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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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f613914efc
The magic Swift SRMMU code in question has not been enabled for something on the order of a decade, and it as well as it's comment is there in the history in case we ever need it again. Therefore all implementations are NOPs and we can kill this stuff off. Signed-off-by: David S. Miller <davem@davemloft.net>
515 lines
13 KiB
C
515 lines
13 KiB
C
#ifndef _SPARC_PGTABLE_H
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#define _SPARC_PGTABLE_H
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/* asm/pgtable.h: Defines and functions used to work
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* with Sparc page tables.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <linux/const.h>
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#ifndef __ASSEMBLY__
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#include <asm-generic/4level-fixup.h>
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#include <linux/spinlock.h>
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#include <linux/swap.h>
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#include <asm/types.h>
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#include <asm/pgtsrmmu.h>
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#include <asm/vaddrs.h>
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#include <asm/oplib.h>
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#include <asm/btfixup.h>
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#include <asm/cpu_type.h>
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struct vm_area_struct;
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struct page;
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extern void load_mmu(void);
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extern unsigned long calc_highpages(void);
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#define pte_ERROR(e) __builtin_trap()
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#define pmd_ERROR(e) __builtin_trap()
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#define pgd_ERROR(e) __builtin_trap()
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#define PMD_SHIFT 22
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
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#define PGDIR_SHIFT SRMMU_PGDIR_SHIFT
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#define PGDIR_SIZE SRMMU_PGDIR_SIZE
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#define PGDIR_MASK SRMMU_PGDIR_MASK
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#define PTRS_PER_PTE 1024
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#define PTRS_PER_PMD SRMMU_PTRS_PER_PMD
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#define PTRS_PER_PGD SRMMU_PTRS_PER_PGD
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#define USER_PTRS_PER_PGD PAGE_OFFSET / SRMMU_PGDIR_SIZE
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#define FIRST_USER_ADDRESS 0
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#define PTE_SIZE (PTRS_PER_PTE*4)
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#define PAGE_NONE SRMMU_PAGE_NONE
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#define PAGE_SHARED SRMMU_PAGE_SHARED
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#define PAGE_COPY SRMMU_PAGE_COPY
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#define PAGE_READONLY SRMMU_PAGE_RDONLY
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#define PAGE_KERNEL SRMMU_PAGE_KERNEL
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/* Top-level page directory */
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extern pgd_t swapper_pg_dir[1024];
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extern void paging_init(void);
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extern unsigned long ptr_in_current_pgd;
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/* xwr */
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#define __P000 PAGE_NONE
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#define __P001 PAGE_READONLY
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#define __P010 PAGE_COPY
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#define __P011 PAGE_COPY
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#define __P100 PAGE_READONLY
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#define __P101 PAGE_READONLY
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#define __P110 PAGE_COPY
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#define __P111 PAGE_COPY
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#define __S000 PAGE_NONE
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#define __S001 PAGE_READONLY
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#define __S010 PAGE_SHARED
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#define __S011 PAGE_SHARED
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#define __S100 PAGE_READONLY
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#define __S101 PAGE_READONLY
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#define __S110 PAGE_SHARED
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#define __S111 PAGE_SHARED
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extern int num_contexts;
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/* First physical page can be anywhere, the following is needed so that
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* va-->pa and vice versa conversions work properly without performance
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* hit for all __pa()/__va() operations.
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*/
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extern unsigned long phys_base;
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extern unsigned long pfn_base;
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/*
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* BAD_PAGETABLE is used when we need a bogus page-table, while
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* BAD_PAGE is used for a bogus page.
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*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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extern pte_t * __bad_pagetable(void);
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extern pte_t __bad_page(void);
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extern unsigned long empty_zero_page;
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#define BAD_PAGETABLE __bad_pagetable()
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#define BAD_PAGE __bad_page()
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#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
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/*
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* In general all page table modifications should use the V8 atomic
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* swap instruction. This insures the mmu and the cpu are in sync
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* with respect to ref/mod bits in the page tables.
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*/
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static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value)
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{
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__asm__ __volatile__("swap [%2], %0" : "=&r" (value) : "0" (value), "r" (addr));
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return value;
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}
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/* Certain architectures need to do special things when pte's
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* within a page table are directly modified. Thus, the following
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* hook is made available.
