/*
 * arch/ppc64/kernel/hvCall.S
 *
 *
 * This file contains the code to perform calls to the
 * iSeries LPAR hypervisor
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include "ppc_asm.h"
#include <asm/processor.h>
#include <linux/config.h>

	.text

/* 
 * Hypervisor call
 * 
 * Invoke the iSeries hypervisor via the System Call instruction
 * Parameters are passed to this routine in registers r3 - r10
 * 
 * r3 contains the HV function to be called
 * r4-r10 contain the operands to the hypervisor function
 *
 */

_GLOBAL(HvCall)
_GLOBAL(HvCall0)
_GLOBAL(HvCall1)
_GLOBAL(HvCall2)
_GLOBAL(HvCall3)
_GLOBAL(HvCall4)
_GLOBAL(HvCall5)
_GLOBAL(HvCall6)
_GLOBAL(HvCall7)


	mfcr	r0
	std	r0,-8(r1)
	stdu	r1,-(STACK_FRAME_OVERHEAD+16)(r1)
	
	/* r0 = 0xffffffffffffffff indicates a hypervisor call */
	
	li	r0,-1
	
	/* Invoke the hypervisor */

	sc

	ld	r1,0(r1)
	ld	r0,-8(r1)
	mtcrf	0xff,r0

	/*  return to caller, return value in r3 */
	
	blr

_GLOBAL(HvCall0Ret16)
_GLOBAL(HvCall1Ret16)
_GLOBAL(HvCall2Ret16)
_GLOBAL(HvCall3Ret16)
_GLOBAL(HvCall4Ret16)
_GLOBAL(HvCall5Ret16)
_GLOBAL(HvCall6Ret16)
_GLOBAL(HvCall7Ret16)

	mfcr	r0
	std	r0,-8(r1)
	std	r31,-16(r1)
	stdu	r1,-(STACK_FRAME_OVERHEAD+32)(r1)

	mr	r31,r4
	li	r0,-1
	mr	r4,r5
	mr	r5,r6
	mr	r6,r7
	mr	r7,r8
	mr	r8,r9
	mr	r9,r10

	sc

	std	r3,0(r31)
	std	r4,8(r31)

	mr	r3,r5

	ld	r1,0(r1)
	ld	r0,-8(r1)
	mtcrf	0xff,r0
	ld	r31,-16(r1)
	
	blr