3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
6 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
7 * Copyright (C) 1996 Paul Mackerras
8 * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
10 * Derived from "arch/i386/mm/init.c"
11 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
13 * Dave Engebretsen <engebret@us.ibm.com>
14 * Rework for PPC64 port.
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
23 #include <linux/config.h>
24 #include <linux/signal.h>
25 #include <linux/sched.h>
26 #include <linux/kernel.h>
27 #include <linux/errno.h>
28 #include <linux/string.h>
29 #include <linux/types.h>
30 #include <linux/mman.h>
32 #include <linux/swap.h>
33 #include <linux/stddef.h>
34 #include <linux/vmalloc.h>
35 #include <linux/init.h>
36 #include <linux/delay.h>
37 #include <linux/bootmem.h>
38 #include <linux/highmem.h>
39 #include <linux/idr.h>
40 #include <linux/nodemask.h>
41 #include <linux/module.h>
43 #include <asm/pgalloc.h>
49 #include <asm/mmu_context.h>
50 #include <asm/pgtable.h>
52 #include <asm/uaccess.h>
54 #include <asm/machdep.h>
57 #include <asm/processor.h>
58 #include <asm/mmzone.h>
59 #include <asm/cputable.h>
60 #include <asm/ppcdebug.h>
61 #include <asm/sections.h>
62 #include <asm/system.h>
63 #include <asm/iommu.h>
64 #include <asm/abs_addr.h>
66 #include <asm/imalloc.h>
68 #if PGTABLE_RANGE > USER_VSID_RANGE
69 #warning Limited user VSID range means pagetable space is wasted
72 #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
73 #warning TASK_SIZE is smaller than it needs to be.
77 unsigned long ioremap_bot = IMALLOC_BASE;
78 static unsigned long phbs_io_bot = PHBS_IO_BASE;
80 extern pgd_t swapper_pg_dir[];
81 extern struct task_struct *current_set[NR_CPUS];
83 unsigned long klimit = (unsigned long)_end;
85 unsigned long _SDR1=0;
88 /* max amount of RAM to use */
89 unsigned long __max_memory;
91 /* info on what we think the IO hole is */
92 unsigned long io_hole_start;
93 unsigned long io_hole_size;
96 * Do very early mm setup.
98 void __init mm_init_ppc64(void)
100 #ifndef CONFIG_PPC_ISERIES
104 ppc64_boot_msg(0x100, "MM Init");
106 /* This is the story of the IO hole... please, keep seated,
107 * unfortunately, we are out of oxygen masks at the moment.
108 * So we need some rough way to tell where your big IO hole
109 * is. On pmac, it's between 2G and 4G, on POWER3, it's around
110 * that area as well, on POWER4 we don't have one, etc...
111 * We need that as a "hint" when sizing the TCE table on POWER3
112 * So far, the simplest way that seem work well enough for us it
113 * to just assume that the first discontinuity in our physical
114 * RAM layout is the IO hole. That may not be correct in the future
115 * (and isn't on iSeries but then we don't care ;)
118 #ifndef CONFIG_PPC_ISERIES
119 for (i = 1; i < lmb.memory.cnt; i++) {
120 unsigned long base, prevbase, prevsize;
122 prevbase = lmb.memory.region[i-1].base;
123 prevsize = lmb.memory.region[i-1].size;
124 base = lmb.memory.region[i].base;
125 if (base > (prevbase + prevsize)) {
126 io_hole_start = prevbase + prevsize;
127 io_hole_size = base - (prevbase + prevsize);
131 #endif /* CONFIG_PPC_ISERIES */
133 printk("IO Hole assumed to be %lx -> %lx\n",
134 io_hole_start, io_hole_start + io_hole_size - 1);
136 ppc64_boot_msg(0x100, "MM Init Done");
139 void free_initmem(void)
143 addr = (unsigned long)__init_begin;
144 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
145 memset((void *)addr, 0xcc, PAGE_SIZE);
146 ClearPageReserved(virt_to_page(addr));
147 set_page_count(virt_to_page(addr), 1);
151 printk ("Freeing unused kernel memory: %luk freed\n",
152 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
155 #ifdef CONFIG_BLK_DEV_INITRD
156 void free_initrd_mem(unsigned long start, unsigned long end)
159 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
160 for (; start < end; start += PAGE_SIZE) {
161 ClearPageReserved(virt_to_page(start));
162 set_page_count(virt_to_page(start), 1);
170 * Initialize the bootmem system and give it all the memory we
173 #ifndef CONFIG_NEED_MULTIPLE_NODES
174 void __init do_init_bootmem(void)
177 unsigned long start, bootmap_pages;
178 unsigned long total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
182 * Find an area to use for the bootmem bitmap. Calculate the size of
183 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
184 * Add 1 additional page in case the address isn't page-aligned.
