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/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#ifndef __ASM_CSKY_PGTABLE_H
#define __ASM_CSKY_PGTABLE_H
#include <asm/fixmap.h>
#include <asm/memory.h>
#include <asm/addrspace.h>
#include <abi/pgtable-bits.h>
#include <asm-generic/pgtable-nopmd.h>
#define PGDIR_SHIFT 22
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0UL
/*
* C-SKY is two-level paging structure:
*/
#define PGD_ORDER 0
#define PTE_ORDER 0
#define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
#define PTRS_PER_PMD 1
#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
#define pte_ERROR(e) \
pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
#define pgd_ERROR(e) \
pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
/* Find an entry in the third-level page table.. */
#define __pte_offset_t(address) \
(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset_kernel(dir, address) \
(pmd_page_vaddr(*(dir)) + __pte_offset_t(address))
#define pte_offset_map(dir, address) \
((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset_t(address))
#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#define pte_clear(mm, addr, ptep) set_pte((ptep), \
(((unsigned int) addr & PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
#define pte_pfn(x) ((unsigned long)((x).pte_low >> PAGE_SHIFT))
#define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
| pgprot_val(prot))
#define __READABLE (_PAGE_READ | _PAGE_VALID | _PAGE_ACCESSED)
#define __WRITEABLE (_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED)
#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | \
_CACHE_MASK)
#define pte_unmap(pte) ((void)(pte))
#define __swp_type(x) (((x).val >> 4) & 0xff)
#define __swp_offset(x) ((x).val >> 12)
#define __swp_entry(type, offset) ((swp_entry_t) {((type) << 4) | \
((offset) << 12) })
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
#define pte_page(x) pfn_to_page(pte_pfn(x))
#define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \
pgprot_val(pgprot))
/*
* CSKY can't do page protection for execute, and considers that the same like
* read. Also, write permissions imply read permissions. This is the closest
* we can get by reasonable means..
*/
#define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHED)
#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
_CACHE_CACHED)
#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
_PAGE_GLOBAL | _CACHE_CACHED)
#define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
_CACHE_CACHED)
#define _PAGE_IOREMAP \
(_PAGE_PRESENT | __READABLE | __WRITEABLE | _PAGE_GLOBAL | \
_CACHE_UNCACHED | _PAGE_SO)
#define __P000 PAGE_NONE
#define __P001 PAGE_READONLY
#define __P010 PAGE_COPY
#define __P011 PAGE_COPY
#define __P100 PAGE_READONLY
#define __P101 PAGE_READONLY
#define __P110 PAGE_COPY
#define __P111 PAGE_COPY
#define __S000 PAGE_NONE
#define __S001 PAGE_READONLY
#define __S010 PAGE_SHARED
#define __S011 PAGE_SHARED
#define __S100 PAGE_READONLY
#define __S101 PAGE_READONLY
#define __S110 PAGE_SHARED
#define __S111 PAGE_SHARED
extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
extern void load_pgd(unsigned long pg_dir);
extern pte_t invalid_pte_table[PTRS_PER_PTE];
static inline void set_pte(pte_t *p, pte_t pte)
{
*p = pte;
#if defined(CONFIG_CPU_NEED_TLBSYNC)
dcache_wb_line((u32)p);
#endif
/* prevent out of order excution */
smp_mb();
}
#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
static inline pte_t *pmd_page_vaddr(pmd_t pmd)
{
unsigned long ptr;
ptr = pmd_val(pmd);
return __va(ptr);
}
#define pmd_phys(pmd) pmd_val(pmd)
static inline void set_pmd(pmd_t *p, pmd_t pmd)
{
*p = pmd;
#if defined(CONFIG_CPU_NEED_TLBSYNC)
dcache_wb_line((u32)p);
#endif
/* prevent specul excute */
smp_mb();
}
static inline int pmd_none(pmd_t pmd)
{
return pmd_val(pmd) == __pa(invalid_pte_table);
}
#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
static inline int pmd_present(pmd_t pmd)
{
return (pmd_val(pmd) != __pa(invalid_pte_table));
}
static inline void pmd_clear(pmd_t *p)
{
pmd_val(*p) = (__pa(invalid_pte_table));
#if defined(CONFIG_CPU_NEED_TLBSYNC)
dcache_wb_line((u32)p);
#endif
}
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
static inline int pte_read(pte_t pte)
{
return pte.pte_low & _PAGE_READ;
}
static inline int pte_write(pte_t pte)
{
return (pte).pte_low & _PAGE_WRITE;
}
static inline int pte_dirty(pte_t pte)
{
return (pte).pte_low & _PAGE_MODIFIED;
}
static inline int pte_young(pte_t pte)
{
return (pte).pte_low & _PAGE_ACCESSED;
}
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
return pte;
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
return pte;
}
static inline pte_t pte_mkold(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
return pte;
}
static inline pte_t pte_mkwrite(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_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_mkyoung(pte_t pte)
{
pte_val(pte) |= _PAGE_ACCESSED;
if (pte_val(pte) & _PAGE_READ)
pte_val(pte) |= _PAGE_VALID;
return pte;
}
#define __pgd_offset(address) pgd_index(address)
#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
#define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
#define pgd_index(address) ((address) >> PGDIR_SHIFT)
#define __HAVE_PHYS_MEM_ACCESS_PROT
struct file;
extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t vma_prot);
/*
* Macro to make mark a page protection value as "uncacheable". Note
* that "protection" is really a misnomer here as the protection value
* contains the memory attribute bits, dirty bits, and various other
* bits as well.
*/
#define pgprot_noncached pgprot_noncached
static inline pgprot_t pgprot_noncached(pgprot_t _prot)
{
unsigned long prot = pgprot_val(_prot);
prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO;
return __pgprot(prot);
}
#define pgprot_writecombine pgprot_writecombine
static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
{
unsigned long prot = pgprot_val(_prot);
prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
return __pgprot(prot);
}
/*
* 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)));
}
/* to find an entry in a page-table-directory */
static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address)
{
return mm->pgd + pgd_index(address);
}
/* Find an entry in the third-level page table.. */
static inline pte_t *pte_offset(pmd_t *dir, unsigned long address)
{
return (pte_t *) (pmd_page_vaddr(*dir)) +
((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
}
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern void paging_init(void);
void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
pte_t *pte);
/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
#define kern_addr_valid(addr) (1)
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
remap_pfn_range(vma, vaddr, pfn, size, prot)
#include <asm-generic/pgtable.h>
#endif /* __ASM_CSKY_PGTABLE_H */
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