1 files changed, 606 insertions, 0 deletions

diff --git a/drivers/acpi/tables/tbxfroot.c b/drivers/acpi/tables/tbxfroot.c
new file mode 100644
index 000000000000..6e8072ebbac6
--- /dev/null
+++ b/drivers/acpi/tables/tbxfroot.c
@@ -0,0 +1,606 @@
+/******************************************************************************
+ *
+ * Module Name: tbxfroot - Find the root ACPI table (RSDT)
+ *
+ *****************************************************************************/
+
+/*
+ * 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/actables.h>
+
+
+#define _COMPONENT          ACPI_TABLES
+         ACPI_MODULE_NAME    ("tbxfroot")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_find_table
+ *
+ * PARAMETERS:  Signature           - String with ACPI table signature
+ *              oem_id              - String with the table OEM ID
+ *              oem_table_id        - String with the OEM Table ID.
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
+ *              Signature, OEM ID and OEM Table ID.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_find_table (
+        char                            *signature,
+        char                            *oem_id,
+        char                            *oem_table_id,
+        struct acpi_table_header        **table_ptr)
+{
+        acpi_status                     status;
+        struct acpi_table_header        *table;
+
+
+        ACPI_FUNCTION_TRACE ("tb_find_table");
+
+
+        /* Validate string lengths */
+
+        if ((ACPI_STRLEN (signature)  > ACPI_NAME_SIZE) ||
+                (ACPI_STRLEN (oem_id)     > sizeof (table->oem_id)) ||
+                (ACPI_STRLEN (oem_table_id) > sizeof (table->oem_table_id))) {
+                return_ACPI_STATUS (AE_AML_STRING_LIMIT);
+        }
+
+        if (!ACPI_STRNCMP (signature, DSDT_SIG, ACPI_NAME_SIZE)) {
+                /*
+                 * The DSDT pointer is contained in the FADT, not the RSDT.
+                 * This code should suffice, because the only code that would perform
+                 * a "find" on the DSDT is the data_table_region() AML opcode -- in
+                 * which case, the DSDT is guaranteed to be already loaded.
+                 * If this becomes insufficient, the FADT will have to be found first.
+                 */
+                if (!acpi_gbl_DSDT) {
+                        return_ACPI_STATUS (AE_NO_ACPI_TABLES);
+                }
+
+                table = acpi_gbl_DSDT;
+        }
+        else {
+                /* Find the table */
+
+                status = acpi_get_firmware_table (signature, 1,
+                                   ACPI_LOGICAL_ADDRESSING, &table);
+                if (ACPI_FAILURE (status)) {
+                        return_ACPI_STATUS (status);
+                }
+        }
+
+        /* Check oem_id and oem_table_id */
+
+        if ((oem_id[0]     && ACPI_STRNCMP (
+                         oem_id, table->oem_id, sizeof (table->oem_id))) ||
+                (oem_table_id[0] && ACPI_STRNCMP (
+                                   oem_table_id, table->oem_table_id, sizeof (table->oem_table_id)))) {
+                return_ACPI_STATUS (AE_AML_NAME_NOT_FOUND);
+        }
+
+        ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n", table->signature));
+        *table_ptr = table;
+        return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_firmware_table
+ *
+ * PARAMETERS:  Signature       - Any ACPI table signature
+ *              Instance        - the non zero instance of the table, allows
+ *                                support for multiple tables of the same type
+ *              Flags           - Physical/Virtual support
+ *              table_pointer   - Where a buffer containing the table is
+ *                                returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: This function is called to get an ACPI table. A buffer is
+ *              allocated for the table and returned in table_pointer.
+ *              This table will be a complete table including the header.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_get_firmware_table (
+        acpi_string                     signature,
+        u32                             instance,
+        u32                             flags,
+        struct acpi_table_header        **table_pointer)
+{
+        acpi_status                     status;
+        struct acpi_pointer             address;
+        struct acpi_table_header        *header = NULL;
+        struct acpi_table_desc          *table_info = NULL;
+        struct acpi_table_desc          *rsdt_info;
+        u32                             table_count;
+        u32                             i;
+        u32                             j;
+
+
+        ACPI_FUNCTION_TRACE ("acpi_get_firmware_table");
+
+
+        /*
+         * Ensure that at least the table manager is initialized.  We don't
+         * require that the entire ACPI subsystem is up for this interface.
