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their duration. This is still only effective as long as they are only used in the static kernel. Code in modules may cause instruction faults which makes these break in different ways anyway. 2. Add a load bearing membar #Sync. 3. Add an inline for demapping an entire context. Submitted by: tmm (1, 2)
243 lines
6.6 KiB
C
243 lines
6.6 KiB
C
/*-
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* Copyright (c) 2001 Jake Burkholder.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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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* $FreeBSD$
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*/
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#ifndef _MACHINE_TLB_H_
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#define _MACHINE_TLB_H_
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#define TLB_SLOT_COUNT 64
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#define TLB_SLOT_TSB_KERNEL_MIN 60 /* XXX */
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#define TLB_SLOT_TSB_USER_PRIMARY 61
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#define TLB_SLOT_TSB_USER_SECONDARY 62
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#define TLB_SLOT_KERNEL 63
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#define TLB_DAR_SLOT_SHIFT (3)
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#define TLB_DAR_SLOT(slot) ((slot) << TLB_DAR_SLOT_SHIFT)
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#define TLB_TAR_VA(va) ((va) & ~PAGE_MASK)
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#define TLB_TAR_CTX(ctx) ((ctx) & PAGE_MASK)
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#define TLB_DEMAP_ID_SHIFT (4)
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#define TLB_DEMAP_ID_PRIMARY (0)
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#define TLB_DEMAP_ID_SECONDARY (1)
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#define TLB_DEMAP_ID_NUCLEUS (2)
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#define TLB_DEMAP_TYPE_SHIFT (6)
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#define TLB_DEMAP_TYPE_PAGE (0)
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#define TLB_DEMAP_TYPE_CONTEXT (1)
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#define TLB_DEMAP_VA(va) ((va) & ~PAGE_MASK)
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#define TLB_DEMAP_ID(id) ((id) << TLB_DEMAP_ID_SHIFT)
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#define TLB_DEMAP_TYPE(type) ((type) << TLB_DEMAP_TYPE_SHIFT)
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#define TLB_DEMAP_PAGE (TLB_DEMAP_TYPE(TLB_DEMAP_TYPE_PAGE))
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#define TLB_DEMAP_CONTEXT (TLB_DEMAP_TYPE(TLB_DEMAP_TYPE_CONTEXT))
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#define TLB_DEMAP_PRIMARY (TLB_DEMAP_ID(TLB_DEMAP_ID_PRIMARY))
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#define TLB_DEMAP_SECONDARY (TLB_DEMAP_ID(TLB_DEMAP_ID_SECONDARY))
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#define TLB_DEMAP_NUCLEUS (TLB_DEMAP_ID(TLB_DEMAP_ID_NUCLEUS))
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#define TLB_CTX_KERNEL (0)
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#define TLB_DTLB (1 << 0)
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#define TLB_ITLB (1 << 1)
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#define MMU_SFSR_ASI_SHIFT (16)
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#define MMU_SFSR_FT_SHIFT (7)
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#define MMU_SFSR_E_SHIFT (6)
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#define MMU_SFSR_CT_SHIFT (4)
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#define MMU_SFSR_PR_SHIFT (3)
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#define MMU_SFSR_W_SHIFT (2)
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#define MMU_SFSR_OW_SHIFT (1)
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#define MMU_SFSR_FV_SHIFT (0)
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#define MMU_SFSR_ASI_SIZE (8)
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#define MMU_SFSR_FT_SIZE (6)
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#define MMU_SFSR_CT_SIZE (2)
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#define MMU_SFSR_W (1L << MMU_SFSR_W_SHIFT)
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/*
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* Some tlb operations must be atomical, so no interrupt or trap can be allowed
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* while they are in progress. Traps should not happen, but interrupts need to
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* be explicitely disabled. critical_enter() cannot be used here, since it only
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* disables soft interrupts.
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* XXX: is something like this needed elsewhere, too?
