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Message-ID: <c47cd290-7e0c-db0b-d4a8-9db56fd67782@xen0n.name>
Date: Thu, 19 May 2022 00:04:40 +0800
From: WANG Xuerui <kernel@...0n.name>
To: Huacai Chen <chenhuacai@...ngson.cn>,
Arnd Bergmann <arnd@...db.de>,
Andy Lutomirski <luto@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
David Airlie <airlied@...ux.ie>,
Jonathan Corbet <corbet@....net>,
Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
Yanteng Si <siyanteng@...ngson.cn>,
Huacai Chen <chenhuacai@...il.com>,
Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH V11 08/22] LoongArch: Add other common headers
On 5/18/22 17:26, Huacai Chen wrote:
> Add some other common headers for basic LoongArch support.
>
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
> arch/loongarch/include/asm/asm-prototypes.h | 7 +
> arch/loongarch/include/asm/asm.h | 187 ++++++++++++
> arch/loongarch/include/asm/asmmacro.h | 289 ++++++++++++++++++
> arch/loongarch/include/asm/clocksource.h | 12 +
> arch/loongarch/include/asm/compiler.h | 15 +
> arch/loongarch/include/asm/inst.h | 117 +++++++
> arch/loongarch/include/asm/linkage.h | 36 +++
> arch/loongarch/include/asm/perf_event.h | 10 +
> arch/loongarch/include/asm/prefetch.h | 29 ++
> arch/loongarch/include/asm/serial.h | 11 +
> arch/loongarch/include/asm/time.h | 50 +++
> arch/loongarch/include/asm/timex.h | 33 ++
> arch/loongarch/include/asm/topology.h | 15 +
> arch/loongarch/include/asm/types.h | 19 ++
> arch/loongarch/include/uapi/asm/bitsperlong.h | 9 +
> arch/loongarch/include/uapi/asm/byteorder.h | 13 +
> arch/loongarch/include/uapi/asm/reg.h | 59 ++++
> tools/include/uapi/asm/bitsperlong.h | 2 +
> 18 files changed, 913 insertions(+)
> create mode 100644 arch/loongarch/include/asm/asm-prototypes.h
> create mode 100644 arch/loongarch/include/asm/asm.h
> create mode 100644 arch/loongarch/include/asm/asmmacro.h
> create mode 100644 arch/loongarch/include/asm/clocksource.h
> create mode 100644 arch/loongarch/include/asm/compiler.h
> create mode 100644 arch/loongarch/include/asm/inst.h
> create mode 100644 arch/loongarch/include/asm/linkage.h
> create mode 100644 arch/loongarch/include/asm/perf_event.h
> create mode 100644 arch/loongarch/include/asm/prefetch.h
> create mode 100644 arch/loongarch/include/asm/serial.h
> create mode 100644 arch/loongarch/include/asm/time.h
> create mode 100644 arch/loongarch/include/asm/timex.h
> create mode 100644 arch/loongarch/include/asm/topology.h
> create mode 100644 arch/loongarch/include/asm/types.h
> create mode 100644 arch/loongarch/include/uapi/asm/bitsperlong.h
> create mode 100644 arch/loongarch/include/uapi/asm/byteorder.h
> create mode 100644 arch/loongarch/include/uapi/asm/reg.h
>
> diff --git a/arch/loongarch/include/asm/asm-prototypes.h b/arch/loongarch/include/asm/asm-prototypes.h
> new file mode 100644
> index 000000000000..ed06d3997420
> --- /dev/null
> +++ b/arch/loongarch/include/asm/asm-prototypes.h
> @@ -0,0 +1,7 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#include <linux/uaccess.h>
> +#include <asm/fpu.h>
> +#include <asm/mmu_context.h>
> +#include <asm/page.h>
> +#include <asm/ftrace.h>
> +#include <asm-generic/asm-prototypes.h>
> diff --git a/arch/loongarch/include/asm/asm.h b/arch/loongarch/include/asm/asm.h
> new file mode 100644
> index 000000000000..a387773ba5d0
> --- /dev/null
> +++ b/arch/loongarch/include/asm/asm.h
> @@ -0,0 +1,187 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Some useful macros for LoongArch assembler code
> + *
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + *
> + * Derived from MIPS:
> + * Copyright (C) 1995, 1996, 1997, 1999, 2001 by Ralf Baechle
> + * Copyright (C) 1999 by Silicon Graphics, Inc.
> + * Copyright (C) 2001 MIPS Technologies, Inc.
> + * Copyright (C) 2002 Maciej W. Rozycki
> + */
> +#ifndef __ASM_ASM_H
> +#define __ASM_ASM_H
> +
> +/* LoongArch pref instruction. */
> +#ifdef CONFIG_CPU_HAS_PREFETCH
> +
> +#define PREF(hint, addr, offs) \
> + preld hint, addr, offs; \
> +
> +#define PREFX(hint, addr, index) \
> + preldx hint, addr, index; \
> +
> +#else /* !CONFIG_CPU_HAS_PREFETCH */
> +
> +#define PREF(hint, addr, offs)
> +#define PREFX(hint, addr, index)
> +
> +#endif /* !CONFIG_CPU_HAS_PREFETCH */
Actually I didn't spot any usage of these 2 macros, so they can be removed?
