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/*
* arch/arm/mm/mm-arc.c
*
* Extra MM routines for the Archimedes architecture
*
* Copyright (C) 1998 Russell King
*/
#include <linux/init.h>
#include <asm/hardware.h>
#include <asm/pgtable.h>
unsigned long phys_screen_end;
/*
* This routine needs more work to make it dynamically release/allocate mem!
*/
__initfunc(unsigned long map_screen_mem(unsigned long log_start, unsigned long kmem, int update))
{
static int updated = 0;
if (updated)
return 0;
updated = update;
if (update) {
unsigned long address = log_start, offset;
pgd_t *pgdp;
kmem = (kmem + 3) & ~3;
pgdp = pgd_offset (&init_mm, address); /* +31 */
offset = SCREEN_START;
while (address < SCREEN1_END) {
unsigned long addr_pmd, end_pmd;
pmd_t *pmdp;
/* if (pgd_none (*pgdp)) alloc pmd */
pmdp = pmd_offset (pgdp, address); /* +0 */
addr_pmd = address & ~PGDIR_MASK; /* 088000 */
end_pmd = addr_pmd + SCREEN1_END - address; /* 100000 */
if (end_pmd > PGDIR_SIZE)
end_pmd = PGDIR_SIZE;
do {
unsigned long addr_pte, end_pte;
pte_t *ptep;
if (pmd_none (*pmdp)) {
pte_t *new_pte = (pte_t *)kmem;
kmem += PTRS_PER_PTE * BYTES_PER_PTR;
memzero (new_pte, PTRS_PER_PTE * BYTES_PER_PTR);
set_pmd (pmdp, mk_pmd(new_pte));
}
ptep = pte_offset (pmdp, addr_pmd); /* +11 */
addr_pte = addr_pmd & ~PMD_MASK; /* 088000 */
end_pte = addr_pte + end_pmd - addr_pmd; /* 100000 */
if (end_pte > PMD_SIZE)
end_pte = PMD_SIZE;
do {
set_pte (ptep, mk_pte(offset, PAGE_KERNEL));
addr_pte += PAGE_SIZE;
offset += PAGE_SIZE;
ptep++;
} while (addr_pte < end_pte);
pmdp++;
addr_pmd = (addr_pmd + PMD_SIZE) & PMD_MASK;
} while (addr_pmd < end_pmd);
address = (address + PGDIR_SIZE) & PGDIR_MASK;
pgdp ++;
}
phys_screen_end = offset;
flush_tlb_all ();
update_memc_all ();
}
return kmem;
}
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