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Comment fix to utcb lazy mapping

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This commit is contained in:
Bahadir Balban
2009-05-22 23:02:40 +03:00
parent 379f7ab2b1
commit d632966778
1 changed files with 8 additions and 3 deletions
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11
src/generic/tcb.c
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@@ -166,9 +166,14 @@ void task_update_utcb(struct ktcb *cur, struct ktcb *next)
} }
/* /*
* Checks whether a task's utcb is currently accessible by the kernel * Checks whether a task's utcb is currently accessible by the kernel.
* It returns an error if its not paged in yet, and also maps a non-current * Returns an error if its not paged in yet, maps a non-current task's
* task's utcb to current task with kernel-access privileges. * utcb to current task for kernel-only access if it is unmapped.
*
* UTCB Mappings: The design is that each task maps its utcb with user
* access, and any other utcb is mapped with kernel-only access privileges
* upon an ipc that requires the kernel to access that utcb, in other
* words foreign utcbs are mapped lazily.
*/ */
int tcb_check_and_lazy_map_utcb(struct ktcb *task) int tcb_check_and_lazy_map_utcb(struct ktcb *task)
{ {