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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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