tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/arch/m68k/mm/sun3kmap.c
3 *
4 * Copyright (C) 2002 Sam Creasey <sammy@sammy.net>
5 *
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
8 * for more details.
9 */
10
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/vmalloc.h>
16
17#include <asm/page.h>
18#include <asm/pgtable.h>
19#include <asm/io.h>
20#include <asm/sun3mmu.h>
21
22#undef SUN3_KMAP_DEBUG
23
24#ifdef SUN3_KMAP_DEBUG
25extern void print_pte_vaddr(unsigned long vaddr);
26#endif
27
28extern void mmu_emu_map_pmeg (int context, int vaddr);
29
30static inline void do_page_mapin(unsigned long phys, unsigned long virt,
31 unsigned long type)
32{
33 unsigned long pte;
34 pte_t ptep;
35
36 ptep = pfn_pte(phys >> PAGE_SHIFT, PAGE_KERNEL);
37 pte = pte_val(ptep);
38 pte |= type;
39
40 sun3_put_pte(virt, pte);
41
42#ifdef SUN3_KMAP_DEBUG
43 pr_info("mapin:");
44 print_pte_vaddr(virt);
45#endif
46
47}
48
49static inline void do_pmeg_mapin(unsigned long phys, unsigned long virt,
50 unsigned long type, int pages)
51{
52
53 if(sun3_get_segmap(virt & ~SUN3_PMEG_MASK) == SUN3_INVALID_PMEG)
54 mmu_emu_map_pmeg(sun3_get_context(), virt);
55
56 while(pages) {
57 do_page_mapin(phys, virt, type);
58 phys += PAGE_SIZE;
59 virt += PAGE_SIZE;
60 pages--;
61 }
62}
63
64void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
65 unsigned long type)
66{
67 struct vm_struct *area;
68 unsigned long offset, virt, ret;
69 int pages;
70
71 if(!size)
72 return NULL;
73
74 /* page align */
75 offset = phys & (PAGE_SIZE-1);
76 phys &= ~(PAGE_SIZE-1);
77
78 size += offset;
79 size = PAGE_ALIGN(size);
80 if((area = get_vm_area(size, VM_IOREMAP)) == NULL)
81 return NULL;
82
83#ifdef SUN3_KMAP_DEBUG
84 pr_info("ioremap: got virt %p size %lx(%lx)\n", area->addr, size,
85 area->size);
86#endif
87
88 pages = size / PAGE_SIZE;
89 virt = (unsigned long)area->addr;
90 ret = virt + offset;
91
92 while(pages) {
93 int seg_pages;
94
95 seg_pages = (SUN3_PMEG_SIZE - (virt & SUN3_PMEG_MASK)) / PAGE_SIZE;
96 if(seg_pages > pages)
97 seg_pages = pages;
98
99 do_pmeg_mapin(phys, virt, type, seg_pages);
100
101 pages -= seg_pages;
102 phys += seg_pages * PAGE_SIZE;
103 virt += seg_pages * PAGE_SIZE;
104 }
105
106 return (void __iomem *)ret;
107
108}
109EXPORT_SYMBOL(sun3_ioremap);
110
111
112void __iomem *__ioremap(unsigned long phys, unsigned long size, int cache)
113{
114
115 return sun3_ioremap(phys, size, SUN3_PAGE_TYPE_IO);
116
117}
118EXPORT_SYMBOL(__ioremap);
119
120void iounmap(void __iomem *addr)
121{
122 vfree((void *)(PAGE_MASK & (unsigned long)addr));
123}
124EXPORT_SYMBOL(iounmap);
125
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,
128 * 1 on success.
129 *
130 * This function is primarily used to check addresses on the VME bus.
131 *
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.
135 */
136int sun3_map_test(unsigned long addr, char *val)
137{
138 int ret = 0;
139
140 __asm__ __volatile__
141 (".globl _sun3_map_test_start\n"
142 "_sun3_map_test_start:\n"
143 "1: moveb (%2), (%0)\n"
144 " moveq #1, %1\n"
145 "2:\n"
146 ".section .fixup,\"ax\"\n"
147 ".even\n"
148 "3: moveq #0, %1\n"
149 " jmp 2b\n"
150 ".previous\n"
151 ".section __ex_table,\"a\"\n"
152 ".align 4\n"
153 ".long 1b,3b\n"
154 ".previous\n"
155 ".globl _sun3_map_test_end\n"
156 "_sun3_map_test_end:\n"
157 : "=a"(val), "=r"(ret)
158 : "a"(addr));
159
160 return ret;
161}
162EXPORT_SYMBOL(sun3_map_test);