nds32: Cache and TLB routines
This patch contains cache and TLB maintenance functions. Signed-off-by: Vincent Chen <vincentc@andestech.com> Signed-off-by: Greentime Hu <greentime@andestech.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Greentime Hu
322
arch/nds32/mm/cacheflush.c
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322
arch/nds32/mm/cacheflush.c
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/module.h>
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#include <asm/cacheflush.h>
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#include <asm/proc-fns.h>
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#include <asm/shmparam.h>
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#include <asm/cache_info.h>
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extern struct cache_info L1_cache_info[2];
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#ifndef CONFIG_CPU_CACHE_ALIASING
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void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
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pte_t * pte)
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{
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struct page *page;
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unsigned long pfn = pte_pfn(*pte);
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unsigned long flags;
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if (!pfn_valid(pfn))
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return;
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if (vma->vm_mm == current->active_mm) {
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local_irq_save(flags);
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__nds32__mtsr_dsb(addr, NDS32_SR_TLB_VPN);
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__nds32__tlbop_rwr(*pte);
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__nds32__isb();
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local_irq_restore(flags);
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}
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page = pfn_to_page(pfn);
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if ((test_and_clear_bit(PG_dcache_dirty, &page->flags)) ||
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(vma->vm_flags & VM_EXEC)) {
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if (!PageHighMem(page)) {
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cpu_cache_wbinval_page((unsigned long)
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page_address(page),
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vma->vm_flags & VM_EXEC);
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} else {
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unsigned long kaddr = (unsigned long)kmap_atomic(page);
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cpu_cache_wbinval_page(kaddr, vma->vm_flags & VM_EXEC);
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kunmap_atomic((void *)kaddr);
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}
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}
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}
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#else
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extern pte_t va_present(struct mm_struct *mm, unsigned long addr);
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static inline unsigned long aliasing(unsigned long addr, unsigned long page)
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{
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return ((addr & PAGE_MASK) ^ page) & (SHMLBA - 1);
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}
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static inline unsigned long kremap0(unsigned long uaddr, unsigned long pa)
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{
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unsigned long kaddr, pte;
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#define BASE_ADDR0 0xffffc000
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kaddr = BASE_ADDR0 | (uaddr & L1_cache_info[DCACHE].aliasing_mask);
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pte = (pa | PAGE_KERNEL);
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__nds32__mtsr_dsb(kaddr, NDS32_SR_TLB_VPN);
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__nds32__tlbop_rwlk(pte);
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__nds32__isb();
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return kaddr;
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}
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static inline void kunmap01(unsigned long kaddr)
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{
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__nds32__tlbop_unlk(kaddr);
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__nds32__tlbop_inv(kaddr);
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__nds32__isb();
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}
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static inline unsigned long kremap1(unsigned long uaddr, unsigned long pa)
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{
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unsigned long kaddr, pte;
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#define BASE_ADDR1 0xffff8000
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kaddr = BASE_ADDR1 | (uaddr & L1_cache_info[DCACHE].aliasing_mask);
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pte = (pa | PAGE_KERNEL);
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__nds32__mtsr_dsb(kaddr, NDS32_SR_TLB_VPN);
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__nds32__tlbop_rwlk(pte);
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__nds32__isb();
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return kaddr;
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}
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void flush_cache_mm(struct mm_struct *mm)
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{
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unsigned long flags;
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local_irq_save(flags);
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cpu_dcache_wbinval_all();
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cpu_icache_inval_all();
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local_irq_restore(flags);
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}
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void flush_cache_dup_mm(struct mm_struct *mm)
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{
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}
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void flush_cache_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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unsigned long flags;
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if ((end - start) > 8 * PAGE_SIZE) {
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cpu_dcache_wbinval_all();
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if (vma->vm_flags & VM_EXEC)
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cpu_icache_inval_all();
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return;
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}
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local_irq_save(flags);
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while (start < end) {
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if (va_present(vma->vm_mm, start))
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cpu_cache_wbinval_page(start, vma->vm_flags & VM_EXEC);
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start += PAGE_SIZE;
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}
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local_irq_restore(flags);
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return;
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}
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void flush_cache_page(struct vm_area_struct *vma,
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unsigned long addr, unsigned long pfn)
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{
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unsigned long vto, flags;
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local_irq_save(flags);
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vto = kremap0(addr, pfn << PAGE_SHIFT);
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cpu_cache_wbinval_page(vto, vma->vm_flags & VM_EXEC);
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kunmap01(vto);
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local_irq_restore(flags);
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}
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void flush_cache_vmap(unsigned long start, unsigned long end)
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{
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cpu_dcache_wbinval_all();
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cpu_icache_inval_all();
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}
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void flush_cache_vunmap(unsigned long start, unsigned long end)
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{
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cpu_dcache_wbinval_all();
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cpu_icache_inval_all();
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}
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void copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma)
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{
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unsigned long vto, vfrom, flags, kto, kfrom, pfrom, pto;
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kto = ((unsigned long)page_address(to) & PAGE_MASK);
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kfrom = ((unsigned long)page_address(from) & PAGE_MASK);
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pto = page_to_phys(to);
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pfrom = page_to_phys(from);
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if (aliasing(vaddr, (unsigned long)kfrom))
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cpu_dcache_wb_page((unsigned long)kfrom);
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if (aliasing(vaddr, (unsigned long)kto))
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cpu_dcache_inval_page((unsigned long)kto);
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local_irq_save(flags);
