[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6

The attached patches provides part 6 of an architecture implementation for the
Tensilica Xtensa CPU series.

Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 200 insertions, 0 deletions

diff --git a/include/asm-xtensa/tlbflush.h b/include/asm-xtensa/tlbflush.h
new file mode 100644
index 00000000000..23bfe9db45f
--- /dev/null
+++ b/include/asm-xtensa/tlbflush.h
@@ -0,0 +1,200 @@
+/*
+ * include/asm-xtensa/tlbflush.h
+ *
+ * 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) 2001 - 2005 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_TLBFLUSH_H
+#define _XTENSA_TLBFLUSH_H
+
+#define DEBUG_TLB
+
+#ifdef __KERNEL__
+
+#include <asm/processor.h>
+#include <linux/stringify.h>
+
+/* TLB flushing:
+ *
+ *  - flush_tlb_all() flushes all processes TLB entries
+ *  - flush_tlb_mm(mm) flushes the specified mm context TLB entries
+ *  - flush_tlb_page(mm, vmaddr) flushes a single page
+ *  - flush_tlb_range(mm, start, end) flushes a range of pages
+ */
+
+extern void flush_tlb_all(void);
+extern void flush_tlb_mm(struct mm_struct*);
+extern void flush_tlb_page(struct vm_area_struct*,unsigned long);
+extern void flush_tlb_range(struct vm_area_struct*,unsigned long,unsigned long);
+
+#define flush_tlb_kernel_range(start,end) flush_tlb_all()
+
+
+/* This is calld in munmap when we have freed up some page-table pages.
+ * We don't need to do anything here, there's nothing special about our
+ * page-table pages.
+ */
+
+extern inline void flush_tlb_pgtables(struct mm_struct *mm,
+                                      unsigned long start, unsigned long end)
+{
+}
+
+/* TLB operations. */
+
+#define ITLB_WAYS_LOG2      XCHAL_ITLB_WAY_BITS
+#define DTLB_WAYS_LOG2      XCHAL_DTLB_WAY_BITS
+#define ITLB_PROBE_SUCCESS  (1 << ITLB_WAYS_LOG2)
+#define DTLB_PROBE_SUCCESS  (1 << DTLB_WAYS_LOG2)
+
+extern inline unsigned long itlb_probe(unsigned long addr)
+{
+	unsigned long tmp;
+	__asm__ __volatile__("pitlb  %0, %1\n\t" : "=a" (tmp) : "a" (addr));
+	return tmp;
+}
+
+extern inline unsigned long dtlb_probe(unsigned long addr)
+{
+	unsigned long tmp;
+	__asm__ __volatile__("pdtlb  %0, %1\n\t" : "=a" (tmp) : "a" (addr));
+	return tmp;
+}
+
+extern inline void invalidate_itlb_entry (unsigned long probe)
+{
+	__asm__ __volatile__("iitlb  %0; isync\n\t" : : "a" (probe));
+}
+
+extern inline void invalidate_dtlb_entry (unsigned long probe)
+{
+	__asm__ __volatile__("idtlb  %0; dsync\n\t" : : "a" (probe));
+}
+
+/* Use the .._no_isync functions with caution.  Generally, these are
+ * handy for bulk invalidates followed by a single 'isync'.  The
+ * caller must follow up with an 'isync', which can be relatively
+ * expensive on some Xtensa implementations.
+ */
+extern inline void invalidate_itlb_entry_no_isync (unsigned entry)
+{
+	/* Caller must follow up with 'isync'. */
+	__asm__ __volatile__ ("iitlb  %0\n" : : "a" (entry) );
+}
+
+extern inline void invalidate_dtlb_entry_no_isync (unsigned entry)
+{
+	/* Caller must follow up with 'isync'. */
+	__asm__ __volatile__ ("idtlb  %0\n" : : "a" (entry) );
+}
+
+extern inline void set_itlbcfg_register (unsigned long val)
+{
+	__asm__ __volatile__("wsr  %0, "__stringify(ITLBCFG)"\n\t" "isync\n\t"
+			     : : "a" (val));
+}
+
+extern inline void set_dtlbcfg_register (unsigned long val)
+{
+	__asm__ __volatile__("wsr  %0, "__stringify(DTLBCFG)"; dsync\n\t"
+	    		     : : "a" (val));
+}
+
+extern inline void set_ptevaddr_register (unsigned long val)
+{
+	__asm__ __volatile__(" wsr  %0, "__stringify(PTEVADDR)"; isync\n"
+			     : : "a" (val));
+}
+
+extern inline unsigned long read_ptevaddr_register (void)
+{
+	unsigned long tmp;
+	__asm__ __volatile__("rsr  %0, "__stringify(PTEVADDR)"\n\t" : "=a" (tmp));
+	return tmp;
+}
+
+extern inline void write_dtlb_entry (pte_t entry, int way)
+{
+	__asm__ __volatile__("wdtlb  %1, %0; dsync\n\t"
+			     : : "r" (way), "r" (entry) );
+}
+
+extern inline void write_itlb_entry (pte_t entry, int way)
+{
+	__asm__ __volatile__("witlb  %1, %0; isync\n\t"
+	                     : : "r" (way), "r" (entry) );
+}
+
+extern inline void invalidate_page_directory (void)
+{
+	invalidate_dtlb_entry (DTLB_WAY_PGTABLE);
+}
+
+extern inline void invalidate_itlb_mapping (unsigned address)
+{
+	unsigned long tlb_entry;
+	while ((tlb_entry = itlb_probe (address)) & ITLB_PROBE_SUCCESS)
+		invalidate_itlb_entry (tlb_entry);
+}
+
+extern inline void invalidate_dtlb_mapping (unsigned address)
+{
+	unsigned long tlb_entry;
+	while ((tlb_entry = dtlb_probe (address)) & DTLB_PROBE_SUCCESS)
+		invalidate_dtlb_entry (tlb_entry);
+}
+
+#define check_pgt_cache()	do { } while (0)
+
+
+#ifdef DEBUG_TLB
+
+/* DO NOT USE THESE FUNCTIONS.  These instructions aren't part of the Xtensa
+ * ISA and exist only for test purposes..
+ * You may find it helpful for MMU debugging, however.
+ *
+ * 'at' is the unmodified input register
+ * 'as' is the output register, as follows (specific to the Linux config):
+ *
+ *      as[31..12] contain the virtual address
+ *      as[11..08] are meaningless
+ *      as[07..00] contain the asid
+ */
+
+extern inline unsigned long read_dtlb_virtual (int way)
+{
+	unsigned long tmp;
+	__asm__ __volatile__("rdtlb0  %0, %1\n\t" : "=a" (tmp), "+a" (way));
+	return tmp;
+}
+
+extern inline unsigned long read_dtlb_translation (int way)
+{
+	unsigned long tmp;
+	__asm__ __volatile__("rdtlb1  %0, %1\n\t" : "=a" (tmp), "+a" (way));
+	return tmp;
+}
+
+extern inline unsigned long read_itlb_virtual (int way)
+{
+	unsigned long tmp;
+	__asm__ __volatile__("ritlb0  %0, %1\n\t" : "=a" (tmp), "+a" (way));
+	return tmp;
+}
+
+extern inline unsigned long read_itlb_translation (int way)
+{
+	unsigned long tmp;
+	__asm__ __volatile__("ritlb1  %0, %1\n\t" : "=a" (tmp), "+a" (way));
+	return tmp;
+}
+
+#endif	/* DEBUG_TLB */
+
+
+#endif	/* __KERNEL__ */
+#endif	/* _XTENSA_PGALLOC_H */