81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
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#define MODULE "mem"
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#include "interrupts/Context.h"
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#include "log/Log.h"
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#include "memory/MemoryManager.h"
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#include "memory/VMM.h"
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#include <stddef.h>
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void sys_mmap(Context* context, void* address, size_t size, int flags)
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{
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if (size < 4096)
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{
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kdbgln("sys_mmap: size too small");
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context->rax = 0;
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return;
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}
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int real_flags = MAP_USER;
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if (flags & MAP_READ_WRITE) real_flags |= MAP_READ_WRITE;
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if (address)
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{
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kdbgln("sys_mmap: %ld pages at address %lx, %s", size / 4096, (uint64_t)address,
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real_flags & MAP_READ_WRITE ? "rw" : "ro");
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if (kernelVMM.getPhysical((uint64_t)address) != (uint64_t)-1) // Address is already used.
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{
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kdbgln("attempt to mmap an already mapped address");
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context->rax = 0;
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return;
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}
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uint64_t offset = (uint64_t)address % 4096;
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void* result = MemoryManager::get_pages_at((uint64_t)address - offset, size / 4096, real_flags);
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if (result)
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{
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kdbgln("mmap succeeded: %lx", (uint64_t)result);
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context->rax = (uint64_t)result;
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return;
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}
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else
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{
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kdbgln("mmap failed");
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context->rax = 0;
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return;
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}
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}
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kdbgln("sys_mmap: %ld pages at any address, %s", size / 4096, real_flags & MAP_READ_WRITE ? "rw" : "ro");
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void* result = MemoryManager::get_pages(size / 4096, real_flags);
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if (result)
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{
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kdbgln("mmap succeeded: %lx", (uint64_t)result);
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context->rax = (uint64_t)result;
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return;
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}
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else
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{
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kdbgln("mmap failed");
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context->rax = 0;
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return;
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}
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}
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void sys_munmap(Context* context, void* address, size_t size)
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{
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kdbgln("sys_munmap: attempting to unmap %lx", (uint64_t)address);
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if (!address)
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{
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kdbgln("munmap failed: attempted to unmap page 0");
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context->rax = -1;
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return;
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}
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int flags = kernelVMM.getFlags((uint64_t)address);
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if (!(flags & MAP_USER))
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{
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kdbgln("munmap failed: attempted to unmap a kernel page");
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context->rax = -1;
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return;
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}
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uint64_t offset = (uint64_t)address % 4096;
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MemoryManager::release_pages((void*)((uint64_t)address - offset), size / 4096);
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kdbgln("munmap succeeded");
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context->rax = 0;
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return;
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}
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