/* $Id: page.h,v 1.54 2000/08/10 01:04:53 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 #ifdef CONFIG_SUN4 #define PAGE_SHIFT 13 #else #define PAGE_SHIFT 12 #endif #ifndef __ASSEMBLY__ /* I have my suspicions... -DaveM */ #define PAGE_SIZE (1UL << PAGE_SHIFT) #else #define PAGE_SIZE (1 << PAGE_SHIFT) #endif #define PAGE_MASK (~(PAGE_SIZE-1)) #ifdef __KERNEL__ #include /* for KERNBASE */ #include /* This is always 2048*sizeof(long), doesn't change with PAGE_SIZE */ #define TASK_UNION_SIZE 8192 #ifndef __ASSEMBLY__ /* * XXX I am hitting compiler bugs with __builtin_trap. This has * hit me before and rusty was blaming his netfilter bugs on * this so lets disable it. - Anton */ #if 0 /* #if (__GNUC__ > 2) || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8) */ /* We need the mb()'s so we don't trigger a compiler bug - Anton */ #define BUG() do { \ mb(); \ __builtin_trap(); \ mb(); \ } while(0) #else #define BUG() do { \ printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; \ } while (0) #endif #define PAGE_BUG(page) BUG() #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(page, vaddr) clear_page(page) #define copy_user_page(to, from, vaddr) copy_page(to, from) /* 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 extern unsigned long sparc_unmapped_base; BTFIXUPDEF_SETHI(sparc_unmapped_base) #define TASK_UNMAPPED_BASE BTFIXUP_SETHI(sparc_unmapped_base) /* Pure 2^n version of get_order */ extern __inline__ int get_order(unsigned long size) { int order; size = (size-1) >> (PAGE_SHIFT-1); order = -1; do { size >>= 1; order++; } while (size); return order; } #else /* !(__ASSEMBLY__) */ #define __pgprot(x) (x) #endif /* !(__ASSEMBLY__) */ /* to align the pointer to the (next) page boundary */ #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) #define PAGE_OFFSET 0xf0000000 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET) #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET)) #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT)) #define VALID_PAGE(page) ((page - mem_map) < max_mapnr) #endif /* __KERNEL__ */ #endif /* _SPARC_PAGE_H */