Pthread-based emulator for unit testingstabilize-4100.38.B

This is the first version of pthread-based RTOS emulator. With this, we
will be able to test high-level modules entirely on the host machine.

BUG=chrome-os-partner:19325
TEST='make runtests' and see tests passing.
BRANCH=None

Change-Id: I1f5fcd76aa84bdb46c7d35c5e60ae5d92fd3a319
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/49954
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

34 files changed, 964 insertions, 22 deletions

diff --git a/Makefile.rules b/Makefile.rules
index e9b0a1802c..4def77851c 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -34,12 +34,14 @@ cmd_flat_to_obj = $(CC) -T $(out)/firmware_image.lds -nostdlib $(CPPFLAGS) \
 cmd_elf_to_flat = $(OBJCOPY) -O binary $^ $@
 cmd_elf_to_dis = $(OBJDUMP) -D $< > $@
 cmd_elf = $(LD) $(LDFLAGS) $(objs) -o $@ -T $< -Map $(out)/$*.map
+cmd_exe = $(CC) $(HOST_TEST_LDFLAGS) $(objs) -o $@
 cmd_c_to_o = $(CC) $(CFLAGS) -MMD -MF $@.d -c $< -o $@
 cmd_c_to_build = $(BUILDCC) $(BUILD_CFLAGS) $(BUILD_LDFLAGS) \
 	         -MMD -MF $@.d $< -o $@
 cmd_c_to_host = $(HOSTCC) $(HOST_CFLAGS) -MMD -MF $@.d $(filter %.c, $^) -o $@
 cmd_qemu = ./util/run_qemu_test --image=build/$(BOARD)/$*/$*.bin test/$*.py \
 	   $(silent)
+cmd_host_test = ./util/run_host_test $* $(silent)
 cmd_version = ./util/getversion.sh > $@
 cmd_mv_from_tmp = mv $(out)/$*.bin.tmp $(out)/$*.bin
 cmd_extractrw-y = cd $(out) && \
@@ -47,7 +49,7 @@ cmd_extractrw-y = cd $(out) && \
 	mv RW_SECTION_A $(PROJECT).RW.bin
 cmd_copyrw-y = cd $(out) && cp $(PROJECT).RW.flat $(PROJECT).RW.bin
 
-.PHONY: all tests utils
+.PHONY: all tests utils hosttests
 all: $(out)/$(PROJECT).bin utils
 
 dis-y = $(out)/$(PROJECT).RO.dis $(out)/$(PROJECT).RW.dis
@@ -55,9 +57,10 @@ dis: $(dis-y)
 
 utils: $(build-utils) $(host-utils)
 
+# On board test binaries
 test-targets=$(foreach t,$(test-list-y),test-$(t))
 qemu-test-targets=$(foreach t,$(test-list-y),qemu-$(t))
-.PHONY: $(qemu-test-target) $(test-targets)
+.PHONY: $(qemu-test-targets) $(test-targets)
 
 $(test-targets): test-%:
 	@set -e ; \
@@ -72,6 +75,24 @@ $(qemu-test-targets): qemu-%: test-%
 tests: $(test-targets)
 qemu-tests: $(qemu-test-targets)
 
+# Emulator test executables
+host-test-targets=$(foreach t,$(test-list-host),host-$(t))
+run-test-targets=$(foreach t,$(test-list-host),run-$(t))
+.PHONY: $(host-test-targets) $(run-test-targets)
+
+$(host-test-targets): host-%:
+	@set -e ; \
+	echo "  BUILD   host - build/host/$*" ; \
+	$(MAKE) --no-print-directory BOARD=host PROJECT=$* \
+	        V=$(V) out=build/host/$* TEST_BUILD=y EMU_BUILD=y \
+		CROSS_COMPILE= build/host/$*/$*.exe
+
+$(run-test-targets): run-%: host-%
+	$(call quiet,host_test,TEST   )
+
+hosttests: $(host-test-targets)
+runtests: $(run-test-targets)
+
 $(out)/firmware_image.lds: common/firmware_image.lds.S
 	$(call quiet,lds,LDS    )
 $(out)/%.lds: core/$(CORE)/ec.lds.S
@@ -98,6 +119,9 @@ $(out)/%.flat: $(out)/%.elf
 $(out)/%.elf: $(out)/%.lds $(objs)
 	$(call quiet,elf,LD     )
 
