acpi_hw_get_bit_register_info (register_id);
+	if (!bit_reg_info) {
+		ACPI_REPORT_ERROR (("Bad ACPI HW register_id: %X\n", register_id));
+		return_ACPI_STATUS (AE_BAD_PARAMETER);
+	}
+
+	if (flags & ACPI_MTX_LOCK) {
+		status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
+		if (ACPI_FAILURE (status)) {
+			return_ACPI_STATUS (status);
+		}
+	}
+
+	/* Always do a register read first so we can insert the new bits  */
+
+	status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
+			  bit_reg_info->parent_register, &register_value);
+	if (ACPI_FAILURE (status)) {
+		goto unlock_and_exit;
+	}
+
+	/*
+	 * Decode the Register ID
+	 * Register ID = [Register block ID] | [bit ID]
+	 *
+	 * Check bit ID to fine locate Register offset.
+	 * Check Mask to determine Register offset, and then read-write.
+	 */
+	switch (bit_reg_info->parent_register) {
+	case ACPI_REGISTER_PM1_STATUS:
+
+		/*
+		 * Status Registers are different from the rest.  Clear by
+		 * writing 1, and writing 0 has no effect.  So, the only relevant
+		 * information is the single bit we're interested in, all others should
+		 * be written as 0 so they will be left unchanged.
+		 */
+		value = ACPI_REGISTER_PREPARE_BITS (value,
+				 bit_reg_info->bit_position, bit_reg_info->access_bit_mask);
+		if (value) {
+			status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
+					 ACPI_REGISTER_PM1_STATUS, (u16) value);
+			register_value = 0;
+		}
+		break;
+
+
+	case ACPI_REGISTER_PM1_ENABLE:
+
+		ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
+				bit_reg_info->access_bit_mask, value);
+
+		status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
+				  ACPI_REGISTER_PM1_ENABLE, (u16) register_value);
+		break;
+
+
+	case ACPI_REGISTER_PM1_CONTROL:
+
+		/*
+		 * Write the PM1 Control register.
+		 * Note that at this level, the fact that there are actually TWO
+		 * registers (A and B - and B may not exist) is abstracted.
+		 */
+		ACPI_DEBUG_PRINT ((ACPI_DB_IO, "PM1 control: Read %X\n", register_value));
+
+		ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
+				bit_reg_info->access_bit_mask, value);
+
+		status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
+				  ACPI_REGISTER_PM1_CONTROL, (u16) register_value);
+		break;
+
+
+	case ACPI_REGISTER_PM2_CONTROL:
+
+		status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
+				 ACPI_REGISTER_PM2_CONTROL, &register_value);
+		if (ACPI_FAILURE (status)) {
+			goto unlock_and_exit;
+		}
+
+		ACPI_DEBUG_PRINT ((ACPI_DB_IO, "PM2 control: Read %X from %8.8X%8.8X\n",
+			register_value,
+			ACPI_FORMAT_UINT64 (acpi_gbl_FADT->xpm2_cnt_blk.address)));
+
+		ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
+				bit_reg_info->access_bit_mask, value);
+
+		ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %4.4X to %8.8X%8.8X\n",
+			register_value,
+			ACPI_FORMAT_UINT64 (acpi_gbl_FADT->xpm2_cnt_blk.address)));
+
+		status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
+				   ACPI_REGISTER_PM2_CONTROL, (u8) (register_value));
+		break;
+
+
+	default:
+		break;
+	}
+
+
+unlock_and_exit:
+
+	if (flags & ACPI_MTX_LOCK) {
+		(void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
+	}
+
+	/* Normalize the value that was read */
+
+	ACPI_DEBUG_EXEC (register_value = ((register_value & bit_reg_info->access_bit_mask) >> bit_reg_info->bit_position));
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Set bits: %8.8X actual %8.8X register %X\n",
+			value, register_value, bit_reg_info->parent_register));
+	return_ACPI_STATUS (status);
+}
+EXPORT_SYMBOL(acpi_set_register);
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_register_read
+ *
+ * PARAMETERS:  use_lock            - Mutex hw access
+ *              register_id         - register_iD + Offset
+ *              return_value        - Value that was read from the register
+ *
+ * RETURN:      Status and the value read.
