Introduce inheritance into the PowerPC MMU kobj interface.

include/mmuvar.h - Change the MMU_DEF macro to also create the class
definition as well as define the DATA_SET. Add a macro, MMU_DEF_INHERIT,
which has an extra parameter specifying the MMU class to inherit methods
from. Update the comments at the start of the header file to describe the
new macros.

booke/pmap.c
aim/mmu_oea.c
aim/mmu_oea64.c - Collapse mmu_def_t declaration into updated MMU_DEF macro

The MMU_DEF_INHERIT macro will be used in the PS3 MMU implementation to
allow it to inherit the stock powerpc64 MMU methods.

Reviewed by:	nwhitehorn

4 files changed, 34 insertions, 26 deletions

diff --git a/sys/powerpc/aim/mmu_oea.c b/sys/powerpc/aim/mmu_oea.c
index 2ade00f..a31e072 100644
--- a/sys/powerpc/aim/mmu_oea.c
+++ b/sys/powerpc/aim/mmu_oea.c
@@ -379,12 +379,8 @@ static mmu_method_t moea_methods[] = {
 	{ 0, 0 }
 };
 
-static mmu_def_t oea_mmu = {
-	MMU_TYPE_OEA,
-	moea_methods,
-	0
-};
-MMU_DEF(oea_mmu);
+MMU_DEF(oea_mmu, MMU_TYPE_OEA, moea_methods, 0);
+
 
 static void
 tlbie(vm_offset_t va)
diff --git a/sys/powerpc/aim/mmu_oea64.c b/sys/powerpc/aim/mmu_oea64.c
index dc055a3..6328e57 100644
--- a/sys/powerpc/aim/mmu_oea64.c
+++ b/sys/powerpc/aim/mmu_oea64.c
@@ -474,12 +474,7 @@ static mmu_method_t moea64_methods[] = {
 	{ 0, 0 }
 };
 
-static mmu_def_t oea64_mmu = {
-	MMU_TYPE_G5,
-	moea64_methods,
-	0
-};
-MMU_DEF(oea64_mmu);
+MMU_DEF(oea64_mmu, MMU_TYPE_G5, moea64_methods, 0);
 
 static __inline u_int
 va_to_pteg(uint64_t vsid, vm_offset_t addr, int large)
diff --git a/sys/powerpc/booke/pmap.c b/sys/powerpc/booke/pmap.c
index 7f2feb9..c5e285c 100644
--- a/sys/powerpc/booke/pmap.c
+++ b/sys/powerpc/booke/pmap.c
@@ -384,12 +384,7 @@ static mmu_method_t mmu_booke_methods[] = {
 	{ 0, 0 }
 };
 
-static mmu_def_t booke_mmu = {
-	MMU_TYPE_BOOKE,
-	mmu_booke_methods,
-	0
-};
-MMU_DEF(booke_mmu);
+MMU_DEF(booke_mmu, MMU_TYPE_BOOKE, mmu_booke_methods, 0);
 
 static inline void
 tlb_miss_lock(void)
diff --git a/sys/powerpc/include/mmuvar.h b/sys/powerpc/include/mmuvar.h
index 6e5a213..821a497 100644
--- a/sys/powerpc/include/mmuvar.h
+++ b/sys/powerpc/include/mmuvar.h
@@ -31,7 +31,8 @@
 
 /*
  * A PowerPC MMU implementation is declared with a kernel object and
- * an associated method table, similar to a device driver.
+ * an associated method table. The MMU_DEF macro is used to declare
+ * the class, and also links it to the global MMU class list.
  *
  * e.g.
  *
@@ -44,13 +45,12 @@
  *	{ 0, 0 }
  * };
  *
- * static mmu_def_t ppc8xx_mmu = {
- * 	"ppc8xx",
- *	ppc8xx_methods,
- *	sizeof(ppc8xx_mmu_softc),	// or 0 if no softc
- * };
+ * MMU_DEF(ppc8xx, MMU_TYPE_8xx, ppc8xx_methods, sizeof(ppc8xx_mmu_softc));
+ *
+ * A single level of inheritance is supported in a similar fashion to
+ * kobj inheritance e.g.
  *
- * MMU_DEF(ppc8xx_mmu);
+ * MMU_DEF_1(ppc860c, MMU_TYPE_860c, ppc860c_methods, 0, ppc8xx);
  */
 
 #include <sys/kobj.h>
@@ -84,7 +84,29 @@ typedef struct kobj_class	mmu_def_t;
 
 #define MMUMETHOD	KOBJMETHOD
 
-#define MMU_DEF(name)	DATA_SET(mmu_set, name)
+#define MMU_DEF(name, ident, methods, size)	\
+						\
+mmu_def_t name = {				\
+	ident, methods, size, NULL		\
+};						\
+DATA_SET(mmu_set, name)
+
+#define MMU_DEF_INHERIT(name, ident, methods, size, base1)	\
+						\
+static kobj_class_t name ## _baseclasses[] =	\
+       	{ &base1, NULL };			\
+mmu_def_t name = {                              \
+	ident, methods, size, name ## _baseclasses	\
+};                                              \
+DATA_SET(mmu_set, name)
+
+
+#if 0
+mmu_def_t name = {				\
+	ident, methods, size, name ## _baseclasses	\
+};						
+DATA_SET(mmu_set, name)
+#endif
 
 /*
  * Known MMU names