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*/
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#define TLB_ATOMIC_START(s) do { \
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(s) = rdpr(pstate); \
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wrpr(pstate, (s) & ~PSTATE_IE, 0); \
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} while (0)
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#define TLB_ATOMIC_END(s) wrpr(pstate, (s), 0)
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static __inline void
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tlb_dtlb_context_primary_demap(void)
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{
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stxa(TLB_DEMAP_PRIMARY | TLB_DEMAP_CONTEXT, ASI_DMMU_DEMAP, 0);
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membar(Sync);
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}
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static __inline void
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tlb_dtlb_page_demap(u_long ctx, vm_offset_t va)
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{
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if (ctx == TLB_CTX_KERNEL) {
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stxa(TLB_DEMAP_VA(va) | TLB_DEMAP_NUCLEUS | TLB_DEMAP_PAGE,
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ASI_DMMU_DEMAP, 0);
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membar(Sync);
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} else {
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stxa(AA_DMMU_SCXR, ASI_DMMU, ctx);
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membar(Sync);
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stxa(TLB_DEMAP_VA(va) | TLB_DEMAP_SECONDARY | TLB_DEMAP_PAGE,
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ASI_DMMU_DEMAP, 0);
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membar(Sync);
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stxa(AA_DMMU_SCXR, ASI_DMMU, 0);
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membar(Sync);
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}
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}
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static __inline void
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tlb_dtlb_store(vm_offset_t va, u_long ctx, struct tte tte)
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{
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u_long pst;
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TLB_ATOMIC_START(pst);
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stxa(AA_DMMU_TAR, ASI_DMMU,
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TLB_TAR_VA(va) | TLB_TAR_CTX(ctx));
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stxa(0, ASI_DTLB_DATA_IN_REG, tte.tte_data);
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membar(Sync);
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TLB_ATOMIC_END(pst);
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}
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static __inline void
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tlb_dtlb_store_slot(vm_offset_t va, u_long ctx, struct tte tte, int slot)
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{
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u_long pst;
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TLB_ATOMIC_START(pst);
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stxa(AA_DMMU_TAR, ASI_DMMU, TLB_TAR_VA(va) | TLB_TAR_CTX(ctx));
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stxa(TLB_DAR_SLOT(slot), ASI_DTLB_DATA_ACCESS_REG, tte.tte_data);
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membar(Sync);
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TLB_ATOMIC_END(pst);
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}
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static __inline void
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tlb_itlb_context_primary_demap(void)
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{
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stxa(TLB_DEMAP_PRIMARY | TLB_DEMAP_CONTEXT, ASI_IMMU_DEMAP, 0);
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membar(Sync);
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}
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static __inline void
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tlb_itlb_page_demap(u_long ctx, vm_offset_t va)
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{
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if (ctx == TLB_CTX_KERNEL) {
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stxa(TLB_DEMAP_VA(va) | TLB_DEMAP_NUCLEUS | TLB_DEMAP_PAGE,
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ASI_IMMU_DEMAP, 0);
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flush(KERNBASE);
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} else {
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stxa(AA_DMMU_SCXR, ASI_DMMU, ctx);
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membar(Sync);
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stxa(TLB_DEMAP_VA(va) | TLB_DEMAP_SECONDARY | TLB_DEMAP_PAGE,
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ASI_IMMU_DEMAP, 0);
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membar(Sync);
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stxa(AA_DMMU_SCXR, ASI_DMMU, 0);
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/* flush probably not needed. */
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membar(Sync);
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}
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}
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static __inline void
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tlb_itlb_store(vm_offset_t va, u_long ctx, struct tte tte)
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{
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u_long pst;
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TLB_ATOMIC_START(pst);
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stxa(AA_IMMU_TAR, ASI_IMMU, TLB_TAR_VA(va) | TLB_TAR_CTX(ctx));
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stxa(0, ASI_ITLB_DATA_IN_REG, tte.tte_data);
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if (ctx == TLB_CTX_KERNEL)
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flush(va);
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else {
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/*
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* flush probably not needed and impossible here, no access to
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* user page.
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*/
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membar(Sync);
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}
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TLB_ATOMIC_END(pst);
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}
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static __inline void
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tlb_context_primary_demap(u_int tlb)
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{
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if (tlb & TLB_DTLB)
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tlb_dtlb_context_primary_demap();
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if (tlb & TLB_ITLB)
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tlb_itlb_context_primary_demap();
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}
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static __inline void
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tlb_itlb_store_slot(vm_offset_t va, u_long ctx, struct tte tte, int slot)
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{
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u_long pst;
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TLB_ATOMIC_START(pst);
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stxa(AA_IMMU_TAR, ASI_IMMU, TLB_TAR_VA(va) | TLB_TAR_CTX(ctx));
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stxa(TLB_DAR_SLOT(slot), ASI_ITLB_DATA_ACCESS_REG, tte.tte_data);
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flush(va);
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TLB_ATOMIC_END(pst);
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}
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static __inline void
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tlb_page_demap(u_int tlb, u_int ctx, vm_offset_t va)
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{
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if (tlb & TLB_DTLB)
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tlb_dtlb_page_demap(ctx, va);
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if (tlb & TLB_ITLB)
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tlb_itlb_page_demap(ctx, va);
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}
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static __inline void
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tlb_store(u_int tlb, vm_offset_t va, u_long ctx, struct tte tte)
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{
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if (tlb & TLB_DTLB)
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tlb_dtlb_store(va, ctx, tte);
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if (tlb & TLB_ITLB)
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tlb_itlb_store(va, ctx, tte);
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}
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static __inline void
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tlb_store_slot(u_int tlb, vm_offset_t va, u_long ctx, struct tte tte, int slot)
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{
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if (tlb & TLB_DTLB)
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tlb_dtlb_store_slot(va, ctx, tte, slot);
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if (tlb & TLB_ITLB)
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tlb_itlb_store_slot(va, ctx, tte, slot);
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}
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#endif /* !_MACHINE_TLB_H_ */
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