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linux-next/arch/sparc/include/asm/pgtable_64.h
David S. Miller d8ed1d43e1 sparc64: Validate linear D-TLB misses. 
When page alloc debugging is not enabled, we essentially accept any
virtual address for linear kernel TLB misses.  But with kgdb, kernel
address probing, and other facilities we can try to access arbitrary
crap.

So, make sure the address we miss on will translate to physical memory
that actually exists.

In order to make this work we have to embed the valid address bitmap
into the kernel image.  And in order to make that less expensive we
make an adjustment, in that the max physical memory address is
decreased to "1 << 41", even on the chips that support a 42-bit
physical address space.  We can do this because bit 41 indicates
"I/O space" and thus covers non-memory ranges.

The result of this is that:

1) kpte_linear_bitmap shrinks from 2K to 1K in size

2) we need 64K more for the valid address bitmap

We can't let the valid address bitmap be dynamically allocated
once we start using it to validate TLB misses, otherwise we have
crazy issues to deal with wrt. recursive TLB misses and such.

If we're in a TLB miss it could be the deepest trap level that's legal
inside of the cpu.  So if we TLB miss referencing the bitmap, the cpu
will be out of trap levels and enter RED state.

To guard against out-of-range accesses to the bitmap, we have to check
to make sure no bits in the physical address above bit 40 are set.  We
could export and use last_valid_pfn for this check, but that's just an
unnecessary extra memory reference.

On the plus side of all this, since we load all of these translations
into the special 4MB mapping TSB, and we check the TSB first for TLB
misses, there should be absolutely no real cost for these new checks
in the TLB miss path.

Reported-by: heyongli@gmail.com
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-08-25 16:47:46 -07:00

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/*
* pgtable.h: SpitFire page table operations.
*
* Copyright 1996,1997 David S. Miller (davem@caip.rutgers.edu)
* Copyright 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#ifndef _SPARC64_PGTABLE_H
#define _SPARC64_PGTABLE_H
/* This file contains the functions and defines necessary to modify and use
* the SpitFire page tables.
*/
#include <asm-generic/pgtable-nopud.h>
#include <linux/compiler.h>
#include <linux/const.h>
#include <asm/types.h>
#include <asm/spitfire.h>
#include <asm/asi.h>
#include <asm/system.h>
#include <asm/page.h>
#include <asm/processor.h>
/* The kernel image occupies 0x4000000 to 0x6000000 (4MB --> 96MB).
* The page copy blockops can use 0x6000000 to 0x8000000.
* The TSB is mapped in the 0x8000000 to 0xa000000 range.
* The PROM resides in an area spanning 0xf0000000 to 0x100000000.
* The vmalloc area spans 0x100000000 to 0x200000000.
* Since modules need to be in the lowest 32-bits of the address space,
* we place them right before the OBP area from 0x10000000 to 0xf0000000.
* There is a single static kernel PMD which maps from 0x0 to address
* 0x400000000.
*/
#define TLBTEMP_BASE _AC(0x0000000006000000,UL)
#define TSBMAP_BASE _AC(0x0000000008000000,UL)
#define MODULES_VADDR _AC(0x0000000010000000,UL)
#define MODULES_LEN _AC(0x00000000e0000000,UL)
#define MODULES_END _AC(0x00000000f0000000,UL)
#define LOW_OBP_ADDRESS _AC(0x00000000f0000000,UL)
#define HI_OBP_ADDRESS _AC(0x0000000100000000,UL)
#define VMALLOC_START _AC(0x0000000100000000,UL)
#define VMALLOC_END _AC(0x0000000200000000,UL)
#define VMEMMAP_BASE _AC(0x0000000200000000,UL)
#define vmemmap ((struct page *)VMEMMAP_BASE)
/* XXX All of this needs to be rethought so we can take advantage
* XXX cheetah's full 64-bit virtual address space, ie. no more hole
* XXX in the middle like on spitfire. -DaveM
*/
/*
* Given a virtual address, the lowest PAGE_SHIFT bits determine offset
* into the page; the next higher PAGE_SHIFT-3 bits determine the pte#
* in the proper pagetable (the -3 is from the 8 byte ptes, and each page
* table is a single page long). The next higher PMD_BITS determine pmd#
* in the proper pmdtable (where we must have PMD_BITS <= (PAGE_SHIFT-2)
* since the pmd entries are 4 bytes, and each pmd page is a single page
* long). Finally, the higher few bits determine pgde#.
