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
19extern char _end[];
20
21struct pglist_data *node_data[MAX_NUMNODES];
22EXPORT_SYMBOL(node_data);
23
24pg_data_t m32r_node_data[MAX_NUMNODES];
25
26/* Memory profile */
27typedef struct {
28	unsigned long start_pfn;
29	unsigned long pages;
30	unsigned long holes;
31	unsigned long free_pfn;
32} mem_prof_t;
33static mem_prof_t mem_prof[MAX_NUMNODES];
34
35extern unsigned long memory_start;
36extern unsigned long memory_end;
37
38static 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
71unsigned 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
132void __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