[edk2-devel] [PATCH v1 23/34] MdePkg/BaseLib: BaseLib for LOONGARCH64 architecture.
Chao Li
lichao at loongson.cn
Sun Sep 11 04:17:23 UTC 2022
Hi Mike,
I will check and try it.
Thanks,
Chao
> -----原始邮件-----
> 发件人: "Michael D Kinney" <michael.d.kinney at intel.com>
> 发送时间:2022-09-10 01:20:37 (星期六)
> 收件人: "Chao Li" <lichao at loongson.cn>, "devel at edk2.groups.io" <devel at edk2.groups.io>, "Kinney, Michael D" <michael.d.kinney at intel.com>
> 抄送: "Gao, Liming" <gaoliming at byosoft.com.cn>, "Liu, Zhiguang" <zhiguang.liu at intel.com>, "Baoqi Zhang" <zhangbaoqi at loongson.cn>
> 主题: Re: [edk2-devel] [PATCH v1 23/34] MdePkg/BaseLib: BaseLib for LOONGARCH64 architecture.
>
> For unaligned read/write functions, can you use one of the other BaseLib source files
> that already provides a generic implementation?
>
> Mike
>
> > -----Original Message-----
> > From: Chao Li <lichao at loongson.cn>
> > Sent: Wednesday, September 7, 2022 9:52 PM
> > To: devel at edk2.groups.io
> > Cc: Kinney, Michael D <michael.d.kinney at intel.com>; Gao, Liming <gaoliming at byosoft.com.cn>; Liu, Zhiguang
> > <zhiguang.liu at intel.com>; Baoqi Zhang <zhangbaoqi at loongson.cn>
> > Subject: [PATCH v1 23/34] MdePkg/BaseLib: BaseLib for LOONGARCH64 architecture.
> >
> > Add LoongArch LOONGARCH64 BaseLib functions.
> >
> > Cc: Michael D Kinney <michael.d.kinney at intel.com>
> > Cc: Liming Gao <gaoliming at byosoft.com.cn>
> > Cc: Zhiguang Liu <zhiguang.liu at intel.com>
> >
> > Signed-off-by: Chao Li <lichao at loongson.cn>
> > Co-authored-by: Baoqi Zhang <zhangbaoqi at loongson.cn>
> > ---
> > MdePkg/Include/Library/BaseLib.h | 24 ++
> > MdePkg/Library/BaseLib/BaseLib.inf | 13 +
> > .../BaseLib/LoongArch64/CpuBreakpoint.S | 24 ++
> > MdePkg/Library/BaseLib/LoongArch64/CpuPause.S | 31 +++
> > .../BaseLib/LoongArch64/DisableInterrupts.S | 21 ++
> > .../BaseLib/LoongArch64/EnableInterrupts.S | 21 ++
> > .../BaseLib/LoongArch64/GetInterruptState.S | 35 +++
> > .../BaseLib/LoongArch64/InternalSwitchStack.c | 58 +++++
> > .../Library/BaseLib/LoongArch64/MemoryFence.S | 19 ++
> > .../BaseLib/LoongArch64/SetJumpLongJump.S | 49 ++++
> > .../Library/BaseLib/LoongArch64/SwitchStack.S | 39 +++
> > .../Library/BaseLib/LoongArch64/Unaligned.c | 242 ++++++++++++++++++
> > 12 files changed, 576 insertions(+)
> > create mode 100644 MdePkg/Library/BaseLib/LoongArch64/CpuBreakpoint.S
> > create mode 100644 MdePkg/Library/BaseLib/LoongArch64/CpuPause.S
> > create mode 100644 MdePkg/Library/BaseLib/LoongArch64/DisableInterrupts.S
> > create mode 100644 MdePkg/Library/BaseLib/LoongArch64/EnableInterrupts.S
> > create mode 100644 MdePkg/Library/BaseLib/LoongArch64/GetInterruptState.S
> > create mode 100644 MdePkg/Library/BaseLib/LoongArch64/InternalSwitchStack.c
> > create mode 100644 MdePkg/Library/BaseLib/LoongArch64/MemoryFence.S
> > create mode 100644 MdePkg/Library/BaseLib/LoongArch64/SetJumpLongJump.S
> > create mode 100644 MdePkg/Library/BaseLib/LoongArch64/SwitchStack.S
> > create mode 100644 MdePkg/Library/BaseLib/LoongArch64/Unaligned.c
> >
> > diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h
