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authorThomas Gleixner <tglx@linutronix.de>2008-01-30 07:34:05 -0500
committerIngo Molnar <mingo@elte.hu>2008-01-30 07:34:05 -0500
commite64c8aa0c5e5d23730b2d702297e01cd7fe53144 (patch)
treeab5c5a9e560402cfae9171b30f5f7ead3910191e
parent240d3a7c47e3fb9c2533f63e9e323a25d91d0643 (diff)
x86: unify ioremap_32 and _64
Unify the now identical ioremap_32.c and ioremap_64.c into the same ioremap.c file. No code changed. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat
-rw-r--r--arch/x86/mm/Makefile_322
-rw-r--r--arch/x86/mm/Makefile_642
-rw-r--r--arch/x86/mm/ioremap.c (renamed from arch/x86/mm/ioremap_32.c)0
-rw-r--r--arch/x86/mm/ioremap_64.c463
4 files changed, 2 insertions, 465 deletions
diff --git a/arch/x86/mm/Makefile_32 b/arch/x86/mm/Makefile_32
index 424e5a862271..af0d39bea6c5 100644
--- a/arch/x86/mm/Makefile_32
+++ b/arch/x86/mm/Makefile_32
@@ -2,7 +2,7 @@
2# Makefile for the linux i386-specific parts of the memory manager. 2# Makefile for the linux i386-specific parts of the memory manager.
3# 3#
4 4
5obj-y := init_32.o pgtable_32.o fault_32.o ioremap_32.o extable.o pageattr.o mmap.o 5obj-y := init_32.o pgtable_32.o fault_32.o ioremap.o extable.o pageattr.o mmap.o
6 6
7obj-$(CONFIG_CPA_DEBUG) += pageattr-test.o 7obj-$(CONFIG_CPA_DEBUG) += pageattr-test.o
8obj-$(CONFIG_NUMA) += discontig_32.o 8obj-$(CONFIG_NUMA) += discontig_32.o
diff --git a/arch/x86/mm/Makefile_64 b/arch/x86/mm/Makefile_64
index 043584478457..b564b5a760da 100644
--- a/arch/x86/mm/Makefile_64
+++ b/arch/x86/mm/Makefile_64
@@ -2,7 +2,7 @@
2# Makefile for the linux x86_64-specific parts of the memory manager. 2# Makefile for the linux x86_64-specific parts of the memory manager.
3# 3#
4 4
5obj-y := init_64.o fault_64.o ioremap_64.o extable.o pageattr.o mmap.o 5obj-y := init_64.o fault_64.o ioremap.o extable.o pageattr.o mmap.o
6obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o 6obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
7obj-$(CONFIG_NUMA) += numa_64.o 7obj-$(CONFIG_NUMA) += numa_64.o
8obj-$(CONFIG_K8_NUMA) += k8topology_64.o 8obj-$(CONFIG_K8_NUMA) += k8topology_64.o
diff --git a/arch/x86/mm/ioremap_32.c b/arch/x86/mm/ioremap.c
index f4a2082568c8..f4a2082568c8 100644
--- a/arch/x86/mm/ioremap_32.c
+++ b/arch/x86/mm/ioremap.c
diff --git a/arch/x86/mm/ioremap_64.c b/arch/x86/mm/ioremap_64.c
deleted file mode 100644
index f4a2082568c8..000000000000
--- a/arch/x86/mm/ioremap_64.c
+++ /dev/null
@@ -1,463 +0,0 @@
1/*
2 * Re-map IO memory to kernel address space so that we can access it.
3 * This is needed for high PCI addresses that aren't mapped in the
4 * 640k-1MB IO memory area on PC's
5 *
6 * (C) Copyright 1995 1996 Linus Torvalds
7 */
8
9#include <linux/bootmem.h>
10#include <linux/init.h>
11#include <linux/io.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/vmalloc.h>
15
16#include <asm/cacheflush.h>
17#include <asm/e820.h>
18#include <asm/fixmap.h>
19#include <asm/pgtable.h>
20#include <asm/tlbflush.h>
21
22#ifdef CONFIG_X86_64
23
24unsigned long __phys_addr(unsigned long x)
25{
26 if (x >= __START_KERNEL_map)
27 return x - __START_KERNEL_map + phys_base;
28 return x - PAGE_OFFSET;
29}
30EXPORT_SYMBOL(__phys_addr);
31
32#endif
33
34/*
35 * Fix up the linear direct mapping of the kernel to avoid cache attribute
36 * conflicts.
