| /* |
| * 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 |