> > index a6f9a194ef..f3f59f21c2 100644
> > --- a/MdePkg/Include/Library/BaseLib.h
> > +++ b/MdePkg/Include/Library/BaseLib.h
> > @@ -6,6 +6,7 @@ Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>
> > Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
> >
> > Copyright (c) Microsoft Corporation.<BR>
> >
> > Portions Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
> >
> > +Portions Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
> >
> >
> >
> > SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> >
> >
> > @@ -152,6 +153,29 @@ typedef struct {
> >
> >
> > #endif // defined (MDE_CPU_RISCV64)
> >
> >
> >
> > +#if defined (MDE_CPU_LOONGARCH64)
> >
> > +///
> >
> > +/// The LoongArch architecture context buffer used by SetJump() and LongJump()
> >
> > +///
> >
> > +typedef struct {
> >
> > + UINT64 S0;
> >
> > + UINT64 S1;
> >
> > + UINT64 S2;
> >
> > + UINT64 S3;
> >
> > + UINT64 S4;
> >
> > + UINT64 S5;
> >
> > + UINT64 S6;
> >
> > + UINT64 S7;
> >
> > + UINT64 S8;
> >
> > + UINT64 SP;
> >
> > + UINT64 FP;
> >
> > + UINT64 RA;
> >
> > +} BASE_LIBRARY_JUMP_BUFFER;
> >
> > +
> >
> > +#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 8
> >
> > +
> >
> > +#endif // defined (MDE_CPU_LOONGARCH64)
> >
> > +
> >
> > //
> >
> > // String Services
> >
> > //
> >
> > diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
> > index 6be5be9428..86de3ae7cd 100644
> > --- a/MdePkg/Library/BaseLib/BaseLib.inf
> > +++ b/MdePkg/Library/BaseLib/BaseLib.inf
> > @@ -402,6 +402,19 @@
> > RiscV64/RiscVInterrupt.S | GCC
> >
> > RiscV64/FlushCache.S | GCC
> >
> >
> >
> > +[Sources.LOONGARCH64]
> >
> > + Math64.c
> >
> > + LoongArch64/Unaligned.c
> >
> > + LoongArch64/InternalSwitchStack.c
> >
> > + LoongArch64/GetInterruptState.S | GCC
> >
> > + LoongArch64/EnableInterrupts.S | GCC
> >
> > + LoongArch64/DisableInterrupts.S | GCC
> >
> > + LoongArch64/MemoryFence.S | GCC
> >
> > + LoongArch64/CpuBreakpoint.S | GCC
> >
> > + LoongArch64/CpuPause.S | GCC
> >
> > + LoongArch64/SetJumpLongJump.S | GCC
> >
> > + LoongArch64/SwitchStack.S | GCC
> >
> > +
> >
> > [Packages]
> >
> > MdePkg/MdePkg.dec
> >
> >
> >
> > diff --git a/MdePkg/Library/BaseLib/LoongArch64/CpuBreakpoint.S b/MdePkg/Library/BaseLib/LoongArch64/CpuBreakpoint.S
> > new file mode 100644
> > index 0000000000..4e022e9bb5
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseLib/LoongArch64/CpuBreakpoint.S
> > @@ -0,0 +1,24 @@
> > +#------------------------------------------------------------------------------
> >
> > +#
> >
> > +# CpuBreakpoint for LoongArch
> >
> > +#
> >
> > +# Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
> >
> > +#
> >
> > +# SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> > +#
> >
> > +#------------------------------------------------------------------------------
> >
> > +
> >
> > +ASM_GLOBAL ASM_PFX(CpuBreakpoint)
> >
> > +
> >
> > +#/**
> >
> > +# Generates a breakpoint on the CPU.
> >
> > +#
> >
> > +# Generates a breakpoint on the CPU. The breakpoint must be implemented such
> >
> > +# that code can resume normal execution after the breakpoint.
