linux/arch/sparc/include/asm/page_32.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * page.h:  Various defines and such for MMU operations on the Sparc for
   4 *          the Linux kernel.
   5 *
   6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   7 */
   8
   9#ifndef _SPARC_PAGE_H
  10#define _SPARC_PAGE_H
  11
  12#include <linux/const.h>
  13
  14#define PAGE_SHIFT   12
  15#define PAGE_SIZE    (_AC(1, UL) << PAGE_SHIFT)
  16#define PAGE_MASK    (~(PAGE_SIZE-1))
  17
  18#ifndef __ASSEMBLY__
  19
  20#define clear_page(page)         memset((void *)(page), 0, PAGE_SIZE)
  21#define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  22#define clear_user_page(addr, vaddr, page)      \
  23        do {    clear_page(addr);               \
  24                sparc_flush_page_to_ram(page);  \
  25        } while (0)
  26#define copy_user_page(to, from, vaddr, page)   \
  27        do {    copy_page(to, from);            \
  28                sparc_flush_page_to_ram(page);  \
  29        } while (0)
  30
  31/* The following structure is used to hold the physical
  32 * memory configuration of the machine.  This is filled in
  33 * prom_meminit() and is later used by mem_init() to set up
  34 * mem_map[].  We statically allocate SPARC_PHYS_BANKS+1 of
  35 * these structs, this is arbitrary.  The entry after the
  36 * last valid one has num_bytes==0.
  37 */
  38struct sparc_phys_banks {
  39  unsigned long base_addr;
  40  unsigned long num_bytes;
  41};
  42
  43#define SPARC_PHYS_BANKS 32
  44
  45extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
  46
  47/* passing structs on the Sparc slow us down tremendously... */
  48
  49/* #define STRICT_MM_TYPECHECKS */
  50
  51#ifdef STRICT_MM_TYPECHECKS
  52/*
  53 * These are used to make use of C type-checking..
  54 */
  55typedef struct { unsigned long pte; } pte_t;
  56typedef struct { unsigned long iopte; } iopte_t;
  57typedef struct { unsigned long pmd; } pmd_t;
  58typedef struct { unsigned long pgd; } pgd_t;
  59typedef struct { unsigned long ctxd; } ctxd_t;
  60typedef struct { unsigned long pgprot; } pgprot_t;
  61typedef struct { unsigned long iopgprot; } iopgprot_t;
  62
  63#define pte_val(x)      ((x).pte)
  64#define iopte_val(x)    ((x).iopte)
  65#define pmd_val(x)      ((x).pmd)
  66#define pgd_val(x)      ((x).pgd)
  67#define ctxd_val(x)     ((x).ctxd)
  68#define pgprot_val(x)   ((x).pgprot)
  69#define iopgprot_val(x) ((x).iopgprot)
  70
  71#define __pte(x)        ((pte_t) { (x) } )
  72#define __pmd(x)        ((pmd_t) { { (x) }, })
  73#define __iopte(x)      ((iopte_t) { (x) } )
  74#define __pgd(x)        ((pgd_t) { (x) } )
  75#define __ctxd(x)       ((ctxd_t) { (x) } )
  76#define __pgprot(x)     ((pgprot_t) { (x) } )
  77#define __iopgprot(x)   ((iopgprot_t) { (x) } )
  78
  79#else
  80/*
  81 * .. while these make it easier on the compiler
  82 */
  83typedef unsigned long pte_t;
  84typedef unsigned long iopte_t;
  85typedef unsigned long pmd_t;
  86typedef unsigned long pgd_t;
  87typedef unsigned long ctxd_t;
  88typedef unsigned long pgprot_t;
  89typedef unsigned long iopgprot_t;
  90
  91#define pte_val(x)      (x)
  92#define iopte_val(x)    (x)
  93#define pmd_val(x)      (x)
  94#define pgd_val(x)      (x)
  95#define ctxd_val(x)     (x)
  96#define pgprot_val(x)   (x)
  97#define iopgprot_val(x) (x)
  98
  99#define __pte(x)        (x)
 100#define __pmd(x)        (x)
 101#define __iopte(x)      (x)
 102#define __pgd(x)        (x)
 103#define __ctxd(x)       (x)
 104#define __pgprot(x)     (x)
 105#define __iopgprot(x)   (x)
 106
 107#endif
 108
 109typedef pte_t *pgtable_t;
 110
 111#define TASK_UNMAPPED_BASE      0x50000000
 112
 113#else /* !(__ASSEMBLY__) */
 114
 115#define __pgprot(x)     (x)
 116
 117#endif /* !(__ASSEMBLY__) */
 118
 119#define PAGE_OFFSET     0xf0000000
 120#ifndef __ASSEMBLY__
 121extern unsigned long phys_base;
 122extern unsigned long pfn_base;
 123#endif
 124#define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET + phys_base)
 125#define __va(x)                 ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
 126
 127#define virt_to_phys            __pa
 128#define phys_to_virt            __va
 129
 130#define ARCH_PFN_OFFSET         (pfn_base)
 131#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 132
 133#define pfn_valid(pfn)          (((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
 134#define virt_addr_valid(kaddr)  ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
 135
 136#include <asm-generic/memory_model.h>
 137#include <asm-generic/getorder.h>
 138
 139#endif /* _SPARC_PAGE_H */
 140
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