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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/m68k/mm/init.c
2 * linux/arch/m68k/mm/init.c
4 * Copyright (C) 1995 Hamish Macdonald
6 * Contains common initialization routines, specific init code moved
7 * to motorola.c and sun3mmu.c
10 #include <linux/module.h>
11 #include <linux/signal.h>
12 #include <linux/sched.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>
22 #include <asm/setup.h>
23 #include <asm/uaccess.h>
25 #include <asm/pgalloc.h>
26 #include <asm/traps.h>
27 #include <asm/machdep.h>
30 #include <asm/atari_stram.h>
32 #include <asm/sections.h>
36 * ZERO_PAGE is a special page that is used for zero-initialized
39 void *empty_zero_page
;
40 EXPORT_SYMBOL(empty_zero_page
);
42 #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
43 extern void init_pointer_table(unsigned long ptable
);
44 extern pmd_t
*zero_pgtable
;
49 pg_data_t pg_data_map
[MAX_NUMNODES
];
50 EXPORT_SYMBOL(pg_data_map
);
52 int m68k_virt_to_node_shift
;
54 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
55 pg_data_t
*pg_data_table
[65];
56 EXPORT_SYMBOL(pg_data_table
);
59 void __init
m68k_setup_node(int node
)
61 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
62 struct m68k_mem_info
*info
= m68k_memory
+ node
;
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
++) {
69 printk("overlap at %u for chunk %u\n", i
, node
);
70 pg_data_table
[i
] = pg_data_map
+ node
;
73 pg_data_map
[node
].bdata
= bootmem_node_data
+ node
;
74 node_set_online(node
);
77 #else /* CONFIG_MMU */
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.
85 void __init
paging_init(void)
88 * Make sure start_mem is page aligned, otherwise bootmem and
89 * page_alloc get different views of the world.
91 unsigned long end_mem
= memory_end
& PAGE_MASK
;
92 unsigned long zones_size
[MAX_NR_ZONES
] = { 0, };
94 high_memory
= (void *) end_mem
;
96 empty_zero_page
= alloc_bootmem_pages(PAGE_SIZE
);
99 * Set up SFC/DFC registers (user data space).
103 zones_size
[ZONE_DMA
] = (end_mem
- PAGE_OFFSET
) >> PAGE_SHIFT
;
104 free_area_init(zones_size
);
107 #endif /* CONFIG_MMU */
109 void free_initmem(void)
111 #ifndef CONFIG_MMU_SUN3
112 free_initmem_default(-1);
113 #endif /* CONFIG_MMU_SUN3 */
116 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
117 #define VECTORS &vectors[0]
119 #define VECTORS _ramvec
122 void __init
print_memmap(void)
124 #define UL(x) ((unsigned long) (x))
125 #define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
126 #define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
127 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
129 pr_notice("Virtual kernel memory layout:\n"
130 " vector : 0x%08lx - 0x%08lx (%4ld KiB)\n"
131 " kmap : 0x%08lx - 0x%08lx (%4ld MiB)\n"
132 " vmalloc : 0x%08lx - 0x%08lx (%4ld MiB)\n"
133 " lowmem : 0x%08lx - 0x%08lx (%4ld MiB)\n"
134 " .init : 0x%p" " - 0x%p" " (%4d KiB)\n"
135 " .text : 0x%p" " - 0x%p" " (%4d KiB)\n"
136 " .data : 0x%p" " - 0x%p" " (%4d KiB)\n"
137 " .bss : 0x%p" " - 0x%p" " (%4d KiB)\n",
138 MLK(VECTORS
, VECTORS
+ 256),
139 MLM(KMAP_START
, KMAP_END
),
140 MLM(VMALLOC_START
, VMALLOC_END
),
141 MLM(PAGE_OFFSET
, (unsigned long)high_memory
),
142 MLK_ROUNDUP(__init_begin
, __init_end
),
143 MLK_ROUNDUP(_stext
, _etext
),
144 MLK_ROUNDUP(_sdata
, _edata
),
145 MLK_ROUNDUP(__bss_start
, __bss_stop
));
148 static inline void init_pointer_tables(void)
150 #if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
153 /* insert pointer tables allocated so far into the tablelist */
154 init_pointer_table((unsigned long)kernel_pg_dir
);
155 for (i
= 0; i
< PTRS_PER_PGD
; i
++) {
156 if (pgd_present(kernel_pg_dir
[i
]))
157 init_pointer_table(__pgd_page(kernel_pg_dir
[i
]));
160 /* insert also pointer table that we used to unmap the zero page */
162 init_pointer_table((unsigned long)zero_pgtable
);
166 void __init
mem_init(void)
168 /* this will put all memory onto the freelists */
170 init_pointer_tables();
171 mem_init_print_info(NULL
);
175 #ifdef CONFIG_BLK_DEV_INITRD
176 void free_initrd_mem(unsigned long start
, unsigned long end
)
178 free_reserved_area((void *)start
, (void *)end
, -1, "initrd");