> >
> > +#
> >
> > +#**/
> >
> > +
> >
> > +ASM_PFX(CpuBreakpoint):
> >
> > + break 3
> >
> > + jirl $zero, $ra, 0
> >
> > + .end
> >
> > diff --git a/MdePkg/Library/BaseLib/LoongArch64/CpuPause.S b/MdePkg/Library/BaseLib/LoongArch64/CpuPause.S
> > new file mode 100644
> > index 0000000000..e9140e8742
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseLib/LoongArch64/CpuPause.S
> > @@ -0,0 +1,31 @@
> > +#------------------------------------------------------------------------------
> >
> > +#
> >
> > +# CpuPause for LoongArch
> >
> > +#
> >
> > +# Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
> >
> > +#
> >
> > +# SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> > +#
> >
> > +#------------------------------------------------------------------------------
> >
> > +
> >
> > +ASM_GLOBAL ASM_PFX(CpuPause)
> >
> > +
> >
> > +#/**
> >
> > +# Requests CPU to pause for a short period of time.
> >
> > +#
> >
> > +# Requests CPU to pause for a short period of time. Typically used in MP
> >
> > +# systems to prevent memory starvation while waiting for a spin lock.
> >
> > +#
> >
> > +#**/
> >
> > +
> >
> > +ASM_PFX(CpuPause):
> >
> > + nop
> >
> > + nop
> >
> > + nop
> >
> > + nop
> >
> > + nop
> >
> > + nop
> >
> > + nop
> >
> > + nop
> >
> > + jirl $zero, $ra, 0
> >
> > + .end
> >
> > diff --git a/MdePkg/Library/BaseLib/LoongArch64/DisableInterrupts.S b/MdePkg/Library/BaseLib/LoongArch64/DisableInterrupts.S
> > new file mode 100644
> > index 0000000000..0f228339af
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseLib/LoongArch64/DisableInterrupts.S
> > @@ -0,0 +1,21 @@
> > +#------------------------------------------------------------------------------
> >
> > +#
> >
> > +# LoongArch interrupt disable
> >
> > +#
> >
> > +# Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
> >
> > +#
> >
> > +# SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> > +#
> >
> > +#------------------------------------------------------------------------------
> >
> > +
> >
> > +ASM_GLOBAL ASM_PFX(DisableInterrupts)
> >
> > +
> >
> > +#/**
> >
> > +# Disables CPU interrupts.
> >
> > +#**/
> >
> > +
> >
> > +ASM_PFX(DisableInterrupts):
> >
> > + li.w $t0, 0x4
> >
> > + csrxchg $zero, $t0, 0x0
> >
> > + jirl $zero, $ra, 0
> >
> > + .end
> >
> > diff --git a/MdePkg/Library/BaseLib/LoongArch64/EnableInterrupts.S b/MdePkg/Library/BaseLib/LoongArch64/EnableInterrupts.S
> > new file mode 100644
> > index 0000000000..3c34fb2cdd
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseLib/LoongArch64/EnableInterrupts.S
> > @@ -0,0 +1,21 @@
> > +#------------------------------------------------------------------------------
> >
> > +#
> >
> > +# LoongArch interrupt enable
> >
> > +#
> >
> > +# Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
> >
> > +#
> >
> > +# SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> > +#
> >
> > +#------------------------------------------------------------------------------
> >
> > +
> >
> > +ASM_GLOBAL ASM_PFX(EnableInterrupts)
> >
> > +
> >
> > +#/**
> >
> > +# Enables CPU interrupts.
> >
> > +#**/
> >
> > +
> >
> > +ASM_PFX(EnableInterrupts):
> >
> > + li.w $t0, 0x4
> >
> > + csrxchg $t0, $t0, 0x0
> >
> > + jirl $zero, $ra, 0
> >
> > + .end
> >
> > diff --git a/MdePkg/Library/BaseLib/LoongArch64/GetInterruptState.S b/MdePkg/Library/BaseLib/LoongArch64/GetInterruptState.S
> > new file mode 100644
> > index 0000000000..bfd1f2d5f7
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseLib/LoongArch64/GetInterruptState.S
> > @@ -0,0 +1,35 @@
> > +#------------------------------------------------------------------------------
> >
> > +#
> >
> > +# Get LoongArch interrupt status
> >
> > +#
> >
> > +# Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
> >
> > +#
> >
> > +# SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> > +#
> >
> > +#------------------------------------------------------------------------------
> >
> > +
> >
> > +ASM_GLOBAL ASM_PFX(GetInterruptState)
> >
> > +
> >
> > +#/**
> >
> > +# Retrieves the current CPU interrupt state.
