void __kunmap_atomic(void *kvaddr)
{
unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
int idx, type;
if (kvaddr >= (void *)FIXADDR_START) {
type = kmap_atomic_idx();
idx = type + KM_TYPE_NR * smp_processor_id();
if (cache_is_vivt())
__cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
set_pte_ext(TOP_PTE(vaddr), __pte(0), 0);
local_flush_tlb_kernel_page(vaddr);
#else
(void) idx; /* to kill a warning */
#endif
kmap_atomic_idx_pop();
} else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) {
/* this address was obtained through kmap_high_get() */
kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)]));
}
pagefault_enable();
}
void __kunmap(struct page *page)
{
BUG_ON(in_interrupt());
if (!PageHighMem(page))
return;
kunmap_high(page);
}
void kunmap(struct page *page)
{
if (in_interrupt())
BUG();
if (!PageHighMem(page))
return;
kunmap_high(page);
}
void kunmap(struct page *page)
{
if (in_interrupt())
BUG();
if (page < highmem_start_page)
return;
kunmap_high(page);
}
void kunmap(struct page *page)
{
BUG_ON(in_interrupt());
//POS (Cheolhee Lee)
if (!(PageHighMem(page) || PageNVRAM(page)))
return;
kunmap_high(page);
}
static void dma_cache_maint_page(struct page *page, unsigned long offset,
size_t size, enum dma_data_direction dir,
void (*op)(const void *, size_t, int))
{
/*
* A single sg entry may refer to multiple physically contiguous
* pages. But we still need to process highmem pages individually.
* If highmem is not configured then the bulk of this loop gets
* optimized out.
*/
size_t left = size;
do {
size_t len = left;
void *vaddr;
if (PageHighMem(page)) {
if (len + offset > PAGE_SIZE) {
if (offset >= PAGE_SIZE) {
page += offset / PAGE_SIZE;
offset %= PAGE_SIZE;
}
len = PAGE_SIZE - offset;
}
vaddr = kmap_high_get(page);
if (vaddr) {
vaddr += offset;
op(vaddr, len, dir);
kunmap_high(page);
} else if (cache_is_vipt()) {
pte_t saved_pte;
vaddr = kmap_high_l1_vipt(page, &saved_pte);
if(vaddr) //TI
{ //TI
op(vaddr + offset, len, dir);
kunmap_high_l1_vipt(page, saved_pte);
}else //TI
printk(KERN_ERR "SSN: 1 vaddr is NULL\n");//TI
}
else //TI
printk(KERN_ERR "SSN: 2 vaddr is NULL\n"); //TI
} else {
vaddr = page_address(page) + offset;
if(vaddr) //TI
op(vaddr, len, dir);
else //TI
printk(KERN_ERR "SSN: 3 vaddr is NULL\n"); //TI
}
offset = 0;
page++;
left -= len;
} while (left);
}
void __exit kmap_high_exit(void)
{
if(pages)
{
kunmap_high(pages); //解除高端内存页到内核的映射
printk("<0>kunmap_high succeed!\n");
__free_pages(pages,0); //释放由alloc_pages( )函数所分配的高端页
printk("<0>__free_pages ok!\n");
}
printk("<0>exit ok!\n");
}
static void dma_cache_maint_page(struct page *page, unsigned long offset,
size_t size, enum dma_data_direction dir,
void (*op)(const void *, size_t, int))
{
unsigned long pfn;
size_t left = size;
pfn = page_to_pfn(page) + offset / PAGE_SIZE;
offset %= PAGE_SIZE;
/*
* A single sg entry may refer to multiple physically contiguous
* pages. But we still need to process highmem pages individually.
* If highmem is not configured then the bulk of this loop gets
* optimized out.
*/
/* size_t left = size; */
do {
size_t len = left;
void *vaddr;
page = pfn_to_page(pfn);
if (PageHighMem(page)) {
/* if (len + offset > PAGE_SIZE) {
if (offset >= PAGE_SIZE) {
page += offset / PAGE_SIZE;
offset %= PAGE_SIZE;
} */
if (len + offset > PAGE_SIZE)
len = PAGE_SIZE - offset;
/* } */
vaddr = kmap_high_get(page);
if (vaddr) {
vaddr += offset;
op(vaddr, len, dir);
kunmap_high(page);
} else if (cache_is_vipt()) {
/* unmapped pages might still be cached */
vaddr = kmap_atomic(page);
op(vaddr + offset, len, dir);
kunmap_atomic(vaddr);
}
} else {
vaddr = page_address(page) + offset;
op(vaddr, len, dir);
}
offset = 0;
/* page++; */
pfn++;
left -= len;
} while (left);
}
/**
* 撤销先前由kmap建立的永久内核映射
*/
void kunmap(struct page *page)
{
/**
* kmap和kunmap都不允许在中断中使用。
*/
if (in_interrupt())
BUG();
/**
* 如果对应页根本就不是高端内存，当然就没有进行内核映射，也就不用调用本函数了。
*/
if (!PageHighMem(page))
return;
/**
* kunmap_high真正执行unmap过程
*/
kunmap_high(page);
}