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28 * Authors: Nathan Binkert
32 * System Console Backdoor Interface
35 #ifndef __DEV_ALPHA_BACKDOOR_HH__
36 #define __DEV_ALPHA_BACKDOOR_HH__
38 #include "base/range.hh"
39 #include "base/types.hh"
40 #include "dev/alpha/access.h"
41 #include "dev/io_device.hh"
42 #include "params/AlphaBackdoor.hh"
43 #include "sim/sim_object.hh"
51 * Memory mapped interface to the system console. This device
52 * represents a shared data region between the OS Kernel and the
53 * System Console Backdoor.
55 * The system console is a small standalone program that is initially
56 * run when the system boots. It contains the necessary code to
57 * access the boot disk, to read/write from the console, and to pass
58 * boot parameters to the kernel.
60 * This version of the system console is very different from the one
61 * that would be found in a real system. Many of the functions use
62 * some sort of backdoor to get their job done. For example, reading
63 * from the boot device on a real system would require a minimal
64 * device driver to access the disk controller, but since we have a
65 * simulator here, we are able to bypass the disk controller and
66 * access the disk image directly. There are also some things like
67 * reading the kernel off the disk image into memory that are normally
68 * taken care of by the console that are now taken care of by the
71 * These shortcuts are acceptable since the system console is
72 * primarily used doing boot before the kernel has loaded its device
75 class AlphaBackdoor : public BasicPioDevice
78 struct Access : public AlphaAccess
80 void serialize(std::ostream &os);
81 void unserialize(Checkpoint *cp, const std::string §ion);
89 /** the disk must be accessed from the console */
92 /** the system console (the terminal) is accessable from the console */
95 /** a pointer to the system we are running in */
98 /** a pointer to the CPU boot cpu */
102 typedef AlphaBackdoorParams Params;
103 AlphaBackdoor(const Params *p);
108 return dynamic_cast<const Params *>(_params);
111 virtual void startup();
114 * memory mapped reads and writes
116 virtual Tick read(PacketPtr pkt);
117 virtual Tick write(PacketPtr pkt);
120 * standard serialization routines for checkpointing
122 virtual void serialize(std::ostream &os);
123 virtual void unserialize(Checkpoint *cp, const std::string §ion);
126 #endif // __DEV_ALPHA_BACKDOOR_HH__