void init_early_pagination (void)
{
unsigned i;
u32 *pd0;
u32 *pt0;
u32 page_it;
pd0 = (u32*)PDBOOT_ADDR;
for (i = 0; i < PD_SIZE; i++)
pd0[i] = P_NULL;
pd0[0] = PTBOOT_ADDR | P_PRESENT | P_WRITABLE;
pt0 = (u32*)PTBOOT_ADDR;
page_it = 0;
for (i = 0; i < PT_SIZE; i++)
{
pt0[i] = page_it | P_PRESENT | P_WRITABLE;
page_it += PAGE_SIZE;
}
SET_PAGE_DIR(PDBOOT_ADDR);
set_cr0(get_cr0() | CR0_PG | CR0_WP);
}
int new_page_tables(struct task_struct * tsk)
{
pgd_t * page_dir, * new_pg;
if (!(new_pg = pgd_alloc()))
return -ENOMEM;
page_dir = pgd_offset(&init_mm, 0);
flush_cache_mm(tsk->mm);
memcpy(new_pg + USER_PTRS_PER_PGD, page_dir + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof (pgd_t));
flush_tlb_mm(tsk->mm);
SET_PAGE_DIR(tsk, new_pg);
tsk->mm->pgd = new_pg;
return 0;
}
static inline void __exit_mm(struct task_struct * tsk)
{
struct mm_struct * mm = tsk->mm;
/* Set us up to use the kernel mm state */
if (mm != &init_mm) {
flush_cache_mm(mm);
flush_tlb_mm(mm);
destroy_context(mm);
tsk->mm = &init_mm;
tsk->swappable = 0;
SET_PAGE_DIR(tsk, swapper_pg_dir);
mm_release();
mmput(mm);
}
}
static inline void __exit_mm(struct task_struct * tsk)
{
struct mm_struct * mm = tsk->mm;
/* Set us up to use the kernel mm state */
if (mm != &init_mm) {
flush_cache_mm(mm);
flush_tlb_mm(mm);
tsk->mm = &init_mm;
tsk->swappable = 0;
SET_PAGE_DIR(tsk, swapper_pg_dir);
/* free the old state - not used any more */
if (!--mm->count) {
exit_mmap(mm);
free_page_tables(mm);
kfree(mm);
}
}
}
