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/arch/m68k/sun3/dvma.c

https://bitbucket.org/evzijst/gittest
C | 71 lines | 42 code | 19 blank | 10 comment | 2 complexity | 7b14fd3b5cad778b95f2207a318d6028 MD5 | raw file
 1/*
 2 * linux/arch/m68k/sun3/dvma.c
 3 *
 4 * Written by Sam Creasey
 5 *
 6 * Sun3 IOMMU routines used for dvma accesses.
 7 *
 8 */
 9
10#include <linux/kernel.h>
11#include <linux/mm.h>
12#include <linux/bootmem.h>
13#include <linux/list.h>
14#include <asm/page.h>
15#include <asm/pgtable.h>
16#include <asm/sun3mmu.h>
17#include <asm/dvma.h>
18
19
20static unsigned long ptelist[120];
21
22inline unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
23{
24	unsigned long pte;
25	unsigned long j;
26	pte_t ptep;
27
28	j = *(volatile unsigned long *)kaddr;
29	*(volatile unsigned long *)kaddr = j;
30
31	ptep = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL);
32	pte = pte_val(ptep);
33//		printk("dvma_remap: addr %lx -> %lx pte %08lx len %x\n",
34//		       kaddr, vaddr, pte, len);
35	if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
36		sun3_put_pte(vaddr, pte);
37		ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte;
38	}
39
40	return (vaddr + (kaddr & ~PAGE_MASK));
41
42}
43
44int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
45			      int len)
46{
47
48	unsigned long end;
49	unsigned long vaddr;
50
51	vaddr = dvma_btov(baddr);
52
53	end = vaddr + len;
54
55	while(vaddr < end) {
56		dvma_page(kaddr, vaddr);
57		kaddr += PAGE_SIZE;
58		vaddr += PAGE_SIZE;
59	}
60
61	return 0;
62
63}
64
65void sun3_dvma_init(void)
66{
67
68	memset(ptelist, 0, sizeof(ptelist));
69
70
71}