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authorPeter Maydell <peter.maydell@linaro.org>2017-02-16 09:37:36 +0000
committerPeter Maydell <peter.maydell@linaro.org>2017-02-20 14:22:39 +0000
commitf814a4909feea98cc830acbe05ad6a682e779d00 (patch)
tree57a0dc23984f8569092b002ce6bd7e3b019cd552
parent85654cae392aa725435b1c2dc796377af7cf9e5e (diff)
downloadqemu-arm-f814a4909feea98cc830acbe05ad6a682e779d00.tar.gz
armv7m: Abstract out the "load kernel" code
Abstract the "load kernel" code out of armv7m_init() into its own function. This includes the registration of the CPU reset function, to parallel how we handle this for A profile cores. We make the function public so that boards which choose to directly instantiate an ARMv7M device object can call it. Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r--hw/arm/armv7m.c23
-rw-r--r--include/hw/arm/arm.h12
2 files changed, 30 insertions, 5 deletions
diff --git a/hw/arm/armv7m.c b/hw/arm/armv7m.c
index 0c9ca7bfa0..b2cc6e9ea2 100644
--- a/hw/arm/armv7m.c
+++ b/hw/arm/armv7m.c
@@ -176,10 +176,6 @@ DeviceState *armv7m_init(MemoryRegion *system_memory, int mem_size, int num_irq,
ARMCPU *cpu;
CPUARMState *env;
DeviceState *nvic;
- int image_size;
- uint64_t entry;
- uint64_t lowaddr;
- int big_endian;
if (cpu_model == NULL) {
cpu_model = "cortex-m3";
@@ -199,6 +195,16 @@ DeviceState *armv7m_init(MemoryRegion *system_memory, int mem_size, int num_irq,
qdev_init_nofail(nvic);
sysbus_connect_irq(SYS_BUS_DEVICE(nvic), 0,
qdev_get_gpio_in(DEVICE(cpu), ARM_CPU_IRQ));
+ armv7m_load_kernel(cpu, kernel_filename, mem_size);
+ return nvic;
+}
+
+void armv7m_load_kernel(ARMCPU *cpu, const char *kernel_filename, int mem_size)
+{
+ int image_size;
+ uint64_t entry;
+ uint64_t lowaddr;
+ int big_endian;
#ifdef TARGET_WORDS_BIGENDIAN
big_endian = 1;
@@ -224,8 +230,15 @@ DeviceState *armv7m_init(MemoryRegion *system_memory, int mem_size, int num_irq,
}
}
+ /* CPU objects (unlike devices) are not automatically reset on system
+ * reset, so we must always register a handler to do so. Unlike
+ * A-profile CPUs, we don't need to do anything special in the
+ * handler to arrange that it starts correctly.
+ * This is arguably the wrong place to do this, but it matches the
+ * way A-profile does it. Note that this means that every M profile
+ * board must call this function!
+ */
qemu_register_reset(armv7m_reset, cpu);
- return nvic;
}
static Property bitband_properties[] = {
diff --git a/include/hw/arm/arm.h b/include/hw/arm/arm.h
index c175c0e999..a3f79d3379 100644
--- a/include/hw/arm/arm.h
+++ b/include/hw/arm/arm.h
@@ -26,6 +26,18 @@ typedef enum {
/* armv7m.c */
DeviceState *armv7m_init(MemoryRegion *system_memory, int mem_size, int num_irq,
const char *kernel_filename, const char *cpu_model);
+/**
+ * armv7m_load_kernel:
+ * @cpu: CPU
+ * @kernel_filename: file to load
+ * @mem_size: mem_size: maximum image size to load
+ *
+ * Load the guest image for an ARMv7M system. This must be called by
+ * any ARMv7M board, either directly or via armv7m_init(). (This is
+ * necessary to ensure that the CPU resets correctly on system reset,
+ * as well as for kernel loading.)
+ */
+void armv7m_load_kernel(ARMCPU *cpu, const char *kernel_filename, int mem_size);
/*
* struct used as a parameter of the arm_load_kernel machine init