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48 lines
1.2 KiB
48 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) 2005-2017 Andes Technology Corporation |
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#include <linux/export.h> |
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#include <linux/highmem.h> |
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#include <linux/sched.h> |
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#include <linux/smp.h> |
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#include <linux/interrupt.h> |
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#include <linux/memblock.h> |
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#include <asm/fixmap.h> |
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#include <asm/tlbflush.h> |
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void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) |
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{ |
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unsigned int idx; |
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unsigned long vaddr, pte; |
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int type; |
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pte_t *ptep; |
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type = kmap_atomic_idx_push(); |
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idx = type + KM_TYPE_NR * smp_processor_id(); |
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vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); |
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pte = (page_to_pfn(page) << PAGE_SHIFT) | prot; |
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ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); |
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set_pte(ptep, pte); |
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__nds32__tlbop_inv(vaddr); |
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__nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN); |
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__nds32__tlbop_rwr(pte); |
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__nds32__isb(); |
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return (void *)vaddr; |
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} |
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EXPORT_SYMBOL(kmap_atomic_high_prot); |
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void kunmap_atomic_high(void *kvaddr) |
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{ |
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if (kvaddr >= (void *)FIXADDR_START) { |
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unsigned long vaddr = (unsigned long)kvaddr; |
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pte_t *ptep; |
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kmap_atomic_idx_pop(); |
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__nds32__tlbop_inv(vaddr); |
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__nds32__isb(); |
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ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); |
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set_pte(ptep, 0); |
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} |
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} |
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EXPORT_SYMBOL(kunmap_atomic_high);
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