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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/alpha/lib/callback_srm.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 *	arch/alpha/lib/callback_srm.S

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 */

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#include <linux/export.h>

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#include <asm/console.h>

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.text

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#define HWRPB_CRB_OFFSET 0xc0

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#if defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC)

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.align 4

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srm_dispatch:

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#if defined(CONFIG_ALPHA_GENERIC)

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	ldl	$4,alpha_using_srm

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	beq	$4,nosrm

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#endif

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	ldq	$0,hwrpb	# gp is set up by CALLBACK macro.

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	ldl	$25,0($25)	# Pick up the wrapper data.

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	mov	$20,$21		# Shift arguments right.

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	mov	$19,$20

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	ldq	$1,HWRPB_CRB_OFFSET($0)

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	mov	$18,$19

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	mov	$17,$18

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	mov	$16,$17

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	addq	$0,$1,$2	# CRB address

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	ldq	$27,0($2)	# DISPATCH procedure descriptor (VMS call std)

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	extwl	$25,0,$16	# SRM callback function code

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	ldq	$3,8($27)	# call address

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	extwl	$25,2,$25	# argument information (VMS calling std)

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	jmp	($3)		# Return directly to caller of wrapper.

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.align 4

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.globl	srm_fixup

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.ent	srm_fixup

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srm_fixup:

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	ldgp	$29,0($27)

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#if defined(CONFIG_ALPHA_GENERIC)

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	ldl	$4,alpha_using_srm

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	beq	$4,nosrm

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#endif

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	ldq	$0,hwrpb

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	ldq	$1,HWRPB_CRB_OFFSET($0)

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	addq	$0,$1,$2	# CRB address

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	ldq	$27,16($2)	# VA of FIXUP procedure descriptor

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	ldq	$3,8($27)	# call address

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	lda	$25,2($31)	# two integer arguments

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	jmp	($3)		# Return directly to caller of srm_fixup.

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.end    srm_fixup

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#if defined(CONFIG_ALPHA_GENERIC)

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.align 3

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nosrm:

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	lda	$0,-1($31)

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	ret

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#endif

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#define CALLBACK(NAME, CODE, ARG_CNT) \

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.align 4; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \

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ldgp $29,0($27); br $25,srm_dispatch; .word CODE, ARG_CNT; .end callback_##NAME

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#else /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */

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#define CALLBACK(NAME, CODE, ARG_CNT) \

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.align 3; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \

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lda $0,-1($31); ret; .end callback_##NAME

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.align 3

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.globl	srm_fixup

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.ent	srm_fixup

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srm_fixup:

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	lda	$0,-1($31)

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	ret

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.end	srm_fixup

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#endif /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */

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CALLBACK(puts, CCB_PUTS, 4)

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CALLBACK(open, CCB_OPEN, 3)

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CALLBACK(close, CCB_CLOSE, 2)

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CALLBACK(read, CCB_READ, 5)

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CALLBACK(open_console, CCB_OPEN_CONSOLE, 1)

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CALLBACK(close_console, CCB_CLOSE_CONSOLE, 1)

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CALLBACK(getenv, CCB_GET_ENV, 4)

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CALLBACK(setenv, CCB_SET_ENV, 4)

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CALLBACK(getc, CCB_GETC, 2)

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CALLBACK(reset_term, CCB_RESET_TERM, 2)

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CALLBACK(term_int, CCB_SET_TERM_INT, 3)

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CALLBACK(term_ctl, CCB_SET_TERM_CTL, 3)

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CALLBACK(process_keycode, CCB_PROCESS_KEYCODE, 3)

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CALLBACK(ioctl, CCB_IOCTL, 6)

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CALLBACK(write, CCB_WRITE, 5)

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CALLBACK(reset_env, CCB_RESET_ENV, 4)

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CALLBACK(save_env, CCB_SAVE_ENV, 1)

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CALLBACK(pswitch, CCB_PSWITCH, 3)

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CALLBACK(bios_emul, CCB_BIOS_EMUL, 5)

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EXPORT_SYMBOL(callback_getenv)

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EXPORT_SYMBOL(callback_setenv)

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EXPORT_SYMBOL(callback_save_env)

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.data

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__alpha_using_srm:		# For use by bootpheader

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	.long 7			# value is not 1 for link debugging

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	.weak alpha_using_srm; alpha_using_srm = __alpha_using_srm

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__callback_init_done:		# For use by bootpheader

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	.long 7			# value is not 1 for link debugging

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	.weak callback_init_done; callback_init_done = __callback_init_done

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