/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SPARC64_PAGE_H
#define _SPARC64_PAGE_H

#include <linux/const.h>

#include <vdso/page.h>

/* Flushing for D-cache alias handling is only needed if
 * the page size is smaller than 16K.
 */
#if PAGE_SHIFT < 14
#define DCACHE_ALIASING_POSSIBLE
#endif

#define HPAGE_SHIFT             23
#define REAL_HPAGE_SHIFT        22
#define HPAGE_16GB_SHIFT        34
#define HPAGE_2GB_SHIFT         31
#define HPAGE_256MB_SHIFT       28
#define HPAGE_64K_SHIFT         16
#define REAL_HPAGE_SIZE         (_AC(1,UL) << REAL_HPAGE_SHIFT)

#if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
#define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
#define HPAGE_MASK              (~(HPAGE_SIZE - 1UL))
#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#define REAL_HPAGE_PER_HPAGE    (_AC(1,UL) << (HPAGE_SHIFT - REAL_HPAGE_SHIFT))
#define HUGE_MAX_HSTATE         5
#endif

#ifndef __ASSEMBLER__

#if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
struct pt_regs;
void hugetlb_setup(struct pt_regs *regs);
#endif

#define WANT_PAGE_VIRTUAL

void _clear_page(void *page);
#define clear_page(X)   _clear_page((void *)(X))
struct page;
void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
#define clear_user_page clear_user_page
#define copy_page(X,Y)  memcpy((void *)(X), (void *)(Y), PAGE_SIZE)
void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *topage);
#define __HAVE_ARCH_COPY_USER_HIGHPAGE
struct vm_area_struct;
void copy_user_highpage(struct page *to, struct page *from,
                        unsigned long vaddr, struct vm_area_struct *vma);
#define __HAVE_ARCH_COPY_HIGHPAGE
void copy_highpage(struct page *to, struct page *from);

/* Unlike sparc32, sparc64's parameter passing API is more
 * sane in that structures which as small enough are passed
 * in registers instead of on the stack.  Thus, setting
 * STRICT_MM_TYPECHECKS does not generate worse code so
 * let's enable it to get the type checking.
 */

#define STRICT_MM_TYPECHECKS

#ifdef STRICT_MM_TYPECHECKS
/* These are used to make use of C type-checking.. */
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long iopte; } iopte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pud; } pud_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;

#define pte_val(x)      ((x).pte)
#define iopte_val(x)    ((x).iopte)
#define pmd_val(x)      ((x).pmd)
#define pud_val(x)      ((x).pud)
#define pgd_val(x)      ((x).pgd)
#define pgprot_val(x)   ((x).pgprot)

#define __pte(x)        ((pte_t) { (x) } )
#define __iopte(x)      ((iopte_t) { (x) } )
#define __pmd(x)        ((pmd_t) { (x) } )
#define __pud(x)        ((pud_t) { (x) } )
#define __pgd(x)        ((pgd_t) { (x) } )
#define __pgprot(x)     ((pgprot_t) { (x) } )

#else
/* .. while these make it easier on the compiler */
typedef unsigned long pte_t;
typedef unsigned long iopte_t;
typedef unsigned long pmd_t;
typedef unsigned long pud_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;

#define pte_val(x)      (x)
#define iopte_val(x)    (x)
#define pmd_val(x)      (x)
#define pud_val(x)      (x)
#define pgd_val(x)      (x)
#define pgprot_val(x)   (x)

#define __pte(x)        (x)
#define __iopte(x)      (x)
#define __pmd(x)        (x)
#define __pud(x)        (x)
#define __pgd(x)        (x)
#define __pgprot(x)     (x)

#endif /* (STRICT_MM_TYPECHECKS) */

typedef pte_t *pgtable_t;

extern unsigned long sparc64_va_hole_top;
extern unsigned long sparc64_va_hole_bottom;

/* The next two defines specify the actual exclusion region we
 * enforce, wherein we use a 4GB red zone on each side of the VA hole.
 */
#define VA_EXCLUDE_START (sparc64_va_hole_bottom - (1UL << 32UL))
#define VA_EXCLUDE_END   (sparc64_va_hole_top + (1UL << 32UL))

#define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_32BIT) ? \
                                 _AC(0x0000000070000000,UL) : \
                                 VA_EXCLUDE_END)

#include <asm-generic/memory_model.h>

extern unsigned long PAGE_OFFSET;

#endif /* !(__ASSEMBLER__) */

/* The maximum number of physical memory address bits we support.  The
 * largest value we can support is whatever "KPGD_SHIFT + KPTE_BITS"
 * evaluates to.
 */
#define MAX_PHYS_ADDRESS_BITS   53

#define ILOG2_4MB               22
#define ILOG2_256MB             28

#ifndef __ASSEMBLER__

#define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
#define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))

#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)

#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)

#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#define virt_to_phys __pa
#define phys_to_virt __va

#endif /* !(__ASSEMBLER__) */

#include <asm-generic/getorder.h>

#endif /* _SPARC64_PAGE_H */