*/
/* PMD_SHIFT determines the size of the area a second-level page
* table can map
*/
#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3))
#define PMD_SIZE (_AC(1,UL) << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE-1))
#define PMD_BITS (PAGE_SHIFT - 2)
/* PGDIR_SHIFT determines what a third-level page table entry can map */
#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3) + PMD_BITS)
#define PGDIR_SIZE (_AC(1,UL) << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define PGDIR_BITS (PAGE_SHIFT - 2)
#ifndef __ASSEMBLY__
#include <linux/sched.h>
/* Entries per page directory level. */
#define PTRS_PER_PTE (1UL << (PAGE_SHIFT-3))
#define PTRS_PER_PMD (1UL << PMD_BITS)
#define PTRS_PER_PGD (1UL << PGDIR_BITS)
/* Kernel has a separate 44bit address space. */
#define FIRST_USER_ADDRESS 0
#define pte_ERROR(e) __builtin_trap()
#define pmd_ERROR(e) __builtin_trap()
#define pgd_ERROR(e) __builtin_trap()
#endif /* !(__ASSEMBLY__) */
/* PTE bits which are the same in SUN4U and SUN4V format. */
#define _PAGE_VALID _AC(0x8000000000000000,UL) /* Valid TTE */
#define _PAGE_R _AC(0x8000000000000000,UL) /* Keep ref bit uptodate*/
/* SUN4U pte bits... */
#define _PAGE_SZ4MB_4U _AC(0x6000000000000000,UL) /* 4MB Page */
#define _PAGE_SZ512K_4U _AC(0x4000000000000000,UL) /* 512K Page */
#define _PAGE_SZ64K_4U _AC(0x2000000000000000,UL) /* 64K Page */
#define _PAGE_SZ8K_4U _AC(0x0000000000000000,UL) /* 8K Page */
#define _PAGE_NFO_4U _AC(0x1000000000000000,UL) /* No Fault Only */
#define _PAGE_IE_4U _AC(0x0800000000000000,UL) /* Invert Endianness */
#define _PAGE_SOFT2_4U _AC(0x07FC000000000000,UL) /* Software bits, set 2 */
#define _PAGE_RES1_4U _AC(0x0002000000000000,UL) /* Reserved */
#define _PAGE_SZ32MB_4U _AC(0x0001000000000000,UL) /* (Panther) 32MB page */
#define _PAGE_SZ256MB_4U _AC(0x2001000000000000,UL) /* (Panther) 256MB page */
#define _PAGE_SZALL_4U _AC(0x6001000000000000,UL) /* All pgsz bits */
#define _PAGE_SN_4U _AC(0x0000800000000000,UL) /* (Cheetah) Snoop */
#define _PAGE_RES2_4U _AC(0x0000780000000000,UL) /* Reserved */
#define _PAGE_PADDR_4U _AC(0x000007FFFFFFE000,UL) /* (Cheetah) pa[42:13] */
#define _PAGE_SOFT_4U _AC(0x0000000000001F80,UL) /* Software bits: */
#define _PAGE_EXEC_4U _AC(0x0000000000001000,UL) /* Executable SW bit */
#define _PAGE_MODIFIED_4U _AC(0x0000000000000800,UL) /* Modified (dirty) */
#define _PAGE_FILE_4U _AC(0x0000000000000800,UL) /* Pagecache page */
#define _PAGE_ACCESSED_4U _AC(0x0000000000000400,UL) /* Accessed (ref'd) */
#define _PAGE_READ_4U _AC(0x0000000000000200,UL) /* Readable SW Bit */
#define _PAGE_WRITE_4U _AC(0x0000000000000100,UL) /* Writable SW Bit */
#define _PAGE_PRESENT_4U _AC(0x0000000000000080,UL) /* Present */
#define _PAGE_L_4U _AC(0x0000000000000040,UL) /* Locked TTE */
#define _PAGE_CP_4U _AC(0x0000000000000020,UL) /* Cacheable in P-Cache */
#define _PAGE_CV_4U _AC(0x0000000000000010,UL) /* Cacheable in V-Cache */
#define _PAGE_E_4U _AC(0x0000000000000008,UL) /* side-Effect */
#define _PAGE_P_4U _AC(0x0000000000000004,UL) /* Privileged Page */
#define _PAGE_W_4U _AC(0x0000000000000002,UL) /* Writable */
/* SUN4V pte bits... */
#define _PAGE_NFO_4V _AC(0x4000000000000000,UL) /* No Fault Only */
#define _PAGE_SOFT2_4V _AC(0x3F00000000000000,UL) /* Software bits, set 2 */
#define _PAGE_MODIFIED_4V _AC(0x2000000000000000,UL) /* Modified (dirty) */
