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>

1 files changed, 126 insertions, 0 deletions

diff --git a/arch/unicore32/kernel/fpu-ucf64.c b/arch/unicore32/kernel/fpu-ucf64.c
new file mode 100644
index 000000000000..282a60ac82ba
--- /dev/null
+++ b/arch/unicore32/kernel/fpu-ucf64.c
@@ -0,0 +1,126 @@
+/*
+ * linux/arch/unicore32/kernel/fpu-ucf64.c
+ *
+ * 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.
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+
+#include <asm/fpu-ucf64.h>
+
+/*
+ * A special flag to tell the normalisation code not to normalise.
+ */
+#define F64_NAN_FLAG    0x100
+
+/*
+ * A bit pattern used to indicate the initial (unset) value of the
+ * exception mask, in case nothing handles an instruction.  This
+ * doesn't include the NAN flag, which get masked out before
+ * we check for an error.
+ */
+#define F64_EXCEPTION_ERROR     ((u32)-1 & ~F64_NAN_FLAG)
+
+/*
+ * Since we aren't building with -mfpu=f64, we need to code
+ * these instructions using their MRC/MCR equivalents.
+ */
+#define f64reg(_f64_) #_f64_
+
+#define cff(_f64_) ({                   \
+        u32 __v;                        \
+        asm("cff %0, " f64reg(_f64_) "@ fmrx    %0, " #_f64_    \
+            : "=r" (__v) : : "cc");     \
+        __v;                            \
+        })
+
+#define ctf(_f64_, _var_)               \
+        asm("ctf %0, " f64reg(_f64_) "@ fmxr    " #_f64_ ", %0" \
+           : : "r" (_var_) : "cc")
+
+/*
+ * Raise a SIGFPE for the current process.
+ * sicode describes the signal being raised.
+ */
+void ucf64_raise_sigfpe(unsigned int sicode, struct pt_regs *regs)
+{
+        siginfo_t info;
+
+        memset(&info, 0, sizeof(info));
+
+        info.si_signo = SIGFPE;
+        info.si_code = sicode;
+        info.si_addr = (void __user *)(instruction_pointer(regs) - 4);
+
+        /*
+         * This is the same as NWFPE, because it's not clear what
+         * this is used for
+         */
+        current->thread.error_code = 0;
+        current->thread.trap_no = 6;
+
+        send_sig_info(SIGFPE, &info, current);
+}
+
+/*
+ * Handle exceptions of UniCore-F64.
+ */
+void ucf64_exchandler(u32 inst, u32 fpexc, struct pt_regs *regs)
+{
+        u32 tmp = fpexc;
+        u32 exc = F64_EXCEPTION_ERROR & fpexc;
+
+        pr_debug("UniCore-F64: instruction %08x fpscr %08x\n",
+                        inst, fpexc);
+
+        if (exc & FPSCR_CMPINSTR_BIT) {
+                if (exc & FPSCR_CON)
+                        tmp |= FPSCR_CON;
+                else
+                        tmp &= ~(FPSCR_CON);
+                exc &= ~(FPSCR_CMPINSTR_BIT | FPSCR_CON);
+        } else {
+                pr_debug(KERN_ERR "UniCore-F64 Error: unhandled exceptions\n");
+                pr_debug(KERN_ERR "UniCore-F64 FPSCR 0x%08x INST 0x%08x\n",
+                                cff(FPSCR), inst);
+
+                ucf64_raise_sigfpe(0, regs);
+                return;
+        }
+
+        /*
+         * Update the FPSCR with the additional exception flags.
+         * Comparison instructions always return at least one of
+         * these flags set.
+         */
+        tmp &= ~(FPSCR_TRAP | FPSCR_IOS | FPSCR_OFS | FPSCR_UFS |
+                        FPSCR_IXS | FPSCR_HIS | FPSCR_IOC | FPSCR_OFC |
+                        FPSCR_UFC | FPSCR_IXC | FPSCR_HIC);
+
+        tmp |= exc;
+        ctf(FPSCR, tmp);
+}
+
+/*
+ * F64 support code initialisation.
+ */
+static int __init ucf64_init(void)
+{
+        ctf(FPSCR, 0x0);     /* FPSCR_UFE | FPSCR_NDE perhaps better */
+
+        printk(KERN_INFO "Enable UniCore-F64 support.\n");
+
+        return 0;
+}
+
+late_initcall(ucf64_init);