Changes in kernel/arch/arm32/include/mm/page.h [914e063:3b71e84d] in mainline

File:

• kernel/arch/arm32/include/mm/page.h (modified) (2 diffs)

kernel/arch/arm32/include/mm/page.h

@@ -37 +37 @@
 #define KERN_arm32_PAGE_H_
 
-#ifdef MACHINE_beagleboardxm
-#ifndef __ASM__
-#       define KA2PA(x) ((uintptr_t) (x))
-#       define PA2KA(x) ((uintptr_t) (x))
-#else
-#       define KA2PA(x) (x)
-#       define PA2KA(x) (x)
-#endif
-#else
+#include <arch/mm/frame.h>
+#include <mm/mm.h>
+#include <arch/exception.h>
+#include <trace.h>
+
+#define PAGE_WIDTH      FRAME_WIDTH
+#define PAGE_SIZE       FRAME_SIZE
+
 #ifndef __ASM__
 #       define KA2PA(x) (((uintptr_t) (x)) - 0x80000000)
@@ -53 +52 @@
 #       define PA2KA(x) ((x) + 0x80000000)
 #endif
+
+/* Number of entries in each level. */
+#define PTL0_ENTRIES_ARCH       (1 << 12)       /* 4096 */
+#define PTL1_ENTRIES_ARCH       0
+#define PTL2_ENTRIES_ARCH       0
+/* coarse page tables used (256 * 4 = 1KB per page) */
+#define PTL3_ENTRIES_ARCH       (1 << 8)        /* 256 */
+
+/* Page table sizes for each level. */
+#define PTL0_SIZE_ARCH          FOUR_FRAMES
+#define PTL1_SIZE_ARCH          0
+#define PTL2_SIZE_ARCH          0
+#define PTL3_SIZE_ARCH          ONE_FRAME
+
+/* Macros calculating indices into page tables for each level. */
+#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)
+
+/* Get PTE address accessors for each level. */
+#define GET_PTL1_ADDRESS_ARCH(ptl0, i) \
+        ((pte_t *) ((((pte_t *)(ptl0))[(i)].l0).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_t *)(ptl3))[(i)].l1).frame_base_addr << 12))
+
+/* Set PTE address accessors for each level. */
+#define SET_PTL0_ADDRESS_ARCH(ptl0) \
+        (set_ptl0_addr((pte_t *) (ptl0)))
+#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) \
+        (((pte_t *) (ptl0))[(i)].l0.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_t *) (ptl3))[(i)].l1.frame_base_addr = (a) >> 12)
+
+/* Get PTE flags accessors for each level. */
+#define GET_PTL1_FLAGS_ARCH(ptl0, i) \
+        get_pt_level0_flags((pte_t *) (ptl0), (size_t) (i))
+#define GET_PTL2_FLAGS_ARCH(ptl1, i) \
+        PAGE_PRESENT
+#define GET_PTL3_FLAGS_ARCH(ptl2, i) \
+        PAGE_PRESENT
+#define GET_FRAME_FLAGS_ARCH(ptl3, i) \
+        get_pt_level1_flags((pte_t *) (ptl3), (size_t) (i))
+
+/* Set PTE flags accessors for each level. */
+#define SET_PTL1_FLAGS_ARCH(ptl0, i, x) \
+        set_pt_level0_flags((pte_t *) (ptl0), (size_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_t *) (ptl3), (size_t) (i), (x))
+
+/* Macros for querying the last-level PTE entries. */
+#define PTE_VALID_ARCH(pte) \
+        (*((uint32_t *) (pte)) != 0)
+#define PTE_PRESENT_ARCH(pte) \
+        (((pte_t *) (pte))->l0.descriptor_type != 0)
+#define PTE_GET_FRAME_ARCH(pte) \
+        (((pte_t *) (pte))->l1.frame_base_addr << FRAME_WIDTH)
+#define PTE_WRITABLE_ARCH(pte) \
+        (((pte_t *) (pte))->l1.access_permission_0 == PTE_AP_USER_RW_KERNEL_RW)
+#define PTE_EXECUTABLE_ARCH(pte) \
+        1
+
+#ifndef __ASM__
+
+/** Level 0 page table entry. */
+typedef struct {
+        /* 0b01 for coarse tables, see below for details */
+        unsigned descriptor_type : 2;
+        unsigned impl_specific : 3;
