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/*
 *      arch/alpha/lib/callback_srm.S
 */

#include <linux/config.h>
#include <asm/console.h>

.text
#define HWRPB_CRB_OFFSET 0xc0

#if defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC)
.align 4
srm_dispatch:
#if defined(CONFIG_ALPHA_GENERIC)
        ldl     $4,alpha_using_srm
        beq     $4,nosrm
#endif
        ldq     $0,hwrpb        # gp is set up by CALLBACK macro.
        ldl     $25,0($25)      # Pick up the wrapper data.
        mov     $20,$21         # Shift arguments right.
        mov     $19,$20
        ldq     $1,HWRPB_CRB_OFFSET($0)
        mov     $18,$19
        mov     $17,$18
        mov     $16,$17
        addq    $0,$1,$2        # CRB address
        ldq     $27,0($2)       # DISPATCH procedure descriptor (VMS call std)
        extwl   $25,0,$16       # SRM callback function code
        ldq     $3,8($27)       # call address
        extwl   $25,2,$25       # argument information (VMS calling std)
        jmp     ($3)            # Return directly to caller of wrapper.

.align 4
.globl  srm_fixup
.ent    srm_fixup
srm_fixup:
        ldgp    $29,0($27)
#if defined(CONFIG_ALPHA_GENERIC)
        ldl     $4,alpha_using_srm
        beq     $4,nosrm
#endif
        ldq     $0,hwrpb
        ldq     $1,HWRPB_CRB_OFFSET($0)
        addq    $0,$1,$2        # CRB address
        ldq     $27,16($2)      # VA of FIXUP procedure descriptor
        ldq     $3,8($27)       # call address
        lda     $25,2($31)      # two integer arguments
        jmp     ($3)            # Return directly to caller of srm_fixup.
.end    srm_fixup

#if defined(CONFIG_ALPHA_GENERIC)
.align 3
nosrm:
        lda     $0,-1($31)
        ret
#endif

#define CALLBACK(NAME, CODE, ARG_CNT) \
.align 4; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
ldgp $29,0($27); br $25,srm_dispatch; .word CODE, ARG_CNT; .end callback_##NAME

#else /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */

#define CALLBACK(NAME, CODE, ARG_CNT) \
.align 3; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
lda $0,-1($31); ret; .end callback_##NAME

.align 3
.globl  srm_fixup
.ent    srm_fixup
srm_fixup:
        lda     $0,-1($31)
        ret
.end    srm_fixup
#endif /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */

CALLBACK(puts, CCB_PUTS, 4)
CALLBACK(open, CCB_OPEN, 3)
CALLBACK(close, CCB_CLOSE, 2)
CALLBACK(read, CCB_READ, 5)
CALLBACK(open_console, CCB_OPEN_CONSOLE, 1)
CALLBACK(close_console, CCB_CLOSE_CONSOLE, 1)
CALLBACK(getenv, CCB_GET_ENV, 4)
CALLBACK(setenv, CCB_SET_ENV, 4)
CALLBACK(getc, CCB_GETC, 2)
CALLBACK(reset_term, CCB_RESET_TERM, 2)
CALLBACK(term_int, CCB_SET_TERM_INT, 3)
CALLBACK(term_ctl, CCB_SET_TERM_CTL, 3)
CALLBACK(process_keycode, CCB_PROCESS_KEYCODE, 3)
CALLBACK(ioctl, CCB_IOCTL, 6)
CALLBACK(write, CCB_WRITE, 5)
CALLBACK(reset_env, CCB_RESET_ENV, 4)
CALLBACK(save_env, CCB_SAVE_ENV, 1)
CALLBACK(pswitch, CCB_PSWITCH, 3)
CALLBACK(bios_emul, CCB_BIOS_EMUL, 5)
        
.data
__alpha_using_srm:              # For use by bootpheader
        .long 7                 # value is not 1 for link debugging
        .weak alpha_using_srm; alpha_using_srm = __alpha_using_srm
__callback_init_done:           # For use by bootpheader
        .long 7                 # value is not 1 for link debugging
        .weak callback_init_done; callback_init_done = __callback_init_done