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This commit is contained in:
Bahadir Balban
2009-11-01 01:36:03 +02:00
parent 5fd0f12017
commit 003976e99e
1 changed files with 8 additions and 38 deletions
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46
src/generic/tcb.c
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@@ -203,12 +203,14 @@ int tcb_check_and_lazy_map_utcb(struct ktcb *task)
BUG_ON(!task->utcb_address);
/*
* There you go:
*
* if task == current && not mapped, page-in, if not return -EFAULT
* if task != current && not mapped, return -EFAULT since can't page-in on behalf of it.
* if task != current && task mapped, but mapped != current mapped, map it, return 0
* if task != current && task mapped, but mapped == current mapped, return 0
* If task == current && not mapped,
* page-in, if not return -EFAULT
* If task != current && not mapped,
* return -EFAULT since can't page-in on behalf of it.
* If task != current && task mapped,
* but mapped != current mapped, map it, return 0
* If task != current && task mapped,
* but mapped == current mapped, return 0
*/
if (current == task) {
@@ -248,38 +250,6 @@ int tcb_check_and_lazy_map_utcb(struct ktcb *task)
BUG_ON(!phys);
}
}
#if 0
/*
* FIXME:
*
* A task may have the utcb mapping of a destroyed thread
* at the given virtual address. This would silently be accepted
* as *mapped*. We need to ensure utcbs of destroyed tasks
* are cleared from all other task's page tables.
*/
if ((ret = check_access(task->utcb_address, UTCB_SIZE,
MAP_SVC_RW_FLAGS, 0)) < 0) {
/* Current task simply hasn't mapped its utcb */
if (task == current) {
return -EFAULT;
} else {
if (!(phys = virt_to_phys_by_pgd(task->utcb_address,
TASK_PGD(task)))) {
/* Task hasn't mapped its utcb */
return -EFAULT;
} else {
/*
* Task has utcb but it hasn't yet been mapped
* to current task with kernel access. Do it.
*/
add_mapping_pgd(phys, task->utcb_address,
page_align_up(UTCB_SIZE),
MAP_SVC_RW_FLAGS,
TASK_PGD(current));
}
}
}
#endif
return 0;
}