stv0g/metalsvm
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

add support to map kernel pages above 1GB

Browse source
This commit is contained in:
Stefan Lankes 2011-04-08 15:56:28 +02:00
parent ab78beb859
commit 92c5917ef4
1 changed files with 13 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
arch/x86/mm/page.c
View file

@ -87,6 +87,12 @@ inline static size_t copy_page_table(task_t* task, uint32_t pgd_index, page_tabl
for(i=0; i<1024; i++) {
if (pgt->entries[i] & 0xFFFFF000) {
if (!(pgt->entries[i] & PG_USER)) {
// Kernel page => copy only page entries
new_pgt->entries[i] = pgt->entries[i];
continue;
}
phyaddr = get_page();
if (!phyaddr)
continue;
@ -140,9 +146,10 @@ int create_pgd(task_t* task, int copy)
spinlock_lock(&kslock);
for(i=0; i<KERNEL_SPACE/(1024*PAGE_SIZE); i++) {
for(i=0; i<1024; i++) {
pgd->entries[i] = boot_pgd.entries[i];
if (pgd->entries[i])
// only kernel entries will be copied
if (pgd->entries[i] && !(pgd->entries[i] & PG_USER))
pgt->entries[i] = pgt_container->entries[i];
}
@ -165,6 +172,8 @@ int create_pgd(task_t* task, int copy)
for (i=KERNEL_SPACE/(1024*PAGE_SIZE); i<1024; i++) {
if (!(curr_task->pgd->entries[i]))
continue;
if (!(curr_task->pgd->entries[i] & PG_USER))
continue;
phyaddr = copy_page_table(task, i, (page_table_t*) ((KERNEL_SPACE - 1024*PAGE_SIZE + i*PAGE_SIZE) & 0xFFFFF000), &counter);
if (phyaddr) {
@ -194,8 +203,8 @@ int drop_pgd(void)
spinlock_lock(&task->pgd_lock);
for(i=KERNEL_SPACE/(1024*PAGE_SIZE); i<1024; i++) {
if (pgd->entries[i] & 0xFFFFF000) {
for(i=0; i<1024; i++) {
if (pgd->entries[i] & PG_USER) {
put_page(pgd->entries[i] & 0xFFFFF000);
pgd->entries[i] = 0;
}