Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...
[linux-2.6] / arch / sh / mm / init.c
1 /*
2  * linux/arch/sh/mm/init.c
3  *
4  *  Copyright (C) 1999  Niibe Yutaka
5  *  Copyright (C) 2002 - 2007  Paul Mundt
6  *
7  *  Based on linux/arch/i386/mm/init.c:
8  *   Copyright (C) 1995  Linus Torvalds
9  */
10 #include <linux/mm.h>
11 #include <linux/swap.h>
12 #include <linux/init.h>
13 #include <linux/bootmem.h>
14 #include <linux/proc_fs.h>
15 #include <linux/pagemap.h>
16 #include <linux/percpu.h>
17 #include <linux/io.h>
18 #include <asm/mmu_context.h>
19 #include <asm/tlb.h>
20 #include <asm/cacheflush.h>
21 #include <asm/sections.h>
22 #include <asm/cache.h>
23
24 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
25 pgd_t swapper_pg_dir[PTRS_PER_PGD];
26 unsigned long cached_to_uncached = 0;
27
28 void show_mem(void)
29 {
30         int total = 0, reserved = 0, free = 0;
31         int shared = 0, cached = 0, slab = 0;
32         pg_data_t *pgdat;
33
34         printk("Mem-info:\n");
35         show_free_areas();
36
37         for_each_online_pgdat(pgdat) {
38                 unsigned long flags, i;
39
40                 pgdat_resize_lock(pgdat, &flags);
41                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
42                         struct page *page = pgdat_page_nr(pgdat, i);
43                         total++;
44                         if (PageReserved(page))
45                                 reserved++;
46                         else if (PageSwapCache(page))
47                                 cached++;
48                         else if (PageSlab(page))
49                                 slab++;
50                         else if (!page_count(page))
51                                 free++;
52                         else
53                                 shared += page_count(page) - 1;
54                 }
55                 pgdat_resize_unlock(pgdat, &flags);
56         }
57
58         printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
59         printk("%d pages of RAM\n", total);
60         printk("%d free pages\n", free);
61         printk("%d reserved pages\n", reserved);
62         printk("%d slab pages\n", slab);
63         printk("%d pages shared\n", shared);
64         printk("%d pages swap cached\n", cached);
65         printk(KERN_INFO "Total of %ld pages in page table cache\n",
66                quicklist_total_size());
67 }
68
69 #ifdef CONFIG_MMU
70 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
71 {
72         pgd_t *pgd;
73         pud_t *pud;
74         pmd_t *pmd;
75         pte_t *pte;
76
77         pgd = pgd_offset_k(addr);
78         if (pgd_none(*pgd)) {
79                 pgd_ERROR(*pgd);
80                 return;
81         }
82
83         pud = pud_alloc(NULL, pgd, addr);
84         if (unlikely(!pud)) {
85                 pud_ERROR(*pud);
86                 return;
87         }
88
89         pmd = pmd_alloc(NULL, pud, addr);
90         if (unlikely(!pmd)) {
91                 pmd_ERROR(*pmd);
92                 return;
93         }
94
95         pte = pte_offset_kernel(pmd, addr);
96         if (!pte_none(*pte)) {
97                 pte_ERROR(*pte);
98                 return;
99         }
100
101         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
102
103         if (cached_to_uncached)
104                 flush_tlb_one(get_asid(), addr);
105 }
106
107 /*
108  * As a performance optimization, other platforms preserve the fixmap mapping
109  * across a context switch, we don't presently do this, but this could be done
110  * in a similar fashion as to the wired TLB interface that sh64 uses (by way
111  * of the memory mapped UTLB configuration) -- this unfortunately forces us to
112  * give up a TLB entry for each mapping we want to preserve. While this may be
113  * viable for a small number of fixmaps, it's not particularly useful for
114  * everything and needs to be carefully evaluated. (ie, we may want this for
115  * the vsyscall page).
116  *
117  * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
118  * in at __set_fixmap() time to determine the appropriate behavior to follow.
119  *
120  *                                       -- PFM.
121  */
122 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
123 {
124         unsigned long address = __fix_to_virt(idx);
125
126         if (idx >= __end_of_fixed_addresses) {
127                 BUG();
128                 return;
129         }
130
131         set_pte_phys(address, phys, prot);
132 }
133
134 void __init page_table_range_init(unsigned long start, unsigned long end,
135                                          pgd_t *pgd_base)
136 {
137         pgd_t *pgd;
138         pud_t *pud;
139         pmd_t *pmd;
140         int pgd_idx;
141         unsigned long vaddr;
142
143         vaddr = start & PMD_MASK;
144         end = (end + PMD_SIZE - 1) & PMD_MASK;
145         pgd_idx = pgd_index(vaddr);
146         pgd = pgd_base + pgd_idx;
147
148         for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
149                 BUG_ON(pgd_none(*pgd));
150                 pud = pud_offset(pgd, 0);
151                 BUG_ON(pud_none(*pud));
152                 pmd = pmd_offset(pud, 0);
153
154                 if (!pmd_present(*pmd)) {
155                         pte_t *pte_table;
156                         pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
157                         memset(pte_table, 0, PAGE_SIZE);
158                         pmd_populate_kernel(&init_mm, pmd, pte_table);
159                 }
160
161                 vaddr += PMD_SIZE;
162         }
163 }
164 #endif  /* CONFIG_MMU */
165
166 /*
167  * paging_init() sets up the page tables
168  */
169 void __init paging_init(void)
170 {
171         unsigned long max_zone_pfns[MAX_NR_ZONES];
172         int nid;
173
174         /* We don't need to map the kernel through the TLB, as
175          * it is permanatly mapped using P1. So clear the
176          * entire pgd. */
177         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
178
179         /* Set an initial value for the MMU.TTB so we don't have to
180          * check for a null value. */
181         set_TTB(swapper_pg_dir);
182
183         /* Populate the relevant portions of swapper_pg_dir so that
184          * we can use the fixmap entries without calling kmalloc.
