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