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From: "Andrei Warkentin" <andrei.warkentin@intel.com>
To: Yang Wang <wangyang@bosc.ac.cn>, "devel@edk2.groups.io"
<devel@edk2.groups.io>
CC: Ran Wang <wangran@bosc.ac.cn>, Bamvor Jian ZHANG <zhangjian@bosc.ac.cn>,
"Gao, Liming" <gaoliming@byosoft.com.cn>, "Kinney, Michael D"
<michael.d.kinney@intel.com>, Sunil V L <sunilvl@ventanamicro.com>, "Liu,
Zhiguang" <zhiguang.liu@intel.com>
Subject: Re: [edk2-devel] [PATCH v2] MdePkg/BaseLib:Fix boot DxeCore hang on riscv platform
Thread-Topic: [PATCH v2] MdePkg/BaseLib:Fix boot DxeCore hang on riscv
platform
Thread-Index: AQHaOTm0bZupzCQ12EWpvAImWPEGRrDLafkQ
Date: Fri, 5 Jan 2024 15:47:07 +0000
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References: <63fe1c56bfa5d917d34c6ca9c5d85494385687bb.1703678382.git.wangyang@bosc.ac.cn>
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Looks reasonable to me.
Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com>
> -----Original Message-----
> From: Yang Wang <wangyang@bosc.ac.cn>
> Sent: Wednesday, December 27, 2023 8:57 PM
> To: Warkentin, Andrei <andrei.warkentin@intel.com>; devel@edk2.groups.io
> Cc: Yang Wang <wangyang@bosc.ac.cn>; Ran Wang <wangran@bosc.ac.cn>;
> Bamvor Jian ZHANG <zhangjian@bosc.ac.cn>; Gao, Liming
> <gaoliming@byosoft.com.cn>; Kinney, Michael D
> <michael.d.kinney@intel.com>; Sunil V L <sunilvl@ventanamicro.com>; Liu,
> Zhiguang <zhiguang.liu@intel.com>
> Subject: [PATCH v2] MdePkg/BaseLib:Fix boot DxeCore hang on riscv platfor=
m
>=20
> For scene of
> HandOffToDxeCore()->SwitchStack(DxeCoreEntryPoint)->
> InternalSwitchStack()->LongJump(),Variable HobList.Raw
> will be passed (from *Context1 to register a0) to
> DxeMain() in parameter *HobStart.
>=20
> However, meanwhile the function LongJump() overrides
> register a0 with a1 (-1) due to commit (ea628f28e5 "RISCV: Fix
> InternalLongJump to return correct value"), then cause hang.
>=20
> Replacing calling LongJump() with new InternalSwitchStackAsm() to pass
> addres data in register s0 to register a0 could fix this issue (just
> like the solution in MdePkg/Library/BaseLib/AArch64/SwitchStack.S)
>=20
> Signed-off-by: Yang Wang <wangyang@bosc.ac.cn>
> Reviewed-by: Ran Wang <wangran@bosc.ac.cn>
> Cc: Bamvor Jian ZHANG <zhangjian@bosc.ac.cn>
> Cc: Andrei Warkentin <andrei.warkentin@intel.com>
> Cc: Liming Gao <gaoliming@byosoft.com.cn>
> Cc: Michael D Kinney <michael.d.kinney@intel.com>
> Cc: Sunil V L <sunilvl@ventanamicro.com>
> Cc: Zhiguang Liu <zhiguang.liu@intel.com>
> ---
> Change in v2:
> - Remove JumpBuffer variable parameter
> - Take these in the order of Context1, Context2, EntryPoint, NewS=
tack
> - Fix BaseLib.inf, add Compilation SwitchStack.S
> - Drop REG_S/REG_L
>=20
> MdePkg/Library/BaseLib/BaseLib.inf | 1 +
> .../BaseLib/RiscV64/InternalSwitchStack.c | 31 ++++++++++++----
> MdePkg/Library/BaseLib/RiscV64/SwitchStack.S | 37
> +++++++++++++++++++
> 3 files changed, 62 insertions(+), 7 deletions(-)
> create mode 100644 MdePkg/Library/BaseLib/RiscV64/SwitchStack.S
>=20
> diff --git a/MdePkg/Library/BaseLib/BaseLib.inf
> b/MdePkg/Library/BaseLib/BaseLib.inf
> index 5338938944..6b46949be3 100644
> --- a/MdePkg/Library/BaseLib/BaseLib.inf
> +++ b/MdePkg/Library/BaseLib/BaseLib.inf
> @@ -397,6 +397,7 @@
> RiscV64/CpuPause.c
>=20
> RiscV64/MemoryFence.S | GCC
>=20
> RiscV64/RiscVSetJumpLongJump.S | GCC
>=20
> + RiscV64/SwitchStack.S | GCC
>=20
> RiscV64/RiscVCpuBreakpoint.S | GCC
>=20
> RiscV64/RiscVCpuPause.S | GCC
>=20
> RiscV64/RiscVInterrupt.S | GCC
>=20
> diff --git a/MdePkg/Library/BaseLib/RiscV64/InternalSwitchStack.c
> b/MdePkg/Library/BaseLib/RiscV64/InternalSwitchStack.c
> index b78424c163..3216d241ad 100644
> --- a/MdePkg/Library/BaseLib/RiscV64/InternalSwitchStack.c
> +++ b/MdePkg/Library/BaseLib/RiscV64/InternalSwitchStack.c
> @@ -8,6 +8,29 @@
>=20
>=20
> #include "BaseLibInternals.h"
>=20
>=20
>=20
> +/**
>=20
> + Transfers control to a function starting with a new stack.
