164 lines
4.7 KiB
C
164 lines
4.7 KiB
C
/*
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* Page management definitions for the Hexagon architecture
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*
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* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef _ASM_PAGE_H
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#define _ASM_PAGE_H
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#include <linux/const.h>
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/* This is probably not the most graceful way to handle this. */
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#ifdef CONFIG_PAGE_SIZE_4KB
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#define PAGE_SHIFT 12
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#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_4KB
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#endif
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#ifdef CONFIG_PAGE_SIZE_16KB
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#define PAGE_SHIFT 14
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#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_16KB
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#endif
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#ifdef CONFIG_PAGE_SIZE_64KB
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#define PAGE_SHIFT 16
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#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_64KB
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#endif
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#ifdef CONFIG_PAGE_SIZE_256KB
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#define PAGE_SHIFT 18
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#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_256KB
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#endif
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#ifdef CONFIG_PAGE_SIZE_1MB
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#define PAGE_SHIFT 20
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#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_1MB
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#endif
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/*
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* These should be defined in hugetlb.h, but apparently not.
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* "Huge" for us should be 4MB or 16MB, which are both represented
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* in L1 PTE's. Right now, it's set up for 4MB.
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*/
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#ifdef CONFIG_HUGETLB_PAGE
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#define HPAGE_SHIFT 22
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#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE-1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
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#define HVM_HUGEPAGE_SIZE 0x5
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#endif
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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/*
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* This is for PFN_DOWN, which mm.h needs. Seems the right place to pull it in.
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*/
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#include <linux/pfn.h>
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/*
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* We implement a two-level architecture-specific page table structure.
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* Null intermediate page table level (pmd, pud) definitions will come from
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* asm-generic/pagetable-nopmd.h and asm-generic/pagetable-nopud.h
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*/
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long pgd; } pgd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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typedef struct page *pgtable_t;
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#define pte_val(x) ((x).pte)
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pte(x) ((pte_t) { (x) })
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#define __pgd(x) ((pgd_t) { (x) })
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#define __pgprot(x) ((pgprot_t) { (x) })
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/*
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* We need a __pa and a __va routine for kernel space.
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* MIPS says they're only used during mem_init.
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* also, check if we need a PHYS_OFFSET.
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*/
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#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
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#define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET))
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/* The "page frame" descriptor is defined in linux/mm.h */
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struct page;
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/* Returns page frame descriptor for virtual address. */
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#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(__pa(kaddr)))
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/* Default vm area behavior is non-executable. */
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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#define pfn_valid(pfn) ((pfn) < max_mapnr)
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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/* Need to not use a define for linesize; may move this to another file. */
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static inline void clear_page(void *page)
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{
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/* This can only be done on pages with L1 WB cache */
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asm volatile(
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" loop0(1f,%1);\n"
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"1: { dczeroa(%0);\n"
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" %0 = add(%0,#32); }:endloop0\n"
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: "+r" (page)
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: "r" (PAGE_SIZE/32)
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: "lc0", "sa0", "memory"
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);
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}
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#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
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/*
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* Under assumption that kernel always "sees" user map...
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*/
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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/*
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* page_to_phys - convert page to physical address
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* @page - pointer to page entry in mem_map
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*/
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
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#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
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#define page_to_virt(page) __va(page_to_phys(page))
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/*
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* For port to Hexagon Virtual Machine, MAYBE we check for attempts
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* to reference reserved HVM space, but in any case, the VM will be
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* protected.
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*/
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#define kern_addr_valid(addr) (1)
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#include <asm/mem-layout.h>
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#include <asm-generic/memory_model.h>
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/* XXX Todo: implement assembly-optimized version of getorder. */
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#include <asm-generic/getorder.h>
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#endif /* ifdef __ASSEMBLY__ */
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#endif /* ifdef __KERNEL__ */
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#endif
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