Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2087 insertions, 0 deletions

diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
new file mode 100644
index 000000000..60fe72170
--- /dev/null
+++ b/arch/mips/mm/c-r4k.c
@@ -0,0 +1,2087 @@
+/*
+ * 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 archive
+ * for more details.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org)
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ */
+#include <linux/cpu_pm.h>
+#include <linux/hardirq.h>
+#include <linux/init.h>
+#include <linux/highmem.h>
+#include <linux/kernel.h>
+#include <linux/linkage.h>
+#include <linux/preempt.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/mm.h>
+#include <linux/export.h>
+#include <linux/bitops.h>
+
+#include <asm/bcache.h>
+#include <asm/bootinfo.h>
+#include <asm/cache.h>
+#include <asm/cacheops.h>
+#include <asm/cpu.h>
+#include <asm/cpu-features.h>
+#include <asm/cpu-type.h>
+#include <asm/io.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/r4kcache.h>
+#include <asm/sections.h>
+#include <asm/mmu_context.h>
+#include <asm/war.h>
+#include <asm/cacheflush.h> /* for run_uncached() */
+#include <asm/traps.h>
+#include <asm/dma-coherence.h>
+#include <asm/mips-cps.h>
+
+/*
+ * Bits describing what cache ops an SMP callback function may perform.
+ *
+ * R4K_HIT   -	Virtual user or kernel address based cache operations. The
+ *		active_mm must be checked before using user addresses, falling
+ *		back to kmap.
+ * R4K_INDEX -	Index based cache operations.
+ */
+
+#define R4K_HIT		BIT(0)
+#define R4K_INDEX	BIT(1)
+
+/**
+ * r4k_op_needs_ipi() - Decide if a cache op needs to be done on every core.
+ * @type:	Type of cache operations (R4K_HIT or R4K_INDEX).
+ *
+ * Decides whether a cache op needs to be performed on every core in the system.
+ * This may change depending on the @type of cache operation, as well as the set
+ * of online CPUs, so preemption should be disabled by the caller to prevent CPU
+ * hotplug from changing the result.
+ *
+ * Returns:	1 if the cache operation @type should be done on every core in
+ *		the system.
+ *		0 if the cache operation @type is globalized and only needs to
+ *		be performed on a simple CPU.
+ */
+static inline bool r4k_op_needs_ipi(unsigned int type)
+{
+	/* The MIPS Coherence Manager (CM) globalizes address-based cache ops */
+	if (type == R4K_HIT && mips_cm_present())
+		return false;
+
+	/*
+	 * Hardware doesn't globalize the required cache ops, so SMP calls may
+	 * be needed, but only if there are foreign CPUs (non-siblings with
+	 * separate caches).
+	 */
+	/* cpu_foreign_map[] undeclared when !CONFIG_SMP */
+#ifdef CONFIG_SMP
+	return !cpumask_empty(&cpu_foreign_map[0]);
+#else
+	return false;
+#endif
+}
+
+/*
+ * Special Variant of smp_call_function for use by cache functions:
+ *
+ *  o No return value
+ *  o collapses to normal function call on UP kernels
+ *  o collapses to normal function call on systems with a single shared
+ *    primary cache.
+ *  o doesn't disable interrupts on the local CPU
+ */
+static inline void r4k_on_each_cpu(unsigned int type,
+				   void (*func)(void *info), void *info)
+{
+	preempt_disable();
+	if (r4k_op_needs_ipi(type))
+		smp_call_function_many(&cpu_foreign_map[smp_processor_id()],
+				       func, info, 1);
+	func(info);
+	preempt_enable();
+}
+
+/*
+ * Must die.
+ */
+static unsigned long icache_size __read_mostly;
+static unsigned long dcache_size __read_mostly;
+static unsigned long vcache_size __read_mostly;
+static unsigned long scache_size __read_mostly;
+
+/*
+ * Dummy cache handling routines for machines without boardcaches
+ */
+static void cache_noop(void) {}
+
+static struct bcache_ops no_sc_ops = {
+	.bc_enable = (void *)cache_noop,
+	.bc_disable = (void *)cache_noop,
+	.bc_wback_inv = (void *)cache_noop,
+	.bc_inv = (void *)cache_noop
+};
+
+struct bcache_ops *bcops = &no_sc_ops;
+
+#define cpu_is_r4600_v1_x()	((read_c0_prid() & 0xfffffff0) == 0x00002010)
+#define cpu_is_r4600_v2_x()	((read_c0_prid() & 0xfffffff0) == 0x00002020)
+
+#define R4600_HIT_CACHEOP_WAR_IMPL					\
+do {									\
+	if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x())		\
+		*(volatile unsigned long *)CKSEG1;			\
+	if (R4600_V1_HIT_CACHEOP_WAR)					\
+		__asm__ __volatile__("nop;nop;nop;nop");		\
+} while (0)
+
+static void (*r4k_blast_dcache_page)(unsigned long addr);
+
+static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
+{
+	R4600_HIT_CACHEOP_WAR_IMPL;
+	blast_dcache32_page(addr);
+}
+
+static inline void r4k_blast_dcache_page_dc64(unsigned long addr)
+{
+	blast_dcache64_page(addr);
+}
+
+static inline void r4k_blast_dcache_page_dc128(unsigned long addr)
+{
+	blast_dcache128_page(addr);
+}
+
+static void r4k_blast_dcache_page_setup(void)
+{
+	unsigned long  dc_lsize = cpu_dcache_line_size();
+
+	switch (dc_lsize) {
+	case 0:
+		r4k_blast_dcache_page = (void *)cache_noop;
+		break;
+	case 16:
+		r4k_blast_dcache_page = blast_dcache16_page;
+		break;
+	case 32:
+		r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
+		break;
+	case 64:
+		r4k_blast_dcache_page = r4k_blast_dcache_page_dc64;
+		break;
+	case 128:
+		r4k_blast_dcache_page = r4k_blast_dcache_page_dc128;
+		break;
+	default:
+		break;
+	}
+}
+
+#ifndef CONFIG_EVA
+#define r4k_blast_dcache_user_page  r4k_blast_dcache_page
+#else
+
+static void (*r4k_blast_dcache_user_page)(unsigned long addr);
+
+static void r4k_blast_dcache_user_page_setup(void)
+{
+	unsigned long  dc_lsize = cpu_dcache_line_size();
+
+	if (dc_lsize == 0)
+		r4k_blast_dcache_user_page = (void *)cache_noop;
+	else if (dc_lsize == 16)
+		r4k_blast_dcache_user_page = blast_dcache16_user_page;
+	else if (dc_lsize == 32)
+		r4k_blast_dcache_user_page = blast_dcache32_user_page;
+	else if (dc_lsize == 64)
+		r4k_blast_dcache_user_page = blast_dcache64_user_page;
+}
+
+#endif
+
+static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
+
+static void r4k_blast_dcache_page_indexed_setup(void)
+{
+	unsigned long dc_lsize = cpu_dcache_line_size();
+
+	if (dc_lsize == 0)
+		r4k_blast_dcache_page_indexed = (void *)cache_noop;
+	else if (dc_lsize == 16)
+		r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
+	else if (dc_lsize == 32)
+		r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
+	else if (dc_lsize == 64)
+		r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed;
+	else if (dc_lsize == 128)
+		r4k_blast_dcache_page_indexed = blast_dcache128_page_indexed;
+}
+
+void (* r4k_blast_dcache)(void);
+EXPORT_SYMBOL(r4k_blast_dcache);
+
+static void r4k_blast_dcache_setup(void)
+{
+	unsigned long dc_lsize = cpu_dcache_line_size();
+
+	if (dc_lsize == 0)
+		r4k_blast_dcache = (void *)cache_noop;
+	else if (dc_lsize == 16)
+		r4k_blast_dcache = blast_dcache16;
+	else if (dc_lsize == 32)
+		r4k_blast_dcache = blast_dcache32;
+	else if (dc_lsize == 64)
+		r4k_blast_dcache = blast_dcache64;
+	else if (dc_lsize == 128)
+		r4k_blast_dcache = blast_dcache128;
+}
+
+/* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
+#define JUMP_TO_ALIGN(order) \
+	__asm__ __volatile__( \
+		"b\t1f\n\t" \
+		".align\t" #order "\n\t" \
+		"1:\n\t" \
+		)
+#define CACHE32_UNROLL32_ALIGN	JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
+#define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
+
+static inline void blast_r4600_v1_icache32(void)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	blast_icache32();
+	local_irq_restore(flags);
+}
+
+static inline void tx49_blast_icache32(void)
+{
+	unsigned long start = INDEX_BASE;
+	unsigned long end = start + current_cpu_data.icache.waysize;
+	unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
+	unsigned long ws_end = current_cpu_data.icache.ways <<
+			       current_cpu_data.icache.waybit;
+	unsigned long ws, addr;
+
+	CACHE32_UNROLL32_ALIGN2;
+	/* I'm in even chunk.  blast odd chunks */
+	for (ws = 0; ws < ws_end; ws += ws_inc)
+		for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
+			cache32_unroll32(addr|ws, Index_Invalidate_I);
+	CACHE32_UNROLL32_ALIGN;
+	/* I'm in odd chunk.  blast even chunks */
+	for (ws = 0; ws < ws_end; ws += ws_inc)
+		for (addr = start; addr < end; addr += 0x400 * 2)
+			cache32_unroll32(addr|ws, Index_Invalidate_I);
+}
+
+static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	blast_icache32_page_indexed(page);
+	local_irq_restore(flags);
+}
+
+static inline void tx49_blast_icache32_page_indexed(unsigned long page)
+{
+	unsigned long indexmask = current_cpu_data.icache.waysize - 1;
+	unsigned long start = INDEX_BASE + (page & indexmask);
+	unsigned long end = start + PAGE_SIZE;
+	unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
+	unsigned long ws_end = current_cpu_data.icache.ways <<
+			       current_cpu_data.icache.waybit;
+	unsigned long ws, addr;
+
+	CACHE32_UNROLL32_ALIGN2;
+	/* I'm in even chunk.  blast odd chunks */
+	for (ws = 0; ws < ws_end; ws += ws_inc)
+		for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
+			cache32_unroll32(addr|ws, Index_Invalidate_I);
+	CACHE32_UNROLL32_ALIGN;
+	/* I'm in odd chunk.  blast even chunks */
+	for (ws = 0; ws < ws_end; ws += ws_inc)
+		for (addr = start; addr < end; addr += 0x400 * 2)
+			cache32_unroll32(addr|ws, Index_Invalidate_I);
+}
+
+static void (* r4k_blast_icache_page)(unsigned long addr);
+
+static void r4k_blast_icache_page_setup(void)
+{
+	unsigned long ic_lsize = cpu_icache_line_size();
+
+	if (ic_lsize == 0)
+		r4k_blast_icache_page = (void *)cache_noop;
+	else if (ic_lsize == 16)
+		r4k_blast_icache_page = blast_icache16_page;
+	else if (ic_lsize == 32 && current_cpu_type() == CPU_LOONGSON2)
+		r4k_blast_icache_page = loongson2_blast_icache32_page;
+	else if (ic_lsize == 32)
+		r4k_blast_icache_page = blast_icache32_page;
+	else if (ic_lsize == 64)
+		r4k_blast_icache_page = blast_icache64_page;
+	else if (ic_lsize == 128)
+		r4k_blast_icache_page = blast_icache128_page;
+}
+
+#ifndef CONFIG_EVA
+#define r4k_blast_icache_user_page  r4k_blast_icache_page
+#else
+
+static void (*r4k_blast_icache_user_page)(unsigned long addr);
+
+static void r4k_blast_icache_user_page_setup(void)
+{
+	unsigned long ic_lsize = cpu_icache_line_size();
+
+	if (ic_lsize == 0)
+		r4k_blast_icache_user_page = (void *)cache_noop;
+	else if (ic_lsize == 16)
+		r4k_blast_icache_user_page = blast_icache16_user_page;
+	else if (ic_lsize == 32)
+		r4k_blast_icache_user_page = blast_icache32_user_page;
+	else if (ic_lsize == 64)
+		r4k_blast_icache_user_page = blast_icache64_user_page;
+}
+
+#endif
+
+static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
+
+static void r4k_blast_icache_page_indexed_setup(void)
+{
+	unsigned long ic_lsize = cpu_icache_line_size();
+
+	if (ic_lsize == 0)
+		r4k_blast_icache_page_indexed = (void *)cache_noop;
+	else if (ic_lsize == 16)
+		r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
+	else if (ic_lsize == 32) {
+		if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
+			r4k_blast_icache_page_indexed =
+				blast_icache32_r4600_v1_page_indexed;
+		else if (TX49XX_ICACHE_INDEX_INV_WAR)
+			r4k_blast_icache_page_indexed =
+				tx49_blast_icache32_page_indexed;
+		else if (current_cpu_type() == CPU_LOONGSON2)
+			r4k_blast_icache_page_indexed =
+				loongson2_blast_icache32_page_indexed;
+		else
+			r4k_blast_icache_page_indexed =
+				blast_icache32_page_indexed;
+	} else if (ic_lsize == 64)
+		r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
+}
+
+void (* r4k_blast_icache)(void);
+EXPORT_SYMBOL(r4k_blast_icache);
+
+static void r4k_blast_icache_setup(void)
+{
+	unsigned long ic_lsize = cpu_icache_line_size();
+
+	if (ic_lsize == 0)
+		r4k_blast_icache = (void *)cache_noop;
+	else if (ic_lsize == 16)
+		r4k_blast_icache = blast_icache16;
+	else if (ic_lsize == 32) {
+		if (R4600_V1_INDEX_ICACHEOP_WAR && cpu_is_r4600_v1_x())
+			r4k_blast_icache = blast_r4600_v1_icache32;
+		else if (TX49XX_ICACHE_INDEX_INV_WAR)
+			r4k_blast_icache = tx49_blast_icache32;
+		else if (current_cpu_type() == CPU_LOONGSON2)
+			r4k_blast_icache = loongson2_blast_icache32;
+		else
+			r4k_blast_icache = blast_icache32;
+	} else if (ic_lsize == 64)
+		r4k_blast_icache = blast_icache64;
+	else if (ic_lsize == 128)
+		r4k_blast_icache = blast_icache128;
+}
+
+static void (* r4k_blast_scache_page)(unsigned long addr);
+
+static void r4k_blast_scache_page_setup(void)
+{
+	unsigned long sc_lsize = cpu_scache_line_size();
+
+	if (scache_size == 0)
+		r4k_blast_scache_page = (void *)cache_noop;
+	else if (sc_lsize == 16)
+		r4k_blast_scache_page = blast_scache16_page;
+	else if (sc_lsize == 32)
+		r4k_blast_scache_page = blast_scache32_page;
+	else if (sc_lsize == 64)
+		r4k_blast_scache_page = blast_scache64_page;
+	else if (sc_lsize == 128)
+		r4k_blast_scache_page = blast_scache128_page;
+}
+
+static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
+
+static void r4k_blast_scache_page_indexed_setup(void)
+{
+	unsigned long sc_lsize = cpu_scache_line_size();
+
+	if (scache_size == 0)
+		r4k_blast_scache_page_indexed = (void *)cache_noop;
+	else if (sc_lsize == 16)
+		r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
+	else if (sc_lsize == 32)
+		r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
+	else if (sc_lsize == 64)
+		r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
+	else if (sc_lsize == 128)
+		r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
+}
+
+static void (* r4k_blast_scache)(void);
+
+static void r4k_blast_scache_setup(void)
+{
+	unsigned long sc_lsize = cpu_scache_line_size();
+
+	if (scache_size == 0)
+		r4k_blast_scache = (void *)cache_noop;
+	else if (sc_lsize == 16)
+		r4k_blast_scache = blast_scache16;
+	else if (sc_lsize == 32)
+		r4k_blast_scache = blast_scache32;
+	else if (sc_lsize == 64)
+		r4k_blast_scache = blast_scache64;
+	else if (sc_lsize == 128)
+		r4k_blast_scache = blast_scache128;
+}
+
+static void (*r4k_blast_scache_node)(long node);
+
+static void r4k_blast_scache_node_setup(void)
+{
+	unsigned long sc_lsize = cpu_scache_line_size();
+
+	if (current_cpu_type() != CPU_LOONGSON3)
+		r4k_blast_scache_node = (void *)cache_noop;
+	else if (sc_lsize == 16)
+		r4k_blast_scache_node = blast_scache16_node;
+	else if (sc_lsize == 32)
+		r4k_blast_scache_node = blast_scache32_node;
+	else if (sc_lsize == 64)
+		r4k_blast_scache_node = blast_scache64_node;
+	else if (sc_lsize == 128)
+		r4k_blast_scache_node = blast_scache128_node;
+}
+
+static inline void local_r4k___flush_cache_all(void * args)
+{
+	switch (current_cpu_type()) {
+	case CPU_LOONGSON2:
+	case CPU_R4000SC:
+	case CPU_R4000MC:
+	case CPU_R4400SC:
+	case CPU_R4400MC:
+	case CPU_R10000:
+	case CPU_R12000:
+	case CPU_R14000:
+	case CPU_R16000:
+		/*
+		 * These caches are inclusive caches, that is, if something
+		 * is not cached in the S-cache, we know it also won't be
+		 * in one of the primary caches.
