riscv: Use Qemu and update to ISA v1.10

- remove Spike/BBL support in favour of Qemu (>=4.2.1)
- add 'riscv_qemu' board, remove 'spike' board'
- update to privileged ISA v1.10 (from v1.9.1)
- use direct system calls for privileged core threads (they call into
  the kernel and don't use mode changing system calls, i.e. 'ecall',
  semantics)
- use 'OpenSBI' semtantics for SBI calls (to machine mode) instead of
  BBL

issue #4012

tool/builddir/build.conf/run_riscv

@@ -1,9 +1,11 @@
+# local variable for run-tool arguments used for running scenarios in Qemu
+QEMU_RUN_OPT := --include power_on/qemu  --include log/qemu
+
 # kernel to use
 KERNEL ?= hw
 
-# board to use
-BOARD  ?= spike
+# board to use (riscv_qemu)
+BOARD  ?= riscv_qemu
 
 # local variable for run-tool arguments that depend on the used board
-BOARD_RUN_OPT(spike) = --include image/bbl --include power_on/spike --include log/spike
-
+BOARD_RUN_OPT(riscv_qemu) = $(QEMU_RUN_OPT)

tool/run/image/bbl

@@ -1,6 +0,0 @@
-proc run_image {elf_img} {
-	puts "using '$elf_img' as bbl image"
-
-	exec rm -f bbl/image.o
-	exec -ignorestderr make IMAGE_ELF=[pwd]/$elf_img bbl
-}

tool/run/log/spike

@@ -1,34 +0,0 @@
-
-source [genode_dir]/tool/run/log.inc
-source [genode_dir]/tool/run/spike.inc
-
-
-proc run_log { wait_for_re timeout_value } {
-	global spike_spawn_id
-	global output_spawn_id
-
-	set kernel_msg [run_boot_string]
-	set output_spawn_id $spike_spawn_id
-
-	if {$wait_for_re == "forever"} {
-		set timeout -1
-	} else {
-		set timeout $timeout_value
-	}
-
-	expect {
-		-i $output_spawn_id $kernel_msg { }
-		eof         {
-			puts stderr "Aborting, received EOF"
-			return false
-		}
-		timeout     {
-			puts stderr "Boot process timed out"
-			close
-			return false
-		}
-	}
-
-	wait_for_output $wait_for_re $timeout_value $spike_spawn_id
-	return true
-}

tool/run/power_on/qemu

@@ -52,6 +52,7 @@ proc run_power_on { } {
 	if {[have_spec x86_64]} { set qemu "qemu-system-x86_64" }
 	if {[have_spec arm]}    { set qemu "qemu-system-arm" }
 	if {[have_spec arm_64]} { set qemu "qemu-system-aarch64" }
+	if {[have_spec riscv]}  { set qemu "qemu-system-riscv64" }
 
 	#
 	# Only the x86_64 variant of Qemu provides the emulation of hardware
@@ -155,8 +156,14 @@ proc run_power_on { } {
 		append qemu_args " -machine q35 "
 	}
 
-	# on ARM, we supply the boot image as kernel
-	if {[have_spec arm] || [have_spec arm_v8]} { append qemu_args " -kernel [run_dir]/boot/image.elf " }
+	if {[have_board riscv_qemu]} {
+		append qemu_args " -m 128 -machine virt -cpu rv64,priv_spec=v1.10.0 "
+		append qemu_args " -bios default "
+	}
+
+	# on ARM/RISC-V, we supply the boot image as kernel
+	if {[have_spec arm] || [have_spec arm_v8] || [have_spec riscv]} {
+		append qemu_args " -kernel [run_dir]/boot/image.elf " }
 
 	eval spawn $qemu $qemu_args
 	set qemu_spawn_id $spawn_id

tool/run/power_on/spike

@@ -1,28 +0,0 @@
-##
-# Execute scenario using spike
-#
-source [genode_dir]/tool/run/spike.inc
-
-proc is_spike_available { } {
-
-	if {[have_spec riscv]} { return true }
-
-	puts stderr "skipping execution because platform is not supported by spike"
-	return false
-}
-
-proc run_power_on { } {
-	global spike_args
-	global spike
-	global spike_spawn_id
-
-	if {![is_spike_available]} { return 0 }
-
-	append spike_args "-m128 [pwd]/debug/bbl "
-
-	set spike "spike"
-	eval spawn $spike $spike_args
-	set spike_spawn_id $spawn_id
-
-	return true
-}

tool/run/spike.inc

@@ -1 +0,0 @@
-set spike_spawn_id ""