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