#define _PAGE_ACCESSED_4V _AC(0x1000000000000000,UL) /* Accessed (ref'd) */
#define _PAGE_READ_4V _AC(0x0800000000000000,UL) /* Readable SW Bit */
#define _PAGE_WRITE_4V _AC(0x0400000000000000,UL) /* Writable SW Bit */
#define _PAGE_PADDR_4V _AC(0x00FFFFFFFFFFE000,UL) /* paddr[55:13] */
#define _PAGE_IE_4V _AC(0x0000000000001000,UL) /* Invert Endianness */
#define _PAGE_E_4V _AC(0x0000000000000800,UL) /* side-Effect */
#define _PAGE_CP_4V _AC(0x0000000000000400,UL) /* Cacheable in P-Cache */
#define _PAGE_CV_4V _AC(0x0000000000000200,UL) /* Cacheable in V-Cache */
#define _PAGE_P_4V _AC(0x0000000000000100,UL) /* Privileged Page */
#define _PAGE_EXEC_4V _AC(0x0000000000000080,UL) /* Executable Page */
#define _PAGE_W_4V _AC(0x0000000000000040,UL) /* Writable */
#define _PAGE_SOFT_4V _AC(0x0000000000000030,UL) /* Software bits */
#define _PAGE_FILE_4V _AC(0x0000000000000020,UL) /* Pagecache page */
#define _PAGE_PRESENT_4V _AC(0x0000000000000010,UL) /* Present */
#define _PAGE_RESV_4V _AC(0x0000000000000008,UL) /* Reserved */
#define _PAGE_SZ16GB_4V _AC(0x0000000000000007,UL) /* 16GB Page */
#define _PAGE_SZ2GB_4V _AC(0x0000000000000006,UL) /* 2GB Page */
#define _PAGE_SZ256MB_4V _AC(0x0000000000000005,UL) /* 256MB Page */
#define _PAGE_SZ32MB_4V _AC(0x0000000000000004,UL) /* 32MB Page */
#define _PAGE_SZ4MB_4V _AC(0x0000000000000003,UL) /* 4MB Page */
#define _PAGE_SZ512K_4V _AC(0x0000000000000002,UL) /* 512K Page */
#define _PAGE_SZ64K_4V _AC(0x0000000000000001,UL) /* 64K Page */
#define _PAGE_SZ8K_4V _AC(0x0000000000000000,UL) /* 8K Page */
#define _PAGE_SZALL_4V _AC(0x0000000000000007,UL) /* All pgsz bits */
#if PAGE_SHIFT == 13
#define _PAGE_SZBITS_4U _PAGE_SZ8K_4U
#define _PAGE_SZBITS_4V _PAGE_SZ8K_4V
#elif PAGE_SHIFT == 16
#define _PAGE_SZBITS_4U _PAGE_SZ64K_4U
#define _PAGE_SZBITS_4V _PAGE_SZ64K_4V
#else
#error Wrong PAGE_SHIFT specified
#endif
#if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
#define _PAGE_SZHUGE_4U _PAGE_SZ4MB_4U
#define _PAGE_SZHUGE_4V _PAGE_SZ4MB_4V
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
#define _PAGE_SZHUGE_4U _PAGE_SZ512K_4U
#define _PAGE_SZHUGE_4V _PAGE_SZ512K_4V
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
#define _PAGE_SZHUGE_4U _PAGE_SZ64K_4U
#define _PAGE_SZHUGE_4V _PAGE_SZ64K_4V
#endif
/* These are actually filled in at boot time by sun4{u,v}_pgprot_init() */
#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)
#ifndef __ASSEMBLY__
extern pte_t mk_pte_io(unsigned long, pgprot_t, int, unsigned long);
extern unsigned long pte_sz_bits(unsigned long size);
extern pgprot_t PAGE_KERNEL;
extern pgprot_t PAGE_KERNEL_LOCKED;
extern pgprot_t PAGE_COPY;
extern pgprot_t PAGE_SHARED;
/* XXX This uglyness is for the atyfb driver's sparc mmap() support. XXX */
extern unsigned long _PAGE_IE;
extern unsigned long _PAGE_E;
extern unsigned long _PAGE_CACHE;
extern unsigned long pg_iobits;
extern unsigned long _PAGE_ALL_SZ_BITS;
extern unsigned long _PAGE_SZBITS;
extern struct page *mem_map_zero;
#define ZERO_PAGE(vaddr) (mem_map_zero)
/* PFNs are real physical page numbers. However, mem_map only begins to record
* per-page information starting at pfn_base. This is to handle systems where
* the first physical page in the machine is at some huge physical address,
* such as 4GB. This is common on a partitioned E10000, for example.
