View source for Cd read retry

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 00020a64: 27bdffd8 addiu r29,r29,0xffd8
 00020a68: afb1001c sw r17,0x001c(r29)
 00020a6c: 00808821 addu r17,r4,r0
 00020a70: 00002021 addu r4,r0,r0
 00020a74: afbf0020 sw r31,0x0020(r29)
 00020a78: 0c007ad6 jal 0x0001eb58                [[CdSyncCallback]]
 00020a7c: afb00018 sw r16,0x0018(r29)
 00020a80: 0c007adc jal 0x0001eb70                [[CdReadyCallback]]
 00020a84: 00002021 addu r4,r0,r0
 00020a88: 0c007a73 jal 0x0001e9cc                [[CdStatus]]
 00020a8c: 00000000 nop
 00020a90: 30420010 andi r2,r2,0x0010
 00020a94: 10400017 beq r2,r0,0x00020af4          branch if shell closed
 00020a98: 00000000 nop
 00020a9c: 0c0076ea jal 0x0001dba8                [[VSync]]
 00020aa0: 2404ffff addiu r4,r0,0xffff
 00020aa4: 3042003f andi r2,r2,0x003f
 00020aa8: 14400006 bne r2,r0,0x00020ac4          branch if, vsync is a multiple of 40?
 00020aac: 34040001 ori r4,r0,0x0001
 00020ab0: 3c048001 lui r4,0x8001
 00020ab4: 24840438 addiu r4,r4,0x0438
 00020ab8: 0c0088a3 jal 0x0002228c                [[Write String to Terminal]] "CdRead: Shell open...\n"
 00020abc: 00000000 nop
 00020ac0: 34040001 ori r4,r0,0x0001              issue NOP to CDrom
 00020ac4: 0c007b30 jal 0x0001ecc0                [[CdControlF]] NOP
 00020ac8: 00002821 addu r5,r0,r0
 00020acc: 0c0076ea jal 0x0001dba8                [[VSync]]
 00020ad0: 2404ffff addiu r4,r0,0xffff
 00020ad4: 3c038003 lui r3,0x8003
 00020ad8: 24631ba8 addiu r3,r3,0x1ba8            absolute time after program boot
 00020adc: ac620000 sw r2,0x0000(r3)
 00020ae0: 2402ffff addiu r2,r0,0xffff
 00020ae4: 3c018003 lui r1,0x8003
 00020ae8: ac221ba0 sw r2,0x1ba0(r1)              command failed?
 00020aec: 08008307 j 0x00020c1c                  end
 00020af0: 00000000 nop
closed shell
 00020af4: 12200017 beq r17,r0,0x00020b54         if input 0, skip
 00020af8: 00000000 nop
 00020afc: 3c048001 lui r4,0x8001
 00020b00: 24840450 addiu r4,r4,0x0450
 00020b04: 0c0088a3 jal 0x0002228c                [[Write String to Terminal]] "CdRead: retry...\n"
 00020b08: 00000000 nop
 00020b0c: 34040009 ori r4,r0,0x0009              pause CD
 00020b10: 00002821 addu r5,r0,r0
 00020b14: 0c007ae2 jal 0x0001eb88                [[CdControl]]
 00020b18: 00003021 addu r6,r0,r0
 00020b1c: 0c007a7f jal 0x0001e9fc                [[CdLastPos]]
 00020b20: 00000000 nop
 00020b24: 34040002 ori r4,r0,0x0002              set seek target position
 00020b28: 00402821 addu r5,r2,r0                 pointer to last CDpos CDlLoc
 00020b2c: 0c007ae2 jal 0x0001eb88                [[CdControl]]
 00020b30: 00003021 addu r6,r0,r0
 00020b34: 14400007 bne r2,r0,0x00020b54          branch if command issued successfully
 00020b38: 2403ffff addiu r3,r0,0xffff
 00020b3c: 3c028003 lui r2,0x8003
 00020b40: 24421ba0 addiu r2,r2,0x1ba0            command failed?
