// 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(struct page *page) { unsigned long vaddr; might_sleep(); if (!PageHighMem(page)) return page_address(page); vaddr = (unsigned long)kmap_high(page); return (void *)vaddr; } EXPORT_SYMBOL(kmap); void kunmap(struct page *page) { BUG_ON(in_interrupt()); if (!PageHighMem(page)) return; kunmap_high(page); } EXPORT_SYMBOL(kunmap); void *kmap_atomic(struct page *page) { unsigned int idx; unsigned long vaddr, pte; int type; pte_t *ptep; preempt_disable(); pagefault_disable(); if (!PageHighMem(page)) return page_address(page); 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) | (PAGE_KERNEL); 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); void __kunmap_atomic(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); } pagefault_enable(); preempt_enable(); } EXPORT_SYMBOL(__kunmap_atomic);