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/*
* tbipcx.S
*
* Copyright (C) 2001, 2002, 2007, 2009, 2012 Imagination Technologies.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation.
*
* Asyncronous trigger handling including exceptions
*/
.file "tbipcx.S"
#include <asm/metag_regs.h>
#include <asm/tbx.h>
/* BEGIN HACK */
/* define these for now while doing inital conversion to GAS
will fix properly later */
/* Signal identifiers always have the TBID_SIGNAL_BIT set and contain the
following related bit-fields */
#define TBID_SIGNUM_S 2
/* END HACK */
#ifdef METAC_1_0
/* Ax.4 is saved in TBICTX */
#define A0_4 ,A0.4
#else
/* Ax.4 is NOT saved in TBICTX */
#define A0_4
#endif
/* Size of the TBICTX structure */
#define TBICTX_BYTES ((TBICTX_AX_REGS*8)+TBICTX_AX)
#ifdef METAC_1_1
#ifndef BOOTROM
#ifndef SPECIAL_BUILD
/* Jump straight into the boot ROM version of this code */
#define CODE_USES_BOOTROM
#endif
#endif
#endif
/* Define space needed for CATCH buffer state in traditional units */
#define CATCH_ENTRIES 5
#define CATCH_ENTRY_BYTES 16
#ifndef CODE_USES_BOOTROM
#define A0GblIStP A0.15 /* PTBICTX for current thread in PRIV system */
#define A1GblIGbP A1.15 /* Interrupt A1GbP value in PRIV system */
#endif
/*
* TBIRES __TBIASyncTrigger( TBIRES State )
*/
.text
.balign 4
.global ___TBIASyncTrigger
.type ___TBIASyncTrigger,function
___TBIASyncTrigger:
#ifdef CODE_USES_BOOTROM
MOVT D0Re0,#HI(LINCORE_BASE)
JUMP D0Re0,#0xA0
#else
MOV D0FrT,A0FrP /* Boing entry sequence */
ADD A0FrP,A0StP,#0
SETL [A0StP++],D0FrT,D1RtP
MOV D0Re0,PCX /* Check for repeat call */
MOVT D0FrT,#HI(___TBIBoingRTI+4)
ADD D0FrT,D0FrT,#LO(___TBIBoingRTI+4)
CMP D0Re0,D0FrT
BEQ ___TBIBoingExit /* Already set up - come out */
ADD D1Ar1,D1Ar1,#7 /* PRIV system stack here */
MOV A0.2,A0StP /* else push context here */
MOVS D0Re0,D0Ar2 /* Return in user mode? */
ANDMB D1Ar1,D1Ar1,#0xfff8 /* align priv stack to 64-bit */
MOV D1Re0,D1Ar1 /* and set result to arg */
MOVMI A0.2,D1Ar1 /* use priv stack if PRIV set */
/*
* Generate an initial TBICTX to return to our own current call context
*/
MOVT D1Ar5,#HI(___TBIBoingExit) /* Go here to return */
ADD D1Ar5,D1Ar5,#LO(___TBIBoingExit)
ADD A0.3,A0.2,#TBICTX_DX /* DX Save area */
ANDT D0Ar2,D0Ar2,#TBICTX_PRIV_BIT /* Extract PRIV bit */
MOVT D0Ar6,#TBICTX_SOFT_BIT /* Only soft thread state */
ADD D0Ar6,D0Ar6,D0Ar2 /* Add in PRIV bit if requested */
SETL [A0.2],D0Ar6,D1Ar5 /* Push header fields */
ADD D0FrT,A0.2,#TBICTX_AX /* Address AX save area */
MSETL [A0.3],D0Re0,D0Ar6,D0Ar4,D0Ar2,D0FrT,D0.5,D0.6,D0.7
MOV D0Ar6,#0
MOV D1Ar5,#0
SETL [A0.3++],D0Ar6,D1Ar5 /* Zero CT register states */
SETL [A0.3++],D0Ar6,D1Ar5
MSETL [D0FrT],A0StP,A0FrP,A0.2,A0.3 A0_4 /* Save AX regs */
MOV A0FrP,A0.2 /* Restore me! */
B ___TBIResume
.size ___TBIASyncTrigger,.-___TBIASyncTrigger
/*
* Optimised return to handler for META Core
*/
___TBIBoingRTH:
RTH /* Go to background level */
MOVT A0.2, #HI($Lpcx_target)
ADD A0.2,A0.2,#LO($Lpcx_target)
MOV PCX,A0.2 /* Setup PCX for interrupts */
MOV PC,D1Re0 /* Jump to handler */
/*
* This is where the code below needs to jump to wait for outermost interrupt
* event in a non-privilege mode system (single shared interrupt stack).
