1 files changed, 363 insertions, 0 deletions
diff --git a/arch/m32r/include/asm/pgtable.h b/arch/m32r/include/asm/pgtable.h
new file mode 100644
index 0000000..e6359c5
--- /dev/null
+++ b/arch/m32r/include/asm/pgtable.h
@@ -0,0 +1,363 @@
+#ifndef _ASM_M32R_PGTABLE_H
+#define _ASM_M32R_PGTABLE_H
+
+#include <asm-generic/4level-fixup.h>
+
+#ifdef __KERNEL__
+/*
+ * The Linux memory management assumes a three-level page table setup. On
+ * the M32R, we use that, but "fold" the mid level into the top-level page
+ * table, so that we physically have the same two-level page table as the
+ * M32R mmu expects.
+ *
+ * This file contains the functions and defines necessary to modify and use
+ * the M32R page table tree.
+ */
+
+/* CAUTION!: If you change macro definitions in this file, you might have to
+ * change arch/m32r/mmu.S manually.
+ */
+
+#ifndef __ASSEMBLY__
+
+#include <linux/threads.h>
+#include <linux/bitops.h>
+#include <asm/processor.h>
+#include <asm/addrspace.h>
+#include <asm/page.h>
+
+struct mm_struct;
+struct vm_area_struct;
+
+extern pgd_t swapper_pg_dir[1024];
+extern void paging_init(void);
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+extern unsigned long empty_zero_page[1024];
+#define ZERO_PAGE(vaddr)	(virt_to_page(empty_zero_page))
+
+#endif /* !__ASSEMBLY__ */
+
+#ifndef __ASSEMBLY__
+#include <asm/pgtable-2level.h>
+#endif
+
+#define pgtable_cache_init()	do { } while (0)
+
+#define PMD_SIZE	(1UL << PMD_SHIFT)
+#define PMD_MASK	(~(PMD_SIZE - 1))
+#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
+#define PGDIR_MASK	(~(PGDIR_SIZE - 1))
+
+#define USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)
+#define FIRST_USER_ADDRESS	0
+
+#ifndef __ASSEMBLY__
+/* Just any arbitrary offset to the start of the vmalloc VM area: the
+ * current 8MB value just means that there will be a 8MB "hole" after the
+ * physical memory until the kernel virtual memory starts.  That means that
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ */
+#define VMALLOC_START		KSEG2
+#define VMALLOC_END		KSEG3
+
+/*
+ *     M32R TLB format
+ *
+ *     [0]    [1:19]           [20:23]       [24:31]
+ *     +-----------------------+----+-------------+
+ *     |          VPN          |0000|    ASID     |
+ *     +-----------------------+----+-------------+
+ *     +-+---------------------+----+-+---+-+-+-+-+
+ *     |0         PPN          |0000|N|AC |L|G|V| |
+ *     +-+---------------------+----+-+---+-+-+-+-+
+ *                                     RWX
+ */
+
+#define _PAGE_BIT_DIRTY		0	/* software: page changed */
+#define _PAGE_BIT_FILE		0	/* when !present: nonlinear file
+					   mapping */
+#define _PAGE_BIT_PRESENT	1	/* Valid: page is valid */
+#define _PAGE_BIT_GLOBAL	2	/* Global */
+#define _PAGE_BIT_LARGE		3	/* Large */
+#define _PAGE_BIT_EXEC		4	/* Execute */
+#define _PAGE_BIT_WRITE		5	/* Write */
+#define _PAGE_BIT_READ		6	/* Read */
+#define _PAGE_BIT_NONCACHABLE	7	/* Non cachable */
+#define _PAGE_BIT_ACCESSED	8	/* software: page referenced */
+#define _PAGE_BIT_PROTNONE	9	/* software: if not present */
+
+#define _PAGE_DIRTY		(1UL << _PAGE_BIT_DIRTY)
+#define _PAGE_FILE		(1UL << _PAGE_BIT_FILE)
+#define _PAGE_PRESENT		(1UL << _PAGE_BIT_PRESENT)
+#define _PAGE_GLOBAL		(1UL << _PAGE_BIT_GLOBAL)
+#define _PAGE_LARGE		(1UL << _PAGE_BIT_LARGE)
+#define _PAGE_EXEC		(1UL << _PAGE_BIT_EXEC)
+#define _PAGE_WRITE		(1UL << _PAGE_BIT_WRITE)
