// 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);