1 /*
2 * linux/arch/m32r/mm/init.c
3 *
4 * Copyright (c) 2001, 2002 Hitoshi Yamamoto
5 *
6 * Some code taken from sh version.
7 * Copyright (C) 1999 Niibe Yutaka
8 * Based on linux/arch/i386/mm/init.c:
9 * Copyright (C) 1995 Linus Torvalds
10 */
11
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/mm.h>
15 #include <linux/pagemap.h>
16 #include <linux/bootmem.h>
17 #include <linux/swap.h>
18 #include <linux/highmem.h>
19 #include <linux/bitops.h>
20 #include <linux/nodemask.h>
21 #include <linux/pfn.h>
22 #include <linux/gfp.h>
23 #include <asm/types.h>
24 #include <asm/processor.h>
25 #include <asm/page.h>
26 #include <asm/pgtable.h>
27 #include <asm/pgalloc.h>
28 #include <asm/mmu_context.h>
29 #include <asm/setup.h>
30 #include <asm/tlb.h>
31 #include <asm/sections.h>
32
33 pgd_t swapper_pg_dir[1024];
34
35 /*
36 * Cache of MMU context last used.
37 */
38 #ifndef CONFIG_SMP
39 unsigned long mmu_context_cache_dat;
40 #else
41 unsigned long mmu_context_cache_dat[NR_CPUS];
42 #endif
43
44 /*
45 * function prototype
46 */
47 void __init paging_init(void);
48 void __init mem_init(void);
49 void free_initmem(void);
50 #ifdef CONFIG_BLK_DEV_INITRD
51 void free_initrd_mem(unsigned long, unsigned long);
52 #endif
53
54 /* It'd be good if these lines were in the standard header file. */
55 #define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn)
56 #define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
57
58 #ifndef CONFIG_DISCONTIGMEM
zone_sizes_init(void)59 void __init zone_sizes_init(void)
60 {
61 unsigned long zones_size[MAX_NR_ZONES] = {0, };
62 unsigned long max_dma;
63 unsigned long low;
64 unsigned long start_pfn;
65
66 #ifdef CONFIG_MMU
67 start_pfn = START_PFN(0);
68 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
69 low = MAX_LOW_PFN(0);
70
71 if (low < max_dma){
72 zones_size[ZONE_DMA] = low - start_pfn;
73 zones_size[ZONE_NORMAL] = 0;
74 } else {
75 zones_size[ZONE_DMA] = low - start_pfn;
76 zones_size[ZONE_NORMAL] = low - max_dma;
77 }
78 #else
79 zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
80 zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
81 start_pfn = __MEMORY_START >> PAGE_SHIFT;
82 #endif /* CONFIG_MMU */
83
84 free_area_init_node(0, zones_size, start_pfn, 0);
85 }
86 #else /* CONFIG_DISCONTIGMEM */
87 extern void zone_sizes_init(void);
88 #endif /* CONFIG_DISCONTIGMEM */
89
90 /*======================================================================*
91 * paging_init() : sets up the page tables
92 *======================================================================*/
paging_init(void)93 void __init paging_init(void)
94 {
95 #ifdef CONFIG_MMU
96 int i;
97 pgd_t *pg_dir;
98
99 /* We don't need kernel mapping as hardware support that. */
100 pg_dir = swapper_pg_dir;
101
102 for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
103 pgd_val(pg_dir[i]) = 0;
104 #endif /* CONFIG_MMU */
105 zone_sizes_init();
106 }
107
108 /*======================================================================*
109 * mem_init() :
110 * orig : arch/sh/mm/init.c
111 *======================================================================*/
mem_init(void)112 void __init mem_init(void)
113 {
114 #ifndef CONFIG_MMU
115 extern unsigned long memory_end;
116
117 high_memory = (void *)(memory_end & PAGE_MASK);
118 #else
119 high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
120 #endif /* CONFIG_MMU */
121
122 /* clear the zero-page */
123 memset(empty_zero_page, 0, PAGE_SIZE);
124
125 set_max_mapnr(get_num_physpages());
126 free_all_bootmem();
127 mem_init_print_info(NULL);
128 }
129
130 /*======================================================================*
131 * free_initmem() :
132 * orig : arch/sh/mm/init.c
133 *======================================================================*/
free_initmem(void)134 void free_initmem(void)
135 {
136 free_initmem_default(-1);
137 }
138
139 #ifdef CONFIG_BLK_DEV_INITRD
140 /*======================================================================*
141 * free_initrd_mem() :
142 * orig : arch/sh/mm/init.c
143 *======================================================================*/
free_initrd_mem(unsigned long start,unsigned long end)144 void free_initrd_mem(unsigned long start, unsigned long end)
145 {
146 free_reserved_area((void *)start, (void *)end, -1, "initrd");
147 }
148 #endif
149