mirror of
https://github.com/gbowne1/ClassicOS.git
synced 2024-11-21 05:46:52 -08:00
adding files as they are from deesix on my IRC via pastebin
This commit is contained in:
parent
f4f71fd3c2
commit
82e910ca86
45
boot.asm
45
boot.asm
@ -11,7 +11,7 @@ boot:
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mov [disk],dl
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mov ah, 0x2 ;read sectors
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mov al, 6 ;sectors to read
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mov al, 64 ;sectors to read
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mov ch, 0 ;cylinder idx
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mov dh, 0 ;head idx
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mov cl, 2 ;sector idx
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@ -30,22 +30,37 @@ boot:
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mov gs, ax
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mov ss, ax
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jmp CODE_SEG:boot2
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; access(8)
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; P:present(1) DPL:descriptor_privilege_level(2)
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; S:descriptor_type(1) E:executable(1) DC:direction/conforming(1)
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; RW:readable/writable(1) A:accessed(1)
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; flags(4)
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; G:granularity(1) DB:size(1) L:long_mode_code(1) Reserved(1)
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gdt_start:
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dq 0x0
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dq 0x0000000000000000 ; null descriptor
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gdt_code:
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dw 0xFFFF
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dw 0x0
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db 0x0
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db 10011010b
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db 11001111b
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db 0x0
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dw 0xFFFF ; limit_0_15(16)
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dw 0x0000 ; base_0_15(16)
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db 0x00 ; base_16_23(8)
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db 10011010b ; P(1)=1=present DPL(2)=00=ring0 S(1)=1=non_system E(1)=1=code
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; DC(1)=0=same_ring RW(1)=1=readable A(1)=0=not_accessed
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db 11001111b ; G(1)=1=page, DB(1)=1=32b, L(1)=0=non_64b Reserved(1)=0=_
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; limit_16_19(4)=1111
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db 0x00 ; base_24_31(8)
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gdt_data:
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dw 0xFFFF
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dw 0x0
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db 0x0
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db 10010010b
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db 11001111b
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db 0x0
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dw 0xFFFF ; limit_0_15(16)
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dw 0x0000 ; base_0_15(16)
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db 0x00 ; base_16_23(8)
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db 10010010b ; P(1)=1=present DPL(2)=00=ring0 S(1)=1=non_system E(1)=0=data
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; DC(1)=0=grows_up RW(1)=1=rw A(1)=0=not_accessed
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db 11001111b ; G(1)=1=page DB(1)=1=32b_sp L(1)=0=_ Reserved(1)=0=_
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; limit_16_19(4)=1111
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db 0x00 ; base_24_31(8)
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gdt_end:
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gdt_pointer:
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dw gdt_end - gdt_start
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@ -82,4 +97,4 @@ section .bss
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align 4
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kernel_stack_bottom: equ $
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resb 16384 ; 16 KB
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kernel_stack_top:
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kernel_stack_top:
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29
do.sh
Normal file
29
do.sh
Normal file
@ -0,0 +1,29 @@
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#!/bin/sh
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set -e
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# TODO: Check the compiler does x86
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if [ "$1" = "build" ]; then
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shift
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printf "Assembling bootloader...\n"
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nasm -f elf32 boot.asm -o boot.o
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printf "Compiling...\n"
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gcc \
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-save-temps \
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-std=c99 -m32 \
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-fno-pic \
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-mgeneral-regs-only \
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-ffreestanding -nostdlib \
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-Wall -Wextra -Wpedantic \
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kernel.c boot.o \
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-o kernel.bin \
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-T linker.ld
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fi
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if [ "$1" = "boot" ]; then
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printf "Booting...\n\n"
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MACHINE="-machine pc -cpu 486"
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qemu-system-i386 $MACHINE -net none -serial stdio -drive file=kernel.bin,index=0,if=floppy,format=raw
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fi
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487
kernel.c
487
kernel.c
@ -1,13 +1,488 @@
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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bool terminate = false;
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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static inline void outb(uint16_t port, uint8_t val)
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{
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__asm__ volatile ("outb %b0, %w1" : : "a"(val), "Nd"(port) : "memory");
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}
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static inline uint8_t inb(uint16_t port)
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{
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uint8_t ret;
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__asm__ volatile ("inb %w1, %b0" : "=a"(ret) : "Nd"(port) : "memory");
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return ret;
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}
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static inline void io_wait(void)
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{
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outb(0x80, 0);
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}
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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#define PORT 0x3f8 // COM1
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void init_serial(void)
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{
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// Enable "data available" interrupt.
