/*
   * linux/arch/m68k/mm/sun3mmu.c
   *
   * Implementations of mm routines specific to the sun3 MMU.
   *
   * Moved here 8/20/1999 Sam Creasey
   *
   */
  
  #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/pgtable.h>
  #include <asm/system.h>
  #include <asm/machdep.h>
  #include <asm/io.h>
  
  extern void mmu_emu_init (unsigned long bootmem_end);
  
  const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx
  ";
  
  extern unsigned long num_pages;
  
  void free_initmem(void)
  {
  }
  
  /* For the sun3 we try to follow the i386 paging_init() more closely */
  /* start_mem and end_mem have PAGE_OFFSET added already */
  /* now sets up tables using sun3 PTEs rather than i386 as before. --m */
  void __init paging_init(void)
  {
  	pgd_t * pg_dir;
  	pte_t * pg_table;
  	int i;
  	unsigned long address;
  	unsigned long next_pgtable;
  	unsigned long bootmem_end;

  	unsigned long zones_size[MAX_NR_ZONES] = { 0, };

  	unsigned long size;

  #ifdef TEST_VERIFY_AREA
  	wp_works_ok = 0;
  #endif
  	empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);

  
  	address = PAGE_OFFSET;
  	pg_dir = swapper_pg_dir;
  	memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
  	memset (kernel_pg_dir,  0, sizeof (kernel_pg_dir));
  
  	size = num_pages * sizeof(pte_t);
  	size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
  
  	next_pgtable = (unsigned long)alloc_bootmem_pages(size);
  	bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
  
  	/* Map whole memory from PAGE_OFFSET (0x0E000000) */
  	pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
  
  	while (address < (unsigned long)high_memory) {
  		pg_table = (pte_t *) __pa (next_pgtable);
  		next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
  		pgd_val(*pg_dir) = (unsigned long) pg_table;
  		pg_dir++;
  
  		/* now change pg_table to kernel virtual addresses */
  		pg_table = (pte_t *) __va ((unsigned long) pg_table);
  		for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
  			pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
  			if (address >= (unsigned long)high_memory)
  				pte_val (pte) = 0;
  			set_pte (pg_table, pte);
  			address += PAGE_SIZE;
  		}
  	}
  
  	mmu_emu_init(bootmem_end);
  
  	current->mm = NULL;
  
  	/* memory sizing is a hack stolen from motorola.c..  hope it works for us */

  	zones_size[ZONE_DMA] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;

  	/* I really wish I knew why the following change made things better...  -- Sam */
  /*	free_area_init(zones_size); */

  	free_area_init_node(0, zones_size,

  			    (__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL);

  
  }