ginit.s
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/**************************************************************************
* *
* Copyright (C) 1994, Silicon Graphics, Inc. *
* *
* These coded instructions, statements, and computer programs contain *
* unpublished proprietary information of Silicon Graphics, Inc., and *
* are protected by Federal copyright law. They may not be disclosed *
* to third parties or copied or duplicated in any form, in whole or *
* in part, without the prior written consent of Silicon Graphics, Inc. *
* *
*************************************************************************/
/*
* File: ginit.s
* Creator: acorn@sgi.com
* Create Date: 3/14/95
*
* This in the init code for the 'graphics task' which used to be in gmain.s
* but was moved to here so it could be overlayed with clip and light code.
*
*/
############################################################################
#
# Begin task initialization
#
# Register $1 holds the task header address
# format for the task header:
# (see task.h)
#
#
.ent doInit
doInit:
# set RSP yield flags to FALSE (IMPORTANT: don't clear yield flag)
ori $2,zero,(SP_CLR_YIELDED|SP_CLR_TASKDONE)
mtc0 $2, SP_STATUS
#
# important constants:
#
lqv vconst[0], VCONST_OFFSET(zero)
lqv vconst1[0], VCONST1_OFFSET(zero)
#
# The task header should tell us if this is a restart
# of a previously checkpointed run. If so, do some special
# init sequence.
#
.name yield, $4
lw yield, (RSP_TASK_OFFSET+OS_TASK_OFF_FLAGS)(zero)
andi yield, yield, OS_TASK_YIELDED
bne yield, zero, RSPYieldRestart
#if 1
/* Bug fix Jan17,97 F3DEX-1.21
* Yield 処理後に LoadUcode を処理すると, Yield flag が
* 立ったままのため, 再度 yield 処理を行なってしまう.
* このため一度 yield 処理したらこのフラグを寝させる必要がある.
* OS_TASK_OFF_FLAGS はここの他には rspboot.s 内でのみでしか
* 参照してるいないので 0 に上書きしても現状では大丈夫
*/
sw zero, (RSP_TASK_OFFSET+OS_TASK_OFF_FLAGS)(zero)
#else
nop
#endif
.unname yield
#ifdef OUTPUT_DRAM
# reset output pointers
lw outp, OS_TASK_OFF_OUTBUFF($1)
lw $3, OS_TASK_OFF_OUTBUFF_SZ($1)
sw outp, RSP_STATE_DRAM_OUTP(rsp_state)
sw $3, RSP_STATE_DRAM_OUT_LENP(rsp_state)
addi $4, zero, DPC_CLR_XBUS_DMEM_DMA
mtc0 $4, CMD_STATUS
addi outp, zero, RSP_OUTPUT_OFFSET
#else
#ifdef OUTPUT_FIFO
.name bufend, $3
# reset output pointers
lw outp, OS_TASK_OFF_OUTBUFF($1)
lw bufend, OS_TASK_OFF_OUTBUFF_SZ($1)
sw outp, RSP_STATE_FIFO_BUF_TOP(rsp_state)
sw bufend, RSP_STATE_FIFO_BUF_END(rsp_state)
mfc0 $4, CMD_STATUS
andi $4, $4, DPC_STATUS_XBUS_DMEM_DMA
bne $4, zero, restart_fifo
mfc0 $4, CMD_END
sub outp, outp, $4
bgtz outp, restart_fifo
mfc0 $5, CMD_CURRENT
beq $5, zero, restart_fifo
nop
beq $5, $4, restart_fifo
nop
j set_fifo
ori bufend, $4, 0
restart_fifo:
mfc0 $4, CMD_STATUS
andi $4, $4, DPC_STATUS_START_VALID
bne $4, zero, restart_fifo
addi $4, zero, DPC_CLR_XBUS_DMEM_DMA
### LOOP TO restart_fifo: UNTIL START_VALID=0
mtc0 $4, CMD_STATUS