> +
> +/*
> + * Stack alignment
> + */
> +#define STACK_ALIGN ~(0xf)
> +
> +/*
> + * Macros to handle different pointer/register sizes for 32/64-bit code
> + */
> +
> +/*
> + * Size of a register
> + */
> +#ifndef __loongarch64
> +#define SZREG 4
> +#else
> +#define SZREG 8
> +#endif
> +
> +/*
> + * Use the following macros in assemblercode to load/store registers,
> + * pointers etc.
> + */
> +#if (SZREG == 4)
> +#define REG_L ld.w
> +#define REG_S st.w
> +#define REG_ADD add.w
> +#define REG_SUB sub.w
> +#else /* SZREG == 8 */
> +#define REG_L ld.d
> +#define REG_S st.d
> +#define REG_ADD add.d
> +#define REG_SUB sub.d
> +#endif
> +
> +/*
> + * How to add/sub/load/store/shift C int variables.
> + */
> +#if (__SIZEOF_INT__ == 4)
> +#define INT_ADD add.w
> +#define INT_ADDI addi.w
> +#define INT_SUB sub.w
> +#define INT_L ld.w
> +#define INT_S st.w
> +#define INT_SLL slli.w
> +#define INT_SLLV sll.w
> +#define INT_SRL srli.w
> +#define INT_SRLV srl.w
> +#define INT_SRA srai.w
> +#define INT_SRAV sra.w
> +#endif
> +
> +#if (__SIZEOF_INT__ == 8)
> +#define INT_ADD add.d
> +#define INT_ADDI addi.d
> +#define INT_SUB sub.d
> +#define INT_L ld.d
> +#define INT_S st.d
> +#define INT_SLL slli.d
> +#define INT_SLLV sll.d
> +#define INT_SRL srli.d
> +#define INT_SRLV srl.d
> +#define INT_SRA srai.d
> +#define INT_SRAV sra.d
> +#endif
> +
> +/*
> + * How to add/sub/load/store/shift C long variables.
> + */
> +#if (__SIZEOF_LONG__ == 4)
> +#define LONG_ADD add.w
> +#define LONG_ADDI addi.w
> +#define LONG_SUB sub.w
> +#define LONG_L ld.w
> +#define LONG_S st.w
> +#define LONG_SLL slli.w
> +#define LONG_SLLV sll.w
> +#define LONG_SRL srli.w
> +#define LONG_SRLV srl.w
> +#define LONG_SRA srai.w
> +#define LONG_SRAV sra.w
> +
> +#ifdef __ASSEMBLY__
> +#define LONG .word
> +#endif
> +#define LONGSIZE 4
> +#define LONGMASK 3
> +#define LONGLOG 2
> +#endif
> +
> +#if (__SIZEOF_LONG__ == 8)
> +#define LONG_ADD add.d
> +#define LONG_ADDI addi.d
> +#define LONG_SUB sub.d
> +#define LONG_L ld.d
> +#define LONG_S st.d
> +#define LONG_SLL slli.d
> +#define LONG_SLLV sll.d
> +#define LONG_SRL srli.d
> +#define LONG_SRLV srl.d
> +#define LONG_SRA srai.d
> +#define LONG_SRAV sra.d
> +
> +#ifdef __ASSEMBLY__
> +#define LONG .dword
> +#endif
> +#define LONGSIZE 8
> +#define LONGMASK 7
> +#define LONGLOG 3
> +#endif
> +
> +/*
> + * How to add/sub/load/store/shift pointers.
> + */
> +#if (__SIZEOF_POINTER__ == 4)
> +#define PTR_ADD add.w
> +#define PTR_ADDI addi.w
> +#define PTR_SUB sub.w
> +#define PTR_L ld.w
> +#define PTR_S st.w
> +#define PTR_LI li.w
> +#define PTR_SLL slli.w
> +#define PTR_SLLV sll.w
> +#define PTR_SRL srli.w
> +#define PTR_SRLV srl.w
> +#define PTR_SRA srai.w
> +#define PTR_SRAV sra.w
> +
> +#define PTR_SCALESHIFT 2
> +
> +#define PTR .word
> +#define PTRSIZE 4
> +#define PTRLOG 2
> +#endif
> +
> +#if (__SIZEOF_POINTER__ == 8)
> +#define PTR_ADD add.d
> +#define PTR_ADDI addi.d
> +#define PTR_SUB sub.d
> +#define PTR_L ld.d
> +#define PTR_S st.d
> +#define PTR_LI li.d
> +#define PTR_SLL slli.d
> +#define PTR_SLLV sll.d
> +#define PTR_SRL srli.d
> +#define PTR_SRLV srl.d
> +#define PTR_SRA srai.d
> +#define PTR_SRAV sra.d
> +
> +#define PTR_SCALESHIFT 3
> +
> +#define PTR .dword
> +#define PTRSIZE 8
> +#define PTRLOG 3
> +#endif
Actually I've overlooked in v10, but it seems most of the definitions
here are unused; I only see LONG_{L,S,ADD} and PTR_{LI,S,ADD,ADDI}, for
example.
Can we strip down these definitions?
