1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * arch/sh/mm/kmap.c
 4 *
 5 * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
 6 * Copyright (C) 2002 - 2009  Paul Mundt
 7 */
 8#include <linux/mm.h>
 9#include <linux/init.h>
10#include <linux/mutex.h>
11#include <linux/fs.h>
12#include <linux/highmem.h>
13#include <linux/module.h>
14#include <asm/mmu_context.h>
15#include <asm/cacheflush.h>
16
17#define kmap_get_fixmap_pte(vaddr)                                     \
18	pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
19
20static pte_t *kmap_coherent_pte;
21
22void __init kmap_coherent_init(void)
23{
24	unsigned long vaddr;
25
26	/* cache the first coherent kmap pte */
27	vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
28	kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
29}
30
31void *kmap_coherent(struct page *page, unsigned long addr)
32{
 
33	enum fixed_addresses idx;
34	unsigned long vaddr;
35
36	BUG_ON(!test_bit(PG_dcache_clean, &page->flags));
37
38	preempt_disable();
39	pagefault_disable();
40
41	idx = FIX_CMAP_END -
42		(((addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1)) +
43		 (FIX_N_COLOURS * smp_processor_id()));
44
45	vaddr = __fix_to_virt(idx);
46
47	BUG_ON(!pte_none(*(kmap_coherent_pte - idx)));
48	set_pte(kmap_coherent_pte - idx, mk_pte(page, PAGE_KERNEL));
49
50	return (void *)vaddr;
51}
52
53void kunmap_coherent(void *kvaddr)
54{
55	if (kvaddr >= (void *)FIXADDR_START) {
56		unsigned long vaddr = (unsigned long)kvaddr & PAGE_MASK;
57		enum fixed_addresses idx = __virt_to_fix(vaddr);
58
59		/* XXX.. Kill this later, here for sanity at the moment.. */
60		__flush_purge_region((void *)vaddr, PAGE_SIZE);
61
62		pte_clear(&init_mm, vaddr, kmap_coherent_pte - idx);
63		local_flush_tlb_one(get_asid(), vaddr);
64	}
65
66	pagefault_enable();
67	preempt_enable();
68}

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * arch/sh/mm/kmap.c
 4 *
 5 * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
 6 * Copyright (C) 2002 - 2009  Paul Mundt
 7 */
 8#include <linux/mm.h>
 9#include <linux/init.h>
10#include <linux/mutex.h>
11#include <linux/fs.h>
12#include <linux/highmem.h>
13#include <linux/module.h>
14#include <asm/mmu_context.h>
15#include <asm/cacheflush.h>
16
 
 
 
17static pte_t *kmap_coherent_pte;
18
19void __init kmap_coherent_init(void)
20{
21	unsigned long vaddr;
22
23	/* cache the first coherent kmap pte */
24	vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
25	kmap_coherent_pte = virt_to_kpte(vaddr);
26}
27
28void *kmap_coherent(struct page *page, unsigned long addr)
29{
30	struct folio *folio = page_folio(page);
31	enum fixed_addresses idx;
32	unsigned long vaddr;
33
34	BUG_ON(!test_bit(PG_dcache_clean, &folio->flags));
35
36	preempt_disable();
37	pagefault_disable();
38
39	idx = FIX_CMAP_END -
40		(((addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1)) +
41		 (FIX_N_COLOURS * smp_processor_id()));
42
43	vaddr = __fix_to_virt(idx);
44
45	BUG_ON(!pte_none(*(kmap_coherent_pte - idx)));
46	set_pte(kmap_coherent_pte - idx, mk_pte(page, PAGE_KERNEL));
47
48	return (void *)vaddr;
49}
50
51void kunmap_coherent(void *kvaddr)
52{
53	if (kvaddr >= (void *)FIXADDR_START) {
54		unsigned long vaddr = (unsigned long)kvaddr & PAGE_MASK;
55		enum fixed_addresses idx = __virt_to_fix(vaddr);
56
57		/* XXX.. Kill this later, here for sanity at the moment.. */
58		__flush_purge_region((void *)vaddr, PAGE_SIZE);
59
60		pte_clear(&init_mm, vaddr, kmap_coherent_pte - idx);
61		local_flush_tlb_one(get_asid(), vaddr);
62	}
63
64	pagefault_enable();
65	preempt_enable();
66}