projects/linux·blob master · refs

109 lines · 2.9 KiB

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