*/
___TBIBoingPCX:
MGETL A0StP,A0FrP,A0.2,A0.3 A0_4,[D1Re0] /* Restore AX regs */
MOV TXSTATUS,D0Re0 /* Restore flags */
GETL D0Re0,D1Re0,[D1Re0+#TBICTX_DX-TBICTX_BYTES]
___TBIBoingRTI:
RTI /* Wait for interrupt */
$Lpcx_target:
/*
* Save initial interrupt state on current stack
*/
SETL [A0StP+#TBICTX_DX],D0Re0,D1Re0 /* Save key registers */
ADD D1Re0,A0StP,#TBICTX_AX /* Address AX save area */
MOV D0Re0,TXSTATUS /* Read TXSTATUS into D0Re0 */
MOV TXSTATUS,#0 /* Clear TXSTATUS */
MSETL [D1Re0],A0StP,A0FrP,A0.2,A0.3 A0_4 /* Save AX critical regs */
/*
* Register state at this point is-
*
* D0Re0 - Old TXSTATUS with PRIV and CBUF bits set if appropriate
* A0StP - Is call stack frame and base of TBICTX being generated
* A1GbP - Is valid static access link
*/
___TBIBoing:
LOCK0 /* Make sure we have no locks! */
ADD A1.2,A0StP,#TBICTX_DX+(8*1) /* Address DX.1 save area */
MOV A0FrP,A0StP /* Setup frame pointer */
MSETL [A1.2],D0Ar6,D0Ar4,D0Ar2,D0FrT,D0.5,D0.6,D0.7
MOV D0Ar4,TXRPT /* Save critical CT regs */
MOV D1Ar3,TXBPOBITS
MOV D1Ar1,TXDIVTIME /* Calc catch buffer pSrc */
MOV D0Ar2,TXMODE
MOV TXMODE,#0 /* Clear TXMODE */
#ifdef TXDIVTIME_RPDIRTY_BIT
TSTT D1Ar1,#HI(TXDIVTIME_RPDIRTY_BIT)/* NZ = RPDIRTY */
MOVT D0Ar6,#TBICTX_CBRP_BIT
ORNZ D0Re0,D0Re0,D0Ar6 /* Set CBRP if RPDIRTY set */
#endif
MSETL [A1.2],D0Ar4,D0Ar2 /* Save CT regs state */
MOV D0Ar2,D0Re0 /* Copy TXSTATUS */
ANDMT D0Ar2,D0Ar2,#TBICTX_CBUF_BIT+TBICTX_CBRP_BIT
#ifdef TBI_1_4
MOVT D1Ar1,#TBICTX_FPAC_BIT /* Copy FPActive into FPAC */
TSTT D0Re0,#HI(TXSTATUS_FPACTIVE_BIT)
ORNZ D0Ar2,D0Ar2,D1Ar1
#endif
MOV D1Ar1,PCX /* Read CurrPC */
ORT D0Ar2,D0Ar2,#TBICTX_CRIT_BIT /* SaveMask + CRIT bit */
SETL [A0FrP+#TBICTX_Flags],D0Ar2,D1Ar1 /* Set pCtx header fields */
/*
* Completed context save, now we need to make a call to an interrupt handler
*
* D0Re0 - holds PRIV, WAIT, CBUF flags, HALT reason if appropriate
* A0FrP - interrupt stack frame and base of TBICTX being generated
* A0StP - same as A0FrP
*/
___TBIBoingWait:
/* Reserve space for TBICTX and CBUF */
ADD A0StP,A0StP,#TBICTX_BYTES+(CATCH_ENTRY_BYTES*CATCH_ENTRIES)
