Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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);

        memset(empty_zero_page, 0, 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, NODE_DATA(0), zones_size,

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

}