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*/
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static inline void set_pte(pte_t *ptep, pte_t pteval)
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{
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srmmu_swap((unsigned long *)ptep, pte_val(pteval));
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}
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#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
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static inline int srmmu_device_memory(unsigned long x)
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{
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return ((x & 0xF0000000) != 0);
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}
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static inline struct page *pmd_page(pmd_t pmd)
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{
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if (srmmu_device_memory(pmd_val(pmd)))
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BUG();
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return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4));
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}
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static inline unsigned long pgd_page_vaddr(pgd_t pgd)
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{
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if (srmmu_device_memory(pgd_val(pgd))) {
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return ~0;
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} else {
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unsigned long v = pgd_val(pgd) & SRMMU_PTD_PMASK;
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return (unsigned long)__nocache_va(v << 4);
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}
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}
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static inline int pte_present(pte_t pte)
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{
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return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE);
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}
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static inline int pte_none(pte_t pte)
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{
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return !pte_val(pte);
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}
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static inline void __pte_clear(pte_t *ptep)
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{
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set_pte(ptep, __pte(0));
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}
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static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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{
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__pte_clear(ptep);
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}
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static inline int pmd_bad(pmd_t pmd)
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{
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return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
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}
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static inline int pmd_present(pmd_t pmd)
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{
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return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
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}
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static inline int pmd_none(pmd_t pmd)
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{
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return !pmd_val(pmd);
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}
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static inline void pmd_clear(pmd_t *pmdp)
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{
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int i;
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for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++)
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set_pte((pte_t *)&pmdp->pmdv[i], __pte(0));
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}
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static inline int pgd_none(pgd_t pgd)
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{
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return !(pgd_val(pgd) & 0xFFFFFFF);
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}
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static inline int pgd_bad(pgd_t pgd)
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{
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return (pgd_val(pgd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
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}
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static inline int pgd_present(pgd_t pgd)
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{
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return ((pgd_val(pgd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
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}
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static inline void pgd_clear(pgd_t *pgdp)
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{
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set_pte((pte_t *)pgdp, __pte(0));
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}
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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static inline int pte_write(pte_t pte)
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{
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return pte_val(pte) & SRMMU_WRITE;
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}
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static inline int pte_dirty(pte_t pte)
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{
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return pte_val(pte) & SRMMU_DIRTY;
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}
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static inline int pte_young(pte_t pte)
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{
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return pte_val(pte) & SRMMU_REF;
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}
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/*
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* The following only work if pte_present() is not true.
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*/
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static inline int pte_file(pte_t pte)
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{
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return pte_val(pte) & SRMMU_FILE;
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}
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static inline int pte_special(pte_t pte)
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{
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return 0;
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}
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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return __pte(pte_val(pte) & ~SRMMU_WRITE);
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}
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static inline pte_t pte_mkclean(pte_t pte)
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{
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return __pte(pte_val(pte) & ~SRMMU_DIRTY);
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}
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static inline pte_t pte_mkold(pte_t pte)
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{
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return __pte(pte_val(pte) & ~SRMMU_REF);
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}
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static inline pte_t pte_mkwrite(pte_t pte)
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{
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return __pte(pte_val(pte) | SRMMU_WRITE);
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}
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static inline pte_t pte_mkdirty(pte_t pte)
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{
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return __pte(pte_val(pte) | SRMMU_DIRTY);
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}
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static inline pte_t pte_mkyoung(pte_t pte)
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{
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return __pte(pte_val(pte) | SRMMU_REF);
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}
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#define pte_mkspecial(pte) (pte)
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#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
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static inline unsigned long pte_pfn(pte_t pte)
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{
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if (srmmu_device_memory(pte_val(pte))) {
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/* Just return something that will cause
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* pfn_valid() to return false. This makes
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* copy_one_pte() to just directly copy to
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* PTE over.
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*/
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return ~0UL;
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}
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return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4);
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}
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#define pte_page(pte) pfn_to_page(pte_pfn(pte))
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*/
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static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
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{
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return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot));
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}
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static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot)
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{
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return __pte(((page) >> 4) | pgprot_val(pgprot));
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}
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static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
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{
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return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot));
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}
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#define pgprot_noncached pgprot_noncached
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static inline pgprot_t pgprot_noncached(pgprot_t prot)
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{
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prot &= ~__pgprot(SRMMU_CACHE);
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return prot;
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}
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static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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return __pte((pte_val(pte) & SRMMU_CHG_MASK) |
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pgprot_val(newprot));
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}
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#define pgd_index(address) ((address) >> PGDIR_SHIFT)
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/* to find an entry in a page-table-directory */
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#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
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/* to find an entry in a kernel page-table-directory */
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#define pgd_offset_k(address) pgd_offset(&init_mm, address)
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/* Find an entry in the second-level page table.. */
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static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address)
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{
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return (pmd_t *) pgd_page_vaddr(*dir) +
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((address >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
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}
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/* Find an entry in the third-level page table.. */
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pte_t *pte_offset_kernel(pmd_t * dir, unsigned long address);
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/*
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* This shortcut works on sun4m (and sun4d) because the nocache area is static.