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vto = kremap0(vaddr, pto);
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vfrom = kremap1(vaddr, pfrom);
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copy_page((void *)vto, (void *)vfrom);
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kunmap01(vfrom);
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kunmap01(vto);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(copy_user_highpage);
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void clear_user_highpage(struct page *page, unsigned long vaddr)
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{
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unsigned long vto, flags, kto;
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kto = ((unsigned long)page_address(page) & PAGE_MASK);
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local_irq_save(flags);
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if (aliasing(kto, vaddr) && kto != 0) {
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cpu_dcache_inval_page(kto);
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cpu_icache_inval_page(kto);
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}
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vto = kremap0(vaddr, page_to_phys(page));
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clear_page((void *)vto);
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kunmap01(vto);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(clear_user_highpage);
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void flush_dcache_page(struct page *page)
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{
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struct address_space *mapping;
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mapping = page_mapping(page);
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if (mapping && !mapping_mapped(mapping))
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set_bit(PG_dcache_dirty, &page->flags);
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else {
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int i, pc;
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unsigned long vto, kaddr, flags;
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kaddr = (unsigned long)page_address(page);
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cpu_dcache_wbinval_page(kaddr);
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pc = CACHE_SET(DCACHE) * CACHE_LINE_SIZE(DCACHE) / PAGE_SIZE;
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local_irq_save(flags);
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for (i = 0; i < pc; i++) {
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vto =
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kremap0(kaddr + i * PAGE_SIZE, page_to_phys(page));
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cpu_dcache_wbinval_page(vto);
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kunmap01(vto);
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}
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local_irq_restore(flags);
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}
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}
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void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
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unsigned long vaddr, void *dst, void *src, int len)
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{
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unsigned long line_size, start, end, vto, flags;
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local_irq_save(flags);
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vto = kremap0(vaddr, page_to_phys(page));
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dst = (void *)(vto | (vaddr & (PAGE_SIZE - 1)));
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memcpy(dst, src, len);
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if (vma->vm_flags & VM_EXEC) {
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line_size = L1_cache_info[DCACHE].line_size;
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start = (unsigned long)dst & ~(line_size - 1);
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end =
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((unsigned long)dst + len + line_size - 1) & ~(line_size -
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1);
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cpu_cache_wbinval_range(start, end, 1);
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}
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kunmap01(vto);
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local_irq_restore(flags);
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}
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void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
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unsigned long vaddr, void *dst, void *src, int len)
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{
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unsigned long vto, flags;
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local_irq_save(flags);
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vto = kremap0(vaddr, page_to_phys(page));
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src = (void *)(vto | (vaddr & (PAGE_SIZE - 1)));
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memcpy(dst, src, len);
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kunmap01(vto);
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local_irq_restore(flags);
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}
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void flush_anon_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr)
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{
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unsigned long flags;
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if (!PageAnon(page))
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return;
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if (vma->vm_mm != current->active_mm)
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return;
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local_irq_save(flags);
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if (vma->vm_flags & VM_EXEC)
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cpu_icache_inval_page(vaddr & PAGE_MASK);
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cpu_dcache_wbinval_page((unsigned long)page_address(page));
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local_irq_restore(flags);
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}
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void flush_kernel_dcache_page(struct page *page)
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{
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unsigned long flags;
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local_irq_save(flags);
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cpu_dcache_wbinval_page((unsigned long)page_address(page));
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local_irq_restore(flags);
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}
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void flush_icache_range(unsigned long start, unsigned long end)
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{
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unsigned long line_size, flags;
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line_size = L1_cache_info[DCACHE].line_size;
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start = start & ~(line_size - 1);
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end = (end + line_size - 1) & ~(line_size - 1);
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local_irq_save(flags);
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cpu_cache_wbinval_range(start, end, 1);
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local_irq_restore(flags);
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}
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void flush_icache_page(struct vm_area_struct *vma, struct page *page)
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{
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unsigned long flags;
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local_irq_save(flags);
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cpu_cache_wbinval_page((unsigned long)page_address(page),
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vma->vm_flags & VM_EXEC);
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local_irq_restore(flags);
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}
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void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
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pte_t * pte)
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{
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struct page *page;
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unsigned long flags;
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unsigned long pfn = pte_pfn(*pte);
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if (!pfn_valid(pfn))
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return;
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if (vma->vm_mm == current->active_mm) {
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local_irq_save(flags);
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__nds32__mtsr_dsb(addr, NDS32_SR_TLB_VPN);
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__nds32__tlbop_rwr(*pte);
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__nds32__isb();
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local_irq_restore(flags);
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}
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page = pfn_to_page(pfn);
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if (test_and_clear_bit(PG_dcache_dirty, &page->flags) ||
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(vma->vm_flags & VM_EXEC)) {
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local_irq_save(flags);
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cpu_dcache_wbinval_page((unsigned long)page_address(page));
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local_irq_restore(flags);
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}
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}
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#endif
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