It wasn't just x86-64 that had hardcoded VM_FAULT_xxx numbers
[linux-2.6.git] / arch / parisc / mm / ioremap.c
1 /*
2  * arch/parisc/mm/ioremap.c
3  *
4  * Re-map IO memory to kernel address space so that we can access it.
5  * This is needed for high PCI addresses that aren't mapped in the
6  * 640k-1MB IO memory area on PC's
7  *
8  * (C) Copyright 1995 1996 Linus Torvalds
9  * (C) Copyright 2001 Helge Deller <deller@gmx.de>
10  */
11
12 #include <linux/vmalloc.h>
13 #include <linux/errno.h>
14 #include <linux/module.h>
15 #include <asm/io.h>
16 #include <asm/pgalloc.h>
17
18 static inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
19         unsigned long phys_addr, unsigned long flags)
20 {
21         unsigned long end;
22
23         address &= ~PMD_MASK;
24         end = address + size;
25         if (end > PMD_SIZE)
26                 end = PMD_SIZE;
27         if (address >= end)
28                 BUG();
29         do {
30                 if (!pte_none(*pte)) {
31                         printk(KERN_ERR "remap_area_pte: page already exists\n");
32                         BUG();
33                 }
34                 set_pte(pte, mk_pte_phys(phys_addr, __pgprot(_PAGE_PRESENT | _PAGE_RW | 
35                                         _PAGE_DIRTY | _PAGE_ACCESSED | flags)));
36                 address += PAGE_SIZE;
37                 phys_addr += PAGE_SIZE;
38                 pte++;
39         } while (address && (address < end));
40 }
41
42 static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
43         unsigned long phys_addr, unsigned long flags)
44 {
45         unsigned long end;
46
47         address &= ~PGDIR_MASK;
48         end = address + size;
49         if (end > PGDIR_SIZE)
50                 end = PGDIR_SIZE;
51         phys_addr -= address;
52         if (address >= end)
53                 BUG();
54         do {
55                 pte_t * pte = pte_alloc_kernel(NULL, pmd, address);
56                 if (!pte)
57                         return -ENOMEM;
58                 remap_area_pte(pte, address, end - address, address + phys_addr, flags);
59                 address = (address + PMD_SIZE) & PMD_MASK;
60                 pmd++;
61         } while (address && (address < end));
62         return 0;
63 }
64
65 #if (USE_HPPA_IOREMAP)
66 static int remap_area_pages(unsigned long address, unsigned long phys_addr,
67                                  unsigned long size, unsigned long flags)
68 {
69         int error;
70         pgd_t * dir;
71         unsigned long end = address + size;
72
73         phys_addr -= address;
74         dir = pgd_offset(&init_mm, address);
75         flush_cache_all();
76         if (address >= end)
77                 BUG();
78         spin_lock(&init_mm.page_table_lock);
79         do {
80                 pmd_t *pmd;
81                 pmd = pmd_alloc(dir, address);
82                 error = -ENOMEM;
83                 if (!pmd)
84                         break;
85                 if (remap_area_pmd(pmd, address, end - address,
86                                          phys_addr + address, flags))
87                         break;
88                 error = 0;
89                 address = (address + PGDIR_SIZE) & PGDIR_MASK;
90                 dir++;
91         } while (address && (address < end));
92         spin_unlock(&init_mm.page_table_lock);
93         flush_tlb_all();
94         return error;
95 }
96 #endif /* USE_HPPA_IOREMAP */
97
98 #ifdef CONFIG_DEBUG_IOREMAP
99 static unsigned long last = 0;
100
101 void gsc_bad_addr(unsigned long addr)
102 {
103         if (time_after(jiffies, last + HZ*10)) {
104                 printk("gsc_foo() called with bad address 0x%lx\n", addr);
105                 dump_stack();
106                 last = jiffies;
107         }
108 }
109 EXPORT_SYMBOL(gsc_bad_addr);
110
111 void __raw_bad_addr(const volatile void __iomem *addr)
112 {
113         if (time_after(jiffies, last + HZ*10)) {
114                 printk("__raw_foo() called with bad address 0x%p\n", addr);
115                 dump_stack();
116                 last = jiffies;
117         }
118 }
119 EXPORT_SYMBOL(__raw_bad_addr);
120 #endif
121
122 /*
123  * Generic mapping function (not visible outside):
124  */
125
126 /*
127  * Remap an arbitrary physical address space into the kernel virtual
128  * address space. Needed when the kernel wants to access high addresses
129  * directly.
130  *
131  * NOTE! We need to allow non-page-aligned mappings too: we will obviously
132  * have to convert them into an offset in a page-aligned mapping, but the
133  * caller shouldn't need to know that small detail.
134  */
135 void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
136 {
137 #if !(USE_HPPA_IOREMAP)
138
139         unsigned long end = phys_addr + size - 1;
140         /* Support EISA addresses */
141         if ((phys_addr >= 0x00080000 && end < 0x000fffff)
142                         || (phys_addr >= 0x00500000 && end < 0x03bfffff)) {
143                 phys_addr |= 0xfc000000;
144         }
145
146 #ifdef CONFIG_DEBUG_IOREMAP
147         return (void __iomem *)(phys_addr - (0x1UL << NYBBLE_SHIFT));
148 #else
149         return (void __iomem *)phys_addr;
150 #endif
151
152 #else
153         void * addr;
154         struct vm_struct * area;
155         unsigned long offset, last_addr;
156
157         /* Don't allow wraparound or zero size */
158         last_addr = phys_addr + size - 1;
159         if (!size || last_addr < phys_addr)
160                 return NULL;
161
162         /*
163          * Don't allow anybody to remap normal RAM that we're using..
164          */
165         if (phys_addr < virt_to_phys(high_memory)) {
166                 char *t_addr, *t_end;
167                 struct page *page;
168
169                 t_addr = __va(phys_addr);
170                 t_end = t_addr + (size - 1);
171            
172                 for(page = virt_to_page(t_addr); page <= virt_to_page(t_end); page++)
173                         if(!PageReserved(page))
174                                 return NULL;
175         }
176
177         /*
178          * Mappings have to be page-aligned
179          */
180         offset = phys_addr & ~PAGE_MASK;
181         phys_addr &= PAGE_MASK;
182         size = PAGE_ALIGN(last_addr) - phys_addr;
183
184         /*
185          * Ok, go for it..
186          */
187         area = get_vm_area(size, VM_IOREMAP);
188         if (!area)
189                 return NULL;
190         addr = area->addr;
191         if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
192                 vfree(addr);
193                 return NULL;
194         }
195         return (void __iomem *) (offset + (char *)addr);
196 #endif
197 }
198
199 void iounmap(void __iomem *addr)
200 {
201 #if !(USE_HPPA_IOREMAP)
202         return;
203 #else
204         if (addr > high_memory)
205                 return vfree((void *) (PAGE_MASK & (unsigned long __force) addr));
206 #endif
207 }