/* * Miscellaneous low-level MMU functions. * * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2008-2009 PetaLogix * Copyright (C) 2007 Xilinx, Inc.  All rights reserved. * * Derived from arch/ppc/kernel/misc.S * * This file is subject to the terms and conditions of the GNU General * Public License. See the file COPYING in the main directory of this * archive for more details. */ #include <linux/linkage.h>#include <linux/sys.h>#include <asm/unistd.h>#include <linux/errno.h>#include <asm/mmu.h>#include <asm/page.h> 	.text/* * Flush MMU TLB * * We avoid flushing the pinned 0, 1 and possibly 2 entries. */.globl _tlbia;.type  _tlbia, @function.align 4;_tlbia:	addik	r12, r0, MICROBLAZE_TLB_SIZE - 1 /* flush all entries (63 - 3) */	/* isync */_tlbia_1:	mts	rtlbx, r12	nop	mts	rtlbhi, r0 /* flush: ensure V is clear */	nop	addik	r11, r12, -2	bneid	r11, _tlbia_1 /* loop for all entries */	addik	r12, r12, -1	/* sync */	rtsd	r15, 8	nop	.size  _tlbia, . - _tlbia /* * Flush MMU TLB for a particular address (in r5) */.globl _tlbie;.type  _tlbie, @function.align 4;_tlbie:	mts	rtlbsx, r5 /* look up the address in TLB */	nop	mfs	r12, rtlbx /* Retrieve index */	nop	blti	r12, _tlbie_1 /* Check if found */	mts	rtlbhi, r0 /* flush: ensure V is clear */	nop_tlbie_1:	rtsd	r15, 8	nop 	.size  _tlbie, . - _tlbie /* * Allocate TLB entry for early console */.globl early_console_reg_tlb_alloc;.type  early_console_reg_tlb_alloc, @function.align 4;early_console_reg_tlb_alloc:	/*	 * Load a TLB entry for the UART, so that microblaze_progress() can use	 * the UARTs nice and early.  We use a 4k real==virtual mapping.	 */	ori	r4, r0, MICROBLAZE_TLB_SIZE - 1	mts	rtlbx, r4 /* TLB slot 63 */ 	or	r4,r5,r0	andi	r4,r4,0xfffff000	ori	r4,r4,(TLB_WR|TLB_I|TLB_M|TLB_G) 	andi	r5,r5,0xfffff000	ori	r5,r5,(TLB_VALID | TLB_PAGESZ(PAGESZ_4K)) 	mts	rtlblo,r4 /* Load the data portion of the entry */	nop	mts	rtlbhi,r5 /* Load the tag portion of the entry */	nop	rtsd	r15, 8	nop 	.size  early_console_reg_tlb_alloc, . - early_console_reg_tlb_alloc