Searched hist:127411 (Results 1 - 2 of 2) sorted by relevance
| /freebsd-11-stable/sys/compat/ndis/ | ||
| H A D | subr_ndis.c | diff 127411 Thu Mar 25 16:31:52 MST 2004 wpaul - In subr_ndis.c:ndis_init_event(), initialize events as notification objects rather than synchronization objects. When a sync object is signaled, only the first thread waiting on it is woken up, and then it's automatically reset to the not-signaled state. When a notification object is signaled, all threads waiting on it will be woken up, and it remains in the signaled state until someone resets it manually. We want the latter behavior for NDIS events. - In kern_ndis.c:ndis_convert_res(), we have to create a temporary copy of the list returned by BUS_GET_RESOURCE_LIST(). When the PCI bus code probes resources for a given device, it enters them into a singly linked list, head first. The result is that traversing this list gives you the resources in reverse order. This means when we create the Windows resource list, it will be in reverse order too. Unfortunately, this can hose drivers for devices with multiple I/O ranges of the same type, like, say, two memory mapped I/O regions (one for registers, one to map the NVRAM/bootrom/whatever). Some drivers test the range size to figure out which region is which, but others just assume that the resources will be listed in ascending order from lowest numbered BAR to highest. Reversing the order means such drivers will choose the wrong resource as their I/O register range. Since we can't traverse the resource SLIST backwards, we have to make a temporary copy of the list in the right order and then build the Windows resource list from that. I suppose we could just fix the PCI bus code to use a TAILQ instead, but then I'd have to track down all the consumers of the BUS_GET_RESOURCE_LIST() and fix them too. |
| H A D | kern_ndis.c | diff 127411 Thu Mar 25 16:31:52 MST 2004 wpaul - In subr_ndis.c:ndis_init_event(), initialize events as notification objects rather than synchronization objects. When a sync object is signaled, only the first thread waiting on it is woken up, and then it's automatically reset to the not-signaled state. When a notification object is signaled, all threads waiting on it will be woken up, and it remains in the signaled state until someone resets it manually. We want the latter behavior for NDIS events. - In kern_ndis.c:ndis_convert_res(), we have to create a temporary copy of the list returned by BUS_GET_RESOURCE_LIST(). When the PCI bus code probes resources for a given device, it enters them into a singly linked list, head first. The result is that traversing this list gives you the resources in reverse order. This means when we create the Windows resource list, it will be in reverse order too. Unfortunately, this can hose drivers for devices with multiple I/O ranges of the same type, like, say, two memory mapped I/O regions (one for registers, one to map the NVRAM/bootrom/whatever). Some drivers test the range size to figure out which region is which, but others just assume that the resources will be listed in ascending order from lowest numbered BAR to highest. Reversing the order means such drivers will choose the wrong resource as their I/O register range. Since we can't traverse the resource SLIST backwards, we have to make a temporary copy of the list in the right order and then build the Windows resource list from that. I suppose we could just fix the PCI bus code to use a TAILQ instead, but then I'd have to track down all the consumers of the BUS_GET_RESOURCE_LIST() and fix them too. |
Completed in 77 milliseconds