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Create a generic interface for drivers to make use of interrupt vectors.
This API should be platform-agnostic enough to allow any driver to make
use of virtually any interrupt vector on any CPU. On x86, the first 32
interrupts are set aside for CPU exceptions, and interrupt 128 is set
aside for system calls.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add a function that generates and prints a stack trace to the screen.
This function relies on walk_stack() being implemented on the target
architecture.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Implement a basic round-robin scheduler and tie it to the PIT timer
interrupt on x86.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Refactor the physical memory manager to be dramatically simpler. The new
design uses only a single freelist, and only uses temporary mappings
where needed.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Create a subset of the C library for use inside the kernel.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add a flag that is set to 1 when the scheduler_init function is called.
This allows the PIT interrupt to preempt the current thread and schedule
the next one according to the scheduler's internal agorithm.
Signed-off-by: Danny Holman <dholman@gymli.org>
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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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Add a static variable to the panic function that should lock all other
CPUs.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Strip the code calling for the memory manager to allocate pages to
kmalloc. The function should just return a raw pointer while a page
fault will allocate the required memory.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add a panic function that stops the current CPU and prints an error
message into the ring buffer.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add more functions to the string library to process buffers and strings.
Signed-off-by: Danny Holman <dholman@gymli.org>
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The function kprintf should print to an internal ringbuffer instead of
directly to the framebuffer. This reduces dependence on the existence of
a framebuffer in the first place.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add a simple implementation of kmalloc. This system only works on
x86-based processors at the time of commit.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Create files that add IDT support for i386.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Add a set of routines that setup the x86's global descriptor table.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Add a 'k' prefix to the kernel versions of the printf family.
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Add a function in the serial interface that writes an entire string to
the serial line.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Iterate over a formatted string with an index and strlen instead of
using a non-const pointer. The latter method may result in unsafe memory
conditions.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Keep const pointers const when casting from void to char.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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The function serial_init should not be declared as static. This function
could change under a different architecture and should be defined with
the target architecture.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Add support for serial communication in the i386 architecture.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Finish implementing the functions from string.h in string.c.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Implement a basic printf function using primitives from the TTY library.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Add the main initialiazation functions within the main kernel directory.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Add implementations for functions declared in string.h.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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