include/rules.h: Add ENV_USER_SPACE definition

This lets code that run in userspace notify coreboot of that fact so
things that can't run in userspace can be excluded.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: I4da414bc96cfcf0464125eddc6b3f3a7b4506fcf
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43784
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/rules.h

@@ -267,6 +267,13 @@
 /* Currently rmodules, ramstage and smm have heap. */
 #define ENV_STAGE_HAS_HEAP_SECTION	(ENV_RMODULE || ENV_RAMSTAGE || ENV_SMM)
 
+/* Set USER_SPACE in the makefile for the rare code that runs in userspace */
+#if defined(__USER_SPACE__)
+#define ENV_USER_SPACE		1
+#else
+#define ENV_USER_SPACE		0
+#endif
+
 /**
  * For pre-DRAM stages and post-CAR always build with simple device model, ie.
  * PCI, PNP and CPU functions operate without use of devicetree. The reason