[coreboot-gerrit] Change in coreboot[master]: src/arch/x86/car.ld: add AP entry address in CAR space

[Michał Żygowski (Code Review)]

Michał Żygowski has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/37167 )

Change subject: src/arch/x86/car.ld: add AP entry address in CAR space
......................................................................

src/arch/x86/car.ld: add AP entry address in CAR space

This is a placeholder for AP entry address for AMD platforms
that support C environment bootblock. This shortcut address
allows APs to jump to the AGESA entries directly after CAR setup
and avoid looking for a scratch register for each family to store
the AP entry address.

Signed-off-by: Michał Żygowski 
Change-Id: I177cd6f84c3f36776ec7bc8eeacb5b2a1d9142d2
---
M src/arch/x86/car.ld
M src/arch/x86/include/arch/symbols.h
2 files changed, 7 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/67/37167/1

diff --git a/src/arch/x86/car.ld b/src/arch/x86/car.ld
index 3680250..de760f8 100644
--- a/src/arch/x86/car.ld
+++ b/src/arch/x86/car.ld
@@ -68,6 +68,11 @@
         . += 80;
         _ecar_ehci_dbg_info = .;

+	. = ALIGN(ARCH_POINTER_ALIGN_SIZE);
+	_car_amd_ap_entry = .;
+	. += 4;
+	_ecar_amd_ap_entry = .;
+
    /* _bss and _ebss provide symbols to per-stage
     * variables that are not shared like the timestamp and the pre-ram
     * cbmem console. This is useful for clearing this area on a per-stage
diff --git a/src/arch/x86/include/arch/symbols.h b/src/arch/x86/include/arch/symbols.h
index efe10fe..9ab0dba 100644
--- a/src/arch/x86/include/arch/symbols.h
+++ b/src/arch/x86/include/arch/symbols.h
@@ -38,4 +38,6 @@
 #define _car_ehci_dbg_info_size \
    (_ecar_ehci_dbg_info - _car_ehci_dbg_info)

+extern unsigned long _car_amd_ap_entry;
+
 #endif