vendor/acpica/20140325

1 files changed, 42 insertions, 0 deletions

diff --git a/source/compiler/aslmain.c b/source/compiler/aslmain.c
index 6f81d21d2c05..6e92d53d54e5 100644
--- a/source/compiler/aslmain.c
+++ b/source/compiler/aslmain.c
@@ -73,6 +73,36 @@ static void
 AslInitialize (
     void);
 
+UINT8
+AcpiIsBigEndianMachine (
+    void);
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiIsBigEndianMachine
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      TRUE if machine is big endian
+ *              FALSE if machine is little endian
+ *
+ * DESCRIPTION: Detect whether machine is little endian or big endian.
+ *
+ ******************************************************************************/
+
+UINT8
+AcpiIsBigEndianMachine (
+    void)
+{
+    union {
+        UINT32              Integer;
+        UINT8               Bytes[4];
+    } Overlay = {0xFF000000};
+
+    return (Overlay.Bytes[0]); /* Returns 0xFF (TRUE) for big endian */
+}
+
 
 /*******************************************************************************
  *
@@ -299,6 +329,18 @@ main (
     int                     Index2;
 
 
+    /*
+     * Big-endian machines are not currently supported. ACPI tables must
+     * be little-endian, and support for big-endian machines needs to
+     * be implemented.
+     */
+    if (AcpiIsBigEndianMachine ())
+    {
+        fprintf (stderr,
+            "iASL is not currently supported on big-endian machines.\n");
+        return (-1);
+    }
+
     ACPI_DEBUG_INITIALIZE (); /* For debug version only */
 
     /* Initialize preprocessor and compiler before command line processing */