2008-05-20 01:53:02 +02:00
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/*
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2005-04-17 00:20:36 +02:00
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* linux/arch/sparc/mm/init.c
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
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* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 2000 Anton Blanchard (anton@samba.org)
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*/
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#include <linux/module.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/initrd.h>
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#include <linux/init.h>
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#include <linux/highmem.h>
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#include <linux/bootmem.h>
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2008-07-15 07:57:29 +02:00
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#include <linux/pagemap.h>
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2008-09-04 01:29:42 +02:00
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#include <linux/poison.h>
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2005-04-17 00:20:36 +02:00
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2008-12-27 09:35:12 +01:00
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#include <asm/sections.h>
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2005-04-17 00:20:36 +02:00
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#include <asm/system.h>
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#include <asm/vac-ops.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/vaddrs.h>
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#include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
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#include <asm/tlb.h>
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2006-06-24 00:53:31 +02:00
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#include <asm/prom.h>
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2005-04-17 00:20:36 +02:00
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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unsigned long *sparc_valid_addr_bitmap;
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2009-01-09 01:58:05 +01:00
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EXPORT_SYMBOL(sparc_valid_addr_bitmap);
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2005-04-17 00:20:36 +02:00
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unsigned long phys_base;
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2009-01-09 01:58:05 +01:00
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EXPORT_SYMBOL(phys_base);
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2005-04-17 00:20:36 +02:00
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unsigned long pfn_base;
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2009-01-09 01:58:05 +01:00
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EXPORT_SYMBOL(pfn_base);
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2005-04-17 00:20:36 +02:00
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unsigned long page_kernel;
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2009-01-09 01:58:05 +01:00
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EXPORT_SYMBOL(page_kernel);
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2005-04-17 00:20:36 +02:00
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struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
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unsigned long sparc_unmapped_base;
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struct pgtable_cache_struct pgt_quicklists;
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/* Initial ramdisk setup */
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extern unsigned int sparc_ramdisk_image;
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extern unsigned int sparc_ramdisk_size;
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unsigned long highstart_pfn, highend_pfn;
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pte_t *kmap_pte;
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pgprot_t kmap_prot;
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#define kmap_get_fixmap_pte(vaddr) \
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pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
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void __init kmap_init(void)
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{
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/* cache the first kmap pte */
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kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
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kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
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}
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void show_mem(void)
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{
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printk("Mem-info:\n");
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show_free_areas();
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printk("Free swap: %6ldkB\n",
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nr_swap_pages << (PAGE_SHIFT-10));
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printk("%ld pages of RAM\n", totalram_pages);
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2007-03-14 10:18:50 +01:00
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printk("%ld free pages\n", nr_free_pages());
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2005-04-17 00:20:36 +02:00
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#if 0 /* undefined pgtable_cache_size, pgd_cache_size */
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printk("%ld pages in page table cache\n",pgtable_cache_size);
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#ifndef CONFIG_SMP
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if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
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printk("%ld entries in page dir cache\n",pgd_cache_size);
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#endif
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#endif
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}
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void __init sparc_context_init(int numctx)
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{
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int ctx;
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ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
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for(ctx = 0; ctx < numctx; ctx++) {
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struct ctx_list *clist;
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clist = (ctx_list_pool + ctx);
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clist->ctx_number = ctx;
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clist->ctx_mm = NULL;
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}
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ctx_free.next = ctx_free.prev = &ctx_free;
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ctx_used.next = ctx_used.prev = &ctx_used;
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for(ctx = 0; ctx < numctx; ctx++)
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add_to_free_ctxlist(ctx_list_pool + ctx);
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}
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extern unsigned long cmdline_memory_size;
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unsigned long last_valid_pfn;
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unsigned long calc_highpages(void)
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{
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int i;
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int nr = 0;
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for (i = 0; sp_banks[i].num_bytes != 0; i++) {
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unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
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unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
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if (end_pfn <= max_low_pfn)
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continue;
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if (start_pfn < max_low_pfn)
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start_pfn = max_low_pfn;
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nr += end_pfn - start_pfn;
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}
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return nr;
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}
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2008-06-05 20:41:51 +02:00
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static unsigned long calc_max_low_pfn(void)
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2005-04-17 00:20:36 +02:00
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{
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int i;
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unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
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unsigned long curr_pfn, last_pfn;
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last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
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for (i = 1; sp_banks[i].num_bytes != 0; i++) {
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curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
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if (curr_pfn >= tmp) {
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if (last_pfn < tmp)
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tmp = last_pfn;
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break;
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}
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last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
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}
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return tmp;
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}
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unsigned long __init bootmem_init(unsigned long *pages_avail)
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{
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unsigned long bootmap_size, start_pfn;
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unsigned long end_of_phys_memory = 0UL;
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unsigned long bootmap_pfn, bytes_avail, size;
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int i;
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bytes_avail = 0UL;
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for (i = 0; sp_banks[i].num_bytes != 0; i++) {
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end_of_phys_memory = sp_banks[i].base_addr +
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sp_banks[i].num_bytes;
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bytes_avail += sp_banks[i].num_bytes;
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if (cmdline_memory_size) {
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if (bytes_avail > cmdline_memory_size) {
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unsigned long slack = bytes_avail - cmdline_memory_size;
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bytes_avail -= slack;
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end_of_phys_memory -= slack;
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sp_banks[i].num_bytes -= slack;
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if (sp_banks[i].num_bytes == 0) {
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sp_banks[i].base_addr = 0xdeadbeef;
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} else {
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sp_banks[i+1].num_bytes = 0;
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sp_banks[i+1].base_addr = 0xdeadbeef;
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}
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break;
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}
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}
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}
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/* Start with page aligned address of last symbol in kernel
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* image.
