/* * 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: lwi r12, r0, tlb_skip; /* isync */ _tlbia_1: mts rtlbx, r12 nop mts rtlbhi, r0 /* flush: ensure V is clear */ nop rsubi r11, r12, MICROBLAZE_TLB_SIZE - 1 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. */ lwi r4, r0, tlb_skip 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 lwi r5, r0, tlb_skip addik r5, r5, 1 swi r5, r0, tlb_skip rtsd r15, 8 nop .size early_console_reg_tlb_alloc, . - early_console_reg_tlb_alloc |