arch: i386: move non-critial files out of boot

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>

3 files changed, 197 insertions, 0 deletions

diff --git a/arch/i386/kernel/pic.c b/arch/i386/kernel/pic.c
new file mode 100644
index 0000000..69a0785
--- /dev/null
+++ b/arch/i386/kernel/pic.c
@@ -0,0 +1,67 @@
+#include <kernel/pic.h>
+
+void pic_eoi(unsigned char irq) {
+        if (irq >= 8)
+                outb(PIC2_COMMAND, 0x20);
+        outb(PIC1_COMMAND, 0x20);
+}
+
+void pic_remap(void) {
+        unsigned char a1 = inb(PIC1_DATA);
+        unsigned char a2 = inb(PIC2_DATA);
+
+        outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4);
+        outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4);
+        outb(PIC1_DATA, PIC1);
+        outb(PIC2_DATA, PIC2);
+        outb(PIC1_DATA, 4);
+        outb(PIC2_DATA, 2);
+        outb(PIC1_DATA, ICW4_8086);
+        outb(PIC2_DATA, ICW4_8086);
+        outb(PIC1_DATA, a1);
+        outb(PIC2_DATA, a2);
+}
+
+static uint16_t __pic_get_irq_reg(int ocw3) {
+        outb(PIC1_COMMAND, ocw3);
+        outb(PIC2_COMMAND, ocw3);
+        return (inb(PIC2_COMMAND) << 8) | inb(PIC1_COMMAND);
+}
+
+uint16_t pic_get_irr(void) {
+        return __pic_get_irq_reg(PIC_READ_IRR);
+}
+
+uint16_t pic_get_isr(void) {
+        return __pic_get_irq_reg(PIC_READ_ISR);
+}
+
+void irq_set_mask(uint8_t irq) {
+        uint16_t port;
+        uint8_t data;
+
+        if (irq < 8) {
+                port = PIC1_DATA;
+        } else {
+                port = PIC2_DATA;
+                irq -= 8;
+        }
+
+        data = inb(port) | (1 << irq);
+        outb(port, data);
+}
+
+void irq_clear_mask(uint8_t irq) {
+        uint16_t port;
+        uint8_t data;
+
+        if (irq < 8) {
+                port = PIC1_DATA;
+        } else {
+                port = PIC2_DATA;
+                irq -= 8;
+        }
+
+        data = inb(port) & ~(1 << irq);
+        outb(port, data);
+}
diff --git a/arch/i386/kernel/syscall.c b/arch/i386/kernel/syscall.c
new file mode 100644
index 0000000..570f0de
--- /dev/null
+++ b/arch/i386/kernel/syscall.c
@@ -0,0 +1,42 @@
+#include <kernel/syscall.h>
+#include <kernel/io.h>
+#include <stddef.h>
+
+void *(*syscall_handlers[30])(struct isr_frame *frame);
+
+void syscall_dispatch(struct isr_frame *frame) {
+        if (syscall_handlers[frame->eax] != NULL)
+                syscall_handlers[frame->eax](frame);
+        else
+                kprintf("Error: Invalid system call number: %d\n", frame->eax);
+        __asm__ volatile("cli;hlt");
+}
+
+void register_syscall(void *handler(struct isr_frame*), int num) {
+        syscall_handlers[num] = handler;
+}
+
+void sys_stop(struct isr_frame *frame) {
+        kprintf("SYSTEM CALL: STOP\n");
+        halt_catch_fire(frame);
+}
+
+void sys_status(struct isr_frame *frame) {
+        kprintf("SYSTEM CALL: STATUS\n");
+        dump_reg(frame);
+}
+
+void dump_reg(struct isr_frame *frame) {
+        kprintf("Registers at interrupt:\n");
+        kprintf("\tEAX = %x\n", frame->eax);
+        kprintf("\tEBX = %x\n", frame->ebx);
+        kprintf("\tECX = %x\n", frame->ecx);
+        kprintf("\tEDX = %x\n", frame->edx);
+        kprintf("\tESI = %x\n", frame->esi);
+        kprintf("\tEDI = %x\n", frame->edi);
+        kprintf("\tESP = %x\n", frame->esp);
+        kprintf("\tEBP = %x\n", frame->ebp);
+        kprintf("\tEIP = %x\n", frame->eip);
+        kprintf("\tEFLAGS = %x\n", frame->eflags);
+        kprintf("Current code selector: %d\n", frame->cs);
+}
diff --git a/arch/i386/kernel/tty.c b/arch/i386/kernel/tty.c
new file mode 100644
index 0000000..f929408
--- /dev/null
+++ b/arch/i386/kernel/tty.c
@@ -0,0 +1,88 @@
+#include <kernel/vga.h>
+#include <kernel/tty.h>
+#include <kernel/string.h>
+#include <stddef.h>
+#include <stdint.h>
+
+static const size_t VGA_WIDTH = 80;
+static const size_t VGA_HEIGHT = 25;
+//static uint16_t *const VGA_MEMORY = (uint16_t*)0xC03FF000;
+static uint16_t *const VGA_MEMORY = (uint16_t*)0xB8000;
+
+static size_t terminal_row;
+static size_t terminal_column;
+static uint8_t terminal_color;
+static uint16_t *terminal_buffer;
+
+void tty_init(void) {
+        terminal_row = 0;
+        terminal_column = 0;
+        terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
+        terminal_buffer = VGA_MEMORY;
+        for (size_t y = 0; y < VGA_HEIGHT; y++) {
+                for (size_t x = 0; x < VGA_WIDTH; x++) {
+                        const size_t index = y * VGA_WIDTH + x;
+                        terminal_buffer[index] = vga_entry(' ', terminal_color);
+                }
+        }
+}
+
+void tty_setcolor(uint8_t color) {
+        terminal_color = color;
+}
+
+void tty_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) {
+        const size_t index = y * VGA_WIDTH + x;
+        terminal_buffer[index] = vga_entry(c, color);
+}
+
+void terminal_scroll(void) {
+        for (size_t i = 0; i < VGA_HEIGHT; i++) {
+                for (size_t j = 0; j < VGA_WIDTH; j++)
+                        terminal_buffer[i * VGA_WIDTH + j] = terminal_buffer[(i+1) * VGA_WIDTH + j];
+        }
+}
+
+void tty_putchar(char c) {
+        unsigned char uc;
+
+        uc = c;
+        switch (uc) {
+                case '\n':
+                        terminal_column = 0;
+                        if (++terminal_row == VGA_HEIGHT) {
+                                terminal_row--;
+                                terminal_scroll();
+                        }
+                        break;
+                case '\t':
+                        terminal_column += 4;
+                        if (++terminal_column == VGA_WIDTH) {
+                                terminal_column = 4;
+                                if (++terminal_row == VGA_HEIGHT) {
+                                        terminal_row--;
+                                        terminal_scroll();
+                                }
+                        }
+                        break;
+                default:
+                        tty_putentryat(uc, terminal_color, terminal_column, terminal_row);
+                        if (++terminal_column == VGA_WIDTH) {
+                                terminal_column = 0;
+                                if (++terminal_row == VGA_HEIGHT) {
+                                        terminal_row--;
+                                        terminal_scroll();
+                                }
+                        }
+                        break;
+        }
+}
+
+void tty_write(const char *data, size_t size) {
+        for (size_t i = 0; i < size; i++)
+                tty_putchar(data[i]);
+}
+
+void tty_writestring(const char *data) {
+        tty_write(data, strlen(data));
+}