robin.thoni/ipxe - git rthoni.com

Michael Brown ae778091ca [ioapi] Fail ioremap() when attempting to map a zero bus address When a 32-bit iPXE binary is running on a system which allocates PCI memory BARs above 4GB, our PCI subsystem will return the base address for any such BARs as zero (with a warning message if DEBUG=pci is enabled). Currently, ioremap() will happily map an address pointing to the start of physical memory, providing no sensible indication of failure. Fix by always returning NULL if we are asked to ioremap() a zero bus address. With a totally flat memory model (e.g. under EFI), this provides an accurate failure indication since no PCI peripheral will be mapped to the zero bus address. With the librm memory model, there is the possibility of a spurious NULL return from ioremap() if the bus address happens to be equal to virt_offset. Under the current virtual memory map, the NULL virtual address will always be the start of .textdata, and so this problem cannot occur; a NULL return from ioremap() will always be an accurate failure indication. Debugged-by: Anton D. Kachalov <mouse@yandex-team.ru> Signed-off-by: Michael Brown <mcb30@ipxe.org>		10 년 전
contrib	[errdb] Strip platform error code for non-platform-generated errors	11 년 전
src	[ioapi] Fail ioremap() when attempting to map a zero bus address	10 년 전
COPYING	Initial revision	19 년 전
COPYRIGHTS	[build] Rename gPXE to iPXE	14 년 전
README	[doc] Re-add README file	14 년 전

iPXE README File

Quick start guide:

   cd src
   make

For any more detailed instructions, see http://ipxe.org