summaryrefslogtreecommitdiff
path: root/arch/powerpc/math-emu/mcrfs.c
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/powerpc/math-emu/mcrfs.c
Initial import
Diffstat (limited to 'arch/powerpc/math-emu/mcrfs.c')
-rw-r--r--arch/powerpc/math-emu/mcrfs.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/powerpc/math-emu/mcrfs.c b/arch/powerpc/math-emu/mcrfs.c
new file mode 100644
index 000000000..e948d5708
--- /dev/null
+++ b/arch/powerpc/math-emu/mcrfs.c
@@ -0,0 +1,32 @@
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+
+int
+mcrfs(u32 *ccr, u32 crfD, u32 crfS)
+{
+ u32 value, clear;
+
+#ifdef DEBUG
+ printk("%s: %p (%08x) %d %d\n", __func__, ccr, *ccr, crfD, crfS);
+#endif
+
+ clear = 15 << ((7 - crfS) << 2);
+ if (!crfS)
+ clear = 0x90000000;
+
+ value = (__FPU_FPSCR >> ((7 - crfS) << 2)) & 15;
+ __FPU_FPSCR &= ~(clear);
+
+ *ccr &= ~(15 << ((7 - crfD) << 2));
+ *ccr |= (value << ((7 - crfD) << 2));
+
+#ifdef DEBUG
+ printk("CR: %08x\n", __func__, *ccr);
+#endif
+
+ return 0;
+}