1 files changed, 171 insertions, 0 deletions

diff --git a/arch/sparc/include/asm/pgtsun4.h b/arch/sparc/include/asm/pgtsun4.h
new file mode 100644
index 000000000000..5a0d661fb82e
--- /dev/null
+++ b/arch/sparc/include/asm/pgtsun4.h
@@ -0,0 +1,171 @@
+/*
+ * pgtsun4.h:  Sun4 specific pgtable.h defines and code.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+#ifndef _SPARC_PGTSUN4C_H
+#define _SPARC_PGTSUN4C_H
+
+#include <asm/contregs.h>
+
+/* PMD_SHIFT determines the size of the area a second-level page table can map */
+#define SUN4C_PMD_SHIFT       23
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+#define SUN4C_PGDIR_SHIFT       23
+#define SUN4C_PGDIR_SIZE        (1UL << SUN4C_PGDIR_SHIFT)
+#define SUN4C_PGDIR_MASK        (~(SUN4C_PGDIR_SIZE-1))
+#define SUN4C_PGDIR_ALIGN(addr) (((addr)+SUN4C_PGDIR_SIZE-1)&SUN4C_PGDIR_MASK)
+
+/* To represent how the sun4c mmu really lays things out. */
+#define SUN4C_REAL_PGDIR_SHIFT       18
+#define SUN4C_REAL_PGDIR_SIZE        (1UL << SUN4C_REAL_PGDIR_SHIFT)
+#define SUN4C_REAL_PGDIR_MASK        (~(SUN4C_REAL_PGDIR_SIZE-1))
+#define SUN4C_REAL_PGDIR_ALIGN(addr) (((addr)+SUN4C_REAL_PGDIR_SIZE-1)&SUN4C_REAL_PGDIR_MASK)
+
+/* 19 bit PFN on sun4 */
+#define SUN4C_PFN_MASK 0x7ffff
+ 
+/* Don't increase these unless the structures in sun4c.c are fixed */
+#define SUN4C_MAX_SEGMAPS 256
+#define SUN4C_MAX_CONTEXTS 16
+
+/*
+ * To be efficient, and not have to worry about allocating such
+ * a huge pgd, we make the kernel sun4c tables each hold 1024
+ * entries and the pgd similarly just like the i386 tables.
+ */
+#define SUN4C_PTRS_PER_PTE    1024
+#define SUN4C_PTRS_PER_PMD    1
+#define SUN4C_PTRS_PER_PGD    1024
+
+/*
+ * Sparc SUN4C pte fields.
+ */
+#define _SUN4C_PAGE_VALID        0x80000000
+#define _SUN4C_PAGE_SILENT_READ  0x80000000   /* synonym */
+#define _SUN4C_PAGE_DIRTY        0x40000000
+#define _SUN4C_PAGE_SILENT_WRITE 0x40000000   /* synonym */
+#define _SUN4C_PAGE_PRIV         0x20000000   /* privileged page */
+#define _SUN4C_PAGE_NOCACHE      0x10000000   /* non-cacheable page */
+#define _SUN4C_PAGE_PRESENT      0x08000000   /* implemented in software */
+#define _SUN4C_PAGE_IO           0x04000000   /* I/O page */
+#define _SUN4C_PAGE_FILE         0x02000000   /* implemented in software */
+#define _SUN4C_PAGE_READ         0x00800000   /* implemented in software */
+#define _SUN4C_PAGE_WRITE        0x00400000   /* implemented in software */
+#define _SUN4C_PAGE_ACCESSED     0x00200000   /* implemented in software */
+#define _SUN4C_PAGE_MODIFIED     0x00100000   /* implemented in software */
+
+#define _SUN4C_READABLE         (_SUN4C_PAGE_READ|_SUN4C_PAGE_SILENT_READ|\
+                                 _SUN4C_PAGE_ACCESSED)
+#define _SUN4C_WRITEABLE        (_SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE|\
+                                 _SUN4C_PAGE_MODIFIED)
+
+#define _SUN4C_PAGE_CHG_MASK    (0xffff|_SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_MODIFIED)
+
+#define SUN4C_PAGE_NONE         __pgprot(_SUN4C_PAGE_PRESENT)
+#define SUN4C_PAGE_SHARED       __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE|\
+                                         _SUN4C_PAGE_WRITE)
+#define SUN4C_PAGE_COPY         __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
+#define SUN4C_PAGE_READONLY     __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
+#define SUN4C_PAGE_KERNEL       __pgprot(_SUN4C_READABLE|_SUN4C_WRITEABLE|\
+                                         _SUN4C_PAGE_DIRTY|_SUN4C_PAGE_PRIV)
+
+/* SUN4C swap entry encoding
+ *
+ * We use 5 bits for the type and 19 for the offset.  This gives us
+ * 32 swapfiles of 4GB each.  Encoding looks like:
+ *
+ * RRRRRRRRooooooooooooooooooottttt
+ * fedcba9876543210fedcba9876543210
+ *
+ * The top 8 bits are reserved for protection and status bits, especially
+ * FILE and PRESENT.
