1 files changed, 138 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/cache.h b/arch/sparc/include/asm/cache.h
new file mode 100644
index 0000000..41f85ae
--- /dev/null
+++ b/arch/sparc/include/asm/cache.h
@@ -0,0 +1,138 @@
+/* cache.h:  Cache specific code for the Sparc.  These include flushing
+ *           and direct tag/data line access.
+ *
+ * Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
+ */
+
+#ifndef _SPARC_CACHE_H
+#define _SPARC_CACHE_H
+
+#define L1_CACHE_SHIFT 5
+#define L1_CACHE_BYTES 32
+#define L1_CACHE_ALIGN(x) ((((x)+(L1_CACHE_BYTES-1))&~(L1_CACHE_BYTES-1)))
+
+#ifdef CONFIG_SPARC32
+#define SMP_CACHE_BYTES_SHIFT 5
+#else
+#define SMP_CACHE_BYTES_SHIFT 6
+#endif
+
+#define SMP_CACHE_BYTES (1 << SMP_CACHE_BYTES_SHIFT)
+
+#define __read_mostly __attribute__((__section__(".data.read_mostly")))
+
+#ifdef CONFIG_SPARC32
+#include <asm/asi.h>
+
+/* Direct access to the instruction cache is provided through and
+ * alternate address space.  The IDC bit must be off in the ICCR on
+ * HyperSparcs for these accesses to work.  The code below does not do
+ * any checking, the caller must do so.  These routines are for
+ * diagnostics only, but could end up being useful.  Use with care.
+ * Also, you are asking for trouble if you execute these in one of the
+ * three instructions following a %asr/%psr access or modification.
+ */
+
+/* First, cache-tag access. */
+static inline unsigned int get_icache_tag(int setnum, int tagnum)
+{
+	unsigned int vaddr, retval;
+
+	vaddr = ((setnum&1) << 12) | ((tagnum&0x7f) << 5);
+	__asm__ __volatile__("lda [%1] %2, %0\n\t" :
+			     "=r" (retval) :
+			     "r" (vaddr), "i" (ASI_M_TXTC_TAG));
+	return retval;
+}
+
+static inline void put_icache_tag(int setnum, int tagnum, unsigned int entry)
+{
+	unsigned int vaddr;
+
+	vaddr = ((setnum&1) << 12) | ((tagnum&0x7f) << 5);
+	__asm__ __volatile__("sta %0, [%1] %2\n\t" : :
+			     "r" (entry), "r" (vaddr), "i" (ASI_M_TXTC_TAG) :
+			     "memory");
+}
+
+/* Second cache-data access.  The data is returned two-32bit quantities
+ * at a time.
+ */
+static inline void get_icache_data(int setnum, int tagnum, int subblock,
+				       unsigned int *data)
+{
+	unsigned int value1, value2, vaddr;
+
+	vaddr = ((setnum&0x1) << 12) | ((tagnum&0x7f) << 5) |
+		((subblock&0x3) << 3);
+	__asm__ __volatile__("ldda [%2] %3, %%g2\n\t"
+			     "or %%g0, %%g2, %0\n\t"
+			     "or %%g0, %%g3, %1\n\t" :
+			     "=r" (value1), "=r" (value2) :
+			     "r" (vaddr), "i" (ASI_M_TXTC_DATA) :
+			     "g2", "g3");
+	data[0] = value1; data[1] = value2;
+}
+
+static inline void put_icache_data(int setnum, int tagnum, int subblock,
+				       unsigned int *data)
+{
+	unsigned int value1, value2, vaddr;
+
+	vaddr = ((setnum&0x1) << 12) | ((tagnum&0x7f) << 5) |
+		((subblock&0x3) << 3);
+	value1 = data[0]; value2 = data[1];
+	__asm__ __volatile__("or %%g0, %0, %%g2\n\t"
+			     "or %%g0, %1, %%g3\n\t"
+			     "stda %%g2, [%2] %3\n\t" : :
+			     "r" (value1), "r" (value2), 
+			     "r" (vaddr), "i" (ASI_M_TXTC_DATA) :
+			     "g2", "g3", "memory" /* no joke */);
+}
+
+/* Different types of flushes with the ICACHE.  Some of the flushes
+ * affect both the ICACHE and the external cache.  Others only clear
+ * the ICACHE entries on the cpu itself.  V8's (most) allow
+ * granularity of flushes on the packet (element in line), whole line,
+ * and entire cache (ie. all lines) level.  The ICACHE only flushes are
+ * ROSS HyperSparc specific and are in ross.h
+ */
+
+/* Flushes which clear out both the on-chip and external caches */
+static inline void flush_ei_page(unsigned int addr)
+{
+	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
+			     "r" (addr), "i" (ASI_M_FLUSH_PAGE) :
+			     "memory");
+}
+
+static inline void flush_ei_seg(unsigned int addr)
+{
+	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
+			     "r" (addr), "i" (ASI_M_FLUSH_SEG) :
+			     "memory");
+}
+
+static inline void flush_ei_region(unsigned int addr)
+{
+	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
+			     "r" (addr), "i" (ASI_M_FLUSH_REGION) :
+			     "memory");
+}
+
+static inline void flush_ei_ctx(unsigned int addr)
+{
+	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
+			     "r" (addr), "i" (ASI_M_FLUSH_CTX) :
+			     "memory");
+}
+
+static inline void flush_ei_user(unsigned int addr)
+{
+	__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
+			     "r" (addr), "i" (ASI_M_FLUSH_USER) :
+			     "memory");
+}
+#endif /* CONFIG_SPARC32 */
+
+#endif /* !(_SPARC_CACHE_H) */