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-rw-r--r--arch/um/include/asm/pgtable.h287
1 files changed, 125 insertions, 162 deletions
diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
index bf974f712af7..3b42b0f45bf6 100644
--- a/arch/um/include/asm/pgtable.h
+++ b/arch/um/include/asm/pgtable.h
@@ -1,31 +1,35 @@
-/*
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Copyright 2003 PathScale, Inc.
* Derived from include/asm-i386/pgtable.h
- * Licensed under the GPL
*/
#ifndef __UM_PGTABLE_H
#define __UM_PGTABLE_H
-#include <asm/fixmap.h>
+#include <asm/page.h>
+#include <linux/mm_types.h>
#define _PAGE_PRESENT 0x001
-#define _PAGE_NEWPAGE 0x002
-#define _PAGE_NEWPROT 0x004
+#define _PAGE_NEEDSYNC 0x002
#define _PAGE_RW 0x020
#define _PAGE_USER 0x040
#define _PAGE_ACCESSED 0x080
#define _PAGE_DIRTY 0x100
/* If _PAGE_PRESENT is clear, we use these: */
-#define _PAGE_FILE 0x008 /* nonlinear file mapping, saved PTE; unset:swap */
#define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE;
pte_present gives true */
-#ifdef CONFIG_3_LEVEL_PGTABLES
-#include <asm/pgtable-3level.h>
-#else
+/* We borrow bit 10 to store the exclusive marker in swap PTEs. */
+#define _PAGE_SWP_EXCLUSIVE 0x400
+
+#if CONFIG_PGTABLE_LEVELS == 4
+#include <asm/pgtable-4level.h>
+#elif CONFIG_PGTABLE_LEVELS == 2
#include <asm/pgtable-2level.h>
+#else
+#error "Unsupported number of page table levels"
#endif
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
@@ -33,8 +37,6 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
/* zero page used for uninitialized stuff */
extern unsigned long *empty_zero_page;
-#define pgtable_cache_init() do ; while (0)
-
/* 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
@@ -43,19 +45,15 @@ extern unsigned long *empty_zero_page;
* area for the same reason. ;)
*/
-extern unsigned long end_iomem;
+#ifndef COMPILE_OFFSETS
+#include <as-layout.h> /* for high_physmem */
+#endif
#define VMALLOC_OFFSET (__va_space)
-#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
-#define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK)
-#ifdef CONFIG_HIGHMEM
-# define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE)
-#else
-# define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
-#endif
+#define VMALLOC_START ((high_physmem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#define VMALLOC_END (TASK_SIZE-2*PAGE_SIZE)
#define MODULES_VADDR VMALLOC_START
#define MODULES_END VMALLOC_END
-#define MODULES_LEN (MODULES_VADDR - MODULES_END)
#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
@@ -75,23 +73,6 @@ extern unsigned long end_iomem;
* Also, write permissions imply read permissions. This is the closest we can
* get..
*/
-#define __P000 PAGE_NONE
-#define __P001 PAGE_READONLY
-#define __P010 PAGE_COPY
-#define __P011 PAGE_COPY
-#define __P100 PAGE_READONLY
-#define __P101 PAGE_READONLY
-#define __P110 PAGE_COPY
-#define __P111 PAGE_COPY
-
-#define __S000 PAGE_NONE
-#define __S001 PAGE_READONLY
-#define __S010 PAGE_SHARED
-#define __S011 PAGE_SHARED
-#define __S100 PAGE_READONLY
-#define __S101 PAGE_READONLY
-#define __S110 PAGE_SHARED
-#define __S111 PAGE_SHARED
/*
* ZERO_PAGE is a global shared page that is always zero: used
@@ -99,20 +80,24 @@ extern unsigned long end_iomem;
*/
#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
-#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))
+#define pte_clear(mm, addr, xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEEDSYNC))
-#define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))
+#define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEEDSYNC))
#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
-#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
+#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEEDSYNC; } while (0)
-#define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE)
-#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
+#define pmd_needsync(x) (pmd_val(x) & _PAGE_NEEDSYNC)
+#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEEDSYNC)
-#define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE)
-#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)
+#define pud_needsync(x) (pud_val(x) & _PAGE_NEEDSYNC)
+#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEEDSYNC)
+#define p4d_needsync(x) (p4d_val(x) & _PAGE_NEEDSYNC)
+#define p4d_mkuptodate(x) (p4d_val(x) &= ~_PAGE_NEEDSYNC)
+
+#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
#define pte_page(x) pfn_to_page(pte_pfn(x))
@@ -135,7 +120,7 @@ static inline int pte_none(pte_t pte)
* Undefined behaviour if not..
