x86/platform/intel-mid: Enable 64-bit build

Intel Tangier SoC is known to have 64-bit dual core CPU. Enable
64-bit build for it.

The kernel has been tested on Intel Edison board:

	Linux buildroot 4.4.0-next-20160115+ #25 SMP Fri Jan 15 22:03:19 EET 2016 x86_64 GNU/Linux

	processor       : 0
	vendor_id       : GenuineIntel
	cpu family      : 6
	model           : 74
	model name      : Genuine Intel(R) CPU   4000  @  500MHz
	stepping        : 8

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1452888668-147116-1-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 258965d..07459a6 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -495,11 +495,10 @@ config X86_INTEL_CE
 
 config X86_INTEL_MID
        bool "Intel MID platform support"
-       depends on X86_32
        depends on X86_EXTENDED_PLATFORM
        depends on X86_PLATFORM_DEVICES
        depends on PCI
-       depends on PCI_GOANY
+       depends on X86_64 || (PCI_GOANY && X86_32)
        depends on X86_IO_APIC
        select SFI
        select I2C

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index f129a9a..2c0f340 100644 (file)
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -192,5 +192,13 @@ void __init x86_64_start_reservations(char *real_mode_data)
 
        reserve_ebda_region();
 
+       switch (boot_params.hdr.hardware_subarch) {
+       case X86_SUBARCH_INTEL_MID:
+               x86_intel_mid_early_setup();
+               break;
+       default:
+               break;
+       }
+
        start_kernel();
 }