1 /* SPDX-License-Identifier: GPL-2.0 */
3 * arch/alpha/lib/callback_srm.S
6 #include <asm/console.h>
7 #include <asm/export.h>
10 #define HWRPB_CRB_OFFSET 0xc0
12 #if defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC)
15 #if defined(CONFIG_ALPHA_GENERIC)
16 ldl $4,alpha_using_srm
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.
23 ldq $1,HWRPB_CRB_OFFSET($0)
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.
39 #if defined(CONFIG_ALPHA_GENERIC)
40 ldl $4,alpha_using_srm
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.
52 #if defined(CONFIG_ALPHA_GENERIC)
59 #define CALLBACK(NAME, CODE, ARG_CNT) \
60 .align 4; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
61 ldgp $29,0($27); br $25,srm_dispatch; .word CODE, ARG_CNT; .end callback_##NAME
63 #else /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */
65 #define CALLBACK(NAME, CODE, ARG_CNT) \
66 .align 3; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
67 lda $0,-1($31); ret; .end callback_##NAME
76 #endif /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */
78 CALLBACK(puts, CCB_PUTS, 4)
79 CALLBACK(open, CCB_OPEN, 3)
80 CALLBACK(close, CCB_CLOSE, 2)
81 CALLBACK(read, CCB_READ, 5)
82 CALLBACK(open_console, CCB_OPEN_CONSOLE, 1)
83 CALLBACK(close_console, CCB_CLOSE_CONSOLE, 1)
84 CALLBACK(getenv, CCB_GET_ENV, 4)
85 CALLBACK(setenv, CCB_SET_ENV, 4)
86 CALLBACK(getc, CCB_GETC, 2)
87 CALLBACK(reset_term, CCB_RESET_TERM, 2)
88 CALLBACK(term_int, CCB_SET_TERM_INT, 3)
89 CALLBACK(term_ctl, CCB_SET_TERM_CTL, 3)
90 CALLBACK(process_keycode, CCB_PROCESS_KEYCODE, 3)
91 CALLBACK(ioctl, CCB_IOCTL, 6)
92 CALLBACK(write, CCB_WRITE, 5)
93 CALLBACK(reset_env, CCB_RESET_ENV, 4)
94 CALLBACK(save_env, CCB_SAVE_ENV, 1)
95 CALLBACK(pswitch, CCB_PSWITCH, 3)
96 CALLBACK(bios_emul, CCB_BIOS_EMUL, 5)
98 EXPORT_SYMBOL(callback_getenv)
99 EXPORT_SYMBOL(callback_setenv)
100 EXPORT_SYMBOL(callback_save_env)
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