| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2020 Synopsys, Inc. (www.synopsys.com) |
| */ |
| |
| /* |
| * Helpers for implemenintg paging levels |
| */ |
| |
| #ifndef _ASM_ARC_PGTABLE_LEVELS_H |
| #define _ASM_ARC_PGTABLE_LEVELS_H |
| |
| #if CONFIG_PGTABLE_LEVELS == 2 |
| |
| /* |
| * 2 level paging setup for software walked MMUv3 (ARC700) and MMUv4 (HS) |
| * |
| * [31] 32 bit virtual address [0] |
| * ------------------------------------------------------- |
| * | | <---------- PGDIR_SHIFT ----------> | |
| * | | | <-- PAGE_SHIFT --> | |
| * ------------------------------------------------------- |
| * | | | |
| * | | --> off in page frame |
| * | ---> index into Page Table |
| * ----> index into Page Directory |
| * |
| * Given software walk, the vaddr split is arbitrary set to 11:8:13 |
| * However enabling of super page in a 2 level regime pegs PGDIR_SHIFT to |
| * super page size. |
| */ |
| |
| #if defined(CONFIG_ARC_HUGEPAGE_16M) |
| #define PGDIR_SHIFT 24 |
| #elif defined(CONFIG_ARC_HUGEPAGE_2M) |
| #define PGDIR_SHIFT 21 |
| #else |
| /* |
| * No Super page case |
| * Default value provides 11:8:13 (8K), 10:10:12 (4K) |
| * Limits imposed by pgtable_t only PAGE_SIZE long |
| * (so 4K page can only have 1K entries: or 10 bits) |
| */ |
| #ifdef CONFIG_ARC_PAGE_SIZE_4K |
| #define PGDIR_SHIFT 22 |
| #else |
| #define PGDIR_SHIFT 21 |
| #endif |
| |
| #endif |
| |
| #else /* CONFIG_PGTABLE_LEVELS != 2 */ |
| |
| /* |
| * A default 3 level paging testing setup in software walked MMU |
| * MMUv4 (8K page): <4> : <7> : <8> : <13> |
| * A default 4 level paging testing setup in software walked MMU |
| * MMUv4 (8K page): <4> : <3> : <4> : <8> : <13> |
| */ |
| #define PGDIR_SHIFT 28 |
| #if CONFIG_PGTABLE_LEVELS > 3 |
| #define PUD_SHIFT 25 |
| #endif |
| #if CONFIG_PGTABLE_LEVELS > 2 |
| #define PMD_SHIFT 21 |
| #endif |
| |
| #endif /* CONFIG_PGTABLE_LEVELS */ |
| |
| #define PGDIR_SIZE BIT(PGDIR_SHIFT) |
| #define PGDIR_MASK (~(PGDIR_SIZE - 1)) |
| #define PTRS_PER_PGD BIT(32 - PGDIR_SHIFT) |
| |
| #if CONFIG_PGTABLE_LEVELS > 3 |
| #define PUD_SIZE BIT(PUD_SHIFT) |
| #define PUD_MASK (~(PUD_SIZE - 1)) |
| #define PTRS_PER_PUD BIT(PGDIR_SHIFT - PUD_SHIFT) |
| #endif |
| |
| #if CONFIG_PGTABLE_LEVELS > 2 |
| #define PMD_SIZE BIT(PMD_SHIFT) |
| #define PMD_MASK (~(PMD_SIZE - 1)) |
| #define PTRS_PER_PMD BIT(PUD_SHIFT - PMD_SHIFT) |
| #endif |
| |
| #define PTRS_PER_PTE BIT(PMD_SHIFT - PAGE_SHIFT) |
| |
| #ifndef __ASSEMBLY__ |
| |
| #if CONFIG_PGTABLE_LEVELS > 3 |
| #include <asm-generic/pgtable-nop4d.h> |
| #elif CONFIG_PGTABLE_LEVELS > 2 |
| #include <asm-generic/pgtable-nopud.h> |
| #else |
| #include <asm-generic/pgtable-nopmd.h> |
| #endif |
| |
| /* |
| * 1st level paging: pgd |
| */ |
| #define pgd_ERROR(e) \ |
| pr_crit("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) |
| |
| #if CONFIG_PGTABLE_LEVELS > 3 |
| |
| /* In 4 level paging, p4d_* macros work on pgd */ |
| #define p4d_none(x) (!p4d_val(x)) |
