1 files changed, 477 insertions, 186 deletions

diff --git a/arch/microblaze/kernel/cpu/cache.c b/arch/microblaze/kernel/cpu/cache.c
index af866a45012..d9d63831cc2 100644
--- a/arch/microblaze/kernel/cpu/cache.c
+++ b/arch/microblaze/kernel/cpu/cache.c
@@ -3,7 +3,7 @@
  *
  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
  * Copyright (C) 2007-2009 PetaLogix
- * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
+ * Copyright (C) 2007-2009 John Williams <john.williams@petalogix.com>
  *
  * This file is subject to the terms and conditions of the GNU General
  * Public License. See the file COPYING in the main directory of this
@@ -13,243 +13,534 @@
 #include <asm/cacheflush.h>
 #include <linux/cache.h>
 #include <asm/cpuinfo.h>
+#include <asm/pvr.h>
 
-/* Exported functions */
+static inline void __invalidate_flush_icache(unsigned int addr)
+{
+	__asm__ __volatile__ ("wic	%0, r0;"	\
+					: : "r" (addr));
+}
+
+static inline void __flush_dcache(unsigned int addr)
+{
+	__asm__ __volatile__ ("wdc.flush	%0, r0;"	\
+					: : "r" (addr));
+}
+
+static inline void __invalidate_dcache(unsigned int baseaddr,
+						unsigned int offset)
+{
+	__asm__ __volatile__ ("wdc.clear	%0, %1;"	\
+					: : "r" (baseaddr), "r" (offset));
+}
 
-void _enable_icache(void)
+static inline void __enable_icache_msr(void)
 {
-	if (cpuinfo.use_icache) {
-#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
-		__asm__ __volatile__ ("					\
-				msrset	r0, %0;				\
-				nop; "					\
-				:					\
-				: "i" (MSR_ICE)				\
+	__asm__ __volatile__ ("	msrset	r0, %0;		\
+				nop; "			\
+			: : "i" (MSR_ICE) : "memory");
+}
+
+static inline void __disable_icache_msr(void)
+{
+	__asm__ __volatile__ ("	msrclr	r0, %0;		\
+				nop; "			\
+			: : "i" (MSR_ICE) : "memory");
+}
+
+static inline void __enable_dcache_msr(void)
+{
+	__asm__ __volatile__ ("	msrset	r0, %0;		\
+				nop; "			\
+				:			\
+				: "i" (MSR_DCE)		\
 				: "memory");
-#else
-		__asm__ __volatile__ ("					\
-				mfs	r12, rmsr;			\
-				nop;					\
-				ori	r12, r12, %0;			\
-				mts	rmsr, r12;			\
-				nop; "					\
-				:					\
-				: "i" (MSR_ICE)				\
-				: "memory", "r12");
-#endif
-	}
 }
 
-void _disable_icache(void)
+static inline void __disable_dcache_msr(void)
 {
-	if (cpuinfo.use_icache) {
-#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
-		__asm__ __volatile__ ("					\
-				msrclr r0, %0;				\
-				nop; "					\
-				:					\
-				: "i" (MSR_ICE)				\
+	__asm__ __volatile__ ("	msrclr	r0, %0;		\
+				nop; "			\
+				:			\
+				: "i" (MSR_DCE)		\
 				: "memory");
-#else
-		__asm__ __volatile__ ("					\
-				mfs	r12, rmsr;			\
-				nop;					\
-				andi	r12, r12, ~%0;			\
-				mts	rmsr, r12;			\
-				nop; "					\
-				:					\
-				: "i" (MSR_ICE)				\
+}
+
+static inline void __enable_icache_nomsr(void)
+{
+	__asm__ __volatile__ ("	mfs	r12, rmsr;	\
+				nop;			\
+				ori	r12, r12, %0;	\
+				mts	rmsr, r12;	\
+				nop; "			\
+				:			\
+				: "i" (MSR_ICE)		\
 				: "memory", "r12");
-#endif
-	}
 }
 
