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Diffstat (limited to 'compiler/aslcompiler.y')
| -rw-r--r-- | compiler/aslcompiler.y | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/compiler/aslcompiler.y b/compiler/aslcompiler.y index 5574f8815950..92517a4234cb 100644 --- a/compiler/aslcompiler.y +++ b/compiler/aslcompiler.y @@ -728,6 +728,21 @@ ASLCode | error {YYABORT; $$ = NULL;} ; +/* + * Note concerning support for "module-level code". + * + * ACPI 1.0 allowed Type1 and Type2 executable opcodes outside of control + * methods (the so-called module-level code.) This support was explicitly + * removed in ACPI 2.0, but this type of code continues to be created by + * BIOS vendors. In order to support the disassembly and recompilation of + * such code (and the porting of ASL code to iASL), iASL supports this + * code in violation of the current ACPI specification. + * + * The grammar change to support module-level code is to revert the + * {ObjectList} portion of the DefinitionBlockTerm in ACPI 2.0 to the + * original use of {TermList} instead (see below.) This allows the use + * of Type1 and Type2 opcodes at module level. + */ DefinitionBlockTerm : PARSEOP_DEFINITIONBLOCK '(' {$<n>$ = TrCreateLeafNode (PARSEOP_DEFINITIONBLOCK);} String ',' |