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192.168.1.100 / T103 / f818a87834f89b73fe706f85272b12cf466a01c5 / . / src / kernel / linux / v4.14 / arch / m32r / mm / discontig.c
blob: eb8e7966dcaff177ea417526a8a3379d9c107633 [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +0800[diff] [blame]1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/m32r/mm/discontig.c
4 *
5 * Discontig memory support
6 *
7 * Copyright (c) 2003 Hitoshi Yamamoto
8 */
9
10#include <linux/mm.h>
11#include <linux/bootmem.h>
12#include <linux/mmzone.h>
13#include <linux/initrd.h>
14#include <linux/nodemask.h>
15#include <linux/module.h>
16#include <linux/pfn.h>
17
18#include <asm/setup.h>
19
20extern char _end[];
21
22struct pglist_data *node_data[MAX_NUMNODES];
23EXPORT_SYMBOL(node_data);
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
36extern unsigned long memory_start;
37extern unsigned long memory_end;
38
39static void __init mem_prof_init(void)
40{
41 unsigned long start_pfn, holes, free_pfn;
42 const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
43 unsigned long ul;
44 mem_prof_t *mp;
45
46 /* Node#0 SDRAM */
47 mp = &mem_prof[0];
48 mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
49 mp->pages = PFN_DOWN(memory_end - memory_start);
50 mp->holes = 0;
51 mp->free_pfn = PFN_UP(__pa(_end));
52
53 /* Node#1 internal SRAM */
54 mp = &mem_prof[1];
55 start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
56 holes = 0;
57 if (start_pfn & (zone_alignment - 1)) {
58 ul = zone_alignment;
59 while (start_pfn >= ul)
60 ul += zone_alignment;
61
62 start_pfn = ul - zone_alignment;
63 holes = free_pfn - start_pfn;
64 }
65
66 mp->start_pfn = start_pfn;
67 mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
68 mp->holes = holes;
69 mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
70}
71
72unsigned long __init setup_memory(void)
73{
74 unsigned long bootmap_size;
75 unsigned long min_pfn;
76 int nid;
77 mem_prof_t *mp;
78
79 max_low_pfn = 0;
80 min_low_pfn = -1;
81
82 mem_prof_init();
83
84 for_each_online_node(nid) {
85 mp = &mem_prof[nid];
86 NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
87 NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
88 min_pfn = mp->start_pfn;
89 max_pfn = mp->start_pfn + mp->pages;
90 bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
91 mp->start_pfn, max_pfn);
92
93 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
94 PFN_PHYS(mp->pages));
95
96 reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
97 PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size,
98 BOOTMEM_DEFAULT);
99
100 if (max_low_pfn < max_pfn)
101 max_low_pfn = max_pfn;
102
103 if (min_low_pfn > min_pfn)
104 min_low_pfn = min_pfn;
105 }
106
107#ifdef CONFIG_BLK_DEV_INITRD
108 if (LOADER_TYPE && INITRD_START) {
109 if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
110 reserve_bootmem_node(NODE_DATA(0), INITRD_START,
111 INITRD_SIZE, BOOTMEM_DEFAULT);
112 initrd_start = INITRD_START + PAGE_OFFSET;
113 initrd_end = initrd_start + INITRD_SIZE;
114 printk("initrd:start[%08lx],size[%08lx]\n",
115 initrd_start, INITRD_SIZE);
116 } else {
117 printk("initrd extends beyond end of memory "
118 "(0x%08lx > 0x%08llx)\ndisabling initrd\n",
119 INITRD_START + INITRD_SIZE,
120 (unsigned long long)PFN_PHYS(max_low_pfn));
121
122 initrd_start = 0;
123 }
124 }
125#endif /* CONFIG_BLK_DEV_INITRD */
126
127 return max_low_pfn;
128}
129
130#define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn)
131#define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
132
133void __init zone_sizes_init(void)
134{
135 unsigned long zones_size[MAX_NR_ZONES], zholes_size[MAX_NR_ZONES];
136 unsigned long low, start_pfn;
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
151 node_set_state(nid, N_NORMAL_MEMORY);
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}