RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 10:38:11 +00:00
Code Issues Activity Actions

UserspaceEmulator: Add basic support for memory-mapped files

Browse source 
MmapRegion now supports using an mmap'ed file descriptor as backing.
This commit is contained in:
Andreas Kling 2020-07-13 11:58:58 +02:00
parent 63d3f5d19b
commit 9b6464010f
3 changed files with 30 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

6
DevTools/UserspaceEmulator/Emulator.cpp
View file

@ -309,7 +309,6 @@ u32 Emulator::virt$mmap(u32 params_addr)
mmu().copy_from_vm(&params, params_addr, sizeof(params));
ASSERT(params.addr == 0);
ASSERT(params.flags & MAP_ANONYMOUS);
// FIXME: Write a proper VM allocator
static u32 next_address = 0x30000000;
@ -326,7 +325,10 @@ u32 Emulator::virt$mmap(u32 params_addr)
next_address = final_address + final_size;
mmu().add_region(make<MmapRegion>(final_address, final_size, params.prot));
if (params.flags & MAP_ANONYMOUS)
mmu().add_region(MmapRegion::create_anonymous(final_address, final_size, params.prot));
else
mmu().add_region(MmapRegion::create_file_backed(final_address, final_size, params.prot, params.flags, params.fd, params.offset));
return final_address;
}