arch/alpha/lib/callback_srm.S

   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
  12 srm_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
  35 srm_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
  52 nosrm:
  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##: \
  59 ldgp $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##: \
  65 lda $0,-1($31); ret; .end callback_##NAME
  66
  67 .align 3
  68 .globl  srm_fixup
  69 .ent    srm_fixup
  70 srm_fixup:
  71         lda     $0,-1($31)
  72         ret
  73 .end    srm_fixup
  74 #endif /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */
  75
  76 CALLBACK(puts, CCB_PUTS, 4)
  77 CALLBACK(open, CCB_OPEN, 3)
  78 CALLBACK(close, CCB_CLOSE, 2)
  79 CALLBACK(read, CCB_READ, 5)
  80 CALLBACK(open_console, CCB_OPEN_CONSOLE, 1)
  81 CALLBACK(close_console, CCB_CLOSE_CONSOLE, 1)
  82 CALLBACK(getenv, CCB_GET_ENV, 4)
  83 CALLBACK(setenv, CCB_SET_ENV, 4)
  84 CALLBACK(getc, CCB_GETC, 2)
  85 CALLBACK(reset_term, CCB_RESET_TERM, 2)
  86 CALLBACK(term_int, CCB_SET_TERM_INT, 3)
  87 CALLBACK(term_ctl, CCB_SET_TERM_CTL, 3)
  88 CALLBACK(process_keycode, CCB_PROCESS_KEYCODE, 3)
  89 CALLBACK(ioctl, CCB_IOCTL, 6)
  90 CALLBACK(write, CCB_WRITE, 5)
  91 CALLBACK(reset_env, CCB_RESET_ENV, 4)
  92 CALLBACK(save_env, CCB_SAVE_ENV, 1)
  93 CALLBACK(pswitch, CCB_PSWITCH, 3)
  94 CALLBACK(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