MOV D0Ar4,TXSTATI /* Read the Triggers data */
MOV D1Ar3,TXDIVTIME /* Read IRQEnc bits */
MOV D0Ar2,D0Re0 /* Copy PRIV and WAIT flags */
ANDT D0Ar2,D0Ar2,#TBICTX_PRIV_BIT+TBICTX_WAIT_BIT+TBICTX_CBUF_BIT
#ifdef TBI_1_4
MOVT D1Ar5,#TBICTX_FPAC_BIT /* Copy FPActive into FPAC */
TSTT D0Re0,#HI(TXSTATUS_FPACTIVE_BIT)
ORNZ D0Ar2,D0Ar2,D1Ar5
#endif
ANDT D1Ar3,D1Ar3,#HI(TXDIVTIME_IRQENC_BITS)
LSR D1Ar3,D1Ar3,#TXDIVTIME_IRQENC_S
AND TXSTATI,D0Ar4,#TXSTATI_BGNDHALT_BIT/* Ack any HALT seen */
ANDS D0Ar4,D0Ar4,#0xFFFF-TXSTATI_BGNDHALT_BIT /* Only seen HALT? */
ORT D0Ar2,D0Ar2,#TBICTX_CRIT_BIT /* Set CRIT */
#ifndef BOOTROM
MOVT A1LbP,#HI(___pTBIs)
ADD A1LbP,A1LbP,#LO(___pTBIs)
GETL D1Ar5,D0Ar6,[A1LbP] /* D0Ar6 = ___pTBIs[1] */
#else
/*
* For BOOTROM support ___pTBIs must be allocated at offset 0 vs A1GbP
*/
GETL D1Ar5,D0Ar6,[A1GbP] /* D0Ar6 = ___pTBIs[1] */
#endif
BZ ___TBIBoingHalt /* Yes: Service HALT */
/*
* Encode interrupt as signal vector, strip away same/lower TXMASKI bits
*/
MOV D1Ar1,#1 /* Generate mask for this bit */
MOV D0Re0,TXMASKI /* Get interrupt mask */
LSL TXSTATI,D1Ar1,D1Ar3 /* Acknowledge trigger */
AND TXMASKI,D0Re0,#TXSTATI_BGNDHALT_BIT /* Only allow HALTs */
OR D0Ar2,D0Ar2,D0Re0 /* Set TBIRES.Sig.TrigMask */
ADD D1Ar3,D1Ar3,#TBID_SIGNUM_TRT /* Offset into interrupt sigs */
LSL D0Re0,D1Ar3,#TBID_SIGNUM_S /* Generate offset from SigNum */
/*
* This is a key moment we are about to call the handler, register state is
* as follows-
*
* D0Re0 - Handler vector (SigNum<<TBID_SIGNUM_S)
* D0Ar2 - TXMASKI:TBICTX_CRIT_BIT with optional CBUF and PRIV bits
* D1Ar3 - SigNum
* D0Ar4 - State read from TXSTATI
* D1Ar5 - Inst for SWITCH trigger case only, otherwise undefined
* D0Ar6 - pTBI
*/
___TBIBoingVec:
ADD D0Re0,D0Re0,#TBI_fnSigs /* Offset into signal table */
GETD D1Re0,[D0Ar6+D0Re0] /* Get address for Handler */
/*
* Call handler at interrupt level, when it returns simply resume execution
* of state indicated by D1Re0.
*/
MOV D1Ar1,A0FrP /* Pass in pCtx */
CALLR D1RtP,___TBIBoingRTH /* Use RTH to invoke handler */
/*
* Perform critical state restore and execute background thread.