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outb(PORT + 1, 0x01);
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}
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// Use only when there _is_ something to read.
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char read_serial()
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{
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return inb(PORT);
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}
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int is_transmit_empty()
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{
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return inb(PORT + 5) & 0x20;
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}
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void write_serial(char a)
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{
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while (is_transmit_empty() == 0);
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outb(PORT, a);
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}
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#undef PORT
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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/*
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* Convert numbers to hexadecimal chars.
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*/
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char nibble_to_hex(int n)
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{
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if (n>=0 && n<10) return (n+48);
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else if (n>=10 && n<16) return (n+55+32);
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else return '?';
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}
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void int_to_hex(char *hex, uint64_t a, size_t size)
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{
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int i = 0;
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int divisor = size << 3;
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while (divisor != 0) {
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divisor -= 4;
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hex[i] = nibble_to_hex((a >> divisor) & 0xF);
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i += 1;
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}
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}
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void u8_to_hex (char *s, uint8_t a) { int_to_hex(s, a, 1); }
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void u16_to_hex(char *s, uint16_t a) { int_to_hex(s, a, 2); }
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void u32_to_hex(char *s, uint32_t a) { int_to_hex(s, a, 4); }
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void u64_to_hex(char *s, uint64_t a) { int_to_hex(s, a, 8); }
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/*
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* Logging functions.
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*/
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// Use serial for log output.
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#define PUTCHAR write_serial
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// Sends buffer of a given size to the log.
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void klog(char *buff, int size)
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{
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for (int i=0; i<size; ++i) PUTCHAR(buff[i]);
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}
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// Like klog but also sends a newline character.
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void klogl(char *buff, int size)
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{
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klog(buff, size); PUTCHAR('\n');
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}
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// Sends a NUL-terminated string to the log (not including the NUL).
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void klogs(const char *str)
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{
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while(*str) PUTCHAR(*str++);
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}
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#undef PUTCHAR
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// Functions that send integers to the log, in hex (without 0x prefix).
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#define B hexbuff
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#define D char B[16] = {0}
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void klog_u8 (uint8_t a) { D; u8_to_hex (B, a); klog(B, 2) ; }
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void klog_u16(uint16_t a) { D; u16_to_hex(B, a); klog(B, 4) ; }
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void klog_u32(uint32_t a) { D; u32_to_hex(B, a); klog(B, 8) ; }
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void klog_u64(uint64_t a) { D; u64_to_hex(B, a); klog(B, 16); }
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// These send a newline character too.
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void klogl_u8 (uint8_t a) { D; u8_to_hex (B, a); klogl(B, 2) ; }
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void klogl_u16(uint16_t a) { D; u16_to_hex(B, a); klogl(B, 4) ; }
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void klogl_u32(uint32_t a) { D; u32_to_hex(B, a); klogl(B, 8) ; }
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void klogl_u64(uint64_t a) { D; u64_to_hex(B, a); klogl(B, 16); }
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#undef D
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#undef B
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void demo_klog_functions(void)
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{
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klogs("\nCheck; one, two, one, two.\n");
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klogl_u8(0x01);
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klogl_u16(0x2345);
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klogl_u32(0x6789abcd);
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klogl_u64(0xef0123456789abcd);
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klog_u8(0x01);
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klog_u16(0x2345);
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klog_u32(0x6789abcd);
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klog_u64(0xef0123456789abcd);
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klogs("\n0123456789abcdef0123456789abcd\n");
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}
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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#define PIC1 0x20 /* IO base address for master PIC */
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#define PIC2 0xA0 /* IO base address for slave PIC */
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#define PIC1_COMMAND PIC1
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#define PIC1_DATA (PIC1+1)
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#define PIC2_COMMAND PIC2
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#define PIC2_DATA (PIC2+1)
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#define ICW1_ICW4 0x01 /* Indicates that ICW4 will be present */
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#define ICW1_INIT 0x10 /* Initialization - required! */
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#define ICW4_8086 0x01 /* 8086/88 (MCS-80/85) mode */
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void pic_remap(int offset)
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{
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uint8_t a1, a2;
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// save masks
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a1 = inb(PIC1_DATA); a2 = inb(PIC2_DATA);
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// starts the initialization sequence (in cascade mode)
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outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4); io_wait();
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outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4); io_wait();
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// ICW2: Master PIC vector offset
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outb(PIC1_DATA, offset); io_wait();
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// ICW2: Slave PIC vector offset
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outb(PIC2_DATA, offset+8); io_wait();
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// ICW3: tell Master PIC that there is a slave PIC at IRQ2 (0000 0100)
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outb(PIC1_DATA, 4); io_wait();
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// ICW3: tell Slave PIC its cascade identity (0000 0010)
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outb(PIC2_DATA, 2); io_wait();
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// ICW4: have the PICs use 8086 mode (and not 8080 mode)
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outb(PIC1_DATA, ICW4_8086); io_wait();
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outb(PIC2_DATA, ICW4_8086); io_wait();
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// restore saved masks.