+		 */
+		r4k_blast_scache();
+		break;
+
+	case CPU_LOONGSON3:
+		/* Use get_ebase_cpunum() for both NUMA=y/n */
+		r4k_blast_scache_node(get_ebase_cpunum() >> 2);
+		break;
+
+	case CPU_BMIPS5000:
+		r4k_blast_scache();
+		__sync();
+		break;
+
+	default:
+		r4k_blast_dcache();
+		r4k_blast_icache();
+		break;
+	}
+}
+
+static void r4k___flush_cache_all(void)
+{
+	r4k_on_each_cpu(R4K_INDEX, local_r4k___flush_cache_all, NULL);
+}
+
+/**
+ * has_valid_asid() - Determine if an mm already has an ASID.
+ * @mm:		Memory map.
+ * @type:	R4K_HIT or R4K_INDEX, type of cache op.
+ *
+ * Determines whether @mm already has an ASID on any of the CPUs which cache ops
+ * of type @type within an r4k_on_each_cpu() call will affect. If
+ * r4k_on_each_cpu() does an SMP call to a single VPE in each core, then the
+ * scope of the operation is confined to sibling CPUs, otherwise all online CPUs
+ * will need to be checked.
+ *
+ * Must be called in non-preemptive context.
+ *
+ * Returns:	1 if the CPUs affected by @type cache ops have an ASID for @mm.
+ *		0 otherwise.
+ */
+static inline int has_valid_asid(const struct mm_struct *mm, unsigned int type)
+{
+	unsigned int i;
+	const cpumask_t *mask = cpu_present_mask;
+
+	/* cpu_sibling_map[] undeclared when !CONFIG_SMP */
+#ifdef CONFIG_SMP
+	/*
+	 * If r4k_on_each_cpu does SMP calls, it does them to a single VPE in
+	 * each foreign core, so we only need to worry about siblings.
+	 * Otherwise we need to worry about all present CPUs.
+	 */
+	if (r4k_op_needs_ipi(type))
+		mask = &cpu_sibling_map[smp_processor_id()];
+#endif
+	for_each_cpu(i, mask)
+		if (cpu_context(i, mm))
+			return 1;
+	return 0;
+}
+
+static void r4k__flush_cache_vmap(void)
+{
+	r4k_blast_dcache();
+}
+
+static void r4k__flush_cache_vunmap(void)
+{
+	r4k_blast_dcache();
+}
+
+/*
+ * Note: flush_tlb_range() assumes flush_cache_range() sufficiently flushes
+ * whole caches when vma is executable.
+ */
+static inline void local_r4k_flush_cache_range(void * args)
+{
+	struct vm_area_struct *vma = args;
+	int exec = vma->vm_flags & VM_EXEC;
+
+	if (!has_valid_asid(vma->vm_mm, R4K_INDEX))
+		return;
+
+	/*
+	 * If dcache can alias, we must blast it since mapping is changing.
+	 * If executable, we must ensure any dirty lines are written back far
+	 * enough to be visible to icache.
+	 */
+	if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
+		r4k_blast_dcache();
+	/* If executable, blast stale lines from icache */
+	if (exec)
+		r4k_blast_icache();
+}
+
+static void r4k_flush_cache_range(struct vm_area_struct *vma,
+	unsigned long start, unsigned long end)
+{
+	int exec = vma->vm_flags & VM_EXEC;
+
+	if (cpu_has_dc_aliases || exec)
+		r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_range, vma);
+}
+
+static inline void local_r4k_flush_cache_mm(void * args)
+{
+	struct mm_struct *mm = args;
+
+	if (!has_valid_asid(mm, R4K_INDEX))
+		return;
+
+	/*
+	 * Kludge alert.  For obscure reasons R4000SC and R4400SC go nuts if we
+	 * only flush the primary caches but R1x000 behave sane ...
+	 * R4000SC and R4400SC indexed S-cache ops also invalidate primary
+	 * caches, so we can bail out early.
+	 */
+	if (current_cpu_type() == CPU_R4000SC ||
+	    current_cpu_type() == CPU_R4000MC ||
+	    current_cpu_type() == CPU_R4400SC ||
+	    current_cpu_type() == CPU_R4400MC) {
+		r4k_blast_scache();
+		return;
+	}
+
+	r4k_blast_dcache();
+}
+
+static void r4k_flush_cache_mm(struct mm_struct *mm)
+{
+	if (!cpu_has_dc_aliases)
+		return;
+
+	r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_mm, mm);
+}
+
+struct flush_cache_page_args {
+	struct vm_area_struct *vma;
+	unsigned long addr;
+	unsigned long pfn;
+};
+
+static inline void local_r4k_flush_cache_page(void *args)
+{
+	struct flush_cache_page_args *fcp_args = args;
+	struct vm_area_struct *vma = fcp_args->vma;
+	unsigned long addr = fcp_args->addr;
+	struct page *page = pfn_to_page(fcp_args->pfn);
+	int exec = vma->vm_flags & VM_EXEC;
+	struct mm_struct *mm = vma->vm_mm;
+	int map_coherent = 0;
+	pgd_t *pgdp;
+	pud_t *pudp;
+	pmd_t *pmdp;
+	pte_t *ptep;
+	void *vaddr;
+
+	/*
+	 * If owns no valid ASID yet, cannot possibly have gotten
+	 * this page into the cache.
+	 */
+	if (!has_valid_asid(mm, R4K_HIT))
+		return;
+
+	addr &= PAGE_MASK;
+	pgdp = pgd_offset(mm, addr);
+	pudp = pud_offset(pgdp, addr);
+	pmdp = pmd_offset(pudp, addr);
+	ptep = pte_offset(pmdp, addr);
+
+	/*
+	 * If the page isn't marked valid, the page cannot possibly be
+	 * in the cache.
+	 */
+	if (!(pte_present(*ptep)))
+		return;
+
+	if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
+		vaddr = NULL;
+	else {
+		/*
+		 * Use kmap_coherent or kmap_atomic to do flushes for
+		 * another ASID than the current one.
+		 */
+		map_coherent = (cpu_has_dc_aliases &&
+				page_mapcount(page) &&
+				!Page_dcache_dirty(page));
+		if (map_coherent)
+			vaddr = kmap_coherent(page, addr);
+		else
+			vaddr = kmap_atomic(page);
+		addr = (unsigned long)vaddr;
+	}
+
+	if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
+		vaddr ? r4k_blast_dcache_page(addr) :
+			r4k_blast_dcache_user_page(addr);
+		if (exec && !cpu_icache_snoops_remote_store)
+			r4k_blast_scache_page(addr);
+	}
+	if (exec) {
+		if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
+			int cpu = smp_processor_id();
+
+			if (cpu_context(cpu, mm) != 0)
+				drop_mmu_context(mm, cpu);
+		} else
+			vaddr ? r4k_blast_icache_page(addr) :
+				r4k_blast_icache_user_page(addr);
+	}
+
+	if (vaddr) {
+		if (map_coherent)
+			kunmap_coherent();
+		else
+			kunmap_atomic(vaddr);
+	}
+}
+
+static void r4k_flush_cache_page(struct vm_area_struct *vma,
+	unsigned long addr, unsigned long pfn)
+{
+	struct flush_cache_page_args args;
+
+	args.vma = vma;
+	args.addr = addr;
+	args.pfn = pfn;
+
+	r4k_on_each_cpu(R4K_HIT, local_r4k_flush_cache_page, &args);
+}
+
+static inline void local_r4k_flush_data_cache_page(void * addr)
+{
+	r4k_blast_dcache_page((unsigned long) addr);
+}
+
+static void r4k_flush_data_cache_page(unsigned long addr)
+{
+	if (in_atomic())
+		local_r4k_flush_data_cache_page((void *)addr);
+	else
+		r4k_on_each_cpu(R4K_HIT, local_r4k_flush_data_cache_page,
+				(void *) addr);
+}
+
+struct flush_icache_range_args {
+	unsigned long start;
+	unsigned long end;
+	unsigned int type;
+	bool user;
+};
+
+static inline void __local_r4k_flush_icache_range(unsigned long start,
+						  unsigned long end,
+						  unsigned int type,
+						  bool user)
+{
+	if (!cpu_has_ic_fills_f_dc) {
+		if (type == R4K_INDEX ||
+		    (type & R4K_INDEX && end - start >= dcache_size)) {
+			r4k_blast_dcache();
+		} else {
+			R4600_HIT_CACHEOP_WAR_IMPL;
+			if (user)
+				protected_blast_dcache_range(start, end);
+			else
+				blast_dcache_range(start, end);
+		}
+	}
+
+	if (type == R4K_INDEX ||
+	    (type & R4K_INDEX && end - start > icache_size))
+		r4k_blast_icache();
+	else {
+		switch (boot_cpu_type()) {
+		case CPU_LOONGSON2:
+			protected_loongson2_blast_icache_range(start, end);
+			break;
+
+		default:
+			if (user)
+				protected_blast_icache_range(start, end);
+			else
+				blast_icache_range(start, end);
+			break;
+		}
+	}
+}
+
+static inline void local_r4k_flush_icache_range(unsigned long start,
+						unsigned long end)
+{
+	__local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, false);
+}
+
+static inline void local_r4k_flush_icache_user_range(unsigned long start,
+						     unsigned long end)
+{
+	__local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, true);
+}
+
+static inline void local_r4k_flush_icache_range_ipi(void *args)
+{
+	struct flush_icache_range_args *fir_args = args;
+	unsigned long start = fir_args->start;
+	unsigned long end = fir_args->end;
+	unsigned int type = fir_args->type;
+	bool user = fir_args->user;
+
+	__local_r4k_flush_icache_range(start, end, type, user);
+}
+
+static void __r4k_flush_icache_range(unsigned long start, unsigned long end,
+				     bool user)
+{
+	struct flush_icache_range_args args;
+	unsigned long size, cache_size;
+
+	args.start = start;
+	args.end = end;
+	args.type = R4K_HIT | R4K_INDEX;
+	args.user = user;
+
+	/*
+	 * Indexed cache ops require an SMP call.
