ia64/xen-unstable

view linux-2.6-xen-sparse/include/asm-ia64/page.h @ 9976:fc75a2c9835e

[IA64] linux: arch_free_page()

add defeinitions of arch_free_page()
work around for PG_foreign. xen/ia64 uses PG_arch1.
This work around sould be removed once PG_foreign is taken.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author awilliam@xenbuild.aw
date Tue May 09 11:42:26 2006 -0600 (2006-05-09)
parents 32db03c64a12
children 2286ce3035fc
line source
1 #ifndef _ASM_IA64_PAGE_H
2 #define _ASM_IA64_PAGE_H
3 /*
4 * Pagetable related stuff.
5 *
6 * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
7 * David Mosberger-Tang <davidm@hpl.hp.com>
8 */
10 #include <linux/config.h>
12 #include <asm/intrinsics.h>
13 #include <asm/types.h>
15 /*
16 * The top three bits of an IA64 address are its Region Number.
17 * Different regions are assigned to different purposes.
18 */
19 #define RGN_SHIFT (61)
20 #define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT)
21 #define RGN_BITS (RGN_BASE(-1))
23 #define RGN_KERNEL 7 /* Identity mapped region */
24 #define RGN_UNCACHED 6 /* Identity mapped I/O region */
25 #define RGN_GATE 5 /* Gate page, Kernel text, etc */
26 #define RGN_HPAGE 4 /* For Huge TLB pages */
28 /*
29 * PAGE_SHIFT determines the actual kernel page size.
30 */
31 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
32 # define PAGE_SHIFT 12
33 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
34 # define PAGE_SHIFT 13
35 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
36 # define PAGE_SHIFT 14
37 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
38 # define PAGE_SHIFT 16
39 #else
40 # error Unsupported page size!
41 #endif
43 #define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
44 #define PAGE_MASK (~(PAGE_SIZE - 1))
45 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
47 #define PERCPU_PAGE_SHIFT 16 /* log2() of max. size of per-CPU area */
48 #define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
51 #ifdef CONFIG_HUGETLB_PAGE
52 # define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE)
53 # define HPAGE_SHIFT hpage_shift
54 # define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */
55 # define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT)
56 # define HPAGE_MASK (~(HPAGE_SIZE - 1))
58 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
59 # define ARCH_HAS_HUGEPAGE_ONLY_RANGE
60 #endif /* CONFIG_HUGETLB_PAGE */
62 #ifdef __ASSEMBLY__
63 # define __pa(x) ((x) - PAGE_OFFSET)
64 # define __va(x) ((x) + PAGE_OFFSET)
65 #else /* !__ASSEMBLY */
66 # ifdef __KERNEL__
67 # define STRICT_MM_TYPECHECKS
69 extern void clear_page (void *page);
70 extern void copy_page (void *to, void *from);
72 /*
73 * clear_user_page() and copy_user_page() can't be inline functions because
74 * flush_dcache_page() can't be defined until later...
75 */
76 #define clear_user_page(addr, vaddr, page) \
77 do { \
78 clear_page(addr); \
79 flush_dcache_page(page); \
80 } while (0)
82 #define copy_user_page(to, from, vaddr, page) \
83 do { \
84 copy_page((to), (from)); \
85 flush_dcache_page(page); \
86 } while (0)
89 #define alloc_zeroed_user_highpage(vma, vaddr) \
90 ({ \
91 struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr); \
92 if (page) \
93 flush_dcache_page(page); \
94 page; \
95 })
97 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
99 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
101 #ifdef CONFIG_VIRTUAL_MEM_MAP
102 extern int ia64_pfn_valid (unsigned long pfn);
103 #elif defined(CONFIG_FLATMEM)
104 # define ia64_pfn_valid(pfn) 1
105 #endif
107 #ifdef CONFIG_FLATMEM
108 # define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
109 # define page_to_pfn(page) ((unsigned long) (page - mem_map))
110 # define pfn_to_page(pfn) (mem_map + (pfn))
111 #elif defined(CONFIG_DISCONTIGMEM)
112 extern struct page *vmem_map;
113 extern unsigned long min_low_pfn;
114 extern unsigned long max_low_pfn;
115 # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
116 # define page_to_pfn(page) ((unsigned long) (page - vmem_map))
117 # define pfn_to_page(pfn) (vmem_map + (pfn))
118 #endif
120 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
121 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
123 typedef union ia64_va {
124 struct {
125 unsigned long off : 61; /* intra-region offset */
126 unsigned long reg : 3; /* region number */
127 } f;
128 unsigned long l;
129 void *p;
130 } ia64_va;
132 /*
133 * Note: These macros depend on the fact that PAGE_OFFSET has all
134 * region bits set to 1 and all other bits set to zero. They are
135 * expressed in this way to ensure they result in a single "dep"
136 * instruction.
