ia64/linux-2.6.18-xen.hg

view include/asm-m32r/pgtable.h @ 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 #ifndef _ASM_M32R_PGTABLE_H
2 #define _ASM_M32R_PGTABLE_H
4 #include <asm-generic/4level-fixup.h>
6 #ifdef __KERNEL__
7 /*
8 * The Linux memory management assumes a three-level page table setup. On
9 * the M32R, we use that, but "fold" the mid level into the top-level page
10 * table, so that we physically have the same two-level page table as the
11 * M32R mmu expects.
12 *
13 * This file contains the functions and defines necessary to modify and use
14 * the M32R page table tree.
15 */
17 /* CAUTION!: If you change macro definitions in this file, you might have to
18 * change arch/m32r/mmu.S manually.
19 */
21 #ifndef __ASSEMBLY__
23 #include <linux/threads.h>
24 #include <asm/processor.h>
25 #include <asm/addrspace.h>
26 #include <asm/bitops.h>
27 #include <asm/page.h>
29 struct mm_struct;
30 struct vm_area_struct;
32 extern pgd_t swapper_pg_dir[1024];
33 extern void paging_init(void);
35 /*
36 * ZERO_PAGE is a global shared page that is always zero: used
37 * for zero-mapped memory areas etc..
38 */
39 extern unsigned long empty_zero_page[1024];
40 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
42 #endif /* !__ASSEMBLY__ */
44 #ifndef __ASSEMBLY__
45 #include <asm/pgtable-2level.h>
46 #endif
48 #define pgtable_cache_init() do { } while (0)
50 #define PMD_SIZE (1UL << PMD_SHIFT)
51 #define PMD_MASK (~(PMD_SIZE - 1))
52 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
53 #define PGDIR_MASK (~(PGDIR_SIZE - 1))
55 #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
56 #define FIRST_USER_ADDRESS 0
58 #ifndef __ASSEMBLY__
59 /* Just any arbitrary offset to the start of the vmalloc VM area: the
60 * current 8MB value just means that there will be a 8MB "hole" after the
61 * physical memory until the kernel virtual memory starts. That means that
62 * any out-of-bounds memory accesses will hopefully be caught.
63 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
64 * area for the same reason. ;)
65 */
66 #define VMALLOC_START KSEG2
67 #define VMALLOC_END KSEG3
69 /*
70 * M32R TLB format
71 *
72 * [0] [1:19] [20:23] [24:31]
73 * +-----------------------+----+-------------+
74 * | VPN |0000| ASID |
75 * +-----------------------+----+-------------+
76 * +-+---------------------+----+-+---+-+-+-+-+
77 * |0 PPN |0000|N|AC |L|G|V| |
78 * +-+---------------------+----+-+---+-+-+-+-+
79 * RWX
80 */
82 #define _PAGE_BIT_DIRTY 0 /* software: page changed */
83 #define _PAGE_BIT_FILE 0 /* when !present: nonlinear file
84 mapping */
85 #define _PAGE_BIT_PRESENT 1 /* Valid: page is valid */
86 #define _PAGE_BIT_GLOBAL 2 /* Global */
87 #define _PAGE_BIT_LARGE 3 /* Large */
88 #define _PAGE_BIT_EXEC 4 /* Execute */
89 #define _PAGE_BIT_WRITE 5 /* Write */
90 #define _PAGE_BIT_READ 6 /* Read */
91 #define _PAGE_BIT_NONCACHABLE 7 /* Non cachable */
92 #define _PAGE_BIT_ACCESSED 8 /* software: page referenced */
93 #define _PAGE_BIT_PROTNONE 9 /* software: if not present */
95 #define _PAGE_DIRTY (1UL << _PAGE_BIT_DIRTY)
96 #define _PAGE_FILE (1UL << _PAGE_BIT_FILE)
97 #define _PAGE_PRESENT (1UL << _PAGE_BIT_PRESENT)
98 #define _PAGE_GLOBAL (1UL << _PAGE_BIT_GLOBAL)
99 #define _PAGE_LARGE (1UL << _PAGE_BIT_LARGE)
100 #define _PAGE_EXEC (1UL << _PAGE_BIT_EXEC)
101 #define _PAGE_WRITE (1UL << _PAGE_BIT_WRITE)
102 #define _PAGE_READ (1UL << _PAGE_BIT_READ)
103 #define _PAGE_NONCACHABLE (1UL << _PAGE_BIT_NONCACHABLE)
104 #define _PAGE_ACCESSED (1UL << _PAGE_BIT_ACCESSED)
