blob: 4abf00031daef8521e39d09a1d032f1d937b26af [file] [log] [blame]
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));
Stuart Menefyc6feb612008-09-05 16:06:42 +090073 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;
109 int pgd_idx;
110 unsigned long vaddr;
111
112 vaddr = start & PMD_MASK;
113 end = (end + PMD_SIZE - 1) & PMD_MASK;
114 pgd_idx = pgd_index(vaddr);
115 pgd = pgd_base + pgd_idx;
116
117 for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
118 BUG_ON(pgd_none(*pgd));
119 pud = pud_offset(pgd, 0);
120 BUG_ON(pud_none(*pud));
121 pmd = pmd_offset(pud, 0);
122
123 if (!pmd_present(*pmd)) {
124 pte_t *pte_table;
125 pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
Stuart Menefy2adb4e12007-11-30 17:59:55 +0900126 pmd_populate_kernel(&init_mm, pmd, pte_table);
127 }
128
129 vaddr += PMD_SIZE;
130 }
131}
Yoshinori Sato11cbb702006-12-07 18:07:27 +0900132#endif /* CONFIG_MMU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134/*
135 * paging_init() sets up the page tables
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 */
137void __init paging_init(void)
138{
Paul Mundt2de212e2007-06-06 12:09:54 +0900139 unsigned long max_zone_pfns[MAX_NR_ZONES];
Paul Mundt01066622007-03-28 16:38:13 +0900140 int nid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Paul Mundt01066622007-03-28 16:38:13 +0900142 /* We don't need to map the kernel through the TLB, as
143 * it is permanatly mapped using P1. So clear the
144 * entire pgd. */
145 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Stuart Menefy6e4662f2006-11-21 13:53:44 +0900147 /* Set an initial value for the MMU.TTB so we don't have to
148 * check for a null value. */
149 set_TTB(swapper_pg_dir);
150
Stuart Menefy2adb4e12007-11-30 17:59:55 +0900151 /* Populate the relevant portions of swapper_pg_dir so that
152 * we can use the fixmap entries without calling kmalloc.
153 * pte's will be filled in by __set_fixmap(). */
154 page_table_range_init(FIXADDR_START, FIXADDR_TOP, swapper_pg_dir);
155
Paul Mundt2de212e2007-06-06 12:09:54 +0900156 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
157
Paul Mundt01066622007-03-28 16:38:13 +0900158 for_each_online_node(nid) {
159 pg_data_t *pgdat = NODE_DATA(nid);
Paul Mundt01066622007-03-28 16:38:13 +0900160 unsigned long low, start_pfn;
161
Johannes Weiner3560e242008-07-23 21:28:09 -0700162 start_pfn = pgdat->bdata->node_min_pfn;
Paul Mundt01066622007-03-28 16:38:13 +0900163 low = pgdat->bdata->node_low_pfn;
164
Paul Mundt2de212e2007-06-06 12:09:54 +0900165 if (max_zone_pfns[ZONE_NORMAL] < low)
166 max_zone_pfns[ZONE_NORMAL] = low;
Paul Mundt01066622007-03-28 16:38:13 +0900167
168 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
169 nid, start_pfn, low);
Paul Mundt01066622007-03-28 16:38:13 +0900170 }
Paul Mundt2de212e2007-06-06 12:09:54 +0900171
172 free_area_init_nodes(max_zone_pfns);
Stuart Menefycbaa1182007-11-30 17:06:36 +0900173
Paul Mundtdb026122008-02-13 20:18:01 +0900174#ifdef CONFIG_SUPERH32
Stuart Menefycbaa1182007-11-30 17:06:36 +0900175 /* Set up the uncached fixmap */
176 set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
Paul Mundtdb026122008-02-13 20:18:01 +0900177#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
179
Paul Mundt2cb7ce32006-09-27 18:20:58 +0900180static struct kcore_list kcore_mem, kcore_vmalloc;
Paul Mundtba2727b2007-11-20 15:14:48 +0900181int after_bootmem = 0;
Paul Mundt2cb7ce32006-09-27 18:20:58 +0900182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183void __init mem_init(void)
184{
Paul Mundtdfbb9042007-05-23 17:48:36 +0900185 int codesize, datasize, initsize;
Paul Mundt01066622007-03-28 16:38:13 +0900186 int nid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
Paul Mundt2de212e2007-06-06 12:09:54 +0900188 num_physpages = 0;
189 high_memory = NULL;
190
Paul Mundt01066622007-03-28 16:38:13 +0900191 for_each_online_node(nid) {
192 pg_data_t *pgdat = NODE_DATA(nid);
193 unsigned long node_pages = 0;
194 void *node_high_memory;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Paul Mundt01066622007-03-28 16:38:13 +0900196 num_physpages += pgdat->node_present_pages;
197
198 if (pgdat->node_spanned_pages)
199 node_pages = free_all_bootmem_node(pgdat);
200
201 totalram_pages += node_pages;
202
Paul Mundt2de212e2007-06-06 12:09:54 +0900203 node_high_memory = (void *)__va((pgdat->node_start_pfn +
204 pgdat->node_spanned_pages) <<
205 PAGE_SHIFT);
