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Paul Mundt01066622007-03-28 16:38:13 +09001/*
2 * linux/arch/sh/mm/init.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) 1999 Niibe Yutaka
Paul Mundt01066622007-03-28 16:38:13 +09005 * Copyright (C) 2002 - 2007 Paul Mundt
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * Based on linux/arch/i386/mm/init.c:
8 * Copyright (C) 1995 Linus Torvalds
9 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/mm.h>
11#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/bootmem.h>
Paul Mundt2cb7ce32006-09-27 18:20:58 +090014#include <linux/proc_fs.h>
Paul Mundt27641de2007-05-14 10:48:01 +090015#include <linux/pagemap.h>
Paul Mundt01066622007-03-28 16:38:13 +090016#include <linux/percpu.h>
17#include <linux/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <asm/mmu_context.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/tlb.h>
20#include <asm/cacheflush.h>
Paul Mundt07cbb412007-06-06 12:23:06 +090021#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <asm/cache.h>
23
24DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
25pgd_t swapper_pg_dir[PTRS_PER_PGD];
Stuart Menefyc6feb612008-09-05 16:06:42 +090026
27#ifdef CONFIG_SUPERH32
28/*
29 * Handle trivial transitions between cached and uncached
30 * segments, making use of the 1:1 mapping relationship in
31 * 512MB lowmem.
32 *
33 * This is the offset of the uncached section from its cached alias.
34 * Default value only valid in 29 bit mode, in 32bit mode will be
35 * overridden in pmb_init.
36 */
37unsigned long cached_to_uncached = P2SEG - P1SEG;
38#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Yoshinori Sato11cbb702006-12-07 18:07:27 +090040#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -070041static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
42{
43 pgd_t *pgd;
Paul Mundt26ff6c12006-09-27 15:13:36 +090044 pud_t *pud;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 pmd_t *pmd;
46 pte_t *pte;
47
Stuart Menefy99a596f2006-11-21 15:38:05 +090048 pgd = pgd_offset_k(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 if (pgd_none(*pgd)) {
50 pgd_ERROR(*pgd);
51 return;
52 }
53
Stuart Menefy99a596f2006-11-21 15:38:05 +090054 pud = pud_alloc(NULL, pgd, addr);
55 if (unlikely(!pud)) {
56 pud_ERROR(*pud);
57 return;
Paul Mundt26ff6c12006-09-27 15:13:36 +090058 }
59
Stuart Menefy99a596f2006-11-21 15:38:05 +090060 pmd = pmd_alloc(NULL, pud, addr);
61 if (unlikely(!pmd)) {
62 pmd_ERROR(*pmd);
63 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 }
65
66 pte = pte_offset_kernel(pmd, addr);
67 if (!pte_none(*pte)) {
68 pte_ERROR(*pte);
69 return;
70 }
71
72 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
Paul Mundt997d0032009-06-19 15:37:11 +090073 local_flush_tlb_one(get_asid(), addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074}
75
76/*
77 * As a performance optimization, other platforms preserve the fixmap mapping
78 * across a context switch, we don't presently do this, but this could be done
79 * in a similar fashion as to the wired TLB interface that sh64 uses (by way
Simon Arlotte868d612007-05-14 08:15:10 +090080 * of the memory mapped UTLB configuration) -- this unfortunately forces us to
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 * give up a TLB entry for each mapping we want to preserve. While this may be
82 * viable for a small number of fixmaps, it's not particularly useful for
83 * everything and needs to be carefully evaluated. (ie, we may want this for
84 * the vsyscall page).
85 *
86 * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
87 * in at __set_fixmap() time to determine the appropriate behavior to follow.
88 *
89 * -- PFM.