+$(out)/$(PROJECT).exe: $(objs)
+	$(call quiet,exe,EXE    )
+
 $(out)/%.o:%.c
 	$(call quiet,c_to_o,CC     )
 
diff --git a/Makefile.toolchain b/Makefile.toolchain
index 8b2de15a85..0ec8365d8f 100644
--- a/Makefile.toolchain
+++ b/Makefile.toolchain
@@ -27,7 +27,8 @@ CFLAGS_WARN=-Wall -Werror -Wundef -Wstrict-prototypes -Wno-trigraphs      \
 CFLAGS_DEBUG= -g
 CFLAGS_INCLUDE=$(foreach i,$(includes),-I$(i) )
 CFLAGS_TEST=$(if $(TEST_BUILD),-DTEST_BUILD \
-                               -DTEST_TASKFILE=$(PROJECT).tasklist,)
+                               -DTEST_TASKFILE=$(PROJECT).tasklist,) \
+            $(if $(EMU_BUILD),-DEMU_BUILD)
 CFLAGS_DEFINE=-DOUTDIR=$(out) -DCHIP=$(CHIP) -DBOARD_TASKFILE=ec.tasklist \
               -DBOARD=$(BOARD) -DBOARD_$(BOARD) -DCORE=$(CORE)            \
               -DCHIP_$(CHIP) -DCHIP_VARIANT=$(CHIP_VARIANT)               \
@@ -49,3 +50,6 @@ BUILD_CFLAGS= $(LIBFTDI_CFLAGS) $(CPPFLAGS) -O3 $(CFLAGS_DEBUG) $(CFLAGS_WARN)
 HOST_CFLAGS=$(CPPFLAGS) -O3 $(CFLAGS_DEBUG) $(CFLAGS_WARN)
 LDFLAGS=-nostdlib -X
 BUILD_LDFLAGS=$(LIBFTDI_LDLIBS)
+# For EC emulation on host environment, we need to force 32-bit binary.
+# TODO: Fix this. See crosbug.com/p/19257
+HOST_TEST_LDFLAGS=-T core/host/host_exe.lds -m32 -lrt -pthread
diff --git a/board/host/board.c b/board/host/board.c
new file mode 100644
index 0000000000..a3b8c28aca
--- /dev/null
+++ b/board/host/board.c
@@ -0,0 +1,12 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+/* Emulator board-specific configuration */
+
+#include "board.h"
+#include "gpio.h"
+
+const struct gpio_info gpio_list[GPIO_COUNT] = {
+	{"EC_INT", 0, 0, 0, 0},
+};
diff --git a/board/host/board.h b/board/host/board.h
new file mode 100644
index 0000000000..de7049bd9d
--- /dev/null
+++ b/board/host/board.h
@@ -0,0 +1,21 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Emulator board configuration */
+
+#ifndef __BOARD_H
+#define __BOARD_H
+
+#define CONFIG_HOST_EMU
+#define CONFIG_HOSTCMD
+#define CONFIG_KEYBOARD_PROTOCOL_MKBP
+
+enum gpio_signal {
+	GPIO_EC_INT,
+
+	GPIO_COUNT
+};
+
+#endif /* __BOARD_H */
diff --git a/board/host/build.mk b/board/host/build.mk
new file mode 100644
index 0000000000..28525a7679
--- /dev/null
+++ b/board/host/build.mk
@@ -0,0 +1,11 @@
+# -*- makefile -*-
+# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# Board specific files build
+#
+
+CHIP:=host
+
+board-y=board.o chipset.o
diff --git a/board/host/chipset.c b/board/host/chipset.c
new file mode 100644
index 0000000000..b06e293778
--- /dev/null
+++ b/board/host/chipset.c
@@ -0,0 +1,34 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Chipset module for emulator */
+
+#include <stdio.h>
+#include "chipset.h"
+#include "common.h"
+#include "task.h"
+
+test_mockable void chipset_reset(int cold_reset)
+{
+	fprintf(stderr, "Chipset reset!\n");
+}
+
+test_mockable void chipset_force_shutdown(void)
+{
+	/* Do nothing */
+}
+
+#ifdef HAS_TASK_CHIPSET
+test_mockable int chipset_in_state(int state_mask)
+{
+	return state_mask & CHIPSET_STATE_SOFT_OFF;
+}
+
+test_mockable void chipset_task(void)
+{
+	while (1)
+		task_wait_event(-1);
+}
+#endif
diff --git a/board/host/ec.tasklist b/board/host/ec.tasklist
new file mode 100644
index 0000000000..d0597f8544
--- /dev/null
+++ b/board/host/ec.tasklist
@@ -0,0 +1,23 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/**
+ * List of enabled tasks in the priority order
+ *
+ * The first one has the lowest priority.
+ *
+ * For each task, use the macro TASK_ALWAYS(n, r, d, s) for base tasks and
+ * TASK_NOTEST(n, r, d, s) for tasks that can be excluded in test binaries,
+ * where :
+ * 'n' in the name of the task
+ * 'r' in the main routine of the task
+ * 'd' in an opaque parameter passed to the routine at startup
+ * 's' is the stack size in bytes; must be a multiple of 8
+ */
+
+#define CONFIG_TASK_LIST \
+	TASK_ALWAYS(HOOKS, hook_task, NULL, TASK_STACK_SIZE) \
+	TASK_ALWAYS(CONSOLE, console_task, NULL, TASK_STACK_SIZE) \
+	TASK_ALWAYS(HOSTCMD, host_command_task, NULL, TASK_STACK_SIZE)
diff --git a/chip/host/build.mk b/chip/host/build.mk
new file mode 100644
index 0000000000..ddcbefdb0b
--- /dev/null
+++ b/chip/host/build.mk
@@ -0,0 +1,12 @@
+# -*- makefile -*-
+# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# emulator specific files build
+#
+
+CORE:=host
+
+chip-y=system.o gpio.o uart.o
+chip-$(HAS_TASK_KEYSCAN)+=keyboard_raw.o
diff --git a/chip/host/config.h b/chip/host/config.h
new file mode 100644
index 0000000000..7f2df4e467
--- /dev/null
+++ b/chip/host/config.h
@@ -0,0 +1,51 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Chip config header file */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+/* Memory mapping */
+#define CONFIG_FLASH_BASE       0x08000000
+#define CONFIG_FLASH_PHYSICAL_SIZE 0x00020000
+#define CONFIG_FLASH_SIZE       CONFIG_FLASH_PHYSICAL_SIZE
+#define CONFIG_FLASH_BANK_SIZE  0x1000
+#define CONFIG_FLASH_ERASE_SIZE 0x0400  /* erase bank size */
+#define CONFIG_FLASH_WRITE_SIZE 0x0002  /* minimum write size */
+#define CONFIG_RAM_BASE         0x20000000
+#define CONFIG_RAM_SIZE         0x00002000
+
+/* Size of one firmware image in flash */
+#define CONFIG_FW_IMAGE_SIZE    (64 * 1024)
+
+#define CONFIG_FW_RO_OFF        0
+#define CONFIG_FW_RO_SIZE       (CONFIG_FW_IMAGE_SIZE \
+				 - CONFIG_SECTION_FLASH_PSTATE_SIZE)
+#define CONFIG_FW_RW_OFF        CONFIG_FW_IMAGE_SIZE
+#define CONFIG_FW_RW_SIZE       CONFIG_FW_IMAGE_SIZE
+
+#define CONFIG_SECTION_RO_OFF   CONFIG_FW_RO_OFF
+#define CONFIG_SECTION_RO_SIZE  CONFIG_FW_RO_SIZE
+#define CONFIG_SECTION_RW_OFF   CONFIG_FW_RW_OFF
+#define CONFIG_SECTION_RW_SIZE  CONFIG_FW_RW_SIZE
+#define CONFIG_SECTION_WP_RO_OFF   CONFIG_FW_RO_OFF
+#define CONFIG_SECTION_WP_RO_SIZE  CONFIG_FW_IMAGE_SIZE
+
+/*
+ * Put this after RO to give RW more space. This also makes RO write protect
+ * region contiguous.
+ */
+#define CONFIG_SECTION_FLASH_PSTATE_SIZE  (1 * CONFIG_FLASH_BANK_SIZE)
+#define CONFIG_SECTION_FLASH_PSTATE_OFF   CONFIG_FW_RO_OFF + CONFIG_FW_RO_SIZE
+
+/* Maximum number of deferrable functions */
+#define DEFERRABLE_MAX_COUNT 8
+
+/* Interval between HOOK_TICK notifications */
+#define HOOK_TICK_INTERVAL (250 * MSEC)
+
+#endif /* __CONFIG_H */
+
diff --git a/chip/host/gpio.c b/chip/host/gpio.c
new file mode 100644
index 0000000000..03cfaa4aed
--- /dev/null
+++ b/chip/host/gpio.c
@@ -0,0 +1,24 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* GPIO module for emulator */
+
+#include "common.h"
+#include "gpio.h"
+
+test_mockable void gpio_pre_init(void)
+{
+	/* Nothing */
+}
+
+test_mockable int gpio_get_level(enum gpio_signal signal)
+{
+	return 0;
+}
+
+test_mockable void gpio_set_level(enum gpio_signal signal, int value)
+{
+	/* Nothing */
+}
diff --git a/chip/host/keyboard_raw.c b/chip/host/keyboard_raw.c
new file mode 100644
index 0000000000..561a72aafa
--- /dev/null
+++ b/chip/host/keyboard_raw.c
@@ -0,0 +1,46 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Raw keyboard I/O layer for emulator */
+
+#include "common.h"
+#include "keyboard_config.h"
+#include "keyboard_raw.h"
+#include "keyboard_scan.h"
+#include "task.h"
+#include "util.h"
+
+test_mockable void keyboard_raw_init(void)
+{
+	/* Nothing */
+}
+
+test_mockable void keyboard_raw_task_start(void)
+{
+	/* Nothing */
+}
+
+test_mockable void keyboard_raw_drive_column(int out)
+{
+	/* Nothing */
+}
+
+test_mockable int keyboard_raw_read_rows(void)
+{
+	/* Nothing pressed */
+	return 0;
+}
+
+test_mockable void keyboard_raw_enable_interrupt(int enable)
+{
+	/* Nothing */
+}
+
+test_mockable void keyboard_raw_gpio_interrupt(enum gpio_signal signal)
+{
+#ifdef HAS_TASK_KEYSCAN
+	task_wake(TASK_ID_KEYSCAN);
+#endif
+}
diff --git a/chip/host/system.c b/chip/host/system.c
new file mode 100644
index 0000000000..50da8db9c0
--- /dev/null
+++ b/chip/host/system.c
@@ -0,0 +1,74 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* System module for emulator */
+
+#include <stdlib.h>
+
+#include "host_test.h"
+#include "system.h"
+
+#define SHARED_MEM_SIZE 512 /* bytes */
+char __shared_mem_buf[SHARED_MEM_SIZE];
+
+test_mockable void system_reset(int flags)
+{
+	exit(EXIT_CODE_RESET | flags);
+}
+
+test_mockable void system_hibernate(uint32_t seconds, uint32_t microseconds)
+{
+	exit(EXIT_CODE_HIBERNATE);
+}
+
+test_mockable int system_is_locked(void)
+{
+	return 0;
+}
+
+test_mockable int system_jumped_to_this_image(void)
+{
+	return 0;
+}
+
+test_mockable uint32_t system_get_reset_flags(void)
+{
+	return RESET_FLAG_POWER_ON;
+}
+
+const char *system_get_chip_vendor(void)
+{
+	return "chromeos";
+}
+
+const char *system_get_chip_name(void)
+{
+	return "emu";
+}
+
+const char *system_get_chip_revision(void)
+{
+	return "";
+}
+
+int system_get_vbnvcontext(uint8_t *block)
+{
+	return EC_ERROR_UNIMPLEMENTED;
+}
+
+int system_set_vbnvcontext(const uint8_t *block)
+{
+	return EC_ERROR_UNIMPLEMENTED;
+}
+
+int system_usable_ram_end(void)
+{
+	return (int)(__shared_mem_buf + SHARED_MEM_SIZE);
+}
+
+void system_pre_init(void)
+{
+	/* Nothing */
+}
diff --git a/chip/host/uart.c b/chip/host/uart.c
new file mode 100644
index 0000000000..cbae79974b
--- /dev/null
+++ b/chip/host/uart.c
@@ -0,0 +1,86 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* UART driver for emulator */
+
+#include <stdio.h>
+
+#include "board.h"
+#include "config.h"
+#include "task.h"
+#include "uart.h"
+
+static int stopped;
+static int int_disabled;
+static int init_done;
+
+static void trigger_interrupt(void)
+{
+	if (!int_disabled)
+		uart_process();
+}
+
+int uart_init_done(void)
+{
+	return init_done;
+}
+
+void uart_tx_start(void)
+{
+	stopped = 0;
+	trigger_interrupt();
+}
+
+void uart_tx_stop(void)
+{
+	stopped = 1;
+}
+
+int uart_tx_stopped(void)
+{
+	return stopped;
+}
+
+void uart_tx_flush(void)
+{
+	/* Nothing */
+}
+
+int uart_tx_ready(void)
+{
+	return 1;
+}
+
+int uart_rx_available(void)
+{
+	return 0;
+}
+
+void uart_write_char(char c)
+{
+	printf("%c", c);
+	fflush(stdout);
+}
+
+int uart_read_char(void)
+{
+	/* Should never be called for now */
+	return 0;
+}
+
+void uart_disable_interrupt(void)
+{
+	int_disabled = 1;
+}
+
+void uart_enable_interrupt(void)
+{
+	int_disabled = 0;
+}
+
+void uart_init(void)
+{
+	init_done = 1;
+}
diff --git a/common/main.c b/common/main.c
index bd1b6f4543..9a5a75f1cd 100644
--- a/common/main.c
+++ b/common/main.c
@@ -27,7 +27,7 @@
 #define CPUTS(outstr) cputs(CC_SYSTEM, outstr)
 #define CPRINTF(format, args...) cprintf(CC_SYSTEM, format, ## args)
 
-int main(void)
+test_mockable int main(void)
 {
 	/*
 	 * Pre-initialization (pre-verified boot) stage.  Initialization at
diff --git a/common/system_common.c b/common/system_common.c
index dbb83303b1..239dd12a75 100644
--- a/common/system_common.c
+++ b/common/system_common.c
@@ -104,7 +104,7 @@ int system_is_locked(void)
 #endif
 }
 
-int system_usable_ram_end(void)
+test_mockable int system_usable_ram_end(void)
 {
 	/* Leave space at the end of RAM for jump data and tags.
 	 *
diff --git a/core/host/atomic.h b/core/host/atomic.h
new file mode 100644
index 0000000000..77e9cc6ba8
--- /dev/null
+++ b/core/host/atomic.h
@@ -0,0 +1,37 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Atomic operations for emulator */
+
+#ifndef __CROS_EC_ATOMIC_H
+#define __CROS_EC_ATOMIC_H
+
+#include "common.h"
+
+static inline void atomic_clear(uint32_t *addr, uint32_t bits)
+{
+	__sync_and_and_fetch(addr, ~bits);
+}
+
+static inline void atomic_or(uint32_t *addr, uint32_t bits)
+{
+	__sync_or_and_fetch(addr, bits);
+}
+
+static inline void atomic_add(uint32_t *addr, uint32_t value)
+{
+	__sync_add_and_fetch(addr, value);
+}
+
+static inline void atomic_sub(uint32_t *addr, uint32_t value)
+{
+	__sync_sub_and_fetch(addr, value);
+}
+
+static inline uint32_t atomic_read_clear(uint32_t *addr)
+{
+	return __sync_fetch_and_and(addr, 0);
+}
+#endif  /* __CROS_EC_ATOMIC_H */
diff --git a/core/host/build.mk b/core/host/build.mk
new file mode 100644
index 0000000000..879b9266fa
--- /dev/null
+++ b/core/host/build.mk
@@ -0,0 +1,11 @@
+# -*- makefile -*-
+# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# emulator specific files build
+#
+
+CFLAGS_CPU=-fno-builtin -m32
+
+core-y=main.o task.o timer.o panic.o disabled.o
diff --git a/core/host/cpu.h b/core/host/cpu.h
new file mode 100644
index 0000000000..4e43da623f
--- /dev/null
+++ b/core/host/cpu.h
@@ -0,0 +1,13 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* CPU specific header file */
+
+#ifndef __CPU_H
+#define __CPU_H
+
+static inline void cpu_init(void) { }
+
+#endif /* __CPU_H */
diff --git a/core/host/disabled.c b/core/host/disabled.c
new file mode 100644
index 0000000000..679a1ab451
--- /dev/null
+++ b/core/host/disabled.c
@@ -0,0 +1,11 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Disabled functions */
+
+#define DISABLED(proto) proto { }
+
+DISABLED(void jtag_pre_init(void));
+DISABLED(void clock_init(void));
diff --git a/core/host/host_exe.lds b/core/host/host_exe.lds
new file mode 100644
index 0000000000..46a5097d67
--- /dev/null
+++ b/core/host/host_exe.lds
@@ -0,0 +1,80 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+SECTIONS {
+  .rodata.ec_sections : {
+    /* Symbols defined here are declared in link_defs.h */
+    __irqprio = .;
+    *(.rodata.irqprio)
+    __irqprio_end = .;
+
+    . = ALIGN(4);
+    __cmds = .;
+    *(SORT(.rodata.cmds*))
+    __cmds_end = .;
+
+    . = ALIGN(4);
+    __hcmds = .;
+    *(.rodata.hcmds)
+    __hcmds_end = .;
+
+    . = ALIGN(4);
+    __hooks_init = .;
+    *(.rodata.HOOK_INIT)
+    __hooks_init_end = .;
+
+    __hooks_freq_change = .;
+    *(.rodata.HOOK_FREQ_CHANGE)
+    __hooks_freq_change_end = .;
+
+    __hooks_sysjump = .;
+    *(.rodata.HOOK_SYSJUMP)
+    __hooks_sysjump_end = .;
+
+    __hooks_chipset_pre_init = .;
+    *(.rodata.HOOK_CHIPSET_PRE_INIT)
+    __hooks_chipset_pre_init_end = .;
+
+    __hooks_chipset_startup = .;
+    *(.rodata.HOOK_CHIPSET_STARTUP)
+    __hooks_chipset_startup_end = .;
+
+    __hooks_chipset_resume = .;
+    *(.rodata.HOOK_CHIPSET_RESUME)
+    __hooks_chipset_resume_end = .;
+
+    __hooks_chipset_suspend = .;
+    *(.rodata.HOOK_CHIPSET_SUSPEND)
+    __hooks_chipset_suspend_end = .;
+
+    __hooks_chipset_shutdown = .;
+    *(.rodata.HOOK_CHIPSET_SHUTDOWN)
+    __hooks_chipset_shutdown_end = .;
+
+    __hooks_ac_change = .;
+    *(.rodata.HOOK_AC_CHANGE)
+    __hooks_ac_change_end = .;
+
+    __hooks_lid_change = .;
+    *(.rodata.HOOK_LID_CHANGE)
+    __hooks_lid_change_end = .;
+
+    __hooks_pwrbtn_change = .;
+    *(.rodata.HOOK_POWER_BUTTON_CHANGE)
+    __hooks_pwrbtn_change_end = .;
+
+    __hooks_tick = .;
+    *(.rodata.HOOK_TICK)
+    __hooks_tick_end = .;
+
+    __hooks_second = .;
+    *(.rodata.HOOK_SECOND)
+    __hooks_second_end = .;
+
+    __deferred_funcs = .;
+    *(.rodata.deferred)
+    __deferred_funcs_end = .;
+  }
+}
+INSERT BEFORE .rodata;
diff --git a/core/host/main.c b/core/host/main.c
new file mode 100644
index 0000000000..f370e4b561
--- /dev/null
+++ b/core/host/main.c
@@ -0,0 +1,18 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Entry point of unit test executable */
+
+#include "task.h"
+#include "timer.h"
+
+int main(void)
+{
+	timer_init();
+
+	task_start();
+
+	return 0;
+}
diff --git a/core/host/panic.c b/core/host/panic.c
new file mode 100644
index 0000000000..90ddf55dd7
--- /dev/null
+++ b/core/host/panic.c
@@ -0,0 +1,13 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "common.h"
+#include "panic.h"
+#include "util.h"
+
+struct panic_data *panic_get_data(void)
+{
+	return NULL;
+}
diff --git a/core/host/task.c b/core/host/task.c
new file mode 100644
index 0000000000..caad622778
--- /dev/null
+++ b/core/host/task.c
@@ -0,0 +1,208 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Task scheduling / events module for Chrome EC operating system */
+
+#include <pthread.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include "atomic.h"
+#include "common.h"
+#include "task.h"
+#include "task_id.h"
+#include "timer.h"
+
+struct emu_task_t {
+	pthread_t thread;
+	pthread_cond_t resume;
+	uint32_t event;
+	timestamp_t wake_time;
+};
+
+struct task_args {
+	void (*routine)(void *);
+	void *d;
+};
+
+static struct emu_task_t tasks[TASK_ID_COUNT];
+static pthread_cond_t scheduler_cond;
+static pthread_mutex_t run_lock;
+
+static __thread task_id_t my_task_id; /* thread local task id */
+
+#define TASK(n, r, d, s) void r(void *);
+CONFIG_TASK_LIST
+CONFIG_TEST_TASK_LIST
+#undef TASK
+
+/* Idle task */
+void __idle(void *d)
+{
+	while (1)
+		task_wait_event(-1);
+}
+
+/* Weak reference function as an entry point for unit test */
+test_mockable void run_test(void) { }
+
+void _run_test(void *d)
+{
+	run_test();
+}
+
+#define TASK(n, r, d, s) {r, d},
+struct task_args task_info[TASK_ID_COUNT] = {
+	{__idle, NULL},
+	CONFIG_TASK_LIST
+	CONFIG_TEST_TASK_LIST
+	{_run_test, NULL},
+};
+#undef TASK
+
+#define TASK(n, r, d, s) #n,
+static const char * const task_names[] = {
+	"<< idle >>",
+	CONFIG_TASK_LIST
+	CONFIG_TEST_TASK_LIST
+	"<< test runner >>",
+};
+#undef TASK
+
+void task_pre_init(void)
+{
+	/* Nothing */
+}
+
+int in_interrupt_context(void)
+{
+	return 0; /* No interrupt support yet */
+}
+
+void interrupt_disable(void)
+{
+	/* Not supported yet */
+}
+
+void interrupt_enable(void)
+{
+	/* Not supported yet */
+}
+
+uint32_t task_set_event(task_id_t tskid, uint32_t event, int wait)
+{
+	tasks[tskid].event = event;
+	if (wait)
+		return task_wait_event(-1);
+	return 0;
+}
+
+uint32_t task_wait_event(int timeout_us)
+{
+	int tid = task_get_current();
+	int ret;
+	if (timeout_us > 0)
+		tasks[tid].wake_time.val = get_time().val + timeout_us;
+	pthread_cond_signal(&scheduler_cond);
+	pthread_cond_wait(&tasks[tid].resume, &run_lock);
+	ret = tasks[tid].event;
+	tasks[tid].event = 0;
+	return ret;
+}
+
+void mutex_lock(struct mutex *mtx)
+{
+	int value = 0;
+	int id = 1 << task_get_current();
+
+	mtx->waiters |= id;
+
+	do {
+		if (mtx->lock == 0) {
+			mtx->lock = 1;
+			value = 1;
+		}
+
+		if (!value)
+			task_wait_event(-1);
+	} while (!value);
+
+	mtx->waiters &= ~id;
+}
+
+void mutex_unlock(struct mutex *mtx)
+{
+	int v;
+	mtx->lock = 0;
+
+	for (v = 31; v >= 0; --v)
