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linux/include/asm-ppc64/pgtable.h
David Gibson 20cee16ced [PATCH] ppc64: Abolish ioremap_mm 
Currently ppc64 has two mm_structs for the kernel, init_mm and also
ioremap_mm.  The latter really isn't necessary: this patch abolishes it,
instead restricting vmallocs to the lower 1TB of the init_mm's range and
placing io mappings in the upper 1TB.  This simplifies the code in a number
of places and eliminates an unecessary set of pagetables.  It also tweaks
the unmap/free path a little, allowing us to remove the unmap_im_area() set
of page table walkers, replacing them with unmap_vm_area().

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-21 18:46:26 -07:00

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#ifndef _PPC64_PGTABLE_H
#define _PPC64_PGTABLE_H
/*
* This file contains the functions and defines necessary to modify and use
* the ppc64 hashed page table.
*/
#ifndef __ASSEMBLY__
#include <linux/config.h>
#include <linux/stddef.h>
#include <asm/processor.h> /* For TASK_SIZE */
#include <asm/mmu.h>
#include <asm/page.h>
#include <asm/tlbflush.h>
#endif /* __ASSEMBLY__ */
#include <asm-generic/pgtable-nopud.h>
/*
* Entries per page directory level. The PTE level must use a 64b record
* for each page table entry. The PMD and PGD level use a 32b record for
* each entry by assuming that each entry is page aligned.
*/
#define PTE_INDEX_SIZE 9
#define PMD_INDEX_SIZE 10
#define PGD_INDEX_SIZE 10
#define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
#define PTRS_PER_PMD (1 << PMD_INDEX_SIZE)
#define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
/* PMD_SHIFT determines what a second-level page table entry can map */
#define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE)
#define PMD_SIZE (1UL << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE-1))
/* PGDIR_SHIFT determines what a third-level page table entry can map */
#define PGDIR_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE)
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define FIRST_USER_ADDRESS 0
/*
* Size of EA range mapped by our pagetables.
*/
#define EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
PGD_INDEX_SIZE + PAGE_SHIFT)
#define EADDR_MASK ((1UL << EADDR_SIZE) - 1)
/*
* Define the address range of the vmalloc VM area.
*/
#define VMALLOC_START (0xD000000000000000ul)
#define VMALLOC_SIZE (0x10000000000UL)
#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
/*
* Bits in a linux-style PTE. These match the bits in the
* (hardware-defined) PowerPC PTE as closely as possible.
*/
#define _PAGE_PRESENT 0x0001 /* software: pte contains a translation */
#define _PAGE_USER 0x0002 /* matches one of the PP bits */
#define _PAGE_FILE 0x0002 /* (!present only) software: pte holds file offset */
#define _PAGE_EXEC 0x0004 /* No execute on POWER4 and newer (we invert) */
#define _PAGE_GUARDED 0x0008
#define _PAGE_COHERENT 0x0010 /* M: enforce memory coherence (SMP systems) */
#define _PAGE_NO_CACHE 0x0020 /* I: cache inhibit */
#define _PAGE_WRITETHRU 0x0040 /* W: cache write-through */
#define _PAGE_DIRTY 0x0080 /* C: page changed */
#define _PAGE_ACCESSED 0x0100 /* R: page referenced */
#define _PAGE_RW 0x0200 /* software: user write access allowed */
#define _PAGE_HASHPTE 0x0400 /* software: pte has an associated HPTE */
#define _PAGE_BUSY 0x0800 /* software: PTE & hash are busy */
#define _PAGE_SECONDARY 0x8000 /* software: HPTE is in secondary group */
#define _PAGE_GROUP_IX 0x7000 /* software: HPTE index within group */
#define _PAGE_HUGE 0x10000 /* 16MB page */
/* Bits 0x7000 identify the index within an HPT Group */
#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | _PAGE_SECONDARY | _PAGE_GROUP_IX)
/* PAGE_MASK gives the right answer below, but only by accident */
/* It should be preserving the high 48 bits and then specifically */
/* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */
#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_HPTEFLAGS)
#define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_COHERENT)
#define _PAGE_WRENABLE (_PAGE_RW | _PAGE_DIRTY)
/* __pgprot defined in asm-ppc64/page.h */
#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER)
#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER | _PAGE_EXEC)
#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER)
#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
#define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_WRENABLE)
#define PAGE_KERNEL_CI __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
_PAGE_WRENABLE | _PAGE_NO_CACHE | _PAGE_GUARDED)
#define PAGE_KERNEL_EXEC __pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_EXEC)
#define PAGE_AGP __pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_NO_CACHE)
#define HAVE_PAGE_AGP
/*
* This bit in a hardware PTE indicates that the page is *not* executable.
