On 01/30/15 09:23, Sergey Isakov wrote: > Dear sirs, > > Sorry for the stupid question, I am not found an explanation. > If an UEFI BIOS loaded additional drivers then how to stop all of them > at OS started? > I may propose that OnExitBootService do this but > DxeMain.c->CoreExitBootServices () does not contain such codes. > So user should do this? > Why DxeMain will not call DisconnectAllControllers?
There's no need to disconnect controllers. Each driver's (and each controller's) handler for the "exiting boot services" event should abort pending / in-flight DMA transfers and such, but otherwise there's no need to release memory individually. If the memory allocations used the correct types throughout boot time, then the OS will repurpose everything it can. Perhaps you're thinking about filesystem drivers with write caching, etc. IIRC, Andrew pointed out already that such drivers are unsafe anyway. Assume you want to reboot or poweroff the machine while at the UEFI shell prompt, or in the boot manager. There's no "controlled shutdown" option that would be usual for an OS, you just reset the system and that's it. The cache would be lost without ever seeing ExitBootServices(). (Corrections / extensions welcome, clearly. :)) Laszlo ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel
