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| author | Ian Moffett <ian@osmora.org> | 2024-02-14 18:26:47 -0500 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2024-02-14 18:26:47 -0500 |
| commit | 2440a9d67b0785132e303ed6f12dff8e80baa547 (patch) | |
| tree | f4a2d3dd72361814db4c2f240c713255e437fd5e /sys/include/arch/amd64/cpu.h | |
| parent | 34d83987c18df3e06db1528423841376072bb627 (diff) | |
kernel: cpu: Add hint_spinwait()
This commit introduces a macro that must exist per
architecture (even if it does nothing) to ensure it is
machine independent.
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'sys/include/arch/amd64/cpu.h')
| -rw-r--r-- | sys/include/arch/amd64/cpu.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/include/arch/amd64/cpu.h b/sys/include/arch/amd64/cpu.h index c72c106..e6f2de0 100644 --- a/sys/include/arch/amd64/cpu.h +++ b/sys/include/arch/amd64/cpu.h @@ -37,6 +37,13 @@ #include <sys/queue.h> #include <machine/tss.h> #include <machine/msr.h> +/* + * XXX: We are not using the PAUSE instruction for the sake of + * ensuring compatibility... PAUSE is F3 90, REP NOP is + * F3 90... REP NOP will be read as a PAUSE on processors + * that support it. + */ +#define hint_spinwait() __ASMV("rep; nop") #define this_cpu() amd64_this_cpu() #define get_bsp() amd64_get_bsp() |