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Diffstat (limited to 'arch/microblaze/kernel/misc.S')
| -rw-r--r-- | arch/microblaze/kernel/misc.S | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/misc.S b/arch/microblaze/kernel/misc.S new file mode 100644 index 000000000..1228a09d8 --- /dev/null +++ b/arch/microblaze/kernel/misc.S @@ -0,0 +1,66 @@ +/* + * 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 + mbar 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 + mbar 1 /* sync */ +_tlbie_1: + rtsd r15, 8 + nop + + .size _tlbie, . - _tlbie |