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If multiple processes try to write to the console, a race condition
of sorts may occur. Similarly, if multiple processes try to read from the
console and contend with the console input buffer. One process may steal
keys from the other. Prevent this by implementing a mutex within the
console descriptor. Each time a process reads or writes the console, it
attaches itself. Any other processes attempting to read or write the
console while another is attached will be yielded to the scheduler
until the resource is free.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Add mutex locks, these differ from spinlocks as they are named and also
yield to the scheduler instead of just spinning if the lock is acquired.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Sometimes one may not want *all* of the drivers to start up during
system boot. The driver blacklist allows one to mark a driver to be
ignored during startup.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Assign a name to each driver through the DRIVER_EXPORT() or
DRIVER_DEFER() macros. This can be used for blacklisting driver
startups.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Introduce a 'board_info' structure as well as an md_get_board() routine
to get information about the host
Signed-off-by: Ian Moffett <ian@osmora.org>
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Add 'show_curs' feat flag to enable/disable whether or not the cursor
should be drawn
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Introduce a ctlfs entry for configuring various console features such as
the ability to parse ANSI escape codes.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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This commit cleans up the read routine by creating a helper that fetches
common fields from the ctlfs entry while checking things such as its
magic number.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Introduce a 'feat' field in the cons_screen structure to allow certain
console features to be turned on or off.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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The 'len' field within the tmpfs node stores the buffer length which is
relative to the tmpfs block size. Introduce a real size which returns
the amount of data actually present within those buffers.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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The SYS_inject syscall will allow the user to inject Kernel Runtime Quantums
(KRQs) into the running kernel. As of now, set paths are not supported and the
initial implementation includes a NULL path used to load all deferrable drivers.
Previously during kernel startup, all deferrable drivers were loaded
automatically. This commit makes it so that they are only loaded when
sys_inject() is called with a NULL path.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Clear the screen and tweak console foreground/background to urgent
looking colors during a system panic
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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- Rename regdump() to trap_fatal()
- Use panic() rather than kprintf()
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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This commit introduces the global libc '__libc_auxv' containing
auxiliary vector entries as per the System V Application Binary
Interface
Signed-off-by: Ian Moffett <ian@osmora.org>
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Implement logic to go through the section header table and explicitly
zero fill all entries of type SHT_NOBITS
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Having the same amount of idle threads per core allow the CPU to always
have a thread assigned to one of its cores even when there are currently
no other threads for it to take.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Ensure file I/O operations match the seal that their respective file
descriptors were set with.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Introduce the initial support for tmpfs, a readable and writable in-memory
filesystem.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Add support for the O_CREAT flag which allows file creation upon an
open() call.
Signed-off-by: Ian Moffett <ian@osmora.org>
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In some lookup cases, we may only be interested in the parent component.
For example, the parent of "/foo/bar/mrow" is "/foo/bar/". The NAMEI_WANTPARENT
asks namei to only look for the parent rather than the full path.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Remove logic to reboot machine by simply pressing a key.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Implement logic to update the date returned by the MC1468XX/RTC chip.
This can be used to later implement some sort of time synchronization
protocol or manual setting of the date.
Signed-off-by: Ian Moffett <ian@osmora.org>
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The year register of the RTC does not keep track of the century so
default to 2000 until we figure out the non-standard century register.
Signed-off-by: Ian Moffett <ian@osmora.org>
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On certain embedded controllers (ECs) like the EC present on the
Thinkpad T420s, writes to the i8042 controller configuration byte
are not very liked by the EC internal logic and thus result in them
asserting an NMI as a certain host bus error. To workaround this, Hyra
falls back to polling on these specific devices. Previously, Hyra did not
have DMI/SMBIOS capabilities and therefore had to rely on assuming *all*
Lenovo devices were "hostile". As of now since we are capable grabbing
the product version from DMI, we can target specific devices like the
T420s and this commit provides that logic.
This commit additionally implements logic to enable interrupts on PS/2
port 0 (aka the keyboard).
Signed-off-by: Ian Moffett <ian@osmora.org>
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Before the Hyra kernel starts up, the Limine bootloader creates a
mapping of the first 4 GiB of memory (identity mapped for base revisions
of zero and mapped to the HDDM on higher base revisions). However, it
usually will create a huge mapping over this which would be problematic
during remaps of device MMIO base addresses as they typically reside at
the 4 GiB region of RAM and as of this commit, huge pages are not a
supported feature of the Hyra AMD64 pmap layer.
Signed-off-by: Ian Moffett <ian@osmora.org>
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The function md_td_kick() is only used for user threads and there is no
need reference any kernel segments. Furthermore, the previous code would
introduce a bug where rpl would always be 0.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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