| #define p4d_bad(x) ((p4d_val(x) & ~PAGE_MASK)) |
| #define p4d_present(x) (p4d_val(x)) |
| #define p4d_clear(xp) do { p4d_val(*(xp)) = 0; } while (0) |
| #define p4d_pgtable(p4d) ((pud_t *)(p4d_val(p4d) & PAGE_MASK)) |
| #define p4d_page(p4d) virt_to_page(p4d_pgtable(p4d)) |
| #define set_p4d(p4dp, p4d) (*(p4dp) = p4d) |
| |
| /* |
| * 2nd level paging: pud |
| */ |
| #define pud_ERROR(e) \ |
| pr_crit("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e)) |
| |
| #endif |
| |
| #if CONFIG_PGTABLE_LEVELS > 2 |
| |
| /* |
| * In 3 level paging, pud_* macros work on pgd |
| * In 4 level paging, pud_* macros work on pud |
| */ |
| #define pud_none(x) (!pud_val(x)) |
| #define pud_bad(x) ((pud_val(x) & ~PAGE_MASK)) |
| #define pud_present(x) (pud_val(x)) |
| #define pud_clear(xp) do { pud_val(*(xp)) = 0; } while (0) |
| #define pud_pgtable(pud) ((pmd_t *)(pud_val(pud) & PAGE_MASK)) |
| #define pud_page(pud) virt_to_page(pud_pgtable(pud)) |
| #define set_pud(pudp, pud) (*(pudp) = pud) |
| |
| /* |
| * 3rd level paging: pmd |
| */ |
| #define pmd_ERROR(e) \ |
| pr_crit("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) |
| |
| #define pmd_pfn(pmd) ((pmd_val(pmd) & PMD_MASK) >> PAGE_SHIFT) |
| #define pfn_pmd(pfn,prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) |
| #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) |
| |
| #endif |
| |
| /* |
| * Due to the strange way generic pgtable level folding works, the pmd_* macros |
| * - are valid even for 2 levels (which supposedly only has pgd - pte) |
| * - behave differently for 2 vs. 3 |
| * In 2 level paging (pgd -> pte), pmd_* macros work on pgd |
| * In 3+ level paging (pgd -> pmd -> pte), pmd_* macros work on pmd |
| */ |
| #define pmd_none(x) (!pmd_val(x)) |
| #define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK)) |
| #define pmd_present(x) (pmd_val(x)) |
| #define pmd_clear(xp) do { pmd_val(*(xp)) = 0; } while (0) |
| #define pmd_page_vaddr(pmd) (pmd_val(pmd) & PAGE_MASK) |
| #define pmd_pfn(pmd) ((pmd_val(pmd) & PAGE_MASK) >> PAGE_SHIFT) |
| #define pmd_page(pmd) virt_to_page(pmd_page_vaddr(pmd)) |
| #define set_pmd(pmdp, pmd) (*(pmdp) = pmd) |
| #define pmd_pgtable(pmd) ((pgtable_t) pmd_page(pmd)) |
| |
| /* |
| * 4th level paging: pte |
| */ |
| #define pte_ERROR(e) \ |
| pr_crit("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) |
| |
| #define pte_none(x) (!pte_val(x)) |
| #define pte_present(x) (pte_val(x) & _PAGE_PRESENT) |
| #define pte_clear(mm,addr,ptep) set_pte_at(mm, addr, ptep, __pte(0)) |
| #define pte_page(pte) pfn_to_page(pte_pfn(pte)) |
| #define set_pte(ptep, pte) ((*(ptep)) = (pte)) |
| #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) |
| #define pfn_pte(pfn, prot) __pte(__pfn_to_phys(pfn) | pgprot_val(prot)) |
| #define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot) |
| |
| #ifdef CONFIG_ISA_ARCV2 |
| #define pmd_leaf(x) (pmd_val(x) & _PAGE_HW_SZ) |
| #endif |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| #endif |