-void _invalidate_icache(unsigned int addr)
+static inline void __disable_icache_nomsr(void)
 {
-	if (cpuinfo.use_icache) {
-		__asm__ __volatile__ ("					\
-				wic	%0, r0"				\
-				:					\
-				: "r" (addr));
-	}
+	__asm__ __volatile__ ("	mfs	r12, rmsr;	\
+				nop;			\
+				andi	r12, r12, ~%0;	\
+				mts	rmsr, r12;	\
+				nop; "			\
+				:			\
+				: "i" (MSR_ICE)		\
+				: "memory", "r12");
 }
 
-void _enable_dcache(void)
+static inline void __enable_dcache_nomsr(void)
 {
-	if (cpuinfo.use_dcache) {
-#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
-		__asm__ __volatile__ ("					\
-				msrset	r0, %0;				\
-				nop; "					\
-				:					\
-				: "i" (MSR_DCE)				\
-				: "memory");
-#else
-		__asm__ __volatile__ ("					\
-				mfs	r12, rmsr;			\
-				nop;					\
-				ori	r12, r12, %0;			\
-				mts	rmsr, r12;			\
-				nop; "					\
-				:					\
-				: "i" (MSR_DCE)			\
+	__asm__ __volatile__ ("	mfs	r12, rmsr;	\
+				nop;			\
+				ori	r12, r12, %0;	\
+				mts	rmsr, r12;	\
+				nop; "			\
+				:			\
+				: "i" (MSR_DCE)		\
 				: "memory", "r12");
-#endif
-	}
 }
 
-void _disable_dcache(void)
+static inline void __disable_dcache_nomsr(void)
 {
-#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
-		__asm__ __volatile__ ("					\
-				msrclr	r0, %0;				\
-				nop; "					\
-				:					\
-				: "i" (MSR_DCE)			\
-				: "memory");
-#else
-		__asm__ __volatile__ ("					\
-				mfs	r12, rmsr;			\
-				nop;					\
-				andi	r12, r12, ~%0;			\
-				mts	rmsr, r12;			\
-				nop; "					\
-				:					\
-				: "i" (MSR_DCE)			\
+	__asm__ __volatile__ ("	mfs	r12, rmsr;	\
+				nop;			\
+				andi	r12, r12, ~%0;	\
+				mts	rmsr, r12;	\
+				nop; "			\
+				:			\
+				: "i" (MSR_DCE)		\
 				: "memory", "r12");
-#endif
 }
 
-void _invalidate_dcache(unsigned int addr)
+
+/* Helper macro for computing the limits of cache range loops */
+#define CACHE_LOOP_LIMITS(start, end, cache_line_length, cache_size)	\
+do {									\
+	int align = ~(cache_line_length - 1);				\
+	end = min(start + cache_size, end);				\
+	start &= align;							\
+	end = ((end & align) + cache_line_length);			\
+} while (0);
+
+/*
+ * Helper macro to loop over the specified cache_size/line_length and
+ * execute 'op' on that cacheline
+ */
+#define CACHE_ALL_LOOP(cache_size, line_length, op)			\
+do {									\
+	unsigned int len = cache_size;					\
+	int step = -line_length;					\
+	BUG_ON(step >= 0);						\
+									\
+	__asm__ __volatile__ (" 1:      " #op " %0, r0;			\
+					bgtid   %0, 1b;			\
+					addk    %0, %0, %1;		\
+					" : : "r" (len), "r" (step)	\
+					: "memory");			\
+} while (0);
+
+
+#define CACHE_ALL_LOOP2(cache_size, line_length, op)			\
+do {									\
+	unsigned int len = cache_size;					\
+	int step = -line_length;					\
+	BUG_ON(step >= 0);						\
+									\
+	__asm__ __volatile__ (" 1:      " #op " r0, %0;			\
+					bgtid   %0, 1b;			\
+					addk    %0, %0, %1;		\
+					" : : "r" (len), "r" (step)	\
+					: "memory");			\
+} while (0);
+
+/* for wdc.flush/clear */
+#define CACHE_RANGE_LOOP_2(start, end, line_length, op)			\
+do {									\
+	int step = -line_length;					\
+	int count = end - start;					\
+	BUG_ON(count <= 0);						\
+									\
+	__asm__ __volatile__ (" 1:	" #op " %0, %1;			\
+					bgtid   %1, 1b;			\
+					addk    %1, %1, %2;		\
+					" : : "r" (start), "r" (count),	\
+					"r" (step) : "memory");		\
+} while (0);
+
+/* It is used only first parameter for OP - for wic, wdc */
+#define CACHE_RANGE_LOOP_1(start, end, line_length, op)			\
+do {									\
+	int step = -line_length;					\
+	int count = end - start;					\
+	BUG_ON(count <= 0);						\
+									\
+	__asm__ __volatile__ (" 1:	addk	%0, %0, %1;		\
+					" #op " %0, r0;			\
+					bgtid   %1, 1b;			\
+					addk    %1, %1, %2;		\
+					" : : "r" (start), "r" (count),	\
+					"r" (step) : "memory");		\
+} while (0);
+
+static void __flush_icache_range_msr_irq(unsigned long start, unsigned long end)
 {
-		__asm__ __volatile__ ("					\
-				wdc	%0, r0"				\
-				:					\
-				: "r" (addr));
+	unsigned long flags;
+
+	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
+				(unsigned int)start, (unsigned int) end);
+
+	CACHE_LOOP_LIMITS(start, end,
+			cpuinfo.icache_line_length, cpuinfo.icache_size);
+
+	local_irq_save(flags);
+	__disable_icache_msr();
+
+	CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
+
+	__enable_icache_msr();
+	local_irq_restore(flags);
 }
 