> >
> > +#
> >
> > +# Returns TRUE means interrupts are currently enabled. Otherwise,
> >
> > +# returns FALSE.
> >
> > +#
> >
> > +# @retval TRUE CPU interrupts are enabled.
> >
> > +# @retval FALSE CPU interrupts are disabled.
> >
> > +#
> >
> > +#**/
> >
> > +
> >
> > +ASM_PFX(GetInterruptState):
> >
> > + li.w $t1, 0x4
> >
> > + csrrd $t0, 0x0
> >
> > + and $t0, $t0, $t1
> >
> > + beqz $t0, 1f
> >
> > + li.w $a0, 0x1
> >
> > + b 2f
> >
> > +1:
> >
> > + li.w $a0, 0x0
> >
> > +2:
> >
> > + jirl $zero, $ra, 0
> >
> > + .end
> >
> > diff --git a/MdePkg/Library/BaseLib/LoongArch64/InternalSwitchStack.c
> > b/MdePkg/Library/BaseLib/LoongArch64/InternalSwitchStack.c
> > new file mode 100644
> > index 0000000000..859bc96329
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseLib/LoongArch64/InternalSwitchStack.c
> > @@ -0,0 +1,58 @@
> > +/** @file
> >
> > + SwitchStack() function for LoongArch.
> >
> > +
> >
> > + Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
> >
> > +
> >
> > + SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> > +**/
> >
> > +
> >
> > +#include "BaseLibInternals.h"
> >
> > +
> >
> > +UINTN
> >
> > +EFIAPI
> >
> > +InternalSwitchStackAsm (
> >
> > + IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer
> >
> > + );
> >
> > +
> >
> > +/**
> >
> > + Transfers control to a function starting with a new stack.
> >
> > +
> >
> > + Transfers control to the function specified by EntryPoint using the
> >
> > + new stack specified by NewStack and passing in the parameters specified
> >
> > + by Context1 and Context2. Context1 and Context2 are optional and may
> >
> > + be NULL. The function EntryPoint must never return.
> >
> > +
> >
> > + If EntryPoint is NULL, then ASSERT().
> >
> > + If NewStack is NULL, then ASSERT().
> >
> > +
> >
> > + @param[in] EntryPoint A pointer to function to call with the new stack.
> >
> > + @param[in] Context1 A pointer to the context to pass into the EntryPoint
> >
> > + function.
> >
> > + @param[in] Context2 A pointer to the context to pass into the EntryPoint
> >
> > + function.
> >
> > + @param[in] NewStack A pointer to the new stack to use for the EntryPoint
> >
> > + function.
> >
> > + @param[in] Marker VA_LIST marker for the variable argument list.
> >
> > +
> >
> > +**/
> >
> > +VOID
> >
> > +EFIAPI
> >
> > +InternalSwitchStack (
> >
> > + IN SWITCH_STACK_ENTRY_POINT EntryPoint,
> >
> > + IN VOID *Context1 OPTIONAL,
> >
> > + IN VOID *Context2 OPTIONAL,
> >
> > + IN VOID *NewStack,
> >
> > + IN VA_LIST Marker
> >
> > + )
> >
> > +
> >
> > +{
> >
> > + BASE_LIBRARY_JUMP_BUFFER JumpBuffer;
> >
> > +
> >
> > + JumpBuffer.RA = (UINTN)EntryPoint;
> >
> > + JumpBuffer.SP = (UINTN)NewStack - sizeof (VOID *);
> >
> > + JumpBuffer.SP -= sizeof (Context1) + sizeof (Context2);
> >
> > + ((VOID **)(UINTN)JumpBuffer.SP)[0] = Context1;
> >
> > + ((VOID **)(UINTN)JumpBuffer.SP)[1] = Context2;
> >
> > +
> >
> > + InternalSwitchStackAsm (&JumpBuffer);
> >
> > +}
> >
> > diff --git a/MdePkg/Library/BaseLib/LoongArch64/MemoryFence.S b/MdePkg/Library/BaseLib/LoongArch64/MemoryFence.S
> > new file mode 100644
> > index 0000000000..0d8dc10914
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseLib/LoongArch64/MemoryFence.S
> > @@ -0,0 +1,19 @@
> > +#------------------------------------------------------------------------------
> >
> > +#
> >
> > +# MemoryFence() for LoongArch64
> >
> > +#
> >
> > +# Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
> >
> > +#
> >
