On 88100-based systems, take the two hardwired BATC into account in

pmap_extract(), and do not bother creating regular page table mappings
for obio regions which are covered by these BATC entries.

2 files changed, 30 insertions, 4 deletions

diff --git a/sys/arch/m88k/include/m8820x.h b/sys/arch/m88k/include/m8820x.h
index 2b2421c76e0..d83ea886484 100644
--- a/sys/arch/m88k/include/m8820x.h
+++ b/sys/arch/m88k/include/m8820x.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: m8820x.h,v 1.6 2005/12/04 12:20:19 miod Exp $ */
+/*	$OpenBSD: m8820x.h,v 1.7 2006/05/06 16:59:26 miod Exp $ */
 /*
  * Copyright (c) 2004, Miodrag Vallat.
  *
@@ -169,6 +169,16 @@
 #define	MC88200_CACHE_SHIFT	4
 #define	MC88200_CACHE_LINE	(1 << MC88200_CACHE_SHIFT)
 
+/*
+ * Hardwired BATC information
+ */
+
+#define	BATC8			0xfff7ffb5
+#define	BATC9			0xfffffff5
+
+#define	BATC8_VA		0xfff00000
+#define	BATC9_VA		0xfff80000
+
 #define NBSG    	(1 << (PDT_BITS + PG_BITS))	/* segment size */
 
 #ifndef _LOCORE
@@ -193,8 +203,8 @@ extern struct m8820x_cmmu m8820x_cmmu[MAX_CMMUS];
 extern u_int cmmu_shift;
 extern u_int max_cmmus;
 
-void m8820x_setup_board_config(void);
-cpuid_t m8820x_cpu_number(void);
+void	m8820x_setup_board_config(void);
+cpuid_t	m8820x_cpu_number(void);
 
 #endif	/* _LOCORE */
 #endif	/* __M88K_M8820X_H__ */
diff --git a/sys/arch/m88k/m88k/pmap.c b/sys/arch/m88k/m88k/pmap.c
index 99f16d2a14f..9f48e4feb34 100644
--- a/sys/arch/m88k/m88k/pmap.c
+++ b/sys/arch/m88k/m88k/pmap.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pmap.c,v 1.22 2006/04/26 20:38:37 miod Exp $	*/
+/*	$OpenBSD: pmap.c,v 1.23 2006/05/06 16:59:28 miod Exp $	*/
 /*
  * Copyright (c) 2001-2004, Miodrag Vallat
  * Copyright (c) 1998-2001 Steve Murphree, Jr.
@@ -58,6 +58,9 @@
 #include <machine/cpu.h>
 #include <machine/lock.h>
 #include <machine/pmap_table.h>
+#ifdef M88100
+#include <machine/m8820x.h>
+#endif
 
 #include <uvm/uvm.h>
 
@@ -1860,6 +1863,19 @@ pmap_extract(pmap_t pmap, vaddr_t va, paddr_t *pap)
 		panic("pmap_extract: pmap is NULL");
 #endif
 
+#ifdef M88100
+	/*
+	 * 88100-based designs have two hardwired BATC entries which map
+	 * the upper 1MB 1:1 in supervisor space.
+	 */
+	if (CPU_IS88100) {
+		if (va >= BATC8_VA && pmap == pmap_kernel()) {
+			*pap = va;
+			return (TRUE);
+		}
+	}
+#endif
+
 	spl = splvm();
 	PMAP_LOCK(pmap);