185          * pte's will be filled in by __set_fixmap(). */
186         page_table_range_init(FIXADDR_START, FIXADDR_TOP, swapper_pg_dir);
187
188         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
189
190         for_each_online_node(nid) {
191                 pg_data_t *pgdat = NODE_DATA(nid);
192                 unsigned long low, start_pfn;
193
194                 start_pfn = pgdat->bdata->node_boot_start >> PAGE_SHIFT;
195                 low = pgdat->bdata->node_low_pfn;
196
197                 if (max_zone_pfns[ZONE_NORMAL] < low)
198                         max_zone_pfns[ZONE_NORMAL] = low;
199
200                 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
201                        nid, start_pfn, low);
202         }
203
204         free_area_init_nodes(max_zone_pfns);
205
206         /* Set up the uncached fixmap */
207         set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
208
209 #ifdef CONFIG_29BIT
210         /*
211          * Handle trivial transitions between cached and uncached
212          * segments, making use of the 1:1 mapping relationship in
213          * 512MB lowmem.
214          */
215         cached_to_uncached = P2SEG - P1SEG;
216 #endif
217 }
218
219 static struct kcore_list kcore_mem, kcore_vmalloc;
220 int after_bootmem = 0;
221
222 void __init mem_init(void)
223 {
224         int codesize, datasize, initsize;
225         int nid;
226
227         num_physpages = 0;
228         high_memory = NULL;
229
230         for_each_online_node(nid) {
231                 pg_data_t *pgdat = NODE_DATA(nid);
232                 unsigned long node_pages = 0;
233                 void *node_high_memory;
234
235                 num_physpages += pgdat->node_present_pages;
236
237                 if (pgdat->node_spanned_pages)
238                         node_pages = free_all_bootmem_node(pgdat);
239
240                 totalram_pages += node_pages;
241
242                 node_high_memory = (void *)__va((pgdat->node_start_pfn +
243                                                  pgdat->node_spanned_pages) <<
244                                                  PAGE_SHIFT);
245                 if (node_high_memory > high_memory)
246                         high_memory = node_high_memory;
247         }
248
249         /* clear the zero-page */
250         memset(empty_zero_page, 0, PAGE_SIZE);
251         __flush_wback_region(empty_zero_page, PAGE_SIZE);
252
253         after_bootmem = 1;
254
255         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
256         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
257         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
258
259         kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
260         kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
261                    VMALLOC_END - VMALLOC_START);
262
263         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
264                "%dk data, %dk init)\n",
265                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
266                 num_physpages << (PAGE_SHIFT-10),
267                 codesize >> 10,
268                 datasize >> 10,
269                 initsize >> 10);
270
271         p3_cache_init();
272
273         /* Initialize the vDSO */
274         vsyscall_init();
275 }
276
277 void free_initmem(void)
278 {
279         unsigned long addr;
280
281         addr = (unsigned long)(&__init_begin);
282         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
283                 ClearPageReserved(virt_to_page(addr));
284                 init_page_count(virt_to_page(addr));
285                 free_page(addr);
286                 totalram_pages++;
287         }
288         printk("Freeing unused kernel memory: %ldk freed\n",
289                ((unsigned long)&__init_end -
290                 (unsigned long)&__init_begin) >> 10);
291 }
292
293 #ifdef CONFIG_BLK_DEV_INITRD
294 void free_initrd_mem(unsigned long start, unsigned long end)
295 {
296         unsigned long p;
297         for (p = start; p < end; p += PAGE_SIZE) {
298                 ClearPageReserved(virt_to_page(p));
299                 init_page_count(virt_to_page(p));
300                 free_page(p);
301                 totalram_pages++;
302         }
303         printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
304 }
305 #endif
306
307 #ifdef CONFIG_MEMORY_HOTPLUG
308 void online_page(struct page *page)
309 {
310         ClearPageReserved(page);
311         init_page_count(page);
312         __free_page(page);
313         totalram_pages++;
314         num_physpages++;
315 }
316
317 int arch_add_memory(int nid, u64 start, u64 size)
318 {
319         pg_data_t *pgdat;
320         unsigned long start_pfn = start >> PAGE_SHIFT;
321         unsigned long nr_pages = size >> PAGE_SHIFT;
322         int ret;
323
324         pgdat = NODE_DATA(nid);
325
326         /* We only have ZONE_NORMAL, so this is easy.. */
327         ret = __add_pages(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages);
328         if (unlikely(ret))
329                 printk("%s: Failed, __add_pages() == %d\n", __FUNCTION__, ret);
330
331         return ret;
332 }
333 EXPORT_SYMBOL_GPL(arch_add_memory);
334
335 #ifdef CONFIG_NUMA
336 int memory_add_physaddr_to_nid(u64 addr)
337 {
338         /* Node 0 for now.. */
339         return 0;
340 }
341 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
342 #endif
343 #endif