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61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <syscalls.hpp>
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#include <memory.hpp>
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#include <lock.hpp>
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#include <exec.hpp>
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#include <errno.h>
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#include <debug.h>
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#include "../../syscalls.h"
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#include "../../kernel.h"
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using Tasking::PCB;
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using namespace Memory;
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/* https://pubs.opengroup.org/onlinepubs/009604499/functions/munmap.html */
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int sys_munmap(SysFrm *,
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void *addr, size_t len)
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{
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if (uintptr_t(addr) % PAGE_SIZE)
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return -EINVAL;
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if (len == 0)
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return -EINVAL;
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PCB *pcb = thisProcess;
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VirtualMemoryArea *vma = pcb->vma;
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Virtual vmm = Virtual(pcb->PageTable);
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for (uintptr_t i = uintptr_t(addr);
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i < uintptr_t(addr) + len;
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i += PAGE_SIZE)
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{
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if (likely(!vmm.Check((void *)i, G)))
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vmm.Remap((void *)i, (void *)i, P | RW);
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else
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warn("%p is a global page", (void *)i);
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}
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/* TODO: Check if the page is allocated
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and not only mapped */
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vma->FreePages((void *)addr, TO_PAGES(len) + 1);
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return 0;
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}
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