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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v7 2/2] xen: Add files needed for minimal riscv build
Add arch-specific makefiles and configs needed to build for
riscv. Also add a minimal head.S that is a simple infinite loop.
head.o can be built with
$ make XEN_TARGET_ARCH=riscv64 SUBSYSTEMS=xen -C xen tiny64_defconfig
$ make XEN_TARGET_ARCH=riscv64 SUBSYSTEMS=xen -C xen TARGET=riscv64/head.o
No other TARGET is supported at the moment.
Signed-off-by: Connor Davis <connojdavis@xxxxxxxxx>
---
Bob: I moved back to XEN_TARGET_ARCH=riscv64 because supplying
just XEN_TARGET_ARCH=riscv causes TARGET_ARCH == TARGET_SUBARCH, and
that broke the build after the recent commit b6ecd5c8bc
"build: centralize / unify asm-offsets generation". It also deviates
from how x86 and arm work now, so I think this change is for the best
for now. That commit is also why the PHONY include target is added
in the riscv/Makefile.
---
MAINTAINERS | 8 +++++
config/riscv64.mk | 5 +++
xen/Makefile | 8 +++--
xen/arch/riscv/Kconfig | 47 +++++++++++++++++++++++++
xen/arch/riscv/Kconfig.debug | 0
xen/arch/riscv/Makefile | 2 ++
xen/arch/riscv/Rules.mk | 0
xen/arch/riscv/arch.mk | 14 ++++++++
xen/arch/riscv/configs/tiny64_defconfig | 13 +++++++
xen/arch/riscv/riscv64/asm-offsets.c | 0
xen/arch/riscv/riscv64/head.S | 6 ++++
xen/include/asm-riscv/config.h | 47 +++++++++++++++++++++++++
12 files changed, 148 insertions(+), 2 deletions(-)
create mode 100644 config/riscv64.mk
create mode 100644 xen/arch/riscv/Kconfig
create mode 100644 xen/arch/riscv/Kconfig.debug
create mode 100644 xen/arch/riscv/Makefile
create mode 100644 xen/arch/riscv/Rules.mk
create mode 100644 xen/arch/riscv/arch.mk
create mode 100644 xen/arch/riscv/configs/tiny64_defconfig
create mode 100644 xen/arch/riscv/riscv64/asm-offsets.c
create mode 100644 xen/arch/riscv/riscv64/head.S
create mode 100644 xen/include/asm-riscv/config.h
diff --git a/MAINTAINERS b/MAINTAINERS
index d46b08a0d2..956e71220d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -456,6 +456,14 @@ F: tools/libs/light/libxl_nonetbuffer.c
F: tools/hotplug/Linux/remus-netbuf-setup
F: tools/hotplug/Linux/block-drbd-probe
+RISCV
+M: Bob Eshleman <bobbyeshleman@xxxxxxxxx>
+R: Connor Davis <connojdavis@xxxxxxxxx>
+S: Supported
+F: config/riscv64.mk
+F: xen/arch/riscv/
+F: xen/include/asm-riscv/
+
RTDS SCHEDULER
M: Dario Faggioli <dfaggioli@xxxxxxxx>
M: Meng Xu <mengxu@xxxxxxxxxxxxx>
diff --git a/config/riscv64.mk b/config/riscv64.mk
new file mode 100644
index 0000000000..a5a21e5fa2
--- /dev/null
+++ b/config/riscv64.mk
@@ -0,0 +1,5 @@
+CONFIG_RISCV := y
+CONFIG_RISCV_64 := y
+CONFIG_RISCV_$(XEN_OS) := y
+
+CONFIG_XEN_INSTALL_SUFFIX :=
diff --git a/xen/Makefile b/xen/Makefile
index 7ce7692354..89879fad4c 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -26,7 +26,9 @@ MAKEFLAGS += -rR
EFI_MOUNTPOINT ?= $(BOOT_DIR)/efi
ARCH=$(XEN_TARGET_ARCH)
-SRCARCH=$(shell echo $(ARCH) | sed -e 's/x86.*/x86/' -e
s'/arm\(32\|64\)/arm/g')
+SRCARCH=$(shell echo $(ARCH) | \
+ sed -e 's/x86.*/x86/' -e s'/arm\(32\|64\)/arm/g' \
+ -e s'/riscv.*/riscv/g')
# Don't break if the build process wasn't called from the top level
# we need XEN_TARGET_ARCH to generate the proper config
@@ -35,7 +37,8 @@ include $(XEN_ROOT)/Config.mk
# Set ARCH/SUBARCH appropriately.
export TARGET_SUBARCH := $(XEN_TARGET_ARCH)
export TARGET_ARCH := $(shell echo $(XEN_TARGET_ARCH) | \
- sed -e 's/x86.*/x86/' -e s'/arm\(32\|64\)/arm/g')
+ sed -e 's/x86.*/x86/' -e s'/arm\(32\|64\)/arm/g' \
+ -e s'/riscv.*/riscv/g')
# Allow someone to change their config file
export KCONFIG_CONFIG ?= .config
@@ -335,6 +338,7 @@ _clean: delete-unfresh-files
$(MAKE) $(clean) xsm
$(MAKE) $(clean) crypto
$(MAKE) $(clean) arch/arm
+ $(MAKE) $(clean) arch/riscv
$(MAKE) $(clean) arch/x86
$(MAKE) $(clean) test
$(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig ARCH=$(ARCH)
SRCARCH=$(SRCARCH) clean
diff --git a/xen/arch/riscv/Kconfig b/xen/arch/riscv/Kconfig
new file mode 100644
index 0000000000..bd8381c5e0
--- /dev/null
+++ b/xen/arch/riscv/Kconfig
@@ -0,0 +1,47 @@
+config RISCV
+ def_bool y
+
+config RISCV_64
+ def_bool y
+ select 64BIT
+
+config ARCH_DEFCONFIG
+ string
+ default "arch/riscv/configs/tiny64_defconfig"
+
+menu "Architecture Features"
+
+source "arch/Kconfig"
+
+endmenu
+
+menu "ISA Selection"
+
+choice
+ prompt "Base ISA"
+ default RISCV_ISA_RV64IMA if RISCV_64
+ help
+ This selects the base ISA extensions that Xen will target.
