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#

# Copyright (c) 2003-2004 Jakub Jermar

# All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

#

# - Redistributions of source code must retain the above copyright

#   notice, this list of conditions and the following disclaimer.

# - Redistributions in binary form must reproduce the above copyright

#   notice, this list of conditions and the following disclaimer in the

#   documentation and/or other materials provided with the distribution.

# - The name of the author may not be used to endorse or promote products

#   derived from this software without specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#

#include <arch/asm/regname.h>

.text

.macro cp0_read reg

	mfc0 $2, \reg

	j $31

	nop

.endm

.macro cp0_write reg

	mtc0 $4, \reg

	j $31

	nop

.endm

.set noat

.set noreorder

.set nomacro

.global asm_delay_loop

asm_delay_loop:

	j $31

	nop

.global cpu_halt

cpu_halt:

	j cpu_halt

	nop

.global memsetb

memsetb:

	j _memsetb

	nop

.global memsetw

memsetw:

	j _memsetw

	nop

.global memcpy

.global memcpy_from_uspace

.global memcpy_to_uspace

.global memcpy_from_uspace_failover_address

.global memcpy_to_uspace_failover_address

memcpy:

memcpy_from_uspace:

memcpy_to_uspace:

	move $t2, $a0      # save dst

	addiu $v0, $a1, 3

	li $v1, -4         # 0xfffffffffffffffc

	and $v0, $v0, $v1

	beq $a1, $v0, 3f

	move $t0, $a0

	0:

		beq $a2, $zero, 2f

		move $a3, $zero

	1:

		addu $v0, $a1, $a3

		lbu $a0, 0($v0)

		addu $v1, $t0, $a3

		addiu $a3, $a3, 1

		bne $a3, $a2, 1b

		sb $a0, 0($v1)

	2:

		jr $ra

		move $v0, $t2

	3:

		addiu $v0, $a0, 3

		and $v0, $v0, $v1

		bne $a0, $v0, 0b

		srl $t1, $a2, 2

		beq $t1, $zero, 5f

		move $a3, $zero

		move $a3, $zero

		move $a0, $zero

	4:

		addu $v0, $a1, $a0

		lw $v1, 0($v0)

		addiu $a3, $a3, 1

		addu $v0, $t0, $a0

		sw $v1, 0($v0)

		bne $a3, $t1, 4b

		addiu $a0, $a0, 4

	5:

		andi $a2, $a2, 0x3

		beq $a2, $zero, 2b

		nop

		sll $v0, $a3, 2

		addu $t1, $v0, $t0

		move $a3, $zero

		addu $t0, $v0, $a1

	6:

		addu $v0, $t0, $a3

		lbu $a0, 0($v0)

		addu $v1, $t1, $a3

		addiu $a3, $a3, 1

		bne $a3, $a2, 6b

		sb $a0, 0($v1)

		jr $ra

		move $v0, $t2

memcpy_from_uspace_failover_address:

memcpy_to_uspace_failover_address:

	jr $ra

	move $v0, $zero

.macro fpu_gp_save reg ctx

	mfc1 $t0, $\reg

	sw $t0, \reg * 4(\ctx)

.endm

.macro fpu_gp_restore reg ctx

	lw $t0, \reg * 4(\ctx)

	mtc1 $t0, $\reg

.endm

.macro fpu_ct_save reg ctx

	cfc1 $t0, $1

	sw $t0, (\reg + 32) * 4(\ctx)

.endm	

.macro fpu_ct_restore reg ctx

	lw $t0, (\reg + 32) * 4(\ctx)

	ctc1 $t0, $\reg

.endm

.global fpu_context_save

fpu_context_save:

