Loading...
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#include <linux/gfp.h>
21
22#include <asm/setup.h>
23#include <asm/uaccess.h>
24#include <asm/page.h>
25#include <asm/pgalloc.h>
26#include <asm/traps.h>
27#include <asm/machdep.h>
28#include <asm/io.h>
29#ifdef CONFIG_ATARI
30#include <asm/atari_stram.h>
31#endif
32#include <asm/sections.h>
33#include <asm/tlb.h>
34
35pg_data_t pg_data_map[MAX_NUMNODES];
36EXPORT_SYMBOL(pg_data_map);
37
38int m68k_virt_to_node_shift;
39
40#ifndef CONFIG_SINGLE_MEMORY_CHUNK
41pg_data_t *pg_data_table[65];
42EXPORT_SYMBOL(pg_data_table);
43#endif
44
45void __init m68k_setup_node(int node)
46{
47#ifndef CONFIG_SINGLE_MEMORY_CHUNK
48 struct mem_info *info = m68k_memory + node;
49 int i, end;
50
51 i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
52 end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
53 for (; i <= end; i++) {
54 if (pg_data_table[i])
55 printk("overlap at %u for chunk %u\n", i, node);
56 pg_data_table[i] = pg_data_map + node;
57 }
58#endif
59 pg_data_map[node].bdata = bootmem_node_data + node;
60 node_set_online(node);
61}
62
63
64/*
65 * ZERO_PAGE is a special page that is used for zero-initialized
66 * data and COW.
67 */
68
69void *empty_zero_page;
70EXPORT_SYMBOL(empty_zero_page);
71
72extern void init_pointer_table(unsigned long ptable);
73
74/* References to section boundaries */
75
76extern pmd_t *zero_pgtable;
77
78#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
79#define VECTORS &vectors[0]
80#else
81#define VECTORS _ramvec
82#endif
83
84void __init print_memmap(void)
85{
86#define UL(x) ((unsigned long) (x))
87#define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
88#define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
89#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
90
91 pr_notice("Virtual kernel memory layout:\n"
92 " vector : 0x%08lx - 0x%08lx (%4ld KiB)\n"
93 " kmap : 0x%08lx - 0x%08lx (%4ld MiB)\n"
94 " vmalloc : 0x%08lx - 0x%08lx (%4ld MiB)\n"
95 " lowmem : 0x%08lx - 0x%08lx (%4ld MiB)\n"
96 " .init : 0x%p" " - 0x%p" " (%4d KiB)\n"
97 " .text : 0x%p" " - 0x%p" " (%4d KiB)\n"
98 " .data : 0x%p" " - 0x%p" " (%4d KiB)\n"
99 " .bss : 0x%p" " - 0x%p" " (%4d KiB)\n",
100 MLK(VECTORS, VECTORS + 256),
101 MLM(KMAP_START, KMAP_END),
102 MLM(VMALLOC_START, VMALLOC_END),
103 MLM(PAGE_OFFSET, (unsigned long)high_memory),
104 MLK_ROUNDUP(__init_begin, __init_end),
105 MLK_ROUNDUP(_stext, _etext),
106 MLK_ROUNDUP(_sdata, _edata),
107 MLK_ROUNDUP(_sbss, _ebss));
108}
109
110void __init mem_init(void)
111{
112 pg_data_t *pgdat;
113 int codepages = 0;
114 int datapages = 0;
115 int initpages = 0;
116 int i;
117
118 /* this will put all memory onto the freelists */
119 totalram_pages = num_physpages = 0;
120 for_each_online_pgdat(pgdat) {
121 num_physpages += pgdat->node_present_pages;
122
123 totalram_pages += free_all_bootmem_node(pgdat);
124 for (i = 0; i < pgdat->node_spanned_pages; i++) {
125 struct page *page = pgdat->node_mem_map + i;
126 char *addr = page_to_virt(page);
127
128 if (!PageReserved(page))
129 continue;
130 if (addr >= _text &&
131 addr < _etext)
132 codepages++;
133 else if (addr >= __init_begin &&
134 addr < __init_end)
135 initpages++;
136 else
137 datapages++;
138 }
139 }
140
141#if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
142 /* insert pointer tables allocated so far into the tablelist */
143 init_pointer_table((unsigned long)kernel_pg_dir);
144 for (i = 0; i < PTRS_PER_PGD; i++) {
145 if (pgd_present(kernel_pg_dir[i]))
146 init_pointer_table(__pgd_page(kernel_pg_dir[i]));
147 }
148
149 /* insert also pointer table that we used to unmap the zero page */
150 if (zero_pgtable)
151 init_pointer_table((unsigned long)zero_pgtable);
152#endif
153
154 printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
155 nr_free_pages() << (PAGE_SHIFT-10),
156 totalram_pages << (PAGE_SHIFT-10),
157 codepages << (PAGE_SHIFT-10),
158 datapages << (PAGE_SHIFT-10),
159 initpages << (PAGE_SHIFT-10));
160 print_memmap();
161}
162
163#ifdef CONFIG_BLK_DEV_INITRD
164void free_initrd_mem(unsigned long start, unsigned long end)
165{
166 int pages = 0;
167 for (; start < end; start += PAGE_SIZE) {
168 ClearPageReserved(virt_to_page(start));
169 init_page_count(virt_to_page(start));
170 free_page(start);
171 totalram_pages++;
172 pages++;
173 }
174 printk ("Freeing initrd memory: %dk freed\n", pages);
175}
176#endif