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
mem_prof_init(void)35 static void __init mem_prof_init(void)
36 {
37 unsigned long start_pfn, holes, free_pfn;
38 const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
39 unsigned long ul;
40 mem_prof_t *mp;
41
42 /* Node#0 SDRAM */
43 mp = &mem_prof[0];
44 mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
45 mp->pages = PFN_DOWN(CONFIG_MEMORY_SIZE);
46 mp->holes = 0;
47 mp->free_pfn = PFN_UP(__pa(_end));
48
49 /* Node#1 internal SRAM */
50 mp = &mem_prof[1];
51 start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
52 holes = 0;
53 if (start_pfn & (zone_alignment - 1)) {
54 ul = zone_alignment;
55 while (start_pfn >= ul)
56 ul += zone_alignment;
57
58 start_pfn = ul - zone_alignment;
59 holes = free_pfn - start_pfn;
60 }
61
62 mp->start_pfn = start_pfn;
63 mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
64 mp->holes = holes;
65 mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
66 }
67
setup_memory(void)68 unsigned long __init setup_memory(void)
69 {
70 unsigned long bootmap_size;
71 unsigned long min_pfn;
72 int nid;
73 mem_prof_t *mp;
74
75 max_low_pfn = 0;
76 min_low_pfn = -1;
77
78 mem_prof_init();
79
80 for_each_online_node(nid) {
81 mp = &mem_prof[nid];
82 NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
83 NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
84 min_pfn = mp->start_pfn;
85 max_pfn = mp->start_pfn + mp->pages;
86 bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
87 mp->start_pfn, max_pfn);
88
89 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
90 PFN_PHYS(mp->pages));
91
92 reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
93 PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size,
94 BOOTMEM_DEFAULT);
95
96 if (max_low_pfn < max_pfn)
97 max_low_pfn = max_pfn;
98
99 if (min_low_pfn > min_pfn)
100 min_low_pfn = min_pfn;
101 }
102
103 #ifdef CONFIG_BLK_DEV_INITRD
104 if (LOADER_TYPE && INITRD_START) {
105 if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
106 reserve_bootmem_node(NODE_DATA(0), INITRD_START,
107 INITRD_SIZE, BOOTMEM_DEFAULT);
108 initrd_start = INITRD_START + PAGE_OFFSET;
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%08llx)\ndisabling initrd\n",
115 INITRD_START + INITRD_SIZE,
116 (unsigned long long)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) (NODE_DATA(nid)->bdata->node_min_pfn)
127 #define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
128
zone_sizes_init(void)129 unsigned long __init zone_sizes_init(void)
130 {
131 unsigned long zones_size[MAX_NR_ZONES], zholes_size[MAX_NR_ZONES];
132 unsigned long low, start_pfn;
133 unsigned long holes = 0;
134 int nid, i;
135 mem_prof_t *mp;
136
137 for_each_online_node(nid) {
138 mp = &mem_prof[nid];
139 for (i = 0 ; i < MAX_NR_ZONES ; i++) {
140 zones_size[i] = 0;
141 zholes_size[i] = 0;
142 }
143 start_pfn = START_PFN(nid);
144 low = MAX_LOW_PFN(nid);
145 zones_size[ZONE_DMA] = low - start_pfn;
146 zholes_size[ZONE_DMA] = mp->holes;
147 holes += zholes_size[ZONE_DMA];
148
149 free_area_init_node(nid, zones_size, start_pfn, zholes_size);
150 }
151
152 /*
153 * For test
154 * Use all area of internal RAM.
155 * see __alloc_pages()
156 */
157 NODE_DATA(1)->node_zones->pages_min = 0;
158 NODE_DATA(1)->node_zones->pages_low = 0;
159 NODE_DATA(1)->node_zones->pages_high = 0;
160
161 return holes;
162 }
163