| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * arch/alpha/lib/fpreg.c |
| * |
| * (C) Copyright 1998 Linus Torvalds |
| */ |
| |
| #include <linux/compiler.h> |
| #include <linux/export.h> |
| #include <linux/preempt.h> |
| #include <asm/fpu.h> |
| #include <asm/thread_info.h> |
| #include <asm/fpu.h> |
| |
| #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67) |
| #define STT(reg,val) asm volatile ("ftoit $f"#reg",%0" : "=r"(val)); |
| #else |
| #define STT(reg,val) asm volatile ("stt $f"#reg",%0" : "=m"(val)); |
| #endif |
| |
| unsigned long |
| alpha_read_fp_reg (unsigned long reg) |
| { |
| unsigned long val; |
| |
| if (unlikely(reg >= 32)) |
| return 0; |
| preempt_disable(); |
| if (current_thread_info()->status & TS_SAVED_FP) |
| val = current_thread_info()->fp[reg]; |
| else switch (reg) { |
| case 0: STT( 0, val); break; |
| case 1: STT( 1, val); break; |
| case 2: STT( 2, val); break; |
| case 3: STT( 3, val); break; |
| case 4: STT( 4, val); break; |
| case 5: STT( 5, val); break; |
| case 6: STT( 6, val); break; |
| case 7: STT( 7, val); break; |
| case 8: STT( 8, val); break; |
| case 9: STT( 9, val); break; |
| case 10: STT(10, val); break; |
| case 11: STT(11, val); break; |
| case 12: STT(12, val); break; |
| case 13: STT(13, val); break; |
| case 14: STT(14, val); break; |
| case 15: STT(15, val); break; |
| case 16: STT(16, val); break; |
| case 17: STT(17, val); break; |
| case 18: STT(18, val); break; |
| case 19: STT(19, val); break; |
| case 20: STT(20, val); break; |
| case 21: STT(21, val); break; |
| case 22: STT(22, val); break; |
| case 23: STT(23, val); break; |
| case 24: STT(24, val); break; |
| case 25: STT(25, val); break; |
| case 26: STT(26, val); break; |
| case 27: STT(27, val); break; |
| case 28: STT(28, val); break; |
| case 29: STT(29, val); break; |
| case 30: STT(30, val); break; |
| case 31: STT(31, val); break; |
| } |
| preempt_enable(); |
| return val; |
| } |
| EXPORT_SYMBOL(alpha_read_fp_reg); |
| |
| #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67) |
| #define LDT(reg,val) asm volatile ("itoft %0,$f"#reg : : "r"(val)); |
| #else |
| #define LDT(reg,val) asm volatile ("ldt $f"#reg",%0" : : "m"(val)); |
| #endif |
| |
| void |
| alpha_write_fp_reg (unsigned long reg, unsigned long val) |
| { |
| if (unlikely(reg >= 32)) |
| return; |
| |
| preempt_disable(); |
| if (current_thread_info()->status & TS_SAVED_FP) { |
| current_thread_info()->status |= TS_RESTORE_FP; |
| current_thread_info()->fp[reg] = val; |
| } else switch (reg) { |
| case 0: LDT( 0, val); break; |
| case 1: LDT( 1, val); break; |
| case 2: LDT( 2, val); break; |
| case 3: LDT( 3, val); break; |
| case 4: LDT( 4, val); break; |
| case 5: LDT( 5, val); break; |
| case 6: LDT( 6, val); break; |
| case 7: LDT( 7, val); break; |
| case 8: LDT( 8, val); break; |
| case 9: LDT( 9, val); break; |
| case 10: LDT(10, val); break; |
| case 11: LDT(11, val); break; |
| case 12: LDT(12, val); break; |
| case 13: LDT(13, val); break; |
| case 14: LDT(14, val); break; |
| case 15: LDT(15, val); break; |
| case 16: LDT(16, val); break; |
| case 17: LDT(17, val); break; |
| case 18: LDT(18, val); break; |
| case 19: LDT(19, val); break; |
| case 20: LDT(20, val); break; |
| case 21: LDT(21, val); break; |
| case 22: LDT(22, val); break; |
| case 23: LDT(23, val); break; |
| case 24: LDT(24, val); break; |
| case 25: LDT(25, val); break; |
| case 26: LDT(26, val); break; |
| case 27: LDT(27, val); break; |
| case 28: LDT(28, val); break; |
| case 29: LDT(29, val); break; |
