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328 lines
10 KiB
C
328 lines
10 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_PGTABLE_H
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#define __ASM_PGTABLE_H
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#include <asm/proc-fns.h>
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#include <asm/memory.h>
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#include <asm/pgtable-hwdef.h>
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/*
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* Software defined PTE bits definition.
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*/
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#define PTE_VALID (_AT(pteval_t, 1) << 0)
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#define PTE_PROT_NONE (_AT(pteval_t, 1) << 1) /* only when !PTE_VALID */
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#define PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !pte_present() */
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#define PTE_DIRTY (_AT(pteval_t, 1) << 55)
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#define PTE_SPECIAL (_AT(pteval_t, 1) << 56)
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/*
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* VMALLOC and SPARSEMEM_VMEMMAP ranges.
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*/
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#define VMALLOC_START UL(0xffffff8000000000)
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#define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K)
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#define vmemmap ((struct page *)(VMALLOC_END + SZ_64K))
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#define FIRST_USER_ADDRESS 0
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#ifndef __ASSEMBLY__
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extern void __pte_error(const char *file, int line, unsigned long val);
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extern void __pmd_error(const char *file, int line, unsigned long val);
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extern void __pgd_error(const char *file, int line, unsigned long val);
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#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte))
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#ifndef CONFIG_ARM64_64K_PAGES
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#define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
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#endif
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#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
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/*
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* The pgprot_* and protection_map entries will be fixed up at runtime to
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* include the cachable and bufferable bits based on memory policy, as well as
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* any architecture dependent bits like global/ASID and SMP shared mapping
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* bits.
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*/
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#define _PAGE_DEFAULT PTE_TYPE_PAGE | PTE_AF
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extern pgprot_t pgprot_default;
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#define __pgprot_modify(prot,mask,bits) \
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__pgprot((pgprot_val(prot) & ~(mask)) | (bits))
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#define _MOD_PROT(p, b) __pgprot_modify(p, 0, b)
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#define PAGE_NONE __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE)
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#define PAGE_SHARED _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
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#define PAGE_SHARED_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)
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#define PAGE_COPY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
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#define PAGE_COPY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
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#define PAGE_READONLY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
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#define PAGE_READONLY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
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#define PAGE_KERNEL _MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY)
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#define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY)
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#define __PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE)
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#define __PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
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#define __PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
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#define __PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
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#define __PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
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#define __PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
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#define __PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
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#endif /* __ASSEMBLY__ */
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#define __P000 __PAGE_NONE
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#define __P001 __PAGE_READONLY
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#define __P010 __PAGE_COPY
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#define __P011 __PAGE_COPY
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#define __P100 __PAGE_READONLY_EXEC
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#define __P101 __PAGE_READONLY_EXEC
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#define __P110 __PAGE_COPY_EXEC
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#define __P111 __PAGE_COPY_EXEC
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#define __S000 __PAGE_NONE
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#define __S001 __PAGE_READONLY
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#define __S010 __PAGE_SHARED
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#define __S011 __PAGE_SHARED
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#define __S100 __PAGE_READONLY_EXEC
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#define __S101 __PAGE_READONLY_EXEC
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#define __S110 __PAGE_SHARED_EXEC
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#define __S111 __PAGE_SHARED_EXEC
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#ifndef __ASSEMBLY__
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/*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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extern struct page *empty_zero_page;
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#define ZERO_PAGE(vaddr) (empty_zero_page)
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#define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
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#define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
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#define pte_none(pte) (!pte_val(pte))
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#define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0))
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#define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
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#define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr))
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#define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
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#define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
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#define pte_unmap(pte) do { } while (0)
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#define pte_unmap_nested(pte) do { } while (0)
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/*
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* The following only work if pte_present(). Undefined behaviour otherwise.
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*/
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#define pte_present(pte) (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE))
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#define pte_dirty(pte) (pte_val(pte) & PTE_DIRTY)
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#define pte_young(pte) (pte_val(pte) & PTE_AF)
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#define pte_special(pte) (pte_val(pte) & PTE_SPECIAL)
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#define pte_write(pte) (!(pte_val(pte) & PTE_RDONLY))
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#define pte_exec(pte) (!(pte_val(pte) & PTE_UXN))
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#define pte_valid_user(pte) \
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((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))
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#define PTE_BIT_FUNC(fn,op) \
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static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
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PTE_BIT_FUNC(wrprotect, |= PTE_RDONLY);
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PTE_BIT_FUNC(mkwrite, &= ~PTE_RDONLY);
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PTE_BIT_FUNC(mkclean, &= ~PTE_DIRTY);
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PTE_BIT_FUNC(mkdirty, |= PTE_DIRTY);
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PTE_BIT_FUNC(mkold, &= ~PTE_AF);
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PTE_BIT_FUNC(mkyoung, |= PTE_AF);
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PTE_BIT_FUNC(mkspecial, |= PTE_SPECIAL);
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static inline void set_pte(pte_t *ptep, pte_t pte)
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{
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*ptep = pte;
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}
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extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
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static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte)
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{
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if (pte_valid_user(pte)) {
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if (pte_exec(pte))
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__sync_icache_dcache(pte, addr);
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if (!pte_dirty(pte))
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pte = pte_wrprotect(pte);
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}
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set_pte(ptep, pte);
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}
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/*
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* Huge pte definitions.
