1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2005-2017 Andes Technology Corporation
4 #include <linux/export.h>
5 #include <linux/highmem.h>
6 #include <linux/sched.h>
8 #include <linux/interrupt.h>
9 #include <linux/memblock.h>
10 #include <asm/fixmap.h>
11 #include <asm/tlbflush.h>
13 void *kmap(struct page *page)
17 if (!PageHighMem(page))
18 return page_address(page);
19 vaddr = (unsigned long)kmap_high(page);
25 void kunmap(struct page *page)
27 BUG_ON(in_interrupt());
28 if (!PageHighMem(page))
33 EXPORT_SYMBOL(kunmap);
35 void *kmap_atomic(struct page *page)
38 unsigned long vaddr, pte;
44 if (!PageHighMem(page))
45 return page_address(page);
47 type = kmap_atomic_idx_push();
49 idx = type + KM_TYPE_NR * smp_processor_id();
50 vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
51 pte = (page_to_pfn(page) << PAGE_SHIFT) | (PAGE_KERNEL);
52 ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
55 __nds32__tlbop_inv(vaddr);
56 __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN);
57 __nds32__tlbop_rwr(pte);
62 EXPORT_SYMBOL(kmap_atomic);
64 void __kunmap_atomic(void *kvaddr)
66 if (kvaddr >= (void *)FIXADDR_START) {
67 unsigned long vaddr = (unsigned long)kvaddr;
69 kmap_atomic_idx_pop();
70 __nds32__tlbop_inv(vaddr);
72 ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
79 EXPORT_SYMBOL(__kunmap_atomic);