*/
static inline pte_t pfn_pte(unsigned long pfn, pgprot_t prot)
{
unsigned long paddr = pfn << PAGE_SHIFT;
unsigned long sz_bits;
sz_bits = 0UL;
if (_PAGE_SZBITS_4U != 0UL || _PAGE_SZBITS_4V != 0UL) {
__asm__ __volatile__(
"\n661: sethi %%uhi(%1), %0\n"
" sllx %0, 32, %0\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" mov %2, %0\n"
" nop\n"
" .previous\n"
: "=r" (sz_bits)
: "i" (_PAGE_SZBITS_4U), "i" (_PAGE_SZBITS_4V));
}
return __pte(paddr | sz_bits | pgprot_val(prot));
}
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
/* This one can be done with two shifts. */
static inline unsigned long pte_pfn(pte_t pte)
{
unsigned long ret;
__asm__ __volatile__(
"\n661: sllx %1, %2, %0\n"
" srlx %0, %3, %0\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" sllx %1, %4, %0\n"
" srlx %0, %5, %0\n"
" .previous\n"
: "=r" (ret)
: "r" (pte_val(pte)),
"i" (21), "i" (21 + PAGE_SHIFT),
"i" (8), "i" (8 + PAGE_SHIFT));
return ret;
}
#define pte_page(x) pfn_to_page(pte_pfn(x))
static inline pte_t pte_modify(pte_t pte, pgprot_t prot)
{
unsigned long mask, tmp;
/* SUN4U: 0x600307ffffffecb8 (negated == 0x9ffcf80000001347)
* SUN4V: 0x30ffffffffffee17 (negated == 0xcf000000000011e8)
*
* Even if we use negation tricks the result is still a 6
* instruction sequence, so don't try to play fancy and just
* do the most straightforward implementation.
*
* Note: We encode this into 3 sun4v 2-insn patch sequences.
*/
__asm__ __volatile__(
"\n661: sethi %%uhi(%2), %1\n"
" sethi %%hi(%2), %0\n"
"\n662: or %1, %%ulo(%2), %1\n"
" or %0, %%lo(%2), %0\n"
"\n663: sllx %1, 32, %1\n"
" or %0, %1, %0\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" sethi %%uhi(%3), %1\n"
" sethi %%hi(%3), %0\n"
" .word 662b\n"
" or %1, %%ulo(%3), %1\n"
" or %0, %%lo(%3), %0\n"
" .word 663b\n"
" sllx %1, 32, %1\n"
" or %0, %1, %0\n"
" .previous\n"
: "=r" (mask), "=r" (tmp)
: "i" (_PAGE_PADDR_4U | _PAGE_MODIFIED_4U | _PAGE_ACCESSED_4U |
_PAGE_CP_4U | _PAGE_CV_4U | _PAGE_E_4U | _PAGE_PRESENT_4U |
_PAGE_SZBITS_4U),
"i" (_PAGE_PADDR_4V | _PAGE_MODIFIED_4V | _PAGE_ACCESSED_4V |
_PAGE_CP_4V | _PAGE_CV_4V | _PAGE_E_4V | _PAGE_PRESENT_4V |
_PAGE_SZBITS_4V));
return __pte((pte_val(pte) & mask) | (pgprot_val(prot) & ~mask));
}
static inline pte_t pgoff_to_pte(unsigned long off)
{
off <<= PAGE_SHIFT;
__asm__ __volatile__(
"\n661: or %0, %2, %0\n"
" .section .sun4v_1insn_patch, \"ax\"\n"
" .word 661b\n"
" or %0, %3, %0\n"
" .previous\n"
: "=r" (off)
: "0" (off), "i" (_PAGE_FILE_4U), "i" (_PAGE_FILE_4V));
return __pte(off);
}
static inline pgprot_t pgprot_noncached(pgprot_t prot)
{
unsigned long val = pgprot_val(prot);
__asm__ __volatile__(
"\n661: andn %0, %2, %0\n"
" or %0, %3, %0\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" andn %0, %4, %0\n"
" or %0, %5, %0\n"
" .previous\n"
: "=r" (val)
: "0" (val), "i" (_PAGE_CP_4U | _PAGE_CV_4U), "i" (_PAGE_E_4U),
"i" (_PAGE_CP_4V | _PAGE_CV_4V), "i" (_PAGE_E_4V));
return __pgprot(val);
}
/* Various pieces of code check for platform support by ifdef testing
* on "pgprot_noncached". That's broken and should be fixed, but for
* now...
