/* $Id: pgtable.h,v 1.46 1996/04/21 11:01:53 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)
*/
#include <linux/mm.h>
#include <asm/asi.h>
#include <asm/pgtsun4c.h>
#include <asm/pgtsrmmu.h>
#include <asm/vac-ops.h>
#include <asm/oplib.h>
#include <asm/sbus.h>
extern void load_mmu(void);
extern int io_remap_page_range(unsigned long from, unsigned long to,
unsigned long size, pgprot_t prot, int space);
extern void (*quick_kernel_fault)(unsigned long);
/* mmu-specific process creation/cloning/etc hooks. */
extern void (*mmu_exit_hook)(void);
extern void (*mmu_flush_hook)(void);
/* translate between physical and virtual addresses */
extern unsigned long (*mmu_v2p)(unsigned long);
extern unsigned long (*mmu_p2v)(unsigned long);
/* Routines for data transfer buffers. */
extern char *(*mmu_lockarea)(char *, unsigned long);
extern void (*mmu_unlockarea)(char *, unsigned long);
/* Routines for getting a dvma scsi buffer. */
struct mmu_sglist {
/* ick, I know... */
char *addr;
char *alt_addr;
unsigned int len;
};
extern char *(*mmu_get_scsi_one)(char *, unsigned long, struct linux_sbus *sbus);
extern void (*mmu_get_scsi_sgl)(struct mmu_sglist *, int, struct linux_sbus *sbus);
extern void (*mmu_release_scsi_one)(char *, unsigned long, struct linux_sbus *sbus);
extern void (*mmu_release_scsi_sgl)(struct mmu_sglist *, int, struct linux_sbus *sbus);
extern unsigned int pmd_shift;
extern unsigned int pmd_size;
extern unsigned int pmd_mask;
extern unsigned int (*pmd_align)(unsigned int);
extern unsigned int pgdir_shift;
extern unsigned int pgdir_size;
extern unsigned int pgdir_mask;
extern unsigned int (*pgdir_align)(unsigned int);
extern unsigned int ptrs_per_pte;
extern unsigned int ptrs_per_pmd;
extern unsigned int ptrs_per_pgd;
extern unsigned int ptrs_per_page;
extern unsigned long (*(vmalloc_start))(void);
#define VMALLOC_VMADDR(x) ((unsigned long)(x))
#define VMALLOC_START vmalloc_start()
extern pgprot_t page_none;
extern pgprot_t page_shared;
extern pgprot_t page_copy;
extern pgprot_t page_readonly;
extern pgprot_t page_kernel;
#define PMD_SHIFT (pmd_shift)
#define PMD_SIZE (pmd_size)
#define PMD_MASK (pmd_mask)
#define PMD_ALIGN (pmd_align)
#define PGDIR_SHIFT (pgdir_shift)
#define PGDIR_SIZE (pgdir_size)
#define PGDIR_MASK (pgdir_mask)
#define PGDIR_ALIGN (pgdir_align)
#define PTRS_PER_PTE (ptrs_per_pte)
#define PTRS_PER_PMD (ptrs_per_pmd)
#define PTRS_PER_PGD (ptrs_per_pgd)
#define PAGE_NONE (page_none)
#define PAGE_SHARED (page_shared)
#define PAGE_COPY (page_copy)
#define PAGE_READONLY (page_readonly)
#define PAGE_KERNEL (page_kernel)
#define PAGE_INVALID (page_invalid)
/* Top-level page directory */
extern pgd_t swapper_pg_dir[1024];
/* Page table for 0-4MB for everybody, on the Sparc this
* holds the same as on the i386.
*/
extern pte_t pg0[1024];
extern unsigned long ptr_in_current_pgd;
/* the no. of pointers that fit on a page: this will go away */
#define PTRS_PER_PAGE (PAGE_SIZE/sizeof(void*))
/* 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;
/*
* 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_page(void);
extern pte_t * __bad_pagetable(void);
extern unsigned long empty_zero_page;
#define BAD_PAGETABLE __bad_pagetable()
#define BAD_PAGE __bad_page()
#define ZERO_PAGE ((unsigned long)(&(empty_zero_page)))
/* number of bits that fit into a memory pointer */
#define BITS_PER_PTR (8*sizeof(unsigned long))
/* to align the pointer to a pointer address */
#define PTR_MASK (~(sizeof(void*)-1))
#define SIZEOF_PTR_LOG2 2
extern unsigned long (*pte_page)(pte_t);
extern unsigned long (*pmd_page)(pmd_t);
extern unsigned long (*pgd_page)(pgd_t);
extern void (*sparc_update_rootmmu_dir)(struct task_struct *, pgd_t *pgdir);
#define SET_PAGE_DIR(tsk,pgdir) sparc_update_rootmmu_dir(tsk, pgdir)
/* to find an entry in a page-table */
#define PAGE_PTR(address) \
((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
extern unsigned long high_memory;
extern int (*pte_none)(pte_t);
extern int (*pte_present)(pte_t);
extern void (*pte_clear)(pte_t *);
extern int (*pmd_none)(pmd_t);
extern int (*pmd_bad)(pmd_t);
extern int (*pmd_present)(pmd_t);
extern void (*pmd_clear)(pmd_t *);
extern int (*pgd_none)(pgd_t);
extern int (*pgd_bad)(pgd_t);
extern int (*pgd_present)(pgd_t);
extern void (*pgd_clear)(pgd_t *);
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
extern int (*pte_write)(pte_t);
extern int (*pte_dirty)(pte_t);
extern int (*pte_young)(pte_t);
extern pte_t (*pte_wrprotect)(pte_t);
extern pte_t (*pte_mkclean)(pte_t);
extern pte_t (*pte_mkold)(pte_t);
extern pte_t (*pte_mkwrite)(pte_t);
extern pte_t (*pte_mkdirty)(pte_t);
extern pte_t (*pte_mkyoung)(pte_t);
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*/
extern pte_t (*mk_pte)(unsigned long, pgprot_t);
extern pte_t (*mk_pte_io)(unsigned long, pgprot_t, int);
extern void (*pgd_set)(pgd_t *, pmd_t *);
extern pte_t (*pte_modify)(pte_t, pgprot_t);
/* to find an entry in a page-table-directory */
extern pgd_t * (*pgd_offset)(struct mm_struct *, unsigned long);
/* Find an entry in the second-level page table.. */
extern pmd_t * (*pmd_offset)(pgd_t *, unsigned long);
/* Find an entry in the third-level page table.. */
extern pte_t * (*pte_offset)(pmd_t *, unsigned long);
/*
* Allocate and free page tables. The xxx_kernel() versions are
* used to allocate a kernel page table - this turns on ASN bits
* if any, and marks the page tables reserved.
