[Qemu-devel] [RFC 06/28] target-xtensa: add sample board

[Max Filippov <jcmvbkbc@gmail.com>]

Sample board and sample CPU core are used for debug and may be used for
development of custom SoC emulators.

This board has two fixed size memory regions for DTCM and ITCM and
variable length SRAM region.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
 Makefile.target    |    1 +
 hw/xtensa_sample.c |   68 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+), 0 deletions(-)
 create mode 100644 hw/xtensa_sample.c

diff --git a/Makefile.target b/Makefile.target
index 7e7afd2..8d6d081 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -367,6 +367,7 @@ obj-s390x-y = s390-virtio-bus.o s390-virtio.o
 obj-alpha-y = alpha_palcode.o
 
 obj-xtensa-y += xtensa_pic.o
+obj-xtensa-y += xtensa_sample.o
 
 main.o: QEMU_CFLAGS+=$(GPROF_CFLAGS)
 
diff --git a/hw/xtensa_sample.c b/hw/xtensa_sample.c
new file mode 100644
index 0000000..8103675
--- /dev/null
+++ b/hw/xtensa_sample.c
@@ -0,0 +1,68 @@
+#include "sysemu.h"
+#include "boards.h"
+#include "loader.h"
+#include "elf.h"
+
+static void xtensa_init(ram_addr_t ram_size,
+        const char *boot_device,
+        const char *kernel_filename, const char *kernel_cmdline,
+        const char *initrd_filename, const char *cpu_model)
+{
+    CPUState *env = NULL;
+    ram_addr_t ram_offset;
+    int n;
+
+    for (n = 0; n < smp_cpus; n++) {
+        env = cpu_init(cpu_model);
+        if (!env) {
+            fprintf(stderr, "Unable to find CPU definition\n");
+            exit(1);
+        }
+    }
+
+    ram_offset = qemu_ram_alloc(NULL, "xtensa.dram", 0x10000);
+    cpu_register_physical_memory(0x5ffd0000, 0x10000, ram_offset);
+
+    ram_offset = qemu_ram_alloc(NULL, "xtensa.iram", 0x20000);
+    cpu_register_physical_memory(0x5ffe0000, 0x20000, ram_offset);
+
+    ram_offset = qemu_ram_alloc(NULL, "xtensa.sram", ram_size);
+    cpu_register_physical_memory(0x60000000, ram_size, ram_offset);
+
+    if (kernel_filename) {
+        uint64_t elf_entry;
+        uint64_t elf_lowaddr;
+
+        int success = load_elf(kernel_filename, NULL, NULL, &elf_entry,
+                &elf_lowaddr, NULL, 0, ELF_MACHINE, 0);
+        if (success > 0) {
+            env->pc = elf_entry;
+        }
+    }
+}
+
+static void xtensa_sample_init(ram_addr_t ram_size,
+                     const char *boot_device,
+                     const char *kernel_filename, const char *kernel_cmdline,
+                     const char *initrd_filename, const char *cpu_model)
+{
+    if (!cpu_model) {
+        cpu_model = "sample-xtensa-core";
+    }
+    xtensa_init(ram_size, boot_device, kernel_filename, kernel_cmdline,
+                  initrd_filename, cpu_model);
+}
+
+static QEMUMachine xtensa_sample_machine = {
+    .name = "sample-xtensa-machine",
+    .desc = "Sample Xtensa machine (sample Xtensa core)",
+    .init = xtensa_sample_init,
+    .max_cpus = 4,
+};
+
+static void xtensa_sample_machine_init(void)
+{
+    qemu_register_machine(&xtensa_sample_machine);
+}
+
+machine_init(xtensa_sample_machine_init);
-- 
1.7.3.4