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/*
 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 *
 */

#ifndef _ASM_TILE_PGTABLE_32_H
#define _ASM_TILE_PGTABLE_32_H

/*
 * The level-1 index is defined by the huge page size.  A PGD is composed
 * of PTRS_PER_PGD pgd_t's and is the top level of the page table.
 */
#define PGDIR_SHIFT	HPAGE_SHIFT
#define PGDIR_SIZE	HPAGE_SIZE
#define PGDIR_MASK	(~(PGDIR_SIZE-1))
#define PTRS_PER_PGD	_HV_L1_ENTRIES(HPAGE_SHIFT)
#define PGD_INDEX(va)	_HV_L1_INDEX(va, HPAGE_SHIFT)
#define SIZEOF_PGD	_HV_L1_SIZE(HPAGE_SHIFT)

/*
 * The level-2 index is defined by the difference between the huge
 * page size and the normal page size.  A PTE is composed of
 * PTRS_PER_PTE pte_t's and is the bottom level of the page table.
 * Note that the hypervisor docs use PTE for what we call pte_t, so
 * this nomenclature is somewhat confusing.
 */
#define PTRS_PER_PTE	_HV_L2_ENTRIES(HPAGE_SHIFT, PAGE_SHIFT)
#define PTE_INDEX(va)	_HV_L2_INDEX(va, HPAGE_SHIFT, PAGE_SHIFT)
#define SIZEOF_PTE	_HV_L2_SIZE(HPAGE_SHIFT, PAGE_SHIFT)

#ifndef __ASSEMBLY__

/*
 * Right now we initialize only a single pte table. It can be extended
 * easily, subsequent pte tables have to be allocated in one physical
 * chunk of RAM.
 *
 * HOWEVER, if we are using an allocation scheme with slop after the
 * end of the page table (e.g. where our L2 page tables are 2KB but
 * our pages are 64KB and we are allocating via the page allocator)
 * we can't extend it easily.
 */
#define LAST_PKMAP PTRS_PER_PTE

#define PKMAP_BASE   ((FIXADDR_BOOT_START - PAGE_SIZE*LAST_PKMAP) & PGDIR_MASK)

#ifdef CONFIG_HIGHMEM
# define _VMALLOC_END	(PKMAP_BASE & ~(HPAGE_SIZE-1))
#else
# define _VMALLOC_END	(FIXADDR_START & ~(HPAGE_SIZE-1))
#endif

/*
 * Align the vmalloc area to an L2 page table, and leave a guard page
 * at the beginning and end.  The vmalloc code also puts in an internal
 * guard page between each allocation.
 */
#define VMALLOC_END	(_VMALLOC_END - PAGE_SIZE)
extern unsigned long VMALLOC_RESERVE /* = CONFIG_VMALLOC_RESERVE */;
#define _VMALLOC_START	(_VMALLOC_END - VMALLOC_RESERVE)
#define VMALLOC_START	(_VMALLOC_START + PAGE_SIZE)

/* This is the maximum possible amount of lowmem. */
#define MAXMEM		(_VMALLOC_START - PAGE_OFFSET)

/* We have no pmd or pud since we are strictly a two-level page table */
#define __ARCH_USE_5LEVEL_HACK
#include <asm-generic/pgtable-nopmd.h>

static inline int pud_huge_page(pud_t pud)	{ return 0; }

/* We don't define any pgds for these addresses. */
static inline int pgd_addr_invalid(unsigned long addr)
{
	return addr >= MEM_HV_START;
}

/*
 * Provide versions of these routines that can be used safely when
 * the hypervisor may be asynchronously modifying dirty/accessed bits.
 * ptep_get_and_clear() matches the generic one but we provide it to
 * be parallel with the 64-bit code.
 */
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define __HAVE_ARCH_PTEP_SET_WRPROTECT

extern int ptep_test_and_clear_young(struct vm_area_struct *,
				     unsigned long addr, pte_t *);
extern void ptep_set_wrprotect(struct mm_struct *,
			       unsigned long addr, pte_t *);

#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)
{
	pte_t pte = *ptep;
	pte_clear(_mm, addr, ptep);
	return pte;
}

