2 * linux/arch/m68k/mm/sun3kmap.c
4 * Copyright (C) 2002 Sam Creasey <sammy@sammy.net>
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
15 #include <linux/vmalloc.h>
18 #include <asm/pgtable.h>
20 #include <asm/sun3mmu.h>
22 #undef SUN3_KMAP_DEBUG
24 #ifdef SUN3_KMAP_DEBUG
25 extern void print_pte_vaddr(unsigned long vaddr);
28 extern void mmu_emu_map_pmeg (int context, int vaddr);
30 static inline void do_page_mapin(unsigned long phys, unsigned long virt,
36 ptep = pfn_pte(phys >> PAGE_SHIFT, PAGE_KERNEL);
40 sun3_put_pte(virt, pte);
42 #ifdef SUN3_KMAP_DEBUG
44 print_pte_vaddr(virt);
49 static inline void do_pmeg_mapin(unsigned long phys, unsigned long virt,
50 unsigned long type, int pages)
53 if(sun3_get_segmap(virt & ~SUN3_PMEG_MASK) == SUN3_INVALID_PMEG)
54 mmu_emu_map_pmeg(sun3_get_context(), virt);
57 do_page_mapin(phys, virt, type);
64 void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
67 struct vm_struct *area;
68 unsigned long offset, virt, ret;
75 offset = phys & (PAGE_SIZE-1);
76 phys &= ~(PAGE_SIZE-1);
79 size = PAGE_ALIGN(size);
80 if((area = get_vm_area(size, VM_IOREMAP)) == NULL)
83 #ifdef SUN3_KMAP_DEBUG
84 pr_info("ioremap: got virt %p size %lx(%lx)\n", area->addr, size,
88 pages = size / PAGE_SIZE;
89 virt = (unsigned long)area->addr;
95 seg_pages = (SUN3_PMEG_SIZE - (virt & SUN3_PMEG_MASK)) / PAGE_SIZE;
99 do_pmeg_mapin(phys, virt, type, seg_pages);
102 phys += seg_pages * PAGE_SIZE;
103 virt += seg_pages * PAGE_SIZE;
106 return (void __iomem *)ret;
109 EXPORT_SYMBOL(sun3_ioremap);
112 void __iomem *__ioremap(unsigned long phys, unsigned long size, int cache)
115 return sun3_ioremap(phys, size, SUN3_PAGE_TYPE_IO);
118 EXPORT_SYMBOL(__ioremap);
120 void iounmap(void __iomem *addr)
122 vfree((void *)(PAGE_MASK & (unsigned long)addr));
124 EXPORT_SYMBOL(iounmap);
126 /* sun3_map_test(addr, val) -- Reads a byte from addr, storing to val,
127 * trapping the potential read fault. Returns 0 if the access faulted,
130 * This function is primarily used to check addresses on the VME bus.
132 * Mucking with the page fault handler seems a little hackish to me, but
133 * SunOS, NetBSD, and Mach all implemented this check in such a manner,
134 * so I figure we're allowed.
136 int sun3_map_test(unsigned long addr, char *val)
141 (".globl _sun3_map_test_start\n"
142 "_sun3_map_test_start:\n"
143 "1: moveb (%2), (%0)\n"
146 ".section .fixup,\"ax\"\n"
151 ".section __ex_table,\"a\"\n"
155 ".globl _sun3_map_test_end\n"
156 "_sun3_map_test_end:\n"
157 : "=a"(val), "=r"(ret)
162 EXPORT_SYMBOL(sun3_map_test);