1 files changed, 134 insertions, 0 deletions

diff --git a/arch/sparc/include/asm/vac-ops.h b/arch/sparc/include/asm/vac-ops.h
new file mode 100644
index 000000000000..d10527611f11
--- /dev/null
+++ b/arch/sparc/include/asm/vac-ops.h
@@ -0,0 +1,134 @@
+#ifndef _SPARC_VAC_OPS_H
+#define _SPARC_VAC_OPS_H
+
+/* vac-ops.h: Inline assembly routines to do operations on the Sparc
+ *            VAC (virtual address cache) for the sun4c.
+ *
+ * Copyright (C) 1994, David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <asm/sysen.h>
+#include <asm/contregs.h>
+#include <asm/asi.h>
+
+/* The SUN4C models have a virtually addressed write-through
+ * cache.
+ *
+ * The cache tags are directly accessible through an ASI and
+ * each have the form:
+ *
+ * ------------------------------------------------------------
+ * | MBZ | CONTEXT | WRITE | PRIV | VALID | MBZ | TagID | MBZ |
+ * ------------------------------------------------------------
+ *  31 25  24   22     21     20     19    18 16  15   2  1  0
+ *
+ * MBZ: These bits are either unused and/or reserved and should
+ *      be written as zeroes.
+ *
+ * CONTEXT: Records the context to which this cache line belongs.
+ *
+ * WRITE: A copy of the writable bit from the mmu pte access bits.
+ *
+ * PRIV: A copy of the privileged bit from the pte access bits.
+ *
+ * VALID: If set, this line is valid, else invalid.
+ *
+ * TagID: Fourteen bits of tag ID.
+ *
+ * Every virtual address is seen by the cache like this:
+ *
+ * ----------------------------------------
+ * |  RESV  | TagID | LINE | BYTE-in-LINE |
+ * ----------------------------------------
+ *  31    30 29   16 15   4 3            0
+ *
+ * RESV: Unused/reserved.
+ *
+ * TagID: Used to match the Tag-ID in that vac tags.
+ *
+ * LINE: Which line within the cache
+ *
+ * BYTE-in-LINE: Which byte within the cache line.
+ */
+
+/* Sun4c VAC Tags */
+#define S4CVACTAG_CID      0x01c00000
+#define S4CVACTAG_W        0x00200000
+#define S4CVACTAG_P        0x00100000
+#define S4CVACTAG_V        0x00080000
+#define S4CVACTAG_TID      0x0000fffc
+
+/* Sun4c VAC Virtual Address */
+/* These aren't used, why bother? (Anton) */
+#if 0
+#define S4CVACVA_TID       0x3fff0000
+#define S4CVACVA_LINE      0x0000fff0
+#define S4CVACVA_BIL       0x0000000f
+#endif
+
+/* The indexing of cache lines creates a problem.  Because the line
+ * field of a virtual address extends past the page offset within
+ * the virtual address it is possible to have what are called
+ * 'bad aliases' which will create inconsistencies.  So we must make
+ * sure that within a context that if a physical page is mapped
+ * more than once, that 'extra' line bits are the same.  If this is
+ * not the case, and thus is a 'bad alias' we must turn off the
+ * cacheable bit in the pte's of all such pages.
+ */
+
+#ifdef CONFIG_SUN4
+#define S4CVAC_BADBITS     0x0001e000
+#else
+#define S4CVAC_BADBITS    0x0000f000
+#endif
+
+/* The following is true if vaddr1 and vaddr2 would cause
+ * a 'bad alias'.
+ */
+#define S4CVAC_BADALIAS(vaddr1, vaddr2) \
+        ((((unsigned long) (vaddr1)) ^ ((unsigned long) (vaddr2))) & \
+         (S4CVAC_BADBITS))
+
+/* The following structure describes the characteristics of a sun4c
+ * VAC as probed from the prom during boot time.
+ */
+struct sun4c_vac_props {
+        unsigned int num_bytes;     /* Size of the cache */
+        unsigned int num_lines;     /* Number of cache lines */
+        unsigned int do_hwflushes;  /* Hardware flushing available? */
+        enum { VAC_NONE, VAC_WRITE_THROUGH,
+            VAC_WRITE_BACK } type;  /* What type of VAC? */
+        unsigned int linesize;      /* Size of each line in bytes */
+        unsigned int log2lsize;     /* log2(linesize) */
+        unsigned int on;            /* VAC is enabled */
+};
+
+extern struct sun4c_vac_props sun4c_vacinfo;
+
+/* sun4c_enable_vac() enables the sun4c virtual address cache. */
+static inline void sun4c_enable_vac(void)
+{
+        __asm__ __volatile__("lduba [%0] %1, %%g1\n\t"
+                             "or    %%g1, %2, %%g1\n\t"
+                             "stba  %%g1, [%0] %1\n\t"
+                             : /* no outputs */
+                             : "r" ((unsigned int) AC_SENABLE),
+                             "i" (ASI_CONTROL), "i" (SENABLE_CACHE)
+                             : "g1", "memory");
+        sun4c_vacinfo.on = 1;
+}
+
+/* sun4c_disable_vac() disables the virtual address cache. */
+static inline void sun4c_disable_vac(void)
+{
+        __asm__ __volatile__("lduba [%0] %1, %%g1\n\t"
+                             "andn  %%g1, %2, %%g1\n\t"
+                             "stba  %%g1, [%0] %1\n\t"
+                             : /* no outputs */
+                             : "r" ((unsigned int) AC_SENABLE),
+                             "i" (ASI_CONTROL), "i" (SENABLE_CACHE)
+                             : "g1", "memory");
+        sun4c_vacinfo.on = 0;
+}
+
+#endif /* !(_SPARC_VAC_OPS_H) */