-void __invalidate_icache_all(void)
+static void __flush_icache_range_nomsr_irq(unsigned long start,
+				unsigned long end)
 {
-	unsigned int i;
-	unsigned flags;
+	unsigned long flags;
 
-	if (cpuinfo.use_icache) {
-		local_irq_save(flags);
-		__disable_icache();
+	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
+				(unsigned int)start, (unsigned int) end);
 
-		/* Just loop through cache size and invalidate, no need to add
-			CACHE_BASE address */
-		for (i = 0; i < cpuinfo.icache_size;
-			i += cpuinfo.icache_line)
-				__invalidate_icache(i);
+	CACHE_LOOP_LIMITS(start, end,
+			cpuinfo.icache_line_length, cpuinfo.icache_size);
 
-		__enable_icache();
-		local_irq_restore(flags);
-	}
+	local_irq_save(flags);
+	__disable_icache_nomsr();
+
+	CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
+
+	__enable_icache_nomsr();
+	local_irq_restore(flags);
 }
 
-void __invalidate_icache_range(unsigned long start, unsigned long end)
+static void __flush_icache_range_noirq(unsigned long start,
+				unsigned long end)
 {
-	unsigned int i;
-	unsigned flags;
-	unsigned int align;
-
-	if (cpuinfo.use_icache) {
-		/*
-		 * No need to cover entire cache range,
-		 * just cover cache footprint
-		 */
-		end = min(start + cpuinfo.icache_size, end);
-		align = ~(cpuinfo.icache_line - 1);
-		start &= align; /* Make sure we are aligned */
-		/* Push end up to the next cache line */
-		end = ((end & align) + cpuinfo.icache_line);
-
-		local_irq_save(flags);
-		__disable_icache();
-
-		for (i = start; i < end; i += cpuinfo.icache_line)
-			__invalidate_icache(i);
-
-		__enable_icache();
-		local_irq_restore(flags);
-	}
+	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
+				(unsigned int)start, (unsigned int) end);
+
+	CACHE_LOOP_LIMITS(start, end,
+			cpuinfo.icache_line_length, cpuinfo.icache_size);
+	CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
+}
+
+static void __flush_icache_all_msr_irq(void)
+{
+	unsigned long flags;
+
+	pr_debug("%s\n", __func__);
+
+	local_irq_save(flags);
+	__disable_icache_msr();
+
+	CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
+
+	__enable_icache_msr();
+	local_irq_restore(flags);
+}
+
+static void __flush_icache_all_nomsr_irq(void)
+{
+	unsigned long flags;
+
+	pr_debug("%s\n", __func__);
+
+	local_irq_save(flags);
+	__disable_icache_nomsr();
+
+	CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
+
+	__enable_icache_nomsr();
+	local_irq_restore(flags);
 }
 
