75 lines
1.0 KiB
ArmAsm
75 lines
1.0 KiB
ArmAsm
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#include <asm.h>
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#
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# r3 chan
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# r4 FileNo
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# r5 Stat
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# r6 cb
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CARDGetStats:
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cmpwi %r3, 0
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beq DoCode
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li %r3, 0
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li %r4, -3
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blr
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DoCode:
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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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#send cmd to DM
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mr %r12, %r6
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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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lis %r0, 0xC300
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stw %r0, 0x2F60(%r7)
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stw %r4, 0x2F64(%r7)
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stw %r5, 0x2F68(%r7)
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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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#cache workaround
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li %r6, 27
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mtctr %r6
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lis %r6, 0xC000
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addi %r6, %r6, 0x1780
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invalidloop:
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lwz %r0, 0(%r6)
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stw %r0, 0(%r5)
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addi %r5, %r5, 4
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addi %r6, %r6, 4
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bdnz invalidloop
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lwz %r3, 0x2F94(%r7)
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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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