X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=arch%2Fx86%2FKconfig;h=5f9597b230fe6b7b0abe7aec7a142ec7a7eff80f;hb=66c246cce7c66019a93ff7105157c3e2126dd277;hp=0884af22a79edf3b245fb1c1c8a39d9eb871f1eb;hpb=4b6dddc294a58fd9010926719e5c907beebf9b4d;p=u-boot

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0884af22a7..5f9597b230 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -4,6 +4,52 @@ menu "x86 architecture"
 config SYS_ARCH
 	default "x86"
 
+choice
+	prompt "Run U-Boot in 32/64-bit mode"
+	default X86_RUN_32BIT
+	help
+	  U-Boot can be built as a 32-bit binary which runs in 32-bit mode
+	  even on 64-bit machines. In this case SPL is not used, and U-Boot
+	  runs directly from the reset vector (via 16-bit start-up).
+
+	  Alternatively it can be run as a 64-bit binary, thus requiring a
+	  64-bit machine. In this case SPL runs in 32-bit mode (via 16-bit
+	  start-up) then jumps to U-Boot in 64-bit mode.
+
+	  For now, 32-bit mode is recommended, as 64-bit is still
+	  experimental and is missing a lot of features.
+
+config X86_RUN_32BIT
+	bool "32-bit"
+	help
+	  Build U-Boot as a 32-bit binary with no SPL. This is the currently
+	  supported normal setup. U-Boot will stay in 32-bit mode even on
+	  64-bit machines. When booting a 64-bit kernel, U-Boot will switch
+	  to 64-bit just before starting the kernel. Only the bottom 4GB of
+	  memory can be accessed through normal means, although
+	  arch_phys_memset() can be used for basic access to other memory.
+
+config X86_RUN_64BIT
+	bool "64-bit"
+	select X86_64
+	select SUPPORT_SPL
+	select SPL
+	select SPL_SEPARATE_BSS
+	help
+	  Build U-Boot as a 64-bit binary with a 32-bit SPL. This is
+	  experimental and many features are missing. U-Boot SPL starts up,
+	  runs through the 16-bit and 32-bit init, then switches to 64-bit
+	  mode and jumps to U-Boot proper.
+
+endchoice
+
+config X86_64
+	bool
+
+config SPL_X86_64
+	bool
+	depends on SPL
+
 choice
 	prompt "Mainboard vendor"
 	default VENDOR_EMULATION
@@ -89,6 +135,46 @@ config X86_RESET_VECTOR
 	bool
 	default n
 
+# The following options control where the 16-bit and 32-bit init lies
+# If SPL is enabled then it normally holds this init code, and U-Boot proper
+# is normally a 64-bit build.
+#
+# The 16-bit init refers to the reset vector and the small amount of code to
+# get the processor into 32-bit mode. It may be in SPL or in U-Boot proper,
+# or missing altogether if U-Boot is started from EFI or coreboot.
+#
+# The 32-bit init refers to processor init, running binary blobs including
+# FSP, setting up interrupts and anything else that needs to be done in
+# 32-bit code. It is normally in the same place as 16-bit init if that is
+# enabled (i.e. they are both in SPL, or both in U-Boot proper).
+config X86_16BIT_INIT
+	bool
+	depends on X86_RESET_VECTOR
+	default y if X86_RESET_VECTOR && !SPL
+	help
+	  This is enabled when 16-bit init is in U-Boot proper
+
+config SPL_X86_16BIT_INIT
+	bool
+	depends on X86_RESET_VECTOR
+	default y if X86_RESET_VECTOR && SPL
+	help
+	  This is enabled when 16-bit init is in SPL
+
+config X86_32BIT_INIT
+	bool
+	depends on X86_RESET_VECTOR
+	default y if X86_RESET_VECTOR && !SPL
+	help
+	  This is enabled when 32-bit init is in U-Boot proper
+
+config SPL_X86_32BIT_INIT
+	bool
+	depends on X86_RESET_VECTOR
+	default y if X86_RESET_VECTOR && SPL
+	help
+	  This is enabled when 32-bit init is in SPL
+
 config RESET_SEG_START
 	hex
 	depends on X86_RESET_VECTOR
@@ -109,6 +195,14 @@ config SYS_X86_START16
 	depends on X86_RESET_VECTOR
 	default 0xfffff800
 
+config X86_LOAD_FROM_32_BIT
+	bool "Boot from a 32-bit program"
+	help
+	  Define this to boot U-Boot from a 32-bit program which sets
+	  the GDT differently. This can be used to boot directly from
+	  any stage of coreboot, for example, bypassing the normal
+	  payload-loading feature.
+
 config BOARD_ROMSIZE_KB_512
 	bool
 config BOARD_ROMSIZE_KB_1024