37 */
38static int ioremap_change_attr(unsigned long phys_addr, unsigned long size,
39 pgprot_t prot)
40{
41 unsigned long npages, vaddr, last_addr = phys_addr + size - 1;
42 int err, level;
43
44 /* No change for pages after the last mapping */
45 if (last_addr >= (max_pfn_mapped << PAGE_SHIFT))
46 return 0;
47
48 npages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
49 vaddr = (unsigned long) __va(phys_addr);
50
51 /*
52 * If there is no identity map for this address,
53 * change_page_attr_addr is unnecessary
54 */
55 if (!lookup_address(vaddr, &level))
56 return 0;
57
58 /*
59 * Must use an address here and not struct page because the
60 * phys addr can be a in hole between nodes and not have a
61 * memmap entry.
62 */
63 err = change_page_attr_addr(vaddr, npages, prot);
64
65 if (!err)
66 global_flush_tlb();
67
68 return err;
69}
70
71/*
72 * Remap an arbitrary physical address space into the kernel virtual
73 * address space. Needed when the kernel wants to access high addresses
74 * directly.
75 *
76 * NOTE! We need to allow non-page-aligned mappings too: we will obviously
77 * have to convert them into an offset in a page-aligned mapping, but the
78 * caller shouldn't need to know that small detail.
79 */
80void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
81 unsigned long flags)
82{
83 void __iomem *addr;
84 struct vm_struct *area;
85 unsigned long offset, last_addr;
86 pgprot_t pgprot;
87
88 /* Don't allow wraparound or zero size */
89 last_addr = phys_addr + size - 1;
90 if (!size || last_addr < phys_addr)
91 return NULL;
92
93 /*
94 * Don't remap the low PCI/ISA area, it's always mapped..
95 */
96 if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS)
97 return (__force void __iomem *)phys_to_virt(phys_addr);
98
99#ifdef CONFIG_X86_32
100 /*
101 * Don't allow anybody to remap normal RAM that we're using..
102 */
103 if (phys_addr <= virt_to_phys(high_memory - 1)) {
104 char *t_addr, *t_end;
105 struct page *page;
106
107 t_addr = __va(phys_addr);
108 t_end = t_addr + (size - 1);
109
110 for (page = virt_to_page(t_addr);
111 page <= virt_to_page(t_end); page++)
112 if (!PageReserved(page))
113 return NULL;
114 }
115#endif
116
117 pgprot = MAKE_GLOBAL(__PAGE_KERNEL | flags);
118
119 /*
120 * Mappings have to be page-aligned
121 */
122 offset = phys_addr & ~PAGE_MASK;
123 phys_addr &= PAGE_MASK;
124 size = PAGE_ALIGN(last_addr+1) - phys_addr;
125
126 /*
127 * Ok, go for it..
128 */
129 area = get_vm_area(size, VM_IOREMAP);
130 if (!area)
131 return NULL;
132 area->phys_addr = phys_addr;
133 addr = (void __iomem *) area->addr;
134 if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
135 phys_addr, pgprot)) {
136 remove_vm_area((void *)(PAGE_MASK & (unsigned long) addr));
137 return NULL;
138 }
139
140 if (ioremap_change_attr(phys_addr, size, pgprot) < 0) {
141 vunmap(addr);
142 return NULL;
143 }
144
145 return (void __iomem *) (offset + (char __iomem *)addr);
146}
147EXPORT_SYMBOL(__ioremap);
148
149/**
150 * ioremap_nocache - map bus memory into CPU space
151 * @offset: bus address of the memory
152 * @size: size of the resource to map
153 *
154 * ioremap_nocache performs a platform specific sequence of operations to
155 * make bus memory CPU accessible via the readb/readw/readl/writeb/
156 * writew/writel functions and the other mmio helpers. The returned
157 * address is not guaranteed to be usable directly as a virtual
158 * address.
159 *
160 * This version of ioremap ensures that the memory is marked uncachable
161 * on the CPU as well as honouring existing caching rules from things like
162 * the PCI bus. Note that there are other caches and buffers on many
163 * busses. In particular driver authors should read up on PCI writes
164 *
165 * It's useful if some control registers are in such an area and
166 * write combining or read caching is not desirable:
167 *
168 * Must be freed with iounmap.
