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