arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / nds32 / mm / highmem.c
blob022779af6148ca671f32f8d080c57540ed0d4ee0
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>
7 #include <linux/smp.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)
15 unsigned long vaddr;
16 might_sleep();
17 if (!PageHighMem(page))
18 return page_address(page);
19 vaddr = (unsigned long)kmap_high(page);
20 return (void *)vaddr;
23 EXPORT_SYMBOL(kmap);
25 void kunmap(struct page *page)
27 BUG_ON(in_interrupt());
28 if (!PageHighMem(page))
29 return;
30 kunmap_high(page);
33 EXPORT_SYMBOL(kunmap);
35 void *kmap_atomic(struct page *page)
37 unsigned int idx;
38 unsigned long vaddr, pte;
39 int type;
40 pte_t *ptep;
42 preempt_disable();
43 pagefault_disable();
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);
53 set_pte(ptep, pte);
55 __nds32__tlbop_inv(vaddr);
56 __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN);
57 __nds32__tlbop_rwr(pte);
58 __nds32__isb();
59 return (void *)vaddr;
62 EXPORT_SYMBOL(kmap_atomic);
64 void __kunmap_atomic(void *kvaddr)
66 if (kvaddr >= (void *)FIXADDR_START) {
67 unsigned long vaddr = (unsigned long)kvaddr;
68 pte_t *ptep;
69 kmap_atomic_idx_pop();
70 __nds32__tlbop_inv(vaddr);
71 __nds32__isb();
72 ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
73 set_pte(ptep, 0);
75 pagefault_enable();
76 preempt_enable();
79 EXPORT_SYMBOL(__kunmap_atomic);