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200 lines
4.0 KiB
200 lines
4.0 KiB
16 years ago
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/*
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* arch/score/mm/tlbex.S
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*
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* Score Processor version.
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*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Lennox Wu <lennox.wu@sunplusct.com>
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* Chen Liqin <liqin.chen@sunplusct.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <asm/asmmacro.h>
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#include <asm/pgtable-bits.h>
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#include <asm/scoreregs.h>
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/*
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* After this macro runs, the pte faulted on is
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* in register PTE, a ptr into the table in which
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* the pte belongs is in PTR.
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*/
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.macro load_pte, pte, ptr
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la \ptr, pgd_current
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lw \ptr, [\ptr, 0]
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mfcr \pte, cr6
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srli \pte, \pte, 22
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slli \pte, \pte, 2
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add \ptr, \ptr, \pte
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lw \ptr, [\ptr, 0]
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mfcr \pte, cr6
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srli \pte, \pte, 10
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andi \pte, 0xffc
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add \ptr, \ptr, \pte
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lw \pte, [\ptr, 0]
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.endm
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.macro pte_reload, ptr
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lw \ptr, [\ptr, 0]
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mtcr \ptr, cr12
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nop
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nop
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nop
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nop
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nop
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.endm
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.macro do_fault, write
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SAVE_ALL
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mfcr r6, cr6
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mv r4, r0
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ldi r5, \write
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la r8, do_page_fault
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brl r8
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j ret_from_exception
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.endm
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.macro pte_writable, pte, ptr, label
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andi \pte, 0x280
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cmpi.c \pte, 0x280
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bne \label
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lw \pte, [\ptr, 0] /*reload PTE*/
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.endm
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/*
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* Make PTE writable, update software status bits as well,
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* then store at PTR.
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*/
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.macro pte_makewrite, pte, ptr
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ori \pte, 0x426
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sw \pte, [\ptr, 0]
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.endm
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.text
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ENTRY(score7_FTLB_refill_Handler)
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la r31, pgd_current /* get pgd pointer */
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lw r31, [r31, 0] /* get the address of PGD */
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mfcr r30, cr6
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srli r30, r30, 22 /* PGDIR_SHIFT = 22*/
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slli r30, r30, 2
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add r31, r31, r30
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lw r31, [r31, 0] /* get the address of the start address of PTE table */
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mfcr r30, cr9
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andi r30, 0xfff /* equivalent to get PET index and right shift 2 bits */
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add r31, r31, r30
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lw r30, [r31, 0] /* load pte entry */
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mtcr r30, cr12
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nop
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nop
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nop
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nop
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nop
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mtrtlb
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nop
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nop
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nop
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nop
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nop
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rte /* 6 cycles to make sure tlb entry works */
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ENTRY(score7_KSEG_refill_Handler)
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la r31, pgd_current /* get pgd pointer */
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lw r31, [r31, 0] /* get the address of PGD */
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mfcr r30, cr6
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srli r30, r30, 22 /* PGDIR_SHIFT = 22 */
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slli r30, r30, 2
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add r31, r31, r30
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lw r31, [r31, 0] /* get the address of the start address of PTE table */
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mfcr r30, cr6 /* get Bad VPN */
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srli r30, r30, 10
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andi r30, 0xffc /* PTE VPN mask (bit 11~2) */
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add r31, r31, r30
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lw r30, [r31, 0] /* load pte entry */
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mtcr r30, cr12
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nop
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nop
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nop
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nop
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nop
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mtrtlb
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nop
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nop
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nop
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nop
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nop
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rte /* 6 cycles to make sure tlb entry works */
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nopage_tlbl:
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do_fault 0 /* Read */
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ENTRY(handle_tlb_refill)
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load_pte r30, r31
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pte_writable r30, r31, handle_tlb_refill_nopage
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pte_makewrite r30, r31 /* Access|Modify|Dirty|Valid */
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pte_reload r31
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mtrtlb
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nop
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nop
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nop
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nop
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nop
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rte
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handle_tlb_refill_nopage:
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do_fault 0 /* Read */
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ENTRY(handle_tlb_invaild)
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load_pte r30, r31
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stlb /* find faulting entry */
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pte_writable r30, r31, handle_tlb_invaild_nopage
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pte_makewrite r30, r31 /* Access|Modify|Dirty|Valid */
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pte_reload r31
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mtptlb
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nop
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nop
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nop
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nop
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nop
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rte
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handle_tlb_invaild_nopage:
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do_fault 0 /* Read */
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ENTRY(handle_mod)
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load_pte r30, r31
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stlb /* find faulting entry */
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andi r30, _PAGE_WRITE /* Writable? */
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cmpz.c r30
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beq nowrite_mod
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lw r30, [r31, 0] /* reload into r30 */
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/* Present and writable bits set, set accessed and dirty bits. */
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pte_makewrite r30, r31
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/* Now reload the entry into the tlb. */
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pte_reload r31
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mtptlb
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nop
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nop
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nop
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nop
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nop
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rte
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nowrite_mod:
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do_fault 1 /* Write */
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