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platform/qemu/virt: Dynamically calculate xlen

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The QEMU virt machine can be either 32 or 66 bit. Don't hard code the
CPU bit length and instead let the compiler determine it.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Alistair Francis 2019-01-17 17:33:47 -08:00 • committed by Anup Patel
parent b4c72deba9
commit 5a91fec1a8
3 changed files with 16 additions and 2 deletions
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3
Makefile
View file

@ -116,6 +116,9 @@ endif
AS = $(CC)
DTC = dtc
# Guess the compillers xlen
OPENSBI_CC_XLEN = `expr substr \`$(CC) -dumpmachine\` 6 2`
# Setup compilation commands flags
CFLAGS = -g -Wall -Werror -nostdlib -fno-strict-aliasing -O2
CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls

13
platform/qemu/virt/config.mk
View file

@ -9,8 +9,17 @@
# Compiler flags
platform-cppflags-y =
platform-cflags-y =-mabi=lp64 -march=rv64imafdc -mcmodel=medany
platform-asflags-y =-mabi=lp64 -march=rv64imafdc -mcmodel=medany
# If we know the compillers xlen use it below
ifeq ($(OPENSBI_CC_XLEN), 32)
platform-cflags-y =-mabi=ilp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc
platform-asflags-y =-mabi=ilp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc
endif
ifeq ($(OPENSBI_CC_XLEN), 64)
platform-cflags-y =-mabi=lp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc
platform-asflags-y =-mabi=lp$(OPENSBI_CC_XLEN) -march=rv$(OPENSBI_CC_XLEN)imafdc
endif
platform-cflags-y += -mcmodel=medany
platform-asflags-y += -mcmodel=medany
platform-ldflags-y =
# Common drivers to enable

2
platform/template/config.mk
View file

@ -12,6 +12,8 @@ platform-cppflags-y =
# -mabi=lp64 -march=rv64imafdc -mcmodel=medany
# For a 32 bits platform, this will likely be:
# -mabi=lp32 -march=rv32imafdc -mcmodel=medlow
# You can also use the Makefile variable OPENSBI_CC_XLEN for the xlen
# See the QEMU virt machine for an example of this
platform-cflags-y = -mabi=lp64 -march=rv64imafdc -mcmodel=medany
platform-asflags-y = -mabi=lp64 -march=rv64imafdc -mcmodel=medany