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