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*/
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start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
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/* Now shift down to get the real physical page frame number. */
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start_pfn >>= PAGE_SHIFT;
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bootmap_pfn = start_pfn;
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max_pfn = end_of_phys_memory >> PAGE_SHIFT;
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max_low_pfn = max_pfn;
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highstart_pfn = highend_pfn = max_pfn;
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if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
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highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
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max_low_pfn = calc_max_low_pfn();
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printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
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calc_highpages() >> (20 - PAGE_SHIFT));
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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/* Now have to check initial ramdisk, so that bootmap does not overwrite it */
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if (sparc_ramdisk_image) {
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2007-08-21 00:52:18 +02:00
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if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
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sparc_ramdisk_image -= KERNBASE;
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2005-04-17 00:20:36 +02:00
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initrd_start = sparc_ramdisk_image + phys_base;
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initrd_end = initrd_start + sparc_ramdisk_size;
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if (initrd_end > end_of_phys_memory) {
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printk(KERN_CRIT "initrd extends beyond end of memory "
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"(0x%016lx > 0x%016lx)\ndisabling initrd\n",
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initrd_end, end_of_phys_memory);
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initrd_start = 0;
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}
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if (initrd_start) {
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if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
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initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
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bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
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}
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}
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#endif
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/* Initialize the boot-time allocator. */
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bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
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max_low_pfn);
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/* Now register the available physical memory with the
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* allocator.
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*/
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*pages_avail = 0;
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for (i = 0; sp_banks[i].num_bytes != 0; i++) {
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unsigned long curr_pfn, last_pfn;
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curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
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if (curr_pfn >= max_low_pfn)
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break;
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last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
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if (last_pfn > max_low_pfn)
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last_pfn = max_low_pfn;
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/*
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* .. finally, did all the rounding and playing
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* around just make the area go away?
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*/
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if (last_pfn <= curr_pfn)
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continue;
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size = (last_pfn - curr_pfn) << PAGE_SHIFT;
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*pages_avail += last_pfn - curr_pfn;
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free_bootmem(sp_banks[i].base_addr, size);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start) {
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/* Reserve the initrd image area. */
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size = initrd_end - initrd_start;
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2008-02-07 09:15:17 +01:00
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reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
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2005-04-17 00:20:36 +02:00
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*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
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initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
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initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
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}
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#endif
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/* Reserve the kernel text/data/bss. */
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size = (start_pfn << PAGE_SHIFT) - phys_base;
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2008-02-07 09:15:17 +01:00
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reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
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2005-04-17 00:20:36 +02:00
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*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
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/* Reserve the bootmem map. We do not account for it
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* in pages_avail because we will release that memory
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* in free_all_bootmem.
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*/
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size = bootmap_size;
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2008-02-07 09:15:17 +01:00
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reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
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2005-04-17 00:20:36 +02:00
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*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
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return max_pfn;
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}
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/*
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* check_pgt_cache
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*
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* This is called at the end of unmapping of VMA (zap_page_range),
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* to rescan the page cache for architecture specific things,
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* presumably something like sun4/sun4c PMEGs. Most architectures
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* define check_pgt_cache empty.
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*
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* We simply copy the 2.4 implementation for now.
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*/
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2008-06-05 20:41:51 +02:00
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static int pgt_cache_water[2] = { 25, 50 };
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2005-04-17 00:20:36 +02:00
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void check_pgt_cache(void)
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{
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do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
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}
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/*
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* paging_init() sets up the page tables: We call the MMU specific
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* init routine based upon the Sun model type on the Sparc.
