[S390] Cleanup in page table related code.

Changed and simplified some page table related #defines and code.

Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 58 insertions, 66 deletions

diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
index 24312387fa24..1a07028d575e 100644
--- a/include/asm-s390/pgtable.h
+++ b/include/asm-s390/pgtable.h
@@ -89,19 +89,6 @@ extern char empty_zero_page[PAGE_SIZE];
 # define PTRS_PER_PGD    2048
 #endif /* __s390x__ */
 
-/*
- * pgd entries used up by user/kernel:
- */
-#ifndef __s390x__
-# define USER_PTRS_PER_PGD  512
-# define USER_PGD_PTRS      512
-# define KERNEL_PGD_PTRS    512
-#else /* __s390x__ */
-# define USER_PTRS_PER_PGD  2048
-# define USER_PGD_PTRS      2048
-# define KERNEL_PGD_PTRS    2048
-#endif /* __s390x__ */
-
 #define FIRST_USER_ADDRESS  0
 
 #define pte_ERROR(e) \
@@ -216,12 +203,14 @@ extern char empty_zero_page[PAGE_SIZE];
 #define _PAGE_RO        0x200          /* HW read-only                     */
 #define _PAGE_INVALID   0x400          /* HW invalid                       */
 
-/* Mask and four different kinds of invalid pages. */
-#define _PAGE_INVALID_MASK      0x601
-#define _PAGE_INVALID_EMPTY     0x400
-#define _PAGE_INVALID_NONE      0x401
-#define _PAGE_INVALID_SWAP      0x600
-#define _PAGE_INVALID_FILE      0x601
+/* Mask and six different types of pages. */
+#define _PAGE_TYPE_MASK         0x601
+#define _PAGE_TYPE_EMPTY        0x400
+#define _PAGE_TYPE_NONE         0x401
+#define _PAGE_TYPE_SWAP         0x600
+#define _PAGE_TYPE_FILE         0x601
+#define _PAGE_TYPE_RO           0x200
+#define _PAGE_TYPE_RW           0x000
 
 #ifndef __s390x__
 
@@ -280,15 +269,14 @@ extern char empty_zero_page[PAGE_SIZE];
 #endif /* __s390x__ */
 
 /*
- * No mapping available
+ * Page protection definitions.
  */
-#define PAGE_NONE_SHARED  __pgprot(_PAGE_INVALID_NONE)
-#define PAGE_NONE_PRIVATE __pgprot(_PAGE_INVALID_NONE)
-#define PAGE_RO_SHARED    __pgprot(_PAGE_RO)
-#define PAGE_RO_PRIVATE   __pgprot(_PAGE_RO)
-#define PAGE_COPY         __pgprot(_PAGE_RO)
-#define PAGE_SHARED       __pgprot(0)
-#define PAGE_KERNEL       __pgprot(0)
+#define PAGE_NONE       __pgprot(_PAGE_TYPE_NONE)
+#define PAGE_RO         __pgprot(_PAGE_TYPE_RO)
+#define PAGE_RW         __pgprot(_PAGE_TYPE_RW)
+
+#define PAGE_KERNEL     PAGE_RW
+#define PAGE_COPY       PAGE_RO
 
 /*
  * The S390 can't do page protection for execute, and considers that the
@@ -296,23 +284,23 @@ extern char empty_zero_page[PAGE_SIZE];
  * the closest we can get..
  */
          /*xwr*/
-#define __P000  PAGE_NONE_PRIVATE
-#define __P001  PAGE_RO_PRIVATE
-#define __P010  PAGE_COPY
-#define __P011  PAGE_COPY
-#define __P100  PAGE_RO_PRIVATE
-#define __P101  PAGE_RO_PRIVATE
-#define __P110  PAGE_COPY
-#define __P111  PAGE_COPY
-
-#define __S000  PAGE_NONE_SHARED
-#define __S001  PAGE_RO_SHARED
-#define __S010  PAGE_SHARED
-#define __S011  PAGE_SHARED
-#define __S100  PAGE_RO_SHARED
-#define __S101  PAGE_RO_SHARED
-#define __S110  PAGE_SHARED
-#define __S111  PAGE_SHARED
+#define __P000  PAGE_NONE
+#define __P001  PAGE_RO
+#define __P010  PAGE_RO
+#define __P011  PAGE_RO
+#define __P100  PAGE_RO
+#define __P101  PAGE_RO
+#define __P110  PAGE_RO
+#define __P111  PAGE_RO
+
+#define __S000  PAGE_NONE
+#define __S001  PAGE_RO
+#define __S010  PAGE_RW
+#define __S011  PAGE_RW
+#define __S100  PAGE_RO
+#define __S101  PAGE_RO
+#define __S110  PAGE_RW
+#define __S111  PAGE_RW
 
