unicore32 additional architecture files: float point handling

This patch implements support for float point unit, which using UniCore-F64 FPU hardware
in UniCore32 ISA.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Acked-by: Arnd Bergmann <arnd@arndb.de>

2 files changed, 79 insertions, 0 deletions

diff --git a/arch/unicore32/include/asm/fpstate.h b/arch/unicore32/include/asm/fpstate.h
new file mode 100644
index 0000000..ba97fac
--- /dev/null
+++ b/arch/unicore32/include/asm/fpstate.h
@@ -0,0 +1,26 @@
+/*
+ * linux/arch/unicore32/include/asm/fpstate.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __UNICORE_FPSTATE_H__
+#define __UNICORE_FPSTATE_H__
+
+#ifndef __ASSEMBLY__
+
+#define FP_REGS_NUMBER		33
+
+struct fp_state {
+	unsigned int regs[FP_REGS_NUMBER];
+} __attribute__((aligned(8)));
+
+#endif
+
+#endif
diff --git a/arch/unicore32/include/asm/fpu-ucf64.h b/arch/unicore32/include/asm/fpu-ucf64.h
new file mode 100644
index 0000000..16c1457
--- /dev/null
+++ b/arch/unicore32/include/asm/fpu-ucf64.h
@@ -0,0 +1,53 @@
+/*
+ * linux/arch/unicore32/include/asm/fpu-ucf64.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ *	Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
+ *	Copyright (C) 2001-2010 Guan Xuetao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#define FPSCR			s31
+
+/* FPSCR bits */
+#define FPSCR_DEFAULT_NAN	(1<<25)
+
+#define FPSCR_CMPINSTR_BIT	(1<<31)
+
+#define FPSCR_CON		(1<<29)
+#define FPSCR_TRAP		(1<<27)
+
+/* RND mode */
+#define FPSCR_ROUND_NEAREST	(0<<0)
+#define FPSCR_ROUND_PLUSINF	(2<<0)
+#define FPSCR_ROUND_MINUSINF	(3<<0)
+#define FPSCR_ROUND_TOZERO	(1<<0)
+#define FPSCR_RMODE_BIT		(0)
+#define FPSCR_RMODE_MASK	(7 << FPSCR_RMODE_BIT)
+
+/* trap enable */
+#define FPSCR_IOE		(1<<16)
+#define FPSCR_OFE		(1<<14)
+#define FPSCR_UFE		(1<<13)
+#define FPSCR_IXE		(1<<12)
+#define FPSCR_HIE		(1<<11)
+#define FPSCR_NDE		(1<<10)	/* non denomal */
+
+/* flags */
+#define FPSCR_IDC		(1<<24)
+#define FPSCR_HIC		(1<<23)
+#define FPSCR_IXC		(1<<22)
+#define FPSCR_OFC		(1<<21)
+#define FPSCR_UFC		(1<<20)
+#define FPSCR_IOC		(1<<19)
+
+/* stick bits */
+#define FPSCR_IOS		(1<<9)
+#define FPSCR_OFS		(1<<7)
+#define FPSCR_UFS		(1<<6)
+#define FPSCR_IXS		(1<<5)
+#define FPSCR_HIS		(1<<4)
+#define FPSCR_NDS		(1<<3)	/*non denomal */