> > +# SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> > +#
> >
> > +#------------------------------------------------------------------------------
> >
> > +
> >
> > +ASM_GLOBAL ASM_PFX(MemoryFence)
> >
> > +
> >
> > +#
> >
> > +# Memory fence for LoongArch64
> >
> > +#
> >
> > +ASM_PFX(MemoryFence):
> >
> > + dbar 0
> >
> > + jirl $zero, $ra, 0
> >
> > + .end
> >
> > diff --git a/MdePkg/Library/BaseLib/LoongArch64/SetJumpLongJump.S b/MdePkg/Library/BaseLib/LoongArch64/SetJumpLongJump.S
> > new file mode 100644
> > index 0000000000..1c6ee54b6f
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseLib/LoongArch64/SetJumpLongJump.S
> > @@ -0,0 +1,49 @@
> > +#------------------------------------------------------------------------------
> >
> > +#
> >
> > +# Set/Long jump for LoongArch
> >
> > +#
> >
> > +# Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
> >
> > +#
> >
> > +# SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> > +#
> >
> > +#------------------------------------------------------------------------------
> >
> > +
> >
> > +#define STORE st.d /* 64 bit mode regsave instruction */
> >
> > +#define LOAD ld.d /* 64 bit mode regload instruction */
> >
> > +#define RSIZE 8 /* 64 bit mode register size */
> >
> > +
> >
> > +ASM_GLOBAL ASM_PFX(SetJump)
> >
> > +ASM_GLOBAL ASM_PFX(InternalLongJump)
> >
> > +
> >
> > +ASM_PFX(SetJump):
> >
> > + STORE $s0, $a0, RSIZE * 0
> >
> > + STORE $s1, $a0, RSIZE * 1
> >
> > + STORE $s2, $a0, RSIZE * 2
> >
> > + STORE $s3, $a0, RSIZE * 3
> >
> > + STORE $s4, $a0, RSIZE * 4
> >
> > + STORE $s5, $a0, RSIZE * 5
> >
> > + STORE $s6, $a0, RSIZE * 6
> >
> > + STORE $s7, $a0, RSIZE * 7
> >
> > + STORE $s8, $a0, RSIZE * 8
> >
> > + STORE $sp, $a0, RSIZE * 9
> >
> > + STORE $fp, $a0, RSIZE * 10
> >
> > + STORE $ra, $a0, RSIZE * 11
> >
> > + li.w $a0, 0 # Setjmp return
> >
> > + jirl $zero, $ra, 0
> >
> > +
> >
> > +ASM_PFX(InternalLongJump):
> >
> > + LOAD $ra, $a0, RSIZE * 11
> >
> > + LOAD $s0, $a0, RSIZE * 0
> >
> > + LOAD $s1, $a0, RSIZE * 1
> >
> > + LOAD $s2, $a0, RSIZE * 2
> >
> > + LOAD $s3, $a0, RSIZE * 3
> >
> > + LOAD $s4, $a0, RSIZE * 4
> >
> > + LOAD $s5, $a0, RSIZE * 5
> >
> > + LOAD $s6, $a0, RSIZE * 6
> >
> > + LOAD $s7, $a0, RSIZE * 7
> >
> > + LOAD $s8, $a0, RSIZE * 8
> >
> > + LOAD $sp, $a0, RSIZE * 9
> >
> > + LOAD $fp, $a0, RSIZE * 10
> >
> > + move $a0, $a1
> >
> > + jirl $zero, $ra, 0
> >
> > + .end
> >
> > diff --git a/MdePkg/Library/BaseLib/LoongArch64/SwitchStack.S b/MdePkg/Library/BaseLib/LoongArch64/SwitchStack.S
> > new file mode 100644
> > index 0000000000..ad9aa8b343
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseLib/LoongArch64/SwitchStack.S
> > @@ -0,0 +1,39 @@
> > +#------------------------------------------------------------------------------
> >
> > +#
> >
> > +# InternalSwitchStackAsm for LoongArch
> >
> > +#
> >
> > +# Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
> >
> > +#
> >
> > +# SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> > +#
> >
> > +#------------------------------------------------------------------------------
> >
> > +
> >
> > +#define STORE st.d /* 64 bit mode regsave instruction */
> >
> > +#define LOAD ld.d /* 64 bit mode regload instruction */
> >
> > +#define RSIZE 8 /* 64 bit mode register size */
> >
> > +
> >
> > +ASM_GLOBAL ASM_PFX(InternalSwitchStackAsm)
> >
> > +
> >
> > +/**
> >
> > + This allows the caller to switch the stack and goes to the new entry point
> >
> > +
> >
> > + @param JumpBuffer A pointer to CPU context buffer.
