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https://github.com/jart/cosmopolitan.git
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0da47c51de
* [metal] Copy program pages to extended memory at startup * [metal] Reclaim base memory pages for later app use * [metal] Load program pages beyond 1st 440 KiB to extended memory o//examples/hellolua.com now runs correctly under QEMU (in legacy BIOS mode). * [metal] Place GDT in read/write segment The CPU absolutely needs to alter the GDT when loading the task register (via ltr). To account for this, I move the GDT into a read/write data section. There is still a "rump" read-only GDT in the text section that is used by the real mode bootloader. We also delay the loading of the task register (ltr) until after the IDT and TSS are finally set up. * [metal] Get examples/vga2.c serial output working for UEFI boot * [metal] Get examples/vga2.c VGA output working for UEFI boot * [metal] Allow munmap() to reclaim dynamically allocated pages * Place TLS sections right after .text, not after embedded zip file Co-authored-by: tkchia <tkchia-cosmo@gmx.com>
38 lines
2.3 KiB
C
38 lines
2.3 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 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/intrin/directmap.internal.h"
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#include "libc/runtime/pc.internal.h"
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noasan int sys_munmap_metal(void *addr, size_t size) {
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size_t i;
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uint64_t *e, paddr;
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struct mman *mm;
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uint64_t *pml4t = __get_pml4t();
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mm = (struct mman *)(BANE + 0x0500);
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for (i = 0; i < size; i += 4096) {
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e = __get_virtual(mm, pml4t, (uint64_t)addr + i, false);
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if (e) {
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paddr = *e & PAGE_TA;
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*e &= ~(PAGE_V | PAGE_RSRV);
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invlpg((uint64_t)addr + i);
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__unref_page(mm, pml4t, paddr);
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}
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}
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return 0;
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}
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