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sun3mmu.c

/*
 * 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\n";

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);


}



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