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-rw-r--r--arch/xtensa/include/asm/pgtable.h165
1 files changed, 95 insertions, 70 deletions
diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index b03c043ce75..4b0ca35a93b 100644
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -5,7 +5,7 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
- * Copyright (C) 2001 - 2007 Tensilica Inc.
+ * Copyright (C) 2001 - 2013 Tensilica Inc.
*/
#ifndef _XTENSA_PGTABLE_H
@@ -64,41 +64,82 @@
* Virtual memory area. We keep a distance to other memory regions to be
* on the safe side. We also use this area for cache aliasing.
*/
-
#define VMALLOC_START 0xC0000000
#define VMALLOC_END 0xC7FEFFFF
#define TLBTEMP_BASE_1 0xC7FF0000
#define TLBTEMP_BASE_2 0xC7FF8000
/*
- * Xtensa Linux config PTE layout (when present):
- * 31-12: PPN
- * 11-6: Software
- * 5-4: RING
- * 3-0: CA
+ * For the Xtensa architecture, the PTE layout is as follows:
+ *
+ * 31------12 11 10-9 8-6 5-4 3-2 1-0
+ * +-----------------------------------------+
+ * | | Software | HARDWARE |
+ * | PPN | ADW | RI |Attribute|
+ * +-----------------------------------------+
+ * pte_none | MBZ | 01 | 11 | 00 |
+ * +-----------------------------------------+
+ * present | PPN | 0 | 00 | ADW | RI | CA | wx |
+ * +- - - - - - - - - - - - - - - - - - - - -+
+ * (PAGE_NONE)| PPN | 0 | 00 | ADW | 01 | 11 | 11 |
+ * +-----------------------------------------+
+ * swap | index | type | 01 | 11 | 00 |
+ * +- - - - - - - - - - - - - - - - - - - - -+
+ * file | file offset | 01 | 11 | 10 |
+ * +-----------------------------------------+
*
- * Similar to the Alpha and MIPS ports, we need to keep track of the ref
- * and mod bits in software. We have a software "you can read
- * from this page" bit, and a hardware one which actually lets the
- * process read from the page. On the same token we have a software
- * writable bit and the real hardware one which actually lets the
- * process write to the page.
+ * For T1050 hardware and earlier the layout differs for present and (PAGE_NONE)
+ * +-----------------------------------------+
+ * present | PPN | 0 | 00 | ADW | RI | CA | w1 |
+ * +-----------------------------------------+
+ * (PAGE_NONE)| PPN | 0 | 00 | ADW | 01 | 01 | 00 |
+ * +-----------------------------------------+
*
- * See further below for PTE layout for swapped-out pages.
+ * Legend:
+ * PPN Physical Page Number
+ * ADW software: accessed (young) / dirty / writable
+ * RI ring (0=privileged, 1=user, 2 and 3 are unused)
+ * CA cache attribute: 00 bypass, 01 writeback, 10 writethrough
+ * (11 is invalid and used to mark pages that are not present)
+ * w page is writable (hw)
+ * x page is executable (hw)
+ * index swap offset / PAGE_SIZE (bit 11-31: 21 bits -> 8 GB)
+ * (note that the index is always non-zero)
+ * type swap type (5 bits -> 32 types)
+ * file offset 26-bit offset into the file, in increments of PAGE_SIZE
+ *
+ * Notes:
+ * - (PROT_NONE) is a special case of 'present' but causes an exception for
+ * any access (read, write, and execute).
+ * - 'multihit-exception' has the highest priority of all MMU exceptions,
+ * so the ring must be set to 'RING_USER' even for 'non-present' pages.
+ * - on older hardware, the exectuable flag was not supported and
+ * used as a 'valid' flag, so it needs to be always set.
+ * - we need to keep track of certain flags in software (dirty and young)
+ * to do this, we use write exceptions and have a separate software w-flag.