105 #define _PAGE_PROTNONE (1UL << _PAGE_BIT_PROTNONE)
107 #define _PAGE_TABLE \
108 ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
109 | _PAGE_DIRTY )
110 #define _KERNPG_TABLE \
111 ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
112 | _PAGE_DIRTY )
113 #define _PAGE_CHG_MASK \
114 ( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY )
116 #ifdef CONFIG_MMU
117 #define PAGE_NONE \
118 __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
119 #define PAGE_SHARED \
120 __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)
121 #define PAGE_SHARED_EXEC \
122 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \
123 | _PAGE_ACCESSED)
124 #define PAGE_COPY \
125 __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
126 #define PAGE_COPY_EXEC \
127 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
128 #define PAGE_READONLY \
129 __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
130 #define PAGE_READONLY_EXEC \
131 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
133 #define __PAGE_KERNEL \
134 ( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \
135 | _PAGE_ACCESSED )
136 #define __PAGE_KERNEL_RO ( __PAGE_KERNEL & ~_PAGE_WRITE )
137 #define __PAGE_KERNEL_NOCACHE ( __PAGE_KERNEL | _PAGE_NONCACHABLE)
139 #define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
141 #define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
142 #define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
143 #define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
145 #else
146 #define PAGE_NONE __pgprot(0)
147 #define PAGE_SHARED __pgprot(0)
148 #define PAGE_SHARED_EXEC __pgprot(0)
149 #define PAGE_COPY __pgprot(0)
150 #define PAGE_COPY_EXEC __pgprot(0)
151 #define PAGE_READONLY __pgprot(0)
152 #define PAGE_READONLY_EXEC __pgprot(0)
154 #define PAGE_KERNEL __pgprot(0)
155 #define PAGE_KERNEL_RO __pgprot(0)
156 #define PAGE_KERNEL_NOCACHE __pgprot(0)
157 #endif /* CONFIG_MMU */
159 /* xwr */
160 #define __P000 PAGE_NONE
161 #define __P001 PAGE_READONLY
162 #define __P010 PAGE_COPY
163 #define __P011 PAGE_COPY
164 #define __P100 PAGE_READONLY_EXEC
165 #define __P101 PAGE_READONLY_EXEC
166 #define __P110 PAGE_COPY_EXEC
167 #define __P111 PAGE_COPY_EXEC
169 #define __S000 PAGE_NONE
170 #define __S001 PAGE_READONLY
171 #define __S010 PAGE_SHARED
172 #define __S011 PAGE_SHARED
173 #define __S100 PAGE_READONLY_EXEC
174 #define __S101 PAGE_READONLY_EXEC
175 #define __S110 PAGE_SHARED_EXEC
176 #define __S111 PAGE_SHARED_EXEC
178 /* page table for 0-4MB for everybody */
180 #define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
181 #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
183 #define pmd_none(x) (!pmd_val(x))
184 #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
185 #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
186 #define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)
188 #define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT))
190 /*
191 * The following only work if pte_present() is true.
192 * Undefined behaviour if not..
193 */
194 static inline int pte_read(pte_t pte)
195 {
196 return pte_val(pte) & _PAGE_READ;
197 }
199 static inline int pte_exec(pte_t pte)
200 {
201 return pte_val(pte) & _PAGE_EXEC;
202 }
204 static inline int pte_dirty(pte_t pte)
205 {
206 return pte_val(pte) & _PAGE_DIRTY;
207 }
209 static inline int pte_young(pte_t pte)
210 {
211 return pte_val(pte) & _PAGE_ACCESSED;
212 }
214 static inline int pte_write(pte_t pte)
215 {
216 return pte_val(pte) & _PAGE_WRITE;
217 }
219 /*
220 * The following only works if pte_present() is not true.
