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kernel/arch/arm: swap TTBR on thread context switch

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Change-Id: Ie85742d077866c10ba57b46848d5acaef932615e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4982
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>
Reviewed-by: X512 <[email protected]>
Reviewed-by: Fredrik Holmqvist <[email protected]>
This commit is contained in:
David Karoly
2022-02-24 16:49:58 +00:00
committed by Fredrik Holmqvist
parent f06e0279a5
commit b22c6f6f29
1 changed files with 36 additions and 1 deletions
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src/system/kernel/arch/arm/arch_thread.cpp
+36 -1
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@@ -1,5 +1,5 @@
/*
* Copyright 2003-2010, Haiku Inc. All rights reserved.
* Copyright 2003-2022, Haiku Inc. All rights reserved.
* Distributed under the terms of the MIT License.
*
* Authors:
@@ -28,6 +28,9 @@
#include <string.h>
#include "ARMPagingStructures.h"
#include "ARMVMTranslationMap.h"
//#define TRACE_ARCH_THREAD
#ifdef TRACE_ARCH_THREAD
# define TRACE(x) dprintf x
@@ -131,9 +134,41 @@ arch_thread_init_tls(Thread *thread)
extern "C" void arm_context_switch(void *from, void *to);
void
arm_swap_pgdir(uint32_t pageDirectoryAddress)
{
// Set translation table base
asm volatile("MCR p15, 0, %[addr], c2, c0, 0"::[addr] "r" (pageDirectoryAddress));
isb();
arch_cpu_global_TLB_invalidate();
//TODO: update Context ID (incl. ASID)
//TODO: check if any additional TLB or Cache maintenance is needed
}
void
arch_thread_context_switch(Thread *from, Thread *to)
{
VMAddressSpace *oldAddressSpace = from->team->address_space;
VMTranslationMap *oldTranslationMap = oldAddressSpace->TranslationMap();
phys_addr_t oldPageDirectoryAddress =
((ARMVMTranslationMap *)oldTranslationMap)->PagingStructures()->pgdir_phys;
VMAddressSpace *newAddressSpace = to->team->address_space;
VMTranslationMap *newTranslationMap = newAddressSpace->TranslationMap();
phys_addr_t newPageDirectoryAddress =
((ARMVMTranslationMap *)newTranslationMap)->PagingStructures()->pgdir_phys;
if (oldPageDirectoryAddress != newPageDirectoryAddress) {
TRACE(("arch_thread_context_switch: swap pgdir: "
"0x%08" B_PRIxPHYSADDR " -> 0x%08" B_PRIxPHYSADDR "\n",
oldPageDirectoryAddress, newPageDirectoryAddress));
arm_swap_pgdir(newPageDirectoryAddress);
}
TRACE(("arch_thread_context_switch: %p(%s/%p) -> %p(%s/%p)\n",
from, from->name, from->arch_info.sp, to, to->name, to->arch_info.sp));
arm_context_switch(&from->arch_info, &to->arch_info);