#ifdef CONFIG_FPU

	fpu_gp_save 0, $a0

	fpu_gp_save 1, $a0

	fpu_gp_save 2, $a0

	fpu_gp_save 3, $a0

	fpu_gp_save 4, $a0

	fpu_gp_save 5, $a0

	fpu_gp_save 6, $a0

	fpu_gp_save 7, $a0

	fpu_gp_save 8, $a0

	fpu_gp_save 9, $a0

	fpu_gp_save 10, $a0

	fpu_gp_save 11, $a0

	fpu_gp_save 12, $a0

	fpu_gp_save 13, $a0

	fpu_gp_save 14, $a0

	fpu_gp_save 15, $a0

	fpu_gp_save 16, $a0

	fpu_gp_save 17, $a0

	fpu_gp_save 18, $a0

	fpu_gp_save 19, $a0

	fpu_gp_save 20, $a0

	fpu_gp_save 21, $a0

	fpu_gp_save 22, $a0

	fpu_gp_save 23, $a0

	fpu_gp_save 24, $a0

	fpu_gp_save 25, $a0

	fpu_gp_save 26, $a0

	fpu_gp_save 27, $a0

	fpu_gp_save 28, $a0

	fpu_gp_save 29, $a0

	fpu_gp_save 30, $a0

	fpu_gp_save 31, $a0

	fpu_ct_save 1, $a0

	fpu_ct_save 2, $a0

	fpu_ct_save 3, $a0

	fpu_ct_save 4, $a0

	fpu_ct_save 5, $a0

	fpu_ct_save 6, $a0

	fpu_ct_save 7, $a0

	fpu_ct_save 8, $a0

	fpu_ct_save 9, $a0

	fpu_ct_save 10, $a0

	fpu_ct_save 11, $a0

	fpu_ct_save 12, $a0

	fpu_ct_save 13, $a0

	fpu_ct_save 14, $a0

	fpu_ct_save 15, $a0

	fpu_ct_save 16, $a0

	fpu_ct_save 17, $a0

	fpu_ct_save 18, $a0

	fpu_ct_save 19, $a0

	fpu_ct_save 20, $a0

	fpu_ct_save 21, $a0

	fpu_ct_save 22, $a0

	fpu_ct_save 23, $a0

	fpu_ct_save 24, $a0

	fpu_ct_save 25, $a0

	fpu_ct_save 26, $a0

	fpu_ct_save 27, $a0

	fpu_ct_save 28, $a0

	fpu_ct_save 29, $a0

	fpu_ct_save 30, $a0

	fpu_ct_save 31, $a0

#endif

	j $ra

	nop

.global fpu_context_restore

fpu_context_restore:

#ifdef CONFIG_FPU

	fpu_gp_restore 0, $a0

	fpu_gp_restore 1, $a0

	fpu_gp_restore 2, $a0

	fpu_gp_restore 3, $a0

	fpu_gp_restore 4, $a0

	fpu_gp_restore 5, $a0

	fpu_gp_restore 6, $a0

	fpu_gp_restore 7, $a0

	fpu_gp_restore 8, $a0

	fpu_gp_restore 9, $a0

	fpu_gp_restore 10, $a0

	fpu_gp_restore 11, $a0

	fpu_gp_restore 12, $a0

	fpu_gp_restore 13, $a0

	fpu_gp_restore 14, $a0

	fpu_gp_restore 15, $a0

	fpu_gp_restore 16, $a0

	fpu_gp_restore 17, $a0

	fpu_gp_restore 18, $a0

	fpu_gp_restore 19, $a0

	fpu_gp_restore 20, $a0

	fpu_gp_restore 21, $a0

	fpu_gp_restore 22, $a0

	fpu_gp_restore 23, $a0

	fpu_gp_restore 24, $a0

	fpu_gp_restore 25, $a0

	fpu_gp_restore 26, $a0

	fpu_gp_restore 27, $a0

	fpu_gp_restore 28, $a0

	fpu_gp_restore 29, $a0

	fpu_gp_restore 30, $a0

	fpu_gp_restore 31, $a0

	fpu_ct_restore 1, $a0

	fpu_ct_restore 2, $a0

	fpu_ct_restore 3, $a0

	fpu_ct_restore 4, $a0

	fpu_ct_restore 5, $a0

	fpu_ct_restore 6, $a0

	fpu_ct_restore 7, $a0

	fpu_ct_restore 8, $a0

	fpu_ct_restore 9, $a0

	fpu_ct_restore 10, $a0

	fpu_ct_restore 11, $a0

	fpu_ct_restore 12, $a0

	fpu_ct_restore 13, $a0

	fpu_ct_restore 14, $a0

	fpu_ct_restore 15, $a0

	fpu_ct_restore 16, $a0

	fpu_ct_restore 17, $a0

	fpu_ct_restore 18, $a0

	fpu_ct_restore 19, $a0

	fpu_ct_restore 20, $a0

	fpu_ct_restore 21, $a0

	fpu_ct_restore 22, $a0

	fpu_ct_restore 23, $a0

	fpu_ct_restore 24, $a0

	fpu_ct_restore 25, $a0

	fpu_ct_restore 26, $a0

	fpu_ct_restore 27, $a0

	fpu_ct_restore 28, $a0

	fpu_ct_restore 29, $a0

	fpu_ct_restore 30, $a0

	fpu_ct_restore 31, $a0

#endif

	j $ra

	nop