1 /*
2  * Written by Kanoj Sarcar (kanoj@sgi.com) Aug 99
3  * Adapted for the alpha wildfire architecture Jan 2001.
4  */
5 #ifndef _ASM_MMZONE_H_
6 #define _ASM_MMZONE_H_
7 
8 #include <asm/smp.h>
9 
10 struct bootmem_data_t; /* stupid forward decl. */
11 
12 /*
13  * Following are macros that are specific to this numa platform.
14  */
15 
16 extern pg_data_t node_data[];
17 
18 #define alpha_pa_to_nid(pa)		\
19         (alpha_mv.pa_to_nid 		\
20 	 ? alpha_mv.pa_to_nid(pa)	\
21 	 : (0))
22 #define node_mem_start(nid)		\
23         (alpha_mv.node_mem_start 	\
24 	 ? alpha_mv.node_mem_start(nid) \
25 	 : (0UL))
26 #define node_mem_size(nid)		\
27         (alpha_mv.node_mem_size 	\
28 	 ? alpha_mv.node_mem_size(nid) 	\
29 	 : ((nid) ? (0UL) : (~0UL)))
30 
31 #define pa_to_nid(pa)		alpha_pa_to_nid(pa)
32 #define NODE_DATA(nid)		(&node_data[(nid)])
33 
34 #define node_localnr(pfn, nid)	((pfn) - NODE_DATA(nid)->node_start_pfn)
35 
36 #if 1
37 #define PLAT_NODE_DATA_LOCALNR(p, n)	\
38 	(((p) >> PAGE_SHIFT) - PLAT_NODE_DATA(n)->gendata.node_start_pfn)
39 #else
40 static inline unsigned long
PLAT_NODE_DATA_LOCALNR(unsigned long p,int n)41 PLAT_NODE_DATA_LOCALNR(unsigned long p, int n)
42 {
43 	unsigned long temp;
44 	temp = p >> PAGE_SHIFT;
45 	return temp - PLAT_NODE_DATA(n)->gendata.node_start_pfn;
46 }
47 #endif
48 
49 #ifdef CONFIG_DISCONTIGMEM
50 
51 /*
52  * Following are macros that each numa implementation must define.
53  */
54 
55 /*
56  * Given a kernel address, find the home node of the underlying memory.
57  */
58 #define kvaddr_to_nid(kaddr)	pa_to_nid(__pa(kaddr))
59 #define node_start_pfn(nid)	(NODE_DATA(nid)->node_start_pfn)
60 
61 /*
62  * Given a kaddr, LOCAL_BASE_ADDR finds the owning node of the memory
63  * and returns the kaddr corresponding to first physical page in the
64  * node's mem_map.
65  */
66 #define LOCAL_BASE_ADDR(kaddr)						  \
67     ((unsigned long)__va(NODE_DATA(kvaddr_to_nid(kaddr))->node_start_pfn  \
68 			 << PAGE_SHIFT))
69 
70 /* XXX: FIXME -- wli */
71 #define kern_addr_valid(kaddr)	(0)
72 
73 #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
74 
75 #define VALID_PAGE(page)	(((page) - mem_map) < max_mapnr)
76 
77 #define pmd_page(pmd)		(pfn_to_page(pmd_val(pmd) >> 32))
78 #define pgd_page(pgd)		(pfn_to_page(pgd_val(pgd) >> 32))
79 #define pte_pfn(pte)		(pte_val(pte) >> 32)
80 
81 #define mk_pte(page, pgprot)						     \
82 ({								 	     \
83 	pte_t pte;                                                           \
84 	unsigned long pfn;                                                   \
85 									     \
86 	pfn = page_to_pfn(page) << 32; \
87 	pte_val(pte) = pfn | pgprot_val(pgprot);			     \
88 									     \
89 	pte;								     \
90 })
91 
92 #define pte_page(x)							\
93 ({									\
94        	unsigned long kvirt;						\
95 	struct page * __xx;						\
96 									\
97 	kvirt = (unsigned long)__va(pte_val(x) >> (32-PAGE_SHIFT));	\
98 	__xx = virt_to_page(kvirt);					\
99 									\
100 	__xx;                                                           \
101 })
102 
103 #define page_to_pa(page)						\
104 	(page_to_pfn(page) << PAGE_SHIFT)
105 
106 #define pfn_to_nid(pfn)		pa_to_nid(((u64)(pfn) << PAGE_SHIFT))
107 #define pfn_valid(pfn)							\
108 	(((pfn) - node_start_pfn(pfn_to_nid(pfn))) <			\
109 	 node_spanned_pages(pfn_to_nid(pfn)))					\
110 
111 #define virt_addr_valid(kaddr)	pfn_valid((__pa(kaddr) >> PAGE_SHIFT))
112 
113 #endif /* CONFIG_DISCONTIGMEM */
114 
115 #endif /* _ASM_MMZONE_H_ */
116