*/
#define HW_NO_EXEC _PAGE_EXEC
/*
* POWER4 and newer have per page execute protection, older chips can only
* do this on a segment (256MB) basis.
*
* Also, write permissions imply read permissions.
* This is the closest we can get..
*
* Note due to the way vm flags are laid out, the bits are XWR
*/
#define __P000 PAGE_NONE
#define __P001 PAGE_READONLY
#define __P010 PAGE_COPY
#define __P011 PAGE_COPY
#define __P100 PAGE_READONLY_X
#define __P101 PAGE_READONLY_X
#define __P110 PAGE_COPY_X
#define __P111 PAGE_COPY_X
#define __S000 PAGE_NONE
#define __S001 PAGE_READONLY
#define __S010 PAGE_SHARED
#define __S011 PAGE_SHARED
#define __S100 PAGE_READONLY_X
#define __S101 PAGE_READONLY_X
#define __S110 PAGE_SHARED_X
#define __S111 PAGE_SHARED_X
#ifndef __ASSEMBLY__
/*
* ZERO_PAGE is a global shared page that is always zero: used
* for zero-mapped memory areas etc..
*/
extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
#endif /* __ASSEMBLY__ */
/* shift to put page number into pte */
#define PTE_SHIFT (17)
#ifdef CONFIG_HUGETLB_PAGE
#ifndef __ASSEMBLY__
int hash_huge_page(struct mm_struct *mm, unsigned long access,
unsigned long ea, unsigned long vsid, int local);
void hugetlb_mm_free_pgd(struct mm_struct *mm);
#endif /* __ASSEMBLY__ */
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
#else
#define hash_huge_page(mm,a,ea,vsid,local) -1
#define hugetlb_mm_free_pgd(mm) do {} while (0)
#endif
#ifndef __ASSEMBLY__
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*
* mk_pte takes a (struct page *) as input
*/
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
{
pte_t pte;
pte_val(pte) = (pfn << PTE_SHIFT) | pgprot_val(pgprot);
return pte;
}
#define pte_modify(_pte, newprot) \
(__pte((pte_val(_pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)))
#define pte_none(pte) ((pte_val(pte) & ~_PAGE_HPTEFLAGS) == 0)
#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
/* pte_clear moved to later in this file */
#define pte_pfn(x) ((unsigned long)((pte_val(x) >> PTE_SHIFT)))
#define pte_page(x) pfn_to_page(pte_pfn(x))
#define pmd_set(pmdp, ptep) \
(pmd_val(*(pmdp)) = __ba_to_bpn(ptep))
#define pmd_none(pmd) (!pmd_val(pmd))
#define pmd_bad(pmd) (pmd_val(pmd) == 0)
#define pmd_present(pmd) (pmd_val(pmd) != 0)
#define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0)
#define pmd_page_kernel(pmd) (__bpn_to_ba(pmd_val(pmd)))
#define pmd_page(pmd) virt_to_page(pmd_page_kernel(pmd))
#define pud_set(pudp, pmdp) (pud_val(*(pudp)) = (__ba_to_bpn(pmdp)))
#define pud_none(pud) (!pud_val(pud))
#define pud_bad(pud) ((pud_val(pud)) == 0UL)
#define pud_present(pud) (pud_val(pud) != 0UL)
#define pud_clear(pudp) (pud_val(*(pudp)) = 0UL)
#define pud_page(pud) (__bpn_to_ba(pud_val(pud)))
/*
* Find an entry in a page-table-directory. We combine the address region
* (the high order N bits) and the pgd portion of the address.
