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-rw-r--r--02-usart/include/arch/arm/arch.h3
-rw-r--r--02-usart/include/arch/x86_64/arch.h6
2 files changed, 9 insertions, 0 deletions
diff --git a/02-usart/include/arch/arm/arch.h b/02-usart/include/arch/arm/arch.h
index 569ca77..f140c97 100644
--- a/02-usart/include/arch/arm/arch.h
+++ b/02-usart/include/arch/arm/arch.h
@@ -33,4 +33,7 @@
_Static_assert(sizeof(void*) == sizeof(uint32_t), "Pointers must be 32 bits");
#endif
+extern uint32_t DATA_SEGMENT_START;
+extern uint32_t DATA_SEGMENT_STOP;
+
#endif /* ARCH_H_ */
diff --git a/02-usart/include/arch/x86_64/arch.h b/02-usart/include/arch/x86_64/arch.h
index 258214e..accc449 100644
--- a/02-usart/include/arch/x86_64/arch.h
+++ b/02-usart/include/arch/x86_64/arch.h
@@ -24,4 +24,10 @@
#define SYSTEM_CONFIG_BLOCK_BASE (load_fake_scb__())
#define NVIC_BASE (load_fake_nvic__())
+// Pretend there's a data segement at the start of SRAM1 for more accurate
+// testing.
+#define GHOST_DATA_SEGMENT_SIZE 1234
+#define DATA_SEGMENT_START SRAM1_BASE
+#define DATA_SEGMENT_STOP (SRAM1_BASE + GHOST_DATA_SEGMENT_SIZE)
+
#endif /* ARCH_H_ */