Linux-2.6.12-rc2
[linux-2.6.git] / arch / m32r / mm / discontig.c
1 /*
2  *  linux/arch/m32r/mm/discontig.c
3  *
4  *  Discontig memory support
5  *
6  *  Copyright (c) 2003  Hitoshi Yamamoto
7  */
8
9 #include <linux/config.h>
10 #include <linux/mm.h>
11 #include <linux/bootmem.h>
12 #include <linux/mmzone.h>
13 #include <linux/initrd.h>
14 #include <linux/nodemask.h>
15
16 #include <asm/setup.h>
17
18 extern char _end[];
19
20 struct pglist_data *node_data[MAX_NUMNODES];
21 static bootmem_data_t node_bdata[MAX_NUMNODES] __initdata;
22
23 pg_data_t m32r_node_data[MAX_NUMNODES];
24
25 /* Memory profile */
26 typedef struct {
27         unsigned long start_pfn;
28         unsigned long pages;
29         unsigned long holes;
30         unsigned long free_pfn;
31 } mem_prof_t;
32 static mem_prof_t mem_prof[MAX_NUMNODES];
33
34 static void __init mem_prof_init(void)
35 {
36         unsigned long start_pfn, holes, free_pfn;
37         const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
38         unsigned long ul;
39         mem_prof_t *mp;
40
41         /* Node#0 SDRAM */
42         mp = &mem_prof[0];
43         mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
44         mp->pages = PFN_DOWN(CONFIG_MEMORY_SIZE);
45         mp->holes = 0;
46         mp->free_pfn = PFN_UP(__pa(_end));
47
48         /* Node#1 internal SRAM */
49         mp = &mem_prof[1];
50         start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
51         holes = 0;
52         if (start_pfn & (zone_alignment - 1)) {
53                 ul = zone_alignment;
54                 while (start_pfn >= ul)
55                         ul += zone_alignment;
56
57                 start_pfn = ul - zone_alignment;
58                 holes = free_pfn - start_pfn;
59         }
60
61         mp->start_pfn = start_pfn;
62         mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
63         mp->holes = holes;
64         mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
65 }
66
67 unsigned long __init setup_memory(void)
68 {
69         unsigned long bootmap_size;
70         unsigned long min_pfn;
71         int nid;
72         mem_prof_t *mp;
73
74         max_low_pfn = 0;
75         min_low_pfn = -1;
76
77         mem_prof_init();
78
79         for_each_online_node(nid) {
80                 mp = &mem_prof[nid];
81                 NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
82                 NODE_DATA(nid)->bdata = &node_bdata[nid];
83                 min_pfn = mp->start_pfn;
84                 max_pfn = mp->start_pfn + mp->pages;
85                 bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
86                         mp->start_pfn, max_pfn);
87
88                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
89                         PFN_PHYS(mp->pages));
90
91                 reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
92                         PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size);
93
94                 if (max_low_pfn < max_pfn)
95                         max_low_pfn = max_pfn;
96
97                 if (min_low_pfn > min_pfn)
98                         min_low_pfn = min_pfn;
99         }
100
101 #ifdef CONFIG_BLK_DEV_INITRD
102         if (LOADER_TYPE && INITRD_START) {
103                 if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
104                         reserve_bootmem_node(NODE_DATA(0), INITRD_START,
105                                 INITRD_SIZE);
106                         initrd_start = INITRD_START ?
107                                 INITRD_START + PAGE_OFFSET : 0;
108
109                         initrd_end = initrd_start + INITRD_SIZE;
110                         printk("initrd:start[%08lx],size[%08lx]\n",
111                                 initrd_start, INITRD_SIZE);
112                 } else {
113                         printk("initrd extends beyond end of memory "
114                                 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
115                                 INITRD_START + INITRD_SIZE,
116                                 PFN_PHYS(max_low_pfn));
117
118                         initrd_start = 0;
119                 }
120         }
121 #endif  /* CONFIG_BLK_DEV_INITRD */
122
123         return max_low_pfn;
124 }
125
126 #define START_PFN(nid)  \
127         (NODE_DATA(nid)->bdata->node_boot_start >> PAGE_SHIFT)
128 #define MAX_LOW_PFN(nid)        (NODE_DATA(nid)->bdata->node_low_pfn)
129
130 unsigned long __init zone_sizes_init(void)
131 {
132         unsigned long zones_size[MAX_NR_ZONES], zholes_size[MAX_NR_ZONES];
133         unsigned long low, start_pfn;
134         unsigned long holes = 0;
135         int nid, i;
136         mem_prof_t *mp;
137
138         pgdat_list = NULL;
139         for (nid = num_online_nodes() - 1 ; nid >= 0 ; nid--) {
140                 NODE_DATA(nid)->pgdat_next = pgdat_list;
141                 pgdat_list = NODE_DATA(nid);
142         }
143
144         for_each_online_node(nid) {
145                 mp = &mem_prof[nid];
146                 for (i = 0 ; i < MAX_NR_ZONES ; i++) {
147                         zones_size[i] = 0;
148                         zholes_size[i] = 0;
149                 }
150                 start_pfn = START_PFN(nid);
151                 low = MAX_LOW_PFN(nid);
152                 zones_size[ZONE_DMA] = low - start_pfn;
153                 zholes_size[ZONE_DMA] = mp->holes;
154                 holes += zholes_size[ZONE_DMA];
155
156                 free_area_init_node(nid, NODE_DATA(nid), zones_size,
157                         start_pfn, zholes_size);
158         }
159
160         /*
161          * For test
162          *  Use all area of internal RAM.
163          *  see __alloc_pages()
164          */
165         NODE_DATA(1)->node_zones->pages_min = 0;
166         NODE_DATA(1)->node_zones->pages_low = 0;
167         NODE_DATA(1)->node_zones->pages_high = 0;
168
169         return holes;
170 }
171