Pre-IPL ROM Stage disassembled code
Dumped from Motherboard: TA-081
ROM:BFC00000 # =============== S U B R O U T I N E =======================================
ROM:BFC00000
ROM:BFC00000
ROM:BFC00000 __start: # CODE XREF: ROM:BFC00200j
ROM:BFC00000 ctc0 $v0, $4
ROM:BFC00004 lw $v0, 0xBC100000 # check Number of NMI that occured
ROM:BFC00004 # from System Config Register
ROM:BFC0000C bnez $v0, loc_BFC00064
ROM:BFC00010 nop
ROM:BFC00014 ctc0 $zero, $9
ROM:BFC00018 jal pspClearDcache
ROM:BFC0001C nop
ROM:BFC00020 jal pspClearIcache
ROM:BFC00024 nop
ROM:BFC00028 lui $a0, 0xA001
ROM:BFC0002C la $a1, RAM_PAYLOAD
ROM:BFC00034 li $a2, 0xAF8
ROM:BFC00038
ROM:BFC00038 loc_BFC00038: # CODE XREF: __start+48j
ROM:BFC00038 lw $t0, 0($a1) # this loop copy code
ROM:BFC00038 # from[0xbfc00280]
ROM:BFC00038 # to[0xa0010000]size[0xAF8]
ROM:BFC0003C addiu $a1, 4
ROM:BFC00040 sw $t0, 0($a0)
ROM:BFC00044 addiu $a2, -4
ROM:BFC00048 bgtz $a2, loc_BFC00038
ROM:BFC0004C addiu $a0, 4
ROM:BFC00050 li $sp, 0x80013FF0 # setup temp stack point
ROM:BFC00058 lui $t9, 0x8001
ROM:BFC0005C jr $t9 # jump to RAM c entry[0x80010000]
ROM:BFC00060 sync
ROM:BFC00064 # ---------------------------------------------------------------------------
ROM:BFC00064
ROM:BFC00064 loc_BFC00064: # CODE XREF: __start+Cj
ROM:BFC00064 cfc0 $v0, $9
ROM:BFC00068 beqz $v0, loc_BFC00078
ROM:BFC0006C nop
ROM:BFC00070 jr $v0
ROM:BFC00074 nop
ROM:BFC00078 # ---------------------------------------------------------------------------
ROM:BFC00078
ROM:BFC00078 loc_BFC00078: # CODE XREF: __start+68j
ROM:BFC00078 cfc0 $v0, $4
ROM:BFC0007C mfc0 $k1, SR # Clear status reg bit22
ROM:BFC0007C # "Bootstrap Exception Vector"
ROM:BFC00080 li $k0, 0xFFBFFFFF
ROM:BFC00088 and $k1, $k0
ROM:BFC0008C mtc0 $k1, SR
ROM:BFC00090 mfc0 $k0, $25 # Return ISR
ROM:BFC00094 jr $k0
ROM:BFC00098 nop
ROM:BFC00098 # End of function __start
ROM:BFC00098
ROM:BFC00098 # ---------------------------------------------------------------------------
ROM:BFC0009C Filling: .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC0009C .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
ROM:BFC00200 # ---------------------------------------------------------------------------
ROM:BFC00200 b __start # General exception Vector Address when BEV==1
ROM:BFC00200 # ---------------------------------------------------------------------------
ROM:BFC00204 .word 0
ROM:BFC00208
ROM:BFC00208 # =============== S U B R O U T I N E =======================================
ROM:BFC00208
ROM:BFC00208
ROM:BFC00208 pspClearIcache: # CODE XREF: __start+20p
ROM:BFC00208 mfc0 $t0, Config # Configuration register
ROM:BFC0020C li $t1, 0x1000 # cache size is given by 2^(12+IC)
ROM:BFC0020C # 0x1000 = 2^12
ROM:BFC00210 ext $t0, 9, 3
ROM:BFC00214 sllv $t1, $t0 # calc cache size
ROM:BFC00218 mtc0 $zero, TagLo # Cache Tag register
ROM:BFC0021C mtc0 $zero, TagHi # Cache Tag register
ROM:BFC00220 move $t0, $zero
ROM:BFC00224
ROM:BFC00224 loc_BFC00224: # CODE XREF: pspClearIcache+28j
ROM:BFC00224 cache 1, 0($t0) # Index Invalidate (primary data cache)
ROM:BFC00228 cache 3, 0($t0) # Index Invalidate (secondary data cache)
ROM:BFC0022C addiu $t0, 0x40
ROM:BFC00230 bne $t0, $t1, loc_BFC00224
ROM:BFC00234 nop
ROM:BFC00238 jr $ra
ROM:BFC0023C nop
ROM:BFC0023C # End of function pspClearIcache
ROM:BFC0023C
ROM:BFC00240
ROM:BFC00240 # =============== S U B R O U T I N E =======================================
ROM:BFC00240
ROM:BFC00240
ROM:BFC00240 pspClearDcache: # CODE XREF: __start+18p
ROM:BFC00240 mfc0 $t0, Config # Configuration register
ROM:BFC00244 li $t1, 0x1000
ROM:BFC00248 ext $t0, 6, 3
ROM:BFC0024C sllv $t1, $t0
ROM:BFC00250 mtc0 $zero, TagLo # Cache Tag register
ROM:BFC00254 mtc0 $zero, TagHi # Cache Tag register
ROM:BFC00258 move $t0, $zero
ROM:BFC0025C
ROM:BFC0025C loc_BFC0025C: # CODE XREF: pspClearDcache+28j
ROM:BFC0025C cache 0x11, 0($t0) # Hit Invalidate (primary data cache)
ROM:BFC00260 cache 0x13, 0($t0) # Hit Invalidate (secondary data cache)
ROM:BFC00264 addiu $t0, 0x40
ROM:BFC00268 bne $t0, $t1, loc_BFC0025C
ROM:BFC0026C nop
ROM:BFC00270 jr $ra
ROM:BFC00270 # End of function pspClearDcache
ROM:BFC00270
ROM:BFC00270 # ---------------------------------------------------------------------------
ROM:BFC00274 .word 0
ROM:BFC00278 .word 0
ROM:BFC0027C .word 0
ROM:BFC00280 RAM_PAYLOAD: .word 0x3C048001, 0x24840A80, 0xC0041AC, 0, 0x3C08BC10 # DATA XREF: __start+2Co
ROM:BFC00280 .word 0x8D090068, 0x94C02, 0x11200005, 0, 0x8D090078, 0x35290800
… …
ROM:BFC00FB0 aCopyrightC2004:.ascii "Copyright (C) 2004 Sony Computer Entertainment Inc. All right"
ROM:BFC00FB0 .ascii "s reserved."<0>
ROM:BFC00FF9 .byte 0
ROM:BFC00FFA .byte 0
ROM:BFC00FFB .byte 0
ROM:BFC00FFC .word 0x20040420
ROM:BFC00FFC
ROM:BFC00FFC # end
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