1 files changed, 183 insertions, 175 deletions

diff --git a/drivers/acpi/parser/psargs.c b/drivers/acpi/parser/psargs.c
index 5858188f94a6..de573be52718 100644
--- a/drivers/acpi/parser/psargs.c
+++ b/drivers/acpi/parser/psargs.c
@@ -5,7 +5,7 @@
  *****************************************************************************/
 
 /*
- * Copyright (C) 2000 - 2005, R. Byron Moore
+ * Copyright (C) 2000 - 2006, R. Byron Moore
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -45,6 +45,7 @@
 #include <acpi/acparser.h>
 #include <acpi/amlcode.h>
 #include <acpi/acnamesp.h>
+#include <acpi/acdispat.h>
 
 #define _COMPONENT          ACPI_PARSER
 ACPI_MODULE_NAME("psargs")
@@ -62,61 +63,51 @@ static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
  *
  * PARAMETERS:  parser_state        - Current parser state object
  *
- * RETURN:      Decoded package length.  On completion, the AML pointer points
+ * RETURN:      Decoded package length. On completion, the AML pointer points
  *              past the length byte or bytes.
  *
- * DESCRIPTION: Decode and return a package length field
+ * DESCRIPTION: Decode and return a package length field.
+ *              Note: Largest package length is 28 bits, from ACPI specification
  *
  ******************************************************************************/
 
 static u32
 acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state)
 {
-        u32 encoded_length;
-        u32 length = 0;
+        u8 *aml = parser_state->aml;
+        u32 package_length = 0;
+        acpi_native_uint byte_count;
+        u8 byte_zero_mask = 0x3F;       /* Default [0:5] */
 
         ACPI_FUNCTION_TRACE("ps_get_next_package_length");
 
-        encoded_length = (u32) ACPI_GET8(parser_state->aml);
-        parser_state->aml++;
-
-        switch (encoded_length >> 6) {  /* bits 6-7 contain encoding scheme */
-        case 0:         /* 1-byte encoding (bits 0-5) */
-
-                length = (encoded_length & 0x3F);
-                break;
-
-        case 1:         /* 2-byte encoding (next byte + bits 0-3) */
-
-                length = ((ACPI_GET8(parser_state->aml) << 04) |
-                          (encoded_length & 0x0F));
-                parser_state->aml++;
-                break;
-
-        case 2:         /* 3-byte encoding (next 2 bytes + bits 0-3) */
-
-                length = ((ACPI_GET8(parser_state->aml + 1) << 12) |
-                          (ACPI_GET8(parser_state->aml) << 04) |
-                          (encoded_length & 0x0F));
-                parser_state->aml += 2;
-                break;
+        /*
+         * Byte 0 bits [6:7] contain the number of additional bytes
+         * used to encode the package length, either 0,1,2, or 3
+         */
+        byte_count = (aml[0] >> 6);
+        parser_state->aml += (byte_count + 1);
 
-        case 3:         /* 4-byte encoding (next 3 bytes + bits 0-3) */
+        /* Get bytes 3, 2, 1 as needed */
 
-                length = ((ACPI_GET8(parser_state->aml + 2) << 20) |
-                          (ACPI_GET8(parser_state->aml + 1) << 12) |
-                          (ACPI_GET8(parser_state->aml) << 04) |
-                          (encoded_length & 0x0F));
-                parser_state->aml += 3;
-                break;
-
-        default:
+        while (byte_count) {
+                /*
+                 * Final bit positions for the package length bytes:
+                 *      Byte3->[20:27]
+                 *      Byte2->[12:19]
+                 *      Byte1->[04:11]
+                 *      Byte0->[00:03]
+                 */
+                package_length |= (aml[byte_count] << ((byte_count << 3) - 4));
 
-                /* Can't get here, only 2 bits / 4 cases */
-                break;
+                byte_zero_mask = 0x0F;  /* Use bits [0:3] of byte 0 */
+                byte_count--;
         }
 
-        return_VALUE(length);
+        /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
+
+        package_length |= (aml[0] & byte_zero_mask);
+        return_UINT32(package_length);
 }
 
 /*******************************************************************************
@@ -135,16 +126,15 @@ acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state)
 u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state)
 {
         u8 *start = parser_state->aml;
-        acpi_native_uint length;
+        u32 package_length;
 
         ACPI_FUNCTION_TRACE("ps_get_next_package_end");
 
-        /* Function below changes parser_state->Aml */
+        /* Function below updates parser_state->Aml */
 
-        length =
-            (acpi_native_uint) acpi_ps_get_next_package_length(parser_state);
+        package_length = acpi_ps_get_next_package_length(parser_state);
 
