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149 lines
4.1 KiB
149 lines
4.1 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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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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#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_DATA_FLAGS_NON_EXEC |
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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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