--- /dev/null
+/*
+ * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/bootmem.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/lmb.h>
+#include <linux/mm.h> /* mem_init */
+#include <linux/initrd.h>
+#include <linux/pagemap.h>
+#include <linux/pfn.h>
+#include <linux/swap.h>
+
+#include <asm/page.h>
+#include <asm/mmu_context.h>
+#include <asm/pgalloc.h>
+#include <asm/sections.h>
+#include <asm/tlb.h>
+
+unsigned int __page_offset;
+/* EXPORT_SYMBOL(__page_offset); */
+
+char *klimit = _end;
+
+/*
+ * Initialize the bootmem system and give it all the memory we
+ * have available.
+ */
+unsigned int memory_start;
+unsigned int memory_end; /* due to mm/nommu.c */
+unsigned int memory_size;
+
+/*
+ * paging_init() sets up the page tables - in fact we've already done this.
+ */
+static void __init paging_init(void)
+{
+ int i;
+ unsigned long zones_size[MAX_NR_ZONES];
+
+ /*
+ * old: we can DMA to/from any address.put all page into ZONE_DMA
+ * We use only ZONE_NORMAL
+ */
+ zones_size[ZONE_NORMAL] = max_mapnr;
+
+ /* every other zones are empty */
+ for (i = 1; i < MAX_NR_ZONES; i++)
+ zones_size[i] = 0;
+
+ free_area_init(zones_size);
+}
+
+void __init setup_memory(void)
+{
+ int i;
+ unsigned long map_size;
+ u32 kernel_align_start, kernel_align_size;
+
+ /* Find main memory where is the kernel */
+ for (i = 0; i < lmb.memory.cnt; i++) {
+ memory_start = (u32) lmb.memory.region[i].base;
+ memory_end = (u32) lmb.memory.region[i].base
+ + (u32) lmb.memory.region[i].size;
+ if ((memory_start <= (u32)_text) &&
+ ((u32)_text <= memory_end)) {
+ memory_size = memory_end - memory_start;
+ PAGE_OFFSET = memory_start;
+ printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
+ "size 0x%08x\n", __func__, memory_start,
+ memory_end, memory_size);
+ break;
+ }
+ }
+
+ if (!memory_start || !memory_end) {
+ panic("%s: Missing memory setting 0x%08x-0x%08x\n",
+ __func__, memory_start, memory_end);
+ }
+
+ /* reservation of region where is the kernel */
+ kernel_align_start = PAGE_DOWN((u32)_text);
+ /* ALIGN can be remove because _end in vmlinux.lds.S is align */
+ kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
+ lmb_reserve(kernel_align_start, kernel_align_size);
+ printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
+ __func__, kernel_align_start, kernel_align_start
+ + kernel_align_size, kernel_align_size);
+
+ /*
+ * Kernel:
+ * start: base phys address of kernel - page align
+ * end: base phys address of kernel - page align
+ *
+ * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
+ * max_low_pfn
+ * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
+ * num_physpages - number of all pages
+ */
+
+ /* memory start is from the kernel end (aligned) to higher addr */
+ min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
+ /* RAM is assumed contiguous */
+ num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
+ max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;
+
+ printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
+ printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
+ printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
+
+ /*
+ * Find an area to use for the bootmem bitmap.
+ * We look for the first area which is at least
+ * 128kB in length (128kB is enough for a bitmap
+ * for 4GB of memory, using 4kB pages), plus 1 page
+ * (in case the address isn't page-aligned).
+ */
+ map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)_end)),
+ min_low_pfn, max_low_pfn);
+
+ lmb_reserve(PFN_UP(TOPHYS((u32)_end)) << PAGE_SHIFT, map_size);
+
+ /* free bootmem is whole main memory */
+ free_bootmem(memory_start, memory_size);
+
+ /* reserve allocate blocks */
+ for (i = 0; i < lmb.reserved.cnt; i++) {
+ pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
+ (u32) lmb.reserved.region[i].base,
+ (u32) lmb_size_bytes(&lmb.reserved, i));
+ reserve_bootmem(lmb.reserved.region[i].base,
+ lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
+ }
+ paging_init();
+}
+
+void free_init_pages(char *what, unsigned long begin, unsigned long end)
+{
+ unsigned long addr;
+
+ for (addr = begin; addr < end; addr += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(addr));
+ init_page_count(virt_to_page(addr));
+ memset((void *)addr, 0xcc, PAGE_SIZE);
+ free_page(addr);
+ totalram_pages++;
+ }
+ printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
+}
+
+#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));
+ init_page_count(virt_to_page(start));
+ free_page(start);
+ totalram_pages++;
+ pages++;
+ }
+ printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages);
+}
+#endif
+
+void free_initmem(void)
+{
+ free_init_pages("unused kernel memory",
+ (unsigned long)(&__init_begin),
+ (unsigned long)(&__init_end));
+}
+
+/* FIXME from arch/powerpc/mm/mem.c*/
+void show_mem(void)
+{
+ printk(KERN_NOTICE "%s\n", __func__);
+}
+
+void __init mem_init(void)
+{
+ high_memory = (void *)__va(memory_end);
+ /* this will put all memory onto the freelists */
+ totalram_pages += free_all_bootmem();
+
+ printk(KERN_INFO "Memory: %luk/%luk available\n",
+ (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+ num_physpages << (PAGE_SHIFT-10));
+}
+
+/* Check against bounds of physical memory */
+int ___range_ok(unsigned long addr, unsigned long size)
+{
+ return ((addr < memory_start) ||
+ ((addr + size) > memory_end));
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff