hugetlb: introduce generic version of hugetlb_free_pgd_range
[linux/fpc-iii.git] / arch / m68k / sun3 / dvma.c
blob5f92c72b05c31739b10116ca90b495da600415ac
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/arch/m68k/sun3/dvma.c
5 * Written by Sam Creasey
7 * Sun3 IOMMU routines used for dvma accesses.
9 */
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/mm.h>
14 #include <linux/bootmem.h>
15 #include <linux/list.h>
16 #include <asm/page.h>
17 #include <asm/pgtable.h>
18 #include <asm/sun3mmu.h>
19 #include <asm/dvma.h>
22 static unsigned long ptelist[120];
24 static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
26 unsigned long pte;
27 unsigned long j;
28 pte_t ptep;
30 j = *(volatile unsigned long *)kaddr;
31 *(volatile unsigned long *)kaddr = j;
33 ptep = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL);
34 pte = pte_val(ptep);
35 // pr_info("dvma_remap: addr %lx -> %lx pte %08lx\n", kaddr, vaddr, pte);
36 if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
37 sun3_put_pte(vaddr, pte);
38 ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte;
41 return (vaddr + (kaddr & ~PAGE_MASK));
45 int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
46 int len)
49 unsigned long end;
50 unsigned long vaddr;
52 vaddr = dvma_btov(baddr);
54 end = vaddr + len;
56 while(vaddr < end) {
57 dvma_page(kaddr, vaddr);
58 kaddr += PAGE_SIZE;
59 vaddr += PAGE_SIZE;
62 return 0;
66 void __init sun3_dvma_init(void)
68 memset(ptelist, 0, sizeof(ptelist));