openslx-ng/ipxe.git/src/arch/x86_64/include/bits, branch master

[build] Prevent use of MMX and SSE registers

2018-03-20T20:01:08+00:00

The existence of MMX and SSE is required by the System V x86_64 ABI and so is assumed by gcc, but these registers are not preserved by our own interrupt handlers and are unlikely to be preserved by other context switch handlers in a boot firmware environment. Explicitly prevent gcc from using MMX or SSE registers to avoid potential problems due to silent register corruption. We must remove the %xmm0-%xmm5 clobbers from the x86_64 version of hv_call() since otherwise gcc will complain about unknown register names. Theoretically, we should probably add code to explicitly preserve the %xmm0-%xmm5 registers across a hypercall, in order to guarantee to external code that these registers remain unchanged. In practice this is difficult since SSE registers are disabled by default: for background information see commits 71560d1 ("[librm] Preserve FPU, MMX and SSE state across calls to virt_call()") and dd9a14d ("[librm] Conditionalize the workaround for the Tivoli VMM's SSE garbling"). Signed-off-by: Michael Brown

[legal] Add missing FILE_LICENCE declarations

2017-12-29T11:57:00+00:00

Add missing FILE_LICENCE declarations to x86_64 headers based on the corresponding i386 headers (from which the x86_64 headers were originally derived). Signed-off-by: Michael Brown

[hyperv] Use generic set_bit() function

2016-03-16T22:33:41+00:00

Signed-off-by: Michael Brown

[librm] Provide an abstraction wrapper for prot_call

2016-02-18T23:23:38+00:00

Signed-off-by: Michael Brown

[bios] Add bin-x86_64-pcbios build platform

2016-02-16T19:32:32+00:00

Move most arch/i386 files to arch/x86, and adjust the contents of the Makefiles and the include/bits/*.h headers to reflect the new locations. This patch makes no substantive code changes, as can be seen using a rename-aware diff (e.g. "git show -M5"). This patch does not make the pcbios platform functional for x86_64; it merely allows it to compile without errors. Signed-off-by: Michael Brown

[libc] Add ffs(), ffsl(), and ffsll()

2015-03-16T15:40:53+00:00

Signed-off-by: Michael Brown

[build] Fix the REQUIRE_SYMBOL mechanism

2015-03-05T00:59:38+00:00

At some point in the past few years, binutils became more aggressive at removing unused symbols. To function as a symbol requirement, a relocation record must now be in a section marked with @progbits and must not be in a section which gets discarded during the link (either via --gc-sections or via /DISCARD/). Update REQUIRE_SYMBOL() to generate relocation records meeting these criteria. To minimise the impact upon the final binary size, we use existing symbols (specified via the REQUIRING_SYMBOL() macro) as the relocation targets where possible. We use R_386_NONE or R_X86_64_NONE relocation types to prevent any actual unwanted relocation taking place. Where no suitable symbol exists for REQUIRING_SYMBOL() (such as in config.c), the macro PROVIDE_REQUIRING_SYMBOL() can be used to generate a one-byte-long symbol to act as the relocation target. If there are versions of binutils for which this approach fails, then the fallback will probably involve killing off REQUEST_SYMBOL(), redefining REQUIRE_SYMBOL() to use the current definition of REQUEST_SYMBOL(), and postprocessing the linked ELF file with something along the lines of "nm -u | wc -l" to check that there are no undefined symbols remaining. Signed-off-by: Michael Brown

[libc] Rewrite byte-swapping code

2015-03-02T16:35:37+00:00

Signed-off-by: Michael Brown

[legal] Relicense files under GPL2_OR_LATER_OR_UBDL

2015-03-02T14:17:31+00:00

Relicense files for which I am the sole author (as identified by util/relicense.pl). Signed-off-by: Michael Brown

[hyperv] Add support for Hyper-V hypervisor

2014-12-18T16:27:27+00:00

Add support for detecting and communicating with the Hyper-V hypervisor. Signed-off-by: Michael Brown