robin.thoni/ipxe - git rthoni.com

Michael Brown a3b4d6328c [bios] Make uses of REAL_CODE() and PHYS_CODE() 64-bit clean On a 64-bit CPU, any modification of a register by 32-bit or 16-bit code will destroy the invisible upper 32 bits of the corresponding 64-bit register. For example: a 32-bit "pushl %eax" followed by a "popl %eax" will zero the upper half of %rax. This differs from the treatment of upper halves of 32-bit registers by 16-bit code: a "pushw %ax" followed by a "popw %ax" will leave the upper 16 bits of %eax unmodified. Inline assembly generated using REAL_CODE() or PHYS_CODE() will therefore have to preserve the upper halves of all registers, to avoid clobbering registers that gcc expects to be preserved. Output operands from REAL_CODE() and PHYS_CODE() assembly may therefore contain undefined values in the upper 32 bits. Fix by using explicit variable widths (e.g. uint32_t) for non-discarded output operands, to ensure that undefined values in the upper 32 bits of 64-bit registers are ignored. Signed-off-by: Michael Brown <mcb30@ipxe.org>		9 years ago
contrib	[errdb] Strip platform error code for non-platform-generated errors	12 years ago
src	[bios] Make uses of REAL_CODE() and PHYS_CODE() 64-bit clean	9 years ago
COPYING	[legal] Update GPLv2 licence text	10 years ago
COPYING.GPLv2	[legal] Update GPLv2 licence text	10 years ago
COPYING.UBDL	[legal] Add support for the Unmodified Binary Distribution Licence	10 years ago
README	[doc] Re-add README file	15 years ago

iPXE README File

Quick start guide:

   cd src
   make

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