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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/drivers/char/hw_random/n2-asm.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/* n2-asm.S: Niagara2 RNG hypervisor call assembler.

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 *

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 * Copyright (C) 2008 David S. Miller <[email protected]>

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 */

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#include <linux/linkage.h>

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#include <asm/hypervisor.h>

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#include "n2rng.h"

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	.text

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ENTRY(sun4v_rng_get_diag_ctl)

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	mov	HV_FAST_RNG_GET_DIAG_CTL, %o5

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	ta	HV_FAST_TRAP

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	retl

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	 nop

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ENDPROC(sun4v_rng_get_diag_ctl)

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ENTRY(sun4v_rng_ctl_read_v1)

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	mov	%o1, %o3

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	mov	%o2, %o4

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	mov	HV_FAST_RNG_CTL_READ, %o5

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	ta	HV_FAST_TRAP

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	stx	%o1, [%o3]

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	retl

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	 stx	%o2, [%o4]

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ENDPROC(sun4v_rng_ctl_read_v1)

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ENTRY(sun4v_rng_ctl_read_v2)

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	save	%sp, -192, %sp

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	mov	%i0, %o0

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	mov	%i1, %o1

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	mov	HV_FAST_RNG_CTL_READ, %o5

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	ta	HV_FAST_TRAP

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	stx	%o1, [%i2]

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	stx	%o2, [%i3]

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	stx	%o3, [%i4]

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	stx	%o4, [%i5]

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	ret

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	restore	%g0, %o0, %o0

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ENDPROC(sun4v_rng_ctl_read_v2)

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ENTRY(sun4v_rng_ctl_write_v1)

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	mov	%o3, %o4

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	mov	HV_FAST_RNG_CTL_WRITE, %o5

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	ta	HV_FAST_TRAP

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	retl

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	 stx	%o1, [%o4]

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ENDPROC(sun4v_rng_ctl_write_v1)

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ENTRY(sun4v_rng_ctl_write_v2)

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	mov	HV_FAST_RNG_CTL_WRITE, %o5

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	ta	HV_FAST_TRAP

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	retl

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	 nop

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ENDPROC(sun4v_rng_ctl_write_v2)

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ENTRY(sun4v_rng_data_read_diag_v1)

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	mov	%o2, %o4

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	mov	HV_FAST_RNG_DATA_READ_DIAG, %o5

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	ta	HV_FAST_TRAP

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	retl

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	 stx	%o1, [%o4]

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ENDPROC(sun4v_rng_data_read_diag_v1)

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ENTRY(sun4v_rng_data_read_diag_v2)

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	mov	%o3, %o4

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	mov	HV_FAST_RNG_DATA_READ_DIAG, %o5

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	ta	HV_FAST_TRAP

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	retl

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	 stx	%o1, [%o4]

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ENDPROC(sun4v_rng_data_read_diag_v2)

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ENTRY(sun4v_rng_data_read)

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	mov	%o1, %o4

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	mov	HV_FAST_RNG_DATA_READ, %o5

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	ta	HV_FAST_TRAP

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	retl

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	 stx	%o1, [%o4]

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ENDPROC(sun4v_rng_data_read)

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