+ * - attribute value 1101 (and 1111 on T1050 and earlier) is reserved
*/
+#define _PAGE_ATTRIB_MASK 0xf
+
#define _PAGE_HW_EXEC (1<<0) /* hardware: page is executable */
#define _PAGE_HW_WRITE (1<<1) /* hardware: page is writable */
-#define _PAGE_FILE (1<<1) /* non-linear mapping, if !present */
-#define _PAGE_PROTNONE (3<<0) /* special case for VM_PROT_NONE */
-
-/* None of these cache modes include MP coherency: */
#define _PAGE_CA_BYPASS (0<<2) /* bypass, non-speculative */
#define _PAGE_CA_WB (1<<2) /* write-back */
#define _PAGE_CA_WT (2<<2) /* write-through */
#define _PAGE_CA_MASK (3<<2)
-#define _PAGE_INVALID (3<<2)
+#define _PAGE_CA_INVALID (3<<2)
+
+/* We use invalid attribute values to distinguish special pte entries */
+#if XCHAL_HW_VERSION_MAJOR < 2000
+#define _PAGE_HW_VALID 0x01 /* older HW needed this bit set */
+#define _PAGE_NONE 0x04
+#else
+#define _PAGE_HW_VALID 0x00
+#define _PAGE_NONE 0x0f
+#endif
+#define _PAGE_FILE (1<<1) /* file mapped page, only if !present */
#define _PAGE_USER (1<<4) /* user access (ring=1) */
@@ -108,19 +149,12 @@
#define _PAGE_DIRTY (1<<7) /* software: page dirty */
#define _PAGE_ACCESSED (1<<8) /* software: page accessed (read) */
-/* On older HW revisions, we always have to set bit 0 */
-#if XCHAL_HW_VERSION_MAJOR < 2000
-# define _PAGE_VALID (1<<0)
-#else
-# define _PAGE_VALID 0
-#endif
-
-#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
-#define _PAGE_PRESENT (_PAGE_VALID | _PAGE_CA_WB | _PAGE_ACCESSED)
-
#ifdef CONFIG_MMU
-#define PAGE_NONE __pgprot(_PAGE_INVALID | _PAGE_USER | _PAGE_PROTNONE)
+#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define _PAGE_PRESENT (_PAGE_HW_VALID | _PAGE_CA_WB | _PAGE_ACCESSED)
+
+#define PAGE_NONE __pgprot(_PAGE_NONE | _PAGE_USER)
#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER)
#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_HW_EXEC)
#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER)
@@ -132,9 +166,9 @@
#define PAGE_KERNEL_EXEC __pgprot(_PAGE_PRESENT|_PAGE_HW_WRITE|_PAGE_HW_EXEC)
#if (DCACHE_WAY_SIZE > PAGE_SIZE)
-# define _PAGE_DIRECTORY (_PAGE_VALID | _PAGE_ACCESSED)
+# define _PAGE_DIRECTORY (_PAGE_HW_VALID | _PAGE_ACCESSED | _PAGE_CA_BYPASS)
#else
-# define _PAGE_DIRECTORY (_PAGE_VALID | _PAGE_ACCESSED | _PAGE_CA_WB)
+# define _PAGE_DIRECTORY (_PAGE_HW_VALID | _PAGE_ACCESSED | _PAGE_CA_WB)
#endif
#else /* no mmu */
@@ -186,12 +220,11 @@ extern unsigned long empty_zero_page[1024];
#ifdef CONFIG_MMU
extern pgd_t swapper_pg_dir[PAGE_SIZE/sizeof(pgd_t)];
extern void paging_init(void);
-extern void pgtable_cache_init(void);
#else
# define swapper_pg_dir NULL
static inline void paging_init(void) { }
-static inline void pgtable_cache_init(void) { }
#endif
+static inline void pgtable_cache_init(void) { }
/*
* The pmd contains the kernel virtual address of the pte page.
@@ -202,12 +235,16 @@ static inline void pgtable_cache_init(void) { }
/*
* pte status.
