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microblaze_mmu_v2: TLB low level code

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Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2009-05-26 16:30:10 +02:00
parent a43acfbbc8
commit 3f50425c0c
1 changed files with 120 additions and 0 deletions
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arch/microblaze/kernel/misc.S Normal file
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/*
* 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, 2
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