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/* 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
/*
* 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
#define PGDIR_SIZE BIT(PGDIR_SHIFT) /* vaddr span, not PDG sz */
#define PGDIR_MASK (~(PGDIR_SIZE - 1))
#define PTRS_PER_PGD BIT(32 - PGDIR_SHIFT)
#define PTRS_PER_PTE BIT(PGDIR_SHIFT - PAGE_SHIFT)
#ifndef __ASSEMBLY__
#include <asm-generic/pgtable-nopmd.h>
/*
* 1st level paging: pgd
*/
#define pgd_index(addr) ((addr) >> PGDIR_SHIFT)
#define pgd_offset(mm, addr) (((mm)->pgd) + pgd_index(addr))
#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
#define pgd_ERROR(e) \
pr_crit("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
/*
* Due to the strange way generic pgtable level folding works, in a 2 level
* setup, pmd_val() returns pgd, so these pmd_* macros actually work on pgd
*/
#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_page(pmd) virt_to_page(pmd_page_vaddr(pmd))
#define set_pmd(pmdp, pmd) (*(pmdp) = pmd)
#define pmd_pgtable(pmd) ((pgtable_t) pmd_page_vaddr(pmd))
#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
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