[coreboot-gerrit] Change in ...coreboot[master]: drivers/intel/fsp1.1: Read stack guards later

[Arthur Heymans (Code Review)]

Arthur Heymans has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/30875

Change subject: drivers/intel/fsp1.1: Read stack guards later
......................................................................

drivers/intel/fsp1.1: Read stack guards later

Read back the stack guards after most of the romstage took place.

Change-Id: Ia7dc26c7ed1750d4ebbe7514ed87da57f9e34a89
Signed-off-by: Arthur Heymans 
---
M src/drivers/intel/fsp1_1/car.c
1 file changed, 5 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/75/30875/1

diff --git a/src/drivers/intel/fsp1_1/car.c b/src/drivers/intel/fsp1_1/car.c
index 63c5042..79dd368 100644
--- a/src/drivers/intel/fsp1_1/car.c
+++ b/src/drivers/intel/fsp1_1/car.c
@@ -39,6 +39,7 @@
    const int num_guards = 4;
    const u32 stack_guard = 0xdeadbeef;
    u32 *stack_base;
+	void *ram_stack;
    u32 size;

/* Size of unallocated CAR. */
@@ -78,6 +79,9 @@

set_fih_car(car_params->fih);

+	/* Return new stack value in RAM back to assembly stub. */
+	ram_stack = cache_as_ram_stage_main(car_params->fih);
+
    /* Check the stack. */
    for (i = 0; i < num_guards; i++) {
    	if (stack_base[i] == stack_guard)
@@ -85,8 +89,7 @@
    	printk(BIOS_DEBUG, "Smashed stack detected in romstage!\n");
    }

-	/* Return new stack value in RAM back to assembly stub. */
-	return cache_as_ram_stage_main(car_params->fih);
+	return ram_stack;
 }

/* Entry point taken when romstage is called after a separate verstage. */