169 */
170void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size)
171{
172 return __ioremap(phys_addr, size, _PAGE_PCD | _PAGE_PWT);
173}
174EXPORT_SYMBOL(ioremap_nocache);
175
176/**
177 * iounmap - Free a IO remapping
178 * @addr: virtual address from ioremap_*
179 *
180 * Caller must ensure there is only one unmapping for the same pointer.
181 */
182void iounmap(volatile void __iomem *addr)
183{
184 struct vm_struct *p, *o;
185
186 if ((void __force *)addr <= high_memory)
187 return;
188
189 /*
190 * __ioremap special-cases the PCI/ISA range by not instantiating a
191 * vm_area and by simply returning an address into the kernel mapping
192 * of ISA space. So handle that here.
193 */
194 if (addr >= phys_to_virt(ISA_START_ADDRESS) &&
195 addr < phys_to_virt(ISA_END_ADDRESS))
196 return;
197
198 addr = (volatile void __iomem *)
199 (PAGE_MASK & (unsigned long __force)addr);
200
201 /* Use the vm area unlocked, assuming the caller
202 ensures there isn't another iounmap for the same address
203 in parallel. Reuse of the virtual address is prevented by
204 leaving it in the global lists until we're done with it.
205 cpa takes care of the direct mappings. */
206 read_lock(&vmlist_lock);
207 for (p = vmlist; p; p = p->next) {
208 if (p->addr == addr)
209 break;
210 }
211 read_unlock(&vmlist_lock);
212
213 if (!p) {
214 printk(KERN_ERR "iounmap: bad address %p\n", addr);
215 dump_stack();
216 return;
217 }
218
219 /* Reset the direct mapping. Can block */
220 ioremap_change_attr(p->phys_addr, p->size, PAGE_KERNEL);
221
222 /* Finally remove it */
223 o = remove_vm_area((void *)addr);
224 BUG_ON(p != o || o == NULL);
225 kfree(p);
226}
227EXPORT_SYMBOL(iounmap);
228
229#ifdef CONFIG_X86_32
230
231int __initdata early_ioremap_debug;
232
233static int __init early_ioremap_debug_setup(char *str)
234{
235 early_ioremap_debug = 1;
236
237 return 0;
238}
239early_param("early_ioremap_debug", early_ioremap_debug_setup);
240
241static __initdata int after_paging_init;
242static __initdata unsigned long bm_pte[1024]
243 __attribute__((aligned(PAGE_SIZE)));
244
245static inline unsigned long * __init early_ioremap_pgd(unsigned long addr)
246{
247 return (unsigned long *)swapper_pg_dir + ((addr >> 22) & 1023);
248}
249
250static inline unsigned long * __init early_ioremap_pte(unsigned long addr)
251{
252 return bm_pte + ((addr >> PAGE_SHIFT) & 1023);
253}
254
255void __init early_ioremap_init(void)
256{
257 unsigned long *pgd;
258
259 if (early_ioremap_debug)
260 printk(KERN_DEBUG "early_ioremap_init()\n");
261
262 pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
263 *pgd = __pa(bm_pte) | _PAGE_TABLE;
264 memset(bm_pte, 0, sizeof(bm_pte));
265 /*
266 * The boot-ioremap range spans multiple pgds, for which
267 * we are not prepared:
268 */
269 if (pgd != early_ioremap_pgd(fix_to_virt(FIX_BTMAP_END))) {
270 WARN_ON(1);
271 printk(KERN_WARNING "pgd %p != %p\n",
272 pgd, early_ioremap_pgd(fix_to_virt(FIX_BTMAP_END)));
273 printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
274 fix_to_virt(FIX_BTMAP_BEGIN));
275 printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n",
276 fix_to_virt(FIX_BTMAP_END));
277
278 printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
279 printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n",
280 FIX_BTMAP_BEGIN);
281 }
282}
283
284void __init early_ioremap_clear(void)
285{
286 unsigned long *pgd;
287
288 if (early_ioremap_debug)
289 printk(KERN_DEBUG "early_ioremap_clear()\n");
290
291 pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
292 *pgd = 0;
293 __flush_tlb_all();
294}
295
296void __init early_ioremap_reset(void)
297{
298 enum fixed_addresses idx;
299 unsigned long *pte, phys, addr;
300
301 after_paging_init = 1;
302 for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) {
303 addr = fix_to_virt(idx);