+         * If we have a buffer, we must have a length too
+         */
+        if ((instance == 0)     ||
+                (!signature)        ||
+                (!table_pointer)) {
+                return_ACPI_STATUS (AE_BAD_PARAMETER);
+        }
+
+        /* Ensure that we have a RSDP */
+
+        if (!acpi_gbl_RSDP) {
+                /* Get the RSDP */
+
+                status = acpi_os_get_root_pointer (flags, &address);
+                if (ACPI_FAILURE (status)) {
+                        ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "RSDP not found\n"));
+                        return_ACPI_STATUS (AE_NO_ACPI_TABLES);
+                }
+
+                /* Map and validate the RSDP */
+
+                if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) {
+                        status = acpi_os_map_memory (address.pointer.physical, sizeof (struct rsdp_descriptor),
+                                          (void *) &acpi_gbl_RSDP);
+                        if (ACPI_FAILURE (status)) {
+                                return_ACPI_STATUS (status);
+                        }
+                }
+                else {
+                        acpi_gbl_RSDP = address.pointer.logical;
+                }
+
+                /* The signature and checksum must both be correct */
+
+                if (ACPI_STRNCMP ((char *) acpi_gbl_RSDP, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
+                        /* Nope, BAD Signature */
+
+                        return_ACPI_STATUS (AE_BAD_SIGNATURE);
+                }
+
+                if (acpi_tb_checksum (acpi_gbl_RSDP, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
+                        /* Nope, BAD Checksum */
+
+                        return_ACPI_STATUS (AE_BAD_CHECKSUM);
+                }
+        }
+
+        /* Get the RSDT address via the RSDP */
+
+        acpi_tb_get_rsdt_address (&address);
+        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+                "RSDP located at %p, RSDT physical=%8.8X%8.8X \n",
+                acpi_gbl_RSDP,
+                ACPI_FORMAT_UINT64 (address.pointer.value)));
+
+        /* Insert processor_mode flags */
+
+        address.pointer_type |= flags;
+
+        /* Get and validate the RSDT */
+
+        rsdt_info = ACPI_MEM_CALLOCATE (sizeof (struct acpi_table_desc));
+        if (!rsdt_info) {
+                return_ACPI_STATUS (AE_NO_MEMORY);
+        }
+
+        status = acpi_tb_get_table (&address, rsdt_info);
+        if (ACPI_FAILURE (status)) {
+                goto cleanup;
+        }
+
+        status = acpi_tb_validate_rsdt (rsdt_info->pointer);
+        if (ACPI_FAILURE (status)) {
+                goto cleanup;
+        }
+
+        /* Allocate a scratch table header and table descriptor */
+
+        header = ACPI_MEM_ALLOCATE (sizeof (struct acpi_table_header));
+        if (!header) {
+                status = AE_NO_MEMORY;
+                goto cleanup;
+        }
+
+        table_info = ACPI_MEM_ALLOCATE (sizeof (struct acpi_table_desc));
+        if (!table_info) {
+                status = AE_NO_MEMORY;
+                goto cleanup;
+        }
+
+        /* Get the number of table pointers within the RSDT */
+
+        table_count = acpi_tb_get_table_count (acpi_gbl_RSDP, rsdt_info->pointer);
+        address.pointer_type = acpi_gbl_table_flags | flags;
+
+        /*
+         * Search the RSDT/XSDT for the correct instance of the
+         * requested table
+         */
+        for (i = 0, j = 0; i < table_count; i++) {
+                /* Get the next table pointer, handle RSDT vs. XSDT */
+
+                if (acpi_gbl_RSDP->revision < 2) {
+                        address.pointer.value = (ACPI_CAST_PTR (
+                                RSDT_DESCRIPTOR, rsdt_info->pointer))->table_offset_entry[i];
+                }
+                else {
+                        address.pointer.value = (ACPI_CAST_PTR (
+                                XSDT_DESCRIPTOR, rsdt_info->pointer))->table_offset_entry[i];
+                }
+
+                /* Get the table header */
+
+                status = acpi_tb_get_table_header (&address, header);
+                if (ACPI_FAILURE (status)) {
+                        goto cleanup;
+                }
+
+                /* Compare table signatures and table instance */
+
+                if (!ACPI_STRNCMP (header->signature, signature, ACPI_NAME_SIZE)) {
+                        /* An instance of the table was found */
+
+                        j++;
+                        if (j >= instance) {
+                                /* Found the correct instance, get the entire table */
+
+                                status = acpi_tb_get_table_body (&address, header, table_info);
+                                if (ACPI_FAILURE (status)) {
+                                        goto cleanup;
+                                }
+
+                                *table_pointer = table_info->pointer;
+                                goto cleanup;
+                        }
+                }
+        }
+
