/* $Id: pgtable.h,v 1.110 2001/12/21 04:56:17 davem Exp $ */#ifndef _SPARC_PGTABLE_H#define _SPARC_PGTABLE_H /*  asm-sparc/pgtable.h:  Defines and functions used to work *                        with Sparc page tables. * *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include <asm-generic/4level-fixup.h> #include <linux/spinlock.h>#include <linux/swap.h>#include <asm/types.h>#ifdef CONFIG_SUN4#include <asm/pgtsun4.h>#else#include <asm/pgtsun4c.h>#endif#include <asm/pgtsrmmu.h>#include <asm/vac-ops.h>#include <asm/oplib.h>#include <asm/btfixup.h>#include <asm/system.h> #ifndef __ASSEMBLY__ struct vm_area_struct;struct page; extern void load_mmu(void);extern unsigned long calc_highpages(void); BTFIXUPDEF_SIMM13(pgdir_shift)BTFIXUPDEF_SETHI(pgdir_size)BTFIXUPDEF_SETHI(pgdir_mask) BTFIXUPDEF_SIMM13(ptrs_per_pmd)BTFIXUPDEF_SIMM13(ptrs_per_pgd)BTFIXUPDEF_SIMM13(user_ptrs_per_pgd) #define pte_ERROR(e)   __builtin_trap()#define pmd_ERROR(e)   __builtin_trap()#define pgd_ERROR(e)   __builtin_trap() BTFIXUPDEF_INT(page_none)BTFIXUPDEF_INT(page_shared)BTFIXUPDEF_INT(page_copy)BTFIXUPDEF_INT(page_readonly)BTFIXUPDEF_INT(page_kernel) #define PMD_SHIFT		SUN4C_PMD_SHIFT#define PMD_SIZE        	(1UL << PMD_SHIFT)#define PMD_MASK        	(~(PMD_SIZE-1))#define PMD_ALIGN(__addr) 	(((__addr) + ~PMD_MASK) & PMD_MASK)#define PGDIR_SHIFT     	BTFIXUP_SIMM13(pgdir_shift)#define PGDIR_SIZE      	BTFIXUP_SETHI(pgdir_size)#define PGDIR_MASK      	BTFIXUP_SETHI(pgdir_mask)#define PTRS_PER_PTE    	1024#define PTRS_PER_PMD    	BTFIXUP_SIMM13(ptrs_per_pmd)#define PTRS_PER_PGD    	BTFIXUP_SIMM13(ptrs_per_pgd)#define USER_PTRS_PER_PGD	BTFIXUP_SIMM13(user_ptrs_per_pgd)#define FIRST_USER_ADDRESS	0#define PTE_SIZE		(PTRS_PER_PTE*4) #define PAGE_NONE      __pgprot(BTFIXUP_INT(page_none))#define PAGE_SHARED    __pgprot(BTFIXUP_INT(page_shared))#define PAGE_COPY      __pgprot(BTFIXUP_INT(page_copy))#define PAGE_READONLY  __pgprot(BTFIXUP_INT(page_readonly)) extern unsigned long page_kernel; #ifdef MODULE#define PAGE_KERNEL	page_kernel#else#define PAGE_KERNEL    __pgprot(BTFIXUP_INT(page_kernel))#endif /* Top-level page directory */extern pgd_t swapper_pg_dir[1024]; extern void paging_init(void); /* Page table for 0-4MB for everybody, on the Sparc this * holds the same as on the i386. */extern pte_t pg0[1024];extern pte_t pg1[1024];extern pte_t pg2[1024];extern pte_t pg3[1024]; extern unsigned long ptr_in_current_pgd; /* Here is a trick, since mmap.c need the initializer elements for * protection_map[] to be constant at compile time, I set the following * to all zeros.  I set it to the real values after I link in the * appropriate MMU page table routines at boot time. */#define __P000  __pgprot(0)#define __P001  __pgprot(0)#define __P010  __pgprot(0)#define __P011  __pgprot(0)#define __P100  __pgprot(0)#define __P101  __pgprot(0)#define __P110  __pgprot(0)#define __P111  __pgprot(0) #define __S000	__pgprot(0)#define __S001	__pgprot(0)#define __S010	__pgprot(0)#define __S011	__pgprot(0)#define __S100	__pgprot(0)#define __S101	__pgprot(0)#define __S110	__pgprot(0)#define __S111	__pgprot(0) extern int num_contexts; /* First physical page can be anywhere, the following is needed so that * va-->pa and vice versa conversions work properly without performance * hit for all __pa()/__va() operations. */extern unsigned long phys_base;extern unsigned long pfn_base; /* * BAD_PAGETABLE is used when we need a bogus page-table, while * BAD_PAGE is used for a bogus page. * * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */extern pte_t * __bad_pagetable(void);extern pte_t __bad_page(void);extern unsigned long empty_zero_page; #define BAD_PAGETABLE __bad_pagetable()#define BAD_PAGE __bad_page()#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page)) /* */BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page, pgd_t) #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)#define pgd_page(pgd) BTFIXUP_CALL(pgd_page)(pgd) BTFIXUPDEF_SETHI(none_mask)BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)BTFIXUPDEF_CALL(void, pte_clear, pte_t *)BTFIXUPDEF_CALL(int, pte_read, pte_t) static inline int pte_none(pte_t pte){	return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));} #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)#define pte_read(pte) BTFIXUP_CALL(pte_read)(pte) BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *) static inline int pmd_none(pmd_t pmd){	return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));} #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd) BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *) #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd) /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */BTFIXUPDEF_HALF(pte_writei)BTFIXUPDEF_HALF(pte_dirtyi)BTFIXUPDEF_HALF(pte_youngi) static int pte_write(pte_t pte) __attribute_const__;static inline int pte_write(pte_t pte){	return pte_val(pte) & BTFIXUP_HALF(pte_writei);} static int pte_dirty(pte_t pte) __attribute_const__;static inline int pte_dirty(pte_t pte){	return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);} static int pte_young(pte_t pte) __attribute_const__;static inline int pte_young(pte_t pte){	return pte_val(pte) & BTFIXUP_HALF(pte_youngi);} /* * The following only work if pte_present() is not true. */BTFIXUPDEF_HALF(pte_filei) static int pte_file(pte_t pte) __attribute_const__;static inline int pte_file(pte_t pte){	return pte_val(pte) & BTFIXUP_HALF(pte_filei);} /* */BTFIXUPDEF_HALF(pte_wrprotecti)BTFIXUPDEF_HALF(pte_mkcleani)BTFIXUPDEF_HALF(pte_mkoldi) static pte_t pte_wrprotect(pte_t pte) __attribute_const__;static inline pte_t pte_wrprotect(pte_t pte){	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));} static pte_t pte_mkclean(pte_t pte) __attribute_const__;static inline pte_t pte_mkclean(pte_t pte){	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));} static pte_t pte_mkold(pte_t pte) __attribute_const__;static inline pte_t pte_mkold(pte_t pte){	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));} BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t) #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte) #define pfn_pte(pfn, prot)		mk_pte(pfn_to_page(pfn), prot) BTFIXUPDEF_CALL(unsigned long,	 pte_pfn, pte_t)#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)#define pte_page(pte)	pfn_to_page(pte_pfn(pte)) /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t) BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t) #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space) #define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot) BTFIXUPDEF_INT(pte_modify_mask) static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;static inline pte_t pte_modify(pte_t pte, pgprot_t newprot){	return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |		pgprot_val(newprot));} #define pgd_index(address) ((address) >> PGDIR_SHIFT) /* to find an entry in a page-table-directory */#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) /* to find an entry in a kernel page-table-directory */#define pgd_offset_k(address) pgd_offset(&init_mm, address) /* Find an entry in the second-level page table.. */BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr) /* Find an entry in the third-level page table.. */ BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr) /* * This shortcut works on sun4m (and sun4d) because the nocache area is static, * and sun4c is guaranteed to have no highmem anyway. */#define pte_offset_map(d, a)		pte_offset_kernel(d,a)#define pte_offset_map_nested(d, a)	pte_offset_kernel(d,a) #define pte_unmap(pte)		do{}while(0)#define pte_unmap_nested(pte)	do{}while(0) /* Certain architectures need to do special things when pte's * within a page table are directly modified.  