GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2005 - 2013 Tensilica Inc.
+ * Copyright (C) 2014 - 2016 Cadence Design Systems Inc.
+ */
+
+#ifndef _XTENSA_ASMMACRO_H
+#define _XTENSA_ASMMACRO_H
+
+#include <asm/arch/core.h>
+
+/*
+ * Function entry and return macros for supported ABIs.
+ */
+
+#if defined(__XTENSA_WINDOWED_ABI__)
+#define abi_entry	entry	sp, 16
+#define abi_ret		retw
+#elif defined(__XTENSA_CALL0_ABI__)
+#define abi_entry
+#define abi_ret		ret
+#else
+#error Unsupported Xtensa ABI
+#endif
+
+/*
+ * Some little helpers for loops. Use zero-overhead-loops
+ * where applicable and if supported by the processor.
+ *
+ * __loopi ar, at, size, inc
+ *         ar	register initialized with the start address
+ *	   at	scratch register used by macro
+ *	   size	size immediate value
+ *	   inc	increment
+ *
+ * __loops ar, as, at, inc_log2[, mask_log2][, cond][, ncond]
+ *	   ar	register initialized with the start address
+ *	   as	register initialized with the size
+ *	   at	scratch register use by macro
+ *	   inc_log2	increment [in log2]
+ *	   mask_log2	mask [in log2]
+ *	   cond		true condition (used in loop'cond')
+ *	   ncond	false condition (used in b'ncond')
+ *
+ * __loop  as
+ *	   restart loop. 'as' register must not have been modified!
+ *
+ * __endla ar, as, incr
+ *	   ar	start address (modified)
+ *	   as	scratch register used by __loops/__loopi macros or
+ *		end address used by __loopt macro
+ *	   inc	increment
+ */
+
+#if XCHAL_HAVE_LOOPS
+
+.macro	__loopi ar, at, size, incr
+	movi	\at, ((\size + \incr - 1) / (\incr))
+	loop	\at, 99f
+.endm
+
+
+.macro	__loops	ar, as, at, incr_log2, mask_log2, cond, ncond
+	.ifgt \incr_log2 - 1
+		addi	\at, \as, (1 << \incr_log2) - 1
+		.ifnc \mask_log2,
+			extui	\at, \at, \incr_log2, \mask_log2
+		.else
+			srli	\at, \at, \incr_log2
+		.endif
+	.endif
+	loop\cond	\at, 99f
+.endm
+
+
+.macro	__loopt	ar, as, at, incr_log2
+	sub	\at, \as, \ar
+	.ifgt	\incr_log2 - 1
+		addi	\at, \at, (1 << \incr_log2) - 1
+		srli	\at, \at, \incr_log2
+	.endif
+	loop	\at, 99f
+.endm
+
+
+.macro	__loop	as
+	loop	\as, 99f
+.endm
+
+
+.macro	__endl	ar, as
+99:
+.endm
+
+
+#else
+
+.macro	__loopi ar, at, size, incr
+	movi	\at, ((\size + \incr - 1) / (\incr))
+	addi	\at, \ar, \size
+98:
+.endm
+
+
+.macro	__loops	ar, as, at, incr_log2, mask_log2, cond, ncond
+	.ifnc \mask_log2,
+		extui	\at, \as, \incr_log2, \mask_log2
+	.else
+		.ifnc \ncond,
+			srli	\at, \as, \incr_log2
+		.endif
+	.endif
+	.ifnc \ncond,
+		b\ncond	\at, 99f
+
+	.endif
+	.ifnc \mask_log2,
+		slli	\at, \at, \incr_log2
+		add	\at, \ar, \at
+	.else
+		add	\at, \ar, \as
+	.endif
+98:
+.endm
+
+.macro	__loopt	ar, as, at, incr_log2
+98:
+.endm
+
+
+.macro	__loop	as
+98:
+.endm
+
+
+.macro	__endl	ar, as
+	bltu	\ar, \as, 98b
+99:
+.endm
+
+
+#endif
+
+
+.macro	__endla	ar, as, incr
+	addi	\ar, \ar, \incr
+	__endl	\ar \as
+.endm
+
+
+#endif /* _XTENSA_ASMMACRO_H */