Module Name: src Committed By: rin Date: Wed Sep 18 22:29:39 UTC 2024
Modified Files: src/sys/arch/i386/i386: db_interface.c Log Message: i386: DDB: Call x86_pause() (`pause` insn) when CPUs are paused as already done for amd64: https://mail-index.netbsd.org/source-changes/2023/07/31/msg146423.html `pause` insn has been introduced to Pentium 4. However, its opcode is consisted of `nop` (0x90) followed by `rep` prefix (0xf3), and therefore interpreted as `nop` for older processors. Intel assured this behavior [1]. Also note that we already use `pause` unconditionally for i386. Briefly tested on QEMU. [1] Intel, ``AP-949 Using Spin-Loops on Intel Pentium 4 Processor and Intel Xeon Processor'', Version 2.1, Sec 2.1.1. (2001) To generate a diff of this commit: cvs rdiff -u -r1.88 -r1.89 src/sys/arch/i386/i386/db_interface.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.