Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / powerpc / math-emu / fmadd.c

diff --git a/kernel/arch/powerpc/math-emu/fmadd.c b/kernel/arch/powerpc/math-emu/fmadd.c
new file mode 100644 (file)
index 0000000..8c3f20a
--- /dev/null
+++ b/kernel/arch/powerpc/math-emu/fmadd.c
@@ -0,0 +1,51 @@
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+
+int
+fmadd(void *frD, void *frA, void *frB, void *frC)
+{
+       FP_DECL_D(R);
+       FP_DECL_D(A);
+       FP_DECL_D(B);
+       FP_DECL_D(C);
+       FP_DECL_D(T);
+       FP_DECL_EX;
+
+#ifdef DEBUG
+       printk("%s: %p %p %p %p\n", __func__, frD, frA, frB, frC);
+#endif
+
+       FP_UNPACK_DP(A, frA);
+       FP_UNPACK_DP(B, frB);
+       FP_UNPACK_DP(C, frC);
+
+#ifdef DEBUG
+       printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
+       printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
+       printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
+#endif
+
+       if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
+           (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
+                FP_SET_EXCEPTION(EFLAG_VXIMZ);
+
+       FP_MUL_D(T, A, C);
+
+       if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
+               FP_SET_EXCEPTION(EFLAG_VXISI);
+
+       FP_ADD_D(R, T, B);
+
+#ifdef DEBUG
+       printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
+#endif
+
+       __FP_PACK_D(frD, R);
+
+       return FP_CUR_EXCEPTIONS;
+}