x86: qemu: Add a config for 64-bit U-Boot

Add a new board config which uses 64-bit U-Boot. Supported features
are the same as the other 64-bit board (Google Chromebook Link).
It is a start for us to test 64-bit U-Boot easily without the need
to access a real hardware.

Note CONFIG_SPL_ENV_SUPPORT is required for QEMU 64-bit as without
this the SPL build fails at the end. This is just a workaround as
CONFIG_SPL_ENV_SUPPORT is not needed at all.

common/built-in.o:(.data.env_htab+0xc): undefined reference to 'env_flags_validate'
lib/built-in.o: In function `hsearch_r':
lib/hashtable.c:380: undefined reference to 'env_callback_init'
lib/hashtable.c:382: undefined reference to 'env_flags_init'
make[1]: *** [spl/u-boot-spl] Error 1

Except those SPL options required by 64-bit, compared to 32-bit
config, the following options are different:

- CONFIG_SYS_MALLOC_F_LEN has to be increased to 0x1000 for SPL.
- CONFIG_DEBUG_UART has to be included due to the weird issue.
  See TODO comments in arch/x86/cpu/x86_64/cpu.c:arch_setup_gd().
  Once this issue gets fixed, debug uart can be optional.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

board/emulation/Kconfig

@@ -18,6 +18,13 @@ config TARGET_QEMU_X86
 	  supported by U-Boot. They are via QEMU '-M pc', an i440FX/PIIX
 	  chipset platform and '-M q35', a Q35/ICH9 chipset platform.
 
+config TARGET_QEMU_X86_64
+	bool "QEMU x86 64-bit"
+	help
+	  This is the QEMU emulated x86 64-bit board. With this config
+	  U-Boot is built as a 64-bit binary. This allows testing while
+	  this feature is being completed.
+
 endchoice
 
 source "board/emulation/qemu-x86/Kconfig"

board/emulation/qemu-x86/Kconfig

@@ -1,4 +1,4 @@
-if TARGET_QEMU_X86
+if TARGET_QEMU_X86 || TARGET_QEMU_X86_64
 
 config SYS_BOARD
 	default "qemu-x86"

board/emulation/qemu-x86/MAINTAINERS

@@ -6,3 +6,10 @@ F:	include/configs/qemu-x86.h
 F:	configs/qemu-x86_defconfig
 F:	configs/qemu-x86_efi_payload32_defconfig
 F:	configs/qemu-x86_efi_payload64_defconfig
+
+QEMU X86 64-bit BOARD
+M:	Bin Meng <bmeng.cn@gmail.com>
+S:	Maintained
+F:	board/emulation/qemu-x86/
+F:	include/configs/qemu-x86.h
+F:	configs/qemu-x86_64_defconfig

configs/qemu-x86_64_defconfig

@@ -0,0 +1,80 @@
+CONFIG_X86=y
+CONFIG_SPL_LIBCOMMON_SUPPORT=y
+CONFIG_SPL_LIBGENERIC_SUPPORT=y
+CONFIG_SYS_MALLOC_F_LEN=0x1000
+CONFIG_MAX_CPUS=2
+CONFIG_SPL_SERIAL_SUPPORT=y
+CONFIG_SPL_ENV_SUPPORT=y
+CONFIG_SPL_DRIVERS_MISC_SUPPORT=y
+CONFIG_SPL_SPI_FLASH_SUPPORT=y
+CONFIG_SPL_SPI_SUPPORT=y
+CONFIG_X86_RUN_64BIT=y
+CONFIG_DEFAULT_DEVICE_TREE="qemu-x86_i440fx"
+CONFIG_TARGET_QEMU_X86_64=y
+CONFIG_SMP=y
+CONFIG_GENERATE_PIRQ_TABLE=y
+CONFIG_GENERATE_MP_TABLE=y
+CONFIG_GENERATE_ACPI_TABLE=y
+CONFIG_FIT=y
+CONFIG_SPL_LOAD_FIT=y
+CONFIG_BOOTSTAGE=y
+CONFIG_BOOTSTAGE_REPORT=y
+CONFIG_SYS_CONSOLE_INFO_QUIET=y
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
+CONFIG_SPL_CPU_SUPPORT=y
+CONFIG_SPL_NET_SUPPORT=y
+CONFIG_SPL_PCI_SUPPORT=y
+CONFIG_SPL_PCH_SUPPORT=y
+CONFIG_SPL_RTC_SUPPORT=y
+CONFIG_SPL_TIMER_SUPPORT=y
+CONFIG_HUSH_PARSER=y
+CONFIG_CMD_CPU=y
+# CONFIG_CMD_BOOTEFI_HELLO_COMPILE is not set
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_FLASH is not set
+CONFIG_CMD_SF=y
+CONFIG_CMD_SPI=y
+CONFIG_CMD_USB=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_DHCP=y
+# CONFIG_CMD_NFS is not set
+CONFIG_CMD_PING=y
+CONFIG_CMD_TIME=y
+CONFIG_CMD_QFW=y
+CONFIG_CMD_BOOTSTAGE=y
+CONFIG_CMD_EXT2=y
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_EXT4_WRITE=y
+CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
+CONFIG_OF_CONTROL=y
+CONFIG_SPL_OF_CONTROL=y
+CONFIG_SPL_DM=y
+CONFIG_REGMAP=y
+CONFIG_SPL_REGMAP=y
+CONFIG_SYSCON=y
+CONFIG_SPL_SYSCON=y
+CONFIG_CPU=y
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_GIGADEVICE=y
+CONFIG_SPI_FLASH_MACRONIX=y
+CONFIG_SPI_FLASH_WINBOND=y
+CONFIG_DM_ETH=y
+CONFIG_E1000=y
+CONFIG_DM_PCI=y
+CONFIG_DM_RTC=y
+CONFIG_DEBUG_UART=y
+CONFIG_DEBUG_UART_BASE=0x3f8
+CONFIG_DEBUG_UART_CLOCK=1843200
+CONFIG_SYS_NS16550=y
+CONFIG_TIMER=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_STORAGE=y
+CONFIG_USB_KEYBOARD=y
+CONFIG_DM_VIDEO=y
+CONFIG_VIDEO_VESA=y
+CONFIG_FRAMEBUFFER_SET_VESA_MODE=y
+CONFIG_FRAMEBUFFER_VESA_MODE_111=y
+CONFIG_CONSOLE_SCROLL_LINES=5
+CONFIG_USE_PRIVATE_LIBGCC=y