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vm: implement demand-paging via userspace services with vm-controller

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This commit is contained in:
max 🍓
2026-03-14 22:39:14 +00:00
parent f04c524bb5
commit 0af35c70ef
12 changed files with 826 additions and 100 deletions
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32
include/kernel/vm-object.h
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@@ -6,10 +6,27 @@
#define VM_OBJECT_NAME_MAX 64
struct vm_controller;
enum vm_object_flags {
/* the memory behind this vm-object wasn't allocated by us, and
* therefore shouldn't be freed by us */
VMO_IN_PLACE = 0x01u,
/* this vm-object is/was attached to a vm-controller */
VMO_CONTROLLER = 0x02u,
/* these flags are for use with vm_object_get_page */
/**************************************************/
/* if the relevant page hasn't been allocated yet, it will be allocated
* and returned. if this flag isn't specified, NULL will be returned. */
VMO_ALLOCATE_MISSING_PAGE = 0x04u,
/* if the vm-object is attached to a vm-controller, and the relevant
* page is uncommitted, send a request to the vm-controller to provide
* the missing page. will result in the vm-object being unlocked and
* the current thread sleeping until the request is fulfilled. the
* vm-object will be re-locked before the function returns. */
VMO_REQUEST_MISSING_PAGE = 0x08u,
};
struct vm_object {
@@ -21,8 +38,12 @@ struct vm_object {
/* queue of struct vm_region_mapping */
struct queue vo_mappings;
/* memory protection flags. mappings of this vm_object can only use
* a subset of the flags set in this mask. */
struct vm_controller *vo_ctrl;
equeue_key_t vo_key;
struct btree_node vo_ctrl_node;
/* memory protection flags. mappings of this vm_object can only
* use a subset of the flags set in this mask. */
vm_prot_t vo_prot;
/* btree of vm_pages that have been allocated to this vm_object.
@@ -58,13 +79,10 @@ extern struct vm_object *vm_object_create_in_place(
vm_prot_t prot);
extern struct vm_page *vm_object_get_page(
const struct vm_object *vo,
off_t offset);
extern struct vm_page *vm_object_alloc_page(
struct vm_object *vo,
off_t offset,
enum vm_page_order size);
enum vm_object_flags flags,
unsigned long *irq_flags);
extern kern_status_t vm_object_read(
struct vm_object *vo,