ia64/linux-2.6.18-xen.hg

view arch/m68k/mm/kmap.c @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 /*
2 * linux/arch/m68k/mm/kmap.c
3 *
4 * Copyright (C) 1997 Roman Hodek
5 *
6 * 10/01/99 cleaned up the code and changing to the same interface
7 * used by other architectures /Roman Zippel
8 */
10 #include <linux/mm.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/types.h>
14 #include <linux/slab.h>
15 #include <linux/vmalloc.h>
17 #include <asm/setup.h>
18 #include <asm/segment.h>
19 #include <asm/page.h>
20 #include <asm/pgalloc.h>
21 #include <asm/io.h>
22 #include <asm/system.h>
24 #undef DEBUG
26 #define PTRTREESIZE (256*1024)
28 /*
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.
33 */
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)
40 {
41 return get_vm_area(size, VM_IOREMAP);
42 }
45 static inline void free_io_area(void *addr)
46 {
47 vfree((void *)(PAGE_MASK & (unsigned long)addr));
48 }
50 #else
52 #define IO_SIZE (256*1024)
54 static struct vm_struct *iolist;
56 static struct vm_struct *get_io_area(unsigned long size)
57 {
58 unsigned long addr;
59 struct vm_struct **p, *tmp, *area;
61 area = (struct vm_struct *)kmalloc(sizeof(*area), GFP_KERNEL);
62 if (!area)
63 return NULL;
64 addr = KMAP_START;
65 for (p = &iolist; (tmp = *p) ; p = &tmp->next) {
66 if (size + addr < (unsigned long)tmp->addr)
67 break;
68 if (addr > KMAP_END-size)
69 return NULL;
70 addr = tmp->size + (unsigned long)tmp->addr;
71 }
72 area->addr = (void *)addr;
73 area->size = size + IO_SIZE;
74 area->next = *p;
75 *p = area;
76 return area;
77 }
79 static inline void free_io_area(void *addr)
80 {
81 struct vm_struct **p, *tmp;
83 if (!addr)
84 return;
85 addr = (void *)((unsigned long)addr & -IO_SIZE);
86 for (p = &iolist ; (tmp = *p) ; p = &tmp->next) {
87 if (tmp->addr == addr) {
88 *p = tmp->next;
89 __iounmap(tmp->addr, tmp->size);
90 kfree(tmp);
91 return;
92 }
93 }
94 }
96 #endif
98 /*
99 * Map some physical address range into the kernel address space. The
100 * code is copied and adapted from map_chunk().
101 */
102 /* Rewritten by Andreas Schwab to remove all races. */
104 void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
105 {
106 struct vm_struct *area;
107 unsigned long virtaddr, retaddr;
108 long offset;
109 pgd_t *pgd_dir;
110 pmd_t *pmd_dir;
111 pte_t *pte_dir;
113 /*
114 * Don't allow mappings that wrap..
115 */
116 if (!size || size > physaddr + size)
117 return NULL;
119 #ifdef CONFIG_AMIGA
120 if (MACH_IS_AMIGA) {
121 if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000)
122 && (cacheflag == IOMAP_NOCACHE_SER))
123 return (void __iomem *)physaddr;
124 }
125 #endif
127 #ifdef DEBUG
128 printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag);
129 #endif
130 /*
131 * Mappings have to be aligned
132 */
133 offset = physaddr & (IO_SIZE - 1);
134 physaddr &= -IO_SIZE;
135 size = (size + offset + IO_SIZE - 1) & -IO_SIZE;
137 /*
138 * Ok, go for it..
139 */
140 area = get_io_area(size);
141 if (!area)
142 return NULL;
144 virtaddr = (unsigned long)area->addr;
145 retaddr = virtaddr + offset;
146 #ifdef DEBUG
147 printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr);
148 #endif
150 /*
151 * add cache and table flags to physical address
152 */
153 if (CPU_IS_040_OR_060) {
154 physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 |
155 _PAGE_ACCESSED | _PAGE_DIRTY);
156 switch (cacheflag) {
157 case IOMAP_FULL_CACHING:
158 physaddr |= _PAGE_CACHE040;
159 break;
160 case IOMAP_NOCACHE_SER:
161 default:
162 physaddr |= _PAGE_NOCACHE_S;
163 break;
164 case IOMAP_NOCACHE_NONSER:
165 physaddr |= _PAGE_NOCACHE;
166 break;
167 case IOMAP_WRITETHROUGH:
168 physaddr |= _PAGE_CACHE040W;
169 break;
170 }
171 } else {
172 physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
173 switch (cacheflag) {
174 case IOMAP_NOCACHE_SER:
175 case IOMAP_NOCACHE_NONSER:
176 default:
177 physaddr |= _PAGE_NOCACHE030;
178 break;
179 case IOMAP_FULL_CACHING:
180 case IOMAP_WRITETHROUGH:
181 break;
182 }
183 }
185 while ((long)size > 0) {
186 #ifdef DEBUG
187 if (!(virtaddr & (PTRTREESIZE-1)))
188 printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
189 #endif