+
+config RISCV_ISA_RV64IMA
+ bool "RV64IMA"
+ help
+ Use the RV64I base ISA, plus the "M" and "A" extensions
+ for integer multiply/divide and atomic instructions, respectively.
+
+endchoice
+
+config RISCV_ISA_C
+ bool "Compressed extension"
+ help
+ Add "C" to the ISA subsets that the toolchain is allowed to
+ emit when building Xen, which results in compressed instructions
+ in the Xen binary.
+
+ If unsure, say N.
+
+endmenu
+
+source "common/Kconfig"
+
+source "drivers/Kconfig"
diff --git a/xen/arch/riscv/Kconfig.debug b/xen/arch/riscv/Kconfig.debug
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/xen/arch/riscv/Makefile b/xen/arch/riscv/Makefile
new file mode 100644
index 0000000000..942e4ffbc1
--- /dev/null
+++ b/xen/arch/riscv/Makefile
@@ -0,0 +1,2 @@
+.PHONY: include
+include:
diff --git a/xen/arch/riscv/Rules.mk b/xen/arch/riscv/Rules.mk
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/xen/arch/riscv/arch.mk b/xen/arch/riscv/arch.mk
new file mode 100644
index 0000000000..53dadb8975
--- /dev/null
+++ b/xen/arch/riscv/arch.mk
@@ -0,0 +1,14 @@
+########################################
+# RISCV-specific definitions
+
+CFLAGS-$(CONFIG_RISCV_64) += -mabi=lp64
+
+riscv-march-$(CONFIG_RISCV_ISA_RV64IMA) := rv64ima
+riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c
+
+# Note that -mcmodel=medany is used so that Xen can be mapped
+# into the upper half _or_ the lower half of the address space.
+# -mcmodel=medlow would force Xen into the lower half.
+
+CFLAGS += -march=$(riscv-march-y) -mstrict-align -mcmodel=medany
+CFLAGS += -I$(BASEDIR)/include
diff --git a/xen/arch/riscv/configs/tiny64_defconfig
b/xen/arch/riscv/configs/tiny64_defconfig
new file mode 100644
index 0000000000..3c9a2ff941
--- /dev/null
+++ b/xen/arch/riscv/configs/tiny64_defconfig
@@ -0,0 +1,13 @@
+# CONFIG_SCHED_CREDIT is not set
+# CONFIG_SCHED_RTDS is not set
+# CONFIG_SCHED_NULL is not set
+# CONFIG_SCHED_ARINC653 is not set
+# CONFIG_TRACEBUFFER is not set
+# CONFIG_HYPFS is not set
+# CONFIG_GRANT_TABLE is not set
+# CONFIG_SPECULATIVE_HARDEN_ARRAY is not set
+
+CONFIG_RISCV_64=y
+CONFIG_DEBUG=y
+CONFIG_DEBUG_INFO=y
+CONFIG_EXPERT=y
diff --git a/xen/arch/riscv/riscv64/asm-offsets.c
b/xen/arch/riscv/riscv64/asm-offsets.c
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/xen/arch/riscv/riscv64/head.S b/xen/arch/riscv/riscv64/head.S
new file mode 100644
index 0000000000..0dbc27ba75
--- /dev/null
+++ b/xen/arch/riscv/riscv64/head.S
@@ -0,0 +1,6 @@
+#include <asm/config.h>
+
+ .text
+
+ENTRY(start)
+ j start
diff --git a/xen/include/asm-riscv/config.h b/xen/include/asm-riscv/config.h
new file mode 100644
index 0000000000..e2ae21de61
--- /dev/null
+++ b/xen/include/asm-riscv/config.h
@@ -0,0 +1,47 @@
+#ifndef __RISCV_CONFIG_H__
+#define __RISCV_CONFIG_H__
+
+#if defined(CONFIG_RISCV_64)
+# define LONG_BYTEORDER 3
+# define ELFSIZE 64
+# define MAX_VIRT_CPUS 128u
+#else
+# error "Unsupported RISCV variant"
+#endif
+
+#define BYTES_PER_LONG (1 << LONG_BYTEORDER)
+#define BITS_PER_LONG (BYTES_PER_LONG << 3)
+#define POINTER_ALIGN BYTES_PER_LONG
+
+#define BITS_PER_LLONG 64
+
+/* xen_ulong_t is always 64 bits */
+#define BITS_PER_XEN_ULONG 64
+
+#define CONFIG_RISCV_L1_CACHE_SHIFT 6
+#define CONFIG_PAGEALLOC_MAX_ORDER 18
+#define CONFIG_DOMU_MAX_ORDER 9
+#define CONFIG_HWDOM_MAX_ORDER 10
+
+#define OPT_CONSOLE_STR "dtuart"
+#define INVALID_VCPU_ID MAX_VIRT_CPUS
+
+/* Linkage for RISCV */
+#ifdef __ASSEMBLY__
+#define ALIGN .align 2
+
+#define ENTRY(name) \
+ .globl name; \
+ ALIGN; \
+ name:
+#endif
+
+#endif /* __RISCV_CONFIG_H__ */
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
2.31.1
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