2 * linux/arch/m68k/mm/kmap.c
4 * Copyright (C) 1997 Roman Hodek
6 * 10/01/99 cleaned up the code and changing to the same interface
7 * used by other architectures /Roman Zippel
10 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/string.h>
14 #include <linux/types.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
18 #include <asm/setup.h>
19 #include <asm/segment.h>
21 #include <asm/pgalloc.h>
26 #define PTRTREESIZE (256*1024)
29 * For 040/060 we can use the virtual memory area like other architectures,
30 * but for 020/030 we want to use early termination page descriptor and we
31 * can't mix this with normal page descriptors, so we have to copy that code
32 * (mm/vmalloc.c) and return appriorate aligned addresses.
35 #ifdef CPU_M68040_OR_M68060_ONLY
37 #define IO_SIZE PAGE_SIZE
39 static inline struct vm_struct *get_io_area(unsigned long size)
41 return get_vm_area(size, VM_IOREMAP);
45 static inline void free_io_area(void *addr)
47 vfree((void *)(PAGE_MASK & (unsigned long)addr));
52 #define IO_SIZE (256*1024)
54 static struct vm_struct *iolist;
56 static struct vm_struct *get_io_area(unsigned long size)
59 struct vm_struct **p, *tmp, *area;
61 area = kmalloc(sizeof(*area), GFP_KERNEL);
65 for (p = &iolist; (tmp = *p) ; p = &tmp->next) {
66 if (size + addr < (unsigned long)tmp->addr)
68 if (addr > KMAP_END-size) {
72 addr = tmp->size + (unsigned long)tmp->addr;
74 area->addr = (void *)addr;
75 area->size = size + IO_SIZE;
81 static inline void free_io_area(void *addr)
83 struct vm_struct **p, *tmp;
87 addr = (void *)((unsigned long)addr & -IO_SIZE);
88 for (p = &iolist ; (tmp = *p) ; p = &tmp->next) {
89 if (tmp->addr == addr) {
91 __iounmap(tmp->addr, tmp->size);
101 * Map some physical address range into the kernel address space.
103 /* Rewritten by Andreas Schwab to remove all races. */
105 void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
107 struct vm_struct *area;
108 unsigned long virtaddr, retaddr;
115 * Don't allow mappings that wrap..
117 if (!size || physaddr > (unsigned long)(-size))
122 if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000)
123 && (cacheflag == IOMAP_NOCACHE_SER))
124 return (void __iomem *)physaddr;
129 printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag);
132 * Mappings have to be aligned
134 offset = physaddr & (IO_SIZE - 1);
135 physaddr &= -IO_SIZE;
136 size = (size + offset + IO_SIZE - 1) & -IO_SIZE;
141 area = get_io_area(size);
145 virtaddr = (unsigned long)area->addr;
146 retaddr = virtaddr + offset;
148 printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr);
152 * add cache and table flags to physical address
154 if (CPU_IS_040_OR_060) {
155 physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 |
156 _PAGE_ACCESSED | _PAGE_DIRTY);
158 case IOMAP_FULL_CACHING:
159 physaddr |= _PAGE_CACHE040;
161 case IOMAP_NOCACHE_SER:
163 physaddr |= _PAGE_NOCACHE_S;
165 case IOMAP_NOCACHE_NONSER:
166 physaddr |= _PAGE_NOCACHE;
168 case IOMAP_WRITETHROUGH:
169 physaddr |= _PAGE_CACHE040W;
173 physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED |
174 _PAGE_DIRTY | _PAGE_READWRITE);
176 case IOMAP_NOCACHE_SER:
177 case IOMAP_NOCACHE_NONSER:
179 physaddr |= _PAGE_NOCACHE030;
181 case IOMAP_FULL_CACHING:
182 case IOMAP_WRITETHROUGH:
187 while ((long)size > 0) {
189 if (!(virtaddr & (PTRTREESIZE-1)))
190 printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
192 pgd_dir = pgd_offset_k(virtaddr);
193 pmd_dir = pmd_alloc(&init_mm, pgd_dir, virtaddr);
195 printk("ioremap: no mem for pmd_dir\n");
199 if (CPU_IS_020_OR_030) {
200 pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
201 physaddr += PTRTREESIZE;
202 virtaddr += PTRTREESIZE;
205 pte_dir = pte_alloc_kernel(pmd_dir, virtaddr);
207 printk("ioremap: no mem for pte_dir\n");
211 pte_val(*pte_dir) = physaddr;
212 virtaddr += PAGE_SIZE;
213 physaddr += PAGE_SIZE;
222 return (void __iomem *)retaddr;
224 EXPORT_SYMBOL(__ioremap);
227 * Unmap a ioremap()ed region again
229 void iounmap(void __iomem *addr)
232 if ((!MACH_IS_AMIGA) ||
233 (((unsigned long)addr < 0x40000000) ||
234 ((unsigned long)addr > 0x60000000)))
235 free_io_area((__force void *)addr);
237 free_io_area((__force void *)addr);
240 EXPORT_SYMBOL(iounmap);
243 * __iounmap unmaps nearly everything, so be careful
244 * it doesn't free currently pointer/page tables anymore but it
245 * wans't used anyway and might be added later.
247 void __iounmap(void *addr, unsigned long size)
249 unsigned long virtaddr = (unsigned long)addr;
254 while ((long)size > 0) {
255 pgd_dir = pgd_offset_k(virtaddr);
256 if (pgd_bad(*pgd_dir)) {
257 printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
261 pmd_dir = pmd_offset(pgd_dir, virtaddr);
263 if (CPU_IS_020_OR_030) {
264 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
265 int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK;
267 if (pmd_type == _PAGE_PRESENT) {
268 pmd_dir->pmd[pmd_off] = 0;
269 virtaddr += PTRTREESIZE;
272 } else if (pmd_type == 0)
276 if (pmd_bad(*pmd_dir)) {
277 printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
281 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
283 pte_val(*pte_dir) = 0;
284 virtaddr += PAGE_SIZE;
292 * Set new cache mode for some kernel address space.
293 * The caller must push data for that range itself, if such data may already
296 void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
298 unsigned long virtaddr = (unsigned long)addr;
303 if (CPU_IS_040_OR_060) {
305 case IOMAP_FULL_CACHING:
306 cmode = _PAGE_CACHE040;
308 case IOMAP_NOCACHE_SER:
310 cmode = _PAGE_NOCACHE_S;
312 case IOMAP_NOCACHE_NONSER:
313 cmode = _PAGE_NOCACHE;
315 case IOMAP_WRITETHROUGH:
316 cmode = _PAGE_CACHE040W;
321 case IOMAP_NOCACHE_SER:
322 case IOMAP_NOCACHE_NONSER:
324 cmode = _PAGE_NOCACHE030;
326 case IOMAP_FULL_CACHING:
327 case IOMAP_WRITETHROUGH:
332 while ((long)size > 0) {
333 pgd_dir = pgd_offset_k(virtaddr);
334 if (pgd_bad(*pgd_dir)) {
335 printk("iocachemode: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
339 pmd_dir = pmd_offset(pgd_dir, virtaddr);
341 if (CPU_IS_020_OR_030) {
342 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
344 if ((pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK) == _PAGE_PRESENT) {
345 pmd_dir->pmd[pmd_off] = (pmd_dir->pmd[pmd_off] &
346 _CACHEMASK040) | cmode;
347 virtaddr += PTRTREESIZE;
353 if (pmd_bad(*pmd_dir)) {
354 printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
358 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
360 pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode;
361 virtaddr += PAGE_SIZE;
367 EXPORT_SYMBOL(kernel_set_cachemode);