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Add mechanism to expose kernel variables to userspace via ProcFS.

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Only booleans are supported at first. More types can be added easily.
Use this to add /proc/sys/wm_flash_flush which when enabled flashes pending
screen flush rects in yellow before they happen.
This commit is contained in:
Andreas Kling 2019-01-18 15:01:40 +01:00
parent 9454c5dd52
commit f7cc454162
8 changed files with 121 additions and 29 deletions
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78
Kernel/ProcFileSystem.cpp
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@ -156,15 +156,15 @@ void ProcFS::add_process(Process& process)
ksprintf(buf, "%d", process.pid());
auto dir = add_file(create_directory(buf));
m_pid2inode.set(process.pid(), dir.index());
add_file(create_generated_file("vm", [&process] { return procfs$pid_vm(process); }), dir.index());
add_file(create_generated_file("vmo", [&process] { return procfs$pid_vmo(process); }), dir.index());
add_file(create_generated_file("stack", [&process] { return procfs$pid_stack(process); }), dir.index());
add_file(create_generated_file("regs", [&process] { return procfs$pid_regs(process); }), dir.index());
add_file(create_generated_file("fds", [&process] { return procfs$pid_fds(process); }), dir.index());
add_file(create_generated_file("vm", [&process] (SynthFSInode&) { return procfs$pid_vm(process); }), dir.index());
add_file(create_generated_file("vmo", [&process] (SynthFSInode&) { return procfs$pid_vmo(process); }), dir.index());
add_file(create_generated_file("stack", [&process] (SynthFSInode&) { return procfs$pid_stack(process); }), dir.index());
add_file(create_generated_file("regs", [&process] (SynthFSInode&) { return procfs$pid_regs(process); }), dir.index());
add_file(create_generated_file("fds", [&process] (SynthFSInode&) { return procfs$pid_fds(process); }), dir.index());
if (process.executable_inode())
add_file(create_generated_file("exe", [&process] { return procfs$pid_exe(process); }, 00120777), dir.index());
add_file(create_generated_file("exe", [&process] (SynthFSInode&) { return procfs$pid_exe(process); }, 00120777), dir.index());
if (process.cwd_inode())
add_file(create_generated_file("cwd", [&process] { return procfs$pid_cwd(process); }, 00120777), dir.index());
add_file(create_generated_file("cwd", [&process] (SynthFSInode&) { return procfs$pid_cwd(process); }, 00120777), dir.index());
}
void ProcFS::remove_process(Process& process)
@ -179,7 +179,7 @@ void ProcFS::remove_process(Process& process)
m_pid2inode.remove(pid);
}
ByteBuffer procfs$mm()
ByteBuffer procfs$mm(SynthFSInode&)
{
// FIXME: Implement
InterruptDisabler disabler;
@ -198,7 +198,7 @@ ByteBuffer procfs$mm()
return builder.to_byte_buffer();
}
ByteBuffer procfs$mounts()
ByteBuffer procfs$mounts(SynthFSInode&)
{
InterruptDisabler disabler;
StringBuilder builder;
@ -213,7 +213,7 @@ ByteBuffer procfs$mounts()
return builder.to_byte_buffer();
}
ByteBuffer procfs$cpuinfo()
ByteBuffer procfs$cpuinfo(SynthFSInode&)
{
StringBuilder builder;
{
@ -276,7 +276,7 @@ ByteBuffer procfs$cpuinfo()
return builder.to_byte_buffer();
}
ByteBuffer procfs$kmalloc()
ByteBuffer procfs$kmalloc(SynthFSInode&)
{
StringBuilder builder;
builder.appendf(
@ -290,7 +290,7 @@ ByteBuffer procfs$kmalloc()
return builder.to_byte_buffer();
}
ByteBuffer procfs$summary()
ByteBuffer procfs$summary(SynthFSInode&)
{
InterruptDisabler disabler;
auto processes = Process::allProcesses();
@ -313,7 +313,7 @@ ByteBuffer procfs$summary()
return builder.to_byte_buffer();
}
ByteBuffer procfs$inodes()
ByteBuffer procfs$inodes(SynthFSInode&)
{
extern HashTable<Inode*>& all_inodes();
auto& vfs = VFS::the();
@ -326,6 +326,57 @@ ByteBuffer procfs$inodes()
return builder.to_byte_buffer();
}
struct SysVariableData final : public SynthFSInodeCustomData {
virtual ~SysVariableData() override { }
enum Type {
Invalid,
Boolean,
};
Type type { Invalid };
Function<void()> change_callback;
void* address;
};
static ByteBuffer read_sys_bool(SynthFSInode& inode)
{
ASSERT(inode.custom_data());
auto buffer = ByteBuffer::create_uninitialized(2);
auto& custom_data = *static_cast<const SysVariableData*>(inode.custom_data());
ASSERT(custom_data.type == SysVariableData::Boolean);
ASSERT(custom_data.address);
buffer[0] = *reinterpret_cast<bool*>(custom_data.address) ? '1' : '0';
buffer[1] = '\n';
return buffer;
}
static ssize_t write_sys_bool(SynthFSInode& inode, const ByteBuffer& data)
{
ASSERT(inode.custom_data());
if (data.size() >= 1 && (data[0] == '0' || data[0] == '1')) {
auto& custom_data = *static_cast<const SysVariableData*>(inode.custom_data());
ASSERT(custom_data.address);
bool old_value = *reinterpret_cast<bool*>(custom_data.address);
bool new_value = data[0] == '1';
*reinterpret_cast<bool*>(custom_data.address) = new_value;
if (old_value != new_value && custom_data.change_callback)
custom_data.change_callback();
}
return data.size();
}
void ProcFS::add_sys_bool(String&& name, bool* var, Function<void()>&& change_callback)
{
auto file = create_generated_file(move(name), move(read_sys_bool), move(write_sys_bool));
auto data = make<SysVariableData>();
data->type = SysVariableData::Boolean;
data->change_callback = move(change_callback);
data->address = var;
file->set_custom_data(move(data));
InterruptDisabler disabler;
add_file(move(file), m_sys_dir.index());
}
bool ProcFS::initialize()
{
SynthFS::initialize();
@ -335,6 +386,7 @@ bool ProcFS::initialize()
add_file(create_generated_file("summary", procfs$summary));
add_file(create_generated_file("cpuinfo", procfs$cpuinfo));
add_file(create_generated_file("inodes", procfs$inodes));
m_sys_dir = add_file(create_directory("sys"));
return true;
}