329 lines
8.8 KiB
C
329 lines
8.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_H
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#define _ASM_POWERPC_NOHASH_64_PGTABLE_H
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/*
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* This file contains the functions and defines necessary to modify and use
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* the ppc64 non-hashed page table.
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*/
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#include <linux/sizes.h>
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#include <asm/nohash/64/pgtable-4k.h>
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#include <asm/barrier.h>
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#include <asm/asm-const.h>
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/*
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* Size of EA range mapped by our pagetables.
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*/
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#define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
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PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
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#define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
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#define PMD_CACHE_INDEX PMD_INDEX_SIZE
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#define PUD_CACHE_INDEX PUD_INDEX_SIZE
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/*
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* Define the address range of the kernel non-linear virtual area
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*/
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#define KERN_VIRT_START ASM_CONST(0xc000100000000000)
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#define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000)
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/*
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* The vmalloc space starts at the beginning of that region, and
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* occupies a quarter of it on Book3E
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* (we keep a quarter for the virtual memmap)
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*/
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#define VMALLOC_START KERN_VIRT_START
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#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 2)
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#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
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/*
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* The third quarter of the kernel virtual space is used for IO mappings,
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* it's itself carved into the PIO region (ISA and PHB IO space) and
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* the ioremap space
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*
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* ISA_IO_BASE = KERN_IO_START, 64K reserved area
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* PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
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* IOREMAP_BASE = ISA_IO_BASE + 2G to KERN_IO_START + KERN_IO_SIZE
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*/
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#define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
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#define KERN_IO_SIZE (KERN_VIRT_SIZE >> 2)
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#define FULL_IO_SIZE 0x80000000ul
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#define ISA_IO_BASE (KERN_IO_START)
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#define ISA_IO_END (KERN_IO_START + 0x10000ul)
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#define PHB_IO_BASE (ISA_IO_END)
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#define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE)
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#define IOREMAP_BASE (PHB_IO_END)
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#define IOREMAP_START (ioremap_bot)
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#define IOREMAP_END (KERN_IO_START + KERN_IO_SIZE - FIXADDR_SIZE)
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#define FIXADDR_SIZE SZ_32M
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/*
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* Defines the address of the vmemap area, in its own region on
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* after the vmalloc space on Book3E
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*/
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#define VMEMMAP_BASE VMALLOC_END
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#define VMEMMAP_END KERN_IO_START
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#define vmemmap ((struct page *)VMEMMAP_BASE)
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/*
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* Include the PTE bits definitions
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*/
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#include <asm/nohash/pte-e500.h>
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#define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1))
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/*
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* _PAGE_CHG_MASK masks of bits that are to be preserved across
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* pgprot changes.
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*/
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#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL)
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#define H_PAGE_4K_PFN 0
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#ifndef __ASSEMBLY__
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/* pte_clear moved to later in this file */
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static inline pte_t pte_mkwrite(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_RW);
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}
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static inline pte_t pte_mkdirty(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_DIRTY);
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}
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static inline pte_t pte_mkyoung(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_ACCESSED);
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}
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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return __pte(pte_val(pte) & ~_PAGE_RW);
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}
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#define PMD_BAD_BITS (PTE_TABLE_SIZE-1)
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#define PUD_BAD_BITS (PMD_TABLE_SIZE-1)
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static inline void pmd_set(pmd_t *pmdp, unsigned long val)
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{
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*pmdp = __pmd(val);
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}
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static inline void pmd_clear(pmd_t *pmdp)
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{
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*pmdp = __pmd(0);
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}
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static inline pte_t pmd_pte(pmd_t pmd)
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{
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return __pte(pmd_val(pmd));
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}
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#define pmd_none(pmd) (!pmd_val(pmd))
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#define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \
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|| (pmd_val(pmd) & PMD_BAD_BITS))
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#define pmd_present(pmd) (!pmd_none(pmd))
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#define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS)
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extern struct page *pmd_page(pmd_t pmd);
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#define pmd_pfn(pmd) (page_to_pfn(pmd_page(pmd)))
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static inline void pud_set(pud_t *pudp, unsigned long val)
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{
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*pudp = __pud(val);
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}
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static inline void pud_clear(pud_t *pudp)
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{
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*pudp = __pud(0);
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}
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#define pud_none(pud) (!pud_val(pud))
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#define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \
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|| (pud_val(pud) & PUD_BAD_BITS))
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#define pud_present(pud) (pud_val(pud) != 0)
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static inline pmd_t *pud_pgtable(pud_t pud)
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{
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return (pmd_t *)(pud_val(pud) & ~PUD_MASKED_BITS);
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}
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extern struct page *pud_page(pud_t pud);
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static inline pte_t pud_pte(pud_t pud)
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{
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return __pte(pud_val(pud));
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}
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static inline pud_t pte_pud(pte_t pte)
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{
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return __pud(pte_val(pte));
