callout_page_720.s

QNX ADS BSP code for i.MX27 chips

#
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 # Copyright 2007, QNX Software Systems.  
 # 
 # Licensed under the Apache License, Version 2.0 (the "License"). You  
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/*
 * ARM720T specific page flush callouts
 */

#include "callout.ah"

/*
 * int	page_flush(unsigned vaddr, int cache)
 *
 * This routine is called to flush the caches and TLBs for a single page.
 * vaddr. If the processor cannot flush cache lines or TLB entries by address,
 * those caches and TLBs can be flushed in page_flush_deferred()
 *
 * vaddr is the virtual address of the page
 * cache is non-zero if the cache needs to be flushed
 *
 * Returns 0 if all caches/TLBs were flushed.
 *         1 if the page_flush_deferred() callout needs to be called.
 */
CALLOUT_START(page_flush_720, 0, 0)
	mcr		p15, 0, r0, c8, c7, 1				// flush TLB
	teq		r1, #0
	movne	r0, #1								// flush cache later
	moveq	r0, #0
	mov		pc, lr
CALLOUT_END(page_flush_720)

/*
 * void	page_flush_deferred(int cache)
 *
 * This routine performs any cache/TLB flushing that could not be done in
 * the page_flush() callout.
 *
 * cache is non-zero if the cache needs to be flushed
 */
CALLOUT_START(page_flush_deferred_720, 0, 0)
	teq		r0, #0
	mcrne	p15, 0, r0, c7, c7, 1				// flush IDC
	mov		pc, lr
CALLOUT_END(page_flush_deferred_720)