137 */
138 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
139 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
141 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
142 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
144 #ifdef CONFIG_HUGETLB_PAGE
145 # define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \
146 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
147 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
148 # define is_hugepage_only_range(mm, addr, len) \
149 (REGION_NUMBER(addr) == RGN_HPAGE && \
150 REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
151 extern unsigned int hpage_shift;
152 #endif
154 static __inline__ int
155 get_order (unsigned long size)
156 {
157 long double d = size - 1;
158 long order;
160 order = ia64_getf_exp(d);
161 order = order - PAGE_SHIFT - 0xffff + 1;
162 if (order < 0)
163 order = 0;
164 return order;
165 }
167 # endif /* __KERNEL__ */
168 #endif /* !__ASSEMBLY__ */
170 #ifdef STRICT_MM_TYPECHECKS
171 /*
172 * These are used to make use of C type-checking..
173 */
174 typedef struct { unsigned long pte; } pte_t;
175 typedef struct { unsigned long pmd; } pmd_t;
176 #ifdef CONFIG_PGTABLE_4
177 typedef struct { unsigned long pud; } pud_t;
178 #endif
179 typedef struct { unsigned long pgd; } pgd_t;
180 typedef struct { unsigned long pgprot; } pgprot_t;
182 # define pte_val(x) ((x).pte)
183 # define pmd_val(x) ((x).pmd)
184 #ifdef CONFIG_PGTABLE_4
185 # define pud_val(x) ((x).pud)
186 #endif
187 # define pgd_val(x) ((x).pgd)
188 # define pgprot_val(x) ((x).pgprot)
190 # define __pte(x) ((pte_t) { (x) } )
191 # define __pgprot(x) ((pgprot_t) { (x) } )
193 #else /* !STRICT_MM_TYPECHECKS */
194 /*
195 * .. while these make it easier on the compiler
196 */
197 # ifndef __ASSEMBLY__
198 typedef unsigned long pte_t;
199 typedef unsigned long pmd_t;
200 typedef unsigned long pgd_t;
201 typedef unsigned long pgprot_t;
202 # endif
204 # define pte_val(x) (x)
205 # define pmd_val(x) (x)
206 # define pgd_val(x) (x)
207 # define pgprot_val(x) (x)
209 # define __pte(x) (x)
210 # define __pgd(x) (x)
211 # define __pgprot(x) (x)
212 #endif /* !STRICT_MM_TYPECHECKS */
214 #define PAGE_OFFSET RGN_BASE(RGN_KERNEL)
216 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
217 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
218 (((current->personality & READ_IMPLIES_EXEC) != 0) \
219 ? VM_EXEC : 0))
221 #ifndef __ASSEMBLY__
222 #ifdef CONFIG_XEN
224 #define INVALID_P2M_ENTRY (~0UL)
226 #ifndef CONFIG_XEN_IA64_DOM0_VP
228 #define virt_to_machine(v) __pa(v)
229 #define machine_to_virt(m) __va(m)
230 #define virt_to_mfn(v) ((__pa(v)) >> PAGE_SHIFT)
231 #define mfn_to_virt(m) (__va((m) << PAGE_SHIFT))
233 #else
235 #include <linux/kernel.h>
236 #include <asm/hypervisor.h>
238 // XXX hack!
