120 lines
1.6 KiB
ArmAsm
120 lines
1.6 KiB
ArmAsm
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/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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ioaccess.s
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Abstract:
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This module contains routines to read and write to mapped addresses.
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These are workarrounds for the R4000 bugs.
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Author:
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Lluis Abello (lluis) 15-May-91
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Environment:
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ROM Selftest.
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Notes:
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--*/
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#include "ksmips.h"
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.text
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.set noreorder
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.set noat
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#ifdef R4000
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LEAF_ENTRY(NtFlushByteBuffer)
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nop
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nop
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sb a1,0(a0)
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nop
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nop
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j ra
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nop
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.end
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LEAF_ENTRY(NtFlushShortBuffer)
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nop
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nop
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sh a1,0(a0)
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nop
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nop
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j ra
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nop
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.end
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LEAF_ENTRY(NtFlushLongBuffer)
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nop
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nop
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sw a1,0(a0)
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nop
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nop
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j ra
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nop
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.end
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LEAF_ENTRY(NtReadByte)
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lbu v0,0(a0)
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nop
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nop
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j ra
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nop
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.end
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LEAF_ENTRY(NtReadShort)
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lhu v0,0(a0)
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nop
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nop
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j ra
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nop
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.end
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LEAF_ENTRY(NtReadLong)
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lw v0,0(a0)
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nop
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nop
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j ra
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nop
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.end
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#endif
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#ifdef R3000
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SBTTL("Flush Write Buffer")
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//++
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//
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// NTSTATUS
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// NtFlushWriteBuffer (
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// VOID
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// )
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//
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// Routine Description:
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//
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// This function flushes the write buffer on the current processor.
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//
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// Arguments:
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//
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// None.
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//
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// Return Value:
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//
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// STATUS_SUCCESS.
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//
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//--
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LEAF_ENTRY(FlushWriteBuffer)
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.set noreorder
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.set noat
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nop // four nop's are required
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nop //
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nop //
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nop //
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10: //
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bc0f 10b // if false, write buffer not empty
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nop
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j ra // return
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.end FlushWritebuffer
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#endif
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