5d2858f6eede4283bbb7c61717d021e3cf60797c
[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/mm.h>
10 #include <linux/bootmem.h>
11 #include <linux/mmzone.h>
12 #include <linux/initrd.h>
13 #include <linux/nodemask.h>
14 #include <linux/module.h>
15 #include <linux/pfn.h>
16
17 #include <asm/setup.h>
18
19 extern char _end[];
20
21 struct pglist_data *node_data[MAX_NUMNODES];
22 EXPORT_SYMBOL(node_data);
23
24 pg_data_t m32r_node_data[MAX_NUMNODES];
25
26 /* Memory profile */
27 typedef struct {
28         unsigned long start_pfn;
29         unsigned long pages;
30         unsigned long holes;
31         unsigned long free_pfn;
32 } mem_prof_t;
33 static mem_prof_t mem_prof[MAX_NUMNODES];
34
35 extern unsigned long memory_start;
36 extern unsigned long memory_end;
37
38 static void __init mem_prof_init(void)
39 {
40         unsigned long start_pfn, holes, free_pfn;
41         const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
42         unsigned long ul;
43         mem_prof_t *mp;
44
45         /* Node#0 SDRAM */
46         mp = &mem_prof[0];
47         mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
48         mp->pages = PFN_DOWN(memory_end - memory_start);
49         mp->holes = 0;
50         mp->free_pfn = PFN_UP(__pa(_end));
51
52         /* Node#1 internal SRAM */
53         mp = &mem_prof[1];
54         start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
55         holes = 0;
56         if (start_pfn & (zone_alignment - 1)) {
57                 ul = zone_alignment;
58                 while (start_pfn >= ul)
59                         ul += zone_alignment;
60
61                 start_pfn = ul - zone_alignment;
62                 holes = free_pfn - start_pfn;
63         }
64
65         mp->start_pfn = start_pfn;
66         mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
67         mp->holes = holes;
68         mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
69 }
70
71 unsigned long __init setup_memory(void)
72 {
73         unsigned long bootmap_size;
74         unsigned long min_pfn;
75         int nid;
76         mem_prof_t *mp;
77
78         max_low_pfn = 0;
79         min_low_pfn = -1;
80
81         mem_prof_init();
82
83         for_each_online_node(nid) {
84                 mp = &mem_prof[nid];
85                 NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
86                 NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
87                 min_pfn = mp->start_pfn;
88                 max_pfn = mp->start_pfn + mp->pages;
89                 bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
90                         mp->start_pfn, max_pfn);
91
92                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
93                         PFN_PHYS(mp->pages));
94
95                 reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
96                         PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size,
97                         BOOTMEM_DEFAULT);
98
99                 if (max_low_pfn < max_pfn)
100                         max_low_pfn = max_pfn;
101
102                 if (min_low_pfn > min_pfn)
103                         min_low_pfn = min_pfn;
104         }
105
106 #ifdef CONFIG_BLK_DEV_INITRD
107         if (LOADER_TYPE && INITRD_START) {
108                 if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
109                         reserve_bootmem_node(NODE_DATA(0), INITRD_START,
110                                 INITRD_SIZE, BOOTMEM_DEFAULT);
111                         initrd_start = INITRD_START + PAGE_OFFSET;
112                         initrd_end = initrd_start + INITRD_SIZE;
113                         printk("initrd:start[%08lx],size[%08lx]\n",
114                                 initrd_start, INITRD_SIZE);
115                 } else {
116                         printk("initrd extends beyond end of memory "
117                                 "(0x%08lx > 0x%08llx)\ndisabling initrd\n",
118                                 INITRD_START + INITRD_SIZE,
119                                 (unsigned long long)PFN_PHYS(max_low_pfn));
120
121                         initrd_start = 0;
122                 }
123         }
124 #endif  /* CONFIG_BLK_DEV_INITRD */
125
126         return max_low_pfn;
127 }
128
129 #define START_PFN(nid)          (NODE_DATA(nid)->bdata->node_min_pfn)
130 #define MAX_LOW_PFN(nid)        (NODE_DATA(nid)->bdata->node_low_pfn)
131
132 unsigned long __init zone_sizes_init(void)
133 {
134         unsigned long zones_size[MAX_NR_ZONES], zholes_size[MAX_NR_ZONES];
135         unsigned long low, start_pfn;
136         unsigned long holes = 0;
137         int nid, i;
138         mem_prof_t *mp;
139
140         for_each_online_node(nid) {
141                 mp = &mem_prof[nid];
142                 for (i = 0 ; i < MAX_NR_ZONES ; i++) {
143                         zones_size[i] = 0;
144                         zholes_size[i] = 0;
145                 }
146                 start_pfn = START_PFN(nid);
147                 low = MAX_LOW_PFN(nid);
148                 zones_size[ZONE_DMA] = low - start_pfn;
149                 zholes_size[ZONE_DMA] = mp->holes;
150                 holes += zholes_size[ZONE_DMA];
151
152                 free_area_init_node(nid, zones_size, start_pfn, zholes_size);
153         }
154
155         /*
156          * For test
157          *  Use all area of internal RAM.
158          *  see __alloc_pages()
159          */
160         NODE_DATA(1)->node_zones->watermark[WMARK_MIN] = 0;
161         NODE_DATA(1)->node_zones->watermark[WMARK_LOW] = 0;
162         NODE_DATA(1)->node_zones->watermark[WMARK_HIGH] = 0;
163
164         return holes;
165 }