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