forked from ~ljy/RK356X_SDK_RELEASE

hc
2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01
kernel/arch/nds32/mm/highmem.c
....@@ -0,0 +1,48 @@
1
+// SPDX-License-Identifier: GPL-2.0
2
+// Copyright (C) 2005-2017 Andes Technology Corporation
3
+
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>
12
+
13
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
14
+{
15
+ unsigned int idx;
16
+ unsigned long vaddr, pte;
17
+ int type;
18
+ pte_t *ptep;
19
+
20
+ type = kmap_atomic_idx_push();
21
+
22
+ idx = type + KM_TYPE_NR * smp_processor_id();
23
+ vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
24
+ pte = (page_to_pfn(page) << PAGE_SHIFT) | prot;
25
+ ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
26
+ set_pte(ptep, pte);
27
+
28
+ __nds32__tlbop_inv(vaddr);
29
+ __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN);
30
+ __nds32__tlbop_rwr(pte);
31
+ __nds32__isb();
32
+ return (void *)vaddr;
33
+}
34
+EXPORT_SYMBOL(kmap_atomic_high_prot);
35
+
36
+void kunmap_atomic_high(void *kvaddr)
37
+{
38
+ if (kvaddr >= (void *)FIXADDR_START) {
39
+ unsigned long vaddr = (unsigned long)kvaddr;
40
+ pte_t *ptep;
41
+ kmap_atomic_idx_pop();
42
+ __nds32__tlbop_inv(vaddr);
43
+ __nds32__isb();
44
+ ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
45
+ set_pte(ptep, 0);
46
+ }
47
+}
48
+EXPORT_SYMBOL(kunmap_atomic_high);