LoongArch: Add other common headers

Add some other common headers for basic LoongArch support.

Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

18 files changed, 917 insertions, 0 deletions

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..40eea6aa469e
--- /dev/null
+++ b/arch/loongarch/include/asm/asm.h
@@ -0,0 +1,191 @@
+/* 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 */
+
+/*
+ * 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
+
+#ifdef __ASSEMBLY__
+#define PTR		.word
+#endif
+#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
+
+#ifdef __ASSEMBLY__
+#define PTR		.dword
+#endif
+#define PTRSIZE		8
+#define PTRLOG		3
+#endif
+
+#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@loongson.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@loongson.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@loongson.cn>
+ *         Huacai Chen <chenhuacai@loongson.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