--- a/src/m/powerpc.h	Mon Aug 13 11:19:22 2007 +0200
+++ b/src/m/powerpc.h	Mon Aug 13 11:20:41 2007 +0200
@@ -43,6 +43,10 @@
 # endif
 #endif
 
+/* XINT must explicitly sign-extend */
+
+#define EXPLICIT_SIGN_EXTEND
+
 #ifndef __linux__
 /* Data type of load average, as read out of kmem.  */
 
@@ -62,12 +66,32 @@
 
 #define NO_REMAP
 
+#if 0
+#define TEXT_START 0x00001000
+#define TEXT_END 0
+#define DATA_START 0x01000000
+#define DATA_END 0
+
+/* The data segment in this machine always starts at address 0x10000000.
+   An address of data cannot be stored correctly in a Lisp object;
+   we always lose the high bits.  We must tell XPNTR to add them back.	*/
+
+#define DATA_SEG_BITS 0x10000000
+#endif
+
 /* Use type int rather than a union, to represent Lisp_Object */
 
 /* #define NO_UNION_TYPE */
 
 #ifdef CANNOT_DUMP
+/* Define shared memory segment symbols */
 
+#define PURE_SEG_BITS 0x30000000
+
+/* Use shared memory.  */
+/* This is turned off because it does not always work.	See etc/AIX.DUMP.  */
+/* #define HAVE_SHM */
+#define SHMKEY 5305035		/* used for shared memory code segments */
 #endif /* CANNOT_DUMP */
 
 #define N_BADMAG(x) BADMAG(x)