// SPDX-License-Identifier: GPL-2.0-only
|
/*
|
* arch/sh/mm/kmap.c
|
*
|
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
|
* Copyright (C) 2002 - 2009 Paul Mundt
|
*/
|
#include <linux/mm.h>
|
#include <linux/init.h>
|
#include <linux/mutex.h>
|
#include <linux/fs.h>
|
#include <linux/highmem.h>
|
#include <linux/module.h>
|
#include <asm/mmu_context.h>
|
#include <asm/cacheflush.h>
|
|
static pte_t *kmap_coherent_pte;
|
|
void __init kmap_coherent_init(void)
|
{
|
unsigned long vaddr;
|
|
/* cache the first coherent kmap pte */
|
vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
|
kmap_coherent_pte = virt_to_kpte(vaddr);
|
}
|
|
void *kmap_coherent(struct page *page, unsigned long addr)
|
{
|
enum fixed_addresses idx;
|
unsigned long vaddr;
|
|
BUG_ON(!test_bit(PG_dcache_clean, &page->flags));
|
|
preempt_disable();
|
pagefault_disable();
|
|
idx = FIX_CMAP_END -
|
(((addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1)) +
|
(FIX_N_COLOURS * smp_processor_id()));
|
|
vaddr = __fix_to_virt(idx);
|
|
BUG_ON(!pte_none(*(kmap_coherent_pte - idx)));
|
set_pte(kmap_coherent_pte - idx, mk_pte(page, PAGE_KERNEL));
|
|
return (void *)vaddr;
|
}
|
|
void kunmap_coherent(void *kvaddr)
|
{
|
if (kvaddr >= (void *)FIXADDR_START) {
|
unsigned long vaddr = (unsigned long)kvaddr & PAGE_MASK;
|
enum fixed_addresses idx = __virt_to_fix(vaddr);
|
|
/* XXX.. Kill this later, here for sanity at the moment.. */
|
__flush_purge_region((void *)vaddr, PAGE_SIZE);
|
|
pte_clear(&init_mm, vaddr, kmap_coherent_pte - idx);
|
local_flush_tlb_one(get_asid(), vaddr);
|
}
|
|
pagefault_enable();
|
preempt_enable();
|
}
|
