Clean up stack checking code

Several small improvements of the stack checking code:
- move the CPU0 stack check right before jumping to the payload
  and out of hardwaremain (that file is too crowded anyways)
- fix prototype in lib.h
- print size of used stack
- use checkstack function both on CPU0 and CPU1-x
- print amount of stack used per core

Signed-off-by: Stefan Reinauer <reinauer@google.com>

Test: Boot coreboot on Link, see the following output:
     ...
     CPU1: stack: 00156000 - 00157000, lowest used address 00156c68,
           stack used: 920 bytes
     CPU2: stack: 00155000 - 00156000, lowest used address 00155c68,
           stack used: 920 bytes
     CPU3: stack: 00154000 - 00155000, lowest used address 00154c68,
           stack used: 920 bytes
     ...
     Jumping to boot code at 1110008
     CPU0: stack: 00157000 - 00158000, lowest used address 00157af8,
           stack used: 1288 bytes

Change-Id: I7b83eeee0186559a0a62daa12e3f7782990fd2df
Reviewed-on: http://review.coreboot.org/1787
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/boot/selfboot.c b/src/boot/selfboot.c
index fd5b382764..2556a14d6e 100644
--- a/src/boot/selfboot.c
+++ b/src/boot/selfboot.c
@@ -519,6 +519,11 @@ int selfboot(struct lb_memory *mem, struct cbfs_payload *payload)
 	timestamp_add_now(TS_SELFBOOT_JUMP);
 #endif
 
+	/* Before we go off to run the payload, see if
+	 * we stayed within our bounds.
+	 */
+	checkstack(_estack, 0);
+
 	/* Jump to kernel */
 	jmp_to_elf_entry((void*)entry, bounce_buffer, bounce_size);
 	return 1;