> >
> > +**/
> >
> > +
> >
> > +ASM_PFX(InternalSwitchStackAsm):
> >
> > + LOAD $ra, $a0, RSIZE * 11
> >
> > + LOAD $s0, $a0, RSIZE * 0
> >
> > + LOAD $s1, $a0, RSIZE * 1
> >
> > + LOAD $s2, $a0, RSIZE * 2
> >
> > + LOAD $s3, $a0, RSIZE * 3
> >
> > + LOAD $s4, $a0, RSIZE * 4
> >
> > + LOAD $s5, $a0, RSIZE * 5
> >
> > + LOAD $s6, $a0, RSIZE * 6
> >
> > + LOAD $s7, $a0, RSIZE * 7
> >
> > + LOAD $s8, $a0, RSIZE * 8
> >
> > + LOAD $sp, $a0, RSIZE * 9
> >
> > + LOAD $fp, $a0, RSIZE * 10
> >
> > + LOAD $a0, $sp, 0
> >
> > + LOAD $a1, $sp, 8
> >
> > + jirl $zero, $ra, 0
> >
> > + .end
> >
> > diff --git a/MdePkg/Library/BaseLib/LoongArch64/Unaligned.c b/MdePkg/Library/BaseLib/LoongArch64/Unaligned.c
> > new file mode 100644
> > index 0000000000..335379ecb1
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseLib/LoongArch64/Unaligned.c
> > @@ -0,0 +1,242 @@
> > +/** @file
> >
> > + Unaligned access functions of BaseLib for LoongArch.
> >
> > +
> >
> > + Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
> >
> > +
> >
> > + SPDX-License-Identifier: BSD-2-Clause-Patent
> >
> > +
> >
> > +**/
> >
> > +
> >
> > +#include "BaseLibInternals.h"
> >
> > +
> >
> > +/**
> >
> > + Reads a 16-bit value from memory that may be unaligned.
> >
> > +
> >
> > + This function returns the 16-bit value pointed to by Buffer. The function
> >
> > + guarantees that the read operation does not produce an alignment fault.
> >
> > +
> >
> > + If the Buffer is NULL, then ASSERT().
> >
> > +
> >
> > + @param[in] Buffer The pointer to a 16-bit value that may be unaligned.
> >
> > +
> >
> > + @return The 16-bit value read from Buffer.
> >
> > +
> >
> > +**/
> >
> > +UINT16
> >
> > +EFIAPI
> >
> > +ReadUnaligned16 (
> >
> > + IN CONST UINT16 *Buffer
> >
> > + )
> >
> > +{
> >
> > + volatile UINT8 LowerByte;
> >
> > + volatile UINT8 HigherByte;
> >
> > +
> >
> > + ASSERT (Buffer != NULL);
> >
> > +
> >
> > + LowerByte = ((UINT8 *)Buffer)[0];
> >
> > + HigherByte = ((UINT8 *)Buffer)[1];
> >
> > +
> >
> > + return (UINT16)(LowerByte | (HigherByte << 8));
> >
> > +}
> >
> > +
> >
> > +/**
> >
> > + Writes a 16-bit value to memory that may be unaligned.
> >
> > +
> >
> > + This function writes the 16-bit value specified by Value to Buffer. Value is
> >
> > + returned. The function guarantees that the write operation does not produce
> >
> > + an alignment fault.
