[PATCH] m32r: Fix M32104 cache flushing routines
[linux-2.6.git] / 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                 unsigned long flags;
52                 pgdat_resize_lock(pgdat, &flags);
53                 for (i = 0; i < pgdat->node_spanned_pages; ++i) {
54                         page = pgdat_page_nr(pgdat, i);
55                         total++;
56                         if (PageHighMem(page))
57                                 highmem++;
58                         if (PageReserved(page))
59                                 reserved++;
60                         else if (PageSwapCache(page))
61                                 cached++;
62                         else if (page_count(page))
63                                 shared += page_count(page) - 1;
64                 }
65                 pgdat_resize_unlock(pgdat, &flags);
66         }
67         printk("%d pages of RAM\n", total);
68         printk("%d pages of HIGHMEM\n",highmem);
69         printk("%d reserved pages\n",reserved);
70         printk("%d pages shared\n",shared);
71         printk("%d pages swap cached\n",cached);
72 }
73
74 /*
75  * Cache of MMU context last used.
76  */
77 #ifndef CONFIG_SMP
78 unsigned long mmu_context_cache_dat;
79 #else
80 unsigned long mmu_context_cache_dat[NR_CPUS];
81 #endif
82 static unsigned long hole_pages;
83
84 /*
85  * function prototype
86  */
87 void __init paging_init(void);
88 void __init mem_init(void);
89 void free_initmem(void);
90 #ifdef CONFIG_BLK_DEV_INITRD
91 void free_initrd_mem(unsigned long, unsigned long);
92 #endif
93
94 /* It'd be good if these lines were in the standard header file. */
95 #define START_PFN(nid)  \
96         (NODE_DATA(nid)->bdata->node_boot_start >> PAGE_SHIFT)
97 #define MAX_LOW_PFN(nid)        (NODE_DATA(nid)->bdata->node_low_pfn)
98
99 #ifndef CONFIG_DISCONTIGMEM
100 unsigned long __init zone_sizes_init(void)
101 {
102         unsigned long  zones_size[MAX_NR_ZONES] = {0, 0, 0};
103         unsigned long  max_dma;
104         unsigned long  low;
105         unsigned long  start_pfn;
106
107 #ifdef CONFIG_MMU
108         start_pfn = START_PFN(0);
109         max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
110         low = MAX_LOW_PFN(0);
111
112         if (low < max_dma){
113                 zones_size[ZONE_DMA] = low - start_pfn;
114                 zones_size[ZONE_NORMAL] = 0;
115         } else {
116                 zones_size[ZONE_DMA] = low - start_pfn;
117                 zones_size[ZONE_NORMAL] = low - max_dma;
118         }
119 #else
120         zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
121         zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
122         start_pfn = __MEMORY_START >> PAGE_SHIFT;
123 #endif /* CONFIG_MMU */
124
125         free_area_init_node(0, NODE_DATA(0), zones_size, start_pfn, 0);
126
127         return 0;
128 }
129 #else   /* CONFIG_DISCONTIGMEM */
130 extern unsigned long zone_sizes_init(void);
131 #endif  /* CONFIG_DISCONTIGMEM */
132
133 /*======================================================================*
134  * paging_init() : sets up the page tables
135  *======================================================================*/
136 void __init paging_init(void)
137 {
138 #ifdef CONFIG_MMU
139         int  i;
140         pgd_t *pg_dir;
141
142         /* We don't need kernel mapping as hardware support that. */
143         pg_dir = swapper_pg_dir;
144
145         for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
146                 pgd_val(pg_dir[i]) = 0;
147 #endif /* CONFIG_MMU */
148         hole_pages = zone_sizes_init();
149 }
150
151 int __init reservedpages_count(void)
152 {
153         int reservedpages, nid, i;
154
155         reservedpages = 0;
156         for_each_online_node(nid) {
157                 unsigned long flags;
158                 pgdat_resize_lock(NODE_DATA(nid), &flags);
159                 for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
160                         if (PageReserved(nid_page_nr(nid, i)))
161                                 reservedpages++;
162                 pgdat_resize_unlock(NODE_DATA(nid), &flags);
163         }
164
165         return reservedpages;
166 }
167
168 /*======================================================================*
169  * mem_init() :
170  * orig : arch/sh/mm/init.c
171  *======================================================================*/
172 void __init mem_init(void)
173 {
174         int codesize, reservedpages, datasize, initsize;
175         int nid;
176 #ifndef CONFIG_MMU
177         extern unsigned long memory_end;
178 #endif
179
180         num_physpages = 0;
181         for_each_online_node(nid)
182                 num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
183
184         num_physpages -= hole_pages;
185
186 #ifndef CONFIG_DISCONTIGMEM
187         max_mapnr = num_physpages;
188 #endif  /* CONFIG_DISCONTIGMEM */
189
190 #ifdef CONFIG_MMU
191         high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
192 #else
193         high_memory = (void *)(memory_end & PAGE_MASK);
194 #endif /* CONFIG_MMU */
195
196         /* clear the zero-page */
197         memset(empty_zero_page, 0, PAGE_SIZE);
198
199         /* this will put all low memory onto the freelists */
200         for_each_online_node(nid)
201                 totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
202
203         reservedpages = reservedpages_count() - hole_pages;
204         codesize = (unsigned long) &_etext - (unsigned long)&_text;
205         datasize = (unsigned long) &_edata - (unsigned long)&_etext;
206         initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
207
208         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
209                 "%dk reserved, %dk data, %dk init)\n",
210                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
211                 num_physpages << (PAGE_SHIFT-10),
212                 codesize >> 10,
213                 reservedpages << (PAGE_SHIFT-10),
214                 datasize >> 10,
215                 initsize >> 10);
216 }
217
218 /*======================================================================*
219  * free_initmem() :
220  * orig : arch/sh/mm/init.c
221  *======================================================================*/
222 void free_initmem(void)
223 {
224         unsigned long addr;
225
226         addr = (unsigned long)(&__init_begin);
227         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
228                 ClearPageReserved(virt_to_page(addr));
229                 set_page_count(virt_to_page(addr), 1);
230                 free_page(addr);
231                 totalram_pages++;
232         }
233         printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
234           (int)(&__init_end - &__init_begin) >> 10);
235 }
236
237 #ifdef CONFIG_BLK_DEV_INITRD
238 /*======================================================================*
239  * free_initrd_mem() :
240  * orig : arch/sh/mm/init.c
241  *======================================================================*/
242 void free_initrd_mem(unsigned long start, unsigned long end)
243 {
244         unsigned long p;
245         for (p = start; p < end; p += PAGE_SIZE) {
246                 ClearPageReserved(virt_to_page(p));
247                 set_page_count(virt_to_page(p), 1);
248                 free_page(p);
249                 totalram_pages++;
250         }
251         printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
252 }
253 #endif
254