52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <asm/uaccess.h>
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#include <asm/sfp-machine.h>
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#include <math-emu/soft-fp.h>
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int
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mtfsf(unsigned int FM, u32 *frB)
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{
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u32 mask;
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u32 fpscr;
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if (likely(FM == 1))
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mask = 0x0f;
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else if (likely(FM == 0xff))
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mask = ~0;
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else {
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mask = ((FM & 1) |
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((FM << 3) & 0x10) |
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((FM << 6) & 0x100) |
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((FM << 9) & 0x1000) |
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((FM << 12) & 0x10000) |
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((FM << 15) & 0x100000) |
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((FM << 18) & 0x1000000) |
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((FM << 21) & 0x10000000)) * 15;
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}
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fpscr = ((__FPU_FPSCR & ~mask) | (frB[1] & mask)) &
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~(FPSCR_VX | FPSCR_FEX | 0x800);
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if (fpscr & (FPSCR_VXSNAN | FPSCR_VXISI | FPSCR_VXIDI |
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FPSCR_VXZDZ | FPSCR_VXIMZ | FPSCR_VXVC |
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FPSCR_VXSOFT | FPSCR_VXSQRT | FPSCR_VXCVI))
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fpscr |= FPSCR_VX;
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/* The bit order of exception enables and exception status
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* is the same. Simply shift and mask to check for enabled
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* exceptions.
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*/
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if (fpscr & (fpscr >> 22) & 0xf8)
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fpscr |= FPSCR_FEX;
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__FPU_FPSCR = fpscr;
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#ifdef DEBUG
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printk("%s: %02x %p: %08lx\n", __func__, FM, frB, __FPU_FPSCR);
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#endif
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return 0;
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}
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