*/
/* to avoid overflow in free_pgtables we don't use PTRS_PER_PGD here */
#define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & 0x7ff)
#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
/* Find an entry in the second-level page table.. */
#define pmd_offset(pudp,addr) \
((pmd_t *) pud_page(*(pudp)) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
/* Find an entry in the third-level page table.. */
#define pte_offset_kernel(dir,addr) \
((pte_t *) pmd_page_kernel(*(dir)) \
+ (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
#define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
#define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
#define pte_unmap(pte) do { } while(0)
#define pte_unmap_nested(pte) do { } while(0)
/* to find an entry in a kernel page-table-directory */
/* This now only contains the vmalloc pages */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER;}
static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW;}
static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC;}
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY;}
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED;}
static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE;}
static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE;}
static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; }
static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; }
static inline pte_t pte_rdprotect(pte_t pte) {
pte_val(pte) &= ~_PAGE_USER; return pte; }
static inline pte_t pte_exprotect(pte_t pte) {
pte_val(pte) &= ~_PAGE_EXEC; return pte; }
static inline pte_t pte_wrprotect(pte_t pte) {
pte_val(pte) &= ~(_PAGE_RW); return pte; }
static inline pte_t pte_mkclean(pte_t pte) {
pte_val(pte) &= ~(_PAGE_DIRTY); return pte; }
static inline pte_t pte_mkold(pte_t pte) {
pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkread(pte_t pte) {
pte_val(pte) |= _PAGE_USER; return pte; }
static inline pte_t pte_mkexec(pte_t pte) {
pte_val(pte) |= _PAGE_USER | _PAGE_EXEC; return pte; }
static inline pte_t pte_mkwrite(pte_t pte) {
pte_val(pte) |= _PAGE_RW; return pte; }
static inline pte_t pte_mkdirty(pte_t pte) {
pte_val(pte) |= _PAGE_DIRTY; return pte; }
static inline pte_t pte_mkyoung(pte_t pte) {
pte_val(pte) |= _PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkhuge(pte_t pte) {
pte_val(pte) |= _PAGE_HUGE; return pte; }
/* Atomic PTE updates */
static inline unsigned long pte_update(pte_t *p, unsigned long clr)
{
unsigned long old, tmp;
__asm__ __volatile__(
"1: ldarx %0,0,%3 # pte_update\n\
andi. %1,%0,%6\n\
bne- 1b \n\
andc %1,%0,%4 \n\
stdcx. %1,0,%3 \n\
bne- 1b"
: "=&r" (old), "=&r" (tmp), "=m" (*p)
: "r" (p), "r" (clr), "m" (*p), "i" (_PAGE_BUSY)
: "cc" );
return old;
}
/* PTE updating functions, this function puts the PTE in the
* batch, doesn't actually triggers the hash flush immediately,
* you need to call flush_tlb_pending() to do that.
*/
extern void hpte_update(struct mm_struct *mm, unsigned long addr, unsigned long pte,
int wrprot);
static inline int __ptep_test_and_clear_young(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
unsigned long old;
if ((pte_val(*ptep) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0)
return 0;
old = pte_update(ptep, _PAGE_ACCESSED);
if (old & _PAGE_HASHPTE) {
hpte_update(mm, addr, old, 0);
flush_tlb_pending();
}
return (old & _PAGE_ACCESSED) != 0;
}
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define ptep_test_and_clear_young(__vma, __addr, __ptep) \
({ \
int __r; \
__r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
__r; \
})
/*
* On RW/DIRTY bit transitions we can avoid flushing the hpte. For the
* moment we always flush but we need to fix hpte_update and test if the
* optimisation is worth it.
*/
static inline int __ptep_test_and_clear_dirty(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
unsigned long old;
if ((pte_val(*ptep) & _PAGE_DIRTY) == 0)
return 0;
old = pte_update(ptep, _PAGE_DIRTY);
if (old & _PAGE_HASHPTE)
hpte_update(mm, addr, old, 0);
return (old & _PAGE_DIRTY) != 0;
}
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
#define ptep_test_and_clear_dirty(__vma, __addr, __ptep) \
({ \
int __r; \
__r = __ptep_test_and_clear_dirty((__vma)->vm_mm, __addr, __ptep); \
__r; \
})
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
unsigned long old;
if ((pte_val(*ptep) & _PAGE_RW) == 0)
return;
old = pte_update(ptep, _PAGE_RW);
if (old & _PAGE_HASHPTE)
hpte_update(mm, addr, old, 0);
}
/*
* We currently remove entries from the hashtable regardless of whether
* the entry was young or dirty. The generic routines only flush if the
* entry was young or dirty which is not good enough.
