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/*

 * linux/include/asm-arm/proc-armo/mmap.h

 *

 * Copyright (C) 1996 Russell King

 *

 * This contains the code to setup the memory map on an ARM2/ARM250/ARM3

 * machine. This is both processor & architecture specific, and requires

 * some more work to get it to fit into our separate processor and

 * architecture structure.

 */

static unsigned long phys_screen_end;

int page_nr;

#define setup_processor_functions()

/*

 * This routine needs more work to make it dynamically release/allocate mem!

 */

unsigned long map_screen_mem(unsigned long log_start, unsigned long kmem, int update)

{

        static int updated = 0;

        unsigned long address = SCREEN_START, i;

        pgd_t *pg_dir;

        pmd_t *pm_dir;

        pte_t *pt_entry;

        if (updated)

                return 0;

        updated = update;

        pg_dir = swapper_pg_dir + (SCREEN1_BASE >> PGDIR_SHIFT);

        pm_dir = pmd_offset(pg_dir, SCREEN1_BASE);

        pt_entry = pte_offset(pm_dir, SCREEN1_BASE);

        for (i = SCREEN1_BASE; i < SCREEN1_END; i += PAGE_SIZE) {

                if (i >= log_start) {

                        *pt_entry = mk_pte(address, __pgprot(_PAGE_PRESENT));

                        address += PAGE_SIZE;

                } else

                        *pt_entry = mk_pte(0, __pgprot(0));

                pt_entry++;

        }

        phys_screen_end = address;

        if (update)

                flush_tlb_all ();

        return kmem;

}

static inline unsigned long setup_pagetables(unsigned long start_mem, unsigned long end_mem)

{

        unsigned long address;

        unsigned int spi;

        page_nr = MAP_NR(end_mem);

        /* Allocate zero page */

        address = PAGE_OFFSET + 480*1024;

        for (spi = 0; spi < 32768 >> PAGE_SHIFT; spi++) {

                pgd_val(swapper_pg_dir[spi]) = pte_val(mk_pte(address, PAGE_READONLY));

                address += PAGE_SIZE;

        }

        while (spi < (PAGE_OFFSET >> PGDIR_SHIFT))

                pgd_val(swapper_pg_dir[spi++]) = 0;

        map_screen_mem (SCREEN1_END - 480*1024, 0, 0);

        return start_mem;

}

static inline void mark_usable_memory_areas(unsigned long *start_mem, unsigned long end_mem)

{

        unsigned long smem = PAGE_ALIGN(*start_mem);

        while (smem < end_mem) {

                clear_bit(PG_reserved, &mem_map[MAP_NR(smem)].flags);

                smem += PAGE_SIZE;

        }

        for (smem = phys_screen_end; smem < SCREEN2_END; smem += PAGE_SIZE)

                clear_bit(PG_reserved, &mem_map[MAP_NR(smem)].flags);

}