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Add a basic thread scheduler. This should allow the kernel to schedule
threads according to the round robin algorithm.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add a basic kmalloc implementation. This allows the kernel to allocate
blocks smaller than a whole page.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add the mostly finished physical memory allocator and expose its
functions to the paging system.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add an implmentation of strcpy. This function is used in several places
in the kernel to copy strings between memory addresses.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Clean up everything in the i386 arch directory. This code has been in
dire need of refactoring for a long while. All the inline assembly
functions and the data structures related to the architecture should be
placed into their own header file. Now the scheduler can access
registers and ISRs without having to deal with arch-specific code.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Move the function that jumps to ring 3 to its own assembly file.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add a basic driver for the PS/2 keyboard. This driver just prints
whatever it receives back out to the framebuffer.
Signed-off-by: Danny Holman <dholman@gymli.org>
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The VMM should control the physical memory as well as paging. This
allows the VMM to grab frames as it sees fit.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Move all the architecture-specific initialization calls to this file.
This frees up the main function to initialize other parts of the kernel.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Move all the functions that control IRQ lines to the PIC driver. This
allows the IDT controller to handle only raw interrupts no matter where
they come from.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add functions to the syscall handlers that dump registers and stack in
case of catastrophic failure.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add a set of functions that control the programmable interrupt timer.
This will be used as the primary means of preemption on this
architecture.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Move all operations related to the x86 framebuffer into its own set of
files. This makes the TTY layer more architecture agnostic.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Make the serial driver behave more like a standard POSIX call. It should
have write and read functions that call architecture specific functions.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Remove an inline assembly instruction that was placed for debugging
purposes.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add a proper page control API. These functions allow the kernel to
directly map and unmap pages in the logical address space.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add a simple, bitmap-based physical memory management system.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add support for the multiboot specification. These files will allow the
kernel to read the multiboot header information as well as the provided
memory map.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Remove an unused local variable from tty_putchar. Instead, just cast the
signed char to unsigned as needed.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Replace individual function calls with a single switch-case structure
for system calls. The new function, handle_syscall, will construct and
call the interrupt without input from the programmer.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Finish implementing pic_eoi and similar. This allows standardized
communication with the x86 PIC chip.
Signed-off-by: Danny Holman <dholman@gymli.org>
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The serial_writestring function is small enough and platform-agnostic,
and therefore it should be moved into the main serial header and marked
as inline.
Signed-off-by: Danny Holman <dholman@gymli.org>
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The x86 system call/interrupt handlers should be refactored to be more
readable.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Move all files not needed for the bootstrap process out of boot and into
the main x86 source directory.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add support for the 8259 programmable interrupt controller.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Add structure to the internals of the x86 directory.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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