1 /* $Id: init.c,v 1.103 2001/11/19 19:03:08 davem Exp $
2 * linux/arch/sparc/mm/init.c
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
10 #include <linux/config.h>
11 #include <linux/module.h>
12 #include <linux/signal.h>
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/string.h>
17 #include <linux/types.h>
18 #include <linux/ptrace.h>
19 #include <linux/mman.h>
21 #include <linux/swap.h>
22 #include <linux/initrd.h>
23 #include <linux/init.h>
24 #include <linux/highmem.h>
25 #include <linux/bootmem.h>
27 #include <asm/system.h>
28 #include <asm/segment.h>
29 #include <asm/vac-ops.h>
31 #include <asm/pgtable.h>
32 #include <asm/vaddrs.h>
33 #include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
36 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
38 unsigned long *sparc_valid_addr_bitmap;
40 unsigned long phys_base;
41 unsigned long pfn_base;
43 unsigned long page_kernel;
45 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
46 unsigned long sparc_unmapped_base;
48 struct pgtable_cache_struct pgt_quicklists;
50 /* References to section boundaries */
51 extern char __init_begin, __init_end, _start, _end, etext , edata;
53 /* Initial ramdisk setup */
54 extern unsigned int sparc_ramdisk_image;
55 extern unsigned int sparc_ramdisk_size;
57 unsigned long highstart_pfn, highend_pfn;
62 EXPORT_SYMBOL(kmap_prot);
63 EXPORT_SYMBOL(kmap_pte);
65 #define kmap_get_fixmap_pte(vaddr) \
66 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
68 void __init kmap_init(void)
70 /* cache the first kmap pte */
71 kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
72 kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
77 printk("Mem-info:\n");
79 printk("Free swap: %6dkB\n",
80 nr_swap_pages << (PAGE_SHIFT-10));
81 printk("%ld pages of RAM\n", totalram_pages);
82 printk("%d free pages\n", nr_free_pages());
83 #if 0 /* undefined pgtable_cache_size, pgd_cache_size */
84 printk("%ld pages in page table cache\n",pgtable_cache_size);
86 if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
87 printk("%ld entries in page dir cache\n",pgd_cache_size);
92 void __init sparc_context_init(int numctx)
96 ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
98 for(ctx = 0; ctx < numctx; ctx++) {
99 struct ctx_list *clist;
101 clist = (ctx_list_pool + ctx);
102 clist->ctx_number = ctx;
105 ctx_free.next = ctx_free.prev = &ctx_free;
106 ctx_used.next = ctx_used.prev = &ctx_used;
107 for(ctx = 0; ctx < numctx; ctx++)
108 add_to_free_ctxlist(ctx_list_pool + ctx);
111 extern unsigned long cmdline_memory_size;
112 unsigned long last_valid_pfn;
114 unsigned long calc_highpages(void)
119 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
120 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
121 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
123 if (end_pfn <= max_low_pfn)
126 if (start_pfn < max_low_pfn)
127 start_pfn = max_low_pfn;
129 nr += end_pfn - start_pfn;
135 unsigned long calc_max_low_pfn(void)
138 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
139 unsigned long curr_pfn, last_pfn;
141 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
142 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
143 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
145 if (curr_pfn >= tmp) {
151 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
157 unsigned long __init bootmem_init(unsigned long *pages_avail)
159 unsigned long bootmap_size, start_pfn;
160 unsigned long end_of_phys_memory = 0UL;
161 unsigned long bootmap_pfn, bytes_avail, size;
165 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
166 end_of_phys_memory = sp_banks[i].base_addr +
167 sp_banks[i].num_bytes;
168 bytes_avail += sp_banks[i].num_bytes;
169 if (cmdline_memory_size) {
170 if (bytes_avail > cmdline_memory_size) {
171 unsigned long slack = bytes_avail - cmdline_memory_size;
173 bytes_avail -= slack;
174 end_of_phys_memory -= slack;
176 sp_banks[i].num_bytes -= slack;
177 if (sp_banks[i].num_bytes == 0) {
178 sp_banks[i].base_addr = 0xdeadbeef;
180 sp_banks[i+1].num_bytes = 0;
181 sp_banks[i+1].base_addr = 0xdeadbeef;
188 /* Start with page aligned address of last symbol in kernel
191 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
193 /* Now shift down to get the real physical page frame number. */
194 start_pfn >>= PAGE_SHIFT;
196 bootmap_pfn = start_pfn;
198 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
200 max_low_pfn = max_pfn;
201 highstart_pfn = highend_pfn = max_pfn;
203 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
204 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
205 max_low_pfn = calc_max_low_pfn();
206 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
207 calc_highpages() >> (20 - PAGE_SHIFT));
210 #ifdef CONFIG_BLK_DEV_INITRD
211 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
212 if (sparc_ramdisk_image) {
213 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
214 sparc_ramdisk_image -= KERNBASE;
215 initrd_start = sparc_ramdisk_image + phys_base;
216 initrd_end = initrd_start + sparc_ramdisk_size;
217 if (initrd_end > end_of_phys_memory) {
218 printk(KERN_CRIT "initrd extends beyond end of memory "
219 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
220 initrd_end, end_of_phys_memory);
224 if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
225 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
226 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
230 /* Initialize the boot-time allocator. */
231 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
234 /* Now register the available physical memory with the
238 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
239 unsigned long curr_pfn, last_pfn;
241 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
242 if (curr_pfn >= max_low_pfn)
245 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
246 if (last_pfn > max_low_pfn)
247 last_pfn = max_low_pfn;
250 * .. finally, did all the rounding and playing
251 * around just make the area go away?