*/
extern void (*pte_free_kernel)(pte_t *);
extern pte_t * (*pte_alloc_kernel)(pmd_t *, unsigned long);
/*
* allocating and freeing a pmd is trivial: the 1-entry pmd is
* inside the pgd, so has no extra memory associated with it.
*/
extern void (*pmd_free_kernel)(pmd_t *);
extern pmd_t * (*pmd_alloc_kernel)(pgd_t *, unsigned long);
extern void (*pte_free)(pte_t *);
extern pte_t * (*pte_alloc)(pmd_t *, unsigned long);
/*
* allocating and freeing a pmd is trivial: the 1-entry pmd is
* inside the pgd, so has no extra memory associated with it.
*/
extern void (*pmd_free)(pmd_t *);
extern pmd_t * (*pmd_alloc)(pgd_t *, unsigned long);
extern void (*pgd_free)(pgd_t *);
extern pgd_t * (*pgd_alloc)(void);
/* Fine grained cache/tlb flushing. */
#ifdef __SMP__
extern void (*local_flush_cache_all)(void);
extern void (*local_flush_cache_mm)(struct mm_struct *);
extern void (*local_flush_cache_range)(struct mm_struct *, unsigned long start,
unsigned long end);
extern void (*local_flush_cache_page)(struct vm_area_struct *, unsigned long address);
extern void (*local_flush_tlb_all)(void);
extern void (*local_flush_tlb_mm)(struct mm_struct *);
extern void (*local_flush_tlb_range)(struct mm_struct *, unsigned long start,
unsigned long end);
extern void (*local_flush_tlb_page)(struct vm_area_struct *, unsigned long address);
extern void (*local_flush_page_to_ram)(unsigned long address);
extern void smp_flush_cache_all(void);
extern void smp_flush_cache_mm(struct mm_struct *mm);
extern void smp_flush_cache_range(struct mm_struct *mm,
unsigned long start,
unsigned long end);
extern void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page);
extern void smp_flush_tlb_all(void);
extern void smp_flush_tlb_mm(struct mm_struct *mm);
extern void smp_flush_tlb_range(struct mm_struct *mm,
unsigned long start,
unsigned long end);
extern void smp_flush_tlb_page(struct vm_area_struct *mm, unsigned long page);
extern void smp_flush_page_to_ram(unsigned long page);
#endif
extern void (*flush_cache_all)(void);
extern void (*flush_cache_mm)(struct mm_struct *);
extern void (*flush_cache_range)(struct mm_struct *, unsigned long start,
unsigned long end);
extern void (*flush_cache_page)(struct vm_area_struct *, unsigned long address);
extern void (*flush_tlb_all)(void);
extern void (*flush_tlb_mm)(struct mm_struct *);
extern void (*flush_tlb_range)(struct mm_struct *, unsigned long start, unsigned long end);
extern void (*flush_tlb_page)(struct vm_area_struct *, unsigned long address);
extern void (*flush_page_to_ram)(unsigned long page);
/* The permissions for pgprot_val to make a page mapped on the obio space */
extern unsigned int pg_iobits;
/* MMU context switching. */
extern void (*switch_to_context)(struct task_struct *tsk);
/* Certain architectures need to do special things when pte's
* within a page table are directly modified. Thus, the following
* hook is made available.
*/
#if 0 /* XXX try this soon XXX */
extern void (*set_pte)(struct vm_area_struct *vma, unsigned long address,
pte_t *pteptr, pte_t pteval);
#else
extern void (*set_pte)(pte_t *pteptr, pte_t pteval);
#endif
extern char *(*mmu_info)(void);
/* Fault handler stuff... */
#define FAULT_CODE_PROT 0x1
#define FAULT_CODE_WRITE 0x2
#define FAULT_CODE_USER 0x4
extern void (*update_mmu_cache)(struct vm_area_struct *vma, unsigned long address, pte_t pte);
extern int invalid_segment;
#define SWP_TYPE(entry) (((entry)>>2) & 0x7f)
#define SWP_OFFSET(entry) (((entry) >> 9) & 0x7ffff)
#define SWP_ENTRY(type,offset) (((type) << 2) | ((offset) << 9))
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
extern inline void remove_from_ctx_list(struct ctx_list *entry)
{
entry->next->prev = entry->prev;
entry->prev->next = entry->next;
}
extern 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)
#endif /* !(_SPARC_PGTABLE_H) */
