1 files changed, 76 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/fpu.h b/arch/alpha/include/asm/fpu.h
new file mode 100644
index 000000000..b9691405e
--- /dev/null
+++ b/arch/alpha/include/asm/fpu.h
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_ALPHA_FPU_H
+#define __ASM_ALPHA_FPU_H
+
+#include <asm/special_insns.h>
+#include <uapi/asm/fpu.h>
+
+/* The following two functions don't need trapb/excb instructions
+   around the mf_fpcr/mt_fpcr instructions because (a) the kernel
+   never generates arithmetic faults and (b) call_pal instructions
+   are implied trap barriers.  */
+
+static inline unsigned long
+rdfpcr(void)
+{
+	unsigned long tmp, ret;
+
+#if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67)
+	__asm__ __volatile__ (
+		"ftoit $f0,%0\n\t"
+		"mf_fpcr $f0\n\t"
+		"ftoit $f0,%1\n\t"
+		"itoft %0,$f0"
+		: "=r"(tmp), "=r"(ret));
+#else
+	__asm__ __volatile__ (
+		"stt $f0,%0\n\t"
+		"mf_fpcr $f0\n\t"
+		"stt $f0,%1\n\t"
+		"ldt $f0,%0"
+		: "=m"(tmp), "=m"(ret));
+#endif
+
+	return ret;
+}
+
+static inline void
+wrfpcr(unsigned long val)
+{
+	unsigned long tmp;
+
+#if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67)
+	__asm__ __volatile__ (
+		"ftoit $f0,%0\n\t"
+		"itoft %1,$f0\n\t"
+		"mt_fpcr $f0\n\t"
+		"itoft %0,$f0"
+		: "=&r"(tmp) : "r"(val));
+#else
+	__asm__ __volatile__ (
+		"stt $f0,%0\n\t"
+		"ldt $f0,%1\n\t"
+		"mt_fpcr $f0\n\t"
+		"ldt $f0,%0"
+		: "=m"(tmp) : "m"(val));
+#endif
+}
+
+static inline unsigned long
+swcr_update_status(unsigned long swcr, unsigned long fpcr)
+{
+	/* EV6 implements most of the bits in hardware.  Collect
+	   the acrued exception bits from the real fpcr.  */
+	if (implver() == IMPLVER_EV6) {
+		swcr &= ~IEEE_STATUS_MASK;
+		swcr |= (fpcr >> 35) & IEEE_STATUS_MASK;
+	}
+	return swcr;
+}
+
+extern unsigned long alpha_read_fp_reg (unsigned long reg);
+extern void alpha_write_fp_reg (unsigned long reg, unsigned long val);
+extern unsigned long alpha_read_fp_reg_s (unsigned long reg);
+extern void alpha_write_fp_reg_s (unsigned long reg, unsigned long val);
+
+#endif /* __ASM_ALPHA_FPU_H */