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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/powerpc/platforms/iseries/hvcall.S
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/*

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 * This file contains the code to perform calls to the

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 * iSeries LPAR hypervisor

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 *

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 * This program is free software; you can redistribute it and/or

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 * modify it under the terms of the GNU General Public License

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 * as published by the Free Software Foundation; either version

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 * 2 of the License, or (at your option) any later version.

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 */

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#include <asm/ppc_asm.h>

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#include <asm/processor.h>

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#include <asm/ptrace.h>		/* XXX for STACK_FRAME_OVERHEAD */

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	.text

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/*

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 * Hypervisor call

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 *

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 * Invoke the iSeries hypervisor via the System Call instruction

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 * Parameters are passed to this routine in registers r3 - r10

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 *

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 * r3 contains the HV function to be called

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 * r4-r10 contain the operands to the hypervisor function

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 *

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 */

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_GLOBAL(HvCall)

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_GLOBAL(HvCall0)

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_GLOBAL(HvCall1)

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_GLOBAL(HvCall2)

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_GLOBAL(HvCall3)

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_GLOBAL(HvCall4)

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_GLOBAL(HvCall5)

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_GLOBAL(HvCall6)

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_GLOBAL(HvCall7)

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	mfcr	r0

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	std	r0,-8(r1)

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	stdu	r1,-(STACK_FRAME_OVERHEAD+16)(r1)

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	/* r0 = 0xffffffffffffffff indicates a hypervisor call */

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	li	r0,-1

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	/* Invoke the hypervisor */

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	sc

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	ld	r1,0(r1)

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	ld	r0,-8(r1)

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	mtcrf	0xff,r0

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

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	blr

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_GLOBAL(HvCall0Ret16)

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_GLOBAL(HvCall1Ret16)

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_GLOBAL(HvCall2Ret16)

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_GLOBAL(HvCall3Ret16)

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_GLOBAL(HvCall4Ret16)

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_GLOBAL(HvCall5Ret16)

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_GLOBAL(HvCall6Ret16)

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_GLOBAL(HvCall7Ret16)

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	mfcr	r0

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	std	r0,-8(r1)

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	std	r31,-16(r1)

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	stdu	r1,-(STACK_FRAME_OVERHEAD+32)(r1)

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	mr	r31,r4

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	li	r0,-1

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	mr	r4,r5

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	mr	r5,r6

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	mr	r6,r7

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	mr	r7,r8

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	mr	r8,r9

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	mr	r9,r10

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	sc

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	std	r3,0(r31)

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	std	r4,8(r31)

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	mr	r3,r5

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	ld	r1,0(r1)

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	ld	r0,-8(r1)

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	mtcrf	0xff,r0

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	ld	r31,-16(r1)

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	blr

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