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