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*/
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#define pte_offset_map(d, a) pte_offset_kernel(d,a)
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#define pte_unmap(pte) do{}while(0)
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struct seq_file;
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void mmu_info(struct seq_file *m);
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/* Fault handler stuff... */
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#define FAULT_CODE_PROT 0x1
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#define FAULT_CODE_WRITE 0x2
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#define FAULT_CODE_USER 0x4
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#define update_mmu_cache(vma, address, ptep) do { } while (0)
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void srmmu_mapiorange(unsigned int bus, unsigned long xpa,
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unsigned long xva, unsigned int len);
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void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len);
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extern int invalid_segment;
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/* Encode and de-code a swap entry */
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static inline unsigned long __swp_type(swp_entry_t entry)
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{
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return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK;
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}
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static inline unsigned long __swp_offset(swp_entry_t entry)
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{
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return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK;
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}
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static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset)
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{
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return (swp_entry_t) {
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(type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT
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| (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT };
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}
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
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/* file-offset-in-pte helpers */
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static inline unsigned long pte_to_pgoff(pte_t pte)
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{
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return pte_val(pte) >> SRMMU_PTE_FILE_SHIFT;
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}
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static inline pte_t pgoff_to_pte(unsigned long pgoff)
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{
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return __pte((pgoff << SRMMU_PTE_FILE_SHIFT) | SRMMU_FILE);
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}
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/*
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* This is made a constant because mm/fremap.c required a constant.
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*/
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#define PTE_FILE_MAX_BITS 24
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/*
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*/
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struct ctx_list {
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struct ctx_list *next;
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struct ctx_list *prev;
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unsigned int ctx_number;
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struct mm_struct *ctx_mm;
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};
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extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
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extern struct ctx_list ctx_free; /* Head of free list */
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extern struct ctx_list ctx_used; /* Head of used contexts list */
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#define NO_CONTEXT -1
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static inline void remove_from_ctx_list(struct ctx_list *entry)
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{
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entry->next->prev = entry->prev;
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entry->prev->next = entry->next;
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}
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static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
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{
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entry->next = head;
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(entry->prev = head->prev)->next = entry;
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head->prev = entry;
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}
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#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
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#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
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static inline unsigned long
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__get_phys (unsigned long addr)
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{
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switch (sparc_cpu_model){
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case sun4m:
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case sun4d:
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return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
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default:
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return 0;
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}
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}
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static inline int
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__get_iospace (unsigned long addr)
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{
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switch (sparc_cpu_model){
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case sun4m:
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case sun4d:
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return (srmmu_get_pte (addr) >> 28);
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default:
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return -1;
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}
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}
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extern unsigned long *sparc_valid_addr_bitmap;
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/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
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#define kern_addr_valid(addr) \
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(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
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/*
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* For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
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* its high 4 bits. These macros/functions put it there or get it from there.
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*/
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#define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
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#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
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#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
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extern int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
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unsigned long, pgprot_t);
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static inline int io_remap_pfn_range(struct vm_area_struct *vma,
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unsigned long from, unsigned long pfn,
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unsigned long size, pgprot_t prot)
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{
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unsigned long long offset, space, phys_base;
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offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
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space = GET_IOSPACE(pfn);
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phys_base = offset | (space << 32ULL);
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return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
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}
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#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
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#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
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({ \
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int __changed = !pte_same(*(__ptep), __entry); \
|
|
if (__changed) { \
|
|
set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
|
|
flush_tlb_page(__vma, __address); \
|
|
} \
|
|
__changed; \
|
|
})
|
|
|
|
#include <asm-generic/pgtable.h>
|
|
|
|
#endif /* !(__ASSEMBLY__) */
|
|
|
|
#define VMALLOC_START _AC(0xfe600000,UL)
|
|
#define VMALLOC_END _AC(0xffc00000,UL)
|
|
|
|
/* We provide our own get_unmapped_area to cope with VA holes for userland */
|
|
#define HAVE_ARCH_UNMAPPED_AREA
|
|
|
|
/*
|
|
* No page table caches to initialise
|
|
*/
|
|
#define pgtable_cache_init() do { } while (0)
|
|
|
|
#endif /* !(_SPARC_PGTABLE_H) */
|