 /*
  * Certain architectures need to do special things when PTEs
@@ -377,18 +365,18 @@ static inline int pmd_bad(pmd_t pmd)
 
 static inline int pte_none(pte_t pte)
 {
-        return (pte_val(pte) & _PAGE_INVALID_MASK) == _PAGE_INVALID_EMPTY;
+        return (pte_val(pte) & _PAGE_TYPE_MASK) == _PAGE_TYPE_EMPTY;
 }
 
 static inline int pte_present(pte_t pte)
 {
         return !(pte_val(pte) & _PAGE_INVALID) ||
-                (pte_val(pte) & _PAGE_INVALID_MASK) == _PAGE_INVALID_NONE;
+                (pte_val(pte) & _PAGE_TYPE_MASK) == _PAGE_TYPE_NONE;
 }
 
 static inline int pte_file(pte_t pte)
 {
-        return (pte_val(pte) & _PAGE_INVALID_MASK) == _PAGE_INVALID_FILE;
+        return (pte_val(pte) & _PAGE_TYPE_MASK) == _PAGE_TYPE_FILE;
 }
 
 #define pte_same(a,b)   (pte_val(a) == pte_val(b))
@@ -461,7 +449,7 @@ static inline void pmd_clear(pmd_t * pmdp)
 
 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
-        pte_val(*ptep) = _PAGE_INVALID_EMPTY;
+        pte_val(*ptep) = _PAGE_TYPE_EMPTY;
 }
 
 /*
@@ -477,7 +465,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 
 static inline pte_t pte_wrprotect(pte_t pte)
 {
-        /* Do not clobber _PAGE_INVALID_NONE pages!  */
+        /* Do not clobber _PAGE_TYPE_NONE pages!  */
         if (!(pte_val(pte) & _PAGE_INVALID))
                 pte_val(pte) |= _PAGE_RO;
         return pte;
@@ -556,26 +544,30 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
         return pte;
 }
 
-static inline pte_t
-ptep_clear_flush(struct vm_area_struct *vma,
-                 unsigned long address, pte_t *ptep)
+static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
 {
-        pte_t pte = *ptep;
+        if (!(pte_val(*ptep) & _PAGE_INVALID)) {
 #ifndef __s390x__
-        if (!(pte_val(pte) & _PAGE_INVALID)) {
                 /* S390 has 1mb segments, we are emulating 4MB segments */
                 pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00);
-                __asm__ __volatile__ ("ipte %2,%3"
-                                      : "=m" (*ptep) : "m" (*ptep),
-                                        "a" (pto), "a" (address) );
+#else
+                /* ipte in zarch mode can do the math */
+                pte_t *pto = ptep;
+#endif
+                asm volatile ("ipte %2,%3"
+                              : "=m" (*ptep) : "m" (*ptep),
+                                "a" (pto), "a" (address) );
         }
-#else /* __s390x__ */
-        if (!(pte_val(pte) & _PAGE_INVALID)) 
-                __asm__ __volatile__ ("ipte %2,%3"
-                                      : "=m" (*ptep) : "m" (*ptep),
-                                        "a" (ptep), "a" (address) );
-#endif /* __s390x__ */
-        pte_val(*ptep) = _PAGE_INVALID_EMPTY;
+        pte_val(*ptep) = _PAGE_TYPE_EMPTY;
+}
+
+static inline pte_t
+ptep_clear_flush(struct vm_area_struct *vma,
+                 unsigned long address, pte_t *ptep)
+{
+        pte_t pte = *ptep;
+
+        __ptep_ipte(address, ptep);
         return pte;
 }
 
@@ -755,7 +747,7 @@ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
 {
         pte_t pte;
         offset &= __SWP_OFFSET_MASK;
-        pte_val(pte) = _PAGE_INVALID_SWAP | ((type & 0x1f) << 2) |
+        pte_val(pte) = _PAGE_TYPE_SWAP | ((type & 0x1f) << 2) |
                 ((offset & 1UL) << 7) | ((offset & ~1UL) << 11);
         return pte;
 }
@@ -778,7 +770,7 @@ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
 
 #define pgoff_to_pte(__off) \
         ((pte_t) { ((((__off) & 0x7f) << 1) + (((__off) >> 7) << 12)) \
-                   | _PAGE_INVALID_FILE })
+                   | _PAGE_TYPE_FILE })
 
 #endif /* !__ASSEMBLY__ */