From 7fcb82665e96a50174084c8bfcd0302ce31291f4 Mon Sep 17 00:00:00 2001
From: Weijie Gao <hackpascal@gmail.com>
Date: Sun, 7 Jan 2024 03:10:45 +0800
Subject: loongarch64: new target

Add target for Loongson LoongArch64-based boards.

LoongArch is a new RISC ISA developed by Loongson. It's a bit like
MIPS or RISC-V. LoongArch includes both 32-bit and 64-bit versions
(LoongArch32/LoongArch64).

Loongson 3A5000 and 3A6000 are the two existing CPUs of LoongArch64
and is used for PC products. It's BIOS supports ACPI and UEFI-only
boot. These CPUs supports SMP and SMT.

At present only LoongArch64 is supported by linux kernel.

Toolchain requirement:
binutils >= 2.40
gcc >= 13.1

For details, please check the following links:
https://lwn.net/Articles/861951/
https://loongson.github.io/LoongArch-Documentation/README-EN.html

Signed-off-by: Weijie Gao <hackpascal@gmail.com>
---
 include/kernel.mk        |  2 ++
 include/site/loongarch64 | 30 ++++++++++++++++++++++++++++++
 include/target.mk        |  5 +++++
 3 files changed, 37 insertions(+)
 create mode 100644 include/site/loongarch64

(limited to 'include')

diff --git a/include/kernel.mk b/include/kernel.mk
index 479c586ea2..6ef766388a 100644
--- a/include/kernel.mk
+++ b/include/kernel.mk
@@ -86,6 +86,8 @@ else ifneq (,$(findstring $(ARCH) , arceb ))
   LINUX_KARCH := arc
 else ifneq (,$(findstring $(ARCH) , armeb ))
   LINUX_KARCH := arm
+else ifneq (,$(findstring $(ARCH) , loongarch64 ))
+  LINUX_KARCH := loongarch
 else ifneq (,$(findstring $(ARCH) , mipsel mips64 mips64el ))
   LINUX_KARCH := mips
 else ifneq (,$(findstring $(ARCH) , powerpc64 ))
diff --git a/include/site/loongarch64 b/include/site/loongarch64
new file mode 100644
index 0000000000..b8d581d448
--- /dev/null
+++ b/include/site/loongarch64
@@ -0,0 +1,30 @@
+#!/bin/sh
+. $TOPDIR/include/site/linux
+ac_cv_c_littleendian=${ac_cv_c_littleendian=yes}
+ac_cv_c_bigendian=${ac_cv_c_bigendian=no}
+
+ac_cv_sizeof___int64=0
+ac_cv_sizeof_char=1
+ac_cv_sizeof_int=4
+ac_cv_sizeof_int16_t=2
+ac_cv_sizeof_int32_t=4
+ac_cv_sizeof_int64_t=8
+ac_cv_sizeof_long_int=8
+ac_cv_sizeof_long_long=8
+ac_cv_sizeof_long=8
+ac_cv_sizeof_off_t=8
+ac_cv_sizeof_short_int=2
+ac_cv_sizeof_short=2
+ac_cv_sizeof_size_t=8
+ac_cv_sizeof_ssize_t=8
+ac_cv_sizeof_u_int16_t=2
+ac_cv_sizeof_u_int32_t=4
+ac_cv_sizeof_u_int64_t=8
+ac_cv_sizeof_uint16_t=2
+ac_cv_sizeof_uint32_t=4
+ac_cv_sizeof_uint64_t=8
+ac_cv_sizeof_unsigned_int=4
+ac_cv_sizeof_unsigned_long=8
+ac_cv_sizeof_unsigned_long_long=8
+ac_cv_sizeof_unsigned_short=2
+ac_cv_sizeof_void_p=8
diff --git a/include/target.mk b/include/target.mk
index b5e3e7ff6f..68558601f3 100644
--- a/include/target.mk
+++ b/include/target.mk
@@ -264,6 +264,11 @@ ifeq ($(DUMP),1)
     CPU_TYPE ?= riscv64
     CPU_CFLAGS_riscv64:=-mabi=lp64d -march=rv64imafdc
   endif
+  ifeq ($(ARCH),loongarch64)
+    CPU_TYPE ?= generic
+    CPU_CFLAGS := -O2 -pipe
+    CPU_CFLAGS_generic:=-march=loongarch64
+  endif
   ifneq ($(CPU_TYPE),)
     ifndef CPU_CFLAGS_$(CPU_TYPE)
       $(warning CPU_TYPE "$(CPU_TYPE)" doesn't correspond to a known type)
-- 
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