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/*
* 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;
}
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