arch/m68k/mm/sun3mmu.c: Eliminate NULL test and memset after alloc_bootmem
[linux-3.10.git] / arch / m68k / mm / init.c
1 /*
2  *  linux/arch/m68k/mm/init.c
3  *
4  *  Copyright (C) 1995  Hamish Macdonald
5  *
6  *  Contains common initialization routines, specific init code moved
7  *  to motorola.c and sun3mmu.c
8  */
9
10 #include <linux/module.h>
11 #include <linux/signal.h>
12 #include <linux/sched.h>
13 #include <linux/mm.h>
14 #include <linux/swap.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/types.h>
18 #include <linux/init.h>
19 #include <linux/bootmem.h>
20
21 #include <asm/setup.h>
22 #include <asm/uaccess.h>
23 #include <asm/page.h>
24 #include <asm/pgalloc.h>
25 #include <asm/system.h>
26 #include <asm/machdep.h>
27 #include <asm/io.h>
28 #ifdef CONFIG_ATARI
29 #include <asm/atari_stram.h>
30 #endif
31 #include <asm/tlb.h>
32
33 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
34
35 static bootmem_data_t __initdata bootmem_data[MAX_NUMNODES];
36
37 pg_data_t pg_data_map[MAX_NUMNODES];
38 EXPORT_SYMBOL(pg_data_map);
39
40 int m68k_virt_to_node_shift;
41
42 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
43 pg_data_t *pg_data_table[65];
44 EXPORT_SYMBOL(pg_data_table);
45 #endif
46
47 void __init m68k_setup_node(int node)
48 {
49 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
50         struct mem_info *info = m68k_memory + node;
51         int i, end;
52
53         i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
54         end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
55         for (; i <= end; i++) {
56                 if (pg_data_table[i])
57                         printk("overlap at %u for chunk %u\n", i, node);
58                 pg_data_table[i] = pg_data_map + node;
59         }
60 #endif
61         pg_data_map[node].bdata = bootmem_data + node;
62         node_set_online(node);
63 }
64
65
66 /*
67  * ZERO_PAGE is a special page that is used for zero-initialized
68  * data and COW.
69  */
70
71 void *empty_zero_page;
72 EXPORT_SYMBOL(empty_zero_page);
73
74 void show_mem(void)
75 {
76         pg_data_t *pgdat;
77         int free = 0, total = 0, reserved = 0, shared = 0;
78         int cached = 0;
79         int i;
80
81         printk("\nMem-info:\n");
82         show_free_areas();
83         for_each_online_pgdat(pgdat) {
84                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
85                         struct page *page = pgdat->node_mem_map + i;
86                         total++;
87                         if (PageReserved(page))
88                                 reserved++;
89                         else if (PageSwapCache(page))
90                                 cached++;
91                         else if (!page_count(page))
92                                 free++;
93                         else
94                                 shared += page_count(page) - 1;
95                 }
96         }
97         printk("%d pages of RAM\n",total);
98         printk("%d free pages\n",free);
99         printk("%d reserved pages\n",reserved);
100         printk("%d pages shared\n",shared);
101         printk("%d pages swap cached\n",cached);
102 }
103
104 extern void init_pointer_table(unsigned long ptable);
105
106 /* References to section boundaries */
107
108 extern char _text[], _etext[];
109 extern char __init_begin[], __init_end[];
110
111 extern pmd_t *zero_pgtable;
112
113 void __init mem_init(void)
114 {
115         pg_data_t *pgdat;
116         int codepages = 0;
117         int datapages = 0;
118         int initpages = 0;
119         int i;
120
121 #ifdef CONFIG_ATARI
122         if (MACH_IS_ATARI)
123                 atari_stram_mem_init_hook();
124 #endif
125
126         /* this will put all memory onto the freelists */
127         totalram_pages = num_physpages = 0;
128         for_each_online_pgdat(pgdat) {
129                 num_physpages += pgdat->node_present_pages;
130
131                 totalram_pages += free_all_bootmem_node(pgdat);
132                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
133                         struct page *page = pgdat->node_mem_map + i;
134                         char *addr = page_to_virt(page);
135
136                         if (!PageReserved(page))
137                                 continue;
138                         if (addr >= _text &&
139                             addr < _etext)
140                                 codepages++;
141                         else if (addr >= __init_begin &&
142                                  addr < __init_end)
143                                 initpages++;
144                         else
145                                 datapages++;
146                 }
147         }
148
149 #ifndef CONFIG_SUN3
150         /* insert pointer tables allocated so far into the tablelist */
151         init_pointer_table((unsigned long)kernel_pg_dir);
152         for (i = 0; i < PTRS_PER_PGD; i++) {
153                 if (pgd_present(kernel_pg_dir[i]))
154                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
155         }
156
157         /* insert also pointer table that we used to unmap the zero page */
158         if (zero_pgtable)
159                 init_pointer_table((unsigned long)zero_pgtable);
160 #endif
161
162         printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
163                (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
164                totalram_pages << (PAGE_SHIFT-10),
165                codepages << (PAGE_SHIFT-10),
166                datapages << (PAGE_SHIFT-10),
167                initpages << (PAGE_SHIFT-10));
168 }
169
170 #ifdef CONFIG_BLK_DEV_INITRD
171 void free_initrd_mem(unsigned long start, unsigned long end)
172 {
173         int pages = 0;
174         for (; start < end; start += PAGE_SIZE) {
175                 ClearPageReserved(virt_to_page(start));
176                 init_page_count(virt_to_page(start));
177                 free_page(start);
178                 totalram_pages++;
179                 pages++;
180         }
181         printk ("Freeing initrd memory: %dk freed\n", pages);
182 }
183 #endif