> +
> +#endif /* __ASM_ASM_H */
> diff --git a/arch/loongarch/include/asm/asmmacro.h b/arch/loongarch/include/asm/asmmacro.h
> new file mode 100644
> index 000000000000..a1a04083bd67
> --- /dev/null
> +++ b/arch/loongarch/include/asm/asmmacro.h
> @@ -0,0 +1,289 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_ASMMACRO_H
> +#define _ASM_ASMMACRO_H
> +
> +#include <asm/asm-offsets.h>
> +#include <asm/regdef.h>
> +#include <asm/fpregdef.h>
> +#include <asm/loongarch.h>
> +
> + .macro parse_v var val
> + \var = \val
> + .endm
> +
> + .macro parse_r var r
> + \var = -1
> + .ifc \r, $r0
> + \var = 0
> + .endif
> + .ifc \r, $r1
> + \var = 1
> + .endif
> + .ifc \r, $r2
> + \var = 2
> + .endif
> + .ifc \r, $r3
> + \var = 3
> + .endif
> + .ifc \r, $r4
> + \var = 4
> + .endif
> + .ifc \r, $r5
> + \var = 5
> + .endif
> + .ifc \r, $r6
> + \var = 6
> + .endif
> + .ifc \r, $r7
> + \var = 7
> + .endif
> + .ifc \r, $r8
> + \var = 8
> + .endif
> + .ifc \r, $r9
> + \var = 9
> + .endif
> + .ifc \r, $r10
> + \var = 10
> + .endif
> + .ifc \r, $r11
> + \var = 11
> + .endif
> + .ifc \r, $r12
> + \var = 12
> + .endif
> + .ifc \r, $r13
> + \var = 13
> + .endif
> + .ifc \r, $r14
> + \var = 14
> + .endif
> + .ifc \r, $r15
> + \var = 15
> + .endif
> + .ifc \r, $r16
> + \var = 16
> + .endif
> + .ifc \r, $r17
> + \var = 17
> + .endif
> + .ifc \r, $r18
> + \var = 18
> + .endif
> + .ifc \r, $r19
> + \var = 19
> + .endif
> + .ifc \r, $r20
> + \var = 20
> + .endif
> + .ifc \r, $r21
> + \var = 21
> + .endif
> + .ifc \r, $r22
> + \var = 22
> + .endif
> + .ifc \r, $r23
> + \var = 23
> + .endif
> + .ifc \r, $r24
> + \var = 24
> + .endif
> + .ifc \r, $r25
> + \var = 25
> + .endif
> + .ifc \r, $r26
> + \var = 26
> + .endif
> + .ifc \r, $r27
> + \var = 27
> + .endif
> + .ifc \r, $r28
> + \var = 28
> + .endif
> + .ifc \r, $r29
> + \var = 29
> + .endif
> + .ifc \r, $r30
> + \var = 30
> + .endif
> + .ifc \r, $r31
> + \var = 31
> + .endif
> + .iflt \var
> + .error "Unable to parse register name \r"
> + .endif
> + .endm
> +
> + .macro cpu_save_nonscratch thread
> + stptr.d s0, \thread, THREAD_REG23
> + stptr.d s1, \thread, THREAD_REG24
> + stptr.d s2, \thread, THREAD_REG25
> + stptr.d s3, \thread, THREAD_REG26
> + stptr.d s4, \thread, THREAD_REG27
> + stptr.d s5, \thread, THREAD_REG28
> + stptr.d s6, \thread, THREAD_REG29
> + stptr.d s7, \thread, THREAD_REG30
> + stptr.d s8, \thread, THREAD_REG31
> + stptr.d sp, \thread, THREAD_REG03
> + stptr.d fp, \thread, THREAD_REG22
> + .endm
> +
> + .macro cpu_restore_nonscratch thread
> + ldptr.d s0, \thread, THREAD_REG23
> + ldptr.d s1, \thread, THREAD_REG24
> + ldptr.d s2, \thread, THREAD_REG25
> + ldptr.d s3, \thread, THREAD_REG26
> + ldptr.d s4, \thread, THREAD_REG27
> + ldptr.d s5, \thread, THREAD_REG28
> + ldptr.d s6, \thread, THREAD_REG29
> + ldptr.d s7, \thread, THREAD_REG30
> + ldptr.d s8, \thread, THREAD_REG31
> + ldptr.d ra, \thread, THREAD_REG01
> + ldptr.d sp, \thread, THREAD_REG03
> + ldptr.d fp, \thread, THREAD_REG22
> + .endm
> +
> + .macro fpu_save_csr thread tmp
> + movfcsr2gr \tmp, fcsr0
> + stptr.w \tmp, \thread, THREAD_FCSR
> + .endm
> +
> + .macro fpu_restore_csr thread tmp
> + ldptr.w \tmp, \thread, THREAD_FCSR
> + movgr2fcsr fcsr0, \tmp
> + .endm
> +
> + .macro fpu_save_cc thread tmp0 tmp1
> + movcf2gr \tmp0, $fcc0
> + move \tmp1, \tmp0
> + movcf2gr \tmp0, $fcc1
> + bstrins.d \tmp1, \tmp0, 15, 8
> + movcf2gr \tmp0, $fcc2
