callback_srm.S

  1/* SPDX-License-Identifier: GPL-2.0 */
  2/*
  3 *	arch/alpha/lib/callback_srm.S
  4 */
  5
  6#include <linux/export.h>
  7#include <asm/console.h>
  8
  9.text
 10#define HWRPB_CRB_OFFSET 0xc0
 11
 12#if defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC)
 13.align 4
 14srm_dispatch:
 15#if defined(CONFIG_ALPHA_GENERIC)
 16	ldl	$4,alpha_using_srm
 17	beq	$4,nosrm
 18#endif
 19	ldq	$0,hwrpb	# gp is set up by CALLBACK macro.
 20	ldl	$25,0($25)	# Pick up the wrapper data.
 21	mov	$20,$21		# Shift arguments right.
 22	mov	$19,$20
 23	ldq	$1,HWRPB_CRB_OFFSET($0)
 24	mov	$18,$19
 25	mov	$17,$18
 26	mov	$16,$17
 27	addq	$0,$1,$2	# CRB address
 28	ldq	$27,0($2)	# DISPATCH procedure descriptor (VMS call std)
 29	extwl	$25,0,$16	# SRM callback function code
 30	ldq	$3,8($27)	# call address
 31	extwl	$25,2,$25	# argument information (VMS calling std)
 32	jmp	($3)		# Return directly to caller of wrapper.
 33
 34.align 4
 35.globl	srm_fixup
 36.ent	srm_fixup
 37srm_fixup:
 38	ldgp	$29,0($27)
 39#if defined(CONFIG_ALPHA_GENERIC)
 40	ldl	$4,alpha_using_srm
 41	beq	$4,nosrm
 42#endif
 43	ldq	$0,hwrpb
 44	ldq	$1,HWRPB_CRB_OFFSET($0)
 45	addq	$0,$1,$2	# CRB address
 46	ldq	$27,16($2)	# VA of FIXUP procedure descriptor
 47	ldq	$3,8($27)	# call address
 48	lda	$25,2($31)	# two integer arguments
 49	jmp	($3)		# Return directly to caller of srm_fixup.
 50.end    srm_fixup
 51
 52#if defined(CONFIG_ALPHA_GENERIC)
 53.align 3
 54nosrm:
 55	lda	$0,-1($31)
 56	ret
 57#endif
 58
 59#define CALLBACK(NAME, CODE, ARG_CNT) \
 60.align 4; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
 61ldgp $29,0($27); br $25,srm_dispatch; .word CODE, ARG_CNT; .end callback_##NAME
 62
 63#else /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */
 64
 65#define CALLBACK(NAME, CODE, ARG_CNT) \
 66.align 3; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
 67lda $0,-1($31); ret; .end callback_##NAME
 68
 69.align 3
 70.globl	srm_fixup
 71.ent	srm_fixup
 72srm_fixup:
 73	lda	$0,-1($31)
 74	ret
 75.end	srm_fixup
 76#endif /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */
 77
 78CALLBACK(puts, CCB_PUTS, 4)
 79CALLBACK(open, CCB_OPEN, 3)
 80CALLBACK(close, CCB_CLOSE, 2)
 81CALLBACK(read, CCB_READ, 5)
 82CALLBACK(open_console, CCB_OPEN_CONSOLE, 1)
 83CALLBACK(close_console, CCB_CLOSE_CONSOLE, 1)
 84CALLBACK(getenv, CCB_GET_ENV, 4)
 85CALLBACK(setenv, CCB_SET_ENV, 4)
 86CALLBACK(getc, CCB_GETC, 2)
 87CALLBACK(reset_term, CCB_RESET_TERM, 2)
 88CALLBACK(term_int, CCB_SET_TERM_INT, 3)
 89CALLBACK(term_ctl, CCB_SET_TERM_CTL, 3)
 90CALLBACK(process_keycode, CCB_PROCESS_KEYCODE, 3)
 91CALLBACK(ioctl, CCB_IOCTL, 6)
 92CALLBACK(write, CCB_WRITE, 5)
 93CALLBACK(reset_env, CCB_RESET_ENV, 4)
 94CALLBACK(save_env, CCB_SAVE_ENV, 1)
 95CALLBACK(pswitch, CCB_PSWITCH, 3)
 96CALLBACK(bios_emul, CCB_BIOS_EMUL, 5)
 97
 98EXPORT_SYMBOL(callback_getenv)
 99EXPORT_SYMBOL(callback_setenv)
100EXPORT_SYMBOL(callback_save_env)
101	
102.data
103__alpha_using_srm:		# For use by bootpheader
104	.long 7			# value is not 1 for link debugging
105	.weak alpha_using_srm; alpha_using_srm = __alpha_using_srm
106__callback_init_done:		# For use by bootpheader
107	.long 7			# value is not 1 for link debugging
108	.weak callback_init_done; callback_init_done = __callback_init_done
109