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init.c

/*
 *  linux/arch/m68k/mm/init.c
 *
 *  Copyright (C) 1995  Hamish Macdonald
 *
 *  Contains common initialization routines, specific init code moved
 *  to motorola.c and sun3mmu.c
 */

#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/bootmem.h>

#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/system.h>
#include <asm/machdep.h>
#include <asm/io.h>
#ifdef CONFIG_ATARI
#include <asm/atari_stram.h>
#endif
#include <asm/sections.h>
#include <asm/tlb.h>

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

pg_data_t pg_data_map[MAX_NUMNODES];
EXPORT_SYMBOL(pg_data_map);

int m68k_virt_to_node_shift;

#ifndef CONFIG_SINGLE_MEMORY_CHUNK
pg_data_t *pg_data_table[65];
EXPORT_SYMBOL(pg_data_table);
#endif

void __init m68k_setup_node(int node)
{
#ifndef CONFIG_SINGLE_MEMORY_CHUNK
      struct mem_info *info = m68k_memory + node;
      int i, end;

      i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
      end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
      for (; i <= end; i++) {
            if (pg_data_table[i])
                  printk("overlap at %u for chunk %u\n", i, node);
            pg_data_table[i] = pg_data_map + node;
      }
#endif
      pg_data_map[node].bdata = bootmem_node_data + node;
      node_set_online(node);
}


/*
 * ZERO_PAGE is a special page that is used for zero-initialized
 * data and COW.
 */

void *empty_zero_page;
EXPORT_SYMBOL(empty_zero_page);

extern void init_pointer_table(unsigned long ptable);

/* References to section boundaries */

extern pmd_t *zero_pgtable;

void __init mem_init(void)
{
      pg_data_t *pgdat;
      int codepages = 0;
      int datapages = 0;
      int initpages = 0;
      int i;

#ifdef CONFIG_ATARI
      if (MACH_IS_ATARI)
            atari_stram_mem_init_hook();
#endif

      /* this will put all memory onto the freelists */
      totalram_pages = num_physpages = 0;
      for_each_online_pgdat(pgdat) {
            num_physpages += pgdat->node_present_pages;

            totalram_pages += free_all_bootmem_node(pgdat);
            for (i = 0; i < pgdat->node_spanned_pages; i++) {
                  struct page *page = pgdat->node_mem_map + i;
                  char *addr = page_to_virt(page);

                  if (!PageReserved(page))
                        continue;
                  if (addr >= _text &&
                      addr < _etext)
                        codepages++;
                  else if (addr >= __init_begin &&
                         addr < __init_end)
                        initpages++;
                  else
                        datapages++;
            }
      }

#ifndef CONFIG_SUN3
      /* insert pointer tables allocated so far into the tablelist */
      init_pointer_table((unsigned long)kernel_pg_dir);
      for (i = 0; i < PTRS_PER_PGD; i++) {
            if (pgd_present(kernel_pg_dir[i]))
                  init_pointer_table(__pgd_page(kernel_pg_dir[i]));
      }

      /* insert also pointer table that we used to unmap the zero page */
      if (zero_pgtable)
            init_pointer_table((unsigned long)zero_pgtable);
#endif

      printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
             nr_free_pages() << (PAGE_SHIFT-10),
             totalram_pages << (PAGE_SHIFT-10),
             codepages << (PAGE_SHIFT-10),
             datapages << (PAGE_SHIFT-10),
             initpages << (PAGE_SHIFT-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 ("Freeing initrd memory: %dk freed\n", pages);
}
#endif

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