+		if ((1ul << v) & mtx->waiters) {
+			mtx->waiters &= ~(1ul << v);
+			task_set_event(v, TASK_EVENT_MUTEX, 0);
+			break;
+		}
+}
+
+task_id_t task_get_current(void)
+{
+	return my_task_id;
+}
+
+void task_scheduler(void)
+{
+	int i;
+	timestamp_t now;
+
+	while (1) {
+		now = get_time();
+		i = TASK_ID_COUNT - 1;
+		while (i >= 0) {
+			if (tasks[i].event || now.val >= tasks[i].wake_time.val)
+				break;
+			--i;
+		}
+		if (i < 0)
+			i = TASK_ID_IDLE;
+
+		tasks[i].wake_time.val = ~0ull;
+		pthread_cond_signal(&tasks[i].resume);
+		pthread_cond_wait(&scheduler_cond, &run_lock);
+	}
+}
+
+void *_task_start_impl(void *a)
+{
+	long tid = (long)a;
+	struct task_args *arg = task_info + tid;
+	my_task_id = tid;
+	pthread_mutex_lock(&run_lock);
+	tasks[tid].event = 0;
+	(arg->routine)(arg->d);
+	while (1)
+		task_wait_event(-1);
+}
+
+int task_start(void)
+{
+	int i;
+
+	pthread_mutex_init(&run_lock, NULL);
+	pthread_cond_init(&scheduler_cond, NULL);
+
+	pthread_mutex_lock(&run_lock);
+
+	for (i = 0; i < TASK_ID_COUNT; ++i) {
+		tasks[i].event = TASK_EVENT_WAKE;
+		tasks[i].wake_time.val = ~0ull;
+		pthread_cond_init(&tasks[i].resume, NULL);
+		pthread_create(&tasks[i].thread, NULL, _task_start_impl,
+			       (void *)(size_t)i);
+		pthread_cond_wait(&scheduler_cond, &run_lock);
+	}
+
+	task_scheduler();
+
+	return 0;
+}
diff --git a/core/host/timer.c b/core/host/timer.c
new file mode 100644
index 0000000000..8de12a7f3c
--- /dev/null
+++ b/core/host/timer.c
@@ -0,0 +1,61 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Timer module */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <time.h>
+
+#include "task.h"
+#include "timer.h"
+
+static timestamp_t boot_time;
+
+void usleep(unsigned us)
+{
+	task_wait_event(us);
+}
+
+timestamp_t _get_time(void)
+{
+	struct timespec ts;
+	timestamp_t ret;
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	ret.val = 1000000 * (uint64_t)ts.tv_sec + ts.tv_nsec / 1000;
+	return ret;
+}
+
+timestamp_t get_time(void)
+{
+	timestamp_t ret = _get_time();
+	ret.val -= boot_time.val;
+	return ret;
+}
+
+void udelay(unsigned us)
+{
+	timestamp_t deadline = get_time();
+	deadline.val += us;
+	while (get_time().val < deadline.val)
+		;
+}
+
+int timestamp_expired(timestamp_t deadline, const timestamp_t *now)
+{
+	timestamp_t now_val;
+
+	if (!now) {
+		now_val = get_time();
+		now = &now_val;
+	}
+
+	return ((int64_t)(now->val - deadline.val) >= 0);
+}
+
+void timer_init(void)
+{
+	boot_time = _get_time();
+}
diff --git a/include/host_test.h b/include/host_test.h
new file mode 100644
index 0000000000..0c1b95d1fa
--- /dev/null
+++ b/include/host_test.h
@@ -0,0 +1,15 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Unit testing for Chrome EC */
+
+#ifndef __CROS_EC_HOST_TEST_H
+#define __CROS_EC_HOST_TEST_H
+
+/* Emulator exit codes */
+#define EXIT_CODE_RESET     (1 << 6) /* Leave six bits for SYSTEM_RESET_* */
+#define EXIT_CODE_HIBERNATE (1 << 7)
+
+#endif  /* __CROS_EC_HOST_TEST_H */
diff --git a/core/cortex-m/link_defs.h b/include/link_defs.h
index 6681d6b371..a8c54d4afe 100644
--- a/core/cortex-m/link_defs.h
+++ b/include/link_defs.h
@@ -1,4 +1,4 @@
-/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
diff --git a/include/task_id.h b/include/task_id.h
index 33445aee9c..985c39848c 100644
--- a/include/task_id.h
+++ b/include/task_id.h
@@ -47,6 +47,9 @@ enum {
 	CONFIG_TASK_LIST
 	/* CONFIG_TEST_TASK_LIST is a macro from the TEST_TASK_LIST file */
 	CONFIG_TEST_TASK_LIST
+#ifdef EMU_BUILD
+	TASK_ID_TEST_RUNNER,
+#endif
 	/* Number of tasks */
 	TASK_ID_COUNT,
 	/* Special task identifiers */
diff --git a/test/build.mk b/test/build.mk
index 7adf96f441..2c61e80e7d 100644
--- a/test/build.mk
+++ b/test/build.mk
@@ -24,6 +24,9 @@ test-list-$(BOARD_spring)+=kb_scan flash stress
 test-list-$(BOARD_link)=
 test-list-$(BOARD_slippy)=
 
