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vm: implement private and shared address space mappings

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whether a mapping is private or shared determines how the mapping is handled
when a task is duplicated.
This commit is contained in:
max 🍓
2026-04-21 21:12:00 +01:00
parent 8b7382fa13
commit 278fe39c0d
9 changed files with 63 additions and 24 deletions
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syscall/address-space.c
+11 -9
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@@ -125,6 +125,7 @@ kern_status_t sys_address_space_map(
kern_handle_t object_handle,
off_t object_offset,
size_t length,
vm_flags_t flags,
vm_prot_t prot,
virt_addr_t *out_base_address)
{
@@ -140,8 +141,8 @@ kern_status_t sys_address_space_map(
}
kern_status_t status = KERN_OK;
unsigned long flags;
task_lock_irqsave(self, &flags);
unsigned long irq_flags;
task_lock_irqsave(self, &irq_flags);
struct object *region_obj = NULL, *vmo_obj = NULL;
handle_flags_t region_flags = 0, vmo_flags = 0;
@@ -151,34 +152,34 @@ kern_status_t sys_address_space_map(
&region_obj,
&region_flags);
if (status != KERN_OK) {
task_unlock_irqrestore(self, flags);
task_unlock_irqrestore(self, irq_flags);
put_current_task(self);
return status;
}
status = task_resolve_handle(self, object_handle, &vmo_obj, &vmo_flags);
if (status != KERN_OK) {
task_unlock_irqrestore(self, flags);
task_unlock_irqrestore(self, irq_flags);
put_current_task(self);
return status;
}
struct address_space *region = address_space_cast(region_obj);
if (!region) {
task_unlock_irqrestore(self, flags);
task_unlock_irqrestore(self, irq_flags);
put_current_task(self);
return KERN_INVALID_ARGUMENT;
}
struct vm_object *vmo = vm_object_cast(vmo_obj);
if (!vmo) {
task_unlock_irqrestore(self, flags);
task_unlock_irqrestore(self, irq_flags);
put_current_task(self);
return KERN_INVALID_ARGUMENT;
}
task_unlock_irqrestore(self, flags);
address_space_lock_irqsave(region, &flags);
task_unlock_irqrestore(self, irq_flags);
address_space_lock_irqsave(region, &irq_flags);
/* address_space_map will take care of locking `vmo` */
status = address_space_map(
region,
@@ -186,9 +187,10 @@ kern_status_t sys_address_space_map(
vmo,
object_offset,
length,
flags,
prot,
out_base_address);
address_space_unlock_irqrestore(region, flags);
address_space_unlock_irqrestore(region, irq_flags);
object_unref(vmo_obj);
object_unref(region_obj);