 00020b44: ac430000 sw r3,0x0000(r2)              
 00020b48: 8c420000 lw r2,0x0000(r2)
 00020b4c: 08008309 j 0x00020c24                  return -1
 00020b50: 00000000 nop
p1 = 0:
 00020b54: 0c007a9e jal 0x0001ea78                [[CdFlush]]
 00020b58: 00000000 nop
 00020b5c: 3c028003 lui r2,0x8003
 00020b60: 24421b98 addiu r2,r2,0x1b98
 00020b64: 8c500000 lw r16,0x0000(r2)             CDRom subsystem mode
 00020b68: 00000000 nop
 00020b6c: a3b00010 sb r16,0x0010(r29)            
 00020b70: 0c007a77 jal 0x0001e9dc                [[CdMode]]
 00020b74: 321000ff andi r16,r16,0x00ff
 00020b78: 16020003 bne r16,r2,0x00020b88         branch if they don't match
 00020b7c: 3404000e ori r4,r0,0x000e              set mode
 00020b80: 1220000a beq r17,r0,0x00020bac         branch if 0
 00020b84: 00000000 nop
 00020b88: 27a50010 addiu r5,r29,0x0010
 00020b8c: 0c007ae2 jal 0x0001eb88                [[CdControl]] manually reset CD mode to intended value?
 00020b90: 00003021 addu r6,r0,r0
 00020b94: 14400005 bne r2,r0,0x00020bac          branch if successful
 00020b98: 2402ffff addiu r2,r0,0xffff
 00020b9c: 3c018003 lui r1,0x8003
 00020ba0: ac221ba0 sw r2,0x1ba0(r1)              unsuccessful
 00020ba4: 08008307 j 0x00020c1c                  end
 00020ba8: 00000000 nop

 00020bac: 0c007a7f jal 0x0001e9fc                [[CdLastPos]]
 00020bb0: 00000000 nop
 00020bb4: 0c007c30 jal 0x0001f0c0                [[CdPosToInt]]
 00020bb8: 00402021 addu r4,r2,r0
 00020bbc: 3c048002 lui r4,0x8002
 00020bc0: 24840840 addiu r4,r4,0x0840            cb_read
 00020bc4: 3c038003 lui r3,0x8003
 00020bc8: 24631bac addiu r3,r3,0x1bac
 00020bcc: ac620000 sw r2,0x0000(r3)              store LBA of last attempt at reading file
 00020bd0: 0c007adc jal 0x0001eb70                [[CdReadyCallback]] initiate with [[cb_read]] on CD load
 00020bd4: 00000000 nop
 00020bd8: 34040006 ori r4,r0,0x0006              start data read
 00020bdc: 3c028003 lui r2,0x8003
 00020be0: 8c421b90 lw r2,0x1b90(r2)              load buffer address
 00020be4: 00002821 addu r5,r0,r0
 00020be8: 3c018003 lui r1,0x8003
 00020bec: ac221b94 sw r2,0x1b94(r1)              store buffer address
 00020bf0: 0c007b30 jal 0x0001ecc0                [[CdControlF]]
 00020bf4: 00000000 nop
 00020bf8: 3c028003 lui r2,0x8003
 00020bfc: 8c421b8c lw r2,0x1b8c(r2)              load sector count
 00020c00: 2404ffff addiu r4,r0,0xffff
 00020c04: 3c018003 lui r1,0x8003
 00020c08: ac221ba0 sw r2,0x1ba0(r1)              store sector count at cdread failstate?
 00020c0c: 0c0076ea jal 0x0001dba8                [[VSync]]
 00020c10: 00000000 nop
 00020c14: 3c018003 lui r1,0x8003
 00020c18: ac221ba4 sw r2,0x1ba4(r1)              store total vsync count since opening 
End
 00020c1c: 3c028003 lui r2,0x8003
 00020c20: 8c421ba0 lw r2,0x1ba0(r2)
 00020c24: 8fbf0020 lw r31,0x0020(r29)
 00020c28: 8fb1001c lw r17,0x001c(r29)
 00020c2c: 8fb00018 lw r16,0x0018(r29)
 00020c30: 27bd0028 addiu r29,r29,0x0028
 00020c34: 03e00008 jr r31
 00020c38: 00000000 nop
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