diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/include/asm/pgtable.h')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/include/asm/pgtable.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/include/asm/pgtable.h b/target/linux/ubicom32/files/arch/ubicom32/include/asm/pgtable.h new file mode 100644 index 000000000..ffb30a9ec --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/include/asm/pgtable.h @@ -0,0 +1,128 @@ +/* + * arch/ubicom32/include/asm/pgtable.h + * Ubicom32 pseudo page table definitions and operations. + * + * (C) Copyright 2009, Ubicom, Inc. + * Copyright (C) 2004 Microtronix Datacom Ltd + * + * This file is part of the Ubicom32 Linux Kernel Port. + * + * The Ubicom32 Linux Kernel Port 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, either version 2 of the + * License, or (at your option) any later version. + * + * The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not, + * see <http://www.gnu.org/licenses/>. + * + * Ubicom32 implementation derived from (with many thanks): + * arch/m68knommu + * arch/blackfin + * arch/parisc + * and various works, Alpha, ix86, M68K, Sparc, ...et al + */ +#ifndef _ASM_UBICOM32_PGTABLE_H +#define _ASM_UBICOM32_PGTABLE_H + +#include <asm-generic/4level-fixup.h> + +//vic - this bit copied from m68knommu version +#include <asm/setup.h> +#include <asm/io.h> +#include <linux/sched.h> + +typedef pte_t *pte_addr_t; + +#define pgd_present(pgd) (1) /* pages are always present on NO_MM */ +#define pgd_none(pgd) (0) +#define pgd_bad(pgd) (0) +#define pgd_clear(pgdp) +#define kern_addr_valid(addr) (1) +#define pmd_offset(a, b) ((void *)0) + +#define PAGE_NONE __pgprot(0) /* these mean nothing to NO_MM */ +#define PAGE_SHARED __pgprot(0) /* these mean nothing to NO_MM */ +#define PAGE_COPY __pgprot(0) /* these mean nothing to NO_MM */ +#define PAGE_READONLY __pgprot(0) /* these mean nothing to NO_MM */ +#define PAGE_KERNEL __pgprot(0) /* these mean nothing to NO_MM */ +//vic - this bit copied from m68knommu version + +extern void paging_init(void); +#define swapper_pg_dir ((pgd_t *) 0) + +#define __swp_type(x) (0) +#define __swp_offset(x) (0) +#define __swp_entry(typ,off) ((swp_entry_t) { ((typ) | ((off) << 7)) }) +#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) +#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) + +/* + * pgprot_noncached() is only for infiniband pci support, and a real + * implementation for RAM would be more complicated. + */ +#define pgprot_noncached(prot) (prot) + +static inline int pte_file(pte_t pte) { return 0; } + +/* + * ZERO_PAGE is a global shared page that is always zero: used + * for zero-mapped memory areas etc.. + */ +#define ZERO_PAGE(vaddr) (virt_to_page(0)) + +extern unsigned int kobjsize(const void *objp); +extern int is_in_rom(unsigned long); + +/* + * No page table caches to initialise + */ +#define pgtable_cache_init() do { } while (0) + +#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ + remap_pfn_range(vma, vaddr, pfn, size, prot) + +extern inline void flush_cache_mm(struct mm_struct *mm) +{ +} + +extern inline void flush_cache_range(struct mm_struct *mm, + unsigned long start, + unsigned long end) +{ +} + +/* Push the page at kernel virtual address and clear the icache */ +extern inline void flush_page_to_ram (unsigned long address) +{ +} + +/* Push n pages at kernel virtual address and clear the icache */ +extern inline void flush_pages_to_ram (unsigned long address, int n) +{ +} + +/* + * All 32bit addresses are effectively valid for vmalloc... + * Sort of meaningless for non-VM targets. + */ +#define VMALLOC_START 0 +#define VMALLOC_END 0xffffffff + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32) +#include <asm-generic/pgtable.h> +#else +#define arch_enter_lazy_mmu_mode() do {} while (0) +#define arch_leave_lazy_mmu_mode() do {} while (0) +#define arch_flush_lazy_mmu_mode() do {} while (0) +#define arch_enter_lazy_cpu_mode() do {} while (0) +#define arch_leave_lazy_cpu_mode() do {} while (0) +#define arch_flush_lazy_cpu_mode() do {} while (0) +#endif + +#endif /* _ASM_UBICOM32_PGTABLE_H */ |