253 if (last_pfn <= curr_pfn)
256 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
257 *pages_avail += last_pfn - curr_pfn;
259 free_bootmem(sp_banks[i].base_addr, size);
262 #ifdef CONFIG_BLK_DEV_INITRD
264 /* Reserve the initrd image area. */
265 size = initrd_end - initrd_start;
266 reserve_bootmem(initrd_start, size);
267 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
269 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
270 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
273 /* Reserve the kernel text/data/bss. */
274 size = (start_pfn << PAGE_SHIFT) - phys_base;
275 reserve_bootmem(phys_base, size);
276 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
278 /* Reserve the bootmem map. We do not account for it
279 * in pages_avail because we will release that memory
280 * in free_all_bootmem.
283 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
284 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
292 * This is called at the end of unmapping of VMA (zap_page_range),
293 * to rescan the page cache for architecture specific things,
294 * presumably something like sun4/sun4c PMEGs. Most architectures
295 * define check_pgt_cache empty.
297 * We simply copy the 2.4 implementation for now.
299 int pgt_cache_water[2] = { 25, 50 };
301 void check_pgt_cache(void)
303 do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
307 * paging_init() sets up the page tables: We call the MMU specific
308 * init routine based upon the Sun model type on the Sparc.
311 extern void sun4c_paging_init(void);
312 extern void srmmu_paging_init(void);
313 extern void device_scan(void);
315 void __init paging_init(void)
317 switch(sparc_cpu_model) {
322 sparc_unmapped_base = 0xe0000000;
323 BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
328 sparc_unmapped_base = 0x50000000;
329 BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
332 prom_printf("paging_init: Cannot init paging on this Sparc\n");
333 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
334 prom_printf("paging_init: Halting...\n");
338 /* Initialize the protection map with non-constant, MMU dependent values. */
339 protection_map[0] = PAGE_NONE;
340 protection_map[1] = PAGE_READONLY;
341 protection_map[2] = PAGE_COPY;
342 protection_map[3] = PAGE_COPY;
343 protection_map[4] = PAGE_READONLY;
344 protection_map[5] = PAGE_READONLY;
345 protection_map[6] = PAGE_COPY;
346 protection_map[7] = PAGE_COPY;
347 protection_map[8] = PAGE_NONE;
348 protection_map[9] = PAGE_READONLY;
349 protection_map[10] = PAGE_SHARED;
350 protection_map[11] = PAGE_SHARED;
351 protection_map[12] = PAGE_READONLY;
352 protection_map[13] = PAGE_READONLY;
353 protection_map[14] = PAGE_SHARED;
354 protection_map[15] = PAGE_SHARED;
359 struct cache_palias *sparc_aliases;
361 static void __init taint_real_pages(void)
365 for (i = 0; sp_banks[i].num_bytes; i++) {
366 unsigned long start, end;
368 start = sp_banks[i].base_addr;
369 end = start + sp_banks[i].num_bytes;
371 while (start < end) {
372 set_bit(start >> 20, sparc_valid_addr_bitmap);
378 void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
382 #ifdef CONFIG_DEBUG_HIGHMEM
383 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
386 for (tmp = start_pfn; tmp < end_pfn; tmp++) {
387 struct page *page = pfn_to_page(tmp);
389 ClearPageReserved(page);
390 set_bit(PG_highmem, &page->flags);
391 set_page_count(page, 1);
397 void __init mem_init(void)
402 int reservedpages = 0;
405 highmem_start_page = pfn_to_page(highstart_pfn);
407 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
408 prom_printf("BUG: fixmap and pkmap areas overlap\n");
409 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
411 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
413 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
418 /* Saves us work later. */
419 memset((void *)&empty_zero_page, 0, PAGE_SIZE);
421 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
423 sparc_valid_addr_bitmap = (unsigned long *)
424 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
426 if (sparc_valid_addr_bitmap == NULL) {
427 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
430 memset(sparc_valid_addr_bitmap, 0, i << 2);
434 max_mapnr = last_valid_pfn - pfn_base;
435 high_memory = __va(max_low_pfn << PAGE_SHIFT);
437 totalram_pages = free_all_bootmem();
439 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
440 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
441 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
443 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
445 if (end_pfn <= highstart_pfn)
448 if (start_pfn < highstart_pfn)
449 start_pfn = highstart_pfn;
451 map_high_region(start_pfn, end_pfn);
454 totalram_pages += totalhigh_pages;
456 codepages = (((unsigned long) &etext) - ((unsigned long)&_start));
457 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
458 datapages = (((unsigned long) &edata) - ((unsigned long)&etext));
459 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
460 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
461 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
463 /* Ignore memory holes for the purpose of counting reserved pages */
464 for (i=0; i < max_low_pfn; i++)
465 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
466 && PageReserved(pfn_to_page(i)))
469 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
470 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
471 num_physpages << (PAGE_SHIFT - 10),
472 codepages << (PAGE_SHIFT-10),
473 reservedpages << (PAGE_SHIFT - 10),
474 datapages << (PAGE_SHIFT-10),
475 initpages << (PAGE_SHIFT-10),
476 totalhigh_pages << (PAGE_SHIFT-10));
479 void free_initmem (void)
483 addr = (unsigned long)(&__init_begin);
484 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
487 p = virt_to_page(addr);
489 ClearPageReserved(p);
490 set_page_count(p, 1);
495 printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
498 #ifdef CONFIG_BLK_DEV_INITRD
499 void free_initrd_mem(unsigned long start, unsigned long end)
502 printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
503 for (; start < end; start += PAGE_SIZE) {
504 struct page *p = virt_to_page(start);
506 ClearPageReserved(p);
507 set_page_count(p, 1);
514 void sparc_flush_page_to_ram(struct page *page)
516 unsigned long vaddr = (unsigned long)page_address(page);
519 __flush_page_to_ram(vaddr);