tools/acpihelp/ahdecode.c

/******************************************************************************
 *
 * Module Name: ahdecode - Operator/Opcode decoding for acpihelp utility
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2011, 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 "acpihelp.h"

#define ACPI_CREATE_PREDEFINED_TABLE
#include "acpredef.h"

static char         Gbl_Buffer[64];
static const char   *AcpiRtypeNames[] =
{
    "/Integer",
    "/String",
    "/Buffer",
    "/Package",
    "/Reference",
};


/* Local prototypes */

static BOOLEAN
AhDisplayPredefinedName (
    char                    *Name,
    UINT32                  Length);

static void
AhDisplayPredefinedInfo (
    char                    *Name);

static void
AhGetExpectedTypes (
    char                    *Buffer,
    UINT32                  ExpectedBtypes);

static void
AhDisplayAmlOpcode (
    const AH_AML_OPCODE     *Op);

static void
AhDisplayAslOperator (
    const AH_ASL_OPERATOR   *Op);

static void
AhDisplayAslKeyword (
    const AH_ASL_KEYWORD    *Op);

static void
AhPrintOneField (
    UINT32                  Indent,
    UINT32                  CurrentPosition,
    UINT32                  MaxPosition,
    const char              *Field);


/*******************************************************************************
 *
 * FUNCTION:    AhFindPredefinedNames (entry point for predefined name search)
 *
 * PARAMETERS:  NamePrefix          - Name or prefix to find. Must start with
 *                                    an underscore. NULL means "find all"
 *
 * RETURN:      None
 *
 * DESCRIPTION: Find and display all ACPI predefined names that match the
 *              input name or prefix. Includes the required number of arguments
 *              and the expected return type, if any.
 *
 ******************************************************************************/

void
AhFindPredefinedNames (
    char                    *NamePrefix)
{
    UINT32                  Length;
    BOOLEAN                 Found;
    char                    Name[9];


    if (!NamePrefix)
    {
        Found = AhDisplayPredefinedName (Name, 0);
        return;
    }

    /* Contruct a local name or name prefix */

    AhStrupr (NamePrefix);
    if (*NamePrefix == '_')
    {
        NamePrefix++;
    }

    Name[0] = '_';
    strncpy (&Name[1], NamePrefix, 7);

    Length = strlen (Name);
    if (Length > 4)
    {
        printf ("%.8s: Predefined name must be 4 characters maximum\n", Name);
        return;
    }

    Found = AhDisplayPredefinedName (Name, Length);
    if (!Found)
    {
        printf ("%s, no matching predefined names\n", Name);
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AhDisplayPredefinedName
 *
 * PARAMETERS:  Name                - Name or name prefix
 *
 * RETURN:      TRUE if any names matched, FALSE otherwise
 *
 * DESCRIPTION: Display information about ACPI predefined names that match
 *              the input name or name prefix.
 *
 ******************************************************************************/

static BOOLEAN
AhDisplayPredefinedName (
    char                    *Name,
    UINT32                  Length)
{
    const AH_PREDEFINED_NAME    *Info;
    BOOLEAN                     Found = FALSE;
    BOOLEAN                     Matched;
    UINT32                      i;


    /* Find/display all names that match the input name prefix */

    for (Info = AslPredefinedInfo; Info->Name; Info++)
    {
        if (!Name)
        {
            Found = TRUE;
            printf ("%s: <%s>\n", Info->Name, Info->Description);
            printf ("%*s%s\n", 6, " ", Info->Action);

            AhDisplayPredefinedInfo (Info->Name);
            continue;
        }

        Matched = TRUE;
        for (i = 0; i < Length; i++)
        {
            if (Info->Name[i] != Name[i])
            {
                Matched = FALSE;
                break;
            }
        }

        if (Matched)
        {
            Found = TRUE;
            printf ("%s: <%s>\n", Info->Name, Info->Description);
            printf ("%*s%s\n", 6, " ", Info->Action);

