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