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