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/* SPDX-License-Identifier: GPL-2.0 */
/*
* S390 version
* Copyright IBM Corp. 1999, 2000
* Author(s): Hartmut Penner (hp@de.ibm.com)
*/
#ifndef _S390_PAGE_H
#define _S390_PAGE_H
#include <linux/const.h>
#include <asm/types.h>
#define _PAGE_SHIFT 12
#define _PAGE_SIZE (_AC(1, UL) << _PAGE_SHIFT)
#define _PAGE_MASK (~(_PAGE_SIZE - 1))
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT _PAGE_SHIFT
#define PAGE_SIZE _PAGE_SIZE
#define PAGE_MASK _PAGE_MASK
#define PAGE_DEFAULT_ACC _AC(0, UL)
/* storage-protection override */
#define PAGE_SPO_ACC 9
#define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
#define HPAGE_SHIFT 20
#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
#define HPAGE_MASK (~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
#define HUGE_MAX_HSTATE 2
#define ARCH_HAS_SETCLEAR_HUGE_PTE
#define ARCH_HAS_HUGE_PTE_TYPE
#define ARCH_HAS_PREPARE_HUGEPAGE
#define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#include <asm/setup.h>
#ifndef __ASSEMBLY__
void __storage_key_init_range(unsigned long start, unsigned long end);
static inline void storage_key_init_range(unsigned long start, unsigned long end)
{
if (PAGE_DEFAULT_KEY != 0)
__storage_key_init_range(start, end);
}
#define clear_page(page) memset((page), 0, PAGE_SIZE)
/*
* copy_page uses the mvcl instruction with 0xb0 padding byte in order to
* bypass caches when copying a page. Especially when copying huge pages
* this keeps L1 and L2 data caches alive.
*/
static inline void copy_page(void *to, void *from)
{
union register_pair dst, src;
dst.even = (unsigned long) to;
dst.odd = 0x1000;
src.even = (unsigned long) from;
src.odd = 0xb0001000;
asm volatile(
" mvcl %[dst],%[src]"
: [dst] "+&d" (dst.pair), [src] "+&d" (src.pair)
: : "memory", "cc");
}
#define clear_user_page(page, vaddr, pg) clear_page(page)
#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
#define vma_alloc_zeroed_movable_folio(vma, vaddr) \
vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false)
/*
* These are used to make use of C type-checking..
*/
typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct { unsigned long pgste; } pgste_t;
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pud; } pud_t;
typedef struct { unsigned long p4d; } p4d_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef pte_t *pgtable_t;
#define pgprot_val(x) ((x).pgprot)
#define pgste_val(x) ((x).pgste)
static inline unsigned long pte_val(pte_t pte)
{
return pte.pte;
}
static inline unsigned long pmd_val(pmd_t pmd)
{
return pmd.pmd;
}
static inline unsigned long pud_val(pud_t pud)
{
return pud.pud;
}
static inline unsigned long p4d_val(p4d_t p4d)
{
return p4d.p4d;
}
static inline unsigned long pgd_val(pgd_t pgd)
{
return pgd.pgd;
}
#define __pgste(x) ((pgste_t) { (x) } )
#define __pte(x) ((pte_t) { (x) } )
#define __pmd(x) ((pmd_t) { (x) } )
#define __pud(x) ((pud_t) { (x) } )
#define __p4d(x) ((p4d_t) { (x) } )
#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
static inline void page_set_storage_key(unsigned long addr,
unsigned char skey, int mapped)
{
if (!mapped)
asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
: : "d" (skey), "a" (addr));
else
asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
}
static inline unsigned char page_get_storage_key(unsigned long addr)
{
unsigned char skey;
asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
return skey;
}
static inline int page_reset_referenced(unsigned long addr)
{
int cc;
asm volatile(
" rrbe 0,%1\n"
" ipm %0\n"
" srl %0,28\n"
: "=d" (cc) : "a" (addr) : "cc");
return cc;
}
/* Bits int the storage key */
#define _PAGE_CHANGED 0x02 /* HW changed bit */
#define _PAGE_REFERENCED 0x04 /* HW referenced bit */
#define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */
#define _PAGE_ACC_BITS 0xf0 /* HW access control bits */
struct page;
void arch_free_page(struct page *page, int order);
void arch_alloc_page(struct page *page, int order);
static inline int devmem_is_allowed(unsigned long pfn)
{
return 0;
}
#define HAVE_ARCH_FREE_PAGE
#define HAVE_ARCH_ALLOC_PAGE
#if IS_ENABLED(CONFIG_PGSTE)
int arch_make_page_accessible(struct page *page);
#define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE
#endif
#define __PAGE_OFFSET 0x0UL
#define PAGE_OFFSET 0x0UL
#define __pa(x) ((unsigned long)(x))
#define __va(x) ((void *)(unsigned long)(x))
#define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT)
#define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
#define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
#define page_to_phys(page) pfn_to_phys(page_to_pfn(page))
static inline void *pfn_to_virt(unsigned long pfn)
{
return __va(pfn_to_phys(pfn));
}
static inline unsigned long virt_to_pfn(const void *kaddr)
{
return phys_to_pfn(__pa(kaddr));
}
#define pfn_to_kaddr(pfn) pfn_to_virt(pfn)
#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
#define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
#define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
#endif /* !__ASSEMBLY__ */
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>
#endif /* _S390_PAGE_H */
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