Start the emulator without graphics in command line environments

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Fix an error message when linking to initial root fs

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Introduce DDE for Linux 3.6

This patch is based on the related patches from dde36 branch of the master
repo. Refer to the branch for more information.

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Building support for DDE on amd64

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Align initcall sections by 8 bytes

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Prepare DDE during initialization

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Random debug stuffs

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Remove images once used in autotests

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Adjust test parameters

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Merge branch 'master' of https://github.com/eternalNight/ucore_plus-next

Conflicts:
	ucore/src/kern-ucore/Makefile
	ucore/src/kern-ucore/arch/amd64/Kconfig
	ucore/src/kern-ucore/arch/amd64/Makefile.image
	ucore/src/kern-ucore/arch/amd64/init/init.c
	ucore/src/kern-ucore/arch/amd64/mm/pmm.c
	ucore/uCore_run

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Do not print '\n' as '\r\n' in the serial console

'\r\n' may confuse grep from matching end of line ('$').

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
The first arg of lapic_send_ipi should be of struct cpu *

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>