patch-2.4.22 linux-2.4.22/drivers/acpi/tables/tbrsdt.c

• Lines: 316
• Date: 2003-08-25 04:44:41.000000000 -0700
• Orig file: linux-2.4.21/drivers/acpi/tables/tbrsdt.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/drivers/acpi/tables/tbrsdt.c linux-2.4.22/drivers/acpi/tables/tbrsdt.c
@@ -0,0 +1,315 @@
+/******************************************************************************
+ *
+ * Module Name: tbrsdt - ACPI RSDT table utilities
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2003, 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 <acpi/acpi.h>
+#include <acpi/actables.h>
+
+
+#define _COMPONENT          ACPI_TABLES
+	 ACPI_MODULE_NAME    ("tbrsdt")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_verify_rsdp
+ *
+ * PARAMETERS:  Address         - RSDP (Pointer to RSDT)
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_verify_rsdp (
+	struct acpi_pointer             *address)
+{
+	struct acpi_table_desc          table_info;
+	acpi_status                     status;
+	struct rsdp_descriptor          *rsdp;
+
+
+	ACPI_FUNCTION_TRACE ("tb_verify_rsdp");
+
+
+	switch (address->pointer_type) {
+	case ACPI_LOGICAL_POINTER:
+
+		rsdp = address->pointer.logical;
+		break;
+
+	case ACPI_PHYSICAL_POINTER:
+		/*
+		 * Obtain access to the RSDP structure
+		 */
+		status = acpi_os_map_memory (address->pointer.physical, sizeof (struct rsdp_descriptor),
+				  (void *) &rsdp);
+		if (ACPI_FAILURE (status)) {
+			return_ACPI_STATUS (status);
+		}
+		break;
+
+	default:
+		return_ACPI_STATUS (AE_BAD_PARAMETER);
+	}
+
+	/*
+	 *  The signature and checksum must both be correct
+	 */
+	if (ACPI_STRNCMP ((char *) rsdp, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
+		/* Nope, BAD Signature */
+
+		status = AE_BAD_SIGNATURE;
+		goto cleanup;
+	}
+
+	/* Check the standard checksum */
+
+	if (acpi_tb_checksum (rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
+		status = AE_BAD_CHECKSUM;
+		goto cleanup;
+	}
+
+	/* Check extended checksum if table version >= 2 */
+
+	if (rsdp->revision >= 2) {
+		if (acpi_tb_checksum (rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0) {
+			status = AE_BAD_CHECKSUM;
+			goto cleanup;
+		}
+	}
+
+	/* The RSDP supplied is OK */
+
+	table_info.pointer     = ACPI_CAST_PTR (struct acpi_table_header, rsdp);
+	table_info.length      = sizeof (struct rsdp_descriptor);
+	table_info.allocation  = ACPI_MEM_MAPPED;
+
+	/* Save the table pointers and allocation info */
+
+	status = acpi_tb_init_table_descriptor (ACPI_TABLE_RSDP, &table_info);
+	if (ACPI_FAILURE (status)) {
+		goto cleanup;
+	}
+
+	/* Save the RSDP in a global for easy access */
+
+	acpi_gbl_RSDP = ACPI_CAST_PTR (struct rsdp_descriptor, table_info.pointer);
+	return_ACPI_STATUS (status);
+
+
+	/* Error exit */
+cleanup:
+
+	if (acpi_gbl_table_flags & ACPI_PHYSICAL_POINTER) {
+		acpi_os_unmap_memory (rsdp, sizeof (struct rsdp_descriptor));
+	}
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_get_rsdt_address
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      RSDT physical address
+ *
+ * DESCRIPTION: Extract the address of the RSDT or XSDT, depending on the
+ *              version of the RSDP
+ *
+ ******************************************************************************/
+
+void
+acpi_tb_get_rsdt_address (
+	struct acpi_pointer             *out_address)
+{
+
+	ACPI_FUNCTION_ENTRY ();
+
+
+	out_address->pointer_type = acpi_gbl_table_flags | ACPI_LOGICAL_ADDRESSING;
+
+	/*
+	 * For RSDP revision 0 or 1, we use the RSDT.
