mirror of https://gitee.com/openkylin/linux.git
144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/*
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* linux/arch/m68k/mm/init.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*
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* Contains common initialization routines, specific init code moved
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* to motorola.c and sun3mmu.c
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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/mm.h>
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#include <linux/swap.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/gfp.h>
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#include <asm/setup.h>
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/system.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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#ifdef CONFIG_ATARI
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#include <asm/atari_stram.h>
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#endif
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#include <asm/sections.h>
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#include <asm/tlb.h>
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pg_data_t pg_data_map[MAX_NUMNODES];
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EXPORT_SYMBOL(pg_data_map);
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int m68k_virt_to_node_shift;
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#ifndef CONFIG_SINGLE_MEMORY_CHUNK
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pg_data_t *pg_data_table[65];
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EXPORT_SYMBOL(pg_data_table);
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#endif
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void __init m68k_setup_node(int node)
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{
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#ifndef CONFIG_SINGLE_MEMORY_CHUNK
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struct mem_info *info = m68k_memory + node;
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int i, end;
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i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
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end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
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for (; i <= end; i++) {
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if (pg_data_table[i])
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printk("overlap at %u for chunk %u\n", i, node);
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pg_data_table[i] = pg_data_map + node;
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}
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#endif
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pg_data_map[node].bdata = bootmem_node_data + node;
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node_set_online(node);
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}
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/*
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* ZERO_PAGE is a special page that is used for zero-initialized
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* data and COW.
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*/
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void *empty_zero_page;
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EXPORT_SYMBOL(empty_zero_page);
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extern void init_pointer_table(unsigned long ptable);
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/* References to section boundaries */
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extern pmd_t *zero_pgtable;
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void __init mem_init(void)
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{
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pg_data_t *pgdat;
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int codepages = 0;
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int datapages = 0;
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int initpages = 0;
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int i;
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/* this will put all memory onto the freelists */
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totalram_pages = num_physpages = 0;
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for_each_online_pgdat(pgdat) {
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num_physpages += pgdat->node_present_pages;
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totalram_pages += free_all_bootmem_node(pgdat);
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for (i = 0; i < pgdat->node_spanned_pages; i++) {
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struct page *page = pgdat->node_mem_map + i;
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char *addr = page_to_virt(page);
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if (!PageReserved(page))
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continue;
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if (addr >= _text &&
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addr < _etext)
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codepages++;
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else if (addr >= __init_begin &&
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addr < __init_end)
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initpages++;
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else
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datapages++;
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}
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}
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#ifndef CONFIG_SUN3
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/* insert pointer tables allocated so far into the tablelist */
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init_pointer_table((unsigned long)kernel_pg_dir);
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for (i = 0; i < PTRS_PER_PGD; i++) {
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if (pgd_present(kernel_pg_dir[i]))
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init_pointer_table(__pgd_page(kernel_pg_dir[i]));
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}
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/* insert also pointer table that we used to unmap the zero page */
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if (zero_pgtable)
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init_pointer_table((unsigned long)zero_pgtable);
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#endif
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printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
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nr_free_pages() << (PAGE_SHIFT-10),
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totalram_pages << (PAGE_SHIFT-10),
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codepages << (PAGE_SHIFT-10),
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datapages << (PAGE_SHIFT-10),
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initpages << (PAGE_SHIFT-10));
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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int pages = 0;
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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init_page_count(virt_to_page(start));
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free_page(start);
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totalram_pages++;
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pages++;
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}
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printk ("Freeing initrd memory: %dk freed\n", pages);
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}
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#endif
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