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Kernel: Support userspace TTY graphics modesetting

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This is a copy of linux's KDSETMODE/KDGETMODE console ioctl(2)
interface.
This commit is contained in:
Peter Elliott 2022-04-28 01:17:32 -06:00 • committed by Andreas Kling
parent bc4a0baa8f
commit 4b0be17c71
4 changed files with 28 additions and 2 deletions
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13
Kernel/TTY/TTY.cpp
View file

@ -562,6 +562,19 @@ ErrorOr<void> TTY::ioctl(OpenFileDescription&, unsigned request, Userspace<void*
case TIOCNOTTY:
current_process.set_tty(nullptr);
return {};
case KDSETMODE: {
auto mode = static_cast<unsigned int>(arg.ptr());
if (mode != KD_TEXT && mode != KD_GRAPHICS)
return EINVAL;
set_graphical(mode == KD_GRAPHICS);
return {};
}
case KDGETMODE: {
auto mode_ptr = static_ptr_cast<int*>(arg);
int mode = (is_graphical()) ? KD_GRAPHICS : KD_TEXT;
return copy_to_user(mode_ptr, &mode);
}
}
return EINVAL;
}

3
Kernel/TTY/TTY.h
View file

@ -48,6 +48,9 @@ public:
virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_name() const = 0;
virtual bool is_graphical() const { return false; }
virtual void set_graphical(bool) { }
protected:
virtual ErrorOr<size_t> on_tty_write(UserOrKernelBuffer const&, size_t) = 0;
void set_size(unsigned short columns, unsigned short rows);

5
Kernel/TTY/VirtualConsole.h
View file

@ -78,8 +78,9 @@ public:
void refresh_after_resolution_change();
bool is_graphical() { return m_graphical; }
void set_graphical(bool graphical);
// ^TTY
virtual bool is_graphical() const override { return m_graphical; }
virtual void set_graphical(bool graphical) override;
void emit_char(char);