221 */
222 static inline int pte_file(pte_t pte)
223 {
224 return pte_val(pte) & _PAGE_FILE;
225 }
227 static inline pte_t pte_rdprotect(pte_t pte)
228 {
229 pte_val(pte) &= ~_PAGE_READ;
230 return pte;
231 }
233 static inline pte_t pte_exprotect(pte_t pte)
234 {
235 pte_val(pte) &= ~_PAGE_EXEC;
236 return pte;
237 }
239 static inline pte_t pte_mkclean(pte_t pte)
240 {
241 pte_val(pte) &= ~_PAGE_DIRTY;
242 return pte;
243 }
245 static inline pte_t pte_mkold(pte_t pte)
246 {
247 pte_val(pte) &= ~_PAGE_ACCESSED;
248 return pte;
249 }
251 static inline pte_t pte_wrprotect(pte_t pte)
252 {
253 pte_val(pte) &= ~_PAGE_WRITE;
254 return pte;
255 }
257 static inline pte_t pte_mkread(pte_t pte)
258 {
259 pte_val(pte) |= _PAGE_READ;
260 return pte;
261 }
263 static inline pte_t pte_mkexec(pte_t pte)
264 {
265 pte_val(pte) |= _PAGE_EXEC;
266 return pte;
267 }
269 static inline pte_t pte_mkdirty(pte_t pte)
270 {
271 pte_val(pte) |= _PAGE_DIRTY;
272 return pte;
273 }
275 static inline pte_t pte_mkyoung(pte_t pte)
276 {
277 pte_val(pte) |= _PAGE_ACCESSED;
278 return pte;
279 }
281 static inline pte_t pte_mkwrite(pte_t pte)
282 {
283 pte_val(pte) |= _PAGE_WRITE;
284 return pte;
285 }
287 static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
288 {
289 return test_and_clear_bit(_PAGE_BIT_DIRTY, ptep);
290 }
292 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
293 {
294 return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
295 }
297 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
298 {
299 clear_bit(_PAGE_BIT_WRITE, ptep);
300 }
302 /*
303 * Macro and implementation to make a page protection as uncachable.
304 */
305 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
306 {
307 unsigned long prot = pgprot_val(_prot);
309 prot |= _PAGE_NONCACHABLE;
310 return __pgprot(prot);
311 }
313 #define pgprot_writecombine(prot) pgprot_noncached(prot)
315 /*
316 * Conversion functions: convert a page and protection to a page entry,
317 * and a page entry and page directory to the page they refer to.
318 */
319 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), pgprot)
321 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
322 {
323 set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \
324 | pgprot_val(newprot)));
326 return pte;
327 }
329 /*
330 * Conversion functions: convert a page and protection to a page entry,
331 * and a page entry and page directory to the page they refer to.
332 */
334 static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
335 {
336 pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
337 }
339 #define pmd_page_kernel(pmd) \
340 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
342 #ifndef CONFIG_DISCONTIGMEM
343 #define pmd_page(pmd) (mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
344 #endif /* !CONFIG_DISCONTIGMEM */
346 /* to find an entry in a page-table-directory. */
347 #define pgd_index(address) \
348 (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
350 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
352 /* to find an entry in a kernel page-table-directory */
353 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
355 #define pmd_index(address) \
356 (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
358 #define pte_index(address) \
359 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
360 #define pte_offset_kernel(dir, address) \
361 ((pte_t *)pmd_page_kernel(*(dir)) + pte_index(address))
362 #define pte_offset_map(dir, address) \
363 ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
364 #define pte_offset_map_nested(dir, address) pte_offset_map(dir, address)
365 #define pte_unmap(pte) do { } while (0)
366 #define pte_unmap_nested(pte) do { } while (0)
368 /* Encode and de-code a swap entry */
369 #define __swp_type(x) (((x).val >> 2) & 0x3f)
370 #define __swp_offset(x) ((x).val >> 10)
371 #define __swp_entry(type, offset) \
372 ((swp_entry_t) { ((type) << 2) | ((offset) << 10) })
373 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
374 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
376 #endif /* !__ASSEMBLY__ */
378 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
379 #define kern_addr_valid(addr) (1)
381 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
382 remap_pfn_range(vma, vaddr, pfn, size, prot)
384 #define MK_IOSPACE_PFN(space, pfn) (pfn)
385 #define GET_IOSPACE(pfn) 0
386 #define GET_PFN(pfn) (pfn)
388 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
389 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
390 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
391 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
392 #define __HAVE_ARCH_PTE_SAME
393 #include <asm-generic/pgtable.h>
395 #endif /* __KERNEL__ */
397 #endif /* _ASM_M32R_PGTABLE_H */