+# Emulator tests
+test-list-host=mutex pingpong utils kb_scan
+
 flash-y=flash.o
 kb_mkbp-y=kb_mkbp.o
 kb_scan-y=kb_scan.o
diff --git a/test/kb_scan.c b/test/kb_scan.c
index 32822d689d..c242c43e09 100644
--- a/test/kb_scan.c
+++ b/test/kb_scan.c
@@ -257,7 +257,7 @@ int lid_test(void)
 }
 #endif
 
-static int command_run_test(int argc, char **argv)
+void run_test(void)
 {
 	error_count = 0;
 	lid_open = 1;
@@ -268,13 +268,16 @@ static int command_run_test(int argc, char **argv)
 	RUN_TEST(lid_test);
 #endif
 
-	if (error_count == 0) {
+	if (error_count == 0)
 		ccprintf("Pass!\n");
-		return EC_SUCCESS;
-	} else {
+	else
 		ccprintf("Fail!\n");
-		return EC_ERROR_UNKNOWN;
-	}
+}
+
+static int command_run_test(int argc, char **argv)
+{
+	run_test();
+	return EC_SUCCESS;
 }
 DECLARE_CONSOLE_COMMAND(runtest, command_run_test,
 			NULL, NULL, NULL);
diff --git a/test/mutex.c b/test/mutex.c
index 47f7fa97c4..bc20062d89 100644
--- a/test/mutex.c
+++ b/test/mutex.c
@@ -114,9 +114,14 @@ int mutex_main_task(void *unused)
 	return EC_SUCCESS;
 }
 
-static int command_run_test(int argc, char **argv)
+void run_test(void)
 {
 	task_wake(TASK_ID_MTX1);
+}
+
+static int command_run_test(int argc, char **argv)
+{
+	run_test();
 	return EC_SUCCESS;
 }
 DECLARE_CONSOLE_COMMAND(runtest, command_run_test,
diff --git a/test/pingpong.c b/test/pingpong.c
index f9266da26e..4cf5d53ced 100644
--- a/test/pingpong.c
+++ b/test/pingpong.c
@@ -58,10 +58,15 @@ int TaskTick(void *data)
 	return EC_SUCCESS;
 }
 
-static int command_run_test(int argc, char **argv)
+void run_test(void)
 {
 	task_wake(TASK_ID_TICK);
 	task_wake(TASK_ID_TESTA);
+}
+
+static int command_run_test(int argc, char **argv)
+{
+	run_test();
 	return EC_SUCCESS;
 }
 DECLARE_CONSOLE_COMMAND(runtest, command_run_test,
diff --git a/test/timer_dos.c b/test/timer_dos.c
index 5ac7cad5df..327206e6df 100644
--- a/test/timer_dos.c
+++ b/test/timer_dos.c
@@ -46,12 +46,17 @@ int TaskTimer(void *seed)
 	return EC_SUCCESS;
 }
 
-static int command_run_test(int argc, char **argv)
+void run_test(void)
 {
 	task_wake(TASK_ID_TMRD);
 	task_wake(TASK_ID_TMRC);
 	task_wake(TASK_ID_TMRB);
 	task_wake(TASK_ID_TMRA);
+}
+
+static int command_run_test(int argc, char **argv)
+{
+	run_test();
 	return EC_SUCCESS;
 }
 DECLARE_CONSOLE_COMMAND(runtest, command_run_test,
diff --git a/test/utils.c b/test/utils.c
index 1c04c0d06d..559e8a0d94 100644
--- a/test/utils.c
+++ b/test/utils.c
@@ -89,7 +89,7 @@ static int test_shared_mem(void)
 	for (i = 0; i < 256; ++i) {
 		memset(mem, i, sz);
 		for (j = 0; j < sz; ++j)
-			TEST_ASSERT(mem[j] == i);
+			TEST_ASSERT(mem[j] == (char)i);
 
 		if ((i & 0xf) == 0)
 			msleep(20); /* Yield to other tasks */
@@ -100,7 +100,7 @@ static int test_shared_mem(void)
 	return EC_SUCCESS;
 }
 
-static int command_run_test(int argc, char **argv)
+void run_test(void)
 {
 	error_count = 0;
 
@@ -111,13 +111,16 @@ static int command_run_test(int argc, char **argv)
 	RUN_TEST(test_uint64divmod);
 	RUN_TEST(test_shared_mem);
 
-	if (error_count) {
+	if (error_count)
 		ccprintf("Failed %d tests!\n", error_count);
-		return EC_ERROR_UNKNOWN;
-	} else {
+	else
 		ccprintf("Pass!\n");
-		return EC_SUCCESS;
-	}
+}
+
+static int command_run_test(int argc, char **argv)
+{
+	run_test();
+	return EC_SUCCESS;
 }
 DECLARE_CONSOLE_COMMAND(runtest, command_run_test,
 			NULL, NULL, NULL);
diff --git a/util/run_host_test b/util/run_host_test
new file mode 100755
index 0000000000..bf8d8efd97
--- /dev/null
+++ b/util/run_host_test
@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import pexpect
+import sys
+
+TIMEOUT=10
+
+test_name = sys.argv[1]
+child = pexpect.spawn('build/host/{0}/{0}.exe'.format(test_name),
+                      timeout=TIMEOUT)
+child.logfile = sys.stdout
+result_id = child.expect([pexpect.TIMEOUT, 'Pass!', 'Fail!'])
+if result_id == 0:
+  sys.stderr.write('Test %s timed out after %d seconds!\n' %
+                   (test_name, TIMEOUT))
+  sys.exit(1)
+elif result_id == 1:
+  sys.stderr.write('Test %s passed!\n' % test_name)
+  sys.exit(0)
+elif result_id == 2:
+  sys.stderr.write('Test %s failed!\n' % test_name)
+  sys.exit(1)