ia64/xen-unstable

view linux-2.6-xen-sparse/include/asm-ia64/page.h @ 9762:a3cc276f2e87

[IA64] dma paravirtualization

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author awilliam@localhost
date Tue Apr 25 16:53:27 2006 -0600 (2006-04-25)
parents aab421b5ad45
children 32db03c64a12
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 xen page size != page size
240 static inline unsigned long
241 pfn_to_mfn_for_dma(unsigned long pfn)
242 {
243 unsigned long mfn;
244 mfn = HYPERVISOR_phystomach(pfn);
245 BUG_ON(mfn == 0); // XXX
246 BUG_ON(mfn == INVALID_P2M_ENTRY); // XXX
247 BUG_ON(mfn == INVALID_MFN);
248 return mfn;
249 }
251 static inline unsigned long
252 phys_to_machine_for_dma(unsigned long phys)
253 {
254 unsigned long machine =
255 pfn_to_mfn_for_dma(phys >> PAGE_SHIFT) << PAGE_SHIFT;
256 machine |= (phys & ~PAGE_MASK);
257 return machine;
258 }
260 static inline unsigned long
261 mfn_to_pfn_for_dma(unsigned long mfn)
262 {
263 unsigned long pfn;
264 pfn = HYPERVISOR_machtophys(mfn);
265 BUG_ON(pfn == 0);
266 //BUG_ON(pfn == INVALID_M2P_ENTRY);
267 return pfn;
268 }
270 static inline unsigned long
271 machine_to_phys_for_dma(unsigned long machine)
272 {
273 unsigned long phys =
274 mfn_to_pfn_for_dma(machine >> PAGE_SHIFT) << PAGE_SHIFT;
275 phys |= (machine & ~PAGE_MASK);
276 return phys;
277 }
279 #define set_phys_to_machine(pfn, mfn) do { } while (0)
280 #define xen_machphys_update(mfn, pfn) do { } while (0)
282 #define mfn_to_pfn(mfn) ({(mfn);})
283 #define mfn_to_virt(mfn) ({__va((mfn) << PAGE_SHIFT);})
284 #define pfn_to_mfn(pfn) ({(pfn);})
285 #define virt_to_mfn(virt) ({__pa(virt) >> PAGE_SHIFT;})
286 #define virt_to_machine(virt) ({__pa(virt);}) // for tpmfront.c
288 #endif /* CONFIG_XEN_IA64_DOM0_VP */
289 #endif /* CONFIG_XEN */
290 #endif /* __ASSEMBLY__ */
292 #endif /* _ASM_IA64_PAGE_H */