190 pgd_dir = pgd_offset_k(virtaddr);
191 pmd_dir = pmd_alloc(&init_mm, pgd_dir, virtaddr);
192 if (!pmd_dir) {
193 printk("ioremap: no mem for pmd_dir\n");
194 return NULL;
195 }
197 if (CPU_IS_020_OR_030) {
198 pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
199 physaddr += PTRTREESIZE;
200 virtaddr += PTRTREESIZE;
201 size -= PTRTREESIZE;
202 } else {
203 pte_dir = pte_alloc_kernel(pmd_dir, virtaddr);
204 if (!pte_dir) {
205 printk("ioremap: no mem for pte_dir\n");
206 return NULL;
207 }
209 pte_val(*pte_dir) = physaddr;
210 virtaddr += PAGE_SIZE;
211 physaddr += PAGE_SIZE;
212 size -= PAGE_SIZE;
213 }
214 }
215 #ifdef DEBUG
216 printk("\n");
217 #endif
218 flush_tlb_all();
220 return (void __iomem *)retaddr;
221 }
223 /*
224 * Unmap a ioremap()ed region again
225 */
226 void iounmap(void __iomem *addr)
227 {
228 #ifdef CONFIG_AMIGA
229 if ((!MACH_IS_AMIGA) ||
230 (((unsigned long)addr < 0x40000000) ||
231 ((unsigned long)addr > 0x60000000)))
232 free_io_area((__force void *)addr);
233 #else
234 free_io_area((__force void *)addr);
235 #endif
236 }
238 /*
239 * __iounmap unmaps nearly everything, so be careful
240 * it doesn't free currently pointer/page tables anymore but it
241 * wans't used anyway and might be added later.
242 */
243 void __iounmap(void *addr, unsigned long size)
244 {
245 unsigned long virtaddr = (unsigned long)addr;
246 pgd_t *pgd_dir;
247 pmd_t *pmd_dir;
248 pte_t *pte_dir;
250 while ((long)size > 0) {
251 pgd_dir = pgd_offset_k(virtaddr);
252 if (pgd_bad(*pgd_dir)) {
253 printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
254 pgd_clear(pgd_dir);
255 return;
256 }
257 pmd_dir = pmd_offset(pgd_dir, virtaddr);
259 if (CPU_IS_020_OR_030) {
260 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
261 int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK;
263 if (pmd_type == _PAGE_PRESENT) {
264 pmd_dir->pmd[pmd_off] = 0;
265 virtaddr += PTRTREESIZE;
266 size -= PTRTREESIZE;
267 continue;
268 } else if (pmd_type == 0)
269 continue;
270 }
272 if (pmd_bad(*pmd_dir)) {
273 printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
274 pmd_clear(pmd_dir);
275 return;
276 }
277 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
279 pte_val(*pte_dir) = 0;
280 virtaddr += PAGE_SIZE;
281 size -= PAGE_SIZE;
282 }
284 flush_tlb_all();
285 }
287 /*
288 * Set new cache mode for some kernel address space.
289 * The caller must push data for that range itself, if such data may already
290 * be in the cache.
291 */
292 void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
293 {
294 unsigned long virtaddr = (unsigned long)addr;
295 pgd_t *pgd_dir;
296 pmd_t *pmd_dir;
297 pte_t *pte_dir;
299 if (CPU_IS_040_OR_060) {
300 switch (cmode) {
301 case IOMAP_FULL_CACHING:
302 cmode = _PAGE_CACHE040;
303 break;
304 case IOMAP_NOCACHE_SER:
305 default:
306 cmode = _PAGE_NOCACHE_S;
307 break;
308 case IOMAP_NOCACHE_NONSER:
309 cmode = _PAGE_NOCACHE;
310 break;
311 case IOMAP_WRITETHROUGH:
312 cmode = _PAGE_CACHE040W;
313 break;
314 }
315 } else {
316 switch (cmode) {
317 case IOMAP_NOCACHE_SER:
318 case IOMAP_NOCACHE_NONSER:
319 default:
320 cmode = _PAGE_NOCACHE030;
321 break;
322 case IOMAP_FULL_CACHING:
323 case IOMAP_WRITETHROUGH:
324 cmode = 0;
325 }
326 }
328 while ((long)size > 0) {
329 pgd_dir = pgd_offset_k(virtaddr);
330 if (pgd_bad(*pgd_dir)) {
331 printk("iocachemode: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
332 pgd_clear(pgd_dir);
333 return;
334 }
335 pmd_dir = pmd_offset(pgd_dir, virtaddr);
337 if (CPU_IS_020_OR_030) {
338 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
340 if ((pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK) == _PAGE_PRESENT) {
341 pmd_dir->pmd[pmd_off] = (pmd_dir->pmd[pmd_off] &
342 _CACHEMASK040) | cmode;
343 virtaddr += PTRTREESIZE;
344 size -= PTRTREESIZE;
345 continue;
346 }
347 }
349 if (pmd_bad(*pmd_dir)) {
350 printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
351 pmd_clear(pmd_dir);
352 return;
353 }
354 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
356 pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode;
357 virtaddr += PAGE_SIZE;
358 size -= PAGE_SIZE;
359 }
361 flush_tlb_all();
362 }