+	 * For RSDP revision 2 (and above), we use the XSDT
+	 */
+	if (acpi_gbl_RSDP->revision < 2) {
+		out_address->pointer.value = acpi_gbl_RSDP->rsdt_physical_address;
+	}
+	else {
+		out_address->pointer.value = acpi_gbl_RSDP->xsdt_physical_address;
+	}
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_validate_rsdt
+ *
+ * PARAMETERS:  table_ptr       - Addressable pointer to the RSDT.
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Validate signature for the RSDT or XSDT
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_validate_rsdt (
+	struct acpi_table_header        *table_ptr)
+{
+	int                             no_match;
+
+
+	ACPI_FUNCTION_NAME ("tb_validate_rsdt");
+
+
+	/*
+	 * For RSDP revision 0 or 1, we use the RSDT.
+	 * For RSDP revision 2 and above, we use the XSDT
+	 */
+	if (acpi_gbl_RSDP->revision < 2) {
+		no_match = ACPI_STRNCMP ((char *) table_ptr, RSDT_SIG,
+				  sizeof (RSDT_SIG) -1);
+	}
+	else {
+		no_match = ACPI_STRNCMP ((char *) table_ptr, XSDT_SIG,
+				  sizeof (XSDT_SIG) -1);
+	}
+
+	if (no_match) {
+		/* Invalid RSDT or XSDT signature */
+
+		ACPI_REPORT_ERROR (("Invalid signature where RSDP indicates RSDT/XSDT should be located\n"));
+
+		ACPI_DUMP_BUFFER (acpi_gbl_RSDP, 20);
+
+		ACPI_DEBUG_PRINT_RAW ((ACPI_DB_ERROR,
+			"RSDT/XSDT signature at %X (%p) is invalid\n",
+			acpi_gbl_RSDP->rsdt_physical_address,
+			(void *) (acpi_native_uint) acpi_gbl_RSDP->rsdt_physical_address));
+
+		return (AE_BAD_SIGNATURE);
+	}
+
+	return (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_get_table_rsdt
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_get_table_rsdt (
+	void)
+{
+	struct acpi_table_desc          table_info;
+	acpi_status                     status;
+	struct acpi_pointer             address;
+
+
+	ACPI_FUNCTION_TRACE ("tb_get_table_rsdt");
+
+
+	/* Get the RSDT/XSDT via the RSDP */
+
+	acpi_tb_get_rsdt_address (&address);
+
+	status = acpi_tb_get_table (&address, &table_info);
+	if (ACPI_FAILURE (status)) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not get the RSDT/XSDT, %s\n",
+			acpi_format_exception (status)));
+		return_ACPI_STATUS (status);
+	}
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+		"RSDP located at %p, points to RSDT physical=%8.8X%8.8X \n",
+		acpi_gbl_RSDP,
+		ACPI_HIDWORD (address.pointer.value),
+		ACPI_LODWORD (address.pointer.value)));
+
+	/* Check the RSDT or XSDT signature */
+
+	status = acpi_tb_validate_rsdt (table_info.pointer);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	/* Get the number of tables defined in the RSDT or XSDT */
+
+	acpi_gbl_rsdt_table_count = acpi_tb_get_table_count (acpi_gbl_RSDP, table_info.pointer);
+
+	/* Convert and/or copy to an XSDT structure */
+
+	status = acpi_tb_convert_to_xsdt (&table_info);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	/* Save the table pointers and allocation info */
+
+	status = acpi_tb_init_table_descriptor (ACPI_TABLE_XSDT, &table_info);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	acpi_gbl_XSDT = (XSDT_DESCRIPTOR *) table_info.pointer;
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "XSDT located at %p\n", acpi_gbl_XSDT));
+	return_ACPI_STATUS (status);
+}
+
+