[platform][armemu] add support for a fake armemu cpu

For the moment fix it as a armv7-a cpu with no mmu and no thumb.

arch/arm/include/arch/defines.h

@@ -34,6 +34,8 @@
 #define CACHE_LINE 32
 #elif ARM_CPU_ARM1136
 #define CACHE_LINE 32
+#elif ARM_CPU_ARMEMU
+#define CACHE_LINE 32
 #elif ARM_CPU_CORTEX_A7
 #define CACHE_LINE 64 /* XXX L1 icache is 32 bytes */
 #elif ARM_CPU_CORTEX_A8

arch/arm/rules.mk

@@ -151,6 +151,16 @@ GLOBAL_DEFINES += \
 	ARM_CPU_ARM1136=1
 HANDLED_CORE := true
 endif
+ifeq ($(ARM_CPU),armemu)
+# flavor of emulated cpu by the armemu project
+GLOBAL_DEFINES += \
+	ARM_WITH_CP15=1 \
+	ARM_ISA_ARMv7=1 \
+	ARM_ISA_ARMv7A=1 \
+	ARM_WITH_CACHE=1
+HANDLED_CORE := true
+ENABLE_THUMB := false # armemu doesn't currently support thumb properly
+endif
 
 ifneq ($(HANDLED_CORE),true)
 $(error $(LOCAL_DIR)/rules.mk doesnt have logic for arm core $(ARM_CPU))

arch/arm/toolchain.mk

@@ -90,5 +90,8 @@ endif
 ifeq ($(ARM_CPU),arm1176jzf-s)
 ARCH_arm_COMPILEFLAGS += -mcpu=$(ARM_CPU)
 endif
+ifeq ($(ARM_CPU),armemu)
+ARCH_arm_COMPILEFLAGS += -march=armv7-a
+endif
 
 endif

platform/armemu/interrupts.c

@@ -52,12 +52,8 @@ status_t mask_interrupt(unsigned int vector)
 
 //	dprintf("%s: vector %d\n", __PRETTY_FUNCTION__, vector);
 
-	enter_critical_section();
-
 	*REG32(PIC_MASK_LATCH) = 1 << vector;
 
-	exit_critical_section();
-
 	return NO_ERROR;
 }
 
@@ -68,12 +64,8 @@ status_t unmask_interrupt(unsigned int vector)
 
 //	dprintf("%s: vector %d\n", __PRETTY_FUNCTION__, vector);
 
-	enter_critical_section();
-
 	*REG32(PIC_UNMASK_LATCH) = 1 << vector;
 
-	exit_critical_section();
-
 	return NO_ERROR;
 }
 
@@ -113,11 +105,7 @@ void register_int_handler(unsigned int vector, int_handler handler, void *arg)
 	if (vector >= PIC_MAX_INT)
 		panic("register_int_handler: vector out of range %d\n", vector);
 
-	enter_critical_section();
-
 	int_handler_table[vector].handler = handler;
 	int_handler_table[vector].arg = arg;
-
-	exit_critical_section();
 }
 

platform/armemu/rules.mk

@@ -3,11 +3,10 @@ LOCAL_DIR := $(GET_LOCAL_DIR)
 MODULE := $(LOCAL_DIR)
 
 ARCH := arm
-ARM_CPU := arm1136j-s
+ARM_CPU := armemu
 CPU := generic
 
-# emulater doesn't support thumb properly
-ENABLE_THUMB := false
+WITH_KERNEL_VM := 0
 
 GLOBAL_INCLUDES += \
 	$(LOCAL_DIR)/include

platform/armemu/timer.c

@@ -33,8 +33,6 @@ static platform_timer_callback t_callback;
 
 status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg, lk_time_t interval)
 {
-	enter_critical_section();
-
 	t_callback = callback;
 
 	*REG(PIT_CLEAR) = 1;
@@ -43,8 +41,6 @@ status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg
 
 	unmask_interrupt(INT_PIT);
 
-	exit_critical_section();
-
 	return NO_ERROR;
 }
 

project/armemu-test.mk

@@ -13,10 +13,7 @@ MODULES += \
 	lib/gfxconsole \
 	lib/text \
 	lib/tga \
-	lib/evlog \
-	lib/debugcommands \
-	app/tests \
-	app/shell
+	lib/evlog
 
 GLOBAL_DEFINES += \
 	WITH_KERNEL_EVLOG=1
@@ -28,3 +25,5 @@ GLOBAL_DEFINES += \
 
 #EXTRA_BUILDDEPS += $(BUILDDIR)/armemu.conf
 #GENERATED += $(BUILDDIR)/armemu.conf
+
+include project/virtual/test.mk