1 files changed, 582 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
new file mode 100644
index 000000000000..4eb7189974ca
--- /dev/null
+++ b/drivers/acpi/acpica/tbutils.c
@@ -0,0 +1,582 @@
+/******************************************************************************
+ *
+ * Module Name: tbutils   - table utilities
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, Intel Corp.
+ * 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/accommon.h>
+#include <acpi/actables.h>
+
+#define _COMPONENT          ACPI_TABLES
+ACPI_MODULE_NAME("tbutils")
+
+/* Local prototypes */
+static acpi_physical_address
+acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_check_xsdt
+ *
+ * PARAMETERS:  address                    - Pointer to the XSDT
+ *
+ * RETURN:      status
+ *              AE_OK - XSDT is okay
+ *              AE_NO_MEMORY - can't map XSDT
+ *              AE_INVALID_TABLE_LENGTH - invalid table length
+ *              AE_NULL_ENTRY - XSDT has NULL entry
+ *
+ * DESCRIPTION: validate XSDT
+******************************************************************************/
+
+static acpi_status
+acpi_tb_check_xsdt(acpi_physical_address address)
+{
+        struct acpi_table_header *table;
+        u32 length;
+        u64 xsdt_entry_address;
+        u8 *table_entry;
+        u32 table_count;
+        int i;
+
+        table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
+        if (!table)
+                return AE_NO_MEMORY;
+
+        length = table->length;
+        acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+        if (length < sizeof(struct acpi_table_header))
+                return AE_INVALID_TABLE_LENGTH;
+
+        table = acpi_os_map_memory(address, length);
+        if (!table)
+                return AE_NO_MEMORY;
+
+        /* Calculate the number of tables described in XSDT */
+        table_count =
+                (u32) ((table->length -
+                sizeof(struct acpi_table_header)) / sizeof(u64));
+        table_entry =
+                ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
+        for (i = 0; i < table_count; i++) {
+                ACPI_MOVE_64_TO_64(&xsdt_entry_address, table_entry);
+                if (!xsdt_entry_address) {
+                        /* XSDT has NULL entry */
+                        break;
+                }
+                table_entry += sizeof(u64);
+        }
+        acpi_os_unmap_memory(table, length);
+
+        if (i < table_count)
+                return AE_NULL_ENTRY;
+        else
+                return AE_OK;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_initialize_facs
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
+ *              for accessing the Global Lock and Firmware Waking Vector
+ *
+ ******************************************************************************/
+
+acpi_status acpi_tb_initialize_facs(void)
+{
+        acpi_status status;
+
+        status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
+                                         ACPI_CAST_INDIRECT_PTR(struct
+                                                                acpi_table_header,
+                                                                &acpi_gbl_FACS));
+        return status;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_tables_loaded
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      TRUE if required ACPI tables are loaded
+ *
+ * DESCRIPTION: Determine if the minimum required ACPI tables are present
+ *              (FADT, FACS, DSDT)
+ *
+ ******************************************************************************/
+
+u8 acpi_tb_tables_loaded(void)
+{
+
+        if (acpi_gbl_root_table_list.count >= 3) {
+                return (TRUE);
+        }
+
+        return (FALSE);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_print_table_header
+ *
+ * PARAMETERS:  Address             - Table physical address
+ *              Header              - Table header
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
+ *
+ ******************************************************************************/
+
+void
+acpi_tb_print_table_header(acpi_physical_address address,
+                           struct acpi_table_header *header)
+{
+
+        if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
+
+                /* FACS only has signature and length fields of common table header */
+
+                ACPI_INFO((AE_INFO, "%4.4s %08lX, %04X",
+                           header->signature, (unsigned long)address,
+                           header->length));
+        } else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) {
+
+                /* RSDP has no common fields */
+
+                ACPI_INFO((AE_INFO, "RSDP %08lX, %04X (r%d %6.6s)",
+                           (unsigned long)address,
+                           (ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
+                            revision >
+                            0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
+                                               header)->length : 20,
+                           ACPI_CAST_PTR(struct acpi_table_rsdp,
+                                         header)->revision,
+                           ACPI_CAST_PTR(struct acpi_table_rsdp,
+                                         header)->oem_id));
+        } else {
+                /* Standard ACPI table with full common header */
+
+                ACPI_INFO((AE_INFO,
+                           "%4.4s %08lX, %04X (r%d %6.6s %8.8s %8X %4.4s %8X)",
+                           header->signature, (unsigned long)address,
+                           header->length, header->revision, header->oem_id,
+                           header->oem_table_id, header->oem_revision,
+                           header->asl_compiler_id,
+                           header->asl_compiler_revision));
+        }
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_validate_checksum
+ *
+ * PARAMETERS:  Table               - ACPI table to verify
+ *              Length              - Length of entire table
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
+ *              exception on bad checksum.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
+{
+        u8 checksum;
+
+        /* Compute the checksum on the table */
+
+        checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
+
+        /* Checksum ok? (should be zero) */
+
+        if (checksum) {
+                ACPI_WARNING((AE_INFO,
+                              "Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X",
+                              table->signature, table->checksum,
+                              (u8) (table->checksum - checksum)));
+
+#if (ACPI_CHECKSUM_ABORT)
+
+                return (AE_BAD_CHECKSUM);
+#endif
+        }
+
+        return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_checksum
+ *
+ * PARAMETERS:  Buffer          - Pointer to memory region to be checked
+ *              Length          - Length of this memory region
+ *
+ * RETURN:      Checksum (u8)
+ *
+ * DESCRIPTION: Calculates circular checksum of memory region.
+ *
+ ******************************************************************************/
+
+u8 acpi_tb_checksum(u8 *buffer, u32 length)
+{
+        u8 sum = 0;
+        u8 *end = buffer + length;
+
+        while (buffer < end) {
+                sum = (u8) (sum + *(buffer++));
+        }
+
+        return sum;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_install_table
+ *
+ * PARAMETERS:  Address                 - Physical address of DSDT or FACS
+ *              Flags                   - Flags
+ *              Signature               - Table signature, NULL if no need to
+ *                                        match
+ *              table_index             - Index into root table array
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Install an ACPI table into the global data structure.
+ *
+ ******************************************************************************/
+
+void
+acpi_tb_install_table(acpi_physical_address address,
+                      u8 flags, char *signature, u32 table_index)
+{
+        struct acpi_table_header *table;
+
+        if (!address) {
+                ACPI_ERROR((AE_INFO,
+                            "Null physical address for ACPI table [%s]",
+                            signature));
+                return;
+        }
+
+        /* 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, u32 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;
+        u32 table_entry_size;
+        u32 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);
+}