+	 * Consider if that can or should be avoided.
+	 */
+	preempt_disable();
+	if (r4k_op_needs_ipi(R4K_INDEX) && !r4k_op_needs_ipi(R4K_HIT)) {
+		/*
+		 * If address-based cache ops don't require an SMP call, then
+		 * use them exclusively for small flushes.
+		 */
+		size = end - start;
+		cache_size = icache_size;
+		if (!cpu_has_ic_fills_f_dc) {
+			size *= 2;
+			cache_size += dcache_size;
+		}
+		if (size <= cache_size)
+			args.type &= ~R4K_INDEX;
+	}
+	r4k_on_each_cpu(args.type, local_r4k_flush_icache_range_ipi, &args);
+	preempt_enable();
+	instruction_hazard();
+}
+
+static void r4k_flush_icache_range(unsigned long start, unsigned long end)
+{
+	return __r4k_flush_icache_range(start, end, false);
+}
+
+static void r4k_flush_icache_user_range(unsigned long start, unsigned long end)
+{
+	return __r4k_flush_icache_range(start, end, true);
+}
+
+#ifdef CONFIG_DMA_NONCOHERENT
+
+static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
+{
+	/* Catch bad driver code */
+	if (WARN_ON(size == 0))
+		return;
+
+	preempt_disable();
+	if (cpu_has_inclusive_pcaches) {
+		if (size >= scache_size) {
+			if (current_cpu_type() != CPU_LOONGSON3)
+				r4k_blast_scache();
+			else
+				r4k_blast_scache_node(pa_to_nid(addr));
+		} else {
+			blast_scache_range(addr, addr + size);
+		}
+		preempt_enable();
+		__sync();
+		return;
+	}
+
+	/*
+	 * Either no secondary cache or the available caches don't have the
+	 * subset property so we have to flush the primary caches
+	 * explicitly.
+	 * If we would need IPI to perform an INDEX-type operation, then
+	 * we have to use the HIT-type alternative as IPI cannot be used
+	 * here due to interrupts possibly being disabled.
+	 */
+	if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) {
+		r4k_blast_dcache();
+	} else {
+		R4600_HIT_CACHEOP_WAR_IMPL;
+		blast_dcache_range(addr, addr + size);
+	}
+	preempt_enable();
+
+	bc_wback_inv(addr, size);
+	__sync();
+}
+
+static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
+{
+	/* Catch bad driver code */
+	if (WARN_ON(size == 0))
+		return;
+
+	preempt_disable();
+	if (cpu_has_inclusive_pcaches) {
+		if (size >= scache_size) {
+			if (current_cpu_type() != CPU_LOONGSON3)
+				r4k_blast_scache();
+			else
+				r4k_blast_scache_node(pa_to_nid(addr));
+		} else {
+			/*
+			 * There is no clearly documented alignment requirement
+			 * for the cache instruction on MIPS processors and
+			 * some processors, among them the RM5200 and RM7000
+			 * QED processors will throw an address error for cache
+			 * hit ops with insufficient alignment.	 Solved by
+			 * aligning the address to cache line size.
+			 */
+			blast_inv_scache_range(addr, addr + size);
+		}
+		preempt_enable();
+		__sync();
+		return;
+	}
+
+	if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) {
+		r4k_blast_dcache();
+	} else {
+		R4600_HIT_CACHEOP_WAR_IMPL;
+		blast_inv_dcache_range(addr, addr + size);
+	}
+	preempt_enable();
+
+	bc_inv(addr, size);
+	__sync();
+}
+#endif /* CONFIG_DMA_NONCOHERENT */
+
+struct flush_cache_sigtramp_args {
+	struct mm_struct *mm;
+	struct page *page;
+	unsigned long addr;
+};
+
+/*
+ * While we're protected against bad userland addresses we don't care
+ * very much about what happens in that case.  Usually a segmentation
+ * fault will dump the process later on anyway ...
+ */
+static void local_r4k_flush_cache_sigtramp(void *args)
+{
+	struct flush_cache_sigtramp_args *fcs_args = args;
+	unsigned long addr = fcs_args->addr;
+	struct page *page = fcs_args->page;
+	struct mm_struct *mm = fcs_args->mm;
+	int map_coherent = 0;
+	void *vaddr;
+
+	unsigned long ic_lsize = cpu_icache_line_size();
+	unsigned long dc_lsize = cpu_dcache_line_size();
+	unsigned long sc_lsize = cpu_scache_line_size();
+
+	/*
+	 * If owns no valid ASID yet, cannot possibly have gotten
+	 * this page into the cache.
+	 */
+	if (!has_valid_asid(mm, R4K_HIT))
+		return;
+
+	if (mm == current->active_mm) {
+		vaddr = NULL;
+	} else {
+		/*
+		 * Use kmap_coherent or kmap_atomic to do flushes for
+		 * another ASID than the current one.
+		 */
+		map_coherent = (cpu_has_dc_aliases &&
+				page_mapcount(page) &&
+				!Page_dcache_dirty(page));
+		if (map_coherent)
+			vaddr = kmap_coherent(page, addr);
+		else
+			vaddr = kmap_atomic(page);
+		addr = (unsigned long)vaddr + (addr & ~PAGE_MASK);
+	}
+
+	R4600_HIT_CACHEOP_WAR_IMPL;
+	if (!cpu_has_ic_fills_f_dc) {
+		if (dc_lsize)
+			vaddr ? flush_dcache_line(addr & ~(dc_lsize - 1))
+			      : protected_writeback_dcache_line(
+							addr & ~(dc_lsize - 1));
+		if (!cpu_icache_snoops_remote_store && scache_size)
+			vaddr ? flush_scache_line(addr & ~(sc_lsize - 1))
+			      : protected_writeback_scache_line(
+							addr & ~(sc_lsize - 1));
+	}
+	if (ic_lsize)
+		vaddr ? flush_icache_line(addr & ~(ic_lsize - 1))
+		      : protected_flush_icache_line(addr & ~(ic_lsize - 1));
+
+	if (vaddr) {
+		if (map_coherent)
+			kunmap_coherent();
+		else
+			kunmap_atomic(vaddr);
+	}
+
+	if (MIPS4K_ICACHE_REFILL_WAR) {
+		__asm__ __volatile__ (
+			".set push\n\t"
+			".set noat\n\t"
+			".set "MIPS_ISA_LEVEL"\n\t"
+#ifdef CONFIG_32BIT
+			"la	$at,1f\n\t"
+#endif
+#ifdef CONFIG_64BIT
+			"dla	$at,1f\n\t"
+#endif
+			"cache	%0,($at)\n\t"
+			"nop; nop; nop\n"
+			"1:\n\t"
+			".set pop"
+			:
+			: "i" (Hit_Invalidate_I));
+	}
+	if (MIPS_CACHE_SYNC_WAR)
+		__asm__ __volatile__ ("sync");
+}
+
+static void r4k_flush_cache_sigtramp(unsigned long addr)
+{
+	struct flush_cache_sigtramp_args args;
+	int npages;
+
+	down_read(&current->mm->mmap_sem);
+
+	npages = get_user_pages_fast(addr, 1, 0, &args.page);
+	if (npages < 1)
+		goto out;
+
+	args.mm = current->mm;
+	args.addr = addr;
+
+	r4k_on_each_cpu(R4K_HIT, local_r4k_flush_cache_sigtramp, &args);
+
+	put_page(args.page);
+out:
+	up_read(&current->mm->mmap_sem);
+}
+
+static void r4k_flush_icache_all(void)
+{
+	if (cpu_has_vtag_icache)
+		r4k_blast_icache();
+}
+
+struct flush_kernel_vmap_range_args {
+	unsigned long	vaddr;
+	int		size;
+};
+
+static inline void local_r4k_flush_kernel_vmap_range_index(void *args)
+{
+	/*
+	 * Aliases only affect the primary caches so don't bother with
+	 * S-caches or T-caches.
