#ifndef _SEMIHOSTING_H
#define _SEMIHOSTING_H
+/*
+ * These are the encoded instructions used to indicate a semihosting trap. They
+ * are named like SMH_ISA_INSN, where ISA is the instruction set (e.g.
+ * AArch64), and INSN is the mneumonic for the instruction.
+ */
+#define SMH_A64_HLT 0xD45E0000
+#define SMH_A32_SVC 0xEF123456
+#define SMH_A32_HLT 0xE10F0070
+#define SMH_T32_SVC 0xDFAB
+#define SMH_T32_HLT 0xBABC
+
+#if CONFIG_IS_ENABLED(SEMIHOSTING_FALLBACK)
+/**
+ * semihosting_enabled() - Determine whether semihosting is supported
+ *
+ * Semihosting-based drivers should call this function before making other
+ * semihosting calls.
+ *
+ * Return: %true if a debugger is attached which supports semihosting, %false
+ * otherwise
+ */
+bool semihosting_enabled(void);
+
+/**
+ * disable_semihosting() - Cause semihosting_enabled() to return false
+ *
+ * If U-Boot ever receives an unhandled exception caused by a semihosting trap,
+ * the trap handler should call this function.
+ */
+void disable_semihosting(void);
+#else
+static inline bool semihosting_enabled(void)
+{
+ return CONFIG_IS_ENABLED(SEMIHOSTING);
+}
+
+static inline void disable_semihosting(void)
+{
+}
+#endif
+
/**
* enum smh_open_mode - Numeric file modes for use with smh_open()
* MODE_READ: 'r'