Paul Mundt01066622007-03-28 16:38:13 +0900206 if (node_high_memory > high_memory)
207 high_memory = node_high_memory;
208 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 /* clear the zero-page */
211 memset(empty_zero_page, 0, PAGE_SIZE);
212 __flush_wback_region(empty_zero_page, PAGE_SIZE);
213
Paul Mundtba2727b2007-11-20 15:14:48 +0900214 after_bootmem = 1;
215
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 codesize = (unsigned long) &_etext - (unsigned long) &_text;
217 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
218 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
219
Paul Mundt2cb7ce32006-09-27 18:20:58 +0900220 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
221 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
222 VMALLOC_END - VMALLOC_START);
223
224 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
Paul Mundtdfbb9042007-05-23 17:48:36 +0900225 "%dk data, %dk init)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
Paul Mundt2de212e2007-06-06 12:09:54 +0900227 num_physpages << (PAGE_SHIFT-10),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 codesize >> 10,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 datasize >> 10,
230 initsize >> 10);
231
232 p3_cache_init();
Paul Mundt19f9a342006-09-27 18:33:49 +0900233
234 /* Initialize the vDSO */
235 vsyscall_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236}
237
238void free_initmem(void)
239{
240 unsigned long addr;
Paul Mundt65463b72005-11-07 00:58:24 -0800241
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 addr = (unsigned long)(&__init_begin);
243 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
244 ClearPageReserved(virt_to_page(addr));
Nick Piggin7835e982006-03-22 00:08:40 -0800245 init_page_count(virt_to_page(addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 free_page(addr);
247 totalram_pages++;
248 }
Paul Mundt07cbb412007-06-06 12:23:06 +0900249 printk("Freeing unused kernel memory: %ldk freed\n",
250 ((unsigned long)&__init_end -
251 (unsigned long)&__init_begin) >> 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252}
253
254#ifdef CONFIG_BLK_DEV_INITRD
255void free_initrd_mem(unsigned long start, unsigned long end)
256{
257 unsigned long p;
258 for (p = start; p < end; p += PAGE_SIZE) {
259 ClearPageReserved(virt_to_page(p));
Nick Piggin7835e982006-03-22 00:08:40 -0800260 init_page_count(virt_to_page(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 free_page(p);
262 totalram_pages++;
263 }
Paul Mundt2de212e2007-06-06 12:09:54 +0900264 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265}
266#endif
Paul Mundt33d63bd2007-06-07 11:32:52 +0900267
Paul Mundtc15c5f82008-09-20 20:21:33 +0900268#if THREAD_SHIFT < PAGE_SHIFT
269static struct kmem_cache *thread_info_cache;
270
271struct thread_info *alloc_thread_info(struct task_struct *tsk)
272{
273 struct thread_info *ti;
274
275 ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
276 if (unlikely(ti == NULL))
277 return NULL;
278#ifdef CONFIG_DEBUG_STACK_USAGE
279 memset(ti, 0, THREAD_SIZE);
280#endif
281 return ti;
282}
283
284void free_thread_info(struct thread_info *ti)
285{
286 kmem_cache_free(thread_info_cache, ti);
287}
288
289void thread_info_cache_init(void)
290{
291 thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
292 THREAD_SIZE, 0, NULL);
293 BUG_ON(thread_info_cache == NULL);
294}
295#endif /* THREAD_SHIFT < PAGE_SHIFT */
296
Paul Mundt33d63bd2007-06-07 11:32:52 +0900297#ifdef CONFIG_MEMORY_HOTPLUG
Paul Mundt33d63bd2007-06-07 11:32:52 +0900298int arch_add_memory(int nid, u64 start, u64 size)
299{
300 pg_data_t *pgdat;
301 unsigned long start_pfn = start >> PAGE_SHIFT;
302 unsigned long nr_pages = size >> PAGE_SHIFT;
303 int ret;
304
305 pgdat = NODE_DATA(nid);
306
307 /* We only have ZONE_NORMAL, so this is easy.. */
308 ret = __add_pages(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages);
309 if (unlikely(ret))
Harvey Harrison866e6b92008-03-04 15:23:47 -0800310 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
Paul Mundt33d63bd2007-06-07 11:32:52 +0900311
312 return ret;
313}
314EXPORT_SYMBOL_GPL(arch_add_memory);
315
Paul Mundt357d5942007-06-11 15:32:07 +0900316#ifdef CONFIG_NUMA
Paul Mundt33d63bd2007-06-07 11:32:52 +0900317int memory_add_physaddr_to_nid(u64 addr)
318{
319 /* Node 0 for now.. */
320 return 0;
321}
322EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
323#endif
Paul Mundt3159e7d2008-09-05 15:39:12 +0900324#endif /* CONFIG_MEMORY_HOTPLUG */