+        unsigned domain : 4;
+        unsigned should_be_zero : 1;
+
+        /* Pointer to the coarse 2nd level page table (holding entries for small
+         * (4KB) or large (64KB) pages. ARM also supports fine 2nd level page
+         * tables that may hold even tiny pages (1KB) but they are bigger (4KB
+         * per table in comparison with 1KB per the coarse table)
+         */
+        unsigned coarse_table_addr : 22;
+} ATTRIBUTE_PACKED pte_level0_t;
+
+/** Level 1 page table entry (small (4KB) pages used). */
+typedef struct {
+
+        /* 0b10 for small pages */
+        unsigned descriptor_type : 2;
+        unsigned bufferable : 1;
+        unsigned cacheable : 1;
+
+        /* access permissions for each of 4 subparts of a page
+         * (for each 1KB when small pages used */
+        unsigned access_permission_0 : 2;
+        unsigned access_permission_1 : 2;
+        unsigned access_permission_2 : 2;
+        unsigned access_permission_3 : 2;
+        unsigned frame_base_addr : 20;
+} ATTRIBUTE_PACKED pte_level1_t;
+
+typedef union {
+        pte_level0_t l0;
+        pte_level1_t l1;
+} pte_t;
+
+/* Level 1 page tables access permissions */
+
+/** User mode: no access, privileged mode: no access. */
+#define PTE_AP_USER_NO_KERNEL_NO        0
+
+/** User mode: no access, privileged mode: read/write. */
+#define PTE_AP_USER_NO_KERNEL_RW        1
+
+/** User mode: read only, privileged mode: read/write. */
+#define PTE_AP_USER_RO_KERNEL_RW        2
+
+/** User mode: read/write, privileged mode: read/write. */
+#define PTE_AP_USER_RW_KERNEL_RW        3
+
+
+/* pte_level0_t and pte_level1_t descriptor_type flags */
+
+/** pte_level0_t and pte_level1_t "not present" flag (used in descriptor_type). */
+#define PTE_DESCRIPTOR_NOT_PRESENT      0
+
+/** pte_level0_t coarse page table flag (used in descriptor_type). */
+#define PTE_DESCRIPTOR_COARSE_TABLE     1
+
+/** pte_level1_t small page table flag (used in descriptor type). */
+#define PTE_DESCRIPTOR_SMALL_PAGE       2
+
+
+/** Sets the address of level 0 page table.
+ *
+ * @param pt Pointer to the page table to set.
+ *
+ */
+NO_TRACE static inline void set_ptl0_addr(pte_t *pt)
+{
+        asm volatile (
+                "mcr p15, 0, %[pt], c2, c0, 0\n"
+                :: [pt] "r" (pt)
+        );
+}
+
+
+/** Returns level 0 page table entry flags.
+ *
+ * @param pt Level 0 page table.
+ * @param i  Index of the entry to return.
+ *
+ */
+NO_TRACE static inline int get_pt_level0_flags(pte_t *pt, size_t i)
+{
+        pte_level0_t *p = &pt[i].l0;
+        int np = (p->descriptor_type == PTE_DESCRIPTOR_NOT_PRESENT);
+        
+        return (np << PAGE_PRESENT_SHIFT) | (1 << PAGE_USER_SHIFT) |
+            (1 << PAGE_READ_SHIFT) | (1 << PAGE_WRITE_SHIFT) |
+            (1 << PAGE_EXEC_SHIFT) | (1 << PAGE_CACHEABLE_SHIFT);
+}
+
+/** Returns level 1 page table entry flags.
+ *
+ * @param pt Level 1 page table.
+ * @param i  Index of the entry to return.
+ *
+ */
+NO_TRACE static inline int get_pt_level1_flags(pte_t *pt, size_t i)
+{
+        pte_level1_t *p = &pt[i].l1;
+        
+        int dt = p->descriptor_type;
+        int ap = p->access_permission_0;
+        
+        return ((dt == PTE_DESCRIPTOR_NOT_PRESENT) << PAGE_PRESENT_SHIFT) |
