597b9e9d71
This removes the need for a tool to generate simple identity pages. Future patches will link this page table directly into the stages on some platforms so having an assembly file makes a lot of sense. This also optimizes the size of the page of each 4K page by placing the PDPE_table below the PDE. Change-Id: Ia1e31b701a2584268c85d327bf139953213899e3 Signed-off-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-on: https://review.coreboot.org/c/coreboot/+/63725 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Raul Rangel <rrangel@chromium.org>
36 lines
852 B
ArmAsm
36 lines
852 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* For reference see "AMD64 Architecture Programmer's Manual Volume 2",
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* Document 24593-Rev. 3.31-July 2019 Chapter 5.3.4
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*
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* Page table attributes: WB, User+Supervisor, Present, Writeable, Accessed, Dirty
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*/
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.section .rodata
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#define _PRES (1ULL << 0)
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#define _RW (1ULL << 1)
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#define _US (1ULL << 2)
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#define _A (1ULL << 5)
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#define _D (1ULL << 6)
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#define _PS (1ULL << 7)
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#define _GEN_DIR(a) (_PRES + _RW + _US + _A + (a))
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#define _GEN_PAGE(a) (_PRES + _RW + _US + _PS + _A + _D + (a))
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.global PM4LE
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.align 32
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PM4LE:
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.quad _GEN_DIR(PDPE_table)
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.align 4096
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PDE_tables: /* identity map 2MiB pages */
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.rept 2048
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.quad _GEN_PAGE(0x200000 * ((. - PDE_tables) >> 3))
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.endr
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.align 4096
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PDPE_table: /* Point to PDE */
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.rept 4
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.quad _GEN_DIR(PDE_tables + 4096 * ((. - PDPE_table) >> 3))
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.endr
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