> + bstrins.d \tmp1, \tmp0, 23, 16
> + movcf2gr \tmp0, $fcc3
> + bstrins.d \tmp1, \tmp0, 31, 24
> + movcf2gr \tmp0, $fcc4
> + bstrins.d \tmp1, \tmp0, 39, 32
> + movcf2gr \tmp0, $fcc5
> + bstrins.d \tmp1, \tmp0, 47, 40
> + movcf2gr \tmp0, $fcc6
> + bstrins.d \tmp1, \tmp0, 55, 48
> + movcf2gr \tmp0, $fcc7
> + bstrins.d \tmp1, \tmp0, 63, 56
> + stptr.d \tmp1, \thread, THREAD_FCC
> + .endm
> +
> + .macro fpu_restore_cc thread tmp0 tmp1
> + ldptr.d \tmp0, \thread, THREAD_FCC
> + bstrpick.d \tmp1, \tmp0, 7, 0
> + movgr2cf $fcc0, \tmp1
> + bstrpick.d \tmp1, \tmp0, 15, 8
> + movgr2cf $fcc1, \tmp1
> + bstrpick.d \tmp1, \tmp0, 23, 16
> + movgr2cf $fcc2, \tmp1
> + bstrpick.d \tmp1, \tmp0, 31, 24
> + movgr2cf $fcc3, \tmp1
> + bstrpick.d \tmp1, \tmp0, 39, 32
> + movgr2cf $fcc4, \tmp1
> + bstrpick.d \tmp1, \tmp0, 47, 40
> + movgr2cf $fcc5, \tmp1
> + bstrpick.d \tmp1, \tmp0, 55, 48
> + movgr2cf $fcc6, \tmp1
> + bstrpick.d \tmp1, \tmp0, 63, 56
> + movgr2cf $fcc7, \tmp1
> + .endm
> +
> + .macro fpu_save_double thread tmp
> + li.w \tmp, THREAD_FPR0
> + PTR_ADD \tmp, \tmp, \thread
> + fst.d $f0, \tmp, THREAD_FPR0 - THREAD_FPR0
> + fst.d $f1, \tmp, THREAD_FPR1 - THREAD_FPR0
> + fst.d $f2, \tmp, THREAD_FPR2 - THREAD_FPR0
> + fst.d $f3, \tmp, THREAD_FPR3 - THREAD_FPR0
> + fst.d $f4, \tmp, THREAD_FPR4 - THREAD_FPR0
> + fst.d $f5, \tmp, THREAD_FPR5 - THREAD_FPR0
> + fst.d $f6, \tmp, THREAD_FPR6 - THREAD_FPR0
> + fst.d $f7, \tmp, THREAD_FPR7 - THREAD_FPR0
> + fst.d $f8, \tmp, THREAD_FPR8 - THREAD_FPR0
> + fst.d $f9, \tmp, THREAD_FPR9 - THREAD_FPR0
> + fst.d $f10, \tmp, THREAD_FPR10 - THREAD_FPR0
> + fst.d $f11, \tmp, THREAD_FPR11 - THREAD_FPR0
> + fst.d $f12, \tmp, THREAD_FPR12 - THREAD_FPR0
> + fst.d $f13, \tmp, THREAD_FPR13 - THREAD_FPR0
> + fst.d $f14, \tmp, THREAD_FPR14 - THREAD_FPR0
> + fst.d $f15, \tmp, THREAD_FPR15 - THREAD_FPR0
> + fst.d $f16, \tmp, THREAD_FPR16 - THREAD_FPR0
> + fst.d $f17, \tmp, THREAD_FPR17 - THREAD_FPR0
> + fst.d $f18, \tmp, THREAD_FPR18 - THREAD_FPR0
> + fst.d $f19, \tmp, THREAD_FPR19 - THREAD_FPR0
> + fst.d $f20, \tmp, THREAD_FPR20 - THREAD_FPR0
> + fst.d $f21, \tmp, THREAD_FPR21 - THREAD_FPR0
> + fst.d $f22, \tmp, THREAD_FPR22 - THREAD_FPR0
> + fst.d $f23, \tmp, THREAD_FPR23 - THREAD_FPR0
> + fst.d $f24, \tmp, THREAD_FPR24 - THREAD_FPR0
> + fst.d $f25, \tmp, THREAD_FPR25 - THREAD_FPR0
> + fst.d $f26, \tmp, THREAD_FPR26 - THREAD_FPR0
> + fst.d $f27, \tmp, THREAD_FPR27 - THREAD_FPR0
> + fst.d $f28, \tmp, THREAD_FPR28 - THREAD_FPR0
> + fst.d $f29, \tmp, THREAD_FPR29 - THREAD_FPR0
> + fst.d $f30, \tmp, THREAD_FPR30 - THREAD_FPR0
> + fst.d $f31, \tmp, THREAD_FPR31 - THREAD_FPR0
> + .endm
> +
> + .macro fpu_restore_double thread tmp
> + li.w \tmp, THREAD_FPR0
> + PTR_ADD \tmp, \tmp, \thread
> + fld.d $f0, \tmp, THREAD_FPR0 - THREAD_FPR0
> + fld.d $f1, \tmp, THREAD_FPR1 - THREAD_FPR0
> + fld.d $f2, \tmp, THREAD_FPR2 - THREAD_FPR0
> + fld.d $f3, \tmp, THREAD_FPR3 - THREAD_FPR0
> + fld.d $f4, \tmp, THREAD_FPR4 - THREAD_FPR0
> + fld.d $f5, \tmp, THREAD_FPR5 - THREAD_FPR0
> + fld.d $f6, \tmp, THREAD_FPR6 - THREAD_FPR0
> + fld.d $f7, \tmp, THREAD_FPR7 - THREAD_FPR0
> + fld.d $f8, \tmp, THREAD_FPR8 - THREAD_FPR0
> + fld.d $f9, \tmp, THREAD_FPR9 - THREAD_FPR0
> + fld.d $f10, \tmp, THREAD_FPR10 - THREAD_FPR0
> + fld.d $f11, \tmp, THREAD_FPR11 - THREAD_FPR0
> + fld.d $f12, \tmp, THREAD_FPR12 - THREAD_FPR0
> + fld.d $f13, \tmp, THREAD_FPR13 - THREAD_FPR0
> + fld.d $f14, \tmp, THREAD_FPR14 - THREAD_FPR0
