[NET]: add a top-level Networking menu to *config
[linux-2.6.git] / arch / m68k / mm / sun3kmap.c
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/types.h>
12 #include <linux/kernel.h>
13 #include <linux/mm.h>
14 #include <linux/vmalloc.h>
15
16 #include <asm/page.h>
17 #include <asm/pgtable.h>
18 #include <asm/io.h>
19 #include <asm/sun3mmu.h>
20
21 #undef SUN3_KMAP_DEBUG
22
23 #ifdef SUN3_KMAP_DEBUG
24 extern void print_pte_vaddr(unsigned long vaddr);
25 #endif
26
27 extern void mmu_emu_map_pmeg (int context, int vaddr);
28
29 static inline void do_page_mapin(unsigned long phys, unsigned long virt,
30                                  unsigned long type)
31 {
32         unsigned long pte;
33         pte_t ptep;
34
35         ptep = pfn_pte(phys >> PAGE_SHIFT, PAGE_KERNEL);
36         pte = pte_val(ptep);
37         pte |= type;
38
39         sun3_put_pte(virt, pte);
40
41 #ifdef SUN3_KMAP_DEBUG
42         print_pte_vaddr(virt);
43 #endif
44
45 }
46
47 static inline void do_pmeg_mapin(unsigned long phys, unsigned long virt,
48                                  unsigned long type, int pages)
49 {
50
51         if(sun3_get_segmap(virt & ~SUN3_PMEG_MASK) == SUN3_INVALID_PMEG)
52                 mmu_emu_map_pmeg(sun3_get_context(), virt);
53
54         while(pages) {
55                 do_page_mapin(phys, virt, type);
56                 phys += PAGE_SIZE;
57                 virt += PAGE_SIZE;
58                 pages--;
59         }
60 }
61
62 void *sun3_ioremap(unsigned long phys, unsigned long size,
63                    unsigned long type)
64 {
65         struct vm_struct *area;
66         unsigned long offset, virt, ret;
67         int pages;
68
69         if(!size)
70                 return NULL;
71
72         /* page align */
73         offset = phys & (PAGE_SIZE-1);
74         phys &= ~(PAGE_SIZE-1);
75
76         size += offset;
77         size = PAGE_ALIGN(size);
78         if((area = get_vm_area(size, VM_IOREMAP)) == NULL)
79                 return NULL;
80
81 #ifdef SUN3_KMAP_DEBUG
82         printk("ioremap: got virt %p size %lx(%lx)\n",
83                area->addr, size, area->size);
84 #endif
85
86         pages = size / PAGE_SIZE;
87         virt = (unsigned long)area->addr;
88         ret = virt + offset;
89
90         while(pages) {
91                 int seg_pages;
92
93                 seg_pages = (SUN3_PMEG_SIZE - (virt & SUN3_PMEG_MASK)) / PAGE_SIZE;
94                 if(seg_pages > pages)
95                         seg_pages = pages;
96
97                 do_pmeg_mapin(phys, virt, type, seg_pages);
98
99                 pages -= seg_pages;
100                 phys += seg_pages * PAGE_SIZE;
101                 virt += seg_pages * PAGE_SIZE;
102         }
103
104         return (void *)ret;
105
106 }
107
108
109 void *__ioremap(unsigned long phys, unsigned long size, int cache)
110 {
111
112         return sun3_ioremap(phys, size, SUN3_PAGE_TYPE_IO);
113
114 }
115
116 void iounmap(void *addr)
117 {
118         vfree((void *)(PAGE_MASK & (unsigned long)addr));
119 }
120
121 /* sun3_map_test(addr, val) -- Reads a byte from addr, storing to val,
122  * trapping the potential read fault.  Returns 0 if the access faulted,
123  * 1 on success.
124  *
125  * This function is primarily used to check addresses on the VME bus.
126  *
127  * Mucking with the page fault handler seems a little hackish to me, but
128  * SunOS, NetBSD, and Mach all implemented this check in such a manner,
129  * so I figure we're allowed.
130  */
131 int sun3_map_test(unsigned long addr, char *val)
132 {
133         int ret = 0;
134
135         __asm__ __volatile__
136                 (".globl _sun3_map_test_start\n"
137                  "_sun3_map_test_start:\n"
138                  "1: moveb (%2), (%0)\n"
139                  "   moveq #1, %1\n"
140                  "2:\n"
141                  ".section .fixup,\"ax\"\n"
142                  ".even\n"
143                  "3: moveq #0, %1\n"
144                  "   jmp 2b\n"
145                  ".previous\n"
146                  ".section __ex_table,\"a\"\n"
147                  ".align 4\n"
148                  ".long 1b,3b\n"
149                  ".previous\n"
150                  ".globl _sun3_map_test_end\n"
151                  "_sun3_map_test_end:\n"
152                  : "=a"(val), "=r"(ret)
153                  : "a"(addr));
154
155         return ret;
156 }