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 <asm/types.h>
23 #include <asm/processor.h>
24 #include <asm/page.h>
25 #include <asm/pgtable.h>
26 #include <asm/pgalloc.h>
27 #include <asm/mmu_context.h>
28 #include <asm/setup.h>
29 #include <asm/tlb.h>
30
31 /* References to section boundaries */
32 extern char _text, _etext, _edata;
33 extern char __init_begin, __init_end;
34
35 pgd_t swapper_pg_dir[1024];
36
37 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
38
39 /*
40 * Cache of MMU context last used.
41 */
42 #ifndef CONFIG_SMP
43 unsigned long mmu_context_cache_dat;
44 #else
45 unsigned long mmu_context_cache_dat[NR_CPUS];
46 #endif
47 static unsigned long hole_pages;
48
49 /*
50 * function prototype
51 */
52 void __init paging_init(void);
53 void __init mem_init(void);
54 void free_initmem(void);
55 #ifdef CONFIG_BLK_DEV_INITRD
56 void free_initrd_mem(unsigned long, unsigned long);
57 #endif
58
59 /* It'd be good if these lines were in the standard header file. */
60 #define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn)
61 #define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
62
63 #ifndef CONFIG_DISCONTIGMEM
zone_sizes_init(void)64 unsigned long __init zone_sizes_init(void)
65 {
66 unsigned long zones_size[MAX_NR_ZONES] = {0, };
67 unsigned long max_dma;
68 unsigned long low;
69 unsigned long start_pfn;
70
71 #ifdef CONFIG_MMU
72 start_pfn = START_PFN(0);
73 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
74 low = MAX_LOW_PFN(0);
75
76 if (low < max_dma){
77 zones_size[ZONE_DMA] = low - start_pfn;
78 zones_size[ZONE_NORMAL] = 0;
79 } else {
80 zones_size[ZONE_DMA] = low - start_pfn;
81 zones_size[ZONE_NORMAL] = low - max_dma;
82 }
83 #else
84 zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
85 zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
86 start_pfn = __MEMORY_START >> PAGE_SHIFT;
87 #endif /* CONFIG_MMU */
88
89 free_area_init_node(0, zones_size, start_pfn, 0);
90
91 return 0;
92 }
93 #else /* CONFIG_DISCONTIGMEM */
94 extern unsigned long zone_sizes_init(void);
95 #endif /* CONFIG_DISCONTIGMEM */
96
97 /*======================================================================*
98 * paging_init() : sets up the page tables
99 *======================================================================*/
paging_init(void)100 void __init paging_init(void)
101 {
102 #ifdef CONFIG_MMU
103 int i;
104 pgd_t *pg_dir;
105
106 /* We don't need kernel mapping as hardware support that. */
107 pg_dir = swapper_pg_dir;
108
109 for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
110 pgd_val(pg_dir[i]) = 0;
111 #endif /* CONFIG_MMU */
112 hole_pages = zone_sizes_init();
113 }
114
reservedpages_count(void)115 int __init reservedpages_count(void)
116 {
117 int reservedpages, nid, i;
118
119 reservedpages = 0;
120 for_each_online_node(nid) {
121 unsigned long flags;
122 pgdat_resize_lock(NODE_DATA(nid), &flags);
123 for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
124 if (PageReserved(nid_page_nr(nid, i)))
125 reservedpages++;
126 pgdat_resize_unlock(NODE_DATA(nid), &flags);
127 }
128
129 return reservedpages;
130 }
131
132 /*======================================================================*
133 * mem_init() :
134 * orig : arch/sh/mm/init.c
135 *======================================================================*/
mem_init(void)136 void __init mem_init(void)
137 {
138 int codesize, reservedpages, datasize, initsize;
139 int nid;
140 #ifndef CONFIG_MMU
141 extern unsigned long memory_end;
142 #endif
143
144 num_physpages = 0;
145 for_each_online_node(nid)
146 num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
147
148 num_physpages -= hole_pages;
149
150 #ifndef CONFIG_DISCONTIGMEM
151 max_mapnr = num_physpages;
152 #endif /* CONFIG_DISCONTIGMEM */
153
154 #ifdef CONFIG_MMU
155 high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
156 #else
157 high_memory = (void *)(memory_end & PAGE_MASK);
158 #endif /* CONFIG_MMU */
159
160 /* clear the zero-page */
161 memset(empty_zero_page, 0, PAGE_SIZE);
162
163 /* this will put all low memory onto the freelists */
164 for_each_online_node(nid)
165 totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
166
167 reservedpages = reservedpages_count() - hole_pages;
168 codesize = (unsigned long) &_etext - (unsigned long)&_text;
169 datasize = (unsigned long) &_edata - (unsigned long)&_etext;
170 initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
171
172 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
173 "%dk reserved, %dk data, %dk init)\n",
174 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
175 num_physpages << (PAGE_SHIFT-10),
176 codesize >> 10,
177 reservedpages << (PAGE_SHIFT-10),
178 datasize >> 10,
179 initsize >> 10);
180 }
181
182 /*======================================================================*
183 * free_initmem() :
184 * orig : arch/sh/mm/init.c
185 *======================================================================*/
free_initmem(void)186 void free_initmem(void)
187 {
188 unsigned long addr;
189
190 addr = (unsigned long)(&__init_begin);
191 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
192 ClearPageReserved(virt_to_page(addr));
193 init_page_count(virt_to_page(addr));
194 free_page(addr);
195 totalram_pages++;
196 }
197 printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
198 (int)(&__init_end - &__init_begin) >> 10);
199 }
200
201 #ifdef CONFIG_BLK_DEV_INITRD
202 /*======================================================================*
203 * free_initrd_mem() :
204 * orig : arch/sh/mm/init.c
205 *======================================================================*/
free_initrd_mem(unsigned long start,unsigned long end)206 void free_initrd_mem(unsigned long start, unsigned long end)
207 {
208 unsigned long p;
209 for (p = start; p < end; p += PAGE_SIZE) {
210 ClearPageReserved(virt_to_page(p));
211 init_page_count(virt_to_page(p));
212 free_page(p);
213 totalram_pages++;
214 }
215 printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
216 }
217 #endif
218