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Cleaner allocation, mapping and prefaulting of utcb shm segments.

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A function has been defined that handles all utcb operations.
This commit is contained in:
Bahadir Balban
2008-10-24 17:20:42 +03:00
parent 46fcdc9b31
commit d43a98b4af
4 changed files with 52 additions and 63 deletions
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28
tasks/mm0/src/task.c
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@@ -444,27 +444,6 @@ struct tcb *task_exec(struct vm_file *f, unsigned long task_region_start,
return task;
}
/* Maps and prefaults the utcb of a task into another task */
void task_map_prefault_utcb(struct tcb *mapper, struct tcb *owner)
{
BUG_ON(!owner->utcb);
/*
* First internally map the utcb as a shm area. We use
* such posix semantics on purpose to have a unified
* way of doing similar operations.
*/
BUG_ON(IS_ERR(shmat_shmget_internal(mapper,
(key_t)owner->utcb,
owner->utcb)));
/* Prefault the owner's utcb to mapper's address space */
for (int i = 0; i < __pfn(DEFAULT_UTCB_SIZE); i++)
prefault_page(mapper, (unsigned long)owner->utcb +
__pfn_to_addr(i), VM_READ | VM_WRITE);
}
/*
* During its initialisation FS0 wants to learn how many boot tasks
* are running, and their tids, which includes itself. This function
@@ -487,12 +466,7 @@ int send_task_data(struct tcb *vfs)
BUG_ON(!vfs->utcb);
/* Attach mm0 to vfs's utcb segment just like a normal task */
BUG_ON(IS_ERR(shmat_shmget_internal(self, (key_t)vfs->utcb, vfs->utcb)));
/* Prefault those pages to self. */
for (int i = 0; i < __pfn(DEFAULT_UTCB_SIZE); i++)
prefault_page(self, (unsigned long)vfs->utcb + __pfn_to_addr(i),
VM_READ | VM_WRITE);
utcb_map_to_task(vfs, self, UTCB_PREFAULT);
/* Write all requested task information to utcb's user buffer area */
tdata_head = (struct task_data_head *)vfs->utcb;