text: /* SPDX-License-Identifier: GPL-2.0 */
  /*
   * page.h:  Various defines and such for MMU operations on the Sparc for
   *          the Linux kernel.
   *
   * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   */
  
  #ifndef _SPARC_PAGE_H
  #define _SPARC_PAGE_H
  
  #include <linux/const.h>
  
  #define PAGE_SHIFT   12
  #define PAGE_SIZE    (_AC(1, UL) << PAGE_SHIFT)
  #define PAGE_MASK    (~(PAGE_SIZE-1))
  
  #ifndef __ASSEMBLY__
  
  #define clear_page(page)	 memset((void *)(page), 0, PAGE_SIZE)
  #define copy_page(to,from) 	memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  #define clear_user_page(addr, vaddr, page)	\
  	do { 	clear_page(addr);		\
  		sparc_flush_page_to_ram(page);	\
  	} while (0)
  #define copy_user_page(to, from, vaddr, page)	\
  	do {	copy_page(to, from);		\
  		sparc_flush_page_to_ram(page);	\
  	} while (0)
  
  /* The following structure is used to hold the physical
   * memory configuration of the machine.  This is filled in
   * prom_meminit() and is later used by mem_init() to set up
   * mem_map[].  We statically allocate SPARC_PHYS_BANKS+1 of
   * these structs, this is arbitrary.  The entry after the
   * last valid one has num_bytes==0.
   */
  struct sparc_phys_banks {
    unsigned long base_addr;
    unsigned long num_bytes;
  };
  
  #define SPARC_PHYS_BANKS 32
  
  extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
  
  /* passing structs on the Sparc slow us down tremendously... */
  
  /* #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 pmdv[16]; } pmd_t;
  typedef struct { unsigned long pgd; } pgd_t;
  typedef struct { unsigned long ctxd; } ctxd_t;
  typedef struct { unsigned long pgprot; } pgprot_t;
  typedef struct { unsigned long iopgprot; } iopgprot_t;
  
  #define pte_val(x)	((x).pte)
  #define iopte_val(x)	((x).iopte)
  #define pmd_val(x)      ((x).pmdv[0])
  #define pgd_val(x)	((x).pgd)
  #define ctxd_val(x)	((x).ctxd)
  #define pgprot_val(x)	((x).pgprot)
  #define iopgprot_val(x)	((x).iopgprot)
  
  #define __pte(x)	((pte_t) { (x) } )
  #define __pmd(x)	((pmd_t) { { (x) }, })
  #define __iopte(x)	((iopte_t) { (x) } )
  #define __pgd(x)	((pgd_t) { (x) } )
  #define __ctxd(x)	((ctxd_t) { (x) } )
  #define __pgprot(x)	((pgprot_t) { (x) } )
  #define __iopgprot(x)	((iopgprot_t) { (x) } )
  
  #else
  /*
   * .. while these make it easier on the compiler
   */
  typedef unsigned long pte_t;
  typedef unsigned long iopte_t;
  typedef struct { unsigned long pmdv[16]; } pmd_t;
  typedef unsigned long pgd_t;
  typedef unsigned long ctxd_t;
  typedef unsigned long pgprot_t;
  typedef unsigned long iopgprot_t;
  
  #define pte_val(x)	(x)
  #define iopte_val(x)	(x)
  #define pmd_val(x)      ((x).pmdv[0])
  #define pgd_val(x)	(x)
  #define ctxd_val(x)	(x)
  #define pgprot_val(x)	(x)
  #define iopgprot_val(x)	(x)
  
  #define __pte(x)	(x)
  #define __pmd(x)	((pmd_t) { { (x) }, })
  #define __iopte(x)	(x)
  #define __pgd(x)	(x)
  #define __ctxd(x)	(x)
  #define __pgprot(x)	(x)
  #define __iopgprot(x)	(x)
  
  #endif
  
  typedef struct page *pgtable_t;
  
  #define TASK_UNMAPPED_BASE	0x50000000
  
  #else /* !(__ASSEMBLY__) */
  
  #define __pgprot(x)	(x)
  
  #endif /* !(__ASSEMBLY__) */
  
  #define PAGE_OFFSET	0xf0000000
  #ifndef __ASSEMBLY__
  extern unsigned long phys_base;
  extern unsigned long pfn_base;
  #endif
  #define __pa(x)			((unsigned long)(x) - PAGE_OFFSET + phys_base)
  #define __va(x)			((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
  
  #define virt_to_phys		__pa
  #define phys_to_virt		__va
  
  #define ARCH_PFN_OFFSET		(pfn_base)
  #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  
  #define pfn_valid(pfn)		(((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
  #define virt_addr_valid(kaddr)	((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
  
  #define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
  				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  
  #include <asm-generic/memory_model.h>
  #include <asm-generic/getorder.h>
  
  #endif /* _SPARC_PAGE_H */
  