/home/lenb/src/to-linus branch 'acpi-2.6.12'
[linux-2.6] / arch / m32r / mm / init.c
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 <asm/types.h>
22 #include <asm/processor.h>
23 #include <asm/page.h>
24 #include <asm/pgtable.h>
25 #include <asm/pgalloc.h>
26 #include <asm/mmu_context.h>
27 #include <asm/setup.h>
28 #include <asm/tlb.h>
29
30 /* References to section boundaries */
31 extern char _text, _etext, _edata;
32 extern char __init_begin, __init_end;
33
34 pgd_t swapper_pg_dir[1024];
35
36 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
37
38 void show_mem(void)
39 {
40         int total = 0, reserved = 0;
41         int shared = 0, cached = 0;
42         int highmem = 0;
43         struct page *page;
44         pg_data_t *pgdat;
45         unsigned long i;
46
47         printk("Mem-info:\n");
48         show_free_areas();
49         printk("Free swap:       %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
50         for_each_pgdat(pgdat) {
51                 for (i = 0; i < pgdat->node_spanned_pages; ++i) {
52                         page = pgdat_page_nr(pgdat, i);
53                         total++;
54                         if (PageHighMem(page))
55                                 highmem++;
56                         if (PageReserved(page))
57                                 reserved++;
58                         else if (PageSwapCache(page))
59                                 cached++;
60                         else if (page_count(page))
61                                 shared += page_count(page) - 1;
62                 }
63         }
64         printk("%d pages of RAM\n", total);
65         printk("%d pages of HIGHMEM\n",highmem);
66         printk("%d reserved pages\n",reserved);
67         printk("%d pages shared\n",shared);
68         printk("%d pages swap cached\n",cached);
69 }
70
71 /*
72  * Cache of MMU context last used.
73  */
74 #ifndef CONFIG_SMP
75 unsigned long mmu_context_cache_dat;
76 #else
77 unsigned long mmu_context_cache_dat[NR_CPUS];
78 #endif
79 static unsigned long hole_pages;
80
81 /*
82  * function prototype
83  */
84 void __init paging_init(void);
85 void __init mem_init(void);
86 void free_initmem(void);
87 #ifdef CONFIG_BLK_DEV_INITRD
88 void free_initrd_mem(unsigned long, unsigned long);
89 #endif
90
91 /* It'd be good if these lines were in the standard header file. */
92 #define START_PFN(nid)  \
93         (NODE_DATA(nid)->bdata->node_boot_start >> PAGE_SHIFT)
94 #define MAX_LOW_PFN(nid)        (NODE_DATA(nid)->bdata->node_low_pfn)
95
96 #ifndef CONFIG_DISCONTIGMEM
97 unsigned long __init zone_sizes_init(void)
98 {
99         unsigned long  zones_size[MAX_NR_ZONES] = {0, 0, 0};
100         unsigned long  max_dma;
101         unsigned long  low;
102         unsigned long  start_pfn;
103
104 #ifdef CONFIG_MMU
105         start_pfn = START_PFN(0);
106         max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
107         low = MAX_LOW_PFN(0);
108
109         if (low < max_dma){
110                 zones_size[ZONE_DMA] = low - start_pfn;
111                 zones_size[ZONE_NORMAL] = 0;
112         } else {
113                 zones_size[ZONE_DMA] = low - start_pfn;
114                 zones_size[ZONE_NORMAL] = low - max_dma;
115         }
116 #else
117         zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
118         zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
119         start_pfn = __MEMORY_START >> PAGE_SHIFT;
120 #endif /* CONFIG_MMU */
121
122         free_area_init_node(0, NODE_DATA(0), zones_size, start_pfn, 0);
123
124         return 0;
125 }
126 #else   /* CONFIG_DISCONTIGMEM */
127 extern unsigned long zone_sizes_init(void);
128 #endif  /* CONFIG_DISCONTIGMEM */
129
130 /*======================================================================*
131  * paging_init() : sets up the page tables
132  *======================================================================*/
133 void __init paging_init(void)
134 {
135 #ifdef CONFIG_MMU
136         int  i;
137         pgd_t *pg_dir;
138
139         /* We don't need kernel mapping as hardware support that. */
140         pg_dir = swapper_pg_dir;
141
142         for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
143                 pgd_val(pg_dir[i]) = 0;
144 #endif /* CONFIG_MMU */
145         hole_pages = zone_sizes_init();
146 }
147
148 int __init reservedpages_count(void)
149 {
150         int reservedpages, nid, i;
151
152         reservedpages = 0;
153         for_each_online_node(nid)
154                 for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
155                         if (PageReserved(nid_page_nr(nid, i)))
156                                 reservedpages++;
157
158         return reservedpages;
159 }
160
161 /*======================================================================*
162  * mem_init() :
163  * orig : arch/sh/mm/init.c
164  *======================================================================*/
165 void __init mem_init(void)
166 {
167         int codesize, reservedpages, datasize, initsize;
168         int nid;
169 #ifndef CONFIG_MMU
170         extern unsigned long memory_end;
171 #endif
172
173         num_physpages = 0;
174         for_each_online_node(nid)
175                 num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
176
177         num_physpages -= hole_pages;
178
179 #ifndef CONFIG_DISCONTIGMEM
180         max_mapnr = num_physpages;
181 #endif  /* CONFIG_DISCONTIGMEM */
182
183 #ifdef CONFIG_MMU
184         high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
185 #else
186         high_memory = (void *)(memory_end & PAGE_MASK);
187 #endif /* CONFIG_MMU */
188
189         /* clear the zero-page */
190         memset(empty_zero_page, 0, PAGE_SIZE);
191
192         /* this will put all low memory onto the freelists */
193         for_each_online_node(nid)
194                 totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
195
196         reservedpages = reservedpages_count() - hole_pages;
197         codesize = (unsigned long) &_etext - (unsigned long)&_text;
198         datasize = (unsigned long) &_edata - (unsigned long)&_etext;
199         initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
200
201         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
202                 "%dk reserved, %dk data, %dk init)\n",
203                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
204                 num_physpages << (PAGE_SHIFT-10),
205                 codesize >> 10,
206                 reservedpages << (PAGE_SHIFT-10),
207                 datasize >> 10,
208                 initsize >> 10);
209 }
210
211 /*======================================================================*
212  * free_initmem() :
213  * orig : arch/sh/mm/init.c
214  *======================================================================*/
215 void free_initmem(void)
216 {
217         unsigned long addr;
218
219         addr = (unsigned long)(&__init_begin);
220         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
221                 ClearPageReserved(virt_to_page(addr));
222                 set_page_count(virt_to_page(addr), 1);
223                 free_page(addr);
224                 totalram_pages++;
225         }
226         printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
227           (int)(&__init_end - &__init_begin) >> 10);
228 }
229
230 #ifdef CONFIG_BLK_DEV_INITRD
231 /*======================================================================*
232  * free_initrd_mem() :
233  * orig : arch/sh/mm/init.c
234  *======================================================================*/
235 void free_initrd_mem(unsigned long start, unsigned long end)
236 {
237         unsigned long p;
238         for (p = start; p < end; p += PAGE_SIZE) {
239                 ClearPageReserved(virt_to_page(p));
240                 set_page_count(virt_to_page(p), 1);
241                 free_page(p);
242                 totalram_pages++;
243         }
244         printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
245 }
246 #endif
247