+	 */
+	r4k_blast_dcache();
+}
+
+static inline void local_r4k_flush_kernel_vmap_range(void *args)
+{
+	struct flush_kernel_vmap_range_args *vmra = args;
+	unsigned long vaddr = vmra->vaddr;
+	int size = vmra->size;
+
+	/*
+	 * Aliases only affect the primary caches so don't bother with
+	 * S-caches or T-caches.
+	 */
+	R4600_HIT_CACHEOP_WAR_IMPL;
+	blast_dcache_range(vaddr, vaddr + size);
+}
+
+static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size)
+{
+	struct flush_kernel_vmap_range_args args;
+
+	args.vaddr = (unsigned long) vaddr;
+	args.size = size;
+
+	if (size >= dcache_size)
+		r4k_on_each_cpu(R4K_INDEX,
+				local_r4k_flush_kernel_vmap_range_index, NULL);
+	else
+		r4k_on_each_cpu(R4K_HIT, local_r4k_flush_kernel_vmap_range,
+				&args);
+}
+
+static inline void rm7k_erratum31(void)
+{
+	const unsigned long ic_lsize = 32;
+	unsigned long addr;
+
+	/* RM7000 erratum #31. The icache is screwed at startup. */
+	write_c0_taglo(0);
+	write_c0_taghi(0);
+
+	for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
+		__asm__ __volatile__ (
+			".set push\n\t"
+			".set noreorder\n\t"
+			".set mips3\n\t"
+			"cache\t%1, 0(%0)\n\t"
+			"cache\t%1, 0x1000(%0)\n\t"
+			"cache\t%1, 0x2000(%0)\n\t"
+			"cache\t%1, 0x3000(%0)\n\t"
+			"cache\t%2, 0(%0)\n\t"
+			"cache\t%2, 0x1000(%0)\n\t"
+			"cache\t%2, 0x2000(%0)\n\t"
+			"cache\t%2, 0x3000(%0)\n\t"
+			"cache\t%1, 0(%0)\n\t"
+			"cache\t%1, 0x1000(%0)\n\t"
+			"cache\t%1, 0x2000(%0)\n\t"
+			"cache\t%1, 0x3000(%0)\n\t"
+			".set pop\n"
+			:
+			: "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill));
+	}
+}
+
+static inline int alias_74k_erratum(struct cpuinfo_mips *c)
+{
+	unsigned int imp = c->processor_id & PRID_IMP_MASK;
+	unsigned int rev = c->processor_id & PRID_REV_MASK;
+	int present = 0;
+
+	/*
+	 * Early versions of the 74K do not update the cache tags on a
+	 * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
+	 * aliases.  In this case it is better to treat the cache as always
+	 * having aliases.  Also disable the synonym tag update feature
+	 * where available.  In this case no opportunistic tag update will
+	 * happen where a load causes a virtual address miss but a physical
+	 * address hit during a D-cache look-up.
+	 */
+	switch (imp) {
+	case PRID_IMP_74K:
+		if (rev <= PRID_REV_ENCODE_332(2, 4, 0))
+			present = 1;
+		if (rev == PRID_REV_ENCODE_332(2, 4, 0))
+			write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
+		break;
+	case PRID_IMP_1074K:
+		if (rev <= PRID_REV_ENCODE_332(1, 1, 0)) {
+			present = 1;
+			write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
+		}
+		break;
+	default:
+		BUG();
+	}
+
+	return present;
+}
+
+static void b5k_instruction_hazard(void)
+{
+	__sync();
+	__sync();
+	__asm__ __volatile__(
+	"       nop; nop; nop; nop; nop; nop; nop; nop\n"
+	"       nop; nop; nop; nop; nop; nop; nop; nop\n"
+	"       nop; nop; nop; nop; nop; nop; nop; nop\n"
+	"       nop; nop; nop; nop; nop; nop; nop; nop\n"
+	: : : "memory");
+}
+
+static char *way_string[] = { NULL, "direct mapped", "2-way",
+	"3-way", "4-way", "5-way", "6-way", "7-way", "8-way",
+	"9-way", "10-way", "11-way", "12-way",
+	"13-way", "14-way", "15-way", "16-way",
+};
+
+static void probe_pcache(void)
+{
+	struct cpuinfo_mips *c = &current_cpu_data;
+	unsigned int config = read_c0_config();
+	unsigned int prid = read_c0_prid();
+	int has_74k_erratum = 0;
+	unsigned long config1;
+	unsigned int lsize;
+
+	switch (current_cpu_type()) {
+	case CPU_R4600:			/* QED style two way caches? */
+	case CPU_R4700:
+	case CPU_R5000:
+	case CPU_NEVADA:
+		icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
+		c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
+		c->icache.ways = 2;
+		c->icache.waybit = __ffs(icache_size/2);
+
+		dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
+		c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
+		c->dcache.ways = 2;
+		c->dcache.waybit= __ffs(dcache_size/2);
+
+		c->options |= MIPS_CPU_CACHE_CDEX_P;
+		break;
+
+	case CPU_R5432:
+	case CPU_R5500:
+		icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
+		c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
+		c->icache.ways = 2;
+		c->icache.waybit= 0;
+
+		dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
+		c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
+		c->dcache.ways = 2;
+		c->dcache.waybit = 0;
+
+		c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
+		break;
+
+	case CPU_TX49XX:
+		icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
+		c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
+		c->icache.ways = 4;
+		c->icache.waybit= 0;
+
+		dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
+		c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
+		c->dcache.ways = 4;
+		c->dcache.waybit = 0;
+
+		c->options |= MIPS_CPU_CACHE_CDEX_P;
+		c->options |= MIPS_CPU_PREFETCH;
+		break;
+
+	case CPU_R4000PC:
+	case CPU_R4000SC:
+	case CPU_R4000MC:
+	case CPU_R4400PC:
+	case CPU_R4400SC:
+	case CPU_R4400MC:
+	case CPU_R4300:
+		icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
+		c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
+		c->icache.ways = 1;
+		c->icache.waybit = 0;	/* doesn't matter */
+
+		dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
+		c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
+		c->dcache.ways = 1;
+		c->dcache.waybit = 0;	/* does not matter */
+
+		c->options |= MIPS_CPU_CACHE_CDEX_P;
+		break;
+
+	case CPU_R10000:
+	case CPU_R12000:
+	case CPU_R14000:
+	case CPU_R16000:
+		icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
+		c->icache.linesz = 64;
+		c->icache.ways = 2;
+		c->icache.waybit = 0;
+
+		dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
+		c->dcache.linesz = 32;
+		c->dcache.ways = 2;
+		c->dcache.waybit = 0;
+
+		c->options |= MIPS_CPU_PREFETCH;
+		break;
+
+	case CPU_VR4133:
+		write_c0_config(config & ~VR41_CONF_P4K);
+	case CPU_VR4131:
+		/* Workaround for cache instruction bug of VR4131 */
+		if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
+		    c->processor_id == 0x0c82U) {
+			config |= 0x00400000U;
+			if (c->processor_id == 0x0c80U)
+				config |= VR41_CONF_BP;
+			write_c0_config(config);
+		} else
+			c->options |= MIPS_CPU_CACHE_CDEX_P;
+
+		icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
+		c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
+		c->icache.ways = 2;
+		c->icache.waybit = __ffs(icache_size/2);
+
+		dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
+		c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
+		c->dcache.ways = 2;
+		c->dcache.waybit = __ffs(dcache_size/2);
+		break;
+
+	case CPU_VR41XX:
+	case CPU_VR4111:
+	case CPU_VR4121:
+	case CPU_VR4122:
+	case CPU_VR4181:
+	case CPU_VR4181A:
+		icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
+		c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
+		c->icache.ways = 1;
+		c->icache.waybit = 0;	/* doesn't matter */
+
+		dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
+		c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
+		c->dcache.ways = 1;
+		c->dcache.waybit = 0;	/* does not matter */
+
+		c->options |= MIPS_CPU_CACHE_CDEX_P;
+		break;
+
+	case CPU_RM7000:
+		rm7k_erratum31();
+
+		icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
+		c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
+		c->icache.ways = 4;
+		c->icache.waybit = __ffs(icache_size / c->icache.ways);
+
+		dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
+		c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
+		c->dcache.ways = 4;
+		c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
+
+		c->options |= MIPS_CPU_CACHE_CDEX_P;
+		c->options |= MIPS_CPU_PREFETCH;
+		break;
+
+	case CPU_LOONGSON2:
+		icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
+		c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
+		if (prid & 0x3)
+			c->icache.ways = 4;
+		else
+			c->icache.ways = 2;
+		c->icache.waybit = 0;
+
+		dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
+		c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
+		if (prid & 0x3)
+			c->dcache.ways = 4;
+		else
+			c->dcache.ways = 2;
+		c->dcache.waybit = 0;
+		break;
+
+	case CPU_LOONGSON3:
+		config1 = read_c0_config1();
+		lsize = (config1 >> 19) & 7;
+		if (lsize)
+			c->icache.linesz = 2 << lsize;
+		else
+			c->icache.linesz = 0;
+		c->icache.sets = 64 << ((config1 >> 22) & 7);
+		c->icache.ways = 1 + ((config1 >> 16) & 7);
+		icache_size = c->icache.sets *
+					  c->icache.ways *
+					  c->icache.linesz;
+		c->icache.waybit = 0;
+
+		lsize = (config1 >> 10) & 7;
+		if (lsize)
+			c->dcache.linesz = 2 << lsize;
+		else
+			c->dcache.linesz = 0;
+		c->dcache.sets = 64 << ((config1 >> 13) & 7);
+		c->dcache.ways = 1 + ((config1 >> 7) & 7);
+		dcache_size = c->dcache.sets *
+					  c->dcache.ways *
+					  c->dcache.linesz;
+		c->dcache.waybit = 0;
+		if ((prid & PRID_REV_MASK) >= PRID_REV_LOONGSON3A_R2)
+			c->options |= MIPS_CPU_PREFETCH;
+		break;
+
+	case CPU_CAVIUM_OCTEON3:
+		/* For now lie about the number of ways. */
+		c->icache.linesz = 128;
+		c->icache.sets = 16;
+		c->icache.ways = 8;
+		c->icache.flags |= MIPS_CACHE_VTAG;
+		icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
+
+		c->dcache.linesz = 128;
+		c->dcache.ways = 8;
+		c->dcache.sets = 8;
+		dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
+		c->options |= MIPS_CPU_PREFETCH;
+		break;
+
+	default:
+		if (!(config & MIPS_CONF_M))
+			panic("Don't know how to probe P-caches on this cpu.");
+
+		/*
+		 * So we seem to be a MIPS32 or MIPS64 CPU
+		 * So let's probe the I-cache ...
