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#

# Copyright (c) 2005 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:

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# - Redistributions of source code must retain the above copyright

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#   derived from this software without specific prior written permission.

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

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#

#include <arch/register.h>

.text

/** Copy memory from/to userspace.

 *

 * This memcpy() has been taken from the assembler output of

 * the generic _memcpy() and modified to have the failover part.

 *

 * @param in0 Destination address.

 * @param in1 Source address.

 * @param in2 Number of byte to copy.

 */

.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:

	alloc loc0 = ar.pfs, 3, 1, 0, 0

	adds r14 = 7, in1

	mov r2 = ar.lc

	mov r8 = in1 ;;

	and r14 = -8, r14 ;;

	cmp.ne p6, p7 = r14, in1

(p7)	br.cond.dpnt 3f	;;

0:

	cmp.ne p6, p7 = 0, in2

(p7)	br.cond.dpnt 2f	;;

(p6)	adds r14 = -1, in2

(p6)	mov r16 = r0

(p6)	mov r17 = r0 ;;

(p6)	mov ar.lc = r14

1:

	add r14 = r16, r8

	add r15 = r16, in0

	adds r17 = 1, r17 ;;

	ld1 r14 = [r14]

	mov r16 = r17 ;;

	st1 [r15] = r14

	br.cloop.sptk.few 1b ;;

2:

	mov ar.lc = r2

	mov ar.pfs = loc0

	br.ret.sptk.many rp

3:

	adds r14 = 7, in0 ;;

	and r14 = -8, r14 ;;

	cmp.eq p6, p7 = r14, in0

(p7)	br.cond.dptk 0b

	shr.u r18 = in2, 3 ;;

	cmp.ne p6, p7 = 0, r18

(p7)	br.cond.dpnt 5f	;;

(p6)	adds r14 = -1, r18

(p6)	mov r16 = r0

(p6)	mov r17 = r0 ;;

(p6)	mov ar.lc = r14

4:

	shladd r14 = r16, 3, r0

	adds r16 = 1, r17 ;;

	add r15 = r8, r14

	add r14 = in0, r14

	mov r17 = r16 ;;

	ld8 r15 = [r15] ;;

	st8 [r14] = r15

	br.cloop.sptk.few 4b

5:

	and r15 = 7, in2

	shladd r14 = r18, 3, r0

	mov r16 = r0

	mov r18 = r0 ;;

	cmp.eq p6, p7 = 0, r15

	add in0 = r14, in0

	adds r15 = -1, r15

	add r17 = r14, r8

(p6)	br.cond.dpnt 2b	;;

	mov ar.lc = r15

6:

	add r14 = r16, r17

	add r15 = r16, in0

	adds r16 = 1, r18 ;;

	ld1 r14 = [r14]

	mov r18 = r16 ;;

	st1 [r15] = r14

	br.cloop.sptk.few 6b ;;

	mov ar.lc = r2

	mov ar.pfs = loc0

	br.ret.sptk.many rp

memcpy_from_uspace_failover_address:

memcpy_to_uspace_failover_address:

	mov r8 = r0			/* return 0 on failure */

	mov ar.pfs = loc0

	br.ret.sptk.many rp

.global memsetb

memsetb:

	br _memsetb

.global cpu_halt

cpu_halt:

	br cpu_halt

.global panic_printf

panic_printf:

	{

		br.call.sptk.many b0=printf

	}

	br halt

/** Switch to userspace - low level code.

 *

 * @param in0 Userspace entry point address.

 * @param in1 Userspace stack pointer address.

 * @param in2 Userspace register stack pointer address.

 * @param in3 Userspace address of thread uspace_arg_t structure.

 * @param in4 Value to be stored in IPSR.

 * @param in5 Value to be stored in RSC.

 */

.global switch_to_userspace

switch_to_userspace:

	alloc loc0 = ar.pfs, 6, 3, 0, 0

	rsm (PSR_IC_MASK | PSR_I_MASK)		/* disable interruption collection and interrupts */

	srlz.d ;;

	srlz.i ;;

	mov cr.ipsr = in4

	mov cr.iip = in0

	mov r12 = in1

	xor r1 = r1, r1

	/* r2 is defined to hold pcb_ptr - set it to 0 */

	xor r2 = r2, r2

	mov loc1 = cr.ifs

	movl loc2 = PFM_MASK ;;

	and loc1 = loc2, loc1 ;;

	mov cr.ifs = loc1 ;;			/* prevent decrementing BSP by rfi */

	invala

	mov loc1 = ar.rsc ;;

	and loc1 = ~3, loc1 ;;			

	mov ar.rsc = loc1 ;;			/* put RSE into enforced lazy mode */

	flushrs ;;

	mov ar.bspstore = in2 ;;

	mov ar.rsc = in5 ;;

	mov r8 = in3

	rfi ;;