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115 lines
2.2 KiB
115 lines
2.2 KiB
#if defined(R4000)
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// TITLE("AllocateFree TB Entry")
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//++
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//
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// Copyright (c) 1992 Microsoft Corporation
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//
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// Module Name:
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//
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// x4tb.s
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//
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// Abstract:
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//
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// This module implements allocates and frees fixed TB entries using the
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// wired register.
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//
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// Author:
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//
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// David N. Cutler (davec) 29-Dec-1992
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//
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// Environment:
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//
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// Kernel mode only.
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//
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// Revision History:
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//
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//--
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#include "halmips.h"
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SBTTL("Allocate Tb Entry")
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//++
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//
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// ULONG
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// HalpAllocateTbEntry (
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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 allocates the TB entry specified by the wired register
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// and increments the wired register.
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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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// The index of the allocated TB entry.
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//
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//--
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LEAF_ENTRY(HalpAllocateTbEntry)
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DISABLE_INTERRUPTS(t0) // disable interrupts
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.set noreorder
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.set noat
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mfc0 v0,wired // get contents of wired register
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nop // fill
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addu v1,v0,1 // allocate TB entry
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mtc0 v1,wired //
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.set at
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.set reorder
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ENABLE_INTERRUPTS(t0) // enable interrupts
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j ra // return
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.end HalpAllocateTbEntry
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SBTTL("Free Tb Entry")
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//++
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//
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// VOID
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// HalpAllocateTbEntry (
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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 frees the TB entry specified by the wired register
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// and decrements the wired register.
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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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// None.
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//
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//--
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LEAF_ENTRY(HalpFreeTbEntry)
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DISABLE_INTERRUPTS(t0) // disable interrupts
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.set noreorder
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.set noat
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mfc0 v0,wired // get contents of wired register
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nop // fill
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subu v1,v0,1 // free TB entry
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mtc0 v1,wired //
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.set at
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.set reorder
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ENABLE_INTERRUPTS(t0) // enable interrupts
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j ra // return
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.end HalpFreeTbEntry
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#endif
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