recipes-bsp: u-boot: add mechanism to boot xen

This patch provides a custom CONFIG_BOOTCOMMAND when user has enabled
xen under DISTRO_FEATURES. This bootcommand runs a script from boot
partition, which is boot.scr by default.

The script is also provided and is compiled using mkimage as a FIT
image. This script loads the Xen image, the kernel image and the FDT
and then modifies the FDT to allow suitable Xen configuration and other
features like shared memory and UIO.

Signed-off-by: Amneesh Singh <a-singh21@ti.com>

Author: Amneesh Singh

recipes-bsp/u-boot/scripts/boot.xen.its

@@ -0,0 +1,19 @@
+/dts-v1/;
+/ {
+    description = "Configuration from Imagebuilder to load Xen/Linux";
+    #address-cells = <1>;
+    images {
+        default = "boot_scr";
+        boot_scr {
+            description = "default xen boot script";
+            data = /incbin/("boot.xen.source");
+            type = "script";
+            compression = "none";
+            load = <0x82000000>;
+            entry = <0x82000000>;
+            hash {
+                algo = "md5";
+            };
+        };
+    };
+};

recipes-bsp/u-boot/scripts/boot.xen.source.in

@@ -0,0 +1,117 @@
+xen_name=@@XEN_IMAGE_NAME@@
+kernel_name=@@XEN_KERNEL_IMAGE_NAME@@
+
+xen_addr=@@XEN_ADDRESS@@
+kernel_addr=@@XEN_KERNEL_ADDRESS@@
+
+for boot_target in ${boot_targets};
+do
+  # only support searching mmc for now and break if kernel is scanned
+  if test -z "${kernel_size}" && test "${boot_target}" = "mmc0" || test "${boot_target}" = "mmc1"; then
+    setenv devtype mmc
+    setenv bootdir /boot
+    setenv dtbdir ${bootdir}/dtb
+
+    if test "${boot_target}" = "mmc0"; then
+      setenv devnum 0
+    elif test "${boot_target}" = "mmc1"; then
+      setenv devnum 1
+    fi
+
+    setenv loadboot ${devtype} ${devnum}:1
+    setenv loadroot ${devtype} ${devnum}:2
+
+    # check xen image in boot partition then root partition
+    if test -e ${loadboot} ${xen_name}; then
+      echo "Loading ${xen_name}";
+      fatload ${loadboot} ${xen_addr} ${xen_name};
+    elif test -e ${loadroot} ${bootdir}/${xen_name}; then
+      echo "Loading ${xen_name}";
+      load ${loadroot} ${xen_addr} ${bootdir}/${xen_name};
+    fi
+
+    # check kernel image in boot partition then root partition
+    if test -e ${loadboot} ${kernel_name}; then
+      echo "Loading ${kernel_name}";
+      fatload ${loadboot} ${kernel_addr} ${kernel_name};
+      setenv kernel_size 0x$filesize;
+    elif test -e ${loadroot} ${bootdir}/$kernel_name}; then
+      echo "Loading ${kernel_name}";
+      load ${loadroot} ${kernel_addr} ${bootdir}/${kernel_name};
+      setenv kernel_size 0x$filesize;
+    fi
+
+    # load fdt from root partition
+    if test -e ${loadroot} ${dtbdir}/${fdtfile}; then
+      echo "Loading ${dtbdir}/${fdtfile}";
+      load ${loadroot} ${fdtaddr} ${dtbdir}/${fdtfile};
+      part uuid ${loadroot} rootfs_partuuid
+    fi
+  fi
+done
+
+if test -z "${kernel_size}"; then
+  echo "No kernel image found"
+  exit
+fi
+
+fdt addr ${fdtaddr}
+fdt resize 0x1000
+setenv fdt_high 0xffffffffffffffff
+
+# fdt operations
+fdt set /chosen \#address-cells <0x2>
+fdt set /chosen \#size-cells <0x2>
+setenv xen_bootargs "console=dtuart dtuart=@@XEN_DTUART_SERIAL@@ dom0_mem=@@DOM0_MEM@@ dom0_max_vcpus=@@DOM0_MAX_VCPUS@@ bootscrub=0 vwfi=native"
+fdt set /chosen xen,xen-bootargs \"${xen_bootargs}\"
+
+fdt mknod /chosen dom0
+fdt set /chosen/dom0 compatible  "xen,linux-zimage" "xen,multiboot-module" "multiboot,module"
+fdt set /chosen/dom0 reg <0x0 ${kernel_addr} 0x0 ${kernel_size}>
+setenv dom0_bootargs "console=hvc0 earlyprintk=xen root=PARTUUID=${rootfs_partuuid} rw rootfstype=ext4 rootwait clk_ignore_unused"
+
+# shared memory
+if test -n "@@XEN_SHMEM_ID@@"; then
+  shmem_start=@@XEN_SHMEM_START@@
+  shmem_size=@@XEN_SHMEM_SIZE@@
+  shmem_node=xen_shmem@@@XEN_SHMEM_START@@
+  uio_node=xen_uio@@@XEN_SHMEM_START@@
+
+  # mark it as shared
+  fdt mknod /chosen ${shmem_node}
+  fdt set /chosen/${shmem_node} compatible "xen,domain-shared-memory-v1"
+  fdt set /chosen/${shmem_node} xen,shm-id "@@XEN_SHMEM_ID@@"
+  fdt set /chosen/${shmem_node} xen,shared-mem <0x00 ${shmem_start} 0x00 ${shmem_start} 0x00 ${shmem_size}>
+
+  # expose as UIO to Dom0
+  fdt mknod / ${uio_node}
+  fdt set /${uio_node} compatible @@XEN_SHMEM_UIO_NAME@@
+  fdt set /${uio_node} reg <0x00 ${shmem_start} 0x00 ${shmem_size}>
+
+  # append uio to bootargs
+  setenv dom0_bootargs "${dom0_bootargs} uio_pdrv_genirq.of_id=@@XEN_SHMEM_UIO_NAME@@"
+fi
+
+fdt set /chosen xen,dom0-bootargs \"${dom0_bootargs}\"
+
+# Specify interrupts explicitly for the following instead of relying on ti,interrupt-ranges
+for dev_path in @@XEN_IRQ_DEVICES@@; do
+  fdt get value irq_cur ${dev_path} ti,interrupt-ranges 0
+  fdt get value irq_num ${dev_path} ti,interrupt-ranges 2
+
+  setexpr irq_cur ${irq_cur} + 0x20
+  setexpr irq_end ${irq_cur} + ${irq_num}
+  setenv irq_prop "<"
+
+  while itest ${irq_cur} < ${irq_end}; do
+    setenv irq_prop "${irq_prop}0 0x${irq_cur} 4 "
+    setexpr irq_cur ${irq_cur} + 1
+  done
+
+  setenv irq_prop "${irq_prop}>"
+  fdt set ${dev_path} interrupts ${irq_prop}
+done
+
+echo "Booting"
+
+booti ${xen_addr} - ${fdtaddr}