*/
-#define pte_none(pte) (pte_val(pte) == _PAGE_INVALID)
-#define pte_present(pte) \
- (((pte_val(pte) & _PAGE_CA_MASK) != _PAGE_INVALID) \
- || ((pte_val(pte) & _PAGE_PROTNONE) == _PAGE_PROTNONE))
+# define pte_none(pte) (pte_val(pte) == (_PAGE_CA_INVALID | _PAGE_USER))
+#if XCHAL_HW_VERSION_MAJOR < 2000
+# define pte_present(pte) ((pte_val(pte) & _PAGE_CA_MASK) != _PAGE_CA_INVALID)
+#else
+# define pte_present(pte) \
+ (((pte_val(pte) & _PAGE_CA_MASK) != _PAGE_CA_INVALID) \
+ || ((pte_val(pte) & _PAGE_ATTRIB_MASK) == _PAGE_NONE))
+#endif
#define pte_clear(mm,addr,ptep) \
- do { update_pte(ptep, __pte(_PAGE_INVALID)); } while(0)
+ do { update_pte(ptep, __pte(_PAGE_CA_INVALID | _PAGE_USER)); } while (0)
#define pmd_none(pmd) (!pmd_val(pmd))
#define pmd_present(pmd) (pmd_val(pmd) & PAGE_MASK)
@@ -273,6 +310,10 @@ set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pteval)
update_pte(ptep, pteval);
}
+static inline void set_pte(pte_t *ptep, pte_t pteval)
+{
+ update_pte(ptep, pteval);
+}
static inline void
set_pmd(pmd_t *pmdp, pmd_t pmdval)
@@ -284,7 +325,7 @@ struct vm_area_struct;
static inline int
ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr,
- pte_t *ptep)
+ pte_t *ptep)
{
pte_t pte = *ptep;
if (!pte_young(pte))
@@ -304,8 +345,8 @@ ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
static inline void
ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
- pte_t pte = *ptep;
- update_pte(ptep, pte_wrprotect(pte));
+ pte_t pte = *ptep;
+ update_pte(ptep, pte_wrprotect(pte));
}
/* to find an entry in a kernel page-table-directory */
@@ -328,35 +369,23 @@ ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
/*
- * Encode and decode a swap entry.
- *
- * Format of swap pte:
- * bit 0 MBZ
- * bit 1 page-file (must be zero)
- * bits 2 - 3 page hw access mode (must be 11: _PAGE_INVALID)
- * bits 4 - 5 ring protection (must be 01: _PAGE_USER)
- * bits 6 - 10 swap type (5 bits -> 32 types)
- * bits 11 - 31 swap offset / PAGE_SIZE (21 bits -> 8GB)
-
- * Format of file pte:
- * bit 0 MBZ
- * bit 1 page-file (must be one: _PAGE_FILE)
- * bits 2 - 3 page hw access mode (must be 11: _PAGE_INVALID)
- * bits 4 - 5 ring protection (must be 01: _PAGE_USER)
- * bits 6 - 31 file offset / PAGE_SIZE
+ * Encode and decode a swap and file entry.
*/
+#define SWP_TYPE_BITS 5
+#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
#define __swp_type(entry) (((entry).val >> 6) & 0x1f)
#define __swp_offset(entry) ((entry).val >> 11)
#define __swp_entry(type,offs) \
- ((swp_entry_t) {((type) << 6) | ((offs) << 11) | _PAGE_INVALID})
+ ((swp_entry_t){((type) << 6) | ((offs) << 11) | \
+ _PAGE_CA_INVALID | _PAGE_USER})
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
-#define PTE_FILE_MAX_BITS 28
-#define pte_to_pgoff(pte) (pte_val(pte) >> 4)
+#define PTE_FILE_MAX_BITS 26
+#define pte_to_pgoff(pte) (pte_val(pte) >> 6)
#define pgoff_to_pte(off) \
- ((pte_t) { ((off) << 4) | _PAGE_INVALID | _PAGE_FILE })
+ ((pte_t) { ((off) << 6) | _PAGE_CA_INVALID | _PAGE_FILE | _PAGE_USER })
#endif /* !defined (__ASSEMBLY__) */
@@ -393,14 +422,6 @@ ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
extern void update_mmu_cache(struct vm_area_struct * vma,
unsigned long address, pte_t *ptep);
-/*
- * remap a physical page `pfn' of size `size' with page protection `prot'
- * into virtual address `from'
- */
-
-#define io_remap_pfn_range(vma,from,pfn,size,prot) \
- remap_pfn_range(vma, from, pfn, size, prot)
-
typedef pte_t *pte_addr_t;
#endif /* !defined (__ASSEMBLY__) */
@@ -410,6 +431,10 @@ typedef pte_t *pte_addr_t;
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
#define __HAVE_ARCH_PTEP_MKDIRTY
#define __HAVE_ARCH_PTE_SAME
+/* We provide our own get_unmapped_area to cope with
+ * SHM area cache aliasing for userland.
+ */
+#define HAVE_ARCH_UNMAPPED_AREA
#include <asm-generic/pgtable.h>
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 01:43:37 +0000