*
* A0FrP - is pointer to TBICTX structure to resume
* D0Re0 - contains additional TXMASKI triggers
*/
.text
.balign 4
#ifdef BOOTROM
.global ___TBIResume
#endif
___TBIResume:
/*
* New META IP method
*/
RTH /* Go to interrupt level */
MOV D0Ar4,TXMASKI /* Read TXMASKI */
OR TXMASKI,D0Ar4,D0Re0 /* -Write-Modify TXMASKI */
GETL D0Re0,D1Re0,[A0FrP+#TBICTX_Flags]/* Get Flags:SaveMask, CurrPC */
MOV A0StP,A0FrP /* Position stack pointer */
MOV D0Ar2,TXPOLLI /* Read pending triggers */
MOV PCX,D1Re0 /* Set resumption PC */
TST D0Ar2,#0xFFFF /* Any pending triggers? */
BNZ ___TBIBoingWait /* Yes: Go for triggers */
TSTT D0Re0,#TBICTX_WAIT_BIT /* Do we WAIT anyway? */
BNZ ___TBIBoingWait /* Yes: Go for triggers */
LSLS D1Ar5,D0Re0,#1 /* Test XCBF (MI) & PRIV (CS)? */
ADD D1Re0,A0FrP,#TBICTX_CurrRPT /* Address CT save area */
ADD A0StP,A0FrP,#TBICTX_DX+(8*1) /* Address DX.1 save area */
MGETL A0.2,A0.3,[D1Re0] /* Get CT reg states */
MOV D1Ar3,A1.3 /* Copy old TXDIVTIME */
BPL ___TBIResCrit /* No: Skip logic */
ADD D0Ar4,A0FrP,#TBICTX_BYTES /* Source is after TBICTX */
ANDST D1Ar3,D1Ar3,#HI(TXDIVTIME_RPMASK_BITS)/* !Z if RPDIRTY */
MGETL D0.5,D0.6,[D0Ar4] /* Read Catch state */
MOV TXCATCH0,D0.5 /* Restore TXCATCHn */
MOV TXCATCH1,D1.5
MOV TXCATCH2,D0.6
MOV TXCATCH3,D1.6
BZ ___TBIResCrit
MOV D0Ar2,#(1*8)
LSRS D1Ar3,D1Ar3,#TXDIVTIME_RPMASK_S+1 /* 2nd RPMASK bit -> bit 0 */
ADD RA,D0Ar4,#(0*8) /* Re-read read pipeline */
ADDNZ RA,D0Ar4,D0Ar2 /* If Bit 0 set issue RA */
LSRS D1Ar3,D1Ar3,#2 /* Bit 1 -> C, Bit 2 -> Bit 0 */
ADD D0Ar2,D0Ar2,#8
ADDCS RA,D0Ar4,D0Ar2 /* If C issue RA */
ADD D0Ar2,D0Ar2,#8
ADDNZ RA,D0Ar4,D0Ar2 /* If Bit 0 set issue RA */
LSRS D1Ar3,D1Ar3,#2 /* Bit 1 -> C, Bit 2 -> Bit 0 */
ADD D0Ar2,D0Ar2,#8
ADDCS RA,D0Ar4,D0Ar2 /* If C issue RA */
ADD D0Ar2,D0Ar2,#8
ADDNZ RA,D0Ar4,D0Ar2 /* If Bit 0 set issue RA */
MOV TXDIVTIME,A1.3 /* Set RPDIRTY again */
___TBIResCrit:
LSLS D1Ar5,D0Re0,#1 /* Test XCBF (MI) & PRIV (CS)? */
#ifdef TBI_1_4
ANDT D1Ar5,D1Ar5,#(TBICTX_FPAC_BIT*2)
LSL D0Ar6,D1Ar5,#3 /* Convert FPAC into FPACTIVE */
#endif
ANDMT D0Re0,D0Re0,#TBICTX_CBUF_BIT /* Keep CBUF bit from SaveMask */
#ifdef TBI_1_4
OR D0Re0,D0Re0,D0Ar6 /* Combine FPACTIVE with others */
#endif
MGETL D0Ar6,D0Ar4,D0Ar2,D0FrT,D0.5,D0.6,D0.7,[A0StP] /* Restore DX */
MOV TXRPT,A0.2 /* Restore CT regs */
MOV TXBPOBITS,A1.2
MOV TXMODE,A0.3
BCC ___TBIBoingPCX /* Do non-PRIV wait! */
MOV A1GblIGbP,A1GbP /* Save A1GbP too */
MGETL A0StP,A0FrP,A0.2,A0.3 A0_4,[D1Re0] /* Restore AX regs */
/*
* Wait for the first interrupt/exception trigger in a privilege mode system
* (interrupt stack area for current TASK to be pointed to by A0GblIStP
* or per_cpu__stack_save[hwthread_id]).
