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
mem_prof_init(void)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
setup_memory(void)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
zone_sizes_init(void)132 void __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 int nid, i;
137 mem_prof_t *mp;
138
139 for_each_online_node(nid) {
140 mp = &mem_prof[nid];
141 for (i = 0 ; i < MAX_NR_ZONES ; i++) {
142 zones_size[i] = 0;
143 zholes_size[i] = 0;
144 }
145 start_pfn = START_PFN(nid);
146 low = MAX_LOW_PFN(nid);
147 zones_size[ZONE_DMA] = low - start_pfn;
148 zholes_size[ZONE_DMA] = mp->holes;
149
150 node_set_state(nid, N_NORMAL_MEMORY);
151 free_area_init_node(nid, zones_size, start_pfn, zholes_size);
152 }
153
154 /*
155 * For test
156 * Use all area of internal RAM.
157 * see __alloc_pages()
158 */
159 NODE_DATA(1)->node_zones->watermark[WMARK_MIN] = 0;
160 NODE_DATA(1)->node_zones->watermark[WMARK_LOW] = 0;
161 NODE_DATA(1)->node_zones->watermark[WMARK_HIGH] = 0;
162 }
163