sambuc/codezero
1
0
Fork 0
mirror of https://github.com/drasko/codezero.git synced 2026-04-17 17:29:04 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

Adding support for refcounted page tables. Fixed freeing of kernel pmds on copy_page_tables

Browse Source
This commit is contained in:
Bahadir Balban
2009-05-02 11:21:19 +03:00
parent 8ab892375e
commit 3acc66c2e7
3 changed files with 17 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
include/l4/generic/tcb.h
View File

@@ -39,6 +39,12 @@ struct task_ids {
l4id_t tgid; l4id_t tgid;
}; };
/* A simple page table with a reference count */
struct address_space {
struct pgd_table_t *pgd;
int ktcb_refs;
};
struct ktcb { struct ktcb {
/* User context */ /* User context */
task_context_t context; task_context_t context;
@@ -86,7 +92,7 @@ struct ktcb {
int nlocks; int nlocks;
/* Page table information */ /* Page table information */
pgd_table_t *pgd; struct address_space *space;
/* Fields for ipc rendezvous */ /* Fields for ipc rendezvous */
struct waitqueue_head wqh_recv; struct waitqueue_head wqh_recv;

6
src/api/thread.c
View File

@@ -256,6 +256,12 @@ int thread_setup_new_ids(struct task_ids *ids, unsigned int flags,
return 0; return 0;
} }
#define KTCB_CREATE_PAGE_TABLES (1 << 0)
/* Allocates a ktcb and page tables depending on flags */
struct ktcb *ktcb_create(unsigned int flags)
{
}
/* /*
* Creates a thread, with a new thread id, and depending on the flags, * Creates a thread, with a new thread id, and depending on the flags,
* either creates a new space, uses the same space as another thread, * either creates a new space, uses the same space as another thread,

6
src/arch/arm/v5/mm.c
View File

@@ -460,9 +460,11 @@ pgd_table_t *copy_page_tables(pgd_table_t *from)
return pgd; return pgd;
out_error: out_error:
/* Find all allocated pmds and free them */ /* Find all allocated non-kernel pmds and free them */
for (int i = 0; i < PGD_ENTRY_TOTAL; i++) { for (int i = 0; i < PGD_ENTRY_TOTAL; i++) {
if ((pgd->entry[i] & PGD_TYPE_MASK) == PGD_TYPE_COARSE) { /* Non-kernel pmd that has just been allocated. */
if (!is_kern_pgdi(i) &&
(pgd->entry[i] & PGD_TYPE_MASK) == PGD_TYPE_COARSE) {
/* Obtain the pmd handle */ /* Obtain the pmd handle */
pmd = (pmd_table_t *) pmd = (pmd_table_t *)
phys_to_virt((pgd->entry[i] & phys_to_virt((pgd->entry[i] &