            AhDisplayPredefinedInfo (Info->Name);
        }
    }

    return (Found);
}


/*******************************************************************************
 *
 * FUNCTION:    AhDisplayPredefinedInfo
 *
 * PARAMETERS:  Name                - Exact 4-character ACPI name.
 *
 * RETURN:      None
 *
 * DESCRIPTION: Find the name in the main ACPICA predefined info table and
 *              display the # of arguments and the return value type.
 *
 *              Note: Resource Descriptor field names do not appear in this
 *              table -- thus, nothing will be displayed for them.
 *
 ******************************************************************************/

static void
AhDisplayPredefinedInfo (
    char                    *Name)
{
    const ACPI_PREDEFINED_INFO  *ThisName;
    BOOLEAN                     Matched;
    UINT32                      i;


    /* Find/display only the exact input name */

    for (ThisName = PredefinedNames; ThisName->Info.Name[0]; ThisName++)
    {
        Matched = TRUE;
        for (i = 0; i < ACPI_NAME_SIZE; i++)
        {
            if (ThisName->Info.Name[i] != Name[i])
            {
                Matched = FALSE;
                break;
            }
        }

        if (Matched)
        {
            AhGetExpectedTypes (Gbl_Buffer, ThisName->Info.ExpectedBtypes);

            printf ("%*s%4.4s has %u arguments, returns: %s\n",
                6, " ", ThisName->Info.Name, ThisName->Info.ParamCount,
                ThisName->Info.ExpectedBtypes ? Gbl_Buffer : "-Nothing-");
            return;
        }

        if (ThisName->Info.ExpectedBtypes & ACPI_RTYPE_PACKAGE)
        {
            ThisName++;
        }
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AhGetExpectedTypes
 *
 * PARAMETERS:  Buffer              - Where the formatted string is returned
 *              ExpectedBTypes      - Bitfield of expected data types
 *
 * RETURN:      Formatted string in Buffer.
 *
 * DESCRIPTION: Format the expected object types into a printable string.
 *
 ******************************************************************************/

static void
AhGetExpectedTypes (
    char                    *Buffer,
    UINT32                  ExpectedBtypes)
{
    UINT32                  ThisRtype;
    UINT32                  i;
    UINT32                  j;


    j = 1;
    Buffer[0] = 0;
    ThisRtype = ACPI_RTYPE_INTEGER;

    for (i = 0; i < ACPI_NUM_RTYPES; i++)
    {
        /* If one of the expected types, concatenate the name of this type */

        if (ExpectedBtypes & ThisRtype)
        {
            strcat (Buffer, &AcpiRtypeNames[i][j]);
            j = 0;              /* Use name separator from now on */
        }
        ThisRtype <<= 1;    /* Next Rtype */
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AhFindAmlOpcode (entry point for AML opcode name search)
 *
 * PARAMETERS:  Name                - Name or prefix for an AML opcode.
 *                                    NULL means "find all"
 *
 * RETURN:      None
 *
 * DESCRIPTION: Find all AML opcodes that match the input Name or name
 *              prefix.
 *
 ******************************************************************************/

void
AhFindAmlOpcode (
    char                    *Name)
{
    const AH_AML_OPCODE     *Op;
    BOOLEAN                 Found = FALSE;


    AhStrupr (Name);

    /* Find/display all opcode names that match the input name prefix */

    for (Op = AmlOpcodeInfo; Op->OpcodeString; Op++)
    {
        if (!Op->OpcodeName) /* Unused opcodes */
        {
            continue;
        }

        if (!Name)
        {
            AhDisplayAmlOpcode (Op);
            Found = TRUE;
            continue;
        }

        /* Upper case the opcode name before substring compare */

        strcpy (Gbl_Buffer, Op->OpcodeName);
        AhStrupr (Gbl_Buffer);

        if (strstr (Gbl_Buffer, Name) == Gbl_Buffer)
        {
            AhDisplayAmlOpcode (Op);
            Found = TRUE;
        }
    }

    if (!Found)
    {
        printf ("%s, no matching AML operators\n", Name);
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AhDecodeAmlOpcode (entry point for AML opcode search)
 *
 * PARAMETERS:  OpcodeString        - String version of AML opcode
 *
 * RETURN:      None
 *
 * DESCRIPTION: Display information about the input AML opcode
 *
 ******************************************************************************/

void
AhDecodeAmlOpcode (
    char                    *OpcodeString)
{
    const AH_AML_OPCODE     *Op;
    UINT32                  Opcode;
    BOOLEAN                 Found = FALSE;
    UINT8                   Prefix;


    if (!OpcodeString)
    {
        AhFindAmlOpcode (NULL);
        return;
    }

    Opcode = ACPI_STRTOUL (OpcodeString, NULL, 16);
    if (Opcode > ACPI_UINT16_MAX)
    {
        printf ("Invalid opcode (more than 16 bits)\n");
        return;
    }