/*
 * pmds are wrappers around pgds, which are the same as ptes.
 * It's often convenient to "cast" back and forth and use the pte methods,
 * which are the methods supplied by the hypervisor.
 */
#define pmd_pte(pmd) ((pmd).pud.pgd)
#define pmdp_ptep(pmdp) (&(pmdp)->pud.pgd)
#define pte_pmd(pte) ((pmd_t){ { (pte) } })

#endif /* __ASSEMBLY__ */

#endif /* _ASM_TILE_PGTABLE_32_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 439 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 5.14 KB 0644
atomic_32.h File 8.91 KB 0644
atomic_64.h File 5.51 KB 0644
backtrace.h File 3.98 KB 0644
barrier.h File 2.89 KB 0644
bitops.h File 2.37 KB 0644
bitops_32.h File 4.01 KB 0644
bitops_64.h File 2.67 KB 0644
cache.h File 2.6 KB 0644
cacheflush.h File 4.94 KB 0644
checksum.h File 1.23 KB 0644
cmpxchg.h File 3.47 KB 0644
compat.h File 7.38 KB 0644
current.h File 947 B 0644
delay.h File 1.1 KB 0644
device.h File 978 B 0644
div64.h File 319 B 0644
dma-mapping.h File 1.82 KB 0644
dma.h File 762 B 0644
elf.h File 5.42 KB 0644
fixmap.h File 2.73 KB 0644
ftrace.h File 1.08 KB 0644
futex.h File 4.23 KB 0644
hardirq.h File 1.28 KB 0644
hardwall.h File 1.08 KB 0644
highmem.h File 2.08 KB 0644
homecache.h File 4.21 KB 0644
hugetlb.h File 3.04 KB 0644
hv_driver.h File 1.92 KB 0644
ide.h File 758 B 0644
insn.h File 1.79 KB 0644
io.h File 12.43 KB 0644
irq.h File 3.11 KB 0644
irq_work.h File 283 B 0644
irqflags.h File 10.55 KB 0644
jump_label.h File 1.47 KB 0644
kdebug.h File 769 B 0644
kexec.h File 2.23 KB 0644
kgdb.h File 1.99 KB 0644
kmap_types.h File 1.02 KB 0644
kprobes.h File 2.19 KB 0644
linkage.h File 1.46 KB 0644
mmu.h File 965 B 0644
mmu_context.h File 4.5 KB 0644
mmzone.h File 2.07 KB 0644
module.h File 1.12 KB 0644
page.h File 10.32 KB 0644
pci.h File 6.58 KB 0644
percpu.h File 1.79 KB 0644
perf_event.h File 766 B 0644
pgalloc.h File 4.76 KB 0644
pgtable.h File 15.66 KB 0644
pgtable_32.h File 4.08 KB 0644
pgtable_64.h File 5.11 KB 0644
pmc.h File 2.15 KB 0644
processor.h File 10.62 KB 0644
ptrace.h File 2.96 KB 0644
sections.h File 1.37 KB 0644
setup.h File 1.63 KB 0644
sigframe.h File 956 B 0644
signal.h File 1.07 KB 0644
smp.h File 3.98 KB 0644
spinlock.h File 741 B 0644
spinlock_32.h File 2.9 KB 0644
spinlock_64.h File 3.88 KB 0644
spinlock_types.h File 1.58 KB 0644
stack.h File 2.59 KB 0644
string.h File 1.19 KB 0644
switch_to.h File 2.75 KB 0644
syscall.h File 2.88 KB 0644
syscalls.h File 2.35 KB 0644
thread_info.h File 5.54 KB 0644
tile-desc.h File 650 B 0644
tile-desc_32.h File 12.54 KB 0644
tile-desc_64.h File 10.83 KB 0644
timex.h File 1.71 KB 0644
tlb.h File 878 B 0644
tlbflush.h File 3.99 KB 0644
topology.h File 1.52 KB 0644
traps.h File 2.44 KB 0644
uaccess.h File 12.77 KB 0644
unaligned.h File 1.56 KB 0644
unistd.h File 777 B 0644
user.h File 717 B 0644
vdso.h File 1.84 KB 0644
vga.h File 1.05 KB 0644
word-at-a-time.h File 1.07 KB 0644