WebSVN – HelenOS – Diff – /branches/arm/kernel/arch/arm32/include/mm/page.h

 /*
- * Copyright (c) 2003-2007 Jakub Jermar
+ * Copyright (c) 2007 Pavel Jancik, Michal Kebrt
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
 #   define KA2PA(x) ((x) - 0x80000000)
 #   define PA2KA(x) ((x) + 0x80000000)
 #endif
 #ifdef KERNEL
-// Using small pages <==> 4kb
-#define PTL0_ENTRIES_ARCH   (2<<12) // 4096
-#define PTL1_ENTRIES_ARCH   0
-#define PTL2_ENTRIES_ARCH   0
-#define PTL3_ENTRIES_ARCH   (2<<8)  // 256
-#define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 20) & 0xfff)
-#define PTL1_INDEX_ARCH(vaddr)  0
-#define PTL2_INDEX_ARCH(vaddr)  0
-#define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x0ff)
-#define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *)(  (((pte_level0_t*)(ptl0))[(i)]).coarse_table_addr << 10 ))
-#define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
-#define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
-#define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ( (uintptr_t)(((pte_level1_t*)(ptl3))[(i)]).frame_base_addr << 12 ))
+// "small" pages (4KB) used
+#define PTL0_ENTRIES_ARCH    (2<<12)    // 4096
+#define PTL1_ENTRIES_ARCH     0
+#define PTL2_ENTRIES_ARCH     0
+#define PTL3_ENTRIES_ARCH    (2<<8)     // 256
+#define PTL0_INDEX_ARCH(vaddr)    (((vaddr) >> 20) & 0xfff)
+#define PTL1_INDEX_ARCH(vaddr)    0
+#define PTL2_INDEX_ARCH(vaddr)    0
+#define PTL3_INDEX_ARCH(vaddr)    (((vaddr) >> 12) & 0x0ff)
+#define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *)( (((pte_level0_t*)(ptl0))[(i)]).coarse_table_addr << 10 ))
+#define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
+#define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
+#define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ((uintptr_t)( (((pte_level1_t*)(ptl3))[(i)]).frame_base_addr << 12 ))
-#define SET_PTL0_ADDRESS_ARCH(ptl0)         ( set_ptl0_addr((pte_level0_t *)(ptl0)) )
+#define SET_PTL0_ADDRESS_ARCH(ptl0)         (set_ptl0_addr((pte_level0_t *)(ptl0)))
 #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_level0_t *)(ptl0))[(i)].coarse_table_addr = (a)>>10)
 #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
 #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
 #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_level1_t *)(ptl3))[(i)].frame_base_addr = (a)>>12)
-#define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i))
+#define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i))
-#define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
+#define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
-#define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
+#define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
 #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i))
 #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i), (x))
 #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
 #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
-#define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i), (x))
+#define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i), (x))
 #define PTE_VALID_ARCH(pte)                 (*((uint32_t *) (pte)) != 0)
 #define PTE_PRESENT_ARCH(pte)               ( ((pte_level0_t *)(pte))->descriptor_type )
+// pte should point into ptl3
-#define PTE_GET_FRAME_ARCH(pte)             ( ((pte_level1_t *)(pte))->frame_base_addr << FRAME_WIDTH)  // pte should point into ptl3
+#define PTE_GET_FRAME_ARCH(pte)             ( ((pte_level1_t *)(pte))->frame_base_addr << FRAME_WIDTH)
+// pte should point into ptl3
-#define PTE_WRITABLE_ARCH(pte)              ( ((pte_level1_t *)(pte))->access_permission_0 == pte_ap_user_rw_kernel_rw )  // pte should point into ptl3
+#define PTE_WRITABLE_ARCH(pte)              ( ((pte_level1_t *)(pte))->access_permission_0 == pte_ap_user_rw_kernel_rw )
-#define PTE_EXECUTABLE_ARCH(pte)               1