    /* Only valid opcode extension is 0x5B */

    Prefix = (Opcode & 0x0000FF00) >> 8;
    if (Prefix && (Prefix != 0x5B))
    {
        printf ("Invalid opcode (invalid extension prefix 0x%X)\n",
            Prefix);
        return;
    }

    /* Find/Display the opcode. May fall within an opcode range */

    for (Op = AmlOpcodeInfo; Op->OpcodeString; Op++)
    {
        if ((Opcode >= Op->OpcodeRangeStart) &&
            (Opcode <= Op->OpcodeRangeEnd))
        {
            AhDisplayAmlOpcode (Op);
            Found = TRUE;
        }
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AhDisplayAmlOpcode
 *
 * PARAMETERS:  Op                  - An opcode info struct
 *
 * RETURN:      None
 *
 * DESCRIPTION: Display the contents of an AML opcode information struct
 *
 ******************************************************************************/

static void
AhDisplayAmlOpcode (
    const AH_AML_OPCODE     *Op)
{

    if (!Op->OpcodeName)
    {
        printf ("%18s: Opcode=%-9s\n", "Reserved opcode", Op->OpcodeString);
        return;
    }

    /* Opcode name and value(s) */

    printf ("%18s: Opcode=%-9s Type (%s)",
        Op->OpcodeName, Op->OpcodeString, Op->Type);

    /* Optional fixed/static arguments */

    if (Op->FixedArguments)
    {
        printf (" FixedArgs (");
        AhPrintOneField (37, 36 + 7 + strlen (Op->Type) + 12,
            AH_MAX_AML_LINE_LENGTH, Op->FixedArguments);
        printf (")");
    }

    /* Optional variable-length argument list */

    if (Op->VariableArguments)
    {
        if (Op->FixedArguments)
        {
            printf ("\n%*s", 36, " ");
        }
        printf (" VariableArgs (");
        AhPrintOneField (37, 15, AH_MAX_AML_LINE_LENGTH, Op->VariableArguments);
        printf (")");
    }
    printf ("\n");

    /* Grammar specification */

    if (Op->Grammar)
    {
        AhPrintOneField (37, 0, AH_MAX_AML_LINE_LENGTH, Op->Grammar);
        printf ("\n");
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AhFindAslKeywords (entry point for ASL keyword search)
 *
 * PARAMETERS:  Name                - Name or prefix for an ASL keyword.
 *                                    NULL means "find all"
 *
 * RETURN:      None
 *
 * DESCRIPTION: Find all ASL keywords that match the input Name or name
 *              prefix.
 *
 ******************************************************************************/

void
AhFindAslKeywords (
    char                    *Name)
{
    const AH_ASL_KEYWORD    *Keyword;
    BOOLEAN                 Found = FALSE;


    AhStrupr (Name);

    for (Keyword = AslKeywordInfo; Keyword->Name; Keyword++)
    {
        if (!Name)
        {
            AhDisplayAslKeyword (Keyword);
            Found = TRUE;
            continue;
        }

        /* Upper case the operator name before substring compare */

        strcpy (Gbl_Buffer, Keyword->Name);
        AhStrupr (Gbl_Buffer);

        if (strstr (Gbl_Buffer, Name) == Gbl_Buffer)
        {
            AhDisplayAslKeyword (Keyword);
            Found = TRUE;
        }
    }

    if (!Found)
    {
        printf ("%s, no matching ASL keywords\n", Name);
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AhDisplayAslKeyword
 *
 * PARAMETERS:  Op                  - Pointer to ASL keyword with syntax info
 *
 * RETURN:      None
 *
 * DESCRIPTION: Format and display syntax info for an ASL keyword. Splits
 *              long lines appropriately for reading.
 *
 ******************************************************************************/

static void
AhDisplayAslKeyword (
    const AH_ASL_KEYWORD    *Op)
{

    /* ASL keyword name and description */

    printf ("%20s: %s\n", Op->Name, Op->Description);
    if (!Op->KeywordList)
    {
        return;
    }

    /* List of actual keywords */

    AhPrintOneField (22, 0, AH_MAX_ASL_LINE_LENGTH, Op->KeywordList);
    printf ("\n");
}


/*******************************************************************************
 *
 * FUNCTION:    AhFindAslOperators (entry point for ASL operator search)
 *
 * PARAMETERS:  Name                - Name or prefix for an ASL operator.
 *                                    NULL means "find all"
 *
 * RETURN:      None
 *
 * DESCRIPTION: Find all ASL operators that match the input Name or name
 *              prefix.
 *
 ******************************************************************************/

void
AhFindAslOperators (
    char                    *Name)
{
    const AH_ASL_OPERATOR   *Operator;
    BOOLEAN                 Found = FALSE;


    AhStrupr (Name);

    /* Find/display all names that match the input name prefix */

    for (Operator = AslOperatorInfo; Operator->Name; Operator++)
    {
        if (!Name)
        {
            AhDisplayAslOperator (Operator);
            Found = TRUE;
            continue;
        }

        /* Upper case the operator name before substring compare */

        strcpy (Gbl_Buffer, Operator->Name);
        AhStrupr (Gbl_Buffer);

        if (strstr (Gbl_Buffer, Name) == Gbl_Buffer)
        {
            AhDisplayAslOperator (Operator);
            Found = TRUE;
        }
    }

    if (!Found)
    {
        printf ("%s, no matching ASL operators\n", Name);
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AhDisplayAslOperator
 *
 * PARAMETERS:  Op                  - Pointer to ASL operator with syntax info
 *
 * RETURN:      None
 *
 * DESCRIPTION: Format and display syntax info for an ASL operator. Splits
 *              long lines appropriately for reading.
 *
 ******************************************************************************/

static void
AhDisplayAslOperator (
    const AH_ASL_OPERATOR   *Op)
{

    /* ASL operator name and description */

    printf ("%16s: %s\n", Op->Name, Op->Description);
    if (!Op->Syntax)
    {
        return;
    }

    /* Syntax for the operator */

    AhPrintOneField (18, 0, AH_MAX_ASL_LINE_LENGTH, Op->Syntax);
    printf ("\n");
}


/*******************************************************************************
 *
 * FUNCTION:    AhPrintOneField
 *
 * PARAMETERS:  Indent              - Indent length for new line(s)
 *              CurrentPosition     - Position on current line
 *              MaxPosition         - Max allowed line length
 *              Field               - Data to output
 *
 * RETURN:      Line position after field is written
 *
 * DESCRIPTION: Split long lines appropriately for ease of reading.
 *
 ******************************************************************************/

static void
AhPrintOneField (
    UINT32                  Indent,
    UINT32                  CurrentPosition,
    UINT32                  MaxPosition,
    const char              *Field)
{
    UINT32                  Position;
    UINT32                  TokenLength;
    const char              *This;
    const char              *Next;
    const char              *Last;


    This = Field;
    Position = CurrentPosition;

    if (Position == 0)
    {
        printf ("%*s", (int) Indent, " ");
        Position = Indent;
    }

    Last = This + strlen (This);
    while ((Next = strpbrk (This, " ")))
    {
        TokenLength = Next - This;
        Position += TokenLength;

        /* Split long lines */

        if (Position > MaxPosition)
        {
            printf ("\n%*s", (int) Indent, " ");
            Position = TokenLength;
        }

        printf ("%.*s ", (int) TokenLength, This);
        This = Next + 1;
    }

    /* Handle last token on the input line */

    TokenLength = Last - This;
    if (TokenLength > 0)
    {
        Position += TokenLength;
        if (Position > MaxPosition)
        {
            printf ("\n%*s", (int) Indent, " ");
        }
        printf ("%s", This);
    }
}