projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 59fd53cd GH |
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/bootmem.h> | |
| 10 | #include <asm/fixmap.h> | |
| 11 | #include <asm/tlbflush.h> | |
| 12 | ||
| 13 | void *kmap(struct page *page) | |
| 14 | { | |
| 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; | |
| 21 | } | |
| 22 | ||
| 23 | EXPORT_SYMBOL(kmap); | |
| 24 | ||
| 25 | void kunmap(struct page *page) | |
| 26 | { | |
| 27 | BUG_ON(in_interrupt()); | |
| 28 | if (!PageHighMem(page)) | |
| 29 | return; | |
| 30 | kunmap_high(page); | |
| 31 | } | |
| 32 | ||
| 33 | EXPORT_SYMBOL(kunmap); | |
| 34 | ||
| 35 | void *kmap_atomic(struct page *page) | |
| 36 | { | |
| 37 | unsigned int idx; | |
| 38 | unsigned long vaddr, pte; | |
| 39 | int type; | |
| 40 | pte_t *ptep; | |
| 41 | ||
| 42 | preempt_disable(); | |
| 43 | pagefault_disable(); | |
| 44 | if (!PageHighMem(page)) | |
| 45 | return page_address(page); | |
| 46 | ||
| 47 | type = kmap_atomic_idx_push(); | |
| 48 | ||
| 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); | |
| 54 | ||
| 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; | |
| 60 | } | |
| 61 | ||
| 62 | EXPORT_SYMBOL(kmap_atomic); | |
| 63 | ||
| 64 | void __kunmap_atomic(void *kvaddr) | |
| 65 | { | |
| 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); | |
| 74 | } | |
| 75 | pagefault_enable(); | |
| 76 | preempt_enable(); | |
| 77 | } | |
| 78 | ||
| 79 | EXPORT_SYMBOL(__kunmap_atomic); |