[PATCH] powerpc: Implement support for setting little-endian mode via prctl
[linux-2.6] / arch / alpha / lib / callback_srm.S
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
13 srm_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
36 srm_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
53 nosrm:
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##: \
60 ldgp $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##: \
66 lda $0,-1($31); ret; .end callback_##NAME
67
68 .align 3
69 .globl  srm_fixup
70 .ent    srm_fixup
71 srm_fixup:
72         lda     $0,-1($31)
73         ret
74 .end    srm_fixup
75 #endif /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */
76
77 CALLBACK(puts, CCB_PUTS, 4)
78 CALLBACK(open, CCB_OPEN, 3)
79 CALLBACK(close, CCB_CLOSE, 2)
80 CALLBACK(read, CCB_READ, 5)
81 CALLBACK(open_console, CCB_OPEN_CONSOLE, 1)
82 CALLBACK(close_console, CCB_CLOSE_CONSOLE, 1)
83 CALLBACK(getenv, CCB_GET_ENV, 4)
84 CALLBACK(setenv, CCB_SET_ENV, 4)
85 CALLBACK(getc, CCB_GETC, 2)
86 CALLBACK(reset_term, CCB_RESET_TERM, 2)
87 CALLBACK(term_int, CCB_SET_TERM_INT, 3)
88 CALLBACK(term_ctl, CCB_SET_TERM_CTL, 3)
89 CALLBACK(process_keycode, CCB_PROCESS_KEYCODE, 3)
90 CALLBACK(ioctl, CCB_IOCTL, 6)
91 CALLBACK(write, CCB_WRITE, 5)
92 CALLBACK(reset_env, CCB_RESET_ENV, 4)
93 CALLBACK(save_env, CCB_SAVE_ENV, 1)
94 CALLBACK(pswitch, CCB_PSWITCH, 3)
95 CALLBACK(bios_emul, CCB_BIOS_EMUL, 5)
96         
97 .data
98 __alpha_using_srm:              # For use by bootpheader
99         .long 7                 # value is not 1 for link debugging
100         .weak alpha_using_srm; alpha_using_srm = __alpha_using_srm
101 __callback_init_done:           # For use by bootpheader
102         .long 7                 # value is not 1 for link debugging
103         .weak callback_init_done; callback_init_done = __callback_init_done
104