-void __invalidate_icache_page(struct vm_area_struct *vma, struct page *page)
+static void __flush_icache_all_noirq(void)
 {
-	__invalidate_icache_all();
+	pr_debug("%s\n", __func__);
+	CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
 }
 
-void __invalidate_icache_user_range(struct vm_area_struct *vma,
-				struct page *page, unsigned long adr,
-				int len)
+static void __invalidate_dcache_all_msr_irq(void)
 {
-	__invalidate_icache_all();
+	unsigned long flags;
+
+	pr_debug("%s\n", __func__);
+
+	local_irq_save(flags);
+	__disable_dcache_msr();
+
+	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
+
+	__enable_dcache_msr();
+	local_irq_restore(flags);
 }
 
-void __invalidate_cache_sigtramp(unsigned long addr)
+static void __invalidate_dcache_all_nomsr_irq(void)
 {
-	__invalidate_icache_range(addr, addr + 8);
+	unsigned long flags;
+
+	pr_debug("%s\n", __func__);
+
+	local_irq_save(flags);
+	__disable_dcache_nomsr();
+
+	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
+
+	__enable_dcache_nomsr();
+	local_irq_restore(flags);
 }
 
-void __invalidate_dcache_all(void)
+static void __invalidate_dcache_all_noirq_wt(void)
 {
-	unsigned int i;
-	unsigned flags;
-
-	if (cpuinfo.use_dcache) {
-		local_irq_save(flags);
-		__disable_dcache();
-
-		/*
-		 * Just loop through cache size and invalidate,
-		 * no need to add CACHE_BASE address
-		 */
-		for (i = 0; i < cpuinfo.dcache_size;
-			i += cpuinfo.dcache_line)
-				__invalidate_dcache(i);
-
-		__enable_dcache();
-		local_irq_restore(flags);
-	}
+	pr_debug("%s\n", __func__);
+	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc)
 }
 
-void __invalidate_dcache_range(unsigned long start, unsigned long end)
+/* FIXME this is weird - should be only wdc but not work
+ * MS: I am getting bus errors and other weird things */
+static void __invalidate_dcache_all_wb(void)
 {
+	pr_debug("%s\n", __func__);
+	CACHE_ALL_LOOP2(cpuinfo.dcache_size, cpuinfo.dcache_line_length,
+					wdc.clear)
+
+#if 0
 	unsigned int i;
-	unsigned flags;
-	unsigned int align;
-
-	if (cpuinfo.use_dcache) {
-		/*
-		 * No need to cover entire cache range,
-		 * just cover cache footprint
-		 */
-		end = min(start + cpuinfo.dcache_size, end);
-		align = ~(cpuinfo.dcache_line - 1);
-		start &= align; /* Make sure we are aligned */
-		/* Push end up to the next cache line */
-		end = ((end & align) + cpuinfo.dcache_line);
-		local_irq_save(flags);
-		__disable_dcache();
-
-		for (i = start; i < end; i += cpuinfo.dcache_line)
-			__invalidate_dcache(i);
-
-		__enable_dcache();
-		local_irq_restore(flags);
-	}
+
+	pr_debug("%s\n", __func__);
+
+	/* Just loop through cache size and invalidate it */
+	for (i = 0; i < cpuinfo.dcache_size; i += cpuinfo.dcache_line_length)
+			__invalidate_dcache(0, i);
+#endif
+}
+
+static void __invalidate_dcache_range_wb(unsigned long start,
+						unsigned long end)
+{
+	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
+				(unsigned int)start, (unsigned int) end);
+
+	CACHE_LOOP_LIMITS(start, end,
+			cpuinfo.dcache_line_length, cpuinfo.dcache_size);
+	CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.clear);
+}
+
+static void __invalidate_dcache_range_nomsr_wt(unsigned long start,
+							unsigned long end)
+{
+	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
+				(unsigned int)start, (unsigned int) end);
+	CACHE_LOOP_LIMITS(start, end,
+			cpuinfo.dcache_line_length, cpuinfo.dcache_size);
+
+	CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
 }
 
