From 8cd22309667cf3da9c357e5b7dca43e8b6a2f9c0 Mon Sep 17 00:00:00 2001 From: Danny Holman Date: Fri, 21 Jan 2022 12:10:05 -0600 Subject: 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 --- arch/i386/kernel/pic.c | 67 +++++++++++++++++++++++++++++++++++ arch/i386/kernel/syscall.c | 42 ++++++++++++++++++++++ arch/i386/kernel/tty.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 197 insertions(+) create mode 100644 arch/i386/kernel/pic.c create mode 100644 arch/i386/kernel/syscall.c create mode 100644 arch/i386/kernel/tty.c (limited to 'arch/i386/kernel') 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 + +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 +#include +#include + +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 +#include +#include +#include +#include + +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)); +} -- cgit v1.2.3