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| 1 | +// SPDX-License-Identifier: GPL-2.0 |
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| 2 | +// Copyright (C) 2005-2017 Andes Technology Corporation |
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| 3 | + |
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| 4 | +#include <linux/export.h> |
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| 5 | +#include <linux/highmem.h> |
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| 6 | +#include <linux/sched.h> |
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| 7 | +#include <linux/smp.h> |
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| 8 | +#include <linux/interrupt.h> |
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| 9 | +#include <linux/memblock.h> |
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| 10 | +#include <asm/fixmap.h> |
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| 11 | +#include <asm/tlbflush.h> |
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| 12 | + |
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| 13 | +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) |
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| 14 | +{ |
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| 15 | + unsigned int idx; |
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| 16 | + unsigned long vaddr, pte; |
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| 17 | + int type; |
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| 18 | + pte_t *ptep; |
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| 19 | + |
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| 20 | + type = kmap_atomic_idx_push(); |
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| 21 | + |
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| 22 | + idx = type + KM_TYPE_NR * smp_processor_id(); |
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| 23 | + vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); |
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| 24 | + pte = (page_to_pfn(page) << PAGE_SHIFT) | prot; |
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| 25 | + ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); |
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| 26 | + set_pte(ptep, pte); |
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| 27 | + |
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| 28 | + __nds32__tlbop_inv(vaddr); |
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| 29 | + __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN); |
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| 30 | + __nds32__tlbop_rwr(pte); |
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| 31 | + __nds32__isb(); |
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| 32 | + return (void *)vaddr; |
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| 33 | +} |
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| 34 | +EXPORT_SYMBOL(kmap_atomic_high_prot); |
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| 35 | + |
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| 36 | +void kunmap_atomic_high(void *kvaddr) |
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| 37 | +{ |
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| 38 | + if (kvaddr >= (void *)FIXADDR_START) { |
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| 39 | + unsigned long vaddr = (unsigned long)kvaddr; |
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| 40 | + pte_t *ptep; |
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| 41 | + kmap_atomic_idx_pop(); |
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| 42 | + __nds32__tlbop_inv(vaddr); |
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| 43 | + __nds32__isb(); |
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| 44 | + ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); |
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| 45 | + set_pte(ptep, 0); |
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| 46 | + } |
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| 47 | +} |
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| 48 | +EXPORT_SYMBOL(kunmap_atomic_high); |
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