tbutils.c

xen虚拟机源代码安装包

	}

	/* Map just the table header */

	table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
	if (!table) {
		return;
	}

	/* If a particular signature is expected, signature must match */

	if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
		ACPI_ERROR((AE_INFO,
			    "Invalid signature 0x%X for ACPI table [%s]",
			    *ACPI_CAST_PTR(u32, table->signature), signature));
		goto unmap_and_exit;
	}

	/* Initialize the table entry */

	acpi_gbl_root_table_list.tables[table_index].address = address;
	acpi_gbl_root_table_list.tables[table_index].length = table->length;
	acpi_gbl_root_table_list.tables[table_index].flags = flags;

	ACPI_MOVE_32_TO_32(&
			   (acpi_gbl_root_table_list.tables[table_index].
			    signature), table->signature);

	acpi_tb_print_table_header(address, table);

	if (table_index == ACPI_TABLE_INDEX_DSDT) {

		/* Global integer width is based upon revision of the DSDT */

		acpi_ut_set_integer_width(table->revision);
	}

      unmap_and_exit:
	acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_root_table_entry
 *
 * PARAMETERS:  table_entry         - Pointer to the RSDT/XSDT table entry
 *              table_entry_size    - sizeof 32 or 64 (RSDT or XSDT)
 *
 * RETURN:      Physical address extracted from the root table
 *
 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
 *              both 32-bit and 64-bit platforms
 *
 * NOTE:        acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
 *              64-bit platforms.
 *
 ******************************************************************************/

static acpi_physical_address
acpi_tb_get_root_table_entry(u8 * table_entry,
			     acpi_native_uint table_entry_size)
{
	u64 address64;

	/*
	 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
	 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
	 */
	if (table_entry_size == sizeof(u32)) {
		/*
		 * 32-bit platform, RSDT: Return 32-bit table entry
		 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
		 */
		return ((acpi_physical_address)
			(*ACPI_CAST_PTR(u32, table_entry)));
	} else {
		/*
		 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
		 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, return 64-bit
		 */
		ACPI_MOVE_64_TO_64(&address64, table_entry);

#if ACPI_MACHINE_WIDTH == 32
		if (address64 > ACPI_UINT32_MAX) {

			/* Will truncate 64-bit address to 32 bits, issue warning */

			ACPI_WARNING((AE_INFO,
				      "64-bit Physical Address in XSDT is too large (%8.8X%8.8X), truncating",
				      ACPI_FORMAT_UINT64(address64)));
		}
#endif
		return ((acpi_physical_address) (address64));
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_parse_root_table
 *
 * PARAMETERS:  Rsdp                    - Pointer to the RSDP
 *              Flags                   - Flags
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to parse the Root System Description
 *              Table (RSDT or XSDT)
 *
 * NOTE:        Tables are mapped (not copied) for efficiency. The FACS must
 *              be mapped and cannot be copied because it contains the actual
 *              memory location of the ACPI Global Lock.
 *
 ******************************************************************************/

acpi_status __init
acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
{
	struct acpi_table_rsdp *rsdp;
	acpi_native_uint table_entry_size;
	acpi_native_uint i;
	u32 table_count;
	struct acpi_table_header *table;
	acpi_physical_address address;
	acpi_physical_address uninitialized_var(rsdt_address);
	u32 length;
	u8 *table_entry;
	acpi_status status;

	ACPI_FUNCTION_TRACE(tb_parse_root_table);

	/*
	 * Map the entire RSDP and extract the address of the RSDT or XSDT
	 */
	rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
	if (!rsdp) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	acpi_tb_print_table_header(rsdp_address,
				   ACPI_CAST_PTR(struct acpi_table_header,
						 rsdp));

	/* Differentiate between RSDT and XSDT root tables */

	if (rsdp->revision > 1 && rsdp->xsdt_physical_address) {
		/*
		 * Root table is an XSDT (64-bit physical addresses). We must use the
		 * XSDT if the revision is > 1 and the XSDT pointer is present, as per
		 * the ACPI specification.
		 */
		address = (acpi_physical_address) rsdp->xsdt_physical_address;
		table_entry_size = sizeof(u64);
		rsdt_address = (acpi_physical_address)
					rsdp->rsdt_physical_address;
	} else {
		/* Root table is an RSDT (32-bit physical addresses) */

		address = (acpi_physical_address) rsdp->rsdt_physical_address;
		table_entry_size = sizeof(u32);
	}

	/*
	 * It is not possible to map more than one entry in some environments,
	 * so unmap the RSDP here before mapping other tables
	 */
	acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));

	if (table_entry_size == sizeof(u64)) {
		if (acpi_tb_check_xsdt(address) == AE_NULL_ENTRY) {
			/* XSDT has NULL entry, RSDT is used */
			address = rsdt_address;
			table_entry_size = sizeof(u32);
			ACPI_WARNING((AE_INFO, "BIOS XSDT has NULL entry, "
					"using RSDT"));
		}
	}
	/* Map the RSDT/XSDT table header to get the full table length */

	table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
	if (!table) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	acpi_tb_print_table_header(address, table);

	/* Get the length of the full table, verify length and map entire table */

	length = table->length;
	acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));

	if (length < sizeof(struct acpi_table_header)) {
		ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT",
			    length));
		return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
	}

	table = acpi_os_map_memory(address, length);
	if (!table) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Validate the root table checksum */

	status = acpi_tb_verify_checksum(table, length);
	if (ACPI_FAILURE(status)) {
		acpi_os_unmap_memory(table, length);
		return_ACPI_STATUS(status);
	}

	/* Calculate the number of tables described in the root table */

	table_count =
	    (u32) ((table->length -
		    sizeof(struct acpi_table_header)) / table_entry_size);

	/*
	 * First two entries in the table array are reserved for the DSDT and FACS,
	 * which are not actually present in the RSDT/XSDT - they come from the FADT
	 */
	table_entry =
	    ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
	acpi_gbl_root_table_list.count = 2;

	/*
	 * Initialize the root table array from the RSDT/XSDT
	 */
	for (i = 0; i < table_count; i++) {
		if (acpi_gbl_root_table_list.count >=
		    acpi_gbl_root_table_list.size) {

			/* There is no more room in the root table array, attempt resize */

			status = acpi_tb_resize_root_table_list();
			if (ACPI_FAILURE(status)) {
				ACPI_WARNING((AE_INFO,
					      "Truncating %u table entries!",
					      (unsigned)
					      (acpi_gbl_root_table_list.size -
					       acpi_gbl_root_table_list.
					       count)));
				break;
			}
		}

		/* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */

		acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
		    address =
		    acpi_tb_get_root_table_entry(table_entry, table_entry_size);

		table_entry += table_entry_size;
		acpi_gbl_root_table_list.count++;
	}

	/*
	 * It is not possible to map more than one entry in some environments,
	 * so unmap the root table here before mapping other tables
	 */
	acpi_os_unmap_memory(table, length);

	/*
	 * Complete the initialization of the root table array by examining
	 * the header of each table
	 */
	for (i = 2; i < acpi_gbl_root_table_list.count; i++) {
		acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
				      address, flags, NULL, i);

		/* Special case for FADT - get the DSDT and FACS */

		if (ACPI_COMPARE_NAME
		    (&acpi_gbl_root_table_list.tables[i].signature,
		     ACPI_SIG_FADT)) {
			acpi_tb_parse_fadt(i, flags);
		}
	}

	return_ACPI_STATUS(AE_OK);
}