>=20
> +
>=20
> + This internal worker function transfers control to the function
>=20
> + specified by EntryPoint using the new stack specified by NewStack,
>=20
> + and passes in the parameters specified by Context1 and Context2.
>=20
> + Context1 and Context2 are optional and may be NULL.
>=20
> + The function EntryPoint must never return.
>=20
> +
>=20
> + @param Context1 The first parameter to pass in.
>=20
> + @param Context2 The second Parameter to pass in
>=20
> + @param EntryPoint The pointer to the function to enter.
>=20
> + @param NewStack The new Location of the stack
>=20
> +
>=20
> +**/
>=20
> +VOID
>=20
> +EFIAPI
>=20
> +InternalSwitchStackAsm (
>=20
> + IN VOID *Context1 OPTIONAL,
>=20
> + IN VOID *Context2 OPTIONAL,
>=20
> + IN SWITCH_STACK_ENTRY_POINT EntryPoint,
>=20
> + IN VOID *NewStack
>=20
> + );
>=20
> /**
>=20
> Transfers control to a function starting with a new stack.
>=20
>=20
>=20
> @@ -42,12 +65,6 @@ InternalSwitchStack (
> IN VA_LIST Marker
>=20
> )
>=20
> {
>=20
> - BASE_LIBRARY_JUMP_BUFFER JumpBuffer;
>=20
> -
>=20
> - JumpBuffer.RA =3D (UINTN)EntryPoint;
>=20
> - JumpBuffer.SP =3D (UINTN)NewStack - sizeof (VOID *);
>=20
> - JumpBuffer.S0 =3D (UINT64)(UINTN)Context1;
>=20
> - JumpBuffer.S1 =3D (UINT64)(UINTN)Context2;
>=20
> - LongJump (&JumpBuffer, (UINTN)-1);
>=20
> + InternalSwitchStackAsm (Context1, Context2, EntryPoint, (VOID
> *)((UINTN)NewStack - sizeof (VOID *)));
>=20
> ASSERT (FALSE);
>=20
> }
>=20
> diff --git a/MdePkg/Library/BaseLib/RiscV64/SwitchStack.S
> b/MdePkg/Library/BaseLib/RiscV64/SwitchStack.S
> new file mode 100644
> index 0000000000..db535c1aab
> --- /dev/null
> +++ b/MdePkg/Library/BaseLib/RiscV64/SwitchStack.S
> @@ -0,0 +1,37 @@
> +//----------------------------------------------------------------------=
--------
>=20
> +//
>=20
> +// InternalSwitchStackAsm for RISC-V
>=20
> +//
>=20
> +// Copyright (c) 2023, Bosc Corporation. All rights reserved.<BR>
>=20
> +//
>=20
> +// SPDX-License-Identifier: BSD-2-Clause-Patent
>=20
> +//
>=20
> +//----------------------------------------------------------------------=
--------
>=20
> +.align 3
>=20
> +
>=20
> +#/**
>=20
> +#
>=20
> +# This allows the caller to switch the stack and goes to the new entry p=
oint
>=20
> +#
>=20
> +# @param Context Parameter to pass in
>=20
> +# @param Context2 Parameter2 to pass in
>=20
> +# @param EntryPoint The pointer to the location to enter
>=20
> +# @param NewStack New Location of the stack
>=20
> +#
>=20
> +# @return Nothing. Goes to the Entry Point passing in the new parame=
ters
>=20
> +#
>=20
> +#**/
>=20
> +#VOID
>=20
> +#EFIAPI
>=20
> +#InternalSwitchStackAsm (
>=20
> +# VOID *Context,
>=20
> +# VOID *Context2,
>=20
> +# SWITCH_STACK_ENTRY_POINT EntryPoint,
>=20
> +# VOID *NewStack
>=20
> +# );
>=20
> +#
>=20
> + .globl InternalSwitchStackAsm
>=20
> +InternalSwitchStackAsm:
>=20
> + mv ra, a2
>=20
> + mv sp, a3
>=20
> + ret
>=20
> --
> 2.25.1
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