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}
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#define pud_write(pud) pte_write(pud_pte(pud))
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#define p4d_write(pgd) pte_write(p4d_pte(p4d))
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static inline void p4d_set(p4d_t *p4dp, unsigned long val)
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{
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*p4dp = __p4d(val);
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}
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/* Atomic PTE updates */
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static inline unsigned long pte_update(struct mm_struct *mm,
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unsigned long addr,
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pte_t *ptep, unsigned long clr,
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unsigned long set,
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int huge)
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{
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unsigned long old = pte_val(*ptep);
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*ptep = __pte((old & ~clr) | set);
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/* huge pages use the old page table lock */
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if (!huge)
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assert_pte_locked(mm, addr);
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return old;
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}
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static inline int pte_young(pte_t pte)
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{
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return pte_val(pte) & _PAGE_ACCESSED;
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}
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static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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unsigned long old;
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if (pte_young(*ptep))
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return 0;
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old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
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return (old & _PAGE_ACCESSED) != 0;
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}
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#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
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#define ptep_test_and_clear_young(__vma, __addr, __ptep) \
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({ \
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int __r; \
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__r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
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__r; \
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})
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#define __HAVE_ARCH_PTEP_SET_WRPROTECT
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static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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if ((pte_val(*ptep) & _PAGE_RW) == 0)
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return;
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pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
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}
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#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
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static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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if ((pte_val(*ptep) & _PAGE_RW) == 0)
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return;
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pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
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}
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#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
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#define ptep_clear_flush_young(__vma, __address, __ptep) \
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({ \
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int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
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__ptep); \
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__young; \
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})
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#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
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static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
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return __pte(old);
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}
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static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
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pte_t * ptep)
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{
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pte_update(mm, addr, ptep, ~0UL, 0, 0);
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}
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/* Set the dirty and/or accessed bits atomically in a linux PTE */
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static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
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pte_t *ptep, pte_t entry,
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unsigned long address,
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int psize)
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{
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unsigned long bits = pte_val(entry) &
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(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
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unsigned long old = pte_val(*ptep);
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*ptep = __pte(old | bits);
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flush_tlb_page(vma, address);
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}
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#define pte_ERROR(e) \
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pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
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#define pmd_ERROR(e) \
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pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
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#define pgd_ERROR(e) \
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pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
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/*
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* Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
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* are !pte_none() && !pte_present().
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*
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* Format of swap PTEs:
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*
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* 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* <-------------------------- offset ----------------------------
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*
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* 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 6 6 6 6
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* 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
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* --------------> <----------- zero ------------> E < type -> 0 0
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*
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* E is the exclusive marker that is not stored in swap entries.
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*/
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#define MAX_SWAPFILES_CHECK() do { \
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BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
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} while (0)
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#define SWP_TYPE_BITS 5
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#define __swp_type(x) (((x).val >> 2) \
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& ((1UL << SWP_TYPE_BITS) - 1))
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#define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT)
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#define __swp_entry(type, offset) ((swp_entry_t) { \
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(((type) & 0x1f) << 2) \
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| ((offset) << PTE_RPN_SHIFT) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
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#define __swp_entry_to_pte(x) __pte((x).val)
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/* We borrow MSB 56 (LSB 7) to store the exclusive marker in swap PTEs. */
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#define _PAGE_SWP_EXCLUSIVE 0x80
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int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot);
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void unmap_kernel_page(unsigned long va);
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extern int __meminit vmemmap_create_mapping(unsigned long start,
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unsigned long page_size,
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unsigned long phys);
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extern void vmemmap_remove_mapping(unsigned long start,
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unsigned long page_size);
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void __patch_exception(int exc, unsigned long addr);
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#define patch_exception(exc, name) do { \
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extern unsigned int name; \
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__patch_exception((exc), (unsigned long)&name); \
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} while (0)
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */
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