+        /* Did not find the table */
+
+        status = AE_NOT_EXIST;
+
+
+cleanup:
+        acpi_os_unmap_memory (rsdt_info->pointer, (acpi_size) rsdt_info->pointer->length);
+        ACPI_MEM_FREE (rsdt_info);
+
+        if (header) {
+                ACPI_MEM_FREE (header);
+        }
+        if (table_info) {
+                ACPI_MEM_FREE (table_info);
+        }
+        return_ACPI_STATUS (status);
+}
+EXPORT_SYMBOL(acpi_get_firmware_table);
+
+
+/* TBD: Move to a new file */
+
+#if ACPI_MACHINE_WIDTH != 16
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_find_root_pointer
+ *
+ * PARAMETERS:  **rsdp_address          - Where to place the RSDP address
+ *              Flags                   - Logical/Physical addressing
+ *
+ * RETURN:      Status, Physical address of the RSDP
+ *
+ * DESCRIPTION: Find the RSDP
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_find_root_pointer (
+        u32                             flags,
+        struct acpi_pointer             *rsdp_address)
+{
+        struct acpi_table_desc          table_info;
+        acpi_status                     status;
+
+
+        ACPI_FUNCTION_TRACE ("acpi_find_root_pointer");
+
+
+        /* Get the RSDP */
+
+        status = acpi_tb_find_rsdp (&table_info, flags);
+        if (ACPI_FAILURE (status)) {
+                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                        "RSDP structure not found, %s Flags=%X\n",
+                        acpi_format_exception (status), flags));
+                return_ACPI_STATUS (AE_NO_ACPI_TABLES);
+        }
+
+        rsdp_address->pointer_type = ACPI_PHYSICAL_POINTER;
+        rsdp_address->pointer.physical = table_info.physical_address;
+        return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_scan_memory_for_rsdp
+ *
+ * PARAMETERS:  start_address       - Starting pointer for search
+ *              Length              - Maximum length to search
+ *
+ * RETURN:      Pointer to the RSDP if found, otherwise NULL.
+ *
+ * DESCRIPTION: Search a block of memory for the RSDP signature
+ *
+ ******************************************************************************/
+
+u8 *
+acpi_tb_scan_memory_for_rsdp (
+        u8                              *start_address,
+        u32                             length)
+{
+        u8                              *mem_rover;
+        u8                              *end_address;
+        u8                              checksum;
+
+
+        ACPI_FUNCTION_TRACE ("tb_scan_memory_for_rsdp");
+
+
+        end_address = start_address + length;
+
+        /* Search from given start address for the requested length */
+
+        for (mem_rover = start_address; mem_rover < end_address;
+                 mem_rover += ACPI_RSDP_SCAN_STEP) {
+                /* The signature and checksum must both be correct */
+
+                if (ACPI_STRNCMP ((char *) mem_rover, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
+                        /* No signature match, keep looking */
+
+                        continue;
+                }
+
+                /* Signature matches, check the appropriate checksum */
+
+                if ((ACPI_CAST_PTR (struct rsdp_descriptor, mem_rover))->revision < 2) {
+                        /* ACPI version 1.0 */
+
+                        checksum = acpi_tb_checksum (mem_rover, ACPI_RSDP_CHECKSUM_LENGTH);
+                }
+                else {
+                        /* Post ACPI 1.0, use extended_checksum */
+
+                        checksum = acpi_tb_checksum (mem_rover, ACPI_RSDP_XCHECKSUM_LENGTH);
+                }
+
+                if (checksum == 0) {
+                        /* Checksum valid, we have found a valid RSDP */
+
+                        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+                                "RSDP located at physical address %p\n", mem_rover));
+                        return_PTR (mem_rover);
+                }
+
+                ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+                        "Found an RSDP at physical address %p, but it has a bad checksum\n",
+                        mem_rover));
+        }
+
+        /* Searched entire block, no RSDP was found */
+
+        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+                "Searched entire block, no valid RSDP was found.\n"));
+        return_PTR (NULL);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_find_rsdp
+ *
+ * PARAMETERS:  *table_info             - Where the table info is returned
+ *              Flags                   - Current memory mode (logical vs.
+ *                                        physical addressing)
+ *
+ * RETURN:      Status, RSDP physical address
+ *
+ * DESCRIPTION: search lower 1_mbyte of memory for the root system descriptor
+ *              pointer structure.  If it is found, set *RSDP to point to it.
+ *
+ *              NOTE1: The RSDp must be either in the first 1_k of the Extended
+ *              BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.)
+ *              Only a 32-bit physical address is necessary.
