mirror of
https://github.com/qemu/qemu.git
synced 2024-12-01 07:43:35 +08:00
0791bc02b8
Add a system controller for the m68k-virt machine. This controller allows the kernel to power off or reset the machine. Signed-off-by: Laurent Vivier <laurent@vivier.eu> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20210312214145.2936082-5-laurent@vivier.eu>
27 lines
957 B
Plaintext
27 lines
957 B
Plaintext
Virtual System Controller
|
|
=========================
|
|
|
|
This device is a simple interface defined for the pure virtual machine with no
|
|
hardware reference implementation to allow the guest kernel to send command
|
|
to the host hypervisor.
|
|
|
|
The specification can evolve, the current state is defined as below.
|
|
|
|
This is a MMIO mapped device using 256 bytes.
|
|
|
|
Two 32bit registers are defined:
|
|
|
|
1- the features register (read-only, address 0x00)
|
|
|
|
This register allows the device to report features supported by the
|
|
controller.
|
|
The only feature supported for the moment is power control (0x01).
|
|
|
|
2- the command register (write-only, address 0x04)
|
|
|
|
This register allows the kernel to send the commands to the hypervisor.
|
|
The implemented commands are part of the power control feature and
|
|
are reset (1), halt (2) and panic (3).
|
|
A basic command, no-op (0), is always present and can be used to test the
|
|
register access. This command has no effect.
|