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
35 /*
36 * ZERO_PAGE is a special page that is used for zero-initialized
37 * data and COW.
38 */
39 void *empty_zero_page;
40 EXPORT_SYMBOL(empty_zero_page);
41
42 #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
43 extern void init_pointer_table(unsigned long ptable);
44 extern pmd_t *zero_pgtable;
45 #endif
46
47 #ifdef CONFIG_MMU
48
49 pg_data_t pg_data_map[MAX_NUMNODES];
50 EXPORT_SYMBOL(pg_data_map);
51
52 int m68k_virt_to_node_shift;
53
54 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
55 pg_data_t *pg_data_table[65];
56 EXPORT_SYMBOL(pg_data_table);
57 #endif
58
m68k_setup_node(int node)59 void __init m68k_setup_node(int node)
60 {
61 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
62 struct mem_info *info = m68k_memory + node;
63 int i, end;
64
65 i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
66 end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
67 for (; i <= end; i++) {
68 if (pg_data_table[i])
69 printk("overlap at %u for chunk %u\n", i, node);
70 pg_data_table[i] = pg_data_map + node;
71 }
72 #endif
73 pg_data_map[node].bdata = bootmem_node_data + node;
74 node_set_online(node);
75 }
76
77 #else /* CONFIG_MMU */
78
79 /*
80 * paging_init() continues the virtual memory environment setup which
81 * was begun by the code in arch/head.S.
82 * The parameters are pointers to where to stick the starting and ending
83 * addresses of available kernel virtual memory.
84 */
paging_init(void)85 void __init paging_init(void)
86 {
87 /*
88 * Make sure start_mem is page aligned, otherwise bootmem and
89 * page_alloc get different views of the world.
90 */
91 unsigned long end_mem = memory_end & PAGE_MASK;
92 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
93
94 high_memory = (void *) end_mem;
95
96 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
97 memset(empty_zero_page, 0, PAGE_SIZE);
98
99 /*
100 * Set up SFC/DFC registers (user data space).
101 */
102 set_fs (USER_DS);
103
104 zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
105 free_area_init(zones_size);
106 }
107
108 #endif /* CONFIG_MMU */
109
free_initmem(void)110 void free_initmem(void)
111 {
112 #ifndef CONFIG_MMU_SUN3
113 free_initmem_default(0);
114 #endif /* CONFIG_MMU_SUN3 */
115 }
116
117 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
118 #define VECTORS &vectors[0]
119 #else
120 #define VECTORS _ramvec
121 #endif
122
print_memmap(void)123 void __init print_memmap(void)
124 {
125 #define UL(x) ((unsigned long) (x))
126 #define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
127 #define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
128 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
129
130 pr_notice("Virtual kernel memory layout:\n"
131 " vector : 0x%08lx - 0x%08lx (%4ld KiB)\n"
132 " kmap : 0x%08lx - 0x%08lx (%4ld MiB)\n"
133 " vmalloc : 0x%08lx - 0x%08lx (%4ld MiB)\n"
134 " lowmem : 0x%08lx - 0x%08lx (%4ld MiB)\n"
135 " .init : 0x%p" " - 0x%p" " (%4d KiB)\n"
136 " .text : 0x%p" " - 0x%p" " (%4d KiB)\n"
137 " .data : 0x%p" " - 0x%p" " (%4d KiB)\n"
138 " .bss : 0x%p" " - 0x%p" " (%4d KiB)\n",
139 MLK(VECTORS, VECTORS + 256),
140 MLM(KMAP_START, KMAP_END),
141 MLM(VMALLOC_START, VMALLOC_END),
142 MLM(PAGE_OFFSET, (unsigned long)high_memory),
143 MLK_ROUNDUP(__init_begin, __init_end),
144 MLK_ROUNDUP(_stext, _etext),
145 MLK_ROUNDUP(_sdata, _edata),
146 MLK_ROUNDUP(__bss_start, __bss_stop));
147 }
148
mem_init(void)149 void __init mem_init(void)
150 {
151 pg_data_t *pgdat;
152 int codepages = 0;
153 int datapages = 0;
154 int initpages = 0;
155 int i;
156
157 /* this will put all memory onto the freelists */
158 totalram_pages = num_physpages = 0;
159 for_each_online_pgdat(pgdat) {
160 num_physpages += pgdat->node_present_pages;
161
162 totalram_pages += free_all_bootmem_node(pgdat);
163 for (i = 0; i < pgdat->node_spanned_pages; i++) {
164 struct page *page = pgdat->node_mem_map + i;
165 char *addr = page_to_virt(page);
166
167 if (!PageReserved(page))
168 continue;
169 if (addr >= _text &&
170 addr < _etext)
171 codepages++;
172 else if (addr >= __init_begin &&
173 addr < __init_end)
174 initpages++;
175 else
176 datapages++;
177 }
178 }
179
180 #if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
181 /* insert pointer tables allocated so far into the tablelist */
182 init_pointer_table((unsigned long)kernel_pg_dir);
183 for (i = 0; i < PTRS_PER_PGD; i++) {
184 if (pgd_present(kernel_pg_dir[i]))
185 init_pointer_table(__pgd_page(kernel_pg_dir[i]));
186 }
187
188 /* insert also pointer table that we used to unmap the zero page */
189 if (zero_pgtable)
190 init_pointer_table((unsigned long)zero_pgtable);
191 #endif
192
193 pr_info("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
194 nr_free_pages() << (PAGE_SHIFT-10),
195 totalram_pages << (PAGE_SHIFT-10),
196 codepages << (PAGE_SHIFT-10),
197 datapages << (PAGE_SHIFT-10),
198 initpages << (PAGE_SHIFT-10));
199 print_memmap();
200 }
201
202 #ifdef CONFIG_BLK_DEV_INITRD
free_initrd_mem(unsigned long start,unsigned long end)203 void free_initrd_mem(unsigned long start, unsigned long end)
204 {
205 free_reserved_area(start, end, 0, "initrd");
206 }
207 #endif
208