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*/
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#define pte_huge(pte) ((pte_val(pte) & PTE_TYPE_MASK) == PTE_TYPE_HUGEPAGE)
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#define pte_mkhuge(pte) (__pte((pte_val(pte) & ~PTE_TYPE_MASK) | PTE_TYPE_HUGEPAGE))
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#define __HAVE_ARCH_PTE_SPECIAL
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/*
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* Mark the prot value as uncacheable and unbufferable.
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*/
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#define pgprot_noncached(prot) \
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__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE))
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#define pgprot_writecombine(prot) \
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__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_GRE))
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#define pgprot_dmacoherent(prot) \
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__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC))
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#define __HAVE_PHYS_MEM_ACCESS_PROT
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struct file;
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extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t vma_prot);
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#define pmd_none(pmd) (!pmd_val(pmd))
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#define pmd_present(pmd) (pmd_val(pmd))
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#define pmd_bad(pmd) (!(pmd_val(pmd) & 2))
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static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
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{
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*pmdp = pmd;
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dsb();
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}
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static inline void pmd_clear(pmd_t *pmdp)
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{
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set_pmd(pmdp, __pmd(0));
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}
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static inline pte_t *pmd_page_vaddr(pmd_t pmd)
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{
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return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
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}
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#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*/
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#define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot)
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#ifndef CONFIG_ARM64_64K_PAGES
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#define pud_none(pud) (!pud_val(pud))
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#define pud_bad(pud) (!(pud_val(pud) & 2))
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#define pud_present(pud) (pud_val(pud))
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static inline void set_pud(pud_t *pudp, pud_t pud)
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{
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*pudp = pud;
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dsb();
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}
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static inline void pud_clear(pud_t *pudp)
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{
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set_pud(pudp, __pud(0));
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}
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static inline pmd_t *pud_page_vaddr(pud_t pud)
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{
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return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
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}
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#endif /* CONFIG_ARM64_64K_PAGES */
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/* to find an entry in a page-table-directory */
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#define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
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#define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr))
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/* to find an entry in a kernel page-table-directory */
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#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
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/* Find an entry in the second-level page table.. */
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#ifndef CONFIG_ARM64_64K_PAGES
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#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
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static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
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{
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return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
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}
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#endif
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/* Find an entry in the third-level page table.. */
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#define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
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PTE_PROT_NONE | PTE_VALID;
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pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
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return pte;
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}
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
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#define SWAPPER_DIR_SIZE (3 * PAGE_SIZE)
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#define IDMAP_DIR_SIZE (2 * PAGE_SIZE)
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/*
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* Encode and decode a swap entry:
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* bits 0-1: present (must be zero)
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* bit 2: PTE_FILE
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* bits 3-8: swap type
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* bits 9-63: swap offset
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*/
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#define __SWP_TYPE_SHIFT 3
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#define __SWP_TYPE_BITS 6
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#define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1)
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#define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
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#define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
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#define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT)
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#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_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(swp) ((pte_t) { (swp).val })
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/*
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* Ensure that there are not more swap files than can be encoded in the kernel
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* the PTEs.
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*/
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#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
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/*
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* Encode and decode a file entry:
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* bits 0-1: present (must be zero)
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* bit 2: PTE_FILE
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* bits 3-63: file offset / PAGE_SIZE
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*/
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#define pte_file(pte) (pte_val(pte) & PTE_FILE)
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#define pte_to_pgoff(x) (pte_val(x) >> 3)
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#define pgoff_to_pte(x) __pte(((x) << 3) | PTE_FILE)
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#define PTE_FILE_MAX_BITS 61
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extern int kern_addr_valid(unsigned long addr);
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#include <asm-generic/pgtable.h>
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#define pgtable_cache_init() do { } while (0)
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_PGTABLE_H */
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