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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m68knommu/mm/init.c
downloadlinux-stericsson-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/m68knommu/mm/init.c')
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diff --git a/arch/m68knommu/mm/init.c b/arch/m68knommu/mm/init.c
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+++ b/arch/m68knommu/mm/init.c
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+/*
+ * linux/arch/m68knommu/mm/init.c
+ *
+ * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
+ * Kenneth Albanowski <kjahds@kjahds.com>,
+ * Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
+ *
+ * Based on:
+ *
+ * linux/arch/m68k/mm/init.c
+ *
+ * Copyright (C) 1995 Hamish Macdonald
+ *
+ * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
+ * DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
+ */
+
+#include <linux/config.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/init.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/bootmem.h>
+#include <linux/slab.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/machdep.h>
+
+#undef DEBUG
+
+extern void die_if_kernel(char *,struct pt_regs *,long);
+extern void free_initmem(void);
+
+/*
+ * BAD_PAGE is the page that is used for page faults when linux
+ * is out-of-memory. Older versions of linux just did a
+ * do_exit(), but using this instead means there is less risk
+ * for a process dying in kernel mode, possibly leaving a inode
+ * unused etc..
+ *
+ * BAD_PAGETABLE is the accompanying page-table: it is initialized
+ * to point to BAD_PAGE entries.
+ *
+ * ZERO_PAGE is a special page that is used for zero-initialized
+ * data and COW.
+ */
+static unsigned long empty_bad_page_table;
+
+static unsigned long empty_bad_page;
+
+unsigned long empty_zero_page;
+
+extern unsigned long rom_length;
+
+void show_mem(void)
+{
+ unsigned long i;
+ int free = 0, total = 0, reserved = 0, shared = 0;
+ int cached = 0;
+
+ printk(KERN_INFO "\nMem-info:\n");
+ show_free_areas();
+ i = max_mapnr;
+ while (i-- > 0) {
+ total++;
+ if (PageReserved(mem_map+i))
+ reserved++;
+ else if (PageSwapCache(mem_map+i))
+ cached++;
+ else if (!page_count(mem_map+i))
+ free++;
+ else
+ shared += page_count(mem_map+i) - 1;
+ }
+ printk(KERN_INFO "%d pages of RAM\n",total);
+ printk(KERN_INFO "%d free pages\n",free);
+ printk(KERN_INFO "%d reserved pages\n",reserved);
+ printk(KERN_INFO "%d pages shared\n",shared);
+ printk(KERN_INFO "%d pages swap cached\n",cached);
+}
+
+extern unsigned long memory_start;
+extern unsigned long memory_end;
+
+/*
+ * paging_init() continues the virtual memory environment setup which
+ * was begun by the code in arch/head.S.
+ * The parameters are pointers to where to stick the starting and ending
+ * addresses of available kernel virtual memory.
+ */
+void paging_init(void)
+{
+ /*
+ * Make sure start_mem is page aligned, otherwise bootmem and
+ * page_alloc get different views of the world.
+ */
+#ifdef DEBUG
+ unsigned long start_mem = PAGE_ALIGN(memory_start);
+#endif
+ unsigned long end_mem = memory_end & PAGE_MASK;
+
+#ifdef DEBUG
+ printk (KERN_DEBUG "start_mem is %#lx\nvirtual_end is %#lx\n",
+ start_mem, end_mem);
+#endif
+
+ /*
+ * Initialize the bad page table and bad page to point
+ * to a couple of allocated pages.
+ */
+ empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+ empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+ empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+ memset((void *)empty_zero_page, 0, PAGE_SIZE);
+
+ /*
+ * Set up SFC/DFC registers (user data space).
+ */
+ set_fs (USER_DS);
+
+#ifdef DEBUG
+ printk (KERN_DEBUG "before free_area_init\n");
+
+ printk (KERN_DEBUG "free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
+ start_mem, end_mem);
+#endif
+
+ {
+ unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+
+ zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
+ zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
+#ifdef CONFIG_HIGHMEM
+ zones_size[ZONE_HIGHMEM] = 0;
+#endif
+ free_area_init(zones_size);
+ }
+}
+
+void mem_init(void)
+{
+ int codek = 0, datak = 0, initk = 0;
+ unsigned long tmp;
+ extern char _etext, _stext, _sdata, _ebss, __init_begin, __init_end;
+ extern unsigned int _ramend, _rambase;
+ unsigned long len = _ramend - _rambase;
+ unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */
+ unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "Mem_init: start=%lx, end=%lx\n", start_mem, end_mem);
+#endif
+
+ end_mem &= PAGE_MASK;
+ high_memory = (void *) end_mem;
+
+ start_mem = PAGE_ALIGN(start_mem);
+ max_mapnr = num_physpages = (((unsigned long) high_memory) - PAGE_OFFSET) >> PAGE_SHIFT;
+
+ /* this will put all memory onto the freelists */
+ totalram_pages = free_all_bootmem();
+
+ codek = (&_etext - &_stext) >> 10;
+ datak = (&_ebss - &_sdata) >> 10;
+ initk = (&__init_begin - &__init_end) >> 10;
+
+ tmp = nr_free_pages() << PAGE_SHIFT;
+ printk(KERN_INFO "Memory available: %luk/%luk RAM, %luk/%luk ROM (%dk kernel code, %dk data)\n",
+ tmp >> 10,
+ len >> 10,
+ (rom_length > 0) ? ((rom_length >> 10) - codek) : 0,
+ rom_length >> 10,
+ codek,
+ datak
+ );
+}
+
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+ int pages = 0;
+ for (; start < end; start += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(start));
+ set_page_count(virt_to_page(start), 1);
+ free_page(start);
+ totalram_pages++;
+ pages++;
+ }
+ printk (KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages);
+}
+#endif
+
+void
+free_initmem()
+{
+#ifdef CONFIG_RAMKERNEL
+ unsigned long addr;
+ extern char __init_begin, __init_end;
+ /*
+ * The following code should be cool even if these sections
+ * are not page aligned.
+ */
+ addr = PAGE_ALIGN((unsigned long)(&__init_begin));
+ /* next to check that the page we free is not a partial page */
+ for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(addr));
+ set_page_count(virt_to_page(addr), 1);
+ free_page(addr);
+ totalram_pages++;
+ }
+ printk(KERN_NOTICE "Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n",
+ (addr - PAGE_ALIGN((long) &__init_begin)) >> 10,
+ (int)(PAGE_ALIGN((unsigned long)(&__init_begin))),
+ (int)(addr - PAGE_SIZE));
+#endif
+}
+