+ *
+ * DESCRIPTION: Acpi register read function.  Registers are read at the
+ *              given offset.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_hw_register_read (
+	u8                              use_lock,
+	u32                             register_id,
+	u32                             *return_value)
+{
+	u32                             value1 = 0;
+	u32                             value2 = 0;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("hw_register_read");
+
+
+	if (ACPI_MTX_LOCK == use_lock) {
+		status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
+		if (ACPI_FAILURE (status)) {
+			return_ACPI_STATUS (status);
+		}
+	}
+
+	switch (register_id) {
+	case ACPI_REGISTER_PM1_STATUS:           /* 16-bit access */
+
+		status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_FADT->xpm1a_evt_blk);
+		if (ACPI_FAILURE (status)) {
+			goto unlock_and_exit;
+		}
+
+		/* PM1B is optional */
+
+		status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_FADT->xpm1b_evt_blk);
+		value1 |= value2;
+		break;
+
+
+	case ACPI_REGISTER_PM1_ENABLE:           /* 16-bit access */
+
+		status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_xpm1a_enable);
+		if (ACPI_FAILURE (status)) {
+			goto unlock_and_exit;
+		}
+
+		/* PM1B is optional */
+
+		status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_xpm1b_enable);
+		value1 |= value2;
+		break;
+
+
+	case ACPI_REGISTER_PM1_CONTROL:          /* 16-bit access */
+
+		status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_FADT->xpm1a_cnt_blk);
+		if (ACPI_FAILURE (status)) {
+			goto unlock_and_exit;
+		}
+
+		status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_FADT->xpm1b_cnt_blk);
+		value1 |= value2;
+		break;
+
+
+	case ACPI_REGISTER_PM2_CONTROL:          /* 8-bit access */
+
+		status = acpi_hw_low_level_read (8, &value1, &acpi_gbl_FADT->xpm2_cnt_blk);
+		break;
+
+
+	case ACPI_REGISTER_PM_TIMER:             /* 32-bit access */
+
+		status = acpi_hw_low_level_read (32, &value1, &acpi_gbl_FADT->xpm_tmr_blk);
+		break;
+
+	case ACPI_REGISTER_SMI_COMMAND_BLOCK:    /* 8-bit access */
+
+		status = acpi_os_read_port (acpi_gbl_FADT->smi_cmd, &value1, 8);
+		break;
+
+	default:
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown Register ID: %X\n", register_id));
+		status = AE_BAD_PARAMETER;
+		break;
+	}
+
+unlock_and_exit:
+	if (ACPI_MTX_LOCK == use_lock) {
+		(void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
+	}
+
+	if (ACPI_SUCCESS (status)) {
+		*return_value = value1;
+	}
+
+	return_ACPI_STATUS (status);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_register_write
+ *
+ * PARAMETERS:  use_lock            - Mutex hw access
+ *              register_id         - register_iD + Offset
+ *              Value               - The value to write
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Acpi register Write function.  Registers are written at the
+ *              given offset.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_hw_register_write (
+	u8                              use_lock,
+	u32                             register_id,
+	u32                             value)
+{
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("hw_register_write");
+
+
+	if (ACPI_MTX_LOCK == use_lock) {
+		status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
+		if (ACPI_FAILURE (status)) {
+			return_ACPI_STATUS (status);
+		}
+	}
+
+	switch (register_id) {
+	case ACPI_REGISTER_PM1_STATUS:           /* 16-bit access */
+
+		status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_evt_blk);
+		if (ACPI_FAILURE (status)) {
+			goto unlock_and_exit;
+		}
+
+		/* PM1B is optional */
+
+		status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_evt_blk);
+		break;
+
+
+	case ACPI_REGISTER_PM1_ENABLE:           /* 16-bit access*/
+
+		status = acpi_hw_low_level_write (16, value, &acpi_gbl_xpm1a_enable);
+		if (ACPI_FAILURE (status)) {
+			goto unlock_and_exit;
+		}
+
+		/* PM1B is optional */
+
+		status = acpi_hw_low_level_write (16, value, &acpi_gbl_xpm1b_enable);
+		break;
+
+
+	case ACPI_REGISTER_PM1_CONTROL:          /* 16-bit access */
+
+		status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_cnt_blk);
+		if (ACPI_FAILURE (status)) {
+			goto unlock_and_exit;
+		}
+
+		status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_cnt_blk);
+		break;
+
+
+	case ACPI_REGISTER_PM1A_CONTROL:         /* 16-bit access */
+
+		status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_cnt_blk);
+		break;
+
+
+	case ACPI_REGISTER_PM1B_CONTROL:         /* 16-bit access */
+
+		status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_cnt_blk);
