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New UTCB implementation almost working.

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- KIP's pointer to UTCB seems to work with existing l4lib ipc functions.
- Works up to clone()
- In clone we mmap() the same UTCB on each new thread - excessive.
- Generally during page fault handling, cloned threads may fault on the same page
  multiple times even though a single handling would be enough for all of them.
  Need to detect and handle this.
This commit is contained in:
Bahadir Balban
2009-05-01 10:11:47 +03:00
parent 7a81db8782
commit cada0f8f18
31 changed files with 297 additions and 188 deletions
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31
tasks/mm0/src/task.c
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@@ -31,6 +31,7 @@
#include <boot.h>
#include <globals.h>
#include <test.h>
#include <utcb.h>
struct global_list global_tasks = {
.list = { &global_tasks.list, &global_tasks.list },
@@ -86,6 +87,16 @@ struct tcb *tcb_alloc_init(unsigned int flags)
}
task->vm_area_head->tcb_refs = 1;
INIT_LIST_HEAD(&task->vm_area_head->list);
/* Also allocate a utcb head for new address space */
if (!(task->utcb_head =
kzalloc(sizeof(*task->utcb_head)))) {
kfree(task->vm_area_head);
kfree(task);
return PTR_ERR(-ENOMEM);
}
task->utcb_head->tcb_refs = 1;
INIT_LIST_HEAD(&task->utcb_head->list);
}
/* Allocate file structures if not shared */
@@ -93,6 +104,7 @@ struct tcb *tcb_alloc_init(unsigned int flags)
if (!(task->files =
kzalloc(sizeof(*task->files)))) {
kfree(task->vm_area_head);
kfree(task->utcb_head);
kfree(task);
return PTR_ERR(-ENOMEM);
}
@@ -240,15 +252,26 @@ int copy_tcb(struct tcb *to, struct tcb *from, unsigned int flags)
to->map_start = from->map_start;
to->map_end = from->map_end;
/* Sharing the list of vmas */
/* Sharing the list of vmas and utcbs */
if (flags & TCB_SHARED_VM) {
to->vm_area_head = from->vm_area_head;
to->vm_area_head->tcb_refs++;
to->utcb_head = from->utcb_head;
to->utcb_head->tcb_refs++;
} else {
/* Copy all vm areas */
task_copy_vmas(to, from);
/*
* NOTE:
* No copy for utcb descriptor list,
* forker shall start its own unique.
*/
}
/* Set up a new utcb for new thread */
task_setup_utcb(to);
/* Copy all file descriptors */
if (flags & TCB_SHARED_FILES) {
to->files = from->files;
@@ -535,8 +558,9 @@ int task_mmap_segments(struct tcb *task, struct vm_file *file, struct exec_file_
}
/*
* Task already has recycled task's utcb. It will attach to it
* when it starts in userspace.
* Task already has recycled task's shared page. It will attach to it
* when it starts in userspace. Task also already utilizes recycled
* task's utcb.
*/
//if (IS_ERR(shm = shm_new((key_t)task->utcb, __pfn(DEFAULT_UTCB_SIZE))))
// return (int)shm;
@@ -563,6 +587,7 @@ int task_setup_registers(struct tcb *task, unsigned int pc,
exregs_set_stack(&exregs, sp);
exregs_set_pc(&exregs, pc);
exregs_set_pager(&exregs, pager);
exregs_set_utcb(&exregs, task->utcb_address);
if ((err = l4_exchange_registers(&exregs, task->tid)) < 0) {
printf("l4_exchange_registers failed with %d.\n", err);