9da42dde2f
Previously, we did the protection-domain switches without a transitional translation table that contains only global mappings. This was fine as long as the CPU did no speculative memory accesses. However, to enabling branch prediction triggers such accesses. Thus, if we don't want to invalidate predictors on every context switch, we need to switch more carefully. ref #474
81 lines
1.9 KiB
ArmAsm
81 lines
1.9 KiB
ArmAsm
/*
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* \brief Mode transition definitions used by all ARM architectures
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* \author Stefan Kalkowski
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* \date 2014-06-12
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*/
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/*
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* Copyright (C) 2014 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/***************************************************
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** Constant values that the mode transition uses **
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***************************************************/
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/* kernel names of exceptions that can interrupt a user */
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.set RST_TYPE, 1
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.set UND_TYPE, 2
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.set SVC_TYPE, 3
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.set PAB_TYPE, 4
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.set DAB_TYPE, 5
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.set IRQ_TYPE, 6
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.set FIQ_TYPE, 7
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.set RST_PC_ADJUST, 0
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.set UND_PC_ADJUST, 4
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.set SVC_PC_ADJUST, 0
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.set PAB_PC_ADJUST, 4
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.set DAB_PC_ADJUST, 8
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.set IRQ_PC_ADJUST, 4
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.set FIQ_PC_ADJUST, 4
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/* offsets of the member variables in a processor context */
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.set R12_OFFSET, 12 * 4
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.set SP_OFFSET, 13 * 4
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.set LR_OFFSET, 14 * 4
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.set PC_OFFSET, 15 * 4
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.set PSR_OFFSET, 16 * 4
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.set EXCEPTION_TYPE_OFFSET, 17 * 4
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.set TRANSIT_TTBR0_OFFSET, 17 * 4
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.set CIDR_OFFSET, 18 * 4
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.set TTBR0_OFFSET, 19 * 4
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/* size of local variables */
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.set CONTEXT_PTR_SIZE, 1 * 4
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/*********************************************************
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** Local data structures that the mode transition uses **
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*********************************************************/
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.macro _mt_local_variables
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/* space for a copy of the kernel context */
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.p2align 2
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.global _mt_master_context_begin
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_mt_master_context_begin:
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.space 32 * 4
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.global _mt_master_context_end
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_mt_master_context_end:
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/* space for a client context-pointer per processor */
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.p2align 2
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.global _mt_client_context_ptr
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_mt_client_context_ptr:
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.rept PROCESSORS
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.space CONTEXT_PTR_SIZE
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.endr
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/* a globally mapped buffer per processor */
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.p2align 2
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.global _mt_buffer
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_mt_buffer:
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.rept PROCESSORS
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.space BUFFER_SIZE
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.endr
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.endm /* _mt_local_variables */
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