Import of Linux/MIPS 2.1.14

1 files changed, 151 insertions, 0 deletions

diff --git a/include/asm-sparc/pgtsun4c.h b/include/asm-sparc/pgtsun4c.h
new file mode 100644
index 000000000..c54a6079d
--- /dev/null
+++ b/include/asm-sparc/pgtsun4c.h
@@ -0,0 +1,151 @@
+/* $Id: pgtsun4c.h,v 1.27 1996/10/30 06:01:32 davem Exp $
+ * pgtsun4c.h:  Sun4c specific pgtable.h defines and code.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+#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       22
+#define SUN4C_PMD_SIZE        (1UL << SUN4C_PMD_SHIFT)
+#define SUN4C_PMD_MASK        (~(SUN4C_PMD_SIZE-1))
+#define SUN4C_PMD_ALIGN(addr) (((addr)+SUN4C_PMD_SIZE-1)&SUN4C_PMD_MASK)
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+#define SUN4C_PGDIR_SHIFT       22
+#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)
+
+/*
+ * 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
+
+/* On the sun4c the physical ram limit is 128MB.  We set up our I/O
+ * translations at KERNBASE + 128MB for 1MB, then we begin the VMALLOC
+ * area, makes sense.  This works out to the value below.
+ */
+#define SUN4C_VMALLOC_START   (0xfe300000)
+
+/*
+ * Sparc SUN4C pte fields.
+ */
+#define _SUN4C_PAGE_VALID     0x80000000   /* valid page */
+#define _SUN4C_PAGE_WRITE     0x40000000   /* can be written to */
+#define _SUN4C_PAGE_PRIV      0x20000000   /* bit to signify privileged page */
+#define _SUN4C_PAGE_USER      0x00000000   /* User page */
+#define _SUN4C_PAGE_NOCACHE   0x10000000   /* non-cacheable page */
+#define _SUN4C_PAGE_IO        0x04000000   /* I/O page */
+#define _SUN4C_PAGE_REF       0x02000000   /* Page has been accessed/referenced */
+#define _SUN4C_PAGE_DIRTY     0x01000000   /* Page has been modified, is dirty */
+#define _SUN4C_PAGE_PRESENT   0x00400000   /* present (known) page */
+
+#define _SUN4C_PAGE_CHG_MASK  (0xffff | _SUN4C_PAGE_REF | _SUN4C_PAGE_DIRTY)
+
+#define SUN4C_PAGE_NONE     __pgprot(_SUN4C_PAGE_VALID | _SUN4C_PAGE_PRIV | \
+				     _SUN4C_PAGE_REF)
+#define SUN4C_PAGE_SHARED   __pgprot(_SUN4C_PAGE_VALID | _SUN4C_PAGE_WRITE | \
+				     _SUN4C_PAGE_USER | _SUN4C_PAGE_REF)
+#define SUN4C_PAGE_COPY     __pgprot(_SUN4C_PAGE_VALID | _SUN4C_PAGE_USER | \
+				     _SUN4C_PAGE_REF)
+#define SUN4C_PAGE_READONLY __pgprot(_SUN4C_PAGE_VALID | _SUN4C_PAGE_USER | \
+				     _SUN4C_PAGE_REF)
+#define SUN4C_PAGE_KERNEL   __pgprot(_SUN4C_PAGE_VALID | _SUN4C_PAGE_WRITE | \
+				     _SUN4C_PAGE_PRIV | _SUN4C_PAGE_DIRTY | \
+				     _SUN4C_PAGE_REF | _SUN4C_PAGE_NOCACHE)
+
+extern __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;
+}
+
+extern __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;
+}
+
+/* SUN4C pte, segmap, and context manipulation */
+extern __inline__ unsigned long sun4c_get_segmap(unsigned long addr)
+{
+  register unsigned long entry;
+
+  __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" : 
+		       "=r" (entry) :
+		       "r" (addr), "i" (ASI_SEGMAP));
+
+  return entry;
+}
+
+extern __inline__ void sun4c_put_segmap(unsigned long addr, unsigned long entry)
+{
+
+  __asm__ __volatile__("\n\tstba %1, [%0] %2\n\t" : :
+		       "r" (addr), "r" (entry),
+		       "i" (ASI_SEGMAP));
+
+  return;
+}
+
+extern __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;
+}
+
+extern __inline__ void sun4c_put_pte(unsigned long addr, unsigned long entry)
+{
+  __asm__ __volatile__("\n\tsta %1, [%0] %2\n\t" : :
+		       "r" (addr), 
+		       "r" (entry), "i" (ASI_PTE));
+
+  return;
+}
+
+extern __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;
+}
+
+extern __inline__ int sun4c_set_context(int ctx)
+{
+  __asm__ __volatile__("\n\tstba %0, [%1] %2\n\t" : :
+		       "r" (ctx), "r" (AC_CONTEXT), "i" (ASI_CONTROL));
+
+  return ctx;
+}
+
+#endif /* !(_SPARC_PGTSUN4C_H) */