90 */
91void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
92{
93 unsigned long address = __fix_to_virt(idx);
94
95 if (idx >= __end_of_fixed_addresses) {
96 BUG();
97 return;
98 }
99
100 set_pte_phys(address, phys, prot);
101}
Stuart Menefy2adb4e12007-11-30 17:59:55 +0900102
103void __init page_table_range_init(unsigned long start, unsigned long end,
104 pgd_t *pgd_base)
105{
106 pgd_t *pgd;
107 pud_t *pud;
108 pmd_t *pmd;
Paul Mundt0906a3a2009-09-03 17:21:10 +0900109 pte_t *pte;
110 int i, j, k;
Stuart Menefy2adb4e12007-11-30 17:59:55 +0900111 unsigned long vaddr;
112
Paul Mundt0906a3a2009-09-03 17:21:10 +0900113 vaddr = start;
114 i = __pgd_offset(vaddr);
115 j = __pud_offset(vaddr);
116 k = __pmd_offset(vaddr);
117 pgd = pgd_base + i;
Stuart Menefy2adb4e12007-11-30 17:59:55 +0900118
Paul Mundt0906a3a2009-09-03 17:21:10 +0900119 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
120 pud = (pud_t *)pgd;
121 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
122 pmd = (pmd_t *)pud;
123 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
124 if (pmd_none(*pmd)) {
125 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
126 pmd_populate_kernel(&init_mm, pmd, pte);
127 BUG_ON(pte != pte_offset_kernel(pmd, 0));
128 }
129 vaddr += PMD_SIZE;
130 }
131 k = 0;
Stuart Menefy2adb4e12007-11-30 17:59:55 +0900132 }
Paul Mundt0906a3a2009-09-03 17:21:10 +0900133 j = 0;
Stuart Menefy2adb4e12007-11-30 17:59:55 +0900134 }
135}
Yoshinori Sato11cbb702006-12-07 18:07:27 +0900136#endif /* CONFIG_MMU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138/*
139 * paging_init() sets up the page tables
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 */
141void __init paging_init(void)
142{
Paul Mundt2de212e2007-06-06 12:09:54 +0900143 unsigned long max_zone_pfns[MAX_NR_ZONES];
Paul Mundt0906a3a2009-09-03 17:21:10 +0900144 unsigned long vaddr, end;
Paul Mundt01066622007-03-28 16:38:13 +0900145 int nid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Paul Mundt01066622007-03-28 16:38:13 +0900147 /* We don't need to map the kernel through the TLB, as
148 * it is permanatly mapped using P1. So clear the
149 * entire pgd. */
150 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Stuart Menefy6e4662f2006-11-21 13:53:44 +0900152 /* Set an initial value for the MMU.TTB so we don't have to
153 * check for a null value. */
154 set_TTB(swapper_pg_dir);
155
Paul Mundtacca4f42008-11-10 20:00:45 +0900156 /*
157 * Populate the relevant portions of swapper_pg_dir so that
Stuart Menefy2adb4e12007-11-30 17:59:55 +0900158 * we can use the fixmap entries without calling kmalloc.
Paul Mundtacca4f42008-11-10 20:00:45 +0900159 * pte's will be filled in by __set_fixmap().
160 */
161 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
Paul Mundt0906a3a2009-09-03 17:21:10 +0900162 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
163 page_table_range_init(vaddr, end, swapper_pg_dir);
Paul Mundtacca4f42008-11-10 20:00:45 +0900164
165 kmap_coherent_init();
Stuart Menefy2adb4e12007-11-30 17:59:55 +0900166
Paul Mundt2de212e2007-06-06 12:09:54 +0900167 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
168
Paul Mundt01066622007-03-28 16:38:13 +0900169 for_each_online_node(nid) {
170 pg_data_t *pgdat = NODE_DATA(nid);
Paul Mundt01066622007-03-28 16:38:13 +0900171 unsigned long low, start_pfn;
172
Johannes Weiner3560e242008-07-23 21:28:09 -0700173 start_pfn = pgdat->bdata->node_min_pfn;
Paul Mundt01066622007-03-28 16:38:13 +0900174 low = pgdat->bdata->node_low_pfn;
175
Paul Mundt2de212e2007-06-06 12:09:54 +0900176 if (max_zone_pfns[ZONE_NORMAL] < low)
177 max_zone_pfns[ZONE_NORMAL] = low;
Paul Mundt01066622007-03-28 16:38:13 +0900178
179 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
180 nid, start_pfn, low);
Paul Mundt01066622007-03-28 16:38:13 +0900181 }
Paul Mundt2de212e2007-06-06 12:09:54 +0900182
183 free_area_init_nodes(max_zone_pfns);
Stuart Menefycbaa1182007-11-30 17:06:36 +0900184
185 /* Set up the uncached fixmap */
186 set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
188
189void __init mem_init(void)
190{
Paul Mundtdfbb9042007-05-23 17:48:36 +0900191 int codesize, datasize, initsize;
Paul Mundt01066622007-03-28 16:38:13 +0900192 int nid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Paul Mundt2de212e2007-06-06 12:09:54 +0900194 num_physpages = 0;
195 high_memory = NULL;
196
Paul Mundt01066622007-03-28 16:38:13 +0900197 for_each_online_node(nid) {
198 pg_data_t *pgdat = NODE_DATA(nid);
199 unsigned long node_pages = 0;
200 void *node_high_memory;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Paul Mundt01066622007-03-28 16:38:13 +0900202 num_physpages += pgdat->node_present_pages;
203
204 if (pgdat->node_spanned_pages)