> + fld.d $f15, \tmp, THREAD_FPR15 - THREAD_FPR0
> + fld.d $f16, \tmp, THREAD_FPR16 - THREAD_FPR0
> + fld.d $f17, \tmp, THREAD_FPR17 - THREAD_FPR0
> + fld.d $f18, \tmp, THREAD_FPR18 - THREAD_FPR0
> + fld.d $f19, \tmp, THREAD_FPR19 - THREAD_FPR0
> + fld.d $f20, \tmp, THREAD_FPR20 - THREAD_FPR0
> + fld.d $f21, \tmp, THREAD_FPR21 - THREAD_FPR0
> + fld.d $f22, \tmp, THREAD_FPR22 - THREAD_FPR0
> + fld.d $f23, \tmp, THREAD_FPR23 - THREAD_FPR0
> + fld.d $f24, \tmp, THREAD_FPR24 - THREAD_FPR0
> + fld.d $f25, \tmp, THREAD_FPR25 - THREAD_FPR0
> + fld.d $f26, \tmp, THREAD_FPR26 - THREAD_FPR0
> + fld.d $f27, \tmp, THREAD_FPR27 - THREAD_FPR0
> + fld.d $f28, \tmp, THREAD_FPR28 - THREAD_FPR0
> + fld.d $f29, \tmp, THREAD_FPR29 - THREAD_FPR0
> + fld.d $f30, \tmp, THREAD_FPR30 - THREAD_FPR0
> + fld.d $f31, \tmp, THREAD_FPR31 - THREAD_FPR0
> + .endm
> +
> +.macro not dst src
> + nor \dst, \src, zero
> +.endm
> +
> +.macro bgt r0 r1 label
> + blt \r1, \r0, \label
> +.endm
> +
> +.macro bltz r0 label
> + blt \r0, zero, \label
> +.endm
> +
> +.macro bgez r0 label
> + bge \r0, zero, \label
> +.endm
> +
> +#endif /* _ASM_ASMMACRO_H */
> diff --git a/arch/loongarch/include/asm/clocksource.h b/arch/loongarch/include/asm/clocksource.h
> new file mode 100644
> index 000000000000..58e64aa05d26
> --- /dev/null
> +++ b/arch/loongarch/include/asm/clocksource.h
> @@ -0,0 +1,12 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Author: Huacai Chen <chenhuacai@...ngson.cn>
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __ASM_CLOCKSOURCE_H
> +#define __ASM_CLOCKSOURCE_H
> +
> +#include <asm/vdso/clocksource.h>
> +
> +#endif /* __ASM_CLOCKSOURCE_H */
> diff --git a/arch/loongarch/include/asm/compiler.h b/arch/loongarch/include/asm/compiler.h
> new file mode 100644
> index 000000000000..657cebe70ace
> --- /dev/null
> +++ b/arch/loongarch/include/asm/compiler.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_COMPILER_H
> +#define _ASM_COMPILER_H
> +
> +#define GCC_OFF_SMALL_ASM() "ZC"
> +
> +#define LOONGARCH_ISA_LEVEL "loongarch"
> +#define LOONGARCH_ISA_ARCH_LEVEL "arch=loongarch"
> +#define LOONGARCH_ISA_LEVEL_RAW loongarch
> +#define LOONGARCH_ISA_ARCH_LEVEL_RAW LOONGARCH_ISA_LEVEL_RAW
> +
> +#endif /* _ASM_COMPILER_H */
> diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h
> new file mode 100644
> index 000000000000..575d1bb66ffb
> --- /dev/null
> +++ b/arch/loongarch/include/asm/inst.h
> @@ -0,0 +1,117 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_INST_H
> +#define _ASM_INST_H
> +
> +#include <linux/types.h>
> +#include <asm/asm.h>
> +
> +#define ADDR_IMMMASK_LU52ID 0xFFF0000000000000
> +#define ADDR_IMMMASK_LU32ID 0x000FFFFF00000000
> +#define ADDR_IMMMASK_ADDU16ID 0x00000000FFFF0000
> +
> +#define ADDR_IMMSHIFT_LU52ID 52
> +#define ADDR_IMMSHIFT_LU32ID 32
> +#define ADDR_IMMSHIFT_ADDU16ID 16
> +
> +#define ADDR_IMM(addr, INSN) ((addr & ADDR_IMMMASK_##INSN) >> ADDR_IMMSHIFT_##INSN)
> +
> +enum reg1i20_op {
> + lu12iw_op = 0x0a,
> + lu32id_op = 0x0b,
> +};
> +
> +enum reg2i12_op {
> + lu52id_op = 0x0c,
> +};
> +
> +enum reg2i16_op {
> + jirl_op = 0x13,
> +};
> +
> +struct reg0i26_format {
> + unsigned int immediate_h : 10;
> + unsigned int immediate_l : 16;
> + unsigned int opcode : 6;
> +};
> +
> +struct reg1i20_format {
> + unsigned int rd : 5;
> + unsigned int immediate : 20;
> + unsigned int opcode : 7;
> +};
> +
> +struct reg1i21_format {