Thus, the following * hook is made available. */ BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t) #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) struct seq_file;BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *) #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p) /* Fault handler stuff... */#define FAULT_CODE_PROT     0x1#define FAULT_CODE_WRITE    0x2#define FAULT_CODE_USER     0x4 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t) #define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte) BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,    unsigned long, unsigned int)BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len) extern int invalid_segment; /* Encode and de-code a swap entry */BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long) #define __swp_type(__x)			BTFIXUP_CALL(__swp_type)(__x)#define __swp_offset(__x)		BTFIXUP_CALL(__swp_offset)(__x)#define __swp_entry(__type,__off)	BTFIXUP_CALL(__swp_entry)(__type,__off) #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })#define __swp_entry_to_pte(x)		((pte_t) { (x).val }) /* file-offset-in-pte helpers */BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff); #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off) /* * This is made a constant because mm/fremap.c required a constant. * Note that layout of these bits is different between sun4c.c and srmmu.c. */#define PTE_FILE_MAX_BITS 24 /* */struct ctx_list {	struct ctx_list *next;	struct ctx_list *prev;	unsigned int ctx_number;	struct mm_struct *ctx_mm;}; extern struct ctx_list *ctx_list_pool;  /* Dynamically allocated */extern struct ctx_list ctx_free;        /* Head of free list */extern struct ctx_list ctx_used;        /* Head of used contexts list */ #define NO_CONTEXT     -1 static inline void remove_from_ctx_list(struct ctx_list *entry){	entry->next->prev = entry->prev;	entry->prev->next = entry->next;} static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry){	entry->next = head;	(entry->prev = head->prev)->next = entry;	head->prev = entry;}#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry) static inline unsigned long__get_phys (unsigned long addr){	switch (sparc_cpu_model){	case sun4:	case sun4c:		return sun4c_get_pte (addr) << PAGE_SHIFT;	case sun4m:	case sun4d:		return ((srmmu_get_pte (addr) & 0xffffff00) << 4);	default:		return 0;	}} static inline int__get_iospace (unsigned long addr){	switch (sparc_cpu_model){	case sun4:	case sun4c:		return -1; /* Don't check iospace on sun4c */	case sun4m:	case sun4d:		return (srmmu_get_pte (addr) >> 28);	default:		return -1;	}} extern unsigned long *sparc_valid_addr_bitmap; /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */#define kern_addr_valid(addr) \	(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap)) extern int io_remap_pfn_range(struct vm_area_struct *vma,			      unsigned long from, unsigned long pfn,			      unsigned long size, pgprot_t prot); /* * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in * its high 4 bits.  These macros/functions put it there or get it from there. */#define MK_IOSPACE_PFN(space, pfn)	(pfn | (space << (BITS_PER_LONG - 4)))#define GET_IOSPACE(pfn)		(pfn >> (BITS_PER_LONG - 4))#define GET_PFN(pfn)			(pfn & 0x0fffffffUL) #include <asm-generic/pgtable.h> #endif /* !(__ASSEMBLY__) */ /* We provide our own get_unmapped_area to cope with VA holes for userland */#define HAVE_ARCH_UNMAPPED_AREA /* * No page table caches to initialise */#define pgtable_cache_init()	do { } while (0) #endif /* !(_SPARC_PGTABLE_H) */