mtc0 bufend, CMD_START
mtc0 bufend, CMD_END
set_fifo:
sw bufend, RSP_STATE_FIFO_OUTP(rsp_state)
addi outp, zero, RSP_OUTPUT_OFFSET
.unname bufend
#else /* OUTPUT_XBUS: */
# reset output pointers
lw outp, OS_TASK_OFF_OUTBUFF($1)
lw $3, OS_TASK_OFF_OUTBUFF_SZ($1)
sw $0, RSP_STATE_DRAM_OUTP(rsp_state)
sw $3, RSP_STATE_DRAM_OUT_LENP(rsp_state)
addi $4, zero, DPC_SET_XBUS_DMEM_DMA
addi outp, zero, 0x1000 # DP initial conditions
mtc0 $4, CMD_STATUS
mtc0 outp, CMD_START
mtc0 outp, CMD_END
#endif /* OUTPUT_XBUS */
#endif /* OUTPUT_XBUS */
#####################################################################
#
# code overlays:
#
# update table to be real DRAM address:
# (awkward, we pipeline the load delays)
NoRestart:
lw $5, OS_TASK_OFF_UCODE($1) # ucode base pointer
#ifdef FASTLIGHT3D
# PATCH NEWTON, CLIP, AND LIGHTING
lw $2, (OVERLAY_1_OFFSET + OVERLAY_OFFSET)(zero)
lw $3, (OVERLAY_2_OFFSET + OVERLAY_OFFSET)(zero)
lw $4, (OVERLAY_3_OFFSET + OVERLAY_OFFSET)(zero)
lw $6, (OVERLAY_4_OFFSET + OVERLAY_OFFSET)(zero)
add $2, $2, $5
add $3, $3, $5
add $4, $4, $5
add $6, $6, $5
sw $2, (OVERLAY_1_OFFSET + OVERLAY_OFFSET)(zero)
sw $3, (OVERLAY_2_OFFSET + OVERLAY_OFFSET)(zero)
sw $4, (OVERLAY_3_OFFSET + OVERLAY_OFFSET)(zero)
sw $6, (OVERLAY_4_OFFSET + OVERLAY_OFFSET)(zero)
#else /* FASTLIGHT3D */
# PATCH NEWTON ONLY
lw $2, (OVERLAY_1_OFFSET + OVERLAY_OFFSET)(zero)
add $2, $2, $5
sw $2, (OVERLAY_1_OFFSET + OVERLAY_OFFSET)(zero)
#endif /* FASTLIGHT3D */
# load newton code:
jal loadOverlaySR
addi $30, zero, OVERLAY_NEWTON
#ifndef FASTLIGHT3D
.symbol NewtonDiv, 0x04001000 # for call-forward
.symbol Newtons, 0x04001020 # for call-forward
#endif /* FASTLIGHT3D */
#
#
#####################################################################
#
# get the first display list out of the header and
# start the DMA of the display list into DMEM.
jal LoadDL
lw inp, OS_TASK_OFF_DATA($1)
#
# while DMA is going on, do some initializations:
#
# MOST initialization is done at compile time, and loaded
# in during the PData DMA.
#
# initialize DRAM stack pointer in RSP state
#-YASU
#
# Matrix スタックの設定
# サイズの指定を無視していたのを直す
#
#-YASU
.name dram_ptr, $2
.name dram_sz, $3
lw dram_ptr, OS_TASK_OFF_STACK($1)
#ifdef MTXNOLMT
lw dram_sz, OS_TASK_OFF_STACK_SZ($1)
#endif
sw dram_ptr, RSP_STATE_DRAM_STACK(rsp_state)
# initialize matrix stacks to empty
sw dram_ptr, RSP_STATE_MMTX_STACK_P(rsp_state)
#ifdef MTXNOLMT
add dram_ptr, dram_ptr, dram_sz
#else
addi dram_ptr, dram_ptr, (10*64)
#endif
sw dram_ptr, RSP_STATE_MMTX_STACK_MAX(rsp_state)
# save RSP_STATE_YIELD_STORE address from task header
lw dram_ptr, -8(zero)
sw dram_ptr, RSP_STATEP_YIELD_STORE(zero)
.unname dram_ptr
.unname dram_sz
#
#
#
# end of initialization section
#
############################################################################
.end doInit