+#define _PAGE_READ		(1UL << _PAGE_BIT_READ)
+#define _PAGE_NONCACHABLE	(1UL << _PAGE_BIT_NONCACHABLE)
+#define _PAGE_ACCESSED		(1UL << _PAGE_BIT_ACCESSED)
+#define _PAGE_PROTNONE		(1UL << _PAGE_BIT_PROTNONE)
+
+#define _PAGE_TABLE	\
+	( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
+	| _PAGE_DIRTY )
+#define _KERNPG_TABLE	\
+	( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
+	| _PAGE_DIRTY )
+#define _PAGE_CHG_MASK	\
+	( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY )
+
+#ifdef CONFIG_MMU
+#define PAGE_NONE	\
+	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
+#define PAGE_SHARED	\
+	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)
+#define PAGE_SHARED_EXEC \
+	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \
+		| _PAGE_ACCESSED)
+#define PAGE_COPY	\
+	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
+#define PAGE_COPY_EXEC	\
+	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
+#define PAGE_READONLY	\
+	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
+#define PAGE_READONLY_EXEC \
+	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
+
+#define __PAGE_KERNEL	\
+	( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \
+	| _PAGE_ACCESSED )
+#define __PAGE_KERNEL_RO	( __PAGE_KERNEL & ~_PAGE_WRITE )
+#define __PAGE_KERNEL_NOCACHE	( __PAGE_KERNEL | _PAGE_NONCACHABLE)
+
+#define MAKE_GLOBAL(x)	__pgprot((x) | _PAGE_GLOBAL)
+
+#define PAGE_KERNEL		MAKE_GLOBAL(__PAGE_KERNEL)
+#define PAGE_KERNEL_RO		MAKE_GLOBAL(__PAGE_KERNEL_RO)
+#define PAGE_KERNEL_NOCACHE	MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
+
+#else
+#define PAGE_NONE		__pgprot(0)
+#define PAGE_SHARED		__pgprot(0)
+#define PAGE_SHARED_EXEC	__pgprot(0)
+#define PAGE_COPY		__pgprot(0)
+#define PAGE_COPY_EXEC		__pgprot(0)
+#define PAGE_READONLY		__pgprot(0)
+#define PAGE_READONLY_EXEC	__pgprot(0)
+
+#define PAGE_KERNEL		__pgprot(0)
+#define PAGE_KERNEL_RO		__pgprot(0)
+#define PAGE_KERNEL_NOCACHE	__pgprot(0)
+#endif /* CONFIG_MMU */
+
+	/* xwr */
+#define __P000	PAGE_NONE
+#define __P001	PAGE_READONLY
+#define __P010	PAGE_COPY
+#define __P011	PAGE_COPY
+#define __P100	PAGE_READONLY_EXEC
+#define __P101	PAGE_READONLY_EXEC
+#define __P110	PAGE_COPY_EXEC
+#define __P111	PAGE_COPY_EXEC
+
+#define __S000	PAGE_NONE
+#define __S001	PAGE_READONLY
+#define __S010	PAGE_SHARED
+#define __S011	PAGE_SHARED
+#define __S100	PAGE_READONLY_EXEC
+#define __S101	PAGE_READONLY_EXEC
+#define __S110	PAGE_SHARED_EXEC
+#define __S111	PAGE_SHARED_EXEC
+
+/* page table for 0-4MB for everybody */
+
+#define pte_present(x)	(pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
+#define pte_clear(mm,addr,xp)	do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
+
+#define pmd_none(x)	(!pmd_val(x))
+#define pmd_present(x)	(pmd_val(x) & _PAGE_PRESENT)
+#define pmd_clear(xp)	do { set_pmd(xp, __pmd(0)); } while (0)
+#define	pmd_bad(x)	((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)
+
+#define pages_to_mb(x)	((x) >> (20 - PAGE_SHIFT))
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+static inline int pte_dirty(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_DIRTY;
+}
+
+static inline int pte_young(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_ACCESSED;
+}
+
+static inline int pte_write(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_WRITE;
+}
+
+/*
+ * The following only works if pte_present() is not true.