+ */
+#define SUN4C_SWP_TYPE_MASK     0x1f
+#define SUN4C_SWP_OFF_MASK      0x7ffff
+#define SUN4C_SWP_OFF_SHIFT     5
+
+#ifndef __ASSEMBLY__
+
+static inline unsigned long sun4c_get_synchronous_error(void)
+{
+        unsigned long sync_err;
+
+        __asm__ __volatile__("lda [%1] %2, %0\n\t" :
+                             "=r" (sync_err) :
+                             "r" (AC_SYNC_ERR), "i" (ASI_CONTROL));
+        return sync_err;
+}
+
+static inline unsigned long sun4c_get_synchronous_address(void)
+{
+        unsigned long sync_addr;
+
+        __asm__ __volatile__("lda [%1] %2, %0\n\t" :
+                             "=r" (sync_addr) :
+                             "r" (AC_SYNC_VA), "i" (ASI_CONTROL));
+        return sync_addr;
+}
+
+/* SUN4 pte, segmap, and context manipulation */
+static inline unsigned long sun4c_get_segmap(unsigned long addr)
+{
+  register unsigned long entry;
+
+  __asm__ __volatile__("\n\tlduha [%1] %2, %0\n\t" : 
+                       "=r" (entry) :
+                       "r" (addr), "i" (ASI_SEGMAP));
+  return entry;
+}
+
+static inline void sun4c_put_segmap(unsigned long addr, unsigned long entry)
+{
+  __asm__ __volatile__("\n\tstha %1, [%0] %2; nop; nop; nop;\n\t" : :
+                       "r" (addr), "r" (entry),
+                       "i" (ASI_SEGMAP)
+                       : "memory");
+}
+
+static inline unsigned long sun4c_get_pte(unsigned long addr)
+{
+  register unsigned long entry;
+
+  __asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" : 
+                       "=r" (entry) :
+                       "r" (addr), "i" (ASI_PTE));
+  return entry;
+}
+
+static inline void sun4c_put_pte(unsigned long addr, unsigned long entry)
+{
+  __asm__ __volatile__("\n\tsta %1, [%0] %2; nop; nop; nop;\n\t" : :
+                       "r" (addr), 
+                       "r" ((entry & ~(_SUN4C_PAGE_PRESENT))), "i" (ASI_PTE)
+                       : "memory");
+}
+
+static inline int sun4c_get_context(void)
+{
+  register int ctx;
+
+  __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
+                       "=r" (ctx) :
+                       "r" (AC_CONTEXT), "i" (ASI_CONTROL));
+
+  return ctx;
+}
+
+static inline int sun4c_set_context(int ctx)
+{
+  __asm__ __volatile__("\n\tstba %0, [%1] %2; nop; nop; nop;\n\t" : :
+                       "r" (ctx), "r" (AC_CONTEXT), "i" (ASI_CONTROL)
+                       : "memory");
+
+  return ctx;
+}
+
+#endif /* !(__ASSEMBLY__) */
+
+#endif /* !(_SPARC_PGTSUN4_H) */