72 lines
1.1 KiB
ArmAsm
72 lines
1.1 KiB
ArmAsm
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#include <asm.h>
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#
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# r3 chan
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# r4 FileName
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# r5 FileInfo
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CARDOpen:
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mflr %r0
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stw %r0, 4(%sp)
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stwu %sp, -0x10(%sp)
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cmpwi %r3, 0
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bne NoCard
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#send cmd to DM
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li %r0, 0
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lis %r7, 0xC000
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addi %r7, %r7, 0x2F60
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#IPC area
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dcbi %r0, %r7
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addi %r7, %r7, 0x20
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dcbi %r0, %r7
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lis %r7, 0xC000
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#cmd is the same as the offset, one opcode saved!
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stw %r7, 0x2F60(%r7)
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stw %r4, 0x2F64(%r7)
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stw %r5, 0x2F68(%r7)
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#cache workaround for the filename
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li %r3, 8
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mtctr %r3
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lis %r3, 0xC000
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invalidloop:
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lwz %r0, 0(%r4)
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stw %r0, 0x17E0(%r3)
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addi %r4, %r4, 4
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addi %r3, %r3, 4
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bdnz invalidloop
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li %r0, 3
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stw %r0, 0x2F78(%r7)
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ready_loop:
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lwz %r0, 0x2F78(%r7)
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cmpwi %r0, 3
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beq ready_loop
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wait_loop:
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lwz %r0, 0x2F9C(%r7)
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andi. %r0, %r0, 0x14
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cmpwi %r0, 0
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beq wait_loop
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lwz %r0, 0x2F90(%r7)
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stw %r0, 0x04(%r5)
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lwz %r3, 0x2F94(%r7)
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b end
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NoCard:
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li %r3, -3
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end:
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mr %r4, %r3
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lwz %r0, 0x14(%sp)
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addi %sp, %sp, 0x10
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mtlr %r0
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blr
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