| 1 | /* |
|---|
| 2 | * Miscellaneous low-level MMU functions. |
|---|
| 3 | * |
|---|
| 4 | * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> |
|---|
| 5 | * Copyright (C) 2008-2009 PetaLogix |
|---|
| 6 | * Copyright (C) 2007 Xilinx, Inc. All rights reserved. |
|---|
| 7 | * |
|---|
| 8 | * Derived from arch/ppc/kernel/misc.S |
|---|
| 9 | * |
|---|
| 10 | * This file is subject to the terms and conditions of the GNU General |
|---|
| 11 | * Public License. See the file COPYING in the main directory of this |
|---|
| 12 | * archive for more details. |
|---|
| 13 | */ |
|---|
| 14 | |
|---|
| 15 | #include <linux/linkage.h> |
|---|
| 16 | #include <linux/sys.h> |
|---|
| 17 | #include <asm/unistd.h> |
|---|
| 18 | #include <linux/errno.h> |
|---|
| 19 | #include <asm/mmu.h> |
|---|
| 20 | #include <asm/page.h> |
|---|
| 21 | |
|---|
| 22 | .text |
|---|
| 23 | /* |
|---|
| 24 | * Flush MMU TLB |
|---|
| 25 | * |
|---|
| 26 | * We avoid flushing the pinned 0, 1 and possibly 2 entries. |
|---|
| 27 | */ |
|---|
| 28 | .globl _tlbia; |
|---|
| 29 | .type _tlbia, @function |
|---|
| 30 | .align 4; |
|---|
| 31 | _tlbia: |
|---|
| 32 | lwi r12, r0, tlb_skip; |
|---|
| 33 | /* isync */ |
|---|
| 34 | _tlbia_1: |
|---|
| 35 | mts rtlbx, r12 |
|---|
| 36 | nop |
|---|
| 37 | mts rtlbhi, r0 /* flush: ensure V is clear */ |
|---|
| 38 | nop |
|---|
| 39 | rsubi r11, r12, MICROBLAZE_TLB_SIZE - 1 |
|---|
| 40 | bneid r11, _tlbia_1 /* loop for all entries */ |
|---|
| 41 | addik r12, r12, 1 |
|---|
| 42 | mbar 1 /* sync */ |
|---|
| 43 | rtsd r15, 8 |
|---|
| 44 | nop |
|---|
| 45 | .size _tlbia, . - _tlbia |
|---|
| 46 | |
|---|
| 47 | /* |
|---|
| 48 | * Flush MMU TLB for a particular address (in r5) |
|---|
| 49 | */ |
|---|
| 50 | .globl _tlbie; |
|---|
| 51 | .type _tlbie, @function |
|---|
| 52 | .align 4; |
|---|
| 53 | _tlbie: |
|---|
| 54 | mts rtlbsx, r5 /* look up the address in TLB */ |
|---|
| 55 | nop |
|---|
| 56 | mfs r12, rtlbx /* Retrieve index */ |
|---|
| 57 | nop |
|---|
| 58 | blti r12, _tlbie_1 /* Check if found */ |
|---|
| 59 | mts rtlbhi, r0 /* flush: ensure V is clear */ |
|---|
| 60 | nop |
|---|
| 61 | mbar 1 /* sync */ |
|---|
| 62 | _tlbie_1: |
|---|
| 63 | rtsd r15, 8 |
|---|
| 64 | nop |
|---|
| 65 | |
|---|
| 66 | .size _tlbie, . - _tlbie |
|---|
| 67 | |
|---|
