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Use reference counting to track filetime of process PD
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This commit is contained in:
Kamil Kowalczyk
2026-01-14 23:11:06 +01:00
parent 270ff507d4
commit 7cd5623d36
6 changed files with 44 additions and 27 deletions
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44
kernel/amd64/proc.c
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@@ -27,9 +27,17 @@ struct proc* proc_from_elf (uint8_t* elf_contents) {
atomic_store (&proc->state, PROC_READY);
proc->pid = atomic_fetch_add (&pids, 1);
proc->pd.lock = SPIN_LOCK_INIT;
proc->pd.cr3_paddr = mm_alloc_user_pd_phys ();
if (proc->pd.cr3_paddr == 0) {
proc->pd = malloc (sizeof (*proc->pd));
if (proc->pd == NULL) {
free (proc);
return NULL;
}
proc->pd->lock = SPIN_LOCK_INIT;
proc->pd->refs = 1;
proc->pd->cr3_paddr = mm_alloc_user_pd_phys ();
if (proc->pd->cr3_paddr == 0) {
free (proc->pd);
free (proc);
return NULL;
}
@@ -39,6 +47,8 @@ struct proc* proc_from_elf (uint8_t* elf_contents) {
struct proc_resource* kstk_r =
proc_create_resource (proc, kstk_rid, PR_MEM, RV_PRIVATE, (void*)&kstk_mem_init);
if (kstk_r == NULL) {
pmm_free (proc->pd->cr3_paddr, 1);
free (proc->pd);
free (proc);
return NULL;
}
@@ -52,6 +62,8 @@ struct proc* proc_from_elf (uint8_t* elf_contents) {
if (ustk_r == NULL) {
kstk_r->ops.cleanup (proc, kstk_r);
free (kstk_r);
pmm_free (proc->pd->cr3_paddr, 1);
free (proc->pd);
free (proc);
return NULL;
}
@@ -78,24 +90,28 @@ void proc_cleanup (struct proc* proc) {
proc_cleanup_resources (proc);
struct list_node_link *mapping_link, *mapping_link_tmp;
spin_lock (&proc->pd.lock, &ctxprpd);
if (atomic_fetch_sub (&proc->pd->refs, 1) == 1) {
DEBUG ("PID %d Free virtual address space\n", proc->pid);
struct list_node_link *mapping_link, *mapping_link_tmp;
spin_lock (&proc->pd->lock, &ctxprpd);
list_foreach (proc->mappings, mapping_link, mapping_link_tmp) {
struct proc_mapping* mapping =
list_entry (mapping_link, struct proc_mapping, proc_mappings_link);
list_foreach (proc->mappings, mapping_link, mapping_link_tmp) {
struct proc_mapping* mapping =
list_entry (mapping_link, struct proc_mapping, proc_mappings_link);
list_remove (proc->mappings, mapping_link);
free (mapping);
list_remove (proc->mappings, mapping_link);
free (mapping);
}
pmm_free (proc->pd->cr3_paddr, 1);
spin_unlock (&proc->pd->lock, &ctxprpd);
free (proc->pd);
}
spin_unlock (&proc->pd.lock, &ctxprpd);
pmm_free (proc->pd.cr3_paddr, 1);
pmm_free (proc->pdata.kernel_stack - (uintptr_t)hhdm->offset - KSTACK_SIZE,
KSTACK_SIZE / PAGE_SIZE);
pmm_free (proc->pdata.user_stack, USTACK_SIZE / PAGE_SIZE);
DEBUG ("PID %d Free stacks\n", proc->pid);
free (proc);
}