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

#include <linux/const.h>

#include <vdso/page.h>

#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA

#ifndef __ASSEMBLER__

#include <asm/types.h>
#include <asm/cache.h>

#define clear_page(page)        clear_page_asm((void *)(page))
#define copy_page(to, from)     copy_page_asm((void *)(to), (void *)(from))

struct page;
struct vm_area_struct;

void clear_page_asm(void *page);
void copy_page_asm(void *to, void *from);
void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr,
                struct vm_area_struct *vma);
#define __HAVE_ARCH_COPY_USER_HIGHPAGE

/*
 * These are used to make use of C type-checking..
 */
#define STRICT_MM_TYPECHECKS
#ifdef STRICT_MM_TYPECHECKS
typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */

/* NOTE: even on 64 bits, these entries are __u32 because we allocate
 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
typedef struct { __u32 pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;

#if CONFIG_PGTABLE_LEVELS == 3
typedef struct { __u32 pmd; } pmd_t;
#define __pmd(x)        ((pmd_t) { (x) } )
/* pXd_val() do not work as lvalues, so make sure we don't use them as such. */
#define pmd_val(x)      ((x).pmd + 0)
#endif

#define pte_val(x)      ((x).pte)
#define pgd_val(x)      ((x).pgd + 0)
#define pgprot_val(x)   ((x).pgprot)

#define __pte(x)        ((pte_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;

#if CONFIG_PGTABLE_LEVELS == 3
typedef         __u32 pmd_t;
#define pmd_val(x)      (x)
#define __pmd(x)        (x)
#endif

typedef         __u32 pgd_t;
typedef unsigned long pgprot_t;

#define pte_val(x)      (x)
#define pgd_val(x)      (x)
#define pgprot_val(x)   (x)

#define __pte(x)        (x)
#define __pgd(x)        (x)
#define __pgprot(x)     (x)

#endif /* STRICT_MM_TYPECHECKS */

#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
#if CONFIG_PGTABLE_LEVELS == 3
#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
#endif

typedef struct page *pgtable_t;

typedef struct __physmem_range {
        unsigned long start_pfn;
        unsigned long pages;       /* PAGE_SIZE pages */
} physmem_range_t;

extern physmem_range_t pmem_ranges[];
extern int npmem_ranges;

#endif /* !__ASSEMBLER__ */

/* WARNING: The definitions below must match exactly to sizeof(pte_t)
 * etc
 */
#ifdef CONFIG_64BIT
#define BITS_PER_PTE_ENTRY      3
#define BITS_PER_PMD_ENTRY      2
#define BITS_PER_PGD_ENTRY      2
#else
#define BITS_PER_PTE_ENTRY      2
#define BITS_PER_PMD_ENTRY      2
#define BITS_PER_PGD_ENTRY      2
#endif
#define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
#define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
#define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)

#define LINUX_GATEWAY_SPACE     0

/* This governs the relationship between virtual and physical addresses.
 * If you alter it, make sure to take care of our various fixed mapping
 * segments in fixmap.h */
#ifdef CONFIG_64BIT
#define __PAGE_OFFSET_DEFAULT   (0x40000000)    /* 1GB */
#else
#define __PAGE_OFFSET_DEFAULT   (0x10000000)    /* 256MB */
#endif

#if defined(BOOTLOADER)
#define __PAGE_OFFSET   (0)     /* bootloader uses physical addresses */
#else
#define __PAGE_OFFSET   __PAGE_OFFSET_DEFAULT
#endif /* BOOTLOADER */

#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)

/* The size of the gateway page (we leave lots of room for expansion) */
#define GATEWAY_PAGE_SIZE       0x4000

/* The start of the actual kernel binary---used in vmlinux.lds.S
 * Leave some space after __PAGE_OFFSET for detecting kernel null
 * ptr derefs */
#define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)

/* These macros don't work for 64-bit C code -- don't allow in C at all */
#ifdef __ASSEMBLER__
#   define PA(x)        ((x)-__PAGE_OFFSET)
#   define VA(x)        ((x)+__PAGE_OFFSET)
#endif
#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))

#ifdef CONFIG_HUGETLB_PAGE
#define HPAGE_SHIFT             PMD_SHIFT /* fixed for transparent huge pages */
#define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
#define HPAGE_MASK              (~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)

#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
# define REAL_HPAGE_SHIFT       20 /* 20 = 1MB */
# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
# define REAL_HPAGE_SHIFT       22 /* 22 = 4MB */
# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
#else
# define REAL_HPAGE_SHIFT       24 /* 24 = 16MB */
# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
#endif
#endif /* CONFIG_HUGETLB_PAGE */

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

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

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>
#include <asm/pdc.h>

#define PAGE0   ((struct zeropage *)absolute_pointer(__PAGE_OFFSET))

/* DEFINITION OF THE ZERO-PAGE (PAG0) */
/* based on work by Jason Eckhardt (jason@equator.com) */

#endif /* _PARISC_PAGE_H */