*/
MOV TXSTATUS,D0Re0 /* Restore flags */
MOV D0Re0,TXPRIVEXT /* Set TXPRIVEXT_TXTOGGLEI_BIT */
SUB D1Re0,D1Re0,#TBICTX_BYTES /* TBICTX is top of int stack */
#ifdef TBX_PERCPU_SP_SAVE
SWAP D1Ar3,A1GbP
MOV D1Ar3,TXENABLE /* Which thread are we? */
AND D1Ar3,D1Ar3,#TXENABLE_THREAD_BITS
LSR D1Ar3,D1Ar3,#TXENABLE_THREAD_S-2
ADDT D1Ar3,D1Ar3,#HI(_per_cpu__stack_save)
ADD D1Ar3,D1Ar3,#LO(_per_cpu__stack_save)
SETD [D1Ar3],D1Re0
SWAP D1Ar3,A1GbP
#else
MOV A0GblIStP, D1Re0
#endif
OR D0Re0,D0Re0,#TXPRIVEXT_TXTOGGLEI_BIT
MOV TXPRIVEXT,D0Re0 /* Cannot set TXPRIVEXT if !priv */
GETL D0Re0,D1Re0,[D1Re0+#TBICTX_DX]
RTI /* Wait for interrupt */
/*
* Save initial interrupt state on A0GblIStP, switch to A0GblIStP if
* BOOTROM code, save and switch to [A1GbP] otherwise.
*/
___TBIBoingPCXP:
#ifdef TBX_PERCPU_SP_SAVE
SWAP D1Ar3,A1GbP /* Get PRIV stack base */
MOV D1Ar3,TXENABLE /* Which thread are we? */
AND D1Ar3,D1Ar3,#TXENABLE_THREAD_BITS
LSR D1Ar3,D1Ar3,#TXENABLE_THREAD_S-2
ADDT D1Ar3,D1Ar3,#HI(_per_cpu__stack_save)
ADD D1Ar3,D1Ar3,#LO(_per_cpu__stack_save)
GETD D1Ar3,[D1Ar3]
#else
SWAP D1Ar3,A0GblIStP /* Get PRIV stack base */
#endif
SETL [D1Ar3+#TBICTX_DX],D0Re0,D1Re0 /* Save key registers */
MOV D0Re0,TXPRIVEXT /* Clear TXPRIVEXT_TXTOGGLEI_BIT */
ADD D1Re0,D1Ar3,#TBICTX_AX /* Address AX save area */
ANDMB D0Re0,D0Re0,#0xFFFF-TXPRIVEXT_TXTOGGLEI_BIT
MOV TXPRIVEXT,D0Re0 /* Cannot set TXPRIVEXT if !priv */
MOV D0Re0,TXSTATUS /* Read TXSTATUS into D0Re0 */
MOV TXSTATUS,#0 /* Clear TXSTATUS */
MSETL [D1Re0],A0StP,A0FrP,A0.2,A0.3 A0_4 /* Save AX critical regs */
MOV A0StP,D1Ar3 /* Switch stacks */
#ifdef TBX_PERCPU_SP_SAVE
MOV D1Ar3,A1GbP /* Get D1Ar2 back */
#else
MOV D1Ar3,A0GblIStP /* Get D1Ar2 back */
#endif
ORT D0Re0,D0Re0,#TBICTX_PRIV_BIT /* Add PRIV to TXSTATUS */
MOV A1GbP,A1GblIGbP /* Restore A1GbP */
B ___TBIBoing /* Enter common handler code */
/*
* At this point we know it's a background HALT case we are handling.
* The restored TXSTATUS always needs to have zero in the reason bits.