*/
static inline int pte_read(pte_t pte)
-{
+{
return((pte_get_bits(pte, _PAGE_USER)) &&
!(pte_get_bits(pte, _PAGE_PROTNONE)));
}
@@ -151,14 +136,6 @@ static inline int pte_write(pte_t pte)
!(pte_get_bits(pte, _PAGE_PROTNONE)));
}
-/*
- * The following only works if pte_present() is not true.
- */
-static inline int pte_file(pte_t pte)
-{
- return pte_get_bits(pte, _PAGE_FILE);
-}
-
static inline int pte_dirty(pte_t pte)
{
return pte_get_bits(pte, _PAGE_DIRTY);
@@ -169,19 +146,9 @@ static inline int pte_young(pte_t pte)
return pte_get_bits(pte, _PAGE_ACCESSED);
}
-static inline int pte_newpage(pte_t pte)
+static inline int pte_needsync(pte_t pte)
{
- return pte_get_bits(pte, _PAGE_NEWPAGE);
-}
-
-static inline int pte_newprot(pte_t pte)
-{
- return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
-}
-
-static inline int pte_special(pte_t pte)
-{
- return 0;
+ return pte_get_bits(pte, _PAGE_NEEDSYNC);
}
/*
@@ -190,38 +157,32 @@ static inline int pte_special(pte_t pte)
* =================================
*/
-static inline pte_t pte_mknewprot(pte_t pte)
-{
- pte_set_bits(pte, _PAGE_NEWPROT);
- return(pte);
-}
-
static inline pte_t pte_mkclean(pte_t pte)
{
pte_clear_bits(pte, _PAGE_DIRTY);
return(pte);
}
-static inline pte_t pte_mkold(pte_t pte)
-{
+static inline pte_t pte_mkold(pte_t pte)
+{
pte_clear_bits(pte, _PAGE_ACCESSED);
return(pte);
}
static inline pte_t pte_wrprotect(pte_t pte)
-{
+{
pte_clear_bits(pte, _PAGE_RW);
- return(pte_mknewprot(pte));
+ return pte;
}
static inline pte_t pte_mkread(pte_t pte)
-{
+{
pte_set_bits(pte, _PAGE_USER);
- return(pte_mknewprot(pte));
+ return pte;
}
static inline pte_t pte_mkdirty(pte_t pte)
-{
+{
pte_set_bits(pte, _PAGE_DIRTY);
return(pte);
}
@@ -232,28 +193,21 @@ static inline pte_t pte_mkyoung(pte_t pte)
return(pte);
}
-static inline pte_t pte_mkwrite(pte_t pte)
+static inline pte_t pte_mkwrite_novma(pte_t pte)
{
pte_set_bits(pte, _PAGE_RW);
- return(pte_mknewprot(pte));
+ return pte;
}
-static inline pte_t pte_mkuptodate(pte_t pte)
+static inline pte_t pte_mkuptodate(pte_t pte)
{
- pte_clear_bits(pte, _PAGE_NEWPAGE);
- if(pte_present(pte))
- pte_clear_bits(pte, _PAGE_NEWPROT);
- return(pte);
+ pte_clear_bits(pte, _PAGE_NEEDSYNC);
+ return pte;
}
-static inline pte_t pte_mknewpage(pte_t pte)
-{
- pte_set_bits(pte, _PAGE_NEWPAGE);
- return(pte);
-}
-
-static inline pte_t pte_mkspecial(pte_t pte)
+static inline pte_t pte_mkneedsync(pte_t pte)
{
+ pte_set_bits(pte, _PAGE_NEEDSYNC);
return(pte);
}
@@ -261,115 +215,124 @@ static inline void set_pte(pte_t *pteptr, pte_t pteval)
{
pte_copy(*pteptr, pteval);
- /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
- * fix_range knows to unmap it. _PAGE_NEWPROT is specific to
- * mapped pages.
+ /* If it's a swap entry, it needs to be marked _PAGE_NEEDSYNC so
+ * update_pte_range knows to unmap it.