+            ((ap == PTE_AP_USER_RO_KERNEL_RW) << PAGE_READ_SHIFT) |
+            ((ap == PTE_AP_USER_RW_KERNEL_RW) << PAGE_READ_SHIFT) |
+            ((ap == PTE_AP_USER_RW_KERNEL_RW) << PAGE_WRITE_SHIFT) |
+            ((ap != PTE_AP_USER_NO_KERNEL_RW) << PAGE_USER_SHIFT) |
+            ((ap == PTE_AP_USER_NO_KERNEL_RW) << PAGE_READ_SHIFT) |
+            ((ap == PTE_AP_USER_NO_KERNEL_RW) << PAGE_WRITE_SHIFT) |
+            (1 << PAGE_EXEC_SHIFT) |
+            (p->bufferable << PAGE_CACHEABLE);
+}
+
+/** Sets flags of level 0 page table entry.
+ *
+ * @param pt    level 0 page table
+ * @param i     index of the entry to be changed
+ * @param flags new flags
+ *
+ */
+NO_TRACE static inline void set_pt_level0_flags(pte_t *pt, size_t i, int flags)
+{
+        pte_level0_t *p = &pt[i].l0;
+        
+        if (flags & PAGE_NOT_PRESENT) {
+                p->descriptor_type = PTE_DESCRIPTOR_NOT_PRESENT;
+                /*
+                 * Ensures that the entry will be recognized as valid when
+                 * PTE_VALID_ARCH applied.
+                 */
+                p->should_be_zero = 1;
+        } else {
+                p->descriptor_type = PTE_DESCRIPTOR_COARSE_TABLE;
+                p->should_be_zero = 0;
+        }
+}
+
+
+/** Sets flags of level 1 page table entry.
+ *
+ * We use same access rights for the whole page. When page
+ * is not preset we store 1 in acess_rigts_3 so that at least
+ * one bit is 1 (to mark correct page entry, see #PAGE_VALID_ARCH).
+ *
+ * @param pt    Level 1 page table.
+ * @param i     Index of the entry to be changed.
+ * @param flags New flags.
+ *
+ */
+NO_TRACE static inline void set_pt_level1_flags(pte_t *pt, size_t i, int flags)
+{
+        pte_level1_t *p = &pt[i].l1;
+        
+        if (flags & PAGE_NOT_PRESENT) {
+                p->descriptor_type = PTE_DESCRIPTOR_NOT_PRESENT;
+                p->access_permission_3 = 1;
+        } else {
+                p->descriptor_type = PTE_DESCRIPTOR_SMALL_PAGE;
+                p->access_permission_3 = p->access_permission_0;
+        }
+        
+        p->cacheable = p->bufferable = (flags & PAGE_CACHEABLE) != 0;
+        
+        /* default access permission */
+        p->access_permission_0 = p->access_permission_1 = 
+            p->access_permission_2 = p->access_permission_3 =
+            PTE_AP_USER_NO_KERNEL_RW;
+        
+        if (flags & PAGE_USER)  {
+                if (flags & PAGE_READ) {
+                        p->access_permission_0 = p->access_permission_1 = 
+                            p->access_permission_2 = p->access_permission_3 = 
+                            PTE_AP_USER_RO_KERNEL_RW;
+                }
+                if (flags & PAGE_WRITE) {
+                        p->access_permission_0 = p->access_permission_1 = 
+                            p->access_permission_2 = p->access_permission_3 = 
+                            PTE_AP_USER_RW_KERNEL_RW; 
+                }
+        }
+}
+
+
+extern void page_arch_init(void);
+
+
+#endif /* __ASM__ */
+
 #endif
 
-#if defined(PROCESSOR_armv7)
-#include "page_armv7.h"
-#elif defined(PROCESSOR_armv4) | defined(PROCESSOR_armv5)
-#include "page_armv4.h"
-#endif
-
-#endif
-
 /** @}
  */