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*
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*/
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extern void sun4c_paging_init(void);
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extern void srmmu_paging_init(void);
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extern void device_scan(void);
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2007-07-22 04:20:34 +02:00
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pgprot_t PAGE_SHARED __read_mostly;
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EXPORT_SYMBOL(PAGE_SHARED);
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2005-04-17 00:20:36 +02:00
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void __init paging_init(void)
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{
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switch(sparc_cpu_model) {
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case sun4c:
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case sun4e:
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case sun4:
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sun4c_paging_init();
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sparc_unmapped_base = 0xe0000000;
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BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
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break;
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case sun4m:
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case sun4d:
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srmmu_paging_init();
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sparc_unmapped_base = 0x50000000;
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BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
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break;
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default:
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|
prom_printf("paging_init: Cannot init paging on this Sparc\n");
|
|
|
|
prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
|
|
|
|
prom_printf("paging_init: Halting...\n");
|
|
|
|
prom_halt();
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Initialize the protection map with non-constant, MMU dependent values. */
|
|
|
|
protection_map[0] = PAGE_NONE;
|
|
|
|
protection_map[1] = PAGE_READONLY;
|
|
|
|
protection_map[2] = PAGE_COPY;
|
|
|
|
protection_map[3] = PAGE_COPY;
|
|
|
|
protection_map[4] = PAGE_READONLY;
|
|
|
|
protection_map[5] = PAGE_READONLY;
|
|
|
|
protection_map[6] = PAGE_COPY;
|
|
|
|
protection_map[7] = PAGE_COPY;
|
|
|
|
protection_map[8] = PAGE_NONE;
|
|
|
|
protection_map[9] = PAGE_READONLY;
|
|
|
|
protection_map[10] = PAGE_SHARED;
|
|
|
|
protection_map[11] = PAGE_SHARED;
|
|
|
|
protection_map[12] = PAGE_READONLY;
|
|
|
|
protection_map[13] = PAGE_READONLY;
|
|
|
|
protection_map[14] = PAGE_SHARED;
|
|
|
|
protection_map[15] = PAGE_SHARED;
|
|
|
|
btfixup();
|
2006-06-24 00:53:31 +02:00
|
|
|
prom_build_devicetree();
|
2005-04-17 00:20:36 +02:00
|
|
|
device_scan();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __init taint_real_pages(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; sp_banks[i].num_bytes; i++) {
|
|
|
|
unsigned long start, end;
|
|
|
|
|
|
|
|
start = sp_banks[i].base_addr;
|
|
|
|
end = start + sp_banks[i].num_bytes;
|
|
|
|
|
|
|
|
while (start < end) {
|
|
|
|
set_bit(start >> 20, sparc_valid_addr_bitmap);
|
|
|
|
start += PAGE_SIZE;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-06-05 20:41:51 +02:00
|
|
|
static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
unsigned long tmp;
|
|
|
|
|
|
|
|
#ifdef CONFIG_DEBUG_HIGHMEM
|
|
|
|
printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
for (tmp = start_pfn; tmp < end_pfn; tmp++) {
|
|
|
|
struct page *page = pfn_to_page(tmp);
|
|
|
|
|
|
|
|
ClearPageReserved(page);
|
2006-03-22 09:08:40 +01:00
|
|
|
init_page_count(page);
|
2005-04-17 00:20:36 +02:00
|
|
|
__free_page(page);
|
|
|
|
totalhigh_pages++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void __init mem_init(void)
|
|
|
|
{
|
|
|
|
int codepages = 0;
|
|
|
|
int datapages = 0;
|
|
|
|
int initpages = 0;
|
|
|
|
int reservedpages = 0;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
|
|
|
|
prom_printf("BUG: fixmap and pkmap areas overlap\n");
|
|
|
|
prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
|
|
|
|
PKMAP_BASE,
|
|
|
|
(unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
|
|
|
|
FIXADDR_START);
|
|
|
|
prom_printf("Please mail sparclinux@vger.kernel.org.\n");
|
|
|
|
prom_halt();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Saves us work later. */
|
|
|
|
memset((void *)&empty_zero_page, 0, PAGE_SIZE);
|
|
|
|
|
|
|
|
i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
|
|
|
|
i += 1;
|
|
|
|
sparc_valid_addr_bitmap = (unsigned long *)
|
|
|
|
__alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
|
|
|
|
|
|
|
|
if (sparc_valid_addr_bitmap == NULL) {
|
|
|
|
prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
|
|
|
|
prom_halt();
|
|
|
|
}
|
|
|
|
memset(sparc_valid_addr_bitmap, 0, i << 2);
|
|
|
|
|
|
|
|
taint_real_pages();
|
|
|
|
|
|
|
|
max_mapnr = last_valid_pfn - pfn_base;
|
|
|
|
high_memory = __va(max_low_pfn << PAGE_SHIFT);
|
|
|
|
|
|
|
|
totalram_pages = free_all_bootmem();
|
|
|
|
|
|
|
|
for (i = 0; sp_banks[i].num_bytes != 0; i++) {
|
|
|
|
unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
|
|
|
|
unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
|
|
|
|
|
|
|
|
num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
|
|
|
|
|
|
|
|
if (end_pfn <= highstart_pfn)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (start_pfn < highstart_pfn)
|
|
|
|
start_pfn = highstart_pfn;
|
|
|
|
|
|
|
|
map_high_region(start_pfn, end_pfn);
|
|
|
|
}
|
|
|
|
|
|
|
|
totalram_pages += totalhigh_pages;
|
|
|
|
|
2008-12-27 09:35:12 +01:00
|
|
|
codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
|
2005-04-17 00:20:36 +02:00
|
|
|
codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
|
2008-12-27 09:35:12 +01:00
|
|
|
datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
|
2005-04-17 00:20:36 +02:00
|
|
|
datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
|
|
|
|
initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
|
|
|
|
initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
|
|
|
|
|
|
|
|
/* Ignore memory holes for the purpose of counting reserved pages */
|
|
|
|
for (i=0; i < max_low_pfn; i++)
|
|
|
|
if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
|
|
|
|
&& PageReserved(pfn_to_page(i)))
|
|
|
|
reservedpages++;
|
|
|
|
|
|
|
|
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
|
|
|
|
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
|
|
|
|
num_physpages << (PAGE_SHIFT - 10),
|
|
|
|
codepages << (PAGE_SHIFT-10),
|
|
|
|
reservedpages << (PAGE_SHIFT - 10),
|
|
|
|
datapages << (PAGE_SHIFT-10),
|
|
|
|
initpages << (PAGE_SHIFT-10),
|
|
|
|
totalhigh_pages << (PAGE_SHIFT-10));
|
|
|
|
}
|
|
|
|
|
|
|
|
void free_initmem (void)
|
|
|
|
{
|
|
|
|
unsigned long addr;
|
2008-12-27 09:35:12 +01:00
|
|
|
unsigned long freed;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
addr = (unsigned long)(&__init_begin);
|
2008-12-27 09:35:12 +01:00
|
|
|
freed = (unsigned long)(&__init_end) - addr;
|
2005-04-17 00:20:36 +02:00
|
|
|
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
|
|
|
|
struct page *p;
|
|
|
|
|
2008-09-04 01:29:42 +02:00
|
|
|
memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
|
2005-04-17 00:20:36 +02:00
|
|
|
p = virt_to_page(addr);
|
|
|
|
|
|
|
|
ClearPageReserved(p);
|
2006-03-22 09:08:40 +01:00
|
|
|
init_page_count(p);
|
2005-04-17 00:20:36 +02:00
|
|
|
__free_page(p);
|
|
|
|
totalram_pages++;
|
|
|
|
num_physpages++;
|
|
|
|
}
|
2008-12-27 09:35:12 +01:00
|
|
|
printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
|
|
|
|
freed >> 10);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
|
|
{
|
|
|
|
if (start < end)
|
2008-09-04 01:29:42 +02:00
|
|
|
printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
|
|
|
|
(end - start) >> 10);
|
2005-04-17 00:20:36 +02:00
|
|
|
for (; start < end; start += PAGE_SIZE) {
|
2008-09-04 01:29:42 +02:00
|
|
|
struct page *p;
|
|
|
|
|
|
|
|
memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
|
|
|
|
p = virt_to_page(start);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
ClearPageReserved(p);
|
2006-03-22 09:08:40 +01:00
|
|
|
init_page_count(p);
|
2005-04-17 00:20:36 +02:00
|
|
|
__free_page(p);
|
2008-09-04 01:29:42 +02:00
|
|
|
totalram_pages++;
|
2005-04-17 00:20:36 +02:00
|
|
|
num_physpages++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
void sparc_flush_page_to_ram(struct page *page)
|
|
|
|
{
|
|
|
|
unsigned long vaddr = (unsigned long)page_address(page);
|
|
|
|
|
|
|
|
if (vaddr)
|
|
|
|
__flush_page_to_ram(vaddr);
|
|
|
|
}
|
2009-01-09 01:58:05 +01:00
|
|
|
EXPORT_SYMBOL(sparc_flush_page_to_ram);
|