*
* We should be more intelligent about this but for the moment we override
* these functions and force a tlb flush unconditionally
*/
#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
#define ptep_clear_flush_young(__vma, __address, __ptep) \
({ \
int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
__ptep); \
__young; \
})
#define __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
#define ptep_clear_flush_dirty(__vma, __address, __ptep) \
({ \
int __dirty = __ptep_test_and_clear_dirty((__vma)->vm_mm, __address, \
__ptep); \
flush_tlb_page(__vma, __address); \
__dirty; \
})
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
unsigned long old = pte_update(ptep, ~0UL);
if (old & _PAGE_HASHPTE)
hpte_update(mm, addr, old, 0);
return __pte(old);
}
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t * ptep)
{
unsigned long old = pte_update(ptep, ~0UL);
if (old & _PAGE_HASHPTE)
hpte_update(mm, addr, old, 0);
}
/*
* set_pte stores a linux PTE into the linux page table.
*/
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
if (pte_present(*ptep)) {
pte_clear(mm, addr, ptep);
flush_tlb_pending();
}
*ptep = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
}
/* Set the dirty and/or accessed bits atomically in a linux PTE, this
* function doesn't need to flush the hash entry
*/
#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry, int dirty)
{
unsigned long bits = pte_val(entry) &
(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
unsigned long old, tmp;
__asm__ __volatile__(
"1: ldarx %0,0,%4\n\
andi. %1,%0,%6\n\
bne- 1b \n\
or %0,%3,%0\n\
stdcx. %0,0,%4\n\
bne- 1b"
:"=&r" (old), "=&r" (tmp), "=m" (*ptep)
:"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY)
:"cc");
}
#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
do { \
__ptep_set_access_flags(__ptep, __entry, __dirty); \
flush_tlb_page_nohash(__vma, __address); \
} while(0)
/*
* Macro to mark a page protection value as "uncacheable".
*/
#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_NO_CACHE | _PAGE_GUARDED))
struct file;
extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr,
unsigned long size, pgprot_t vma_prot);
#define __HAVE_PHYS_MEM_ACCESS_PROT
#define __HAVE_ARCH_PTE_SAME
#define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
#define pmd_ERROR(e) \
printk("%s:%d: bad pmd %08x.\n", __FILE__, __LINE__, pmd_val(e))
#define pgd_ERROR(e) \
printk("%s:%d: bad pgd %08x.\n", __FILE__, __LINE__, pgd_val(e))
extern pgd_t swapper_pg_dir[];
extern void paging_init(void);
/*
* Because the huge pgtables are only 2 level, they can take
* at most around 4M, much less than one hugepage which the
* process is presumably entitled to use. So we don't bother
* freeing up the pagetables on unmap, and wait until
* destroy_context() to clean up the lot.
*/
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
do { } while (0)
/*
* This gets called at the end of handling a page fault, when
* the kernel has put a new PTE into the page table for the process.
* We use it to put a corresponding HPTE into the hash table
* ahead of time, instead of waiting for the inevitable extra
* hash-table miss exception.
*/
struct vm_area_struct;
extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
/* Encode and de-code a swap entry */
#define __swp_type(entry) (((entry).val >> 1) & 0x3f)
#define __swp_offset(entry) ((entry).val >> 8)
#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> PTE_SHIFT })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val << PTE_SHIFT })
#define pte_to_pgoff(pte) (pte_val(pte) >> PTE_SHIFT)
#define pgoff_to_pte(off) ((pte_t) {((off) << PTE_SHIFT)|_PAGE_FILE})
#define PTE_FILE_MAX_BITS (BITS_PER_LONG - PTE_SHIFT)
/*
* kern_addr_valid is intended to indicate whether an address is a valid
* kernel address. Most 32-bit archs define it as always true (like this)
* but most 64-bit archs actually perform a test. What should we do here?
* The only use is in fs/ncpfs/dir.c
*/
#define kern_addr_valid(addr) (1)
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
remap_pfn_range(vma, vaddr, pfn, size, prot)
void pgtable_cache_init(void);
/*
* find_linux_pte returns the address of a linux pte for a given
* effective address and directory. If not found, it returns zero.
*/
static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea)
{
pgd_t *pg;
pud_t *pu;
pmd_t *pm;
pte_t *pt = NULL;
pte_t pte;
pg = pgdir + pgd_index(ea);
if (!pgd_none(*pg)) {
pu = pud_offset(pg, ea);
if (!pud_none(*pu)) {
pm = pmd_offset(pu, ea);
if (pmd_present(*pm)) {
pt = pte_offset_kernel(pm, ea);
pte = *pt;
if (!pte_present(pte))
pt = NULL;
}
}
}
return pt;
}
#include <asm-generic/pgtable.h>
#endif /* __ASSEMBLY__ */
#endif /* _PPC64_PGTABLE_H */
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