[ACPI] Test raw pointer to the EC region

Author: binarymaster

drivers/bus/acpi/acpica/events/evhandler.c

@@ -458,6 +458,12 @@ AcpiEvInstallSpaceHandler (
             Setup   = AcpiEvDataTableRegionSetup;
             break;
 
+        case ACPI_ADR_SPACE_EC:
+
+            Handler = AcpiExEcSpaceHandler;
+            Setup = AcpiEvEcRegionSetup;
+            break;
+
         default:
 
             Status = AE_BAD_PARAMETER;

drivers/bus/acpi/acpica/events/evrgnini.c

@@ -721,3 +721,20 @@ AcpiEvInitializeRegion (
 
     return_ACPI_STATUS (AE_OK);
 }
+
+ACPI_STATUS
+AcpiEvEcRegionSetup(ACPI_HANDLE Handle, UINT32 Function, void *HandlerContext, void **RegionContext)
+{
+    ACPI_FUNCTION_TRACE(EvEcRegionSetup);
+
+    if (Function == ACPI_REGION_DEACTIVATE)
+    {
+        *RegionContext = NULL;
+    }
+    else
+    {
+        *RegionContext = HandlerContext;
+    }
+
+    return_ACPI_STATUS(AE_OK);
+}

drivers/bus/acpi/acpica/executer/exregion.c

@@ -618,3 +618,44 @@ AcpiExDataTableSpaceHandler (
 
     return_ACPI_STATUS (AE_OK);
 }
+
+ACPI_STATUS
+AcpiExEcSpaceHandler(
+    UINT32 Function,
+    ACPI_PHYSICAL_ADDRESS Address,
+    UINT32 BitWidth,
+    UINT64 *Value,
+    void *HandlerContext,
+    void *RegionContext)
+{
+    ACPI_DATA_TABLE_MAPPING *Mapping;
+    char *Pointer;
+
+    ACPI_FUNCTION_TRACE(ExEcSpaceHandler);
+
+    Mapping = (ACPI_DATA_TABLE_MAPPING *)RegionContext;
+    Pointer = ACPI_CAST_PTR(char, Mapping->Pointer) + (Address - ACPI_PTR_TO_PHYSADDR(Mapping->Pointer));
+
+    /*
+     * Perform the memory read or write. The BitWidth was already
+     * validated.
+     */
+    switch (Function)
+    {
+        case ACPI_READ:
+
+            memcpy(ACPI_CAST_PTR(char, Value), Pointer, ACPI_DIV_8(BitWidth));
+            break;
+
+        case ACPI_WRITE:
+
+            memcpy(Pointer, ACPI_CAST_PTR(char, Value), ACPI_DIV_8(BitWidth));
+            break;
+
+        default:
+
+            return_ACPI_STATUS(AE_BAD_PARAMETER);
+    }
+
+    return_ACPI_STATUS(AE_OK);
+}

drivers/bus/acpi/acpica/include/acevents.h

@@ -356,6 +356,10 @@ AcpiEvDataTableRegionSetup (
     void                    *HandlerContext,
     void                    **RegionContext);
 
+ACPI_STATUS
+AcpiEvEcRegionSetup(ACPI_HANDLE Handle, UINT32 Function, void *HandlerContext, void **RegionContext);
+
+
 ACPI_STATUS
 AcpiEvDefaultRegionSetup (
     ACPI_HANDLE             Handle,

drivers/bus/acpi/acpica/include/acinterp.h

@@ -781,4 +781,13 @@ AcpiExDataTableSpaceHandler (
     void                    *HandlerContext,
     void                    *RegionContext);
 
+ACPI_STATUS
+AcpiExEcSpaceHandler(
+    UINT32 Function,
+    ACPI_PHYSICAL_ADDRESS Address,
+    UINT32 BitWidth,
+    UINT64 *Value,
+    void *HandlerContext,
+    void *RegionContext);
+
 #endif /* __INTERP_H__ */