> >
> > +
> >
> > + If the Buffer is NULL, then ASSERT().
> >
> > +
> >
> > + @param[out] Buffer The pointer to a 16-bit value that may be unaligned.
> >
> > + @param[in] Value 16-bit value to write to Buffer.
> >
> > +
> >
> > + @return The 16-bit value to write to Buffer.
> >
> > +
> >
> > +**/
> >
> > +UINT16
> >
> > +EFIAPI
> >
> > +WriteUnaligned16 (
> >
> > + OUT UINT16 *Buffer,
> >
> > + IN UINT16 Value
> >
> > + )
> >
> > +{
> >
> > + ASSERT (Buffer != NULL);
> >
> > +
> >
> > + ((volatile UINT8 *)Buffer)[0] = (UINT8)Value;
> >
> > + ((volatile UINT8 *)Buffer)[1] = (UINT8)(Value >> 8);
> >
> > +
> >
> > + return Value;
> >
> > +}
> >
> > +
> >
> > +/**
> >
> > + Reads a 24-bit value from memory that may be unaligned.
> >
> > +
> >
> > + This function returns the 24-bit value pointed to by Buffer. The function
> >
> > + guarantees that the read operation does not produce an alignment fault.
> >
> > +
> >
> > + If the Buffer is NULL, then ASSERT().
> >
> > +
> >
> > + @param[in] Buffer The pointer to a 24-bit value that may be unaligned.
> >
> > +
> >
> > + @return The 24-bit value read from Buffer.
> >
> > +
> >
> > +**/
> >
> > +UINT32
> >
> > +EFIAPI
> >
> > +ReadUnaligned24 (
> >
> > + IN CONST UINT32 *Buffer
> >
> > + )
> >
> > +{
> >
> > + ASSERT (Buffer != NULL);
> >
> > +
> >
> > + return (UINT32)(ReadUnaligned16 ((UINT16 *)Buffer) |
> >
> > + (((UINT8 *)Buffer)[2] << 16));
> >
> > +}
> >
> > +
> >
> > +/**
> >
> > + Writes a 24-bit value to memory that may be unaligned.
> >
> > +
> >
> > + This function writes the 24-bit value specified by Value to Buffer. Value is
> >
> > + returned. The function guarantees that the write operation does not produce
> >
> > + an alignment fault.
> >
> > +
> >
> > + If the Buffer is NULL, then ASSERT().
> >
> > +
> >
> > + @param[out] Buffer The pointer to a 24-bit value that may be unaligned.
> >
> > + @param[in] Value 24-bit value to write to Buffer.
> >
> > +
> >
> > + @return The 24-bit value to write to Buffer.
> >
> > +
> >
> > +**/
> >
> > +UINT32
> >
> > +EFIAPI
> >
> > +WriteUnaligned24 (
> >
> > + OUT UINT32 *Buffer,
> >
> > + IN UINT32 Value
> >
> > + )
> >
> > +{
> >
> > + ASSERT (Buffer != NULL);
> >
> > +
> >
> > + WriteUnaligned16 ((UINT16 *)Buffer, (UINT16)Value);
> >
> > + *(UINT8 *)((UINT16 *)Buffer + 1) = (UINT8)(Value >> 16);
> >
> > + return Value;
> >
> > +}
> >
> > +
> >
> > +/**
> >
> > + Reads a 32-bit value from memory that may be unaligned.
> >
> > +
> >
> > + This function returns the 32-bit value pointed to by Buffer. The function
> >
> > + guarantees that the read operation does not produce an alignment fault.
> >
> > +
> >
> > + If the Buffer is NULL, then ASSERT().
> >
> > +
> >
> > + @param[in] Buffer The pointer to a 32-bit value that may be unaligned.
> >
> > +
> >
> > + @return The 32-bit value read from Buffer.
> >
> > +
> >
> > +**/
> >
> > +UINT32
> >
> > +EFIAPI
> >
> > +ReadUnaligned32 (
> >
> > + IN CONST UINT32 *Buffer
> >
> > + )
> >
> > +{
> >
> > + UINT16 LowerBytes;
> >
> > + UINT16 HigherBytes;
> >
> > +
> >
> > + ASSERT (Buffer != NULL);
> >
> > +
> >
> > + LowerBytes = ReadUnaligned16 ((UINT16 *)Buffer);
> >
> > + HigherBytes = ReadUnaligned16 ((UINT16 *)Buffer + 1);
> >
> > +
> >
> > + return (UINT32)(LowerBytes | (HigherBytes << 16));
> >
> > +}
> >
> > +
> >
> > +/**
> >
> > + Writes a 32-bit value to memory that may be unaligned.
