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Kernel: Implement a naive version of virtconsole by memcpying to physical page

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This patch allocates a physical page for each of the virtqueues and
memcpys to it when receiving a buffer to get a physical, aligned
contiguous buffer as required by the virtio specification.

Co-authored-by: Sahan <sahan.h.fernando@gmail.com>
This commit is contained in:
Idan Horowitz 2021-04-15 19:22:02 +10:00 • committed by Andreas Kling
parent 42b1eb5af1
commit ecfa7cb824
8 changed files with 35 additions and 18 deletions
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5
Kernel/VirtIO/VirtIOQueue.h
View file

@ -26,6 +26,7 @@
#pragma once
#include <AK/Badge.h>
#include <Kernel/SpinLock.h>
#include <Kernel/VM/MemoryManager.h>
@ -36,6 +37,8 @@ enum class BufferType {
DeviceWritable = 2
};
class VirtIODevice;
class VirtIOQueue {
public:
VirtIOQueue(u16 queue_size, u16 notify_offset);
@ -51,7 +54,7 @@ public:
PhysicalAddress driver_area() const { return to_physical(m_driver.ptr()); }
PhysicalAddress device_area() const { return to_physical(m_device.ptr()); }
bool supply_buffer(const u8* buffer, u32 len, BufferType);
bool supply_buffer(Badge<VirtIODevice>, const u8* buffer, u32 length, BufferType);
bool new_data_available() const;
bool handle_interrupt();