2023-10-13 07:30:58 +00:00
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/*
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Nagłówek Multiboot
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*/
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/* Moduły bootujące jak i sam kernel zostanie załaodwany z wyrównaniem do 4 KB
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* stron */
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.set ALIGN, 1<<0
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/* Kernelowi zostaną udostępnione informacje o pamięci, które zdobył
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* bootloader. Opcjonalnie nawet mapa pamięci */
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.set MEMINFO, 1<<1
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/* Połączenie flag */
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.set FLAGS, ALIGN | MEMINFO
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/* Wartość magicznego numerka dla Multiboot 1 */
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.set MAGIC, 0x1BADB002
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/* Suma kontrola, która w sumie z flagami i numerkiem ma dać 0, czyli należy
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* podać ich odwrotność. */
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.set CHECKSUM, -(MAGIC + FLAGS)
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/* Faktyczny nagłówek multiboot z wykorzystaniem powyższych wartości */
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.section .multiboot
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.align 4
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.long MAGIC
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.long FLAGS
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.long CHECKSUM
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/*
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Alokacja stosu
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*/
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.section .bss
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.align 16
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2023-11-03 13:13:33 +00:00
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.global stack_top
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.global stack_bottom
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2023-10-13 07:30:58 +00:00
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stack_bottom:
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/* Stos o wielkości 16 KB */
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2023-11-23 13:21:09 +00:00
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.skip 65536
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2023-10-13 07:30:58 +00:00
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stack_top:
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2023-10-20 22:22:14 +00:00
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.section .data
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2023-11-23 13:21:09 +00:00
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int_count: .int 0x0
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clock_count: .int 0x0
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clock_pos: .int 0x0
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2023-10-20 22:22:14 +00:00
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2023-10-13 07:30:58 +00:00
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/*
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Oznaczenie startu, tu zaczyna się kod kernela!
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*/
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.section .text
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2023-11-23 13:21:09 +00:00
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.global default_isr
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.type default_isr, @function
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default_isr:
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cli
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push %eax
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mov $0x0F41, %eax
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add int_count, %eax
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mov %ax, 0xb8000
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incl int_count
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cmpl $0x5, int_count
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jne end
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movl $0x0, int_count
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end:
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xchg %bx, %bx
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mov $0x20, %al
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outb %al, $0x20
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mov $0x20, %al
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outb %al, $0xA0
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pop %eax
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sti
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iretl
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.global clock_isr
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.type clock_isr, @function
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clock_isr:
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cli
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push %eax
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//xchg %bx, %bx
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mov $0x0F41, %ax
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add clock_count, %ax
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mov clock_pos, %edx
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shl $1, %edx
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add $0xb8002, %edx
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movw %ax, (%edx)
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incl clock_count
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cmpl $0x1F, clock_count
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jne end2
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movl $0x0, clock_count
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end2:
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incl clock_pos
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cmpl $0x7CF, clock_pos
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jne end3
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movl $0x0, clock_pos
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end3:
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//xchg %bx, %bx
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mov $0x0c, %al
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outb %al, $0x70
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inb $0x71
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mov $0x20, %al
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outb %al, $0x20
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mov $0x20, %al
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outb %al, $0xA0
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// EOI
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pop %eax
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sti
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iretl
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2023-10-13 07:30:58 +00:00
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.global _start
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.type _start, @function
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_start:
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/* Ustawienie ESP na wierzchołek stosu */
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mov $stack_top, %esp
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/* Wywołanie kernela */
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call kernel_main
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/* Wieczne oczekiwanie po zakończeniu kodu kernela */
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2023-11-23 13:21:09 +00:00
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// cli
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2023-10-13 07:30:58 +00:00
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1: hlt
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/* Skacze do (lokalnej) labelki o nazwie 1, wstecz */
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jmp 1b
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/* Ustawienie wielkości funkcji start, co pozwala uniknąć błędów z
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* debuggowaniem */
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.size _start, . - _start
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