summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/math-emu/mtfsf.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/math-emu/mtfsf.c')
-rw-r--r--arch/powerpc/math-emu/mtfsf.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/powerpc/math-emu/mtfsf.c b/arch/powerpc/math-emu/mtfsf.c
new file mode 100644
index 00000000000..d70cf714994
--- /dev/null
+++ b/arch/powerpc/math-emu/mtfsf.c
@@ -0,0 +1,45 @@
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+
+#include "soft-fp.h"
+
+int
+mtfsf(unsigned int FM, u32 *frB)
+{
+ u32 mask;
+
+ if (FM == 0)
+ return 0;
+
+ if (FM == 0xff)
+ mask = 0x9fffffff;
+ else {
+ mask = 0;
+ if (FM & (1 << 0))
+ mask |= 0x90000000;
+ if (FM & (1 << 1))
+ mask |= 0x0f000000;
+ if (FM & (1 << 2))
+ mask |= 0x00f00000;
+ if (FM & (1 << 3))
+ mask |= 0x000f0000;
+ if (FM & (1 << 4))
+ mask |= 0x0000f000;
+ if (FM & (1 << 5))
+ mask |= 0x00000f00;
+ if (FM & (1 << 6))
+ mask |= 0x000000f0;
+ if (FM & (1 << 7))
+ mask |= 0x0000000f;
+ }
+
+ __FPU_FPSCR &= ~(mask);
+ __FPU_FPSCR |= (frB[1] & mask);
+
+#ifdef DEBUG
+ printk("%s: %02x %p: %08lx\n", __FUNCTION__, FM, frB, __FPU_FPSCR);
+#endif
+
+ return 0;
+}