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/* $Id: page.h,v 1.30 1996/10/27 08:55:30 davem Exp $
* 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 <asm/head.h> /* for KERNBASE */
#define PAGE_SHIFT 12
#define PAGE_SIZE (1 << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
extern unsigned long page_offset;
#define PAGE_OFFSET (page_offset)
/* translate between physical and virtual addresses */
extern unsigned long (*mmu_v2p)(unsigned long);
extern unsigned long (*mmu_p2v)(unsigned long);
#define __pa(x) mmu_v2p(x)
#define __va(x) mmu_p2v(x)
/* The following structure is used to hold the physical
* memory configuration of the machine. This is filled in
* probe_memory() and is later used by mem_init() to set up
* mem_map[]. We statically allocate SPARC_PHYS_BANKS 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];
/* Cache alias structure. Entry is valid if context != -1. */
struct cache_palias {
unsigned long vaddr;
int context;
};
extern struct cache_palias *sparc_aliases;
/* 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 pmd; } 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).pmd)
#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 __iopte(x) ((iopte_t) { (x) } )
#define __pmd(x) ((pmd_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 unsigned long 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)
#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 __iopte(x) (x)
#define __pmd(x) (x)
#define __pgd(x) (x)
#define __ctxd(x) (x)
#define __pgprot(x) (x)
#define __iopgprot(x) (x)
#endif
#define copy_page(from,to) memcpy((void *) to, (void *) from, PAGE_SIZE)
extern unsigned long sparc_unmapped_base;
#define TASK_UNMAPPED_BASE (sparc_unmapped_base)
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
/* Now, to allow for very large physical memory configurations we
* place the page pool both above the kernel and below the kernel.
*/
#define MAP_NR(addr) ((((unsigned long) (addr)) - PAGE_OFFSET) >> PAGE_SHIFT)
#endif /* !(__ASSEMBLY__) */
#endif /* __KERNEL__ */
#endif /* _SPARC_PAGE_H */
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