sh: replace remaining __FUNCTION__ occurrences
[linux-2.6.git] / 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 #ifdef CONFIG_SUPERH32
207         /* Set up the uncached fixmap */
208         set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
209
210 #ifdef CONFIG_29BIT
211         /*
212          * Handle trivial transitions between cached and uncached
213          * segments, making use of the 1:1 mapping relationship in
214          * 512MB lowmem.
215          */
216         cached_to_uncached = P2SEG - P1SEG;
217 #endif
218 #endif
219 }
220
221 static struct kcore_list kcore_mem, kcore_vmalloc;
222 int after_bootmem = 0;
223
224 void __init mem_init(void)
225 {
226         int codesize, datasize, initsize;
227         int nid;
228
229         num_physpages = 0;
230         high_memory = NULL;
231
232         for_each_online_node(nid) {
233                 pg_data_t *pgdat = NODE_DATA(nid);
234                 unsigned long node_pages = 0;
235                 void *node_high_memory;
236
237                 num_physpages += pgdat->node_present_pages;
238
239                 if (pgdat->node_spanned_pages)
240                         node_pages = free_all_bootmem_node(pgdat);
241
242                 totalram_pages += node_pages;
243
244                 node_high_memory = (void *)__va((pgdat->node_start_pfn +
245                                                  pgdat->node_spanned_pages) <<
246                                                  PAGE_SHIFT);
247                 if (node_high_memory > high_memory)
248                         high_memory = node_high_memory;
249         }
250
251         /* clear the zero-page */
252         memset(empty_zero_page, 0, PAGE_SIZE);
253         __flush_wback_region(empty_zero_page, PAGE_SIZE);
254
255         after_bootmem = 1;
256
257         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
258         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
259         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
260
261         kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
262         kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
263                    VMALLOC_END - VMALLOC_START);
264
265         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
266                "%dk data, %dk init)\n",
267                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
268                 num_physpages << (PAGE_SHIFT-10),
269                 codesize >> 10,
270                 datasize >> 10,
271                 initsize >> 10);
272
273         p3_cache_init();
274
275         /* Initialize the vDSO */
276         vsyscall_init();
277 }
278
279 void free_initmem(void)
280 {
281         unsigned long addr;
282
283         addr = (unsigned long)(&__init_begin);
284         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
285                 ClearPageReserved(virt_to_page(addr));
286                 init_page_count(virt_to_page(addr));
287                 free_page(addr);
288                 totalram_pages++;
289         }
290         printk("Freeing unused kernel memory: %ldk freed\n",
291                ((unsigned long)&__init_end -
292                 (unsigned long)&__init_begin) >> 10);
293 }
294
295 #ifdef CONFIG_BLK_DEV_INITRD
296 void free_initrd_mem(unsigned long start, unsigned long end)
297 {
298         unsigned long p;
299         for (p = start; p < end; p += PAGE_SIZE) {
300                 ClearPageReserved(virt_to_page(p));
301                 init_page_count(virt_to_page(p));
302                 free_page(p);
303                 totalram_pages++;
304         }
305         printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
306 }
307 #endif
308
309 #ifdef CONFIG_MEMORY_HOTPLUG
310 void online_page(struct page *page)
311 {
312         ClearPageReserved(page);
313         init_page_count(page);
314         __free_page(page);
315         totalram_pages++;
316         num_physpages++;
317 }
318
319 int arch_add_memory(int nid, u64 start, u64 size)
320 {
321         pg_data_t *pgdat;
322         unsigned long start_pfn = start >> PAGE_SHIFT;
323         unsigned long nr_pages = size >> PAGE_SHIFT;
324         int ret;
325
326         pgdat = NODE_DATA(nid);
327
328         /* We only have ZONE_NORMAL, so this is easy.. */
329         ret = __add_pages(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages);
330         if (unlikely(ret))
331                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
332
333         return ret;
334 }
335 EXPORT_SYMBOL_GPL(arch_add_memory);
336
337 #ifdef CONFIG_NUMA
338 int memory_add_physaddr_to_nid(u64 addr)
339 {
340         /* Node 0 for now.. */
341         return 0;
342 }
343 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
344 #endif
345 #endif