/* * Page table support for the Hexagon architecture * * Copyright (c) 2010-2011, The Linux Foundation. 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 version 2 and * only version 2 as published by the Free Software Foundation. * * 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. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ #ifndef _ASM_PGALLOC_H #define _ASM_PGALLOC_H #include <asm/mem-layout.h> #include <asm/atomic.h> #define check_pgt_cache() do {} while (0) extern unsigned long long kmap_generation; /* * Page table creation interface */ static inline pgd_t *pgd_alloc(struct mm_struct *mm) { pgd_t *pgd; pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO); /* * There may be better ways to do this, but to ensure * that new address spaces always contain the kernel * base mapping, and to ensure that the user area is * initially marked invalid, initialize the new map * map with a copy of the kernel's persistent map. */ memcpy(pgd, swapper_pg_dir, PTRS_PER_PGD*sizeof(pgd_t)); mm->context.generation = kmap_generation; /* Physical version is what is passed to virtual machine on switch */ mm->context.ptbase = __pa(pgd); return pgd; } static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) { free_page((unsigned long) pgd); } static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) { struct page *pte; pte = alloc_page(GFP_KERNEL | __GFP_ZERO); if (!pte) return NULL; if (!pgtable_page_ctor(pte)) { __free_page(pte); return NULL; } return pte; } /* _kernel variant gets to use a different allocator */ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) { gfp_t flags = GFP_KERNEL | __GFP_ZERO; return (pte_t *) __get_free_page(flags); } static inline void pte_free(struct mm_struct *mm, struct page *pte) { pgtable_page_dtor(pte); __free_page(pte); } static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) { free_page((unsigned long)pte); } static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte) { /* * Conveniently, zero in 3 LSB means indirect 4K page table. * Not so convenient when you're trying to vary the page size. */ set_pmd(pmd, __pmd(((unsigned long)page_to_pfn(pte) << PAGE_SHIFT) | HEXAGON_L1_PTE_SIZE)); } /* * Other architectures seem to have ways of making all processes * share the same pmd's for their kernel mappings, but the v0.3 * Hexagon VM spec has a "monolithic" L1 table for user and kernel * segments. We track "generations" of the kernel map to minimize * overhead, and update the "slave" copies of the kernel mappings * as part of switch_mm. However, we still need to update the * kernel map of the active thread who's calling pmd_populate_kernel... */ static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) { extern spinlock_t kmap_gen_lock; pmd_t *ppmd; int pmdindex; spin_lock(&kmap_gen_lock); kmap_generation++; mm->context.generation = kmap_generation; current->active_mm->context.generation = kmap_generation; spin_unlock(&kmap_gen_lock); set_pmd(pmd, __pmd(((unsigned long)__pa(pte)) | HEXAGON_L1_PTE_SIZE)); /* * Now the "slave" copy of the current thread. * This is pointer arithmetic, not byte addresses! */ pmdindex = (pgd_t *)pmd - mm->pgd; ppmd = (pmd_t *)current->active_mm->pgd + pmdindex; set_pmd(ppmd, __pmd(((unsigned long)__pa(pte)) | HEXAGON_L1_PTE_SIZE)); if (pmdindex > max_kernel_seg) max_kernel_seg = pmdindex; } #define __pte_free_tlb(tlb, pte, addr) \ do { \ pgtable_page_dtor((pte)); \ tlb_remove_page((tlb), (pte)); \ } while (0) #endif
Name | Type | Size | Permission | Actions |
---|---|---|---|---|
Kbuild | File | 886 B | 0644 |
|
asm-offsets.h | File | 35 B | 0644 |
|
atomic.h | File | 5.27 KB | 0644 |
|
bitops.h | File | 6.62 KB | 0644 |
|
cache.h | File | 1.16 KB | 0644 |
|
cacheflush.h | File | 3.8 KB | 0644 |
|
checksum.h | File | 1.61 KB | 0644 |
|
cmpxchg.h | File | 2.55 KB | 0644 |
|
delay.h | File | 978 B | 0644 |
|
dma-mapping.h | File | 1.31 KB | 0644 |
|
dma.h | File | 934 B | 0644 |
|
elf.h | File | 6.34 KB | 0644 |
|
exec.h | File | 1.01 KB | 0644 |
|
fixmap.h | File | 1.11 KB | 0644 |
|
fpu.h | File | 90 B | 0644 |
|
futex.h | File | 2.25 KB | 0644 |
|
hexagon_vm.h | File | 6.39 KB | 0644 |
|
intrinsics.h | File | 1003 B | 0644 |
|
io.h | File | 6.95 KB | 0644 |
|
irq.h | File | 1.13 KB | 0644 |
|
irqflags.h | File | 1.46 KB | 0644 |
|
kgdb.h | File | 1.36 KB | 0644 |
|
linkage.h | File | 871 B | 0644 |
|
mem-layout.h | File | 3.42 KB | 0644 |
|
mmu.h | File | 1.1 KB | 0644 |
|
mmu_context.h | File | 2.59 KB | 0644 |
|
module.h | File | 910 B | 0644 |
|
page.h | File | 4.74 KB | 0644 |
|
perf_event.h | File | 841 B | 0644 |
|
pgalloc.h | File | 4.08 KB | 0644 |
|
pgtable.h | File | 14.15 KB | 0644 |
|
processor.h | File | 3.8 KB | 0644 |
|
smp.h | File | 1.31 KB | 0644 |
|
spinlock.h | File | 3.84 KB | 0644 |
|
spinlock_types.h | File | 1.15 KB | 0644 |
|
string.h | File | 1.08 KB | 0644 |
|
suspend.h | File | 872 B | 0644 |
|
switch_to.h | File | 1.09 KB | 0644 |
|
syscall.h | File | 1.38 KB | 0644 |
|
thread_info.h | File | 4.05 KB | 0644 |
|
time.h | File | 980 B | 0644 |
|
timer-regs.h | File | 1.23 KB | 0644 |
|
timex.h | File | 1.13 KB | 0644 |
|
tlb.h | File | 1.21 KB | 0644 |
|
tlbflush.h | File | 2.08 KB | 0644 |
|
traps.h | File | 1.02 KB | 0644 |
|
uaccess.h | File | 3.67 KB | 0644 |
|
vdso.h | File | 941 B | 0644 |
|
vm_fault.h | File | 993 B | 0644 |
|
vm_mmu.h | File | 3.37 KB | 0644 |
|