> >
> > +
> >
> > + This function writes the 32-bit value specified by Value to Buffer. Value is
> >
> > + returned. The function guarantees that the write operation does not produce
> >
> > + an alignment fault.
> >
> > +
> >
> > + If the Buffer is NULL, then ASSERT().
> >
> > +
> >
> > + @param[out] Buffer The pointer to a 32-bit value that may be unaligned.
> >
> > + @param[in] Value 32-bit value to write to Buffer.
> >
> > +
> >
> > + @return The 32-bit value to write to Buffer.
> >
> > +
> >
> > +**/
> >
> > +UINT32
> >
> > +EFIAPI
> >
> > +WriteUnaligned32 (
> >
> > + OUT UINT32 *Buffer,
> >
> > + IN UINT32 Value
> >
> > + )
> >
> > +{
> >
> > + ASSERT (Buffer != NULL);
> >
> > +
> >
> > + WriteUnaligned16 ((UINT16 *)Buffer, (UINT16)Value);
> >
> > + WriteUnaligned16 ((UINT16 *)Buffer + 1, (UINT16)(Value >> 16));
> >
> > + return Value;
> >
> > +}
> >
> > +
> >
> > +/**
> >
> > + Reads a 64-bit value from memory that may be unaligned.
> >
> > +
> >
> > + This function returns the 64-bit value pointed to by Buffer. The function
> >
> > + guarantees that the read operation does not produce an alignment fault.
> >
> > +
> >
> > + If the Buffer is NULL, then ASSERT().
> >
> > +
> >
> > + @param[in] Buffer The pointer to a 64-bit value that may be unaligned.
> >
> > +
> >
> > + @return The 64-bit value read from Buffer.
> >
> > +
> >
> > +**/
> >
> > +UINT64
> >
> > +EFIAPI
> >
> > +ReadUnaligned64 (
> >
> > + IN CONST UINT64 *Buffer
> >
> > + )
> >
> > +{
> >
> > + UINT32 LowerBytes;
> >
> > + UINT32 HigherBytes;
> >
> > +
> >
> > + ASSERT (Buffer != NULL);
> >
> > +
> >
> > + LowerBytes = ReadUnaligned32 ((UINT32 *)Buffer);
> >
> > + HigherBytes = ReadUnaligned32 ((UINT32 *)Buffer + 1);
> >
> > +
> >
> > + return (UINT64)(LowerBytes | LShiftU64 (HigherBytes, 32));
> >
> > +}
> >
> > +
> >
> > +/**
> >
> > + Writes a 64-bit value to memory that may be unaligned.
> >
> > +
> >
> > + This function writes the 64-bit value specified by Value to Buffer. Value is
> >
> > + returned. The function guarantees that the write operation does not produce
> >
> > + an alignment fault.
> >
> > +
> >
> > + If the Buffer is NULL, then ASSERT().
> >
> > +
> >
> > + @param[out] Buffer The pointer to a 64-bit value that may be unaligned.
> >
> > + @param[in] Value 64-bit value to write to Buffer.
> >
> > +
> >
> > + @return The 64-bit value to write to Buffer.
> >
> > +
> >
> > +**/
> >
> > +UINT64
> >
> > +EFIAPI
> >
> > +WriteUnaligned64 (
> >
> > + OUT UINT64 *Buffer,
> >
> > + IN UINT64 Value
> >
> > + )
> >
> > +{
> >
> > + ASSERT (Buffer != NULL);
> >
> > +
> >
> > + WriteUnaligned32 ((UINT32 *)Buffer, (UINT32)Value);
> >
> > + WriteUnaligned32 ((UINT32 *)Buffer + 1, (UINT32)RShiftU64 (Value, 32));
> >
> > + return Value;
> >
> > +}
> >
> > --
> > 2.27.0
>
>
>
>
>
>
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