1/* 2 * arch/alpha/lib/callback_srm.S 3 */ 4 5#include <asm/console.h> 6#include <asm/export.h> 7 8.text 9#define HWRPB_CRB_OFFSET 0xc0 10 11#if defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) 12.align 4 13srm_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 36srm_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 53nosrm: 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##: \ 60ldgp $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##: \ 66lda $0,-1($31); ret; .end callback_##NAME 67 68.align 3 69.globl srm_fixup 70.ent srm_fixup 71srm_fixup: 72 lda $0,-1($31) 73 ret 74.end srm_fixup 75#endif /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */ 76 77CALLBACK(puts, CCB_PUTS, 4) 78CALLBACK(open, CCB_OPEN, 3) 79CALLBACK(close, CCB_CLOSE, 2) 80CALLBACK(read, CCB_READ, 5) 81CALLBACK(open_console, CCB_OPEN_CONSOLE, 1) 82CALLBACK(close_console, CCB_CLOSE_CONSOLE, 1) 83CALLBACK(getenv, CCB_GET_ENV, 4) 84CALLBACK(setenv, CCB_SET_ENV, 4) 85CALLBACK(getc, CCB_GETC, 2) 86CALLBACK(reset_term, CCB_RESET_TERM, 2) 87CALLBACK(term_int, CCB_SET_TERM_INT, 3) 88CALLBACK(term_ctl, CCB_SET_TERM_CTL, 3) 89CALLBACK(process_keycode, CCB_PROCESS_KEYCODE, 3) 90CALLBACK(ioctl, CCB_IOCTL, 6) 91CALLBACK(write, CCB_WRITE, 5) 92CALLBACK(reset_env, CCB_RESET_ENV, 4) 93CALLBACK(save_env, CCB_SAVE_ENV, 1) 94CALLBACK(pswitch, CCB_PSWITCH, 3) 95CALLBACK(bios_emul, CCB_BIOS_EMUL, 5) 96 97EXPORT_SYMBOL(callback_getenv) 98EXPORT_SYMBOL(callback_setenv) 99EXPORT_SYMBOL(callback_save_env) 100 101.data 102__alpha_using_srm: # For use by bootpheader 103 .long 7 # value is not 1 for link debugging 104 .weak alpha_using_srm; alpha_using_srm = __alpha_using_srm 105__callback_init_done: # For use by bootpheader 106 .long 7 # value is not 1 for link debugging 107 .weak callback_init_done; callback_init_done = __callback_init_done 108 109