[PATCH] m68k page

From: Geert Uytterhoeven (geert@linux-m68k.org)
Date: Sat Jul 26 2003 - 09:51:50 EST


m68k page updates (from Roman Zippel):
  - Set _PAGE_RONLY bit and clear _PAGE_PRESENT to mark PAGE_NONE pte entries
    (this also makes PAGE_NONE fixup unnecessary)
  - Move _PAGE_FILE to a lower, so pte_to_pgoff/pgoff_to_pte becomes simpler

--- linux-2.6.x/arch/m68k/mm/motorola.c Tue Nov 5 10:09:42 2002
+++ linux-m68k-2.6.x/arch/m68k/mm/motorola.c Thu Mar 27 10:58:38 2003
@@ -223,18 +223,6 @@
                 for (i = 0; i < 16; i++)
                         pgprot_val(protection_map[i]) |= _PAGE_CACHE040;
         }
- /* Fix the PAGE_NONE value. */
- if (CPU_IS_040_OR_060) {
- /* On the 680[46]0 we can use the _PAGE_SUPER bit. */
- pgprot_val(protection_map[0]) |= _PAGE_SUPER;
- pgprot_val(protection_map[VM_SHARED]) |= _PAGE_SUPER;
- } else {
- /* Otherwise we must fake it. */
- pgprot_val(protection_map[0]) &= ~_PAGE_PRESENT;
- pgprot_val(protection_map[0]) |= _PAGE_FAKE_SUPER;
- pgprot_val(protection_map[VM_SHARED]) &= ~_PAGE_PRESENT;
- pgprot_val(protection_map[VM_SHARED]) |= _PAGE_FAKE_SUPER;
- }
 
         /*
          * Map the physical memory available into the kernel virtual
--- linux-2.6.x/include/asm-m68k/motorola_pgtable.h Sun Apr 13 13:53:20 2003
+++ linux-m68k-2.6.x/include/asm-m68k/motorola_pgtable.h Thu Mar 27 10:58:42 2003
@@ -12,9 +12,7 @@
 #define _PAGE_ACCESSED 0x008
 #define _PAGE_DIRTY 0x010
 #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_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 */
@@ -29,6 +27,9 @@
 #define _PAGE_TABLE (_PAGE_SHORT)
 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
 
+#define _PAGE_PROTNONE 0x004
+#define _PAGE_FILE 0x008 /* pagecache or swap? */
+
 #ifndef __ASSEMBLY__
 
 /* This is the cache mode to be used for pages containing page descriptors for
@@ -54,7 +55,7 @@
 extern unsigned long mm_cachebits;
 #endif
 
-#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
+#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits)
 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
@@ -62,7 +63,7 @@
 
 /* Alternate definitions that are compile time constants, for
    initializing protection_map. The cachebits are fixed later. */
-#define PAGE_NONE_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
+#define PAGE_NONE_C __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 #define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
 #define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
 #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
@@ -118,7 +119,7 @@
 
 
 #define pte_none(pte) (!pte_val(pte))
-#define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_FAKE_SUPER))
+#define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 #define pte_clear(ptep) ({ pte_val(*(ptep)) = 0; })
 
 #define pte_page(pte) (mem_map + ((unsigned long)(__va(pte_val(pte)) - PAGE_OFFSET) >> PAGE_SHIFT))
@@ -256,23 +257,23 @@
         }
 }
 
-#define PTE_FILE_MAX_BITS 29
+#define PTE_FILE_MAX_BITS 28
 
 static inline unsigned long pte_to_pgoff(pte_t pte)
 {
- return ((pte.pte >> 12) << 7) + ((pte.pte >> 2) & 0x1ff);
+ return pte.pte >> 4;
 }
 
 static inline pte_t pgoff_to_pte(inline unsigned off)
 {
- pte_t pte = { ((off >> 7) << 12) + ((off & 0x1ff) << 2) + _PAGE_FILE };
+ pte_t pte = { (off << 4) + _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_type(x) (((x).val >> 4) & 0xff)
 #define __swp_offset(x) ((x).val >> 12)
-#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 2) | ((offset) << 12) })
+#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
 

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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Thu Jul 31 2003 - 22:00:28 EST