-void __invalidate_dcache_page(struct vm_area_struct *vma, struct page *page)
+static void __invalidate_dcache_range_msr_irq_wt(unsigned long start,
+							unsigned long end)
 {
-	__invalidate_dcache_all();
+	unsigned long flags;
+
+	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
+				(unsigned int)start, (unsigned int) end);
+	CACHE_LOOP_LIMITS(start, end,
+			cpuinfo.dcache_line_length, cpuinfo.dcache_size);
+
+	local_irq_save(flags);
+	__disable_dcache_msr();
+
+	CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
+
+	__enable_dcache_msr();
+	local_irq_restore(flags);
+}
+
+static void __invalidate_dcache_range_nomsr_irq(unsigned long start,
+							unsigned long end)
+{
+	unsigned long flags;
+
+	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
+				(unsigned int)start, (unsigned int) end);
+
+	CACHE_LOOP_LIMITS(start, end,
+			cpuinfo.dcache_line_length, cpuinfo.dcache_size);
+
+	local_irq_save(flags);
+	__disable_dcache_nomsr();
+
+	CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
+
+	__enable_dcache_nomsr();
+	local_irq_restore(flags);
+}
+
+static void __flush_dcache_all_wb(void)
+{
+	pr_debug("%s\n", __func__);
+	CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length,
+				wdc.flush);
 }
 