*/
#define pgprot_noncached pgprot_noncached
#ifdef CONFIG_HUGETLB_PAGE
static inline pte_t pte_mkhuge(pte_t pte)
{
unsigned long mask;
__asm__ __volatile__(
"\n661: sethi %%uhi(%1), %0\n"
" sllx %0, 32, %0\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" mov %2, %0\n"
" nop\n"
" .previous\n"
: "=r" (mask)
: "i" (_PAGE_SZHUGE_4U), "i" (_PAGE_SZHUGE_4V));
return __pte(pte_val(pte) | mask);
}
#endif
static inline pte_t pte_mkdirty(pte_t pte)
{
unsigned long val = pte_val(pte), tmp;
__asm__ __volatile__(
"\n661: or %0, %3, %0\n"
" nop\n"
"\n662: nop\n"
" nop\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" sethi %%uhi(%4), %1\n"
" sllx %1, 32, %1\n"
" .word 662b\n"
" or %1, %%lo(%4), %1\n"
" or %0, %1, %0\n"
" .previous\n"
: "=r" (val), "=r" (tmp)
: "0" (val), "i" (_PAGE_MODIFIED_4U | _PAGE_W_4U),
"i" (_PAGE_MODIFIED_4V | _PAGE_W_4V));
return __pte(val);
}
static inline pte_t pte_mkclean(pte_t pte)
{
unsigned long val = pte_val(pte), tmp;
__asm__ __volatile__(
"\n661: andn %0, %3, %0\n"
" nop\n"
"\n662: nop\n"
" nop\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" sethi %%uhi(%4), %1\n"
" sllx %1, 32, %1\n"
" .word 662b\n"
" or %1, %%lo(%4), %1\n"
" andn %0, %1, %0\n"
" .previous\n"
: "=r" (val), "=r" (tmp)
: "0" (val), "i" (_PAGE_MODIFIED_4U | _PAGE_W_4U),
"i" (_PAGE_MODIFIED_4V | _PAGE_W_4V));
return __pte(val);
}
static inline pte_t pte_mkwrite(pte_t pte)
{
unsigned long val = pte_val(pte), mask;
__asm__ __volatile__(
"\n661: mov %1, %0\n"
" nop\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" sethi %%uhi(%2), %0\n"
" sllx %0, 32, %0\n"
" .previous\n"
: "=r" (mask)
: "i" (_PAGE_WRITE_4U), "i" (_PAGE_WRITE_4V));
return __pte(val | mask);
}
static inline pte_t pte_wrprotect(pte_t pte)
{
unsigned long val = pte_val(pte), tmp;
__asm__ __volatile__(
"\n661: andn %0, %3, %0\n"
" nop\n"
"\n662: nop\n"
" nop\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" sethi %%uhi(%4), %1\n"
" sllx %1, 32, %1\n"
" .word 662b\n"
" or %1, %%lo(%4), %1\n"
" andn %0, %1, %0\n"
" .previous\n"
: "=r" (val), "=r" (tmp)
: "0" (val), "i" (_PAGE_WRITE_4U | _PAGE_W_4U),
"i" (_PAGE_WRITE_4V | _PAGE_W_4V));
return __pte(val);
}
static inline pte_t pte_mkold(pte_t pte)
{
unsigned long mask;
__asm__ __volatile__(
"\n661: mov %1, %0\n"
" nop\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" sethi %%uhi(%2), %0\n"
" sllx %0, 32, %0\n"
" .previous\n"
: "=r" (mask)
: "i" (_PAGE_ACCESSED_4U), "i" (_PAGE_ACCESSED_4V));
mask |= _PAGE_R;
return __pte(pte_val(pte) & ~mask);
}
static inline pte_t pte_mkyoung(pte_t pte)
{
unsigned long mask;
__asm__ __volatile__(
"\n661: mov %1, %0\n"
" nop\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" sethi %%uhi(%2), %0\n"
" sllx %0, 32, %0\n"
" .previous\n"
: "=r" (mask)
: "i" (_PAGE_ACCESSED_4U), "i" (_PAGE_ACCESSED_4V));
mask |= _PAGE_R;
return __pte(pte_val(pte) | mask);
}
static inline pte_t pte_mkspecial(pte_t pte)
{
return pte;
}
static inline unsigned long pte_young(pte_t pte)
{
unsigned long mask;
__asm__ __volatile__(
"\n661: mov %1, %0\n"
" nop\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" sethi %%uhi(%2), %0\n"
" sllx %0, 32, %0\n"
" .previous\n"
: "=r" (mask)
: "i" (_PAGE_ACCESSED_4U), "i" (_PAGE_ACCESSED_4V));
return (pte_val(pte) & mask);
}
static inline unsigned long pte_dirty(pte_t pte)
{
unsigned long mask;
__asm__ __volatile__(
"\n661: mov %1, %0\n"
