libpayload: Add x86_64 (64-bit) support

This patch introduces x86_64 (64-bit) support to the payload, building
upon the existing x86 (32-bit) architecture. Files necessary for 64-bit
compilation are now guarded by the `CONFIG_LP_ARCH_X86_64` Kconfig
option.

BUG=b:242829490
TEST=Able to verify all valid combinations between coreboot and
payload with this patch.

Payload Entry Point Behavior with below code.

+----------------+--------------------+----------------------------+
| LP_ARCH_X86_64 | Payload Entry Mode | Description                |
+----------------+--------------------+----------------------------+
| No             | 32-bit             | Direct protected mode init |
+----------------+--------------------+----------------------------+
| Yes            | 32-bit             | Protected to long mode     |
+----------------+--------------------+----------------------------+
| Yes            | 64-bit             | Long mode initialization   |
+----------------+--------------------+----------------------------+

Change-Id: I69fda47bedf1a14807b1515c4aed6e3a1d5b8585
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81968
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 1 insertions, 53 deletions

diff --git a/payloads/libpayload/libc/Makefile.mk b/payloads/libpayload/libc/Makefile.mk
index 2840476619..c9fc17a7b5 100644
--- a/payloads/libpayload/libc/Makefile.mk
+++ b/payloads/libpayload/libc/Makefile.mk
@@ -29,7 +29,7 @@
 
 libc-$(CONFIG_LP_LIBC) += malloc.c printf.c console.c string.c
 libc-$(CONFIG_LP_LIBC) += memory.c ctype.c lib.c libgcc.c
-libc-$(CONFIG_LP_LIBC) += rand.c time.c exec.c
+libc-$(CONFIG_LP_LIBC) += rand.c time.c
 libc-$(CONFIG_LP_LIBC) += readline.c getopt_long.c sysinfo.c
 libc-$(CONFIG_LP_LIBC) += args.c
 libc-$(CONFIG_LP_LIBC) += strlcpy.c
diff --git a/payloads/libpayload/libc/exec.c b/payloads/libpayload/libc/exec.c
deleted file mode 100644
index ae75a3e510..0000000000
--- a/payloads/libpayload/libc/exec.c
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- *
- * Copyright (C) 2008 Advanced Micro Devices, Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- *    derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <libpayload-config.h>
-#include <libpayload.h>
-
-#if CONFIG(LP_ARCH_X86)
-extern void i386_do_exec(long addr, int argc, char **argv, int *ret);
-#endif
-
-/**
- * Execute code in memory.
- *
- * @param addr TODO
- * @param argc TODO
- * @param argv TODO
- * @return Return the return value from the entry point.
- */
-int exec(long addr, int argc, char **argv)
-{
-	int val = -1;
-
-#if CONFIG(LP_ARCH_X86)
-	i386_do_exec(addr, argc, argv, &val);
-#endif
-	return val;
-}