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This patch adds ipc_sendrecv() and opens the way for client/server communication.

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ipc_sendrecv() replaces ipc_sendwait() which was flawed. See ipc_sendrecv() for
how client/server communication works. Tested with page faults where the kernel
does an ipc_sendrecv() to faulty thread's pager and the pager successfully handles
the request, and returns back the result, which effectively restarts the faulty
thread.
This commit is contained in:
Bahadir Balban
2008-02-04 21:03:51 +00:00
parent 13ee470a33
commit 70d5ff33cd
5 changed files with 29 additions and 34 deletions
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13
tasks/mm0/src/fault.c
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@@ -368,10 +368,11 @@ int do_anon_page(struct fault_data *fault)
* - page needs write access:
* action: read the page in, give write access.
*/
void do_page_fault(struct fault_data *fault)
int do_page_fault(struct fault_data *fault)
{
unsigned int vma_flags = (fault->vma) ? fault->vma->flags : VM_NONE;
unsigned int reason = fault->reason;
int err;
/* vma flags show no access */
if (vma_flags & VM_NONE) {
@@ -394,9 +395,15 @@ void do_page_fault(struct fault_data *fault)
/* Handle legitimate read faults on the vma */
if (vma_flags & VMA_ANON)
do_anon_page(fault);
err = do_anon_page(fault);
else
do_file_page(fault);
err = do_file_page(fault);
/* Return the ipc and by doing so restart the faulty thread */
printf("Finished handling fault. Restarting thread by returning.\n");
l4_ipc_return(err);
return 0;
}
void vm_file_pager_read_page(struct fault_data *fault, void *dest_page)