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#if defined(R4000)
//#pragma comment(exestr, "$Header: /usr4/winnt/SOURCES/ddk35/src/hal/halsni/mips/RCS/x4tb.s,v 1.2 1994/12/01 15:18:29 holli Exp $")
// TITLE("AllocateFree TB Entry")
//++
//
// Copyright (c) 1992-1993 Microsoft Corporation
//
// Module Name:
//
// x4tb.s
//
// Abstract:
//
// This module implements allocates and frees fixed TB entries using the
// wired register.
//
// Environment:
//
// Kernel mode only.
//
//--
#include "halmips.h"
SBTTL("Allocate Tb Entry")
//++
//
// ULONG
// HalpAllocateTbEntry (
// VOID
// )
//
// Routine Description:
//
// This function allocates the TB entry specified by the wired register
// and increments the wired register.
//
// Arguments:
//
// None.
//
// Return Value:
//
// The index of the allocated TB entry.
//
//--
LEAF_ENTRY(HalpAllocateTbEntry)
DISABLE_INTERRUPTS(t0) // disable interrupts
.set noreorder
.set noat
mfc0 v0,wired // get contents of wired register
nop // fill
addu v1,v0,1 // allocate TB entry
mtc0 v1,wired //
.set at
.set reorder
ENABLE_INTERRUPTS(t0) // enable interrupts
j ra // return
.end HalpAllocateTbEntry
SBTTL("Free Tb Entry")
//++
//
// VOID
// HalpFreeTbEntry (
// VOID
// )
//
// Routine Description:
//
// This function frees the TB entry specified by the wired register
// and decrements the wired register.
//
// Arguments:
//
// None.
//
// Return Value:
//
// None.
//
//--
LEAF_ENTRY(HalpFreeTbEntry)
DISABLE_INTERRUPTS(t0) // disable interrupts
.set noreorder
.set noat
mfc0 v0,wired // get contents of wired register
nop // fill
subu v1,v0,1 // free TB entry
mtc0 v1,wired //
.set at
.set reorder
ENABLE_INTERRUPTS(t0) // enable interrupts
j ra // return
.end HalpFreeTbEntry
#endif
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