Subversion Repositories or1k

/*

 * linux/include/asm-arm/arch-rpc/mmap.h

 *

 * Copyright (C) 1996 Russell King

 */

#define HAVE_MAP_VID_MEM

#define SAFE_ADDR 0x00000000    /* ROM */

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

{

        static int updated = 0;

        unsigned long address;

        pgd_t *pgd;

        if (updated)

                return 0;

        updated = update;

        address = SCREEN_START | PMD_TYPE_SECT | PMD_DOMAIN(DOMAIN_KERNEL) | PMD_SECT_AP_WRITE;

        pgd = swapper_pg_dir + (SCREEN2_BASE >> PGDIR_SHIFT);

        pgd_val(pgd[0]) = address;

        pgd_val(pgd[1]) = address + (1 << PGDIR_SHIFT);

        if (update) {

                unsigned long pgtable = PAGE_ALIGN(kmem), *p;

                int i;

                memzero ((void *)pgtable, 4096);

                pgd_val(pgd[-2]) = __virt_to_phys(pgtable) | PMD_TYPE_TABLE | PMD_DOMAIN(DOMAIN_KERNEL);

                pgd_val(pgd[-1]) = __virt_to_phys(pgtable + PTRS_PER_PTE*4) | PMD_TYPE_TABLE | PMD_DOMAIN(DOMAIN_KERNEL);

                p = (unsigned long *)pgtable;

                i = PTRS_PER_PTE * 2 - ((SCREEN1_END - log_start) >> PAGE_SHIFT);

                address = SCREEN_START | PTE_TYPE_SMALL | PTE_AP_WRITE;

                while (i < PTRS_PER_PTE * 2) {

                        p[i++] = address;

                        address += PAGE_SIZE;

                }

                flush_page_to_ram(pgtable);

                kmem = pgtable + PAGE_SIZE;

        }

        return kmem;

}