1 files changed, 299 insertions, 0 deletions
diff --git a/sys/contrib/dev/acpica/components/tables/tbxfroot.c b/sys/contrib/dev/acpica/components/tables/tbxfroot.c
new file mode 100644
index 0000000..c6ade4e
--- /dev/null
+++ b/sys/contrib/dev/acpica/components/tables/tbxfroot.c
@@ -0,0 +1,299 @@
+/******************************************************************************
+ *
+ * Module Name: tbxfroot - Find the root ACPI table (RSDT)
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2012, 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.
+ */
+
+#define __TBXFROOT_C__
+
+#include <contrib/dev/acpica/include/acpi.h>
+#include <contrib/dev/acpica/include/accommon.h>
+#include <contrib/dev/acpica/include/actables.h>
+
+
+#define _COMPONENT          ACPI_TABLES
+        ACPI_MODULE_NAME    ("tbxfroot")
+
+/* Local prototypes */
+
+static UINT8 *
+AcpiTbScanMemoryForRsdp (
+    UINT8                   *StartAddress,
+    UINT32                  Length);
+
+static ACPI_STATUS
+AcpiTbValidateRsdp (
+    ACPI_TABLE_RSDP         *Rsdp);
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiTbValidateRsdp
+ *
+ * PARAMETERS:  Rsdp                - Pointer to unvalidated RSDP
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Validate the RSDP (ptr)
+ *
+ ******************************************************************************/
+
+static ACPI_STATUS
+AcpiTbValidateRsdp (
+    ACPI_TABLE_RSDP         *Rsdp)
+{
+    ACPI_FUNCTION_ENTRY ();
+
+
+    /*
+     * The signature and checksum must both be correct
+     *
+     * Note: Sometimes there exists more than one RSDP in memory; the valid
+     * RSDP has a valid checksum, all others have an invalid checksum.
+     */
+    if (ACPI_STRNCMP ((char *) Rsdp, ACPI_SIG_RSDP,
+            sizeof (ACPI_SIG_RSDP)-1) != 0)
+    {
+        /* Nope, BAD Signature */
+
+        return (AE_BAD_SIGNATURE);
+    }
+
+    /* Check the standard checksum */
+
+    if (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0)
+    {
+        return (AE_BAD_CHECKSUM);
+    }
+
+    /* Check extended checksum if table version >= 2 */
+
+    if ((Rsdp->Revision >= 2) &&
+        (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0))
+    {
+        return (AE_BAD_CHECKSUM);
+    }
+
+    return (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiFindRootPointer
+ *
+ * PARAMETERS:  TableAddress            - Where the table pointer is returned
+ *
+ * RETURN:      Status, RSDP physical address
+ *
+ * DESCRIPTION: Search lower 1Mbyte 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 1K 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
+AcpiFindRootPointer (
+    ACPI_SIZE               *TableAddress)
+{
+    UINT8                   *TablePtr;
+    UINT8                   *MemRover;
+    UINT32                  PhysicalAddress;
+
+
+    ACPI_FUNCTION_TRACE (AcpiFindRootPointer);
+
+
+    /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */
+
+    TablePtr = AcpiOsMapMemory (
+                (ACPI_PHYSICAL_ADDRESS) ACPI_EBDA_PTR_LOCATION,
+                ACPI_EBDA_PTR_LENGTH);
+    if (!TablePtr)
+    {
+        ACPI_ERROR ((AE_INFO,
+            "Could not map memory at 0x%8.8X for length %u",
+            ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH));
+
+        return_ACPI_STATUS (AE_NO_MEMORY);
+    }
+
+    ACPI_MOVE_16_TO_32 (&PhysicalAddress, TablePtr);
+
+    /* Convert segment part to physical address */
+
+    PhysicalAddress <<= 4;
+    AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_PTR_LENGTH);
+
+    /* EBDA present? */
+
+    if (PhysicalAddress > 0x400)
+    {
+        /*
+         * 1b) Search EBDA paragraphs (EBDA is required to be a
+         *     minimum of 1K length)
+         */
+        TablePtr = AcpiOsMapMemory (
+                    (ACPI_PHYSICAL_ADDRESS) PhysicalAddress,
+                    ACPI_EBDA_WINDOW_SIZE);
+        if (!TablePtr)
+        {
+            ACPI_ERROR ((AE_INFO,
+                "Could not map memory at 0x%8.8X for length %u",
+                PhysicalAddress, ACPI_EBDA_WINDOW_SIZE));
+
+            return_ACPI_STATUS (AE_NO_MEMORY);
+        }
+
+        MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_EBDA_WINDOW_SIZE);
+        AcpiOsUnmapMemory (TablePtr, ACPI_EBDA_WINDOW_SIZE);
+
+        if (MemRover)
+        {
+            /* Return the physical address */
+
+            PhysicalAddress += (UINT32) ACPI_PTR_DIFF (MemRover, TablePtr);
+
+            *TableAddress = PhysicalAddress;
+            return_ACPI_STATUS (AE_OK);
+        }
+    }
+
+    /*
+     * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
+     */
+    TablePtr = AcpiOsMapMemory (
+                (ACPI_PHYSICAL_ADDRESS) ACPI_HI_RSDP_WINDOW_BASE,
+                ACPI_HI_RSDP_WINDOW_SIZE);
+
+    if (!TablePtr)
+    {
+        ACPI_ERROR ((AE_INFO,
+            "Could not map memory at 0x%8.8X for length %u",
+            ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE));
+
+        return_ACPI_STATUS (AE_NO_MEMORY);
+    }
+
+    MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE);
+    AcpiOsUnmapMemory (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE);
+
+    if (MemRover)
+    {
+        /* Return the physical address */
+
+        PhysicalAddress = (UINT32)
+            (ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (MemRover, TablePtr));
+
+        *TableAddress = PhysicalAddress;
+        return_ACPI_STATUS (AE_OK);
+    }
+
+    /* A valid RSDP was not found */
+
+    ACPI_ERROR ((AE_INFO, "A valid RSDP was not found"));
+    return_ACPI_STATUS (AE_NOT_FOUND);
+}
+
+ACPI_EXPORT_SYMBOL (AcpiFindRootPointer)
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiTbScanMemoryForRsdp
+ *
+ * PARAMETERS:  StartAddress        - 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
+ *
+ ******************************************************************************/
+
+static UINT8 *
+AcpiTbScanMemoryForRsdp (
+    UINT8                   *StartAddress,
+    UINT32                  Length)
+{
+    ACPI_STATUS             Status;
+    UINT8                   *MemRover;
+    UINT8                   *EndAddress;
+
+
+    ACPI_FUNCTION_TRACE (TbScanMemoryForRsdp);
+
+
+    EndAddress = StartAddress + Length;
+
+    /* Search from given start address for the requested length */
+
+    for (MemRover = StartAddress; MemRover < EndAddress;
+         MemRover += ACPI_RSDP_SCAN_STEP)
+    {
+        /* The RSDP signature and checksum must both be correct */
+
+        Status = AcpiTbValidateRsdp (ACPI_CAST_PTR (ACPI_TABLE_RSDP, MemRover));
+        if (ACPI_SUCCESS (Status))
+        {
+            /* Sig and checksum valid, we have found a real RSDP */
+
+            ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+                "RSDP located at physical address %p\n", MemRover));
+            return_PTR (MemRover);
+        }
+
+        /* No sig match or bad checksum, keep searching */
+    }
+
+    /* Searched entire block, no RSDP was found */
+
+    ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+        "Searched entire block from %p, valid RSDP was not found\n",
+        StartAddress));
+    return_PTR (NULL);
+}
+