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Kernel+Userland: Remove shared buffers (shbufs)

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All users of this mechanism have been switched to anonymous files and
passing file descriptors with sendfd()/recvfd().

Shbufs got us where we are today, but it's time we say good-bye to them
and welcome a much more idiomatic replacement. :^)
This commit is contained in:
Andreas Kling 2021-01-17 08:51:41 +01:00
parent 2cd16778b5
commit bf0719092f
28 changed files with 2 additions and 1022 deletions
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51
Userland/DevTools/UserspaceEmulator/Emulator.cpp
View file

@ -26,7 +26,6 @@
#include "Emulator.h"
#include "MmapRegion.h"
#include "SharedBufferRegion.h"
#include "SimpleRegion.h"
#include "SoftCPU.h"
#include <AK/Format.h>
@ -385,14 +384,6 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
return virt$ioctl(arg1, arg2, arg3);
case SC_get_dir_entries:
return virt$get_dir_entries(arg1, arg2, arg3);
case SC_shbuf_create:
return virt$shbuf_create(arg1, arg2);
case SC_shbuf_allow_pid:
return virt$shbuf_allow_pid(arg1, arg2);
case SC_shbuf_get:
return virt$shbuf_get(arg1, arg2);
case SC_shbuf_release:
return virt$shbuf_release(arg1);
case SC_profiling_enable:
return virt$profiling_enable(arg1);
case SC_profiling_disable:
@ -560,48 +551,6 @@ int Emulator::virt$recvfd(int socket)
return syscall(SC_recvfd, socket);
}
int Emulator::virt$shbuf_create(int size, FlatPtr buffer)
{
u8* host_data = nullptr;
int shbuf_id = syscall(SC_shbuf_create, size, &host_data);
if (shbuf_id < 0)
return shbuf_id;
FlatPtr address = allocate_vm(size, PAGE_SIZE);
auto region = SharedBufferRegion::create_with_shbuf_id(address, size, shbuf_id, host_data);
m_mmu.add_region(move(region));
m_mmu.copy_to_vm(buffer, &address, sizeof(address));
return shbuf_id;
}
FlatPtr Emulator::virt$shbuf_get(int shbuf_id, FlatPtr size_ptr)
{
size_t host_size = 0;
void* host_data = (void*)syscall(SC_shbuf_get, shbuf_id, &host_size);
if (host_data == (void*)-1)
return (FlatPtr)host_data;
FlatPtr address = allocate_vm(host_size, PAGE_SIZE);
auto region = SharedBufferRegion::create_with_shbuf_id(address, host_size, shbuf_id, (u8*)host_data);
m_mmu.add_region(move(region));
m_mmu.copy_to_vm(size_ptr, &host_size, sizeof(host_size));
return address;
}
int Emulator::virt$shbuf_allow_pid(int shbuf_id, pid_t peer_pid)
{
auto* region = m_mmu.shbuf_region(shbuf_id);
ASSERT(region);
return region->allow_pid(peer_pid);
}
int Emulator::virt$shbuf_release(int shbuf_id)
{
auto* region = m_mmu.shbuf_region(shbuf_id);
ASSERT(region);
auto rc = region->release();
m_mmu.remove_region(*region);
return rc;
}
int Emulator::virt$profiling_enable(pid_t pid)
{
return syscall(SC_profiling_enable, pid);