dvma.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:1k
- /* dvma support routines */
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/bootmem.h>
- #include <linux/list.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/sun3mmu.h>
- #include <asm/dvma.h>
- static unsigned long ptelist[120];
- inline unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
- {
- unsigned long pte;
- unsigned long j;
- pte_t ptep;
-
- j = *(volatile unsigned long *)kaddr;
- *(volatile unsigned long *)kaddr = j;
- ptep = __mk_pte(kaddr, PAGE_KERNEL);
- pte = pte_val(ptep);
- // printk("dvma_remap: addr %lx -> %lx pte %08lx len %xn",
- // kaddr, vaddr, pte, len);
- if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
- sun3_put_pte(vaddr, pte);
- ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte;
- }
- return (vaddr + (kaddr & ~PAGE_MASK));
- }
- int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
- int len)
- {
- unsigned long end;
- unsigned long vaddr;
- vaddr = dvma_btov(baddr);
- end = vaddr + len;
-
- while(vaddr < end) {
- dvma_page(kaddr, vaddr);
- kaddr += PAGE_SIZE;
- vaddr += PAGE_SIZE;
- }
- return 0;
- }
- void sun3_dvma_init(void)
- {
- memset(ptelist, 0, sizeof(ptelist));
- }