Implement hcall based RTAS for pSeries machines

On pSeries machines, operating systems can instantiate "RTAS" (Run-Time
Abstraction Services), a runtime component of the firmware which implements
a number of low-level, infrequently used operations.  On logical partitions
under a hypervisor, many of the RTAS functions require hypervisor
privilege.  For simplicity, therefore, hypervisor systems typically
implement the in-partition RTAS as just a tiny wrapper around a hypercall
which actually implements the various RTAS functions.

This patch implements such a hypercall based RTAS for our emulated pSeries
machine.  A tiny in-partition "firmware" calls a new hypercall, which
looks up available RTAS services in a table.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 24 insertions, 0 deletions

diff --git a/pc-bios/spapr-rtas/Makefile b/pc-bios/spapr-rtas/Makefile
new file mode 100644
index 0000000000..dc8b23e3ce
--- /dev/null
+++ b/pc-bios/spapr-rtas/Makefile
@@ -0,0 +1,24 @@
+all: build-all
+# Dummy command so that make thinks it has done something
+	@true
+
+include ../../config-host.mak
+include $(SRC_PATH)/rules.mak
+
+$(call set-vpath, $(SRC_PATH)/pc-bios/spapr-rtas)
+
+.PHONY : all clean build-all
+
+#CFLAGS += -I$(SRC_PATH)
+#QEMU_CFLAGS = $(CFLAGS)
+
+build-all: spapr-rtas.bin
+
+%.img: %.o
+	$(call quiet-command,$(CC) -nostdlib -o $@ $<,"  Building $(TARGET_DIR)$@")
+
+%.bin: %.img
+	$(call quiet-command,$(OBJCOPY) -O binary -j .text $< $@,"  Building $(TARGET_DIR)$@")
+
+clean:
+	rm -f *.o *.d *.img *.bin *~