+		break;
+
+
+	case ACPI_REGISTER_PM2_CONTROL:          /* 8-bit access */
+
+		status = acpi_hw_low_level_write (8, value, &acpi_gbl_FADT->xpm2_cnt_blk);
+		break;
+
+
+	case ACPI_REGISTER_PM_TIMER:             /* 32-bit access */
+
+		status = acpi_hw_low_level_write (32, value, &acpi_gbl_FADT->xpm_tmr_blk);
+		break;
+
+
+	case ACPI_REGISTER_SMI_COMMAND_BLOCK:    /* 8-bit access */
+
+		/* SMI_CMD is currently always in IO space */
+
+		status = acpi_os_write_port (acpi_gbl_FADT->smi_cmd, value, 8);
+		break;
+
+
+	default:
+		status = AE_BAD_PARAMETER;
+		break;
+	}
+
+unlock_and_exit:
+	if (ACPI_MTX_LOCK == use_lock) {
+		(void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
+	}
+
+	return_ACPI_STATUS (status);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_low_level_read
+ *
+ * PARAMETERS:  Width               - 8, 16, or 32
+ *              Value               - Where the value is returned
+ *              Reg                 - GAS register structure
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Read from either memory or IO space.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_hw_low_level_read (
+	u32                             width,
+	u32                             *value,
+	struct acpi_generic_address     *reg)
+{
+	u64                             address;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_NAME ("hw_low_level_read");
+
+
+	/*
+	 * Must have a valid pointer to a GAS structure, and
+	 * a non-zero address within. However, don't return an error
+	 * because the PM1A/B code must not fail if B isn't present.
+	 */
+	if (!reg) {
+		return (AE_OK);
+	}
+
+	/* Get a local copy of the address.  Handles possible alignment issues */
+
+	ACPI_MOVE_64_TO_64 (&address, &reg->address);
+	if (!address) {
+		return (AE_OK);
+	}
+	*value = 0;
+
+	/*
+	 * Two address spaces supported: Memory or IO.
+	 * PCI_Config is not supported here because the GAS struct is insufficient
+	 */
+	switch (reg->address_space_id) {
+	case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+
+		status = acpi_os_read_memory (
+				 (acpi_physical_address) address,
+				 value, width);
+		break;
+
+
+	case ACPI_ADR_SPACE_SYSTEM_IO:
+
+		status = acpi_os_read_port ((acpi_io_address) address,
+				 value, width);
+		break;
+
+
+	default:
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+			"Unsupported address space: %X\n", reg->address_space_id));
+		return (AE_BAD_PARAMETER);
+	}
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Read:  %8.8X width %2d from %8.8X%8.8X (%s)\n",
+			*value, width,
+			ACPI_FORMAT_UINT64 (address),
+			acpi_ut_get_region_name (reg->address_space_id)));
+
+	return (status);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_low_level_write
+ *
+ * PARAMETERS:  Width               - 8, 16, or 32
+ *              Value               - To be written
+ *              Reg                 - GAS register structure
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Write to either memory or IO space.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_hw_low_level_write (
+	u32                             width,
+	u32                             value,
+	struct acpi_generic_address     *reg)
+{
+	u64                             address;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_NAME ("hw_low_level_write");
+
+
+	/*
+	 * Must have a valid pointer to a GAS structure, and
+	 * a non-zero address within. However, don't return an error
+	 * because the PM1A/B code must not fail if B isn't present.
+	 */
+	if (!reg) {
+		return (AE_OK);
+	}
+
+	/* Get a local copy of the address.  Handles possible alignment issues */
+
+	ACPI_MOVE_64_TO_64 (&address, &reg->address);
+	if (!address) {
+		return (AE_OK);
+	}
+
+	/*
+	 * Two address spaces supported: Memory or IO.
+	 * PCI_Config is not supported here because the GAS struct is insufficient
+	 */
+	switch (reg->address_space_id) {
+	case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+
+		status = acpi_os_write_memory (
+				 (acpi_physical_address) address,
+				 value, width);
+		break;
+
+
+	case ACPI_ADR_SPACE_SYSTEM_IO:
+
+		status = acpi_os_write_port ((acpi_io_address) address,
+				 value, width);
+		break;
+
+
+	default:
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+			"Unsupported address space: %X\n", reg->address_space_id));
+		return (AE_BAD_PARAMETER);
+	}
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Wrote: %8.8X width %2d   to %8.8X%8.8X (%s)\n",
+			value, width,
+			ACPI_FORMAT_UINT64 (address),
+			acpi_ut_get_region_name (reg->address_space_id)));
+
+	return (status);
+}