38 lines
2.5 KiB
C
38 lines
2.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "ape/lib/pc.h"
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#include "ape/relocations.h"
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#include "libc/runtime/runtime.h"
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textreal static void __map_segment(uint64_t k, uint64_t a, uint64_t b) {
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uint64_t *e;
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for (; a < b; a += 0x1000) {
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e = __getpagetableentry(IMAGE_BASE_VIRTUAL + a, 3, &g_pml4t, &g_ptsp_xlm);
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*e = (IMAGE_BASE_REAL + a) | k;
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}
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}
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textreal void __map_image(void) {
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__map_segment(PAGE_V | PAGE_U, 0, (uintptr_t)_etext - IMAGE_BASE_VIRTUAL);
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__map_segment(PAGE_V | PAGE_U | PAGE_RW | PAGE_XD,
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(uintptr_t)_etext - IMAGE_BASE_VIRTUAL,
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(uintptr_t)_end - IMAGE_BASE_VIRTUAL);
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}
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