*/
- *pteptr = pte_mknewpage(*pteptr);
- if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
+ *pteptr = pte_mkneedsync(*pteptr);
+}
+
+#define PFN_PTE_SHIFT PAGE_SHIFT
+
+static inline void um_tlb_mark_sync(struct mm_struct *mm, unsigned long start,
+ unsigned long end)
+{
+ guard(spinlock_irqsave)(&mm->context.sync_tlb_lock);
+
+ if (!mm->context.sync_tlb_range_to) {
+ mm->context.sync_tlb_range_from = start;
+ mm->context.sync_tlb_range_to = end;
+ } else {
+ if (start < mm->context.sync_tlb_range_from)
+ mm->context.sync_tlb_range_from = start;
+ if (end > mm->context.sync_tlb_range_to)
+ mm->context.sync_tlb_range_to = end;
+ }
+}
+
+#define set_ptes set_ptes
+static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pte, int nr)
+{
+ /* Basically the default implementation */
+ size_t length = nr * PAGE_SIZE;
+
+ for (;;) {
+ set_pte(ptep, pte);
+ if (--nr == 0)
+ break;
+ ptep++;
+ pte = __pte(pte_val(pte) + (nr << PFN_PTE_SHIFT));
+ }
+
+ um_tlb_mark_sync(mm, addr, addr + length);
}
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
#define __HAVE_ARCH_PTE_SAME
static inline int pte_same(pte_t pte_a, pte_t pte_b)
{
- return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE);
+ return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEEDSYNC);
}
-/*
- * 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 phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
#define __virt_to_page(virt) phys_to_page(__pa(virt))
-#define page_to_phys(page) pfn_to_phys((pfn_t) page_to_pfn(page))
#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
-#define mk_pte(page, pgprot) \
- ({ pte_t pte; \
- \
- pte_set_val(pte, page_to_phys(page), (pgprot)); \
- if (pte_present(pte)) \
- pte_mknewprot(pte_mknewpage(pte)); \
- pte;})
+static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
+{
+ pte_t pte;
+
+ pte_set_val(pte, pfn_to_phys(pfn), pgprot);
+
+ return pte;
+}
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);
- return pte;
+ return pte;
}
/*
- * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
- *
- * this macro returns the index of the entry in the pgd page which would
- * control the given virtual address
- */
-#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
-
-/*
- * pgd_offset() returns a (pgd_t *)
- * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
- */
-#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
-
-/*
- * a shortcut which implies the use of the kernel's pgd, instead
- * of a process's
- */
-#define pgd_offset_k(address) pgd_offset(&init_mm, address)
-
-/*
* the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
*
* this macro returns the index of the entry in the pmd page which would
* control the given virtual address
*/
#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
-#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
-
-#define pmd_page_vaddr(pmd) \
- ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
-
-/*
- * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
- *
- * this macro returns the index of the entry in the pte page which would
- * control the given virtual address
- */
-#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_unmap(pte) do { } while (0)
struct mm_struct;
extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
-#define update_mmu_cache(vma,address,ptep) do ; while (0)
+#define update_mmu_cache(vma,address,ptep) do {} while (0)
+#define update_mmu_cache_range(vmf, vma, address, ptep, nr) do {} while (0)
-/* Encode and de-code a swap entry */
+/*
+ * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
+ * are !pte_none() && !pte_present().
+ *
+ * Format of swap PTEs:
+ *
+ * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
+ * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ * <--------------- offset ----------------> E < type -> 0 0 0 1 0
+ *
+ * E is the exclusive marker that is not stored in swap entries.
+ * _PAGE_NEEDSYNC (bit 1) is always set to 1 in set_pte().
+ */
#define __swp_type(x) (((x).val >> 5) & 0x1f)
#define __swp_offset(x) ((x).val >> 11)
#define __swp_entry(type, offset) \
- ((swp_entry_t) { ((type) << 5) | ((offset) << 11) })
+ ((swp_entry_t) { (((type) & 0x1f) << 5) | ((offset) << 11) })
#define __pte_to_swp_entry(pte) \
((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
-#define kern_addr_valid(addr) (1)
+static inline bool pte_swp_exclusive(pte_t pte)
+{
+ return pte_get_bits(pte, _PAGE_SWP_EXCLUSIVE);
+}
-#include <asm-generic/pgtable.h>
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_SWP_EXCLUSIVE);
+ return pte;
+}
-/* Clear a kernel PTE and flush it from the TLB */
-#define kpte_clear_flush(ptep, vaddr) \
-do { \
- pte_clear(&init_mm, (vaddr), (ptep)); \
- __flush_tlb_one((vaddr)); \
-} while (0)
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+ pte_clear_bits(pte, _PAGE_SWP_EXCLUSIVE);
+ return pte;
+}
#endif
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