" nop\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" sethi %%uhi(%2), %0\n"
" sllx %0, 32, %0\n"
" .previous\n"
: "=r" (mask)
: "i" (_PAGE_MODIFIED_4U), "i" (_PAGE_MODIFIED_4V));
return (pte_val(pte) & mask);
}
static inline unsigned long pte_write(pte_t pte)
{
unsigned long mask;
__asm__ __volatile__(
"\n661: mov %1, %0\n"
" nop\n"
" .section .sun4v_2insn_patch, \"ax\"\n"
" .word 661b\n"
" sethi %%uhi(%2), %0\n"
" sllx %0, 32, %0\n"
" .previous\n"
: "=r" (mask)
: "i" (_PAGE_WRITE_4U), "i" (_PAGE_WRITE_4V));
return (pte_val(pte) & mask);
}
static inline unsigned long pte_exec(pte_t pte)
{
unsigned long mask;
__asm__ __volatile__(
"\n661: sethi %%hi(%1), %0\n"
" .section .sun4v_1insn_patch, \"ax\"\n"
" .word 661b\n"
" mov %2, %0\n"
" .previous\n"
: "=r" (mask)
: "i" (_PAGE_EXEC_4U), "i" (_PAGE_EXEC_4V));
return (pte_val(pte) & mask);
}
static inline unsigned long pte_file(pte_t pte)
{
unsigned long val = pte_val(pte);
__asm__ __volatile__(
"\n661: and %0, %2, %0\n"
" .section .sun4v_1insn_patch, \"ax\"\n"
" .word 661b\n"
" and %0, %3, %0\n"
" .previous\n"
: "=r" (val)
: "0" (val), "i" (_PAGE_FILE_4U), "i" (_PAGE_FILE_4V));
return val;
}
static inline unsigned long pte_present(pte_t pte)
{
unsigned long val = pte_val(pte);
__asm__ __volatile__(
"\n661: and %0, %2, %0\n"
" .section .sun4v_1insn_patch, \"ax\"\n"
" .word 661b\n"
" and %0, %3, %0\n"
" .previous\n"
: "=r" (val)
: "0" (val), "i" (_PAGE_PRESENT_4U), "i" (_PAGE_PRESENT_4V));
return val;
}
static inline int pte_special(pte_t pte)
{
return 0;
}
#define pmd_set(pmdp, ptep) \
(pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> 11UL))
#define pud_set(pudp, pmdp) \
(pud_val(*(pudp)) = (__pa((unsigned long) (pmdp)) >> 11UL))
#define __pmd_page(pmd) \
((unsigned long) __va((((unsigned long)pmd_val(pmd))<<11UL)))
#define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd))
#define pud_page_vaddr(pud) \
((unsigned long) __va((((unsigned long)pud_val(pud))<<11UL)))
#define pud_page(pud) virt_to_page((void *)pud_page_vaddr(pud))
#define pmd_none(pmd) (!pmd_val(pmd))
#define pmd_bad(pmd) (0)
#define pmd_present(pmd) (pmd_val(pmd) != 0U)
#define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0U)
#define pud_none(pud) (!pud_val(pud))
#define pud_bad(pud) (0)
#define pud_present(pud) (pud_val(pud) != 0U)
#define pud_clear(pudp) (pud_val(*(pudp)) = 0U)
/* Same in both SUN4V and SUN4U. */
#define pte_none(pte) (!pte_val(pte))
/* to find an entry in a page-table-directory. */
#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
#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.. */
#define pmd_offset(pudp, address) \
((pmd_t *) pud_page_vaddr(*(pudp)) + \
(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)))
/* Find an entry in the third-level page table.. */
#define pte_index(dir, address) \
((pte_t *) __pmd_page(*(dir)) + \
((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
#define pte_offset_kernel pte_index
#define pte_offset_map pte_index
#define pte_offset_map_nested pte_index
#define pte_unmap(pte) do { } while (0)
#define pte_unmap_nested(pte) do { } while (0)
/* Actual page table PTE updates. */
extern void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig);
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
{
pte_t orig = *ptep;
*ptep = pte;
/* It is more efficient to let flush_tlb_kernel_range()
* handle init_mm tlb flushes.