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outb(PIC1_DATA, a1); outb(PIC2_DATA, a2);
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}
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void pic_end_of_irq(int irq)
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{
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if (irq >= 8) outb(PIC2_COMMAND, 0x20);
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outb(PIC1_COMMAND, 0x20);
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}
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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struct gdt_descriptor
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{
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uint16_t limit;
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uint32_t base;
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} __attribute__((packed));
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void sgdt(struct gdt_descriptor *gdtd)
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{
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__asm__ volatile ("sgdt %0" : : "m"(*gdtd) : "memory");
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}
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void klog_info_about_gdt(void)
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{
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struct gdt_descriptor gdtd;
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sgdt(&gdtd);
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klogs("**\n GDT info:\n");
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klogl_u32(gdtd.base);
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klogl_u16(gdtd.limit);
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// For each (8 bytes long) entry in the table...
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for (uint32_t b = gdtd.base; b < gdtd.base + gdtd.limit; b += 8) {
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// ... log each byte, in hex.
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for (uint32_t i = b; i < b + 8; ++i) {
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klog_u8(*(uint8_t*)i);
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}
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klogs("\n");
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}
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}
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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struct idt_gate_descriptor
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{
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uint16_t offset_1; // offset bits 0..15
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uint16_t selector; // a code segment selector in GDT or LDT
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uint8_t zero; // unused, set to 0
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uint8_t type_attributes; // gate type, dpl, and p fields
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uint16_t offset_2; // offset bits 16..31
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} __attribute__((packed));
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#define PIC_REMAP_OFFSET 0x20
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// The IDT begins with gates for the exceptions; we remap the PIC to start at
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// some point after them. For the PIC IRQs that's 16 gates more. If we define
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// our software interrupts... we'll have to make room.
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#define IDT_NUM_GATES (PIC_REMAP_OFFSET + 16)
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__attribute__((aligned(0x10)))
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struct idt_gate_descriptor idt[IDT_NUM_GATES] = {0};
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static inline void lidt(void)
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{
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struct {
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uint16_t limit;
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void *base;
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} __attribute__((packed)) src = { IDT_NUM_GATES * 8 - 1, idt };
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__asm__ ("lidt %0" : : "m"(src) );
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}
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struct interrupt_frame; // Not defined yet, but we need a pointer to it.
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|
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#define GATE_F void (*f)(struct interrupt_frame *)
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#define GATE_WITH_ERR_F void (*f)(struct interrupt_frame *, uint32_t)
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#define FOR_INTR 0x8e /* Present, DPL 0, 32b interrupt gate */
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#define FOR_TRAP 0x8f /* Present, DPL 0, 32b trap gate */
|
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struct idt_gate_descriptor gate(uint8_t type_attributes, uint32_t f)
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{
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return (struct idt_gate_descriptor){
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.type_attributes = type_attributes,
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.selector = 0x0008, // Our code segment in GDT, ring0 requested.
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.offset_1 = (uint16_t)(f & 0xffff),
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.offset_2 = (uint16_t)((f>>16) & 0xffff),
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.zero = 0x00
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};
|
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}
|
||||
|
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void klog_idt_gate_update(int n)
|
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{
|
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klogs(" "); klog_u8(n);
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}
|
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|
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void set_irq_handler(size_t irq, GATE_F)
|
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{
|
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idt[irq + PIC_REMAP_OFFSET] = gate(FOR_INTR, (uint32_t)f);
|
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klog_idt_gate_update(irq);
|
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}
|
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|
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void set_exception_with_err_handler(size_t number, GATE_WITH_ERR_F)
|
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{
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idt[number] = gate(FOR_TRAP, (uint32_t)f);
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klog_idt_gate_update(number);
|
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}
|
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|
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void set_exception_handler(size_t number, GATE_F)
|
||||
{
|
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idt[number] = gate(FOR_TRAP, (uint32_t)f);
|
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klog_idt_gate_update(number);
|
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}
|
||||
|
||||
#undef FOR_TRAP
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#undef FOR_INTR
|
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#undef GATE_WITH_ERR_F
|
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#undef GATE_F
|
||||
|
||||
void pic_clear_irq(uint8_t irq)
|
||||
{
|
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uint16_