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dvma.c

/*
 * linux/arch/m68k/sun3/dvma.c
 *
 * Written by Sam Creasey
 *
 * Sun3 IOMMU routines used for dvma accesses.
 *
 */

#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];

static 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 = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL);
      pte = pte_val(ptep);
//          printk("dvma_remap: addr %lx -> %lx pte %08lx len %x\n",
//                 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));


}

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