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https://github.com/SerenityOS/serenity
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a838fdfd88
While the "regular" quickmap (used to temporarily map a physical page at a known address for quick access) has been per-CPU for a while, we also have the PD (page directory) and PT (page table) quickmaps used by the memory management code to edit page tables. These have been global, which meant that SMP systems had to keep fighting over them. This patch makes *all* quickmaps per-CPU. We reserve virtual addresses for up to 64 CPUs worth of quickmaps for now. Note that all quickmaps are still protected by the MM lock, and we'll have to fix that too, before seeing any real throughput improvements.
28 lines
951 B
C
28 lines
951 B
C
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Platform.h>
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#ifdef __cplusplus
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# include <AK/Types.h>
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# include <Kernel/BootInfo.h>
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#endif
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#define READONLY_AFTER_INIT __attribute__((section(".ro_after_init")))
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#define UNMAP_AFTER_INIT NEVER_INLINE __attribute__((section(".unmap_after_init")))
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#define KERNEL_PD_END (kernel_mapping_base + KERNEL_PD_SIZE)
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#define KERNEL_PT1024_BASE (kernel_mapping_base + 0x3FE00000)
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#define KERNEL_MAX_CPU_COUNT 64
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#define KERNEL_QUICKMAP_PT_PER_CPU_BASE (KERNEL_PT1024_BASE + (1 * KERNEL_MAX_CPU_COUNT * PAGE_SIZE))
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#define KERNEL_QUICKMAP_PD_PER_CPU_BASE (KERNEL_PT1024_BASE + (2 * KERNEL_MAX_CPU_COUNT * PAGE_SIZE))
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#define KERNEL_QUICKMAP_PER_CPU_BASE (KERNEL_PT1024_BASE + (3 * KERNEL_MAX_CPU_COUNT * PAGE_SIZE))
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#define USER_RANGE_BASE 0x10000
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#define USER_RANGE_CEILING (kernel_mapping_base - 0x2000000)
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