> + unsigned int immediate_h : 5;
> + unsigned int rj : 5;
> + unsigned int immediate_l : 16;
> + unsigned int opcode : 6;
> +};
> +
> +struct reg2i12_format {
> + unsigned int rd : 5;
> + unsigned int rj : 5;
> + unsigned int immediate : 12;
> + unsigned int opcode : 10;
> +};
> +
> +struct reg2i16_format {
> + unsigned int rd : 5;
> + unsigned int rj : 5;
> + unsigned int immediate : 16;
> + unsigned int opcode : 6;
> +};
> +
> +union loongarch_instruction {
> + unsigned int word;
> + struct reg0i26_format reg0i26_format;
> + struct reg1i20_format reg1i20_format;
> + struct reg1i21_format reg1i21_format;
> + struct reg2i12_format reg2i12_format;
> + struct reg2i16_format reg2i16_format;
> +};
> +
> +#define LOONGARCH_INSN_SIZE sizeof(union loongarch_instruction)
> +
> +enum loongarch_gpr {
> + LOONGARCH_GPR_ZERO = 0,
> + LOONGARCH_GPR_RA = 1,
> + LOONGARCH_GPR_TP = 2,
> + LOONGARCH_GPR_SP = 3,
> + LOONGARCH_GPR_A0 = 4, /* Reused as V0 for return value */
> + LOONGARCH_GPR_A1, /* Reused as V1 for return value */
> + LOONGARCH_GPR_A2,
> + LOONGARCH_GPR_A3,
> + LOONGARCH_GPR_A4,
> + LOONGARCH_GPR_A5,
> + LOONGARCH_GPR_A6,
> + LOONGARCH_GPR_A7,
> + LOONGARCH_GPR_T0 = 12,
> + LOONGARCH_GPR_T1,
> + LOONGARCH_GPR_T2,
> + LOONGARCH_GPR_T3,
> + LOONGARCH_GPR_T4,
> + LOONGARCH_GPR_T5,
> + LOONGARCH_GPR_T6,
> + LOONGARCH_GPR_T7,
> + LOONGARCH_GPR_T8,
> + LOONGARCH_GPR_FP = 22,
> + LOONGARCH_GPR_S0 = 23,
> + LOONGARCH_GPR_S1,
> + LOONGARCH_GPR_S2,
> + LOONGARCH_GPR_S3,
> + LOONGARCH_GPR_S4,
> + LOONGARCH_GPR_S5,
> + LOONGARCH_GPR_S6,
> + LOONGARCH_GPR_S7,
> + LOONGARCH_GPR_S8,
> + LOONGARCH_GPR_MAX
> +};
> +
> +u32 larch_insn_gen_lu32id(enum loongarch_gpr rd, int imm);
> +u32 larch_insn_gen_lu52id(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm);
> +u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum loongarch_gpr rj, unsigned long pc, unsigned long dest);
> +
> +#endif /* _ASM_INST_H */
> diff --git a/arch/loongarch/include/asm/linkage.h b/arch/loongarch/include/asm/linkage.h
> new file mode 100644
> index 000000000000..81b0c4cfbf4f
> --- /dev/null
> +++ b/arch/loongarch/include/asm/linkage.h
> @@ -0,0 +1,36 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __ASM_LINKAGE_H
> +#define __ASM_LINKAGE_H
> +
> +#define __ALIGN .align 2
> +#define __ALIGN_STR __stringify(__ALIGN)
> +
> +#define SYM_FUNC_START(name) \
> + SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) \
> + .cfi_startproc;
> +
> +#define SYM_FUNC_START_NOALIGN(name) \
> + SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE) \
> + .cfi_startproc;
> +
> +#define SYM_FUNC_START_LOCAL(name) \
> + SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN) \
> + .cfi_startproc;
> +
> +#define SYM_FUNC_START_LOCAL_NOALIGN(name) \
> + SYM_START(name, SYM_L_LOCAL, SYM_A_NONE) \
> + .cfi_startproc;
> +
> +#define SYM_FUNC_START_WEAK(name) \
> + SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN) \
> + .cfi_startproc;
> +
> +#define SYM_FUNC_START_WEAK_NOALIGN(name) \
> + SYM_START(name, SYM_L_WEAK, SYM_A_NONE) \
> + .cfi_startproc;
> +
> +#define SYM_FUNC_END(name) \
> + .cfi_endproc; \
> + SYM_END(name, SYM_T_FUNC)
> +
> +#endif
> diff --git a/arch/loongarch/include/asm/perf_event.h b/arch/loongarch/include/asm/perf_event.h
> new file mode 100644
> index 000000000000..dcb3b17053a8
> --- /dev/null
> +++ b/arch/loongarch/include/asm/perf_event.h
