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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*
* Derived from MIPS:
* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
*/
#ifndef _ASM_PGTABLE_H
#define _ASM_PGTABLE_H
#include <linux/compiler.h>
#include <asm/addrspace.h>
#include <asm/page.h>
#include <asm/pgtable-bits.h>
#if CONFIG_PGTABLE_LEVELS == 2
#include <asm-generic/pgtable-nopmd.h>
#elif CONFIG_PGTABLE_LEVELS == 3
#include <asm-generic/pgtable-nopud.h>
#else
#include <asm-generic/pgtable-nop4d.h>
#endif
#if CONFIG_PGTABLE_LEVELS == 2
#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3))
#elif CONFIG_PGTABLE_LEVELS == 3
#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3))
#define PMD_SIZE (1UL << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE-1))
#define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT - 3))
#elif CONFIG_PGTABLE_LEVELS == 4
#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3))
#define PMD_SIZE (1UL << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE-1))
#define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT - 3))
#define PUD_SIZE (1UL << PUD_SHIFT)
#define PUD_MASK (~(PUD_SIZE-1))
#define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT - 3))
#endif
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT - 3))
#define PTRS_PER_PGD (PAGE_SIZE >> 3)
#if CONFIG_PGTABLE_LEVELS > 3
#define PTRS_PER_PUD (PAGE_SIZE >> 3)
#endif
#if CONFIG_PGTABLE_LEVELS > 2
#define PTRS_PER_PMD (PAGE_SIZE >> 3)
#endif
#define PTRS_PER_PTE (PAGE_SIZE >> 3)
#define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
#ifndef __ASSEMBLY__
#include <linux/mm_types.h>
#include <linux/mmzone.h>
#include <asm/fixmap.h>
#include <asm/sparsemem.h>
struct mm_struct;
struct vm_area_struct;
/*
* ZERO_PAGE is a global shared page that is always zero; used
* for zero-mapped memory areas etc..
*/
extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
/*
* TLB refill handlers may also map the vmalloc area into xkvrange.
* Avoid the first couple of pages so NULL pointer dereferences will
* still reliably trap.
*/
#define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
#define MODULES_END (MODULES_VADDR + SZ_256M)
#ifdef CONFIG_KFENCE
#define KFENCE_AREA_SIZE (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE)
#else
#define KFENCE_AREA_SIZE 0
#endif
#define VMALLOC_START MODULES_END
#ifndef CONFIG_KASAN
#define VMALLOC_END \
(vm_map_base + \
min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE)
#else
#define VMALLOC_END \
(vm_map_base + \
min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits) / 2) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE)
#endif
#define vmemmap ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK))
#define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1)
#define KFENCE_AREA_START (VMEMMAP_END + 1)
#define KFENCE_AREA_END (KFENCE_AREA_START + KFENCE_AREA_SIZE - 1)
#define ptep_get(ptep) READ_ONCE(*(ptep))
#define pmdp_get(pmdp) READ_ONCE(*(pmdp))
#define pte_ERROR(e) \
pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
#ifndef __PAGETABLE_PMD_FOLDED
#define pmd_ERROR(e) \
pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
#endif
#ifndef __PAGETABLE_PUD_FOLDED
#define pud_ERROR(e) \
pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
#endif
#define pgd_ERROR(e) \
pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
extern pte_t invalid_pte_table[PTRS_PER_PTE];
#ifndef __PAGETABLE_PUD_FOLDED
typedef struct { unsigned long pud; } pud_t;
#define pud_val(x) ((x).pud)
#define __pud(x) ((pud_t) { (x) })
extern pud_t invalid_pud_table[PTRS_PER_PUD];
/*
* Empty pgd/p4d entries point to the invalid_pud_table.
*/
static inline int p4d_none(p4d_t p4d)
{
return p4d_val(p4d) == (unsigned long)invalid_pud_table;
}
static inline int p4d_bad(p4d_t p4d)
{
return p4d_val(p4d) & ~PAGE_MASK;
}
static inline int p4d_present(p4d_t p4d)
{
return p4d_val(p4d) != (unsigned long)invalid_pud_table;
}
static inline pud_t *p4d_pgtable(p4d_t p4d)
{
return (pud_t *)p4d_val(p4d);
}
static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
{
WRITE_ONCE(*p4d, p4dval);
}
static inline void p4d_clear(p4d_t *p4dp)
{
set_p4d(p4dp, __p4d((unsigned long)invalid_pud_table));
}
#define p4d_phys(p4d) PHYSADDR(p4d_val(p4d))
#define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
#endif
#ifndef __PAGETABLE_PMD_FOLDED
typedef struct { unsigned long pmd; } pmd_t;
#define pmd_val(x) ((x).pmd)
#define __pmd(x) ((pmd_t) { (x) })
extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
/*
* Empty pud entries point to the invalid_pmd_table.