-        return_PTR(start + length);     /* end of package */
+        return_PTR(start + package_length);     /* end of package */
 }
 
 /*******************************************************************************
@@ -169,17 +159,15 @@ char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
 
         ACPI_FUNCTION_TRACE("ps_get_next_namestring");
 
-        /* Handle multiple prefix characters */
-
-        while (acpi_ps_is_prefix_char(ACPI_GET8(end))) {
-                /* Include prefix '\\' or '^' */
+        /* Point past any namestring prefix characters (backslash or carat) */
 
+        while (acpi_ps_is_prefix_char(*end)) {
                 end++;
         }
 
-        /* Decode the path */
+        /* Decode the path prefix character */
 
-        switch (ACPI_GET8(end)) {
+        switch (*end) {
         case 0:
 
                 /* null_name */
@@ -199,9 +187,9 @@ char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
 
         case AML_MULTI_NAME_PREFIX_OP:
 
-                /* Multiple name segments, 4 chars each */
+                /* Multiple name segments, 4 chars each, count in next byte */
 
-                end += 2 + ((acpi_size) ACPI_GET8(end + 1) * ACPI_NAME_SIZE);
+                end += 2 + (*(end + 1) * ACPI_NAME_SIZE);
                 break;
 
         default:
@@ -212,7 +200,7 @@ char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
                 break;
         }
 
-        parser_state->aml = (u8 *) end;
+        parser_state->aml = end;
         return_PTR((char *)start);
 }
 
@@ -224,7 +212,7 @@ char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
  *              Arg                 - Where the namepath will be stored
  *              arg_count           - If the namepath points to a control method
  *                                    the method's argument is returned here.
- *              method_call         - Whether the namepath can possibly be the
+ *              possible_method_call - Whether the namepath can possibly be the
  *                                    start of a method call
  *
  * RETURN:      Status
@@ -240,11 +228,11 @@ char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
 acpi_status
 acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
                           struct acpi_parse_state *parser_state,
-                          union acpi_parse_object *arg, u8 method_call)
+                          union acpi_parse_object *arg, u8 possible_method_call)
 {
         char *path;
         union acpi_parse_object *name_op;
-        acpi_status status = AE_OK;
+        acpi_status status;
         union acpi_operand_object *method_desc;
         struct acpi_namespace_node *node;
         union acpi_generic_state scope_info;
@@ -252,115 +240,129 @@ acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
         ACPI_FUNCTION_TRACE("ps_get_next_namepath");
 
         path = acpi_ps_get_next_namestring(parser_state);
+        acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
 
-        /* Null path case is allowed */
+        /* Null path case is allowed, just exit */
 
-        if (path) {
-                /*
-                 * Lookup the name in the internal namespace
-                 */
-                scope_info.scope.node = NULL;
-                node = parser_state->start_node;
-                if (node) {
-                        scope_info.scope.node = node;
-                }
+        if (!path) {
+                arg->common.value.name = path;
+                return_ACPI_STATUS(AE_OK);
+        }
 
-                /*
-                 * Lookup object.  We don't want to add anything new to the namespace
-                 * here, however.  So we use MODE_EXECUTE.  Allow searching of the
-                 * parent tree, but don't open a new scope -- we just want to lookup the
-                 * object  (MUST BE mode EXECUTE to perform upsearch)
-                 */
-                status = acpi_ns_lookup(&scope_info, path, ACPI_TYPE_ANY,
-                                        ACPI_IMODE_EXECUTE,
-                                        ACPI_NS_SEARCH_PARENT |
-                                        ACPI_NS_DONT_OPEN_SCOPE, NULL, &node);
-                if (ACPI_SUCCESS(status) && method_call) {
-                        if (node->type == ACPI_TYPE_METHOD) {
-                                /* This name is actually a control method invocation */
-
-                                method_desc = acpi_ns_get_attached_object(node);
-                                ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
-                                                  "Control Method - %p Desc %p Path=%p\n",
-                                                  node, method_desc, path));
-
-                                name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
-                                if (!name_op) {
-                                        return_ACPI_STATUS(AE_NO_MEMORY);
-                                }
+        /* Setup search scope info */
 
-                                /* Change arg into a METHOD CALL and attach name to it */
+        scope_info.scope.node = NULL;
+        node = parser_state->start_node;
+        if (node) {
+                scope_info.scope.node = node;
+        }
 
-                                acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
-                                name_op->common.value.name = path;
+        /*
+         * Lookup the name in the internal namespace. We don't want to add
+         * anything new to the namespace here, however, so we use MODE_EXECUTE.
+         * Allow searching of the parent tree, but don't open a new scope -
+         * we just want to lookup the object (must be mode EXECUTE to perform
+         * the upsearch)
+         */
+        status =
+            acpi_ns_lookup(&scope_info, path, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
+                           ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
+                           NULL, &node);
 
