// SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2005-2017 Andes Technology Corporation #include <linux/export.h> #include <linux/highmem.h> #include <linux/sched.h> #include <linux/smp.h> #include <linux/interrupt.h> #include <linux/memblock.h> #include <asm/fixmap.h> #include <asm/tlbflush.h> void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { unsigned int idx; unsigned long vaddr, pte; int type; pte_t *ptep; type = kmap_atomic_idx_push(); idx = type + KM_TYPE_NR * smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); pte = (page_to_pfn(page) << PAGE_SHIFT) | prot; ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); set_pte(ptep, pte); __nds32__tlbop_inv(vaddr); __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN); __nds32__tlbop_rwr(pte); __nds32__isb(); return (void *)vaddr; } EXPORT_SYMBOL(kmap_atomic_high_prot); void kunmap_atomic_high(void *kvaddr) { if (kvaddr >= (void *)FIXADDR_START) { unsigned long vaddr = (unsigned long)kvaddr; pte_t *ptep; kmap_atomic_idx_pop(); __nds32__tlbop_inv(vaddr); __nds32__isb(); ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); set_pte(ptep, 0); } } EXPORT_SYMBOL(kunmap_atomic_high);