*
* SUN4V NOTE: _PAGE_VALID is the same value in both the SUN4U
* and SUN4V pte layout, so this inline test is fine.
*/
if (likely(mm != &init_mm) && (pte_val(orig) & _PAGE_VALID))
tlb_batch_add(mm, addr, ptep, orig);
}
#define pte_clear(mm,addr,ptep) \
set_pte_at((mm), (addr), (ptep), __pte(0UL))
#ifdef DCACHE_ALIASING_POSSIBLE
#define __HAVE_ARCH_MOVE_PTE
#define move_pte(pte, prot, old_addr, new_addr) \
({ \
pte_t newpte = (pte); \
if (tlb_type != hypervisor && pte_present(pte)) { \
unsigned long this_pfn = pte_pfn(pte); \
\
if (pfn_valid(this_pfn) && \
(((old_addr) ^ (new_addr)) & (1 << 13))) \
flush_dcache_page_all(current->mm, \
pfn_to_page(this_pfn)); \
} \
newpte; \
})
#endif
extern pgd_t swapper_pg_dir[2048];
extern pmd_t swapper_low_pmd_dir[2048];
extern void paging_init(void);
extern unsigned long find_ecache_flush_span(unsigned long size);
/* These do nothing with the way I have things setup. */
#define mmu_lockarea(vaddr, len) (vaddr)
#define mmu_unlockarea(vaddr, len) do { } while(0)
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 >> PAGE_SHIFT) & 0xffUL)
#define __swp_offset(entry) ((entry).val >> (PAGE_SHIFT + 8UL))
#define __swp_entry(type, offset) \
( (swp_entry_t) \
{ \
(((long)(type) << PAGE_SHIFT) | \
((long)(offset) << (PAGE_SHIFT + 8UL))) \
} )
#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 support. */
extern unsigned long pte_file(pte_t);
#define pte_to_pgoff(pte) (pte_val(pte) >> PAGE_SHIFT)
extern pte_t pgoff_to_pte(unsigned long);
#define PTE_FILE_MAX_BITS (64UL - PAGE_SHIFT - 1UL)
extern unsigned long sparc64_valid_addr_bitmap[];
/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
static inline bool kern_addr_valid(unsigned long addr)
{
unsigned long paddr = __pa(addr);
if ((paddr >> 41UL) != 0UL)
return false;
return test_bit(paddr >> 22, sparc64_valid_addr_bitmap);
}
extern int page_in_phys_avail(unsigned long paddr);
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 & 0x0fffffffffffffffUL)
#include <asm-generic/pgtable.h>
/* We provide our own get_unmapped_area to cope with VA holes and
* SHM area cache aliasing for userland.
*/
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
/* We provide a special get_unmapped_area for framebuffer mmaps to try and use
* the largest alignment possible such that larget PTEs can be used.
*/
extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
unsigned long, unsigned long,
unsigned long);
#define HAVE_ARCH_FB_UNMAPPED_AREA
extern void pgtable_cache_init(void);
extern void sun4v_register_fault_status(void);
extern void sun4v_ktsb_register(void);
extern void __init cheetah_ecache_flush_init(void);
extern void sun4v_patch_tlb_handlers(void);
extern unsigned long cmdline_memory_size;
extern asmlinkage void do_sparc64_fault(struct pt_regs *regs);
#endif /* !(__ASSEMBLY__) */
#endif /* !(_SPARC64_PGTABLE_H) */
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