arch/alpha/lib/callback_srm.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *      arch/alpha/lib/callback_srm.S
   4  */
   5
   6 #include <asm/console.h>
   7 #include <asm/export.h>
   8
   9 .text
  10 #define HWRPB_CRB_OFFSET 0xc0
  11
  12 #if defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC)
  13 .align 4
  14 srm_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
  37 srm_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
  54 nosrm:
  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##: \
  61 ldgp $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##: \
  67 lda $0,-1($31); ret; .end callback_##NAME
  68
  69 .align 3
  70 .globl  srm_fixup
  71 .ent    srm_fixup
  72 srm_fixup:
  73         lda     $0,-1($31)
  74         ret
  75 .end    srm_fixup
  76 #endif /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */
  77
  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)
  97
  98 EXPORT_SYMBOL(callback_getenv)
  99 EXPORT_SYMBOL(callback_setenv)
 100 EXPORT_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