239 // Linux/IA64 uses PG_arch_1.
240 // This hack will be removed once PG_foreign bit is taken.
241 //#include <xen/foreign_page.h>
242 #ifdef __ASM_XEN_FOREIGN_PAGE_H__
243 # error "don't include include/xen/foreign_page.h!"
244 #endif
246 extern struct address_space xen_ia64_foreign_dummy_mapping;
247 #define PageForeign(page) \
248 ((page)->mapping == &xen_ia64_foreign_dummy_mapping)
250 #define SetPageForeign(page, dtor) do { \
251 set_page_private((page), (unsigned long)(dtor)); \
252 (page)->mapping = &xen_ia64_foreign_dummy_mapping; \
253 smp_rmb(); \
254 } while (0)
256 #define ClearPageForeign(page) do { \
257 (page)->mapping = NULL; \
258 smp_rmb(); \
259 set_page_private((page), 0); \
260 } while (0)
262 #define PageForeignDestructor(page) \
263 ( (void (*) (struct page *)) page_private(page) )
265 #define arch_free_page(_page,_order) \
266 ({ int foreign = PageForeign(_page); \
267 if (foreign) \
268 (PageForeignDestructor(_page))(_page); \
269 foreign; \
270 })
271 #define HAVE_ARCH_FREE_PAGE
273 //XXX xen page size != page size
275 static inline unsigned long
276 pfn_to_mfn_for_dma(unsigned long pfn)
277 {
278 unsigned long mfn;
279 mfn = HYPERVISOR_phystomach(pfn);
280 BUG_ON(mfn == 0); // XXX
281 BUG_ON(mfn == INVALID_P2M_ENTRY); // XXX
282 BUG_ON(mfn == INVALID_MFN);
283 return mfn;
284 }
286 static inline unsigned long
287 phys_to_machine_for_dma(unsigned long phys)
288 {
289 unsigned long machine =
290 pfn_to_mfn_for_dma(phys >> PAGE_SHIFT) << PAGE_SHIFT;
291 machine |= (phys & ~PAGE_MASK);
292 return machine;
293 }
295 static inline unsigned long
296 mfn_to_pfn_for_dma(unsigned long mfn)
297 {
298 unsigned long pfn;
299 pfn = HYPERVISOR_machtophys(mfn);
300 BUG_ON(pfn == 0);
301 //BUG_ON(pfn == INVALID_M2P_ENTRY);
302 return pfn;
303 }
305 static inline unsigned long
306 machine_to_phys_for_dma(unsigned long machine)
307 {
308 unsigned long phys =
309 mfn_to_pfn_for_dma(machine >> PAGE_SHIFT) << PAGE_SHIFT;
310 phys |= (machine & ~PAGE_MASK);
311 return phys;
312 }
314 #define set_phys_to_machine(pfn, mfn) do { } while (0)
315 #define xen_machphys_update(mfn, pfn) do { } while (0)
317 //XXX to compile set_phys_to_machine(vaddr, FOREIGN_FRAME(m))
318 #define FOREIGN_FRAME(m) (INVALID_P2M_ENTRY)
320 #define mfn_to_pfn(mfn) (mfn)
321 #define mfn_to_virt(mfn) (__va((mfn) << PAGE_SHIFT))
322 #define pfn_to_mfn(pfn) (pfn)
323 #define virt_to_mfn(virt) (__pa(virt) >> PAGE_SHIFT)
324 #define virt_to_machine(virt) __pa(virt) // for tpmfront.c
326 #endif /* CONFIG_XEN_IA64_DOM0_VP */
327 #endif /* CONFIG_XEN */
328 #endif /* __ASSEMBLY__ */
330 #endif /* _ASM_IA64_PAGE_H */