*/
static inline int pud_none(pud_t pud)
{
return pud_val(pud) == (unsigned long)invalid_pmd_table;
}
static inline int pud_bad(pud_t pud)
{
return pud_val(pud) & ~PAGE_MASK;
}
static inline int pud_present(pud_t pud)
{
return pud_val(pud) != (unsigned long)invalid_pmd_table;
}
static inline pmd_t *pud_pgtable(pud_t pud)
{
return (pmd_t *)pud_val(pud);
}
static inline void set_pud(pud_t *pud, pud_t pudval)
{
WRITE_ONCE(*pud, pudval);
}
static inline void pud_clear(pud_t *pudp)
{
set_pud(pudp, __pud((unsigned long)invalid_pmd_table));
}
#define pud_phys(pud) PHYSADDR(pud_val(pud))
#define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
#endif
/*
* Empty pmd entries point to the invalid_pte_table.
*/
static inline int pmd_none(pmd_t pmd)
{
return pmd_val(pmd) == (unsigned long)invalid_pte_table;
}
static inline int pmd_bad(pmd_t pmd)
{
return (pmd_val(pmd) & ~PAGE_MASK);
}
static inline int pmd_present(pmd_t pmd)
{
if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID));
return pmd_val(pmd) != (unsigned long)invalid_pte_table;
}
static inline void set_pmd(pmd_t *pmd, pmd_t pmdval)
{
WRITE_ONCE(*pmd, pmdval);
}
static inline void pmd_clear(pmd_t *pmdp)
{
set_pmd(pmdp, __pmd((unsigned long)invalid_pte_table));
}
#define pmd_phys(pmd) PHYSADDR(pmd_val(pmd))
#ifndef CONFIG_TRANSPARENT_HUGEPAGE
#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#define pmd_page_vaddr(pmd) pmd_val(pmd)
extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd);
#define pte_page(x) pfn_to_page(pte_pfn(x))
#define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT))
#define pfn_pte(pfn, prot) __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
#define pfn_pmd(pfn, prot) __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
/*
* Initialize a new pgd / pud / pmd table with invalid pointers.
*/
extern void pgd_init(void *addr);
extern void pud_init(void *addr);
extern void pmd_init(void *addr);
/*
* Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
* are !pte_none() && !pte_present().
*
* Format of swap PTEs:
*
* 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3
* 3 2 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
* <--------------------------- offset ---------------------------
*
* 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
* --------------> E <--- type ---> <---------- zeroes ---------->
*
* E is the exclusive marker that is not stored in swap entries.
* The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE.
*/
static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
{ pte_t pte; pte_val(pte) = ((type & 0x7f) << 16) | (offset << 24); return pte; }
#define __swp_type(x) (((x).val >> 16) & 0x7f)
#define __swp_offset(x) ((x).val >> 24)
#define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
#define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
#define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE })
static inline int pte_swp_exclusive(pte_t pte)
{
return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
}
static inline pte_t pte_swp_mkexclusive(pte_t pte)
{
pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
return pte;
}
static inline pte_t pte_swp_clear_exclusive(pte_t pte)
{
pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
return pte;
}
extern void paging_init(void);
#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
#define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
#define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
static inline void set_pte(pte_t *ptep, pte_t pteval)
{
WRITE_ONCE(*ptep, pteval);
if (pte_val(pteval) & _PAGE_GLOBAL) {
pte_t *buddy = ptep_buddy(ptep);
/*
* Make sure the buddy is global too (if it's !none,
* it better already be global)
*/
#ifdef CONFIG_SMP
/*
* For SMP, multiple CPUs can race, so we need to do
* this atomically.
