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- We do not use latest 4.9.x because it relies on a new version of binutils, while older versions do not. (Note: we should be able to go a bit newer but I didn't bother testing >50 versions to figure this out). - We do not use newer kernel versions because they require one or more of (new perl, new binutils, new make, new gcc, new bison, new tar). - sysb and sysc are updated to use the SATA (libata) subsystem (aka sda) instead of IDE-emulating SATA subsystem (aka hda) which is now available to us. - While theoretically according to docs 4.9 should work OOTB with our version of binutils this is not the case, so we have to do a bit of (interesting) patching. But this does not break anything. - Thankfully serial support in 4.9 is not screwed over like it is in 2.6 so we can revert to that. - 4.9 has the linux-libre project at our disposal, instead of gNewSense. So we use this. Unfortunatley that takes forever because we have to use sed because our version of gawk is too old/buggy. :( I plan to introduce very shortly 1. parallelism 2. 'sysc snapshot' which will start from sysc to avoid this. I do not want to use linux-libre tarballs because they make modificiations directly from this script (aka not easily verifiable, use the source!) and this script allows for much greater flexibility. - We compile the initramfs ahead-of-build using the in-tree cpio generator instead of also building cpio to use less packages. We do NOT build the initramfs into the kernel like 2.6 (unsupported). - Oh and fix a kexec-tools checksum.
34 lines
1.3 KiB
Diff
34 lines
1.3 KiB
Diff
SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
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SPDX-License-Identifier: GPL-2.0-only
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Our older version of binutils dosen't play very nicely with binutils for a
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couple of edgecase macros. It seems that ALTERNATIVE is one of these. As we
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know what your system will be (not Xen), we can manually evaluate and write
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out the ALTERNATIVEs.
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--- arch/x86/entry/entry_32.S 2021-07-31 11:40:07.458032771 +1000
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+++ arch/x86/entry/entry_32.S 2021-07-31 11:40:42.835298841 +1000
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@@ -412,9 +412,8 @@
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movl %esp, %eax
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call do_fast_syscall_32
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- /* XEN PV guests always use IRET path */
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- ALTERNATIVE "testl %eax, %eax; jz .Lsyscall_32_done", \
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- "jmp .Lsyscall_32_done", X86_FEATURE_XENPV
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+ testl %eax, %eax
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+ jz .Lsyscall_32_done
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/* Opportunistic SYSEXIT */
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TRACE_IRQS_ON /* User mode traces as IRQs on. */
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--- arch/x86/entry/vdso/vdso32/system_call.S 2021-07-31 11:41:40.379731622 +1000
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+++ arch/x86/entry/vdso/vdso32/system_call.S 2021-07-31 11:43:40.294633506 +1000
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@@ -55,8 +55,6 @@
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/* If SYSENTER (Intel) or SYSCALL32 (AMD) is available, use it. */
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ALTERNATIVE_2 "", SYSENTER_SEQUENCE, X86_FEATURE_SYSENTER32, \
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SYSCALL_SEQUENCE, X86_FEATURE_SYSCALL32
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-#else
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- ALTERNATIVE "", SYSENTER_SEQUENCE, X86_FEATURE_SEP
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#endif
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/* Enter using int $0x80 */
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