+		 */
+		config1 = read_c0_config1();
+
+		lsize = (config1 >> 19) & 7;
+
+		/* IL == 7 is reserved */
+		if (lsize == 7)
+			panic("Invalid icache line size");
+
+		c->icache.linesz = lsize ? 2 << lsize : 0;
+
+		c->icache.sets = 32 << (((config1 >> 22) + 1) & 7);
+		c->icache.ways = 1 + ((config1 >> 16) & 7);
+
+		icache_size = c->icache.sets *
+			      c->icache.ways *
+			      c->icache.linesz;
+		c->icache.waybit = __ffs(icache_size/c->icache.ways);
+
+		if (config & MIPS_CONF_VI)
+			c->icache.flags |= MIPS_CACHE_VTAG;
+
+		/*
+		 * Now probe the MIPS32 / MIPS64 data cache.
+		 */
+		c->dcache.flags = 0;
+
+		lsize = (config1 >> 10) & 7;
+
+		/* DL == 7 is reserved */
+		if (lsize == 7)
+			panic("Invalid dcache line size");
+
+		c->dcache.linesz = lsize ? 2 << lsize : 0;
+
+		c->dcache.sets = 32 << (((config1 >> 13) + 1) & 7);
+		c->dcache.ways = 1 + ((config1 >> 7) & 7);
+
+		dcache_size = c->dcache.sets *
+			      c->dcache.ways *
+			      c->dcache.linesz;
+		c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
+
+		c->options |= MIPS_CPU_PREFETCH;
+		break;
+	}
+
+	/*
+	 * Processor configuration sanity check for the R4000SC erratum
+	 * #5.	With page sizes larger than 32kB there is no possibility
+	 * to get a VCE exception anymore so we don't care about this
+	 * misconfiguration.  The case is rather theoretical anyway;
+	 * presumably no vendor is shipping his hardware in the "bad"
+	 * configuration.
+	 */
+	if ((prid & PRID_IMP_MASK) == PRID_IMP_R4000 &&
+	    (prid & PRID_REV_MASK) < PRID_REV_R4400 &&
+	    !(config & CONF_SC) && c->icache.linesz != 16 &&
+	    PAGE_SIZE <= 0x8000)
+		panic("Improper R4000SC processor configuration detected");
+
+	/* compute a couple of other cache variables */
+	c->icache.waysize = icache_size / c->icache.ways;
+	c->dcache.waysize = dcache_size / c->dcache.ways;
+
+	c->icache.sets = c->icache.linesz ?
+		icache_size / (c->icache.linesz * c->icache.ways) : 0;
+	c->dcache.sets = c->dcache.linesz ?
+		dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
+
+	/*
+	 * R1x000 P-caches are odd in a positive way.  They're 32kB 2-way
+	 * virtually indexed so normally would suffer from aliases.  So
+	 * normally they'd suffer from aliases but magic in the hardware deals
+	 * with that for us so we don't need to take care ourselves.
+	 */
+	switch (current_cpu_type()) {
+	case CPU_20KC:
+	case CPU_25KF:
+	case CPU_I6400:
+	case CPU_I6500:
+	case CPU_SB1:
+	case CPU_SB1A:
+	case CPU_XLR:
+		c->dcache.flags |= MIPS_CACHE_PINDEX;
+		break;
+
+	case CPU_R10000:
+	case CPU_R12000:
+	case CPU_R14000:
+	case CPU_R16000:
+		break;
+
+	case CPU_74K:
+	case CPU_1074K:
+		has_74k_erratum = alias_74k_erratum(c);
+		/* Fall through. */
+	case CPU_M14KC:
+	case CPU_M14KEC:
+	case CPU_24K:
+	case CPU_34K:
+	case CPU_1004K:
+	case CPU_INTERAPTIV:
+	case CPU_P5600:
+	case CPU_PROAPTIV:
+	case CPU_M5150:
+	case CPU_QEMU_GENERIC:
+	case CPU_P6600:
+	case CPU_M6250:
+		if (!(read_c0_config7() & MIPS_CONF7_IAR) &&
+		    (c->icache.waysize > PAGE_SIZE))
+			c->icache.flags |= MIPS_CACHE_ALIASES;
+		if (!has_74k_erratum && (read_c0_config7() & MIPS_CONF7_AR)) {
+			/*
+			 * Effectively physically indexed dcache,
+			 * thus no virtual aliases.
+			*/
+			c->dcache.flags |= MIPS_CACHE_PINDEX;
+			break;
+		}
+	default:
+		if (has_74k_erratum || c->dcache.waysize > PAGE_SIZE)
+			c->dcache.flags |= MIPS_CACHE_ALIASES;
+	}
+
+	/* Physically indexed caches don't suffer from virtual aliasing */
+	if (c->dcache.flags & MIPS_CACHE_PINDEX)
+		c->dcache.flags &= ~MIPS_CACHE_ALIASES;
+
+	/*
+	 * In systems with CM the icache fills from L2 or closer caches, and
+	 * thus sees remote stores without needing to write them back any
+	 * further than that.
+	 */
+	if (mips_cm_present())
+		c->icache.flags |= MIPS_IC_SNOOPS_REMOTE;
+
+	switch (current_cpu_type()) {
+	case CPU_20KC:
+		/*
+		 * Some older 20Kc chips doesn't have the 'VI' bit in
+		 * the config register.
+		 */
+		c->icache.flags |= MIPS_CACHE_VTAG;
+		break;
+
+	case CPU_ALCHEMY:
+	case CPU_I6400:
+	case CPU_I6500:
+		c->icache.flags |= MIPS_CACHE_IC_F_DC;
+		break;
+
+	case CPU_BMIPS5000:
+		c->icache.flags |= MIPS_CACHE_IC_F_DC;
+		/* Cache aliases are handled in hardware; allow HIGHMEM */
+		c->dcache.flags &= ~MIPS_CACHE_ALIASES;
+		break;
+
+	case CPU_LOONGSON2:
+		/*
+		 * LOONGSON2 has 4 way icache, but when using indexed cache op,
+		 * one op will act on all 4 ways
+		 */
+		c->icache.ways = 1;
+	}
+
+	printk("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
+	       icache_size >> 10,
+	       c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
+	       way_string[c->icache.ways], c->icache.linesz);
+
+	printk("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
+	       dcache_size >> 10, way_string[c->dcache.ways],
+	       (c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
+	       (c->dcache.flags & MIPS_CACHE_ALIASES) ?
+			"cache aliases" : "no aliases",
+	       c->dcache.linesz);
+}
+
+static void probe_vcache(void)
+{
+	struct cpuinfo_mips *c = &current_cpu_data;
+	unsigned int config2, lsize;
+
+	if (current_cpu_type() != CPU_LOONGSON3)
+		return;
+
+	config2 = read_c0_config2();
+	if ((lsize = ((config2 >> 20) & 15)))
+		c->vcache.linesz = 2 << lsize;
+	else
+		c->vcache.linesz = lsize;
+
+	c->vcache.sets = 64 << ((config2 >> 24) & 15);
+	c->vcache.ways = 1 + ((config2 >> 16) & 15);
+
+	vcache_size = c->vcache.sets * c->vcache.ways * c->vcache.linesz;
+
+	c->vcache.waybit = 0;
+	c->vcache.waysize = vcache_size / c->vcache.ways;
+
+	pr_info("Unified victim cache %ldkB %s, linesize %d bytes.\n",
+		vcache_size >> 10, way_string[c->vcache.ways], c->vcache.linesz);
+}
+
+/*
+ * If you even _breathe_ on this function, look at the gcc output and make sure
+ * it does not pop things on and off the stack for the cache sizing loop that
+ * executes in KSEG1 space or else you will crash and burn badly.  You have
+ * been warned.
+ */
+static int probe_scache(void)
+{
+	unsigned long flags, addr, begin, end, pow2;
+	unsigned int config = read_c0_config();
+	struct cpuinfo_mips *c = &current_cpu_data;
+
+	if (config & CONF_SC)
+		return 0;
+
+	begin = (unsigned long) &_stext;
+	begin &= ~((4 * 1024 * 1024) - 1);
+	end = begin + (4 * 1024 * 1024);
+
+	/*
+	 * This is such a bitch, you'd think they would make it easy to do
+	 * this.  Away you daemons of stupidity!
+	 */
+	local_irq_save(flags);
+
+	/* Fill each size-multiple cache line with a valid tag. */
+	pow2 = (64 * 1024);
+	for (addr = begin; addr < end; addr = (begin + pow2)) {
+		unsigned long *p = (unsigned long *) addr;
+		__asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
+		pow2 <<= 1;
+	}
+
+	/* Load first line with zero (therefore invalid) tag. */
+	write_c0_taglo(0);
+	write_c0_taghi(0);
+	__asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
+	cache_op(Index_Store_Tag_I, begin);
+	cache_op(Index_Store_Tag_D, begin);
+	cache_op(Index_Store_Tag_SD, begin);
+
+	/* Now search for the wrap around point. */
+	pow2 = (128 * 1024);
+	for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
+		cache_op(Index_Load_Tag_SD, addr);
+		__asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
+		if (!read_c0_taglo())
+			break;
+		pow2 <<= 1;
+	}
+	local_irq_restore(flags);
+	addr -= begin;
+
+	scache_size = addr;
+	c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
+	c->scache.ways = 1;
+	c->scache.waybit = 0;		/* does not matter */
+
+	return 1;
+}
+
+static void loongson2_sc_init(void)
+{
+	struct cpuinfo_mips *c = &current_cpu_data;
+
+	scache_size = 512*1024;
+	c->scache.linesz = 32;
+	c->scache.ways = 4;
+	c->scache.waybit = 0;
+	c->scache.waysize = scache_size / (c->scache.ways);
+	c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
+	pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
+	       scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
+
+	c->options |= MIPS_CPU_INCLUSIVE_CACHES;
+}
+
+static void __init loongson3_sc_init(void)
+{
+	struct cpuinfo_mips *c = &current_cpu_data;
+	unsigned int config2, lsize;
+
+	config2 = read_c0_config2();
+	lsize = (config2 >> 4) & 15;
+	if (lsize)
+		c->scache.linesz = 2 << lsize;
+	else
+		c->scache.linesz = 0;
+	c->scache.sets = 64 << ((config2 >> 8) & 15);
+	c->scache.ways = 1 + (config2 & 15);
+
+	scache_size = c->scache.sets *
+				  c->scache.ways *
+				  c->scache.linesz;
+	/* Loongson-3 has 4 cores, 1MB scache for each. scaches are shared */
+	scache_size *= 4;
+	c->scache.waybit = 0;
+	c->scache.waysize = scache_size / c->scache.ways;
+	pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
+	       scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
+	if (scache_size)
+		c->options |= MIPS_CPU_INCLUSIVE_CACHES;
+	return;
+}
+
+extern int r5k_sc_init(void);
+extern int rm7k_sc_init(void);
+extern int mips_sc_init(void);
+
+static void setup_scache(void)
+{
+	struct cpuinfo_mips *c = &current_cpu_data;
+	unsigned int config = read_c0_config();
+	int sc_present = 0;
+
+	/*
+	 * Do the probing thing on R4000SC and R4400SC processors.  Other
+	 * processors don't have a S-cache that would be relevant to the
+	 * Linux memory management.
+	 */
+	switch (current_cpu_type()) {
+	case CPU_R4000SC:
+	case CPU_R4000MC:
+	case CPU_R4400SC:
+	case CPU_R4400MC:
+		sc_present = run_uncached(probe_scache);
+		if (sc_present)
+			c->options |= MIPS_CPU_CACHE_CDEX_S;
+		break;
+
+	case CPU_R10000:
+	case CPU_R12000:
+	case CPU_R14000:
+	case CPU_R16000:
+		scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
+		c->scache.linesz = 64 << ((config >> 13) & 1);
+		c->scache.ways = 2;
+		c->scache.waybit= 0;
+		sc_present = 1;
+		break;
+
+	case CPU_R5000:
+	case CPU_NEVADA:
+#ifdef CONFIG_R5000_CPU_SCACHE
+		r5k_sc_init();
+#endif
+		return;
+
+	case CPU_RM7000:
+#ifdef CONFIG_RM7000_CPU_SCACHE
+		rm7k_sc_init();
+#endif
+		return;
+
+	case CPU_LOONGSON2:
+		loongson2_sc_init();
+		return;
+
+	case CPU_LOONGSON3:
+		loongson3_sc_init();
+		return;
+
+	case CPU_CAVIUM_OCTEON3:
+	case CPU_XLP:
+		/* don't need to worry about L2, fully coherent */
+		return;
+
+	default:
+		if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M32R2 |
+				    MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R1 |
+				    MIPS_CPU_ISA_M64R2 | MIPS_CPU_ISA_M64R6)) {
+#ifdef CONFIG_MIPS_CPU_SCACHE
+			if (mips_sc_init ()) {
+				scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
+				printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
+				       scache_size >> 10,
+				       way_string[c->scache.ways], c->scache.linesz);
+
+				if (current_cpu_type() == CPU_BMIPS5000)
+					c->options |= MIPS_CPU_INCLUSIVE_CACHES;
+			}
+
+#else
+			if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
+				panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
+#endif
+			return;
+		}
+		sc_present = 0;
+	}
+
+	if (!sc_present)
+		return;
+
+	/* compute a couple of other cache variables */
+	c->scache.waysize = scache_size / c->scache.ways;
+
+	c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
+
+	printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
+	       scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
+
+	c->options |= MIPS_CPU_INCLUSIVE_CACHES;
+}
+
+void au1x00_fixup_config_od(void)
+{
+	/*
+	 * c0_config.od (bit 19) was write only (and read as 0)
+	 * on the early revisions of Alchemy SOCs.  It disables the bus
+	 * transaction overlapping and needs to be set to fix various errata.
+	 */
+	switch (read_c0_prid()) {
+	case 0x00030100: /* Au1000 DA */
+	case 0x00030201: /* Au1000 HA */
+	case 0x00030202: /* Au1000 HB */
+	case 0x01030200: /* Au1500 AB */
+	/*
+	 * Au1100 errata actually keeps silence about this bit, so we set it
+	 * just in case for those revisions that require it to be set according
+	 * to the (now gone) cpu table.