304 pte = early_ioremap_pte(addr);
305 if (!*pte & _PAGE_PRESENT) {
306 phys = *pte & PAGE_MASK;
307 set_fixmap(idx, phys);
308 }
309 }
310}
311
312static void __init __early_set_fixmap(enum fixed_addresses idx,
313 unsigned long phys, pgprot_t flags)
314{
315 unsigned long *pte, addr = __fix_to_virt(idx);
316
317 if (idx >= __end_of_fixed_addresses) {
318 BUG();
319 return;
320 }
321 pte = early_ioremap_pte(addr);
322 if (pgprot_val(flags))
323 *pte = (phys & PAGE_MASK) | pgprot_val(flags);
324 else
325 *pte = 0;
326 __flush_tlb_one(addr);
327}
328
329static inline void __init early_set_fixmap(enum fixed_addresses idx,
330 unsigned long phys)
331{
332 if (after_paging_init)
333 set_fixmap(idx, phys);
334 else
335 __early_set_fixmap(idx, phys, PAGE_KERNEL);
336}
337
338static inline void __init early_clear_fixmap(enum fixed_addresses idx)
339{
340 if (after_paging_init)
341 clear_fixmap(idx);
342 else
343 __early_set_fixmap(idx, 0, __pgprot(0));
344}
345
346
347int __initdata early_ioremap_nested;
348
349static int __init check_early_ioremap_leak(void)
350{
351 if (!early_ioremap_nested)
352 return 0;
353
354 printk(KERN_WARNING
355 "Debug warning: early ioremap leak of %d areas detected.\n",
356 early_ioremap_nested);
357 printk(KERN_WARNING
358 "please boot with early_ioremap_debug and report the dmesg.\n");
359 WARN_ON(1);
360
361 return 1;
362}
363late_initcall(check_early_ioremap_leak);
364
365void __init *early_ioremap(unsigned long phys_addr, unsigned long size)
366{
367 unsigned long offset, last_addr;
368 unsigned int nrpages, nesting;
369 enum fixed_addresses idx0, idx;
370
371 WARN_ON(system_state != SYSTEM_BOOTING);
372
373 nesting = early_ioremap_nested;
374 if (early_ioremap_debug) {
375 printk(KERN_DEBUG "early_ioremap(%08lx, %08lx) [%d] => ",
376 phys_addr, size, nesting);
377 dump_stack();
378 }
379
380 /* Don't allow wraparound or zero size */
381 last_addr = phys_addr + size - 1;
382 if (!size || last_addr < phys_addr) {
383 WARN_ON(1);
384 return NULL;
385 }
386
387 if (nesting >= FIX_BTMAPS_NESTING) {
388 WARN_ON(1);
389 return NULL;
390 }
391 early_ioremap_nested++;
392 /*
393 * Mappings have to be page-aligned
394 */
395 offset = phys_addr & ~PAGE_MASK;
396 phys_addr &= PAGE_MASK;
397 size = PAGE_ALIGN(last_addr) - phys_addr;
398
399 /*
400 * Mappings have to fit in the FIX_BTMAP area.
401 */
402 nrpages = size >> PAGE_SHIFT;
403 if (nrpages > NR_FIX_BTMAPS) {
404 WARN_ON(1);
405 return NULL;
406 }
407
408 /*
409 * Ok, go for it..
410 */
411 idx0 = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting;
412 idx = idx0;
413 while (nrpages > 0) {
414 early_set_fixmap(idx, phys_addr);
415 phys_addr += PAGE_SIZE;
416 --idx;
417 --nrpages;
418 }
419 if (early_ioremap_debug)
420 printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0));
421
422 return (void *) (offset + fix_to_virt(idx0));
423}
424
425void __init early_iounmap(void *addr, unsigned long size)
426{
427 unsigned long virt_addr;
428 unsigned long offset;
429 unsigned int nrpages;
430 enum fixed_addresses idx;
431 unsigned int nesting;
432
433 nesting = --early_ioremap_nested;
434 WARN_ON(nesting < 0);
435
436 if (early_ioremap_debug) {
437 printk(KERN_DEBUG "early_iounmap(%p, %08lx) [%d]\n", addr,
438 size, nesting);
439 dump_stack();
440 }
441
442 virt_addr = (unsigned long)addr;
443 if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) {
444 WARN_ON(1);
445 return;
446 }
447 offset = virt_addr & ~PAGE_MASK;
448 nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT;
449
450 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting;
451 while (nrpages > 0) {
452 early_clear_fixmap(idx);
453 --idx;
454 --nrpages;
455 }
456}
457
458void __this_fixmap_does_not_exist(void)
459{
460 WARN_ON(1);
461}
462
463#endif /* CONFIG_X86_32 */
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