*/
unsigned long page_global = _PAGE_GLOBAL;
unsigned long tmp;
__asm__ __volatile__ (
"1:" __LL "%[tmp], %[buddy] \n"
" bnez %[tmp], 2f \n"
" or %[tmp], %[tmp], %[global] \n"
__SC "%[tmp], %[buddy] \n"
" beqz %[tmp], 1b \n"
" nop \n"
"2: \n"
__WEAK_LLSC_MB
: [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
: [global] "r" (page_global));
#else /* !CONFIG_SMP */
if (pte_none(ptep_get(buddy)))
WRITE_ONCE(*buddy, __pte(pte_val(ptep_get(buddy)) | _PAGE_GLOBAL));
#endif /* CONFIG_SMP */
}
}
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
/* Preserve global status for the pair */
if (pte_val(ptep_get(ptep_buddy(ptep))) & _PAGE_GLOBAL)
set_pte(ptep, __pte(_PAGE_GLOBAL));
else
set_pte(ptep, __pte(0));
}
#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
extern pgd_t swapper_pg_dir[];
extern pgd_t invalid_pg_dir[];
struct page *dmw_virt_to_page(unsigned long kaddr);
struct page *tlb_virt_to_page(unsigned long kaddr);
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); }
static inline pte_t pte_mkold(pte_t pte)
{
pte_val(pte) &= ~_PAGE_ACCESSED;
return pte;
}
static inline pte_t pte_mkyoung(pte_t pte)
{
pte_val(pte) |= _PAGE_ACCESSED;
return pte;
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
return pte;
}
static inline pte_t pte_mkdirty(pte_t pte)
{
pte_val(pte) |= _PAGE_MODIFIED;
if (pte_val(pte) & _PAGE_WRITE)
pte_val(pte) |= _PAGE_DIRTY;
return pte;
}
static inline pte_t pte_mkwrite_novma(pte_t pte)
{
pte_val(pte) |= _PAGE_WRITE;
if (pte_val(pte) & _PAGE_MODIFIED)
pte_val(pte) |= _PAGE_DIRTY;
return pte;
}
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
return pte;
}
static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
static inline pte_t pte_mkhuge(pte_t pte)
{
pte_val(pte) |= _PAGE_HUGE;
return pte;
}
#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; }
#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
#define pte_accessible pte_accessible
static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
{
if (pte_val(a) & _PAGE_PRESENT)
return true;
if ((pte_val(a) & _PAGE_PROTNONE) &&
atomic_read(&mm->tlb_flush_pending))
return true;
return false;
}
/*
* 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)
{
return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
(pgprot_val(newprot) & ~_PAGE_CHG_MASK));
}
extern void __update_tlb(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep);
static inline void update_mmu_cache_range(struct vm_fault *vmf,
struct vm_area_struct *vma, unsigned long address,
pte_t *ptep, unsigned int nr)
{
for (;;) {
__update_tlb(vma, address, ptep);
if (--nr == 0)
break;
address += PAGE_SIZE;
ptep++;
}
}
#define update_mmu_cache(vma, addr, ptep) \
update_mmu_cache_range(NULL, vma, addr, ptep, 1)
#define __HAVE_ARCH_UPDATE_MMU_TLB
#define update_mmu_tlb update_mmu_cache
static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
__update_tlb(vma, address, (pte_t *)pmdp);
}
static inline unsigned long pmd_pfn(pmd_t pmd)
{
return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT;
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
#define pmdp_establish generic_pmdp_establish
static inline int pmd_trans_huge(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd);
}
static inline pmd_t pmd_mkhuge(pmd_t pmd)
{
pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) |
((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
pmd_val(pmd) |= _PAGE_HUGE;
return pmd;
}
#define pmd_write pmd_write
static inline int pmd_write(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_WRITE);
}
static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
{
pmd_val(pmd) |= _PAGE_WRITE;
if (pmd_val(pmd) & _PAGE_MODIFIED)
pmd_val(pmd) |= _PAGE_DIRTY;
return pmd;
}
static inline pmd_t pmd_wrprotect(pmd_t pmd)
{
pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
return pmd;
}
#define pmd_dirty pmd_dirty
static inline int pmd_dirty(pmd_t pmd)
{
return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED));
}
static inline pmd_t pmd_mkclean(pmd_t pmd)
{
pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
return pmd;
}
static inline pmd_t pmd_mkdirty(pmd_t pmd)
{
pmd_val(pmd) |= _PAGE_MODIFIED;
if (pmd_val(pmd) & _PAGE_WRITE)
pmd_val(pmd) |= _PAGE_DIRTY;
return pmd;
}
#define pmd_young pmd_young
static inline int pmd_young(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_ACCESSED);
}
static inline pmd_t pmd_mkold(pmd_t pmd)
{
pmd_val(pmd) &= ~_PAGE_ACCESSED;
return pmd;
}
static inline pmd_t pmd_mkyoung(pmd_t pmd)
{
pmd_val(pmd) |= _PAGE_ACCESSED;
return pmd;
}
static inline struct page *pmd_page(pmd_t pmd)
{
if (pmd_trans_huge(pmd))
return pfn_to_page(pmd_pfn(pmd));
return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
}
static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
{
pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) |
(pgprot_val(newprot) & ~_HPAGE_CHG_MASK);
return pmd;
}
static inline pmd_t pmd_mkinvalid(pmd_t pmd)
{
pmd_val(pmd) |= _PAGE_PRESENT_INVALID;
pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE);
return pmd;
}
/*
* The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
* different prototype.
*/
#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
unsigned long address, pmd_t *pmdp)
{
pmd_t old = pmdp_get(pmdp);
pmd_clear(pmdp);
return old;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#ifdef CONFIG_NUMA_BALANCING
static inline long pte_protnone(pte_t pte)
{
return (pte_val(pte) & _PAGE_PROTNONE);
}
static inline long pmd_protnone(pmd_t pmd)
{
return (pmd_val(pmd) & _PAGE_PROTNONE);
}
#endif /* CONFIG_NUMA_BALANCING */
#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
/*
* We provide our own get_unmapped area to cope with the virtual aliasing
* constraints placed on us by the cache architecture.
*/
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_PGTABLE_H */
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