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Kernel: Harvest randomness from various drivers

Random now gets entropy from the following drivers:
- KeyboardDevice
- PATAChannel
- PS2MouseDevice
- E1000NetworkAdapter
- RTL8139NetworkAdapter

Of these devices,  PS2MouseDevice and PATAChannel provide the vast
majority of the entropy.
This commit is contained in:
Peter Elliott 2020-06-24 14:07:28 -06:00 committed by Andreas Kling
parent 2e8cfe5435
commit af0b2d1d86
12 changed files with 71 additions and 7 deletions

View file

@ -204,6 +204,9 @@ void E1000NetworkAdapter::handle_irq(const RegisterState&)
out32(REG_INTERRUPT_MASK_CLEAR, 0xffffffff);
u32 status = in32(REG_INTERRUPT_CAUSE_READ);
m_entropy_source.add_random_event(status);
if (status & 4) {
u32 flags = in32(REG_CTRL);
out32(REG_CTRL, flags | ECTRL_SLU);

View file

@ -28,11 +28,12 @@
#include <AK/NonnullOwnPtrVector.h>
#include <AK/OwnPtr.h>
#include <Kernel/IO.h>
#include <Kernel/Interrupts/IRQHandler.h>
#include <Kernel/Net/NetworkAdapter.h>
#include <Kernel/PCI/Access.h>
#include <Kernel/PCI/Device.h>
#include <Kernel/IO.h>
#include <Kernel/Random.h>
namespace Kernel {
@ -103,6 +104,7 @@ private:
u8 m_interrupt_line { 0 };
bool m_has_eeprom { false };
bool m_use_mmio { false };
EntropySource m_entropy_source;
static const size_t number_of_rx_descriptors = 32;
static const size_t number_of_tx_descriptors = 8;

View file

@ -184,6 +184,8 @@ void RTL8139NetworkAdapter::handle_irq(const RegisterState&)
int status = in16(REG_ISR);
out16(REG_ISR, status);
m_entropy_source.add_random_event(status);
#ifdef RTL8139_DEBUG
klog() << "RTL8139NetworkAdapter::handle_irq status=0x" << String::format("%x", status);
#endif

View file

@ -27,10 +27,11 @@
#pragma once
#include <AK/OwnPtr.h>
#include <Kernel/IO.h>
#include <Kernel/Net/NetworkAdapter.h>
#include <Kernel/PCI/Access.h>
#include <Kernel/PCI/Device.h>
#include <Kernel/IO.h>
#include <Kernel/Random.h>
namespace Kernel {
@ -73,5 +74,6 @@ private:
u8 m_tx_next_buffer { 0 };
OwnPtr<Region> m_packet_buffer;
bool m_link_up { false };
EntropySource m_entropy_source;
};
}