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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * arch/alpha/lib/callback_srm.S
3 */
4
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#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