[PATCH] M68k pte_file

From: Geert Uytterhoeven (geert@linux-m68k.org)
Date: Sun May 11 2003 - 05:30:58 EST

M68k: Add pte_file() for Motorola MMUs (from Roman Zippel):
  - Add support for file file offsets in pte's (recycle unused _PAGE_COW bit)
  - Move swap macros into the mmu specific header
  - Fix swap macros (lowest two bits must be cleared)

--- linux-2.5.x/include/asm-m68k/motorola_pgtable.h 24 Jul 2002 21:46:05 -0000 1.1.1.2
+++ linux-m68k-2.5.x/include/asm-m68k/motorola_pgtable.h 26 Mar 2003 02:18:30 -0000
@@ -14,7 +14,7 @@
 #define _PAGE_SUPER 0x080 /* 68040 supervisor only */
 #define _PAGE_FAKE_SUPER 0x200 /* fake supervisor only on 680[23]0 */
 #define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */
-#define _PAGE_COW 0x800 /* implemented in software */
+#define _PAGE_FILE 0x800 /* pagecache or swap? */
 #define _PAGE_NOCACHE030 0x040 /* 68030 no-cache mode */
 #define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
 #define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
@@ -159,6 +159,7 @@
 extern inline int pte_exec(pte_t pte) { return 1; }
 extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
 extern inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
+static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
 
 extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; }
 extern inline pte_t pte_rdprotect(pte_t pte) { return pte; }
@@ -255,6 +256,25 @@
         }
 }
 
+#define PTE_FILE_MAX_BITS 29
+
+static inline unsigned long pte_to_pgoff(pte_t pte)
+{
+ return ((pte.pte >> 12) << 7) + ((pte.pte >> 2) & 0x1ff);
+}
+
+static inline pte_t pgoff_to_pte(inline unsigned off)
+{
+ pte_t pte = { ((off >> 7) << 12) + ((off & 0x1ff) << 2) + _PAGE_FILE };
+ return pte;
+}
+
+/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
+#define __swp_type(x) (((x).val >> 2) & 0x1ff)
+#define __swp_offset(x) ((x).val >> 12)
+#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 2) | ((offset) << 12) })
+#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
 
 #endif /* !__ASSEMBLY__ */
 #endif /* _MOTOROLA_PGTABLE_H */
--- linux-2.5.x/include/asm-m68k/pgtable.h 16 Sep 2002 18:05:07 -0000 1.1.1.5
+++ linux-m68k-2.5.x/include/asm-m68k/pgtable.h 26 Mar 2003 02:18:31 -0000
@@ -136,25 +136,6 @@
 {
 }
 
-#ifdef CONFIG_SUN3
-/* Macros to (de)construct the fake PTEs representing swap pages. */
-#define __swp_type(x) ((x).val & 0x7F)
-#define __swp_offset(x) (((x).val) >> 7)
-#define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
-#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
-#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
-
-#else
-
-/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
-#define __swp_type(x) (((x).val >> 1) & 0xff)
-#define __swp_offset(x) ((x).val >> 10)
-#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 10) })
-#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
-#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
-
-#endif /* CONFIG_SUN3 */
-
 #endif /* !__ASSEMBLY__ */
 
 #define kern_addr_valid(addr) (1)
--- linux-2.5.x/include/asm-m68k/sun3_pgtable.h 18 Mar 2003 18:31:03 -0000 1.1.1.3
+++ linux-m68k-2.5.x/include/asm-m68k/sun3_pgtable.h 26 Mar 2003 02:18:31 -0000
@@ -204,6 +204,12 @@
 #define pte_unmap(pte) kunmap(pte)
 #define pte_unmap_nested(pte) kunmap(pte)
 
+/* Macros to (de)construct the fake PTEs representing swap pages. */
+#define __swp_type(x) ((x).val & 0x7F)
+#define __swp_offset(x) (((x).val) >> 7)
+#define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
+#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
 
 #endif /* !__ASSEMBLY__ */
 #endif /* !_SUN3_PGTABLE_H */

Gr{oetje,eeting}s,

                                                Geert 

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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