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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 new source files to the x86 architecture build configuration.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add references to the PMM bitmap to the linker script.
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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Define a few standard Unix system calls. These may change based on
future needs.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Make the register_irq_function accessible from files including pic.h.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Make all variables with char or char* type into uint8_t. This makes the
system more consistent and issues fewer compiler warnings.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Remove references to extern functions. All the necessary functionality
for this file is already contained.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Create the ISR stubs for use by IRQ handlers.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Actually install the ISR handlers to the IDT.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Remove the irq number from the irq handler. This information is already
stored in the ISR frame structure.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Call the page fault handler when a page fault occurs instead of just
dumping the registers and halting.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add a infinite while loop just in case the "hlt" instruction fails.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Remove several preprocessor macros that serve no purpose and pollute the
source file.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Perform some initialization routines on the TSS structure before loading
its address.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Define the load_page_dir and enable_paging functions in assembly. This
allows normal C code to initialize the CR3 register and control paging
without using inline assembler.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Move the initial C entry-point to its own file. Call all the i386
specific initialization routines from the new i386_entry function.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Fix several small bugs in assembler.
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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Make the inline assembly calls consistent across different i386 files.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add support for rudementary system calls and IRQ interrupts.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Simplify the setup and definitions of GDT/TSS entries.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Simplify the interrupt descriptor table setup and frame assembly.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Add support for the tab character in the virtual terminal.
Signed-off-by: Danny Holman <dholman@gymli.org>
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Rename the array/pointer to the GDT array in gdt.c pointer to be a bit
clearer.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Include information about the current stack frame in the IDT handler(s).
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Add functions that let the OS read the internal state registers of the
8259 PIC.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Fix the i386's general exception handler to actually work. Fix provided
by Jon Sanderson (jjs295356@gmail.com).
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Fix a bug in which the size of the main GDT array and the actual number
of descriptors are different values.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Add support for the 8259 programmable interrupt controller.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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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 two ring-3 segment discriptors to the GDT during gdt_install.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Add parenthesis around the GDT setup macros. This is done to prevent
having to do it when using them.
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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Move the start of the kernel image to the "higher half" of memory. This
also enables paging.
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Fix a bug in which the architecture specific include directories are not
properly included in the main Makefile.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Add support for scrolling the terminal at the end of the VGA buffer.
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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Add support for the newline character in the TTY layer.
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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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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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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