+	 */
+	case 0x02030200: /* Au1100 AB */
+	case 0x02030201: /* Au1100 BA */
+	case 0x02030202: /* Au1100 BC */
+		set_c0_config(1 << 19);
+		break;
+	}
+}
+
+/* CP0 hazard avoidance. */
+#define NXP_BARRIER()							\
+	 __asm__ __volatile__(						\
+	".set noreorder\n\t"						\
+	"nop; nop; nop; nop; nop; nop;\n\t"				\
+	".set reorder\n\t")
+
+static void nxp_pr4450_fixup_config(void)
+{
+	unsigned long config0;
+
+	config0 = read_c0_config();
+
+	/* clear all three cache coherency fields */
+	config0 &= ~(0x7 | (7 << 25) | (7 << 28));
+	config0 |= (((_page_cachable_default >> _CACHE_SHIFT) <<  0) |
+		    ((_page_cachable_default >> _CACHE_SHIFT) << 25) |
+		    ((_page_cachable_default >> _CACHE_SHIFT) << 28));
+	write_c0_config(config0);
+	NXP_BARRIER();
+}
+
+static int cca = -1;
+
+static int __init cca_setup(char *str)
+{
+	get_option(&str, &cca);
+
+	return 0;
+}
+
+early_param("cca", cca_setup);
+
+static void coherency_setup(void)
+{
+	if (cca < 0 || cca > 7)
+		cca = read_c0_config() & CONF_CM_CMASK;
+	_page_cachable_default = cca << _CACHE_SHIFT;
+
+	pr_debug("Using cache attribute %d\n", cca);
+	change_c0_config(CONF_CM_CMASK, cca);
+
+	/*
+	 * c0_status.cu=0 specifies that updates by the sc instruction use
+	 * the coherency mode specified by the TLB; 1 means cachable
+	 * coherent update on write will be used.  Not all processors have
+	 * this bit and; some wire it to zero, others like Toshiba had the
+	 * silly idea of putting something else there ...
+	 */
+	switch (current_cpu_type()) {
+	case CPU_R4000PC:
+	case CPU_R4000SC:
+	case CPU_R4000MC:
+	case CPU_R4400PC:
+	case CPU_R4400SC:
+	case CPU_R4400MC:
+		clear_c0_config(CONF_CU);
+		break;
+	/*
+	 * We need to catch the early Alchemy SOCs with
+	 * the write-only co_config.od bit and set it back to one on:
+	 * Au1000 rev DA, HA, HB;  Au1100 AB, BA, BC, Au1500 AB
+	 */
+	case CPU_ALCHEMY:
+		au1x00_fixup_config_od();
+		break;
+
+	case PRID_IMP_PR4450:
+		nxp_pr4450_fixup_config();
+		break;
+	}
+}
+
+static void r4k_cache_error_setup(void)
+{
+	extern char __weak except_vec2_generic;
+	extern char __weak except_vec2_sb1;
+
+	switch (current_cpu_type()) {
+	case CPU_SB1:
+	case CPU_SB1A:
+		set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
+		break;
+
+	default:
+		set_uncached_handler(0x100, &except_vec2_generic, 0x80);
+		break;
+	}
+}
+
+void r4k_cache_init(void)
+{
+	extern void build_clear_page(void);
+	extern void build_copy_page(void);
+	struct cpuinfo_mips *c = &current_cpu_data;
+
+	probe_pcache();
+	probe_vcache();
+	setup_scache();
+
+	r4k_blast_dcache_page_setup();
+	r4k_blast_dcache_page_indexed_setup();
+	r4k_blast_dcache_setup();
+	r4k_blast_icache_page_setup();
+	r4k_blast_icache_page_indexed_setup();
+	r4k_blast_icache_setup();
+	r4k_blast_scache_page_setup();
+	r4k_blast_scache_page_indexed_setup();
+	r4k_blast_scache_setup();
+	r4k_blast_scache_node_setup();
+#ifdef CONFIG_EVA
+	r4k_blast_dcache_user_page_setup();
+	r4k_blast_icache_user_page_setup();
+#endif
+
+	/*
+	 * Some MIPS32 and MIPS64 processors have physically indexed caches.
+	 * This code supports virtually indexed processors and will be
+	 * unnecessarily inefficient on physically indexed processors.
+	 */
+	if (c->dcache.linesz && cpu_has_dc_aliases)
+		shm_align_mask = max_t( unsigned long,
+					c->dcache.sets * c->dcache.linesz - 1,
+					PAGE_SIZE - 1);
+	else
+		shm_align_mask = PAGE_SIZE-1;
+
+	__flush_cache_vmap	= r4k__flush_cache_vmap;
+	__flush_cache_vunmap	= r4k__flush_cache_vunmap;
+
+	flush_cache_all		= cache_noop;
+	__flush_cache_all	= r4k___flush_cache_all;
+	flush_cache_mm		= r4k_flush_cache_mm;
+	flush_cache_page	= r4k_flush_cache_page;
+	flush_cache_range	= r4k_flush_cache_range;
+
+	__flush_kernel_vmap_range = r4k_flush_kernel_vmap_range;
+
+	flush_cache_sigtramp	= r4k_flush_cache_sigtramp;
+	flush_icache_all	= r4k_flush_icache_all;
+	local_flush_data_cache_page	= local_r4k_flush_data_cache_page;
+	flush_data_cache_page	= r4k_flush_data_cache_page;
+	flush_icache_range	= r4k_flush_icache_range;
+	local_flush_icache_range	= local_r4k_flush_icache_range;
+	__flush_icache_user_range	= r4k_flush_icache_user_range;
+	__local_flush_icache_user_range	= local_r4k_flush_icache_user_range;
+
+#if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
+# if defined(CONFIG_DMA_PERDEV_COHERENT)
+	if (0) {
+# else
+	if ((coherentio == IO_COHERENCE_ENABLED) ||
+	    ((coherentio == IO_COHERENCE_DEFAULT) && hw_coherentio)) {
+# endif
+		_dma_cache_wback_inv	= (void *)cache_noop;
+		_dma_cache_wback	= (void *)cache_noop;
+		_dma_cache_inv		= (void *)cache_noop;
+	} else {
+		_dma_cache_wback_inv	= r4k_dma_cache_wback_inv;
+		_dma_cache_wback	= r4k_dma_cache_wback_inv;
+		_dma_cache_inv		= r4k_dma_cache_inv;
+	}
+#endif
+
+	build_clear_page();
+	build_copy_page();
+
+	/*
+	 * We want to run CMP kernels on core with and without coherent
+	 * caches. Therefore, do not use CONFIG_MIPS_CMP to decide whether
+	 * or not to flush caches.
+	 */
+	local_r4k___flush_cache_all(NULL);
+
+	coherency_setup();
+	board_cache_error_setup = r4k_cache_error_setup;
+
+	/*
+	 * Per-CPU overrides
+	 */
+	switch (current_cpu_type()) {
+	case CPU_BMIPS4350:
+	case CPU_BMIPS4380:
+		/* No IPI is needed because all CPUs share the same D$ */
+		flush_data_cache_page = r4k_blast_dcache_page;
+		break;
+	case CPU_BMIPS5000:
+		/* We lose our superpowers if L2 is disabled */
+		if (c->scache.flags & MIPS_CACHE_NOT_PRESENT)
+			break;
+
+		/* I$ fills from D$ just by emptying the write buffers */
+		flush_cache_page = (void *)b5k_instruction_hazard;
+		flush_cache_range = (void *)b5k_instruction_hazard;
+		flush_cache_sigtramp = (void *)b5k_instruction_hazard;
+		local_flush_data_cache_page = (void *)b5k_instruction_hazard;
+		flush_data_cache_page = (void *)b5k_instruction_hazard;
+		flush_icache_range = (void *)b5k_instruction_hazard;
+		local_flush_icache_range = (void *)b5k_instruction_hazard;
+
+
+		/* Optimization: an L2 flush implicitly flushes the L1 */
+		current_cpu_data.options |= MIPS_CPU_INCLUSIVE_CACHES;
+		break;
+	case CPU_LOONGSON3:
+		/* Loongson-3 maintains cache coherency by hardware */
+		__flush_cache_all	= cache_noop;
+		__flush_cache_vmap	= cache_noop;
+		__flush_cache_vunmap	= cache_noop;
+		__flush_kernel_vmap_range = (void *)cache_noop;
+		flush_cache_mm		= (void *)cache_noop;
+		flush_cache_page	= (void *)cache_noop;
+		flush_cache_range	= (void *)cache_noop;
+		flush_cache_sigtramp	= (void *)cache_noop;
+		flush_icache_all	= (void *)cache_noop;
+		flush_data_cache_page	= (void *)cache_noop;
+		local_flush_data_cache_page	= (void *)cache_noop;
+		break;
+	}
+}
+
+static int r4k_cache_pm_notifier(struct notifier_block *self, unsigned long cmd,
+			       void *v)
+{
+	switch (cmd) {
+	case CPU_PM_ENTER_FAILED:
+	case CPU_PM_EXIT:
+		coherency_setup();
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block r4k_cache_pm_notifier_block = {
+	.notifier_call = r4k_cache_pm_notifier,
+};
+
+int __init r4k_cache_init_pm(void)
+{
+	return cpu_pm_register_notifier(&r4k_cache_pm_notifier_block);
+}
+arch_initcall(r4k_cache_init_pm);