mirror of
https://github.com/Fennix-Project/Kernel.git
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100 lines
2.4 KiB
C++
100 lines
2.4 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 <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/mmap.html */
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void *sys_mmap(SysFrm *,
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void *addr, size_t len,
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int prot, int flags,
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int fildes, off_t off)
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{
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if (len == 0)
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return (void *)-EINVAL;
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if (fildes != -1)
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return (void *)-ENOSYS;
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bool p_None = prot & sc_PROT_NONE;
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bool p_Read = prot & sc_PROT_READ;
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bool p_Write = prot & sc_PROT_WRITE;
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bool p_Exec = prot & sc_PROT_EXEC;
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bool m_Shared = flags & sc_MAP_SHARED;
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bool m_Private = flags & sc_MAP_PRIVATE;
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bool m_Fixed = flags & sc_MAP_FIXED;
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bool m_Anon = flags & sc_MAP_ANONYMOUS;
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UNUSED(p_None);
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UNUSED(m_Anon);
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debug("N:%d R:%d W:%d E:%d",
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p_None, p_Read, p_Write,
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p_Exec);
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debug("S:%d P:%d F:%d A:%d",
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m_Shared, m_Private,
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m_Fixed, m_Anon);
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int UnknownFlags = flags & ~(sc_MAP_SHARED |
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sc_MAP_PRIVATE |
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sc_MAP_FIXED |
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sc_MAP_ANONYMOUS);
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if (UnknownFlags)
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{
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debug("Unknown flags: %x", UnknownFlags);
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return (void *)-EINVAL;
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}
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if (len > PAGE_SIZE_2M)
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fixme("large page 2 MiB (requested %d)",
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TO_MiB(len));
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else if (len > PAGE_SIZE_1G)
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fixme("huge page 1 GiB (requested %d)",
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TO_GiB(len));
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if (off % PAGE_SIZE)
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return (void *)-EINVAL;
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if (uintptr_t(addr) % PAGE_SIZE && m_Fixed)
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return (void *)-EINVAL;
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if ((m_Shared && m_Private) ||
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(!m_Shared && !m_Private))
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return (void *)-EINVAL;
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PCB *pcb = thisProcess;
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VirtualMemoryArea *vma = pcb->vma;
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intptr_t ret = (intptr_t)vma->CreateCoWRegion(addr, len,
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p_Read, p_Write, p_Exec,
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m_Fixed, m_Shared);
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return (void *)ret;
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}
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