Change in coreboot[master]: arch/x86/boot: Jump to payload in protected mode

[Patrick Rudolph (Code Review)]

Patrick Rudolph has uploaded a new patch set (#33) to the change originally created by Patrick Rudolph. ( https://review.coreboot.org/c/coreboot/+/30118 )

Change subject: arch/x86/boot: Jump to payload in protected mode
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arch/x86/boot: Jump to payload in protected mode

*   On ARCH_RAMSTAGE_X86_64 jump to the payload in protected mode.
*   Add a helper function to jump to arbitrary code in protected mode,
    similar to the real mode call handler.
*   Doesn't affect existing x86_32 code.
*   Add a macro to cast pointer to uint32_t that dies if it would overflow
    on conversion

Tested on QEMU Q35 using SeaBIOS as payload.
Tested on Lenovo T410 with additional x86_64 patches.

Change-Id: I6552ac30f1b6205e08e16d251328e01ce3fbfd14
Signed-off-by: Patrick Rudolph 
---
M Documentation/arch/x86/index.md
M src/arch/x86/Makefile.inc
M src/arch/x86/boot.c
A src/arch/x86/c_exit.S
M src/arch/x86/include/arch/boot/boot.h
M src/include/assert.h
6 files changed, 74 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/18/30118/33