hw/core: loader: Set is_linux to true for VxWorks uImage

VxWorks 7 uses the same boot interface as the Linux kernel on Arm
(64-bit only), PowerPC and RISC-V architectures. Add logic to set
is_linux to true for VxWorks uImage for these architectures in
load_uboot_image().

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20220324134812.541274-2-bmeng.cn@gmail.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

hw/core/loader.c

@@ -696,6 +696,21 @@ static int load_uboot_image(const char *filename, hwaddr *ep, hwaddr *loadaddr,
         if (is_linux) {
             if (hdr->ih_os == IH_OS_LINUX) {
                 *is_linux = 1;
+            } else if (hdr->ih_os == IH_OS_VXWORKS) {
+                /*
+                 * VxWorks 7 uses the same boot interface as the Linux kernel
+                 * on Arm (64-bit only), PowerPC and RISC-V architectures.
+                 */
+                switch (hdr->ih_arch) {
+                case IH_ARCH_ARM64:
+                case IH_ARCH_PPC:
+                case IH_ARCH_RISCV:
+                    *is_linux = 1;
+                    break;
+                default:
+                    *is_linux = 0;
+                    break;
+                }
             } else {
                 *is_linux = 0;
             }