+ */
+static inline int pte_file(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_FILE;
+}
+
+static inline int pte_special(pte_t pte)
+{
+	return 0;
+}
+
+static inline pte_t pte_mkclean(pte_t pte)
+{
+	pte_val(pte) &= ~_PAGE_DIRTY;
+	return pte;
+}
+
+static inline pte_t pte_mkold(pte_t pte)
+{
+	pte_val(pte) &= ~_PAGE_ACCESSED;
+	return pte;
+}
+
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+	pte_val(pte) &= ~_PAGE_WRITE;
+	return pte;
+}
+
+static inline pte_t pte_mkdirty(pte_t pte)
+{
+	pte_val(pte) |= _PAGE_DIRTY;
+	return pte;
+}
+
+static inline pte_t pte_mkyoung(pte_t pte)
+{
+	pte_val(pte) |= _PAGE_ACCESSED;
+	return pte;
+}
+
+static inline pte_t pte_mkwrite(pte_t pte)
+{
+	pte_val(pte) |= _PAGE_WRITE;
+	return pte;
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+	return pte;
+}
+
+static inline  int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
+{
+	return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
+}
+
+static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	clear_bit(_PAGE_BIT_WRITE, ptep);
+}
+
+/*
+ * Macro and implementation to make a page protection as uncachable.
+ */
+static inline pgprot_t pgprot_noncached(pgprot_t _prot)
+{
+	unsigned long prot = pgprot_val(_prot);
+
+	prot |= _PAGE_NONCACHABLE;
+	return __pgprot(prot);
+}
+
+#define pgprot_writecombine(prot) pgprot_noncached(prot)
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+#define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), pgprot)
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+	set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \
+		| pgprot_val(newprot)));
+
+	return pte;
+}
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+
+static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
+{
+	pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
+}
+
+#define pmd_page_vaddr(pmd)	\
+	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+
+#ifndef CONFIG_DISCONTIGMEM
+#define pmd_page(pmd)	(mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
+#endif /* !CONFIG_DISCONTIGMEM */
+
+/* to find an entry in a page-table-directory. */
+#define pgd_index(address)	\
+	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
+
+#define pgd_offset(mm, address)	((mm)->pgd + pgd_index(address))
+
+/* to find an entry in a kernel page-table-directory */
+#define pgd_offset_k(address)	pgd_offset(&init_mm, address)
+
+#define pmd_index(address)	\
+	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
+
+#define pte_index(address)	\
+	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define pte_offset_kernel(dir, address)	\
+	((pte_t *)pmd_page_vaddr(*(dir)) + pte_index(address))
+#define pte_offset_map(dir, address)	\
+	((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
+#define pte_offset_map_nested(dir, address)	pte_offset_map(dir, address)
+#define pte_unmap(pte)		do { } while (0)
+#define pte_unmap_nested(pte)	do { } while (0)
+
+/* Encode and de-code a swap entry */
+#define __swp_type(x)			(((x).val >> 2) & 0x1f)
+#define __swp_offset(x)			((x).val >> 10)
+#define __swp_entry(type, offset)	\
+	((swp_entry_t) { ((type) << 2) | ((offset) << 10) })
+#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(x)		((pte_t) { (x).val })
+
+#endif /* !__ASSEMBLY__ */
+
+/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
+#define kern_addr_valid(addr)	(1)
+
+#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)	\
+		remap_pfn_range(vma, vaddr, pfn, size, prot)
+
+#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
+#define __HAVE_ARCH_PTEP_SET_WRPROTECT
+#define __HAVE_ARCH_PTE_SAME
+#include <asm-generic/pgtable.h>
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_M32R_PGTABLE_H */