| /* |
| * 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; |
| .align 4; |
| _tlbia: |
| addik r12, r0, 63 /* 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 |
| |
| /* |
| * Flush MMU TLB for a particular address (in r5) |
| */ |
| .globl _tlbie; |
| .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 |
| |
| /* |
| * Allocate TLB entry for early console |
| */ |
| .globl early_console_reg_tlb_alloc; |
| .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, 63 |
| mts rtlbx, r4 /* TLB slot 2 */ |
| |
| 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 |
| |
| /* |
| * Copy a whole page (4096 bytes). |
| */ |
| #define COPY_16_BYTES \ |
| lwi r7, r6, 0; \ |
| lwi r8, r6, 4; \ |
| lwi r9, r6, 8; \ |
| lwi r10, r6, 12; \ |
| swi r7, r5, 0; \ |
| swi r8, r5, 4; \ |
| swi r9, r5, 8; \ |
| swi r10, r5, 12 |
| |
| |
| /* FIXME DCACHE_LINE_BYTES (CONFIG_XILINX_MICROBLAZE0_DCACHE_LINE_LEN * 4)*/ |
| #define DCACHE_LINE_BYTES (4 * 4) |
| |
| .globl copy_page; |
| .align 4; |
| copy_page: |
| ori r11, r0, (PAGE_SIZE/DCACHE_LINE_BYTES) - 1 |
| _copy_page_loop: |
| COPY_16_BYTES |
| #if DCACHE_LINE_BYTES >= 32 |
| COPY_16_BYTES |
| #endif |
| addik r6, r6, DCACHE_LINE_BYTES |
| addik r5, r5, DCACHE_LINE_BYTES |
| bneid r11, _copy_page_loop |
| addik r11, r11, -1 |
| rtsd r15, 8 |
| nop |