186 bootmap_pages = bootmem_bootmap_pages(total_pages);
188 start = lmb_alloc(bootmap_pages<<PAGE_SHIFT, PAGE_SIZE);
191 boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
193 max_pfn = max_low_pfn;
195 /* Add all physical memory to the bootmem map, mark each area
198 for (i=0; i < lmb.memory.cnt; i++)
199 free_bootmem(lmb.memory.region[i].base,
200 lmb_size_bytes(&lmb.memory, i));
202 /* reserve the sections we're already using */
203 for (i=0; i < lmb.reserved.cnt; i++)
204 reserve_bootmem(lmb.reserved.region[i].base,
205 lmb_size_bytes(&lmb.reserved, i));
207 for (i=0; i < lmb.memory.cnt; i++)
208 memory_present(0, lmb_start_pfn(&lmb.memory, i),
209 lmb_end_pfn(&lmb.memory, i));
213 * paging_init() sets up the page tables - in fact we've already done this.
215 void __init paging_init(void)
217 unsigned long zones_size[MAX_NR_ZONES];
218 unsigned long zholes_size[MAX_NR_ZONES];
219 unsigned long total_ram = lmb_phys_mem_size();
220 unsigned long top_of_ram = lmb_end_of_DRAM();
222 printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
223 top_of_ram, total_ram);
224 printk(KERN_INFO "Memory hole size: %ldMB\n",
225 (top_of_ram - total_ram) >> 20);
227 * All pages are DMA-able so we put them all in the DMA zone.
229 memset(zones_size, 0, sizeof(zones_size));
230 memset(zholes_size, 0, sizeof(zholes_size));
232 zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
233 zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT;
235 free_area_init_node(0, NODE_DATA(0), zones_size,
236 __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
238 #endif /* ! CONFIG_NEED_MULTIPLE_NODES */
240 static struct kcore_list kcore_vmem;
242 static int __init setup_kcore(void)
246 for (i=0; i < lmb.memory.cnt; i++) {
247 unsigned long base, size;
248 struct kcore_list *kcore_mem;
250 base = lmb.memory.region[i].base;
251 size = lmb.memory.region[i].size;
253 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
254 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
256 panic("mem_init: kmalloc failed\n");
258 kclist_add(kcore_mem, __va(base), size);
261 kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
265 module_init(setup_kcore);
267 void __init mem_init(void)
269 #ifdef CONFIG_NEED_MULTIPLE_NODES
275 unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
277 num_physpages = max_low_pfn; /* RAM is assumed contiguous */
278 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
280 #ifdef CONFIG_NEED_MULTIPLE_NODES
281 for_each_online_node(nid) {
282 if (NODE_DATA(nid)->node_spanned_pages != 0) {
283 printk("freeing bootmem node %x\n", nid);
285 free_all_bootmem_node(NODE_DATA(nid));
289 max_mapnr = num_physpages;
290 totalram_pages += free_all_bootmem();
293 for_each_pgdat(pgdat) {
294 for (i = 0; i < pgdat->node_spanned_pages; i++) {
295 page = pgdat_page_nr(pgdat, i);
296 if (PageReserved(page))
301 codesize = (unsigned long)&_etext - (unsigned long)&_stext;
302 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
303 datasize = (unsigned long)&_edata - (unsigned long)&__init_end;
304 bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
306 printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
307 "%luk reserved, %luk data, %luk bss, %luk init)\n",
308 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
309 num_physpages << (PAGE_SHIFT-10),
311 reservedpages << (PAGE_SHIFT-10),
318 /* Initialize the vDSO */
322 void __iomem * reserve_phb_iospace(unsigned long size)
324 void __iomem *virt_addr;
326 if (phbs_io_bot >= IMALLOC_BASE)
327 panic("reserve_phb_iospace(): phb io space overflow\n");
329 virt_addr = (void __iomem *) phbs_io_bot;
335 static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
337 memset(addr, 0, kmem_cache_size(cache));
340 static const int pgtable_cache_size[2] = {
341 PTE_TABLE_SIZE, PMD_TABLE_SIZE
343 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
344 "pgd_pte_cache", "pud_pmd_cache",
347 kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
349 void pgtable_cache_init(void)
353 BUILD_BUG_ON(PTE_TABLE_SIZE != pgtable_cache_size[PTE_CACHE_NUM]);
354 BUILD_BUG_ON(PMD_TABLE_SIZE != pgtable_cache_size[PMD_CACHE_NUM]);
355 BUILD_BUG_ON(PUD_TABLE_SIZE != pgtable_cache_size[PUD_CACHE_NUM]);
356 BUILD_BUG_ON(PGD_TABLE_SIZE != pgtable_cache_size[PGD_CACHE_NUM]);
358 for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
359 int size = pgtable_cache_size[i];
360 const char *name = pgtable_cache_name[i];
362 pgtable_cache[i] = kmem_cache_create(name,
365 | SLAB_MUST_HWCACHE_ALIGN,
368 if (! pgtable_cache[i])
369 panic("pgtable_cache_init(): could not create %s!\n",
374 pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr,
375 unsigned long size, pgprot_t vma_prot)
377 if (ppc_md.phys_mem_access_prot)
378 return ppc_md.phys_mem_access_prot(file, addr, size, vma_prot);
380 if (!page_is_ram(addr >> PAGE_SHIFT))
381 vma_prot = __pgprot(pgprot_val(vma_prot)
382 | _PAGE_GUARDED | _PAGE_NO_CACHE);
385 EXPORT_SYMBOL(phys_mem_access_prot);