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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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121 lines
2.4 KiB
ArmAsm
121 lines
2.4 KiB
ArmAsm
/*
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* Miscellaneous low-level MMU functions.
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*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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* Copyright (C) 2007 Xilinx, Inc. All rights reserved.
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*
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* Derived from arch/ppc/kernel/misc.S
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*/
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#include <linux/linkage.h>
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#include <linux/sys.h>
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#include <asm/unistd.h>
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#include <linux/errno.h>
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#include <asm/mmu.h>
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#include <asm/page.h>
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.text
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/*
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* Flush MMU TLB
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*
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* We avoid flushing the pinned 0, 1 and possibly 2 entries.
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*/
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.globl _tlbia;
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.align 4;
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_tlbia:
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addik r12, r0, 63 /* flush all entries (63 - 3) */
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/* isync */
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_tlbia_1:
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mts rtlbx, r12
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nop
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mts rtlbhi, r0 /* flush: ensure V is clear */
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nop
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addik r11, r12, -2
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bneid r11, _tlbia_1 /* loop for all entries */
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addik r12, r12, -1
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/* sync */
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rtsd r15, 8
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nop
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/*
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* Flush MMU TLB for a particular address (in r5)
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*/
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.globl _tlbie;
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.align 4;
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_tlbie:
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mts rtlbsx, r5 /* look up the address in TLB */
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nop
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mfs r12, rtlbx /* Retrieve index */
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nop
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blti r12, _tlbie_1 /* Check if found */
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mts rtlbhi, r0 /* flush: ensure V is clear */
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nop
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_tlbie_1:
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rtsd r15, 8
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nop
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/*
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* Allocate TLB entry for early console
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*/
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.globl early_console_reg_tlb_alloc;
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.align 4;
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early_console_reg_tlb_alloc:
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/*
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* Load a TLB entry for the UART, so that microblaze_progress() can use
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* the UARTs nice and early. We use a 4k real==virtual mapping.
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*/
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ori r4, r0, 2
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mts rtlbx, r4 /* TLB slot 2 */
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or r4,r5,r0
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andi r4,r4,0xfffff000
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ori r4,r4,(TLB_WR|TLB_I|TLB_M|TLB_G)
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andi r5,r5,0xfffff000
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ori r5,r5,(TLB_VALID | TLB_PAGESZ(PAGESZ_4K))
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mts rtlblo,r4 /* Load the data portion of the entry */
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nop
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mts rtlbhi,r5 /* Load the tag portion of the entry */
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nop
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rtsd r15, 8
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nop
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/*
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* Copy a whole page (4096 bytes).
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*/
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#define COPY_16_BYTES \
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lwi r7, r6, 0; \
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lwi r8, r6, 4; \
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lwi r9, r6, 8; \
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lwi r10, r6, 12; \
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swi r7, r5, 0; \
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swi r8, r5, 4; \
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swi r9, r5, 8; \
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swi r10, r5, 12
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/* FIXME DCACHE_LINE_BYTES (CONFIG_XILINX_MICROBLAZE0_DCACHE_LINE_LEN * 4)*/
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#define DCACHE_LINE_BYTES (4 * 4)
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.globl copy_page;
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.align 4;
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copy_page:
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ori r11, r0, (PAGE_SIZE/DCACHE_LINE_BYTES) - 1
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_copy_page_loop:
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COPY_16_BYTES
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#if DCACHE_LINE_BYTES >= 32
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COPY_16_BYTES
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#endif
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addik r6, r6, DCACHE_LINE_BYTES
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addik r5, r5, DCACHE_LINE_BYTES
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bneid r11, _copy_page_loop
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addik r11, r11, -1
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rtsd r15, 8
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nop
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