+ *
+ *              NOTE2: This function is always available, regardless of the
+ *              initialization state of the rest of ACPI.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_find_rsdp (
+        struct acpi_table_desc          *table_info,
+        u32                             flags)
+{
+        u8                              *table_ptr;
+        u8                              *mem_rover;
+        u32                             physical_address;
+        acpi_status                     status;
+
+
+        ACPI_FUNCTION_TRACE ("tb_find_rsdp");
+
+
+        /*
+         * Scan supports either 1) Logical addressing or 2) Physical addressing
+         */
+        if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) {
+                /*
+                 * 1a) Get the location of the EBDA
+                 */
+                status = acpi_os_map_memory ((acpi_physical_address) ACPI_EBDA_PTR_LOCATION,
+                                  ACPI_EBDA_PTR_LENGTH,
+                                  (void *) &table_ptr);
+                if (ACPI_FAILURE (status)) {
+                        ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                                "Could not map memory at %8.8X for length %X\n",
+                                ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH));
+                        return_ACPI_STATUS (status);
+                }
+
+                ACPI_MOVE_16_TO_32 (&physical_address, table_ptr);
+                physical_address <<= 4;                 /* Convert segment to physical address */
+                acpi_os_unmap_memory (table_ptr, ACPI_EBDA_PTR_LENGTH);
+
+                /* EBDA present? */
+
+                if (physical_address > 0x400) {
+                        /*
+                         * 1b) Search EBDA paragraphs (EBDa is required to be a minimum of 1_k length)
+                         */
+                        status = acpi_os_map_memory ((acpi_physical_address) physical_address,
+                                          ACPI_EBDA_WINDOW_SIZE,
+                                          (void *) &table_ptr);
+                        if (ACPI_FAILURE (status)) {
+                                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                                        "Could not map memory at %8.8X for length %X\n",
+                                        physical_address, ACPI_EBDA_WINDOW_SIZE));
+                                return_ACPI_STATUS (status);
+                        }
+
+                        mem_rover = acpi_tb_scan_memory_for_rsdp (table_ptr, ACPI_EBDA_WINDOW_SIZE);
+                        acpi_os_unmap_memory (table_ptr, ACPI_EBDA_WINDOW_SIZE);
+
+                        if (mem_rover) {
+                                /* Found it, return the physical address */
+
+                                physical_address += ACPI_PTR_DIFF (mem_rover, table_ptr);
+
+                                table_info->physical_address = (acpi_physical_address) physical_address;
+                                return_ACPI_STATUS (AE_OK);
+                        }
+                }
+
+                /*
+                 * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
+                 */
+                status = acpi_os_map_memory ((acpi_physical_address) ACPI_HI_RSDP_WINDOW_BASE,
+                                  ACPI_HI_RSDP_WINDOW_SIZE,
+                                  (void *) &table_ptr);
+                if (ACPI_FAILURE (status)) {
+                        ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                                "Could not map memory at %8.8X for length %X\n",
+                                ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE));
+                        return_ACPI_STATUS (status);
+                }
+
+                mem_rover = acpi_tb_scan_memory_for_rsdp (table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
+                acpi_os_unmap_memory (table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
+
+                if (mem_rover) {
+                        /* Found it, return the physical address */
+
+                        physical_address = ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (mem_rover, table_ptr);
+
+                        table_info->physical_address = (acpi_physical_address) physical_address;
+                        return_ACPI_STATUS (AE_OK);
+                }
+        }
+
+        /*
+         * Physical addressing
+         */
+        else {
+                /*
+                 * 1a) Get the location of the EBDA
+                 */
+                ACPI_MOVE_16_TO_32 (&physical_address, ACPI_EBDA_PTR_LOCATION);
+                physical_address <<= 4;     /* Convert segment to physical address */
+
+                /* EBDA present? */
+
+                if (physical_address > 0x400) {
+                        /*
+                         * 1b) Search EBDA paragraphs (EBDa is required to be a minimum of 1_k length)
+                         */
+                        mem_rover = acpi_tb_scan_memory_for_rsdp (ACPI_PHYSADDR_TO_PTR (physical_address),
+                                          ACPI_EBDA_WINDOW_SIZE);
+                        if (mem_rover) {
+                                /* Found it, return the physical address */
+
+                                table_info->physical_address = ACPI_TO_INTEGER (mem_rover);
+                                return_ACPI_STATUS (AE_OK);
+                        }
+                }
+
+                /*
+                 * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
+                 */
+                mem_rover = acpi_tb_scan_memory_for_rsdp (ACPI_PHYSADDR_TO_PTR (ACPI_HI_RSDP_WINDOW_BASE),
+                                  ACPI_HI_RSDP_WINDOW_SIZE);
+                if (mem_rover) {
+                        /* Found it, return the physical address */
+
+                        table_info->physical_address = ACPI_TO_INTEGER (mem_rover);
+                        return_ACPI_STATUS (AE_OK);
+                }
+        }
+
+        /* RSDP signature was not found */
+
+        return_ACPI_STATUS (AE_NOT_FOUND);
+}
+
+#endif
+