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 000000000000..ba97fac6220d
--- /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 000000000000..16c1457882ee
--- /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 */