> @@ -0,0 +1,10 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Author: Huacai Chen <chenhuacai@...ngson.cn>
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LOONGARCH_PERF_EVENT_H__
> +#define __LOONGARCH_PERF_EVENT_H__
> +/* Nothing to show here; the file is required by linux/perf_event.h. */
> +#endif /* __LOONGARCH_PERF_EVENT_H__ */
> diff --git a/arch/loongarch/include/asm/prefetch.h b/arch/loongarch/include/asm/prefetch.h
> new file mode 100644
> index 000000000000..1672262a5e2e
> --- /dev/null
> +++ b/arch/loongarch/include/asm/prefetch.h
> @@ -0,0 +1,29 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef __ASM_PREFETCH_H
> +#define __ASM_PREFETCH_H
> +
> +#define Pref_Load 0
> +#define Pref_Store 8
> +
> +#ifdef __ASSEMBLY__
> +
> + .macro __pref hint addr
> +#ifdef CONFIG_CPU_HAS_PREFETCH
> + preld \hint, \addr, 0
> +#endif
> + .endm
> +
> + .macro pref_load addr
> + __pref Pref_Load, \addr
> + .endm
> +
> + .macro pref_store addr
> + __pref Pref_Store, \addr
> + .endm
> +
> +#endif
> +
> +#endif /* __ASM_PREFETCH_H */
> diff --git a/arch/loongarch/include/asm/serial.h b/arch/loongarch/include/asm/serial.h
> new file mode 100644
> index 000000000000..3fb550eb9115
> --- /dev/null
> +++ b/arch/loongarch/include/asm/serial.h
> @@ -0,0 +1,11 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef __ASM__SERIAL_H
> +#define __ASM__SERIAL_H
> +
> +#define BASE_BAUD 0
> +#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
> +
> +#endif /* __ASM__SERIAL_H */
> diff --git a/arch/loongarch/include/asm/time.h b/arch/loongarch/include/asm/time.h
> new file mode 100644
> index 000000000000..2eae219301d0
> --- /dev/null
> +++ b/arch/loongarch/include/asm/time.h
> @@ -0,0 +1,50 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_TIME_H
> +#define _ASM_TIME_H
> +
> +#include <linux/clockchips.h>
> +#include <linux/clocksource.h>
> +#include <asm/loongarch.h>
> +
> +extern u64 cpu_clock_freq;
> +extern u64 const_clock_freq;
> +
> +extern void sync_counter(void);
> +
> +static inline unsigned int calc_const_freq(void)
> +{
> + unsigned int res;
> + unsigned int base_freq;
> + unsigned int cfm, cfd;
> +
> + res = read_cpucfg(LOONGARCH_CPUCFG2);
> + if (!(res & CPUCFG2_LLFTP))
> + return 0;
> +
> + base_freq = read_cpucfg(LOONGARCH_CPUCFG4);
> + res = read_cpucfg(LOONGARCH_CPUCFG5);
> + cfm = res & 0xffff;
> + cfd = (res >> 16) & 0xffff;
> +
> + if (!base_freq || !cfm || !cfd)
> + return 0;
> +
> + return (base_freq * cfm / cfd);
> +}
> +
> +/*
> + * Initialize the calling CPU's timer interrupt as clockevent device
> + */
> +extern int constant_clockevent_init(void);
> +extern int constant_clocksource_init(void);
> +
> +static inline void clockevent_set_clock(struct clock_event_device *cd,
> + unsigned int clock)
> +{
> + clockevents_calc_mult_shift(cd, clock, 4);
> +}
> +
> +#endif /* _ASM_TIME_H */
> diff --git a/arch/loongarch/include/asm/timex.h b/arch/loongarch/include/asm/timex.h
> new file mode 100644
> index 000000000000..d3ed99a4fdbd
> --- /dev/null
> +++ b/arch/loongarch/include/asm/timex.h
> @@ -0,0 +1,33 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_TIMEX_H
> +#define _ASM_TIMEX_H
> +
> +#ifdef __KERNEL__
> +
> +#include <linux/compiler.h>
> +
> +#include <asm/cpu.h>
> +#include <asm/cpu-features.h>
> +
> +/*
> + * Standard way to access the cycle counter.
> + * Currently only used on SMP for scheduling.
> + *
> + * We know that all SMP capable CPUs have cycle counters.
