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#

# Copyright (c) 2006 Martin Decky

# Copyright (c) 2006 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 <stack.h>

#include <register.h>

.register       %g2, #scratch

.register       %g3, #scratch

.text

.global halt

.global memcpy

.global jump_to_kernel

halt:

	b halt

	nop

memcpy:

	mov	%o0, %o3		! save dst

	add	%o1, 7, %g1

	and	%g1, -8, %g1

	cmp	%o1, %g1

	be,pn	%xcc, 3f

	add	%o0, 7, %g1

	mov	0, %g3

0:

	brz,pn	%o2, 2f

	mov	0, %g2

1:

	ldub	[%g3 + %o1], %g1

	add	%g2, 1, %g2

	cmp	%o2, %g2

	stb	%g1, [%g3 + %o0]

	bne,pt	%xcc, 1b

	mov	%g2, %g3

2:

	jmp	%o7 + 8			! exit point

	mov	%o3, %o0

3:

	and	%g1, -8, %g1

	cmp	%o0, %g1

	bne,pt	%xcc, 0b

	mov	0, %g3

	srlx	%o2, 3, %g4

	brz,pn	%g4, 5f

	mov	0, %g5

4:

	sllx	%g3, 3, %g2

	add	%g5, 1, %g3

	ldx	[%o1 + %g2], %g1

	mov	%g3, %g5

	cmp	%g4, %g3

	bne,pt	%xcc, 4b

	stx	%g1, [%o0 + %g2]

5:

	and	%o2, 7, %o2

	brz,pn	%o2, 2b

	sllx	%g4, 3, %g1

	mov	0, %g2

	add	%g1, %o0, %o0

	add	%g1, %o1, %g4

	mov	0, %g3

6:

	ldub	[%g2 + %g4], %g1

	stb	%g1, [%g2 + %o0]

	add	%g3, 1, %g2

	cmp	%o2, %g2

	bne,pt	%xcc, 6b

	mov	%g2, %g3

	jmp	%o7 + 8			! exit point

	mov	%o3, %o0

jump_to_kernel:

	/*

	 * We have copied code and now we need to guarantee cache coherence.

	 * 1. Make sure that the code we have moved has drained to main memory.

	 * 2. Invalidate I-cache.

	 * 3. Flush instruction pipeline.

	 */

	/*

	 * US3 processors have a write-invalidate cache, so explicitly

	 * invalidating it is not required. Whether to invalidate I-cache

	 * or not is decided according to the value of the ver.impl bits

	 * in the Version register.

	 */

! the lowest/greatest value of ver.impl for US3

#define FIRST_US3_CPU 0x14

#define LAST_US3_CPU 0x19

	rdpr %ver, %g2			! autodetect CPU using the Version register

	sllx %g2, 16, %g2		! extract ver.impl bits

	srlx %g2, 48, %g2

	addcc %g2, -FIRST_US3_CPU, %g0	! flush if ver.impl < FISRT_US3_CPU

	bl 0f

	nop

	addcc %g2, -LAST_US3_CPU, %g0	! flush if ver.impl > LAST_US3_CPU

	bg 0f

	nop

	ba 1f

	nop

0:

	call icache_flush

	nop

1:

	membar #StoreStore

	/*

	 * Flush the instruction pipeline.

	 */

	flush	%i7

	mov %o0, %l1

	mov %o1, %o0

	mov %o2, %o1

	mov %o3, %o2

	jmp %l1				! jump to kernel

	nop

#define ICACHE_SIZE		8192

#define ICACHE_LINE_SIZE	32

#define ICACHE_SET_BIT		(1 << 13)

#define ASI_ICACHE_TAG		0x67

# Flush I-cache

icache_flush:

	set	((ICACHE_SIZE - ICACHE_LINE_SIZE) | ICACHE_SET_BIT), %g1

	stxa	%g0, [%g1] ASI_ICACHE_TAG

0:	membar	#Sync

	subcc	%g1, ICACHE_LINE_SIZE, %g1

	bnz,pt	%xcc, 0b

	stxa	%g0, [%g1] ASI_ICACHE_TAG

	membar	#Sync

	retl

	! SF Erratum #51

	nop

.global ofw

ofw:

	save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp

	set ofw_cif, %l0

	ldx [%l0], %l0

	rdpr  %pstate, %l1

	and  %l1, ~PSTATE_AM_BIT, %l2

	wrpr  %l2, 0, %pstate

	jmpl %l0, %o7

	mov %i0, %o0

	wrpr %l1, 0, %pstate

	ret

	restore %o0, 0, %o0