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ccc64d13f3
Remove the modified tte bit and add a softwrite bit. Mappings are only writeable if they have been written to, thus in general modify just duplicates the write bit. The softwrite bit makes it easier to distinguish mappings which should be writeable but are not yet modified. Move the exec bit down one, it was being sign extended when used as an immediate operand. Use the lock bit to mean tsb page and remove the tsb bit. These are the only form of locked (tsb) entries we support and we need to conserve bits where possible. Implement pmap_copy_page and pmap_is_modified and friends. Detect mappings that are being being upgraded from read-only to read-write due to copy-on-write and update the write bit appropriately. Make trap_mmu_fault do the right thing for protection faults, which is necessary to implement copy on write correctly. Also handle a bunch more userland trap types and add ktr traces.
149 lines
4.4 KiB
C
149 lines
4.4 KiB
C
/*-
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* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Berkeley Software Design Inc's name may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: BSDI: pmap.v9.h,v 1.10.2.6 1999/08/23 22:18:44 cp Exp
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* $FreeBSD$
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*/
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#ifndef _MACHINE_TTE_H_
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#define _MACHINE_TTE_H_
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#include <machine/atomic.h>
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#define TTE_SHIFT 4
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#define STTE_SHIFT 5
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#define TT_CTX_SHIFT (48)
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#define TT_VA_SHIFT (22)
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#define TT_VPN_SHIFT (9)
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#define TT_CTX_SIZE (13)
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#define TT_VA_SIZE (42)
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#define TT_CTX_MASK ((1L << TT_CTX_SIZE) - 1)
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#define TT_VA_MASK ((1L << TT_VA_SIZE) - 1)
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#define TT_G (1L << 63)
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#define TT_CTX(ctx) (((u_long)(ctx) & TT_CTX_MASK) << TT_CTX_SHIFT)
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#define TT_VA(va) ((u_long)(va) >> TT_VA_SHIFT)
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#define TD_SIZE_SHIFT (61)
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#define TD_SOFT2_SHIFT (50)
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#define TD_DIAG_SHIFT (41)
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#define TD_PA_SHIFT (13)
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#define TD_SOFT_SHIFT (7)
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#define TD_SIZE_SIZE (2)
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#define TD_SOFT2_SIZE (9)
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#define TD_DIAG_SIZE (9)
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#define TD_PA_SIZE (28)
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#define TD_SOFT_SIZE (6)
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#define TD_SIZE_MASK (((1L << TD_SIZE_SIZE) - 1) << TD_SIZE_SHIFT)
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#define TD_SOFT2_MASK (((1L << TD_SOFT2_SIZE) - 1) << TD_SOFT2_SHIFT)
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#define TD_DIAG_MASK (((1L << TD_DIAG_SIZE) - 1) << TD_DIAG_SHIFT)
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#define TD_PA_MASK (((1L << TD_PA_SIZE) - 1) << TD_PA_SHIFT)
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#define TD_SOFT_MASK (((1L << TD_SOFT_SIZE) - 1) << TD_SOFT_SHIFT)
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#define TD_VA_LOW_SHIFT TD_SOFT2_SHIFT
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#define TD_VA_LOW_MASK TD_SOFT2_MASK
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#define TS_EXEC (1L << 4)
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#define TS_INIT (1L << 3)
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#define TS_MNG (1L << 2)
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#define TS_REF (1L << 1)
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#define TS_W (1L << 0)
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#define TD_V (1L << 63)
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#define TD_8K (0L << TD_SIZE_SHIFT)
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#define TD_64K (1L << TD_SIZE_SHIFT)
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#define TD_512K (2L << TD_SIZE_SHIFT)
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#define TD_4M (3L << TD_SIZE_SHIFT)
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#define TD_NFO (1L << 60)
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#define TD_IE (1L << 59)
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#define TD_VPN_LOW(vpn) ((vpn << TD_SOFT2_SHIFT) & TD_SOFT2_MASK)
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#define TD_VA_LOW(va) (TD_VPN_LOW((va) >> PAGE_SHIFT))
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#define TD_PA(pa) ((pa) & TD_PA_MASK)
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#define TD_EXEC (TS_EXEC << TD_SOFT_SHIFT)
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#define TD_INIT (TS_INIT << TD_SOFT_SHIFT)
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#define TD_MNG (TS_MNG << TD_SOFT_SHIFT)
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#define TD_REF (TS_REF << TD_SOFT_SHIFT)
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#define TD_SW (TS_W << TD_SOFT_SHIFT)
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#define TD_L (1L << 6)
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#define TD_CP (1L << 5)
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#define TD_CV (1L << 4)
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#define TD_E (1L << 3)
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#define TD_P (1L << 2)
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#define TD_W (1L << 1)
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#define TD_G (1L << 0)
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struct tte {
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u_long tte_tag;
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u_long tte_data;
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};
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struct stte {
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struct tte st_tte;
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vm_offset_t st_next;
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vm_offset_t st_prev;
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};
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static __inline u_int
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tte_get_ctx(struct tte tte)
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{
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return ((tte.tte_tag >> TT_CTX_SHIFT) & TT_CTX_MASK);
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}
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static __inline vm_offset_t
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tte_get_vpn(struct tte tte)
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{
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return (((tte.tte_tag & TT_VA_MASK) << TT_VPN_SHIFT) |
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((tte.tte_data & TD_VA_LOW_MASK) >> TD_VA_LOW_SHIFT));
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}
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static __inline vm_offset_t
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tte_get_va(struct tte tte)
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{
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return (tte_get_vpn(tte) << PAGE_SHIFT);
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}
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static __inline void
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tte_invalidate(struct tte *tp)
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{
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atomic_clear_long(&tp->tte_data, TD_V);
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}
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static __inline int
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tte_match(struct tte tte, vm_offset_t va)
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{
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return ((tte.tte_data & TD_V) != 0 &&
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((tte.tte_tag ^ TT_VA(va)) & TT_VA_MASK) == 0 &&
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((tte.tte_data ^ TD_VA_LOW(va)) & TD_VA_LOW_MASK) == 0);
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}
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#endif /* !_MACHINE_TTE_H_ */
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