-void __invalidate_dcache_user_range(struct vm_area_struct *vma,
-				struct page *page, unsigned long adr,
-				int len)
+static void __flush_dcache_range_wb(unsigned long start, unsigned long end)
 {
-	__invalidate_dcache_all();
+	pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
+				(unsigned int)start, (unsigned int) end);
+
+	CACHE_LOOP_LIMITS(start, end,
+			cpuinfo.dcache_line_length, cpuinfo.dcache_size);
+	CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.flush);
+}
+
+/* struct for wb caches and for wt caches */
+struct scache *mbc;
+
+/* new wb cache model */
+const struct scache wb_msr = {
+	.ie = __enable_icache_msr,
+	.id = __disable_icache_msr,
+	.ifl = __flush_icache_all_noirq,
+	.iflr = __flush_icache_range_noirq,
+	.iin = __flush_icache_all_noirq,
+	.iinr = __flush_icache_range_noirq,
+	.de = __enable_dcache_msr,
+	.dd = __disable_dcache_msr,
+	.dfl = __flush_dcache_all_wb,
+	.dflr = __flush_dcache_range_wb,
+	.din = __invalidate_dcache_all_wb,
+	.dinr = __invalidate_dcache_range_wb,
+};
+
+/* There is only difference in ie, id, de, dd functions */
+const struct scache wb_nomsr = {
+	.ie = __enable_icache_nomsr,
+	.id = __disable_icache_nomsr,
+	.ifl = __flush_icache_all_noirq,
+	.iflr = __flush_icache_range_noirq,
+	.iin = __flush_icache_all_noirq,
+	.iinr = __flush_icache_range_noirq,
+	.de = __enable_dcache_nomsr,
+	.dd = __disable_dcache_nomsr,
+	.dfl = __flush_dcache_all_wb,
+	.dflr = __flush_dcache_range_wb,
+	.din = __invalidate_dcache_all_wb,
+	.dinr = __invalidate_dcache_range_wb,
+};
+
+/* Old wt cache model with disabling irq and turn off cache */
+const struct scache wt_msr = {
+	.ie = __enable_icache_msr,
+	.id = __disable_icache_msr,
+	.ifl = __flush_icache_all_msr_irq,
+	.iflr = __flush_icache_range_msr_irq,
+	.iin = __flush_icache_all_msr_irq,
+	.iinr = __flush_icache_range_msr_irq,
+	.de = __enable_dcache_msr,
+	.dd = __disable_dcache_msr,
+	.dfl = __invalidate_dcache_all_msr_irq,
+	.dflr = __invalidate_dcache_range_msr_irq_wt,
+	.din = __invalidate_dcache_all_msr_irq,
+	.dinr = __invalidate_dcache_range_msr_irq_wt,
+};
+
+const struct scache wt_nomsr = {
+	.ie = __enable_icache_nomsr,
+	.id = __disable_icache_nomsr,
+	.ifl = __flush_icache_all_nomsr_irq,
+	.iflr = __flush_icache_range_nomsr_irq,
+	.iin = __flush_icache_all_nomsr_irq,
+	.iinr = __flush_icache_range_nomsr_irq,
+	.de = __enable_dcache_nomsr,
+	.dd = __disable_dcache_nomsr,
+	.dfl = __invalidate_dcache_all_nomsr_irq,
+	.dflr = __invalidate_dcache_range_nomsr_irq,
+	.din = __invalidate_dcache_all_nomsr_irq,
+	.dinr = __invalidate_dcache_range_nomsr_irq,
+};
+
+/* New wt cache model for newer Microblaze versions */
+const struct scache wt_msr_noirq = {
+	.ie = __enable_icache_msr,
+	.id = __disable_icache_msr,
+	.ifl = __flush_icache_all_noirq,
+	.iflr = __flush_icache_range_noirq,
+	.iin = __flush_icache_all_noirq,
+	.iinr = __flush_icache_range_noirq,
+	.de = __enable_dcache_msr,
+	.dd = __disable_dcache_msr,
+	.dfl = __invalidate_dcache_all_noirq_wt,
+	.dflr = __invalidate_dcache_range_nomsr_wt,
+	.din = __invalidate_dcache_all_noirq_wt,
+	.dinr = __invalidate_dcache_range_nomsr_wt,
+};
+
+const struct scache wt_nomsr_noirq = {
+	.ie = __enable_icache_nomsr,
+	.id = __disable_icache_nomsr,
+	.ifl = __flush_icache_all_noirq,
+	.iflr = __flush_icache_range_noirq,
+	.iin = __flush_icache_all_noirq,
+	.iinr = __flush_icache_range_noirq,
+	.de = __enable_dcache_nomsr,
+	.dd = __disable_dcache_nomsr,
+	.dfl = __invalidate_dcache_all_noirq_wt,
+	.dflr = __invalidate_dcache_range_nomsr_wt,
+	.din = __invalidate_dcache_all_noirq_wt,
+	.dinr = __invalidate_dcache_range_nomsr_wt,
+};
+
+/* CPU version code for 7.20.c - see arch/microblaze/kernel/cpu/cpuinfo.c */
+#define CPUVER_7_20_A	0x0c
+#define CPUVER_7_20_D	0x0f
+
+#define INFO(s)	printk(KERN_INFO "cache: " s " \n");
+
+void microblaze_cache_init(void)
+{
+	if (cpuinfo.use_instr & PVR2_USE_MSR_INSTR) {
+		if (cpuinfo.dcache_wb) {
+			INFO("wb_msr");
+			mbc = (struct scache *)&wb_msr;
+			if (cpuinfo.ver_code < CPUVER_7_20_D) {
+				/* MS: problem with signal handling - hw bug */
+				INFO("WB won't work properly");
+			}
+		} else {
+			if (cpuinfo.ver_code >= CPUVER_7_20_A) {
+				INFO("wt_msr_noirq");
+				mbc = (struct scache *)&wt_msr_noirq;
+			} else {
+				INFO("wt_msr");
+				mbc = (struct scache *)&wt_msr;
+			}
+		}
+	} else {
+		if (cpuinfo.dcache_wb) {
+			INFO("wb_nomsr");
+			mbc = (struct scache *)&wb_nomsr;
+			if (cpuinfo.ver_code < CPUVER_7_20_D) {
+				/* MS: problem with signal handling - hw bug */
+				INFO("WB won't work properly");
+			}
+		} else {
+			if (cpuinfo.ver_code >= CPUVER_7_20_A) {
+				INFO("wt_nomsr_noirq");
+				mbc = (struct scache *)&wt_nomsr_noirq;
+			} else {
+				INFO("wt_nomsr");
+				mbc = (struct scache *)&wt_nomsr;
+			}
+		}
+	}
 }