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);
23static bootmem_data_t node_bdata[MAX_NUMNODES] __initdata;
24
25pg_data_t m32r_node_data[MAX_NUMNODES];
26
27/* Memory profile */
28typedef struct {
29	unsigned long start_pfn;
30	unsigned long pages;
31	unsigned long holes;
32	unsigned long free_pfn;
33} mem_prof_t;
34static mem_prof_t mem_prof[MAX_NUMNODES];
35
36static void __init mem_prof_init(void)
37{
38	unsigned long start_pfn, holes, free_pfn;
39	const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
40	unsigned long ul;
41	mem_prof_t *mp;
42
43	/* Node#0 SDRAM */
44	mp = &mem_prof[0];
45	mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
46	mp->pages = PFN_DOWN(CONFIG_MEMORY_SIZE);
47	mp->holes = 0;
48	mp->free_pfn = PFN_UP(__pa(_end));
49
50	/* Node#1 internal SRAM */
51	mp = &mem_prof[1];
52	start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
53	holes = 0;
54	if (start_pfn & (zone_alignment - 1)) {
55		ul = zone_alignment;
56		while (start_pfn >= ul)
57			ul += zone_alignment;
58
59		start_pfn = ul - zone_alignment;
60		holes = free_pfn - start_pfn;
61	}
62
63	mp->start_pfn = start_pfn;
64	mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
65	mp->holes = holes;
66	mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
67}
68
69unsigned long __init setup_memory(void)
70{
71	unsigned long bootmap_size;
72	unsigned long min_pfn;
73	int nid;
74	mem_prof_t *mp;
75
76	max_low_pfn = 0;
77	min_low_pfn = -1;
78
79	mem_prof_init();
80
81	for_each_online_node(nid) {
82		mp = &mem_prof[nid];
83		NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
84		NODE_DATA(nid)->bdata = &node_bdata[nid];
85		min_pfn = mp->start_pfn;
86		max_pfn = mp->start_pfn + mp->pages;
87		bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
88			mp->start_pfn, max_pfn);
89
90		free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
91			PFN_PHYS(mp->pages));
92
93		reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
94			PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size);
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);
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%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
130unsigned 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	for_each_online_node(nid) {
139		mp = &mem_prof[nid];
140		for (i = 0 ; i < MAX_NR_ZONES ; i++) {
141			zones_size[i] = 0;
142			zholes_size[i] = 0;
143		}
144		start_pfn = START_PFN(nid);
145		low = MAX_LOW_PFN(nid);
146		zones_size[ZONE_DMA] = low - start_pfn;
147		zholes_size[ZONE_DMA] = mp->holes;
148		holes += zholes_size[ZONE_DMA];
149
150		free_area_init_node(nid, NODE_DATA(nid), zones_size,
151			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->pages_min = 0;
160	NODE_DATA(1)->node_zones->pages_low = 0;
161	NODE_DATA(1)->node_zones->pages_high = 0;
162
163	return holes;
164}
165