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charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2021-03-24 8:15 p.m., gaoliming wrote: > Create PR https://github.com/tianocore/edk2/pull/1515 Thanks Liming. Ankur >=20 > Thanks > Liming >> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6----- >> =E5=8F=91=E4=BB=B6=E4=BA=BA: devel@edk2.groups.io =E4=BB=A3=E8=A1=A8 gaoliming >> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B43=E6=9C=8822=E6=97= =A5 9:40 >> =E6=94=B6=E4=BB=B6=E4=BA=BA: 'Ankur Arora' ; = devel@edk2.groups.io >> =E6=8A=84=E9=80=81: 'Michael D Kinney' ; 'L= aszlo Ersek' >> >> =E4=B8=BB=E9=A2=98: [edk2-devel] =E5=9B=9E=E5=A4=8D: [RESEND v2] MdePkg= : use CpuPause() in >> CpuDeadLoop() >> >> Reviewed-by: Liming Gao >> >> Thanks >> Liming >>> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6----- >>> =E5=8F=91=E4=BB=B6=E4=BA=BA: Ankur Arora >>> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B43=E6=9C=8820=E6=97= =A5 2:14 >>> =E6=94=B6=E4=BB=B6=E4=BA=BA: devel@edk2.groups.io >>> =E6=8A=84=E9=80=81: Ankur Arora ; Liming Gao >>> ; Michael D Kinney >>> ; Laszlo Ersek >>> =E4=B8=BB=E9=A2=98: [RESEND v2] MdePkg: use CpuPause() in CpuDeadLoop(= ) >>> >>> CpuPause() might allow the CPU to go into a lower power state >>> state while we spin. >>> >>> On X86, CpuPause() executes a PAUSE instruction which the Intel >>> and AMD specs describe as follows: >>> >>> Intel: >>> "PAUSE: An additional function of the PAUSE instruction is to reduc= e >>> the power consumed by a processor while executing a spin loop. A >>> processor can execute a spin-wait loop extremely quickly, causing t= he >>> processor to consume a lot of power while it waits for the resource= it >>> is spinning on to become available. Inserting a pause instruction i= n a >>> spin-wait loop greatly reduces the processor=E2=80=99s power consum= ption." >>> >>> AMD: >>> "PAUSE: Improves the performance of spin loops, by providing a hint= to >>> the processor that the current code is in a spin loop. The processo= r >>> may use this to optimize power consumption while in the spin loop. >>> Architecturally, this instruction behaves like a NOP instruction." >>> >>> On RISC-V and ARM64, CpuPause() executes a NOP, which is no worse than >>> the tight loop we have. >>> >>> Cc: Liming Gao >>> Signed-off-by: Ankur Arora >>> Reviewed-by: Michael D Kinney >>> Reviewed-by: Laszlo Ersek >>> --- >>> MdePkg/Library/BaseLib/CpuDeadLoop.c | 4 +++- >>> 1 file changed, 3 insertions(+), 1 deletion(-) >>> >>> diff --git a/MdePkg/Library/BaseLib/CpuDeadLoop.c >>> b/MdePkg/Library/BaseLib/CpuDeadLoop.c >>> index 9e110cacbc96..3cd304351a65 100644 >>> --- a/MdePkg/Library/BaseLib/CpuDeadLoop.c >>> +++ b/MdePkg/Library/BaseLib/CpuDeadLoop.c >>> @@ -28,5 +28,7 @@ CpuDeadLoop ( >>> { >>> volatile UINTN Index; >>> >>> - for (Index =3D 0; Index =3D=3D 0;); >>> + for (Index =3D 0; Index =3D=3D 0;) { >>> + CpuPause(); >>> + } >>> } >>> -- >>> 2.9.3 >> >> >> >> >> >>=20 >> >=20 >=20 >=20