> + */
> +
> +typedef unsigned long cycles_t;
> +
> +#define get_cycles get_cycles
> +
> +static inline cycles_t get_cycles(void)
> +{
> + return drdtime();
> +}
> +
> +#endif /* __KERNEL__ */
> +
> +#endif /* _ASM_TIMEX_H */
> diff --git a/arch/loongarch/include/asm/topology.h b/arch/loongarch/include/asm/topology.h
> new file mode 100644
> index 000000000000..9ac71a25207a
> --- /dev/null
> +++ b/arch/loongarch/include/asm/topology.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef __ASM_TOPOLOGY_H
> +#define __ASM_TOPOLOGY_H
> +
> +#include <linux/smp.h>
> +
> +#define cpu_logical_map(cpu) 0
> +
> +#include <asm-generic/topology.h>
> +
> +static inline void arch_fix_phys_package_id(int num, u32 slot) { }
> +#endif /* __ASM_TOPOLOGY_H */
> diff --git a/arch/loongarch/include/asm/types.h b/arch/loongarch/include/asm/types.h
> new file mode 100644
> index 000000000000..baf15a0dcf8b
> --- /dev/null
> +++ b/arch/loongarch/include/asm/types.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_TYPES_H
> +#define _ASM_TYPES_H
> +
> +#include <asm-generic/int-ll64.h>
> +#include <uapi/asm/types.h>
> +
> +#ifdef __ASSEMBLY__
> +#define _ULCAST_
> +#define _U64CAST_
> +#else
> +#define _ULCAST_ (unsigned long)
> +#define _U64CAST_ (u64)
> +#endif
> +
> +#endif /* _ASM_TYPES_H */
> diff --git a/arch/loongarch/include/uapi/asm/bitsperlong.h b/arch/loongarch/include/uapi/asm/bitsperlong.h
> new file mode 100644
> index 000000000000..00b4ba1e5cdf
> --- /dev/null
> +++ b/arch/loongarch/include/uapi/asm/bitsperlong.h
> @@ -0,0 +1,9 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +#ifndef __ASM_LOONGARCH_BITSPERLONG_H
> +#define __ASM_LOONGARCH_BITSPERLONG_H
> +
> +#define __BITS_PER_LONG (__SIZEOF_LONG__ * 8)
> +
> +#include <asm-generic/bitsperlong.h>
> +
> +#endif /* __ASM_LOONGARCH_BITSPERLONG_H */
> diff --git a/arch/loongarch/include/uapi/asm/byteorder.h b/arch/loongarch/include/uapi/asm/byteorder.h
> new file mode 100644
> index 000000000000..b1722d890deb
> --- /dev/null
> +++ b/arch/loongarch/include/uapi/asm/byteorder.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
> +/*
> + * Author: Hanlu Li <lihanlu@...ngson.cn>
> + * Huacai Chen <chenhuacai@...ngson.cn>
> + *
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_BYTEORDER_H
> +#define _ASM_BYTEORDER_H
> +
> +#include <linux/byteorder/little_endian.h>
> +
> +#endif /* _ASM_BYTEORDER_H */
> diff --git a/arch/loongarch/include/uapi/asm/reg.h b/arch/loongarch/include/uapi/asm/reg.h
> new file mode 100644
> index 000000000000..90ad910c60eb
> --- /dev/null
> +++ b/arch/loongarch/include/uapi/asm/reg.h
> @@ -0,0 +1,59 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * Various register offset definitions for debuggers, core file
> + * examiners and whatnot.
> + *
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __UAPI_ASM_LOONGARCH_REG_H
> +#define __UAPI_ASM_LOONGARCH_REG_H
> +
> +#define LOONGARCH_EF_R0 0
> +#define LOONGARCH_EF_R1 1
> +#define LOONGARCH_EF_R2 2
> +#define LOONGARCH_EF_R3 3
> +#define LOONGARCH_EF_R4 4
> +#define LOONGARCH_EF_R5 5
> +#define LOONGARCH_EF_R6 6
> +#define LOONGARCH_EF_R7 7
> +#define LOONGARCH_EF_R8 8
> +#define LOONGARCH_EF_R9 9
> +#define LOONGARCH_EF_R10 10
> +#define LOONGARCH_EF_R11 11
> +#define LOONGARCH_EF_R12 12
> +#define LOONGARCH_EF_R13 13
> +#define LOONGARCH_EF_R14 14
> +#define LOONGARCH_EF_R15 15
> +#define LOONGARCH_EF_R16 16
> +#define LOONGARCH_EF_R17 17
> +#define LOONGARCH_EF_R18 18
> +#define LOONGARCH_EF_R19 19
> +#define LOONGARCH_EF_R20 20
> +#define LOONGARCH_EF_R21 21
> +#define LOONGARCH_EF_R22 22
> +#define LOONGARCH_EF_R23 23
> +#define LOONGARCH_EF_R24 24
> +#define LOONGARCH_EF_R25 25
> +#define LOONGARCH_EF_R26 26
> +#define LOONGARCH_EF_R27 27
> +#define LOONGARCH_EF_R28 28
> +#define LOONGARCH_EF_R29 29
> +#define LOONGARCH_EF_R30 30
> +#define LOONGARCH_EF_R31 31
> +
> +/*
> + * Saved special registers
> + */
> +#define LOONGARCH_EF_ORIG_A0 32
> +#define LOONGARCH_EF_CSR_ERA 33
> +#define LOONGARCH_EF_CSR_BADV 34
> +#define LOONGARCH_EF_CSR_CRMD 35
> +#define LOONGARCH_EF_CSR_PRMD 36
> +#define LOONGARCH_EF_CSR_EUEN 37
> +#define LOONGARCH_EF_CSR_ECFG 38
> +#define LOONGARCH_EF_CSR_ESTAT 39
> +
> +#define LOONGARCH_EF_SIZE 320 /* size in bytes */
> +
> +#endif /* __UAPI_ASM_LOONGARCH_REG_H */
> diff --git a/tools/include/uapi/asm/bitsperlong.h b/tools/include/uapi/asm/bitsperlong.h
> index edba4d93e9e6..da5206517158 100644
> --- a/tools/include/uapi/asm/bitsperlong.h
> +++ b/tools/include/uapi/asm/bitsperlong.h
> @@ -17,6 +17,8 @@
> #include "../../../arch/riscv/include/uapi/asm/bitsperlong.h"
> #elif defined(__alpha__)
> #include "../../../arch/alpha/include/uapi/asm/bitsperlong.h"
> +#elif defined(__loongarch__)
> +#include "../../../arch/loongarch/include/uapi/asm/bitsperlong.h"
> #else
> #include <asm-generic/bitsperlong.h>
> #endif
Apart from the nit:
Reviewed-by: WANG Xuerui <git@...0n.name>
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