| case 30: LDT(30, val); break; |
| case 31: LDT(31, val); break; |
| } |
| preempt_enable(); |
| } |
| EXPORT_SYMBOL(alpha_write_fp_reg); |
| |
| #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67) |
| #define STS(reg,val) asm volatile ("ftois $f"#reg",%0" : "=r"(val)); |
| #else |
| #define STS(reg,val) asm volatile ("sts $f"#reg",%0" : "=m"(val)); |
| #endif |
| |
| unsigned long |
| alpha_read_fp_reg_s (unsigned long reg) |
| { |
| unsigned long val; |
| |
| if (unlikely(reg >= 32)) |
| return 0; |
| |
| preempt_disable(); |
| if (current_thread_info()->status & TS_SAVED_FP) { |
| LDT(0, current_thread_info()->fp[reg]); |
| STS(0, val); |
| } else switch (reg) { |
| case 0: STS( 0, val); break; |
| case 1: STS( 1, val); break; |
| case 2: STS( 2, val); break; |
| case 3: STS( 3, val); break; |
| case 4: STS( 4, val); break; |
| case 5: STS( 5, val); break; |
| case 6: STS( 6, val); break; |
| case 7: STS( 7, val); break; |
| case 8: STS( 8, val); break; |
| case 9: STS( 9, val); break; |
| case 10: STS(10, val); break; |
| case 11: STS(11, val); break; |
| case 12: STS(12, val); break; |
| case 13: STS(13, val); break; |
| case 14: STS(14, val); break; |
| case 15: STS(15, val); break; |
| case 16: STS(16, val); break; |
| case 17: STS(17, val); break; |
| case 18: STS(18, val); break; |
| case 19: STS(19, val); break; |
| case 20: STS(20, val); break; |
| case 21: STS(21, val); break; |
| case 22: STS(22, val); break; |
| case 23: STS(23, val); break; |
| case 24: STS(24, val); break; |
| case 25: STS(25, val); break; |
| case 26: STS(26, val); break; |
| case 27: STS(27, val); break; |
| case 28: STS(28, val); break; |
| case 29: STS(29, val); break; |
| case 30: STS(30, val); break; |
| case 31: STS(31, val); break; |
| } |
| preempt_enable(); |
| return val; |
| } |
| EXPORT_SYMBOL(alpha_read_fp_reg_s); |
| |
| #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67) |
| #define LDS(reg,val) asm volatile ("itofs %0,$f"#reg : : "r"(val)); |
| #else |
| #define LDS(reg,val) asm volatile ("lds $f"#reg",%0" : : "m"(val)); |
| #endif |
| |
| void |
| alpha_write_fp_reg_s (unsigned long reg, unsigned long val) |
| { |
| if (unlikely(reg >= 32)) |
| return; |
| |
| preempt_disable(); |
| if (current_thread_info()->status & TS_SAVED_FP) { |
| current_thread_info()->status |= TS_RESTORE_FP; |
| LDS(0, val); |
| STT(0, current_thread_info()->fp[reg]); |
| } else switch (reg) { |
| case 0: LDS( 0, val); break; |
| case 1: LDS( 1, val); break; |
| case 2: LDS( 2, val); break; |
| case 3: LDS( 3, val); break; |
| case 4: LDS( 4, val); break; |
| case 5: LDS( 5, val); break; |
| case 6: LDS( 6, val); break; |
| case 7: LDS( 7, val); break; |
| case 8: LDS( 8, val); break; |
| case 9: LDS( 9, val); break; |
| case 10: LDS(10, val); break; |
| case 11: LDS(11, val); break; |
| case 12: LDS(12, val); break; |
| case 13: LDS(13, val); break; |
| case 14: LDS(14, val); break; |
| case 15: LDS(15, val); break; |
| case 16: LDS(16, val); break; |
| case 17: LDS(17, val); break; |
| case 18: LDS(18, val); break; |
| case 19: LDS(19, val); break; |
| case 20: LDS(20, val); break; |
| case 21: LDS(21, val); break; |
| case 22: LDS(22, val); break; |
| case 23: LDS(23, val); break; |
| case 24: LDS(24, val); break; |
| case 25: LDS(25, val); break; |
| case 26: LDS(26, val); break; |
| case 27: LDS(27, val); break; |
| case 28: LDS(28, val); break; |
| case 29: LDS(29, val); break; |
| case 30: LDS(30, val); break; |
| case 31: LDS(31, val); break; |
| } |
| preempt_enable(); |
| } |
| EXPORT_SYMBOL(alpha_write_fp_reg_s); |