205 node_pages = free_all_bootmem_node(pgdat);
206
207 totalram_pages += node_pages;
208
Paul Mundt2de212e2007-06-06 12:09:54 +0900209 node_high_memory = (void *)__va((pgdat->node_start_pfn +
210 pgdat->node_spanned_pages) <<
211 PAGE_SHIFT);
Paul Mundt01066622007-03-28 16:38:13 +0900212 if (node_high_memory > high_memory)
213 high_memory = node_high_memory;
214 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Paul Mundt37443ef2009-08-15 12:29:49 +0900216 /* Set this up early, so we can take care of the zero page */
217 cpu_cache_init();
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 /* clear the zero-page */
220 memset(empty_zero_page, 0, PAGE_SIZE);
221 __flush_wback_region(empty_zero_page, PAGE_SIZE);
222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 codesize = (unsigned long) &_etext - (unsigned long) &_text;
224 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
225 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
226
Paul Mundt2cb7ce32006-09-27 18:20:58 +0900227 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
Paul Mundtdfbb9042007-05-23 17:48:36 +0900228 "%dk data, %dk init)\n",
Geert Uytterhoevencc013a82009-09-21 17:02:36 -0700229 nr_free_pages() << (PAGE_SHIFT-10),
Paul Mundt2de212e2007-06-06 12:09:54 +0900230 num_physpages << (PAGE_SHIFT-10),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 codesize >> 10,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 datasize >> 10,
233 initsize >> 10);
234
Paul Mundt19f9a342006-09-27 18:33:49 +0900235 /* Initialize the vDSO */
236 vsyscall_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
239void free_initmem(void)
240{
241 unsigned long addr;
Paul Mundt65463b72005-11-07 00:58:24 -0800242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 addr = (unsigned long)(&__init_begin);
244 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
245 ClearPageReserved(virt_to_page(addr));
Nick Piggin7835e982006-03-22 00:08:40 -0800246 init_page_count(virt_to_page(addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 free_page(addr);
248 totalram_pages++;
249 }
Paul Mundt07cbb412007-06-06 12:23:06 +0900250 printk("Freeing unused kernel memory: %ldk freed\n",
251 ((unsigned long)&__init_end -
252 (unsigned long)&__init_begin) >> 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
255#ifdef CONFIG_BLK_DEV_INITRD
256void free_initrd_mem(unsigned long start, unsigned long end)
257{
258 unsigned long p;
259 for (p = start; p < end; p += PAGE_SIZE) {
260 ClearPageReserved(virt_to_page(p));
Nick Piggin7835e982006-03-22 00:08:40 -0800261 init_page_count(virt_to_page(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 free_page(p);
263 totalram_pages++;
264 }
Paul Mundt2de212e2007-06-06 12:09:54 +0900265 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266}
267#endif
Paul Mundt33d63bd2007-06-07 11:32:52 +0900268
Paul Mundtc15c5f82008-09-20 20:21:33 +0900269#if THREAD_SHIFT < PAGE_SHIFT
270static struct kmem_cache *thread_info_cache;
271
272struct thread_info *alloc_thread_info(struct task_struct *tsk)
273{
274 struct thread_info *ti;
275
276 ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
277 if (unlikely(ti == NULL))
278 return NULL;
279#ifdef CONFIG_DEBUG_STACK_USAGE
280 memset(ti, 0, THREAD_SIZE);
281#endif
282 return ti;
283}
284
285void free_thread_info(struct thread_info *ti)
286{
287 kmem_cache_free(thread_info_cache, ti);
288}
289
290void thread_info_cache_init(void)
291{
292 thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
293 THREAD_SIZE, 0, NULL);
294 BUG_ON(thread_info_cache == NULL);
295}
296#endif /* THREAD_SHIFT < PAGE_SHIFT */
297
Paul Mundt33d63bd2007-06-07 11:32:52 +0900298#ifdef CONFIG_MEMORY_HOTPLUG
Paul Mundt33d63bd2007-06-07 11:32:52 +0900299int arch_add_memory(int nid, u64 start, u64 size)
300{
301 pg_data_t *pgdat;
302 unsigned long start_pfn = start >> PAGE_SHIFT;
303 unsigned long nr_pages = size >> PAGE_SHIFT;
304 int ret;
305
306 pgdat = NODE_DATA(nid);
307
308 /* We only have ZONE_NORMAL, so this is easy.. */
Gary Hadec04fc582009-01-06 14:39:14 -0800309 ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
310 start_pfn, nr_pages);
Paul Mundt33d63bd2007-06-07 11:32:52 +0900311 if (unlikely(ret))
Harvey Harrison866e6b92008-03-04 15:23:47 -0800312 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
Paul Mundt33d63bd2007-06-07 11:32:52 +0900313
314 return ret;
315}
316EXPORT_SYMBOL_GPL(arch_add_memory);
317
Paul Mundt357d5942007-06-11 15:32:07 +0900318#ifdef CONFIG_NUMA
Paul Mundt33d63bd2007-06-07 11:32:52 +0900319int memory_add_physaddr_to_nid(u64 addr)
320{
321 /* Node 0 for now.. */
322 return 0;
323}
324EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
325#endif
Paul Mundt3159e7d2008-09-05 15:39:12 +0900326#endif /* CONFIG_MEMORY_HOTPLUG */