+#define PTE_EXECUTABLE_ARCH(pte)            1
 #ifndef __ASM__
-/** Set adress of paging level 0 table
+/** Sets the address of level 0 page table.
- * \param pt pointer to page table to set
+ * \param pt pointer to the page table to set
  */
-static inline void set_ptl0_addr( pte_level0_t* pt){
+static inline void set_ptl0_addr( pte_level0_t* pt)
+{
     asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n"
-    :
+        :
-    : "r"(pt)
+        : "r"(pt)
     );
+}
 //TODO Comment: Page table structure as in other architectures
 static inline int get_pt_level0_flags(pte_level0_t *pt, index_t i)
+{
-  pte_level0_t *p = &pt[i];
+    pte_level0_t *p = &pt[i];
     return (
         ( p->descriptor_type != pte_descriptor_not_preset ) << PAGE_PRESENT_SHIFT |
         ( 1 << PAGE_READ_SHIFT ) |
         ( 1 << PAGE_EXEC_SHIFT ) |
         ( 1 << PAGE_CACHEABLE  )
     );
+}
 static inline int get_pt_level1_flags(pte_level1_t *pt, index_t i)
+{
   pte_level1_t *p = &pt[i];
     return (
     );
+}
 static inline void set_pt_level0_flags(pte_level0_t *pt, index_t i, int flags)
+{
     pte_level0_t *p = &pt[i];
     if ( flags & PAGE_NOT_PRESENT ) {
-      p->descriptor_type = pte_descriptor_not_preset;
+        p->descriptor_type = pte_descriptor_not_preset;
-      p->should_be_zero  = 1;
+        p->should_be_zero  = 1;
-    } else
+    } else {
-    {
-      p->descriptor_type = pte_descriptor_coarse_table;
+        p->descriptor_type = pte_descriptor_coarse_table;
-      p->should_be_zero  = 0;
+        p->should_be_zero  = 0;
+    }
-    return;
+}
-/* We use same acess rights for whole page, so if page is set as not preset then
+/* TODO: rewrite comment: We use same acess rights for whole page, so if page is set as not preset then
  * in acess_rigts_3 set value 1
  */
 static inline void set_pt_level1_flags(pte_level1_t *pt, index_t i, int flags)
+{
     pte_level1_t *p = &pt[i];
     if ( flags & PAGE_NOT_PRESENT ) {
-      p->descriptor_type      = pte_descriptor_not_preset;
+        p->descriptor_type      = pte_descriptor_not_preset;
-      p->access_permission_3  = 1;
+        p->access_permission_3  = 1;
-    } else
+    } else {
-    {
-      p->descriptor_type      = pte_descriptor_coarse_table;
+        p->descriptor_type      = pte_descriptor_coarse_table;
-      p->access_permission_3  = p->access_permission_0;
+        p->access_permission_3  = p->access_permission_0;
     }
-  p->cacheable = p->bufferable = (flags & PAGE_CACHEABLE) != 0;
+    p->cacheable = p->bufferable = (flags & PAGE_CACHEABLE) != 0;
-  // default kernel rw, user none
+    // default kernel rw, user none
+    p->access_permission_0 = p->access_permission_1 =
-  p->access_permission_0 = p->access_permission_1 = p->access_permission_2 = p->access_permission_3 = pte_ap_user_no_kernel_rw;
+        p->access_permission_2 = p->access_permission_3 = pte_ap_user_no_kernel_rw;
-  if ( flags & PAGE_USER )  {
+    if ( flags & PAGE_USER )  {
-      if ( flags & PAGE_READ )
+        if ( flags & PAGE_READ ) {
+            p->access_permission_0 = p->access_permission_1 =
-          p->access_permission_0 = p->access_permission_1 = p->access_permission_2 = p->access_permission_3 = pte_ap_user_ro_kernel_rw;
+                p->access_permission_2 = p->access_permission_3 =
+                pte_ap_user_ro_kernel_rw;
+        }
-      if ( flags & PAGE_WRITE )
+        if ( flags & PAGE_WRITE ) {
+            p->access_permission_0 = p->access_permission_1 =
-          p->access_permission_0 = p->access_permission_1 = p->access_permission_2 = p->access_permission_3 = pte_ap_user_rw_kernel_rw;
+                p->access_permission_2 = p->access_permission_3 =
+                pte_ap_user_rw_kernel_rw;
-  }
+        }
-    return; return;
+    }
+}
 extern void page_arch_init(void);
 #endif /* __ASM__ */

Subversion Repositories HelenOS

(root)/branches/arm/kernel/arch/arm32/include/mm/page.h – Rev 2199 → 2238