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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);
}
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