-                                /* Point METHODCALL/NAME to the METHOD Node */
+        /*
+         * If this name is a control method invocation, we must
+         * setup the method call
+         */
+        if (ACPI_SUCCESS(status) &&
+            possible_method_call && (node->type == ACPI_TYPE_METHOD)) {
+                /* This name is actually a control method invocation */
 
-                                name_op->common.node = node;
-                                acpi_ps_append_arg(arg, name_op);
+                method_desc = acpi_ns_get_attached_object(node);
+                ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
+                                  "Control Method - %p Desc %p Path=%p\n", node,
+                                  method_desc, path));
 
-                                if (!method_desc) {
-                                        ACPI_REPORT_ERROR(("ps_get_next_namepath: Control Method %p has no attached object\n", node));
-                                        return_ACPI_STATUS(AE_AML_INTERNAL);
-                                }
+                name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
+                if (!name_op) {
+                        return_ACPI_STATUS(AE_NO_MEMORY);
+                }
 
-                                ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
-                                                  "Control Method - %p Args %X\n",
-                                                  node,
-                                                  method_desc->method.
-                                                  param_count));
+                /* Change Arg into a METHOD CALL and attach name to it */
 
-                                /* Get the number of arguments to expect */
+                acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
+                name_op->common.value.name = path;
 
-                                walk_state->arg_count =
-                                    method_desc->method.param_count;
-                                return_ACPI_STATUS(AE_OK);
-                        }
+                /* Point METHODCALL/NAME to the METHOD Node */
 
-                        /*
-                         * Else this is normal named object reference.
-                         * Just init the NAMEPATH object with the pathname.
-                         * (See code below)
-                         */
-                }
+                name_op->common.node = node;
+                acpi_ps_append_arg(arg, name_op);
 
-                if (ACPI_FAILURE(status)) {
-                        /*
-                         * 1) Any error other than NOT_FOUND is always severe
-                         * 2) NOT_FOUND is only important if we are executing a method.
-                         * 3) If executing a cond_ref_of opcode, NOT_FOUND is ok.
-                         */
-                        if ((((walk_state->
-                               parse_flags & ACPI_PARSE_MODE_MASK) ==
-                              ACPI_PARSE_EXECUTE) && (status == AE_NOT_FOUND)
-                             && (walk_state->op->common.aml_opcode !=
-                                 AML_COND_REF_OF_OP))
-                            || (status != AE_NOT_FOUND)) {
-                                ACPI_REPORT_NSERROR(path, status);
-
-                                acpi_os_printf
-                                    ("search_node %p start_node %p return_node %p\n",
-                                     scope_info.scope.node,
-                                     parser_state->start_node, node);
-
-                        } else {
-                                /*
-                                 * We got a NOT_FOUND during table load or we encountered
-                                 * a cond_ref_of(x) where the target does not exist.
-                                 * Either case is ok
-                                 */
-                                status = AE_OK;
-                        }
+                if (!method_desc) {
+                        ACPI_ERROR((AE_INFO,
+                                    "Control Method %p has no attached object",
+                                    node));
+                        return_ACPI_STATUS(AE_AML_INTERNAL);
                 }
+
+                ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
+                                  "Control Method - %p Args %X\n",
+                                  node, method_desc->method.param_count));
+
+                /* Get the number of arguments to expect */
+
+                walk_state->arg_count = method_desc->method.param_count;
+                return_ACPI_STATUS(AE_OK);
         }
 
         /*
-         * Regardless of success/failure above,
-         * Just initialize the Op with the pathname.
+         * Special handling if the name was not found during the lookup -
+         * some not_found cases are allowed
          */
-        acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
-        arg->common.value.name = path;
+        if (status == AE_NOT_FOUND) {
+                /* 1) not_found is ok during load pass 1/2 (allow forward references) */
+
+                if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
+                    ACPI_PARSE_EXECUTE) {
+                        status = AE_OK;
+                }
+
+                /* 2) not_found during a cond_ref_of(x) is ok by definition */
+
+                else if (walk_state->op->common.aml_opcode ==
+                         AML_COND_REF_OF_OP) {
+                        status = AE_OK;
+                }
+
+                /*
+                 * 3) not_found while building a Package is ok at this point, we
+                 * may flag as an error later if slack mode is not enabled.
+                 * (Some ASL code depends on allowing this behavior)
+                 */
+                else if ((arg->common.parent) &&
+                         ((arg->common.parent->common.aml_opcode ==
+                           AML_PACKAGE_OP)
+                          || (arg->common.parent->common.aml_opcode ==
+                              AML_VAR_PACKAGE_OP))) {
+                        status = AE_OK;
+                }
+        }
+
+        /* Final exception check (may have been changed from code above) */
 
+        if (ACPI_FAILURE(status)) {
+                ACPI_ERROR_NAMESPACE(path, status);
+
+                if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
+                    ACPI_PARSE_EXECUTE) {
+                        /* Report a control method execution error */
+
+                        status = acpi_ds_method_error(status, walk_state);
+                }
+        }
+
+        /* Save the namepath */
+
+        arg->common.value.name = path;
         return_ACPI_STATUS(status);
 }
 
@@ -382,59 +384,63 @@ void
 acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
                             u32 arg_type, union acpi_parse_object *arg)
 {
+        u32 length;
+        u16 opcode;
+        u8 *aml = parser_state->aml;
 
         ACPI_FUNCTION_TRACE_U32("ps_get_next_simple_arg", arg_type);
 
         switch (arg_type) {
         case ARGP_BYTEDATA:
 
-                acpi_ps_init_op(arg, AML_BYTE_OP);
-                arg->common.value.integer = (u32) ACPI_GET8(parser_state->aml);
-                parser_state->aml++;
+                /* Get 1 byte from the AML stream */
+
+                opcode = AML_BYTE_OP;
+                arg->common.value.integer = (acpi_integer) * aml;
+                length = 1;
                 break;
 
         case ARGP_WORDDATA:
 
-                acpi_ps_init_op(arg, AML_WORD_OP);
-
                 /* Get 2 bytes from the AML stream */
 
-                ACPI_MOVE_16_TO_32(&arg->common.value.integer,
-                                   parser_state->aml);
-                parser_state->aml += 2;
+                opcode = AML_WORD_OP;
+                ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
+                length = 2;
                 break;
 
         case ARGP_DWORDDATA:
 
-                acpi_ps_init_op(arg, AML_DWORD_OP);
-
                 /* Get 4 bytes from the AML stream */
 
-                ACPI_MOVE_32_TO_32(&arg->common.value.integer,
-                                   parser_state->aml);
-                parser_state->aml += 4;
+                opcode = AML_DWORD_OP;
+                ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
+                length = 4;
                 break;
 
         case ARGP_QWORDDATA:
 
-                acpi_ps_init_op(arg, AML_QWORD_OP);
-
                 /* Get 8 bytes from the AML stream */
 
-                ACPI_MOVE_64_TO_64(&arg->common.value.integer,
-                                   parser_state->aml);
-                parser_state->aml += 8;
+                opcode = AML_QWORD_OP;
+                ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
+                length = 8;
                 break;
 
         case ARGP_CHARLIST:
 
-                acpi_ps_init_op(arg, AML_STRING_OP);
-                arg->common.value.string = (char *)parser_state->aml;
+                /* Get a pointer to the string, point past the string */
+
+                opcode = AML_STRING_OP;
+                arg->common.value.string = ACPI_CAST_PTR(char, aml);
 
-                while (ACPI_GET8(parser_state->aml) != '\0') {
-                        parser_state->aml++;
+                /* Find the null terminator */
+
+                length = 0;
+                while (aml[length]) {
+                        length++;
                 }
-                parser_state->aml++;
+                length++;
                 break;
 
         case ARGP_NAME:
@@ -443,14 +449,16 @@ acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
                 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
                 arg->common.value.name =
                     acpi_ps_get_next_namestring(parser_state);
-                break;
+                return_VOID;
 
         default:
 
-                ACPI_REPORT_ERROR(("Invalid arg_type %X\n", arg_type));
-                break;
+                ACPI_ERROR((AE_INFO, "Invalid arg_type %X", arg_type));
+                return_VOID;
         }
 
+        acpi_ps_init_op(arg, opcode);
+        parser_state->aml += length;
         return_VOID;
 }
 
@@ -540,7 +548,7 @@ static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
                  * access_type is first operand, access_attribute is second
                  */
                 field->common.value.integer =
-                    (ACPI_GET8(parser_state->aml) << 8);
+                    (((u32) ACPI_GET8(parser_state->aml) << 8));
                 parser_state->aml++;
                 field->common.value.integer |= ACPI_GET8(parser_state->aml);
                 parser_state->aml++;
@@ -703,7 +711,7 @@ acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
 
         default:
 
-                ACPI_REPORT_ERROR(("Invalid arg_type: %X\n", arg_type));
+                ACPI_ERROR((AE_INFO, "Invalid arg_type: %X", arg_type));
                 status = AE_AML_OPERAND_TYPE;
                 break;
         }