recipes-bsp/u-boot/scripts/bootcommand.cfg

@@ -0,0 +1 @@
+CONFIG_BOOTCOMMAND="run envboot; setenv bootmeths 'script'; bootflow scan -lb"

recipes-bsp/u-boot/u-boot-ti-staging_%.bbappend

@@ -11,5 +11,7 @@ TI_DM="${STAGING_DIR_HOST}${nonarch_base_libdir}/firmware/ti-dm/${PLAT_SFX}/${DM
 
 EXTRA_OEMAKE += "TI_DM=${TI_DM}"
 
+include ${@bb.utils.contains('DISTRO_FEATURES', 'xen', 'u-boot-xen-scr.inc', '', d)}
+
 PR:append = "_tisdk_5"
 

recipes-bsp/u-boot/u-boot-xen-scr.inc

@@ -0,0 +1,47 @@
+FILESEXTRAPATHS:prepend := "${THISDIR}/scripts:"
+
+DEPENDS:append:k3 = " u-boot-mkimage-native"
+
+SRC_URI:append:k3 = " \
+    file://boot.xen.source.in \
+    file://boot.xen.its \
+    file://bootcommand.cfg \
+    "
+
+XEN_IMAGE_NAME ??= "xen"
+XEN_KERNEL_IMAGE_NAME ??= "Image"
+XEN_ADDRESS ??= "0x82040000"
+XEN_KERNEL_ADDRESS ??= "0x83000000"
+XEN_DTUART_SERIAL ??= "serial2"
+DOM0_MEM ??= "2G"
+DOM0_MAX_VCPUS ??= "1"
+XEN_SHMEM_ID ??= "xen-shmem"
+XEN_SHMEM_UIO_NAME ??= "xen-uio"
+XEN_SHMEM_START ??= "0x80000000"
+XEN_SHMEM_SIZE ??= "0x1000"
+
+XEN_IRQ_DEVICES ??= ""
+XEN_IRQ_DEVICES:am62pxx ??= "\/bus@f0000\/bus@48000000\/interrupt-controller@48000000"
+
+do_compile:append:k3() {
+    sed -e 's/@@XEN_IMAGE_NAME@@/${XEN_IMAGE_NAME}/' \
+        -e 's/@@XEN_KERNEL_IMAGE_NAME@@/${XEN_KERNEL_IMAGE_NAME}/' \
+        -e 's/@@XEN_ADDRESS@@/${XEN_ADDRESS}/' \
+        -e 's/@@XEN_KERNEL_ADDRESS@@/${XEN_KERNEL_ADDRESS}/' \
+        -e 's/@@XEN_DTUART_SERIAL@@/${XEN_DTUART_SERIAL}/' \
+        -e 's/@@DOM0_MEM@@/${DOM0_MEM}/' \
+        -e 's/@@DOM0_MAX_VCPUS@@/${DOM0_MAX_VCPUS}/' \
+        -e 's/@@XEN_IRQ_DEVICES@@/${XEN_IRQ_DEVICES}/' \
+        -e 's/@@XEN_SHMEM_ID@@/${XEN_SHMEM_ID}/' \
+        -e 's/@@XEN_SHMEM_UIO_NAME@@/${XEN_SHMEM_UIO_NAME}/' \
+        -e 's/@@XEN_SHMEM_START@@/${XEN_SHMEM_START}/' \
+        -e 's/@@XEN_SHMEM_SIZE@@/${XEN_SHMEM_SIZE}/' \
+        "${WORKDIR}/boot.xen.source.in" > "${WORKDIR}/boot.xen.source"
+
+    mkimage -f ${WORKDIR}/boot.xen.its ${WORKDIR}/boot.xen.scr
+}
+
+do_deploy:append:k3() {
+    install -d ${DEPLOYDIR}
+    install -m 0644 ${WORKDIR}/boot.xen.scr ${DEPLOYDIR}
+}