*/
___TBIBoingHalt:
MOV D0Ar4,TXMASKI /* Get interrupt mask */
ANDST D0Re0,D0Re0,#HI(TXSTATUS_MAJOR_HALT_BITS+TXSTATUS_MEM_FAULT_BITS)
AND TXMASKI,D0Ar4,#TXSTATI_BGNDHALT_BIT /* Only allow HALTs */
AND D0Ar4,D0Ar4,#0xFFFF-TXSTATI_BGNDHALT_BIT /* What ints are off? */
OR D0Ar2,D0Ar2,D0Ar4 /* Set TBIRES.Sig.TrigMask */
MOV D0Ar4,#TXSTATI_BGNDHALT_BIT /* This was the trigger state */
LSR D1Ar3,D0Re0,#TXSTATUS_MAJOR_HALT_S
MOV D0Re0,#TBID_SIGNUM_XXF<<TBID_SIGNUM_S
BNZ ___TBIBoingVec /* Jump to XXF exception handler */
/*
* Only the SWITCH cases are left, PCX must be valid
*/
#ifdef TBI_1_4
MOV D1Ar5,TXPRIVEXT
TST D1Ar5,#TXPRIVEXT_MINIMON_BIT
LSR D1Ar3,D1Ar1,#1 /* Shift needed for MINIM paths (fill stall) */
BZ $Lmeta /* If META only, skip */
TSTT D1Ar1,#HI(0x00800000)
ANDMT D1Ar3,D1Ar3,#HI(0x007FFFFF >> 1)/* Shifted mask for large MINIM */
ANDT D1Ar1,D1Ar1,#HI(0xFFE00000) /* Static mask for small MINIM */
BZ $Llarge_minim /* If large MINIM */
$Lsmall_minim:
TSTT D1Ar3,#HI(0x00100000 >> 1)
ANDMT D1Ar3,D1Ar3,#HI(0x001FFFFF >> 1)/* Correct shifted mask for large MINIM */
ADDZ D1Ar1,D1Ar1,D1Ar3 /* If META rgn, add twice to undo LSR #1 */
B $Lrecombine
$Llarge_minim:
ANDST D1Ar1,D1Ar1,#HI(0xFF800000) /* Correct static mask for small MINIM */
/* Z=0 (Cannot place code at NULL) */
$Lrecombine:
ADD D1Ar1,D1Ar1,D1Ar3 /* Combine static and shifted parts */
$Lmeta:
GETW D1Ar5,[D1Ar1++] /* META: lo-16, MINIM: lo-16 (all-16 if short) */
GETW D1Ar3,[D1Ar1] /* META: hi-16, MINIM: hi-16 (only if long) */
MOV D1Re0,D1Ar5
XOR D1Re0,D1Re0,#0x4000
LSLSNZ D1Re0,D1Re0,#(32-14) /* MINIM: If long C=0, if short C=1 */
LSLCC D1Ar3,D1Ar3,#16 /* META/MINIM long: Move hi-16 up */
LSLCS D1Ar3,D1Ar5,#16 /* MINIM short: Dup all-16 */
ADD D1Ar5,D1Ar5,D1Ar3 /* ALL: Combine both 16-bit parts */
#else
GETD D1Ar5,[D1Ar1] /* Read instruction for switch */
#endif
LSR D1Ar3,D1Ar5,#22 /* Convert into signal number */
AND D1Ar3,D1Ar3,#TBID_SIGNUM_SW3-TBID_SIGNUM_SW0
LSL D0Re0,D1Ar3,#TBID_SIGNUM_S /* Generate offset from SigNum */
B ___TBIBoingVec /* Jump to switch handler */
/*
* Exit from TBIASyncTrigger call
*/
___TBIBoingExit:
GETL D0FrT,D1RtP,[A0FrP++] /* Restore state from frame */
SUB A0StP,A0FrP,#8 /* Unwind stack */
MOV A0FrP,D0FrT /* Last memory read completes */
MOV PC,D1RtP /* Return to caller */
#endif /* ifdef CODE_USES_BOOTROM */
.size ___TBIResume,.-___TBIResume
#ifndef BOOTROM
/*
* void __TBIASyncResume( TBIRES State )
*/
.text
.balign 4
.global ___TBIASyncResume
.type ___TBIASyncResume,function
___TBIASyncResume:
/*
* Perform CRIT|SOFT state restore and execute background thread.
*/
MOV D1Ar3,D1Ar1 /* Restore this context */
MOV D0Re0,D0Ar2 /* Carry in additional triggers */
/* Reserve space for TBICTX */
ADD D1Ar3,D1Ar3,#TBICTX_BYTES+(CATCH_ENTRY_BYTES*CATCH_ENTRIES)
MOV A0StP,D1Ar3 /* Enter with protection of */
MOV A0FrP,D1Ar1 /* TBICTX on our stack */
#ifdef CODE_USES_BOOTROM
MOVT D1Ar1,#HI(LINCORE_BASE)
JUMP D1Ar1,#0xA4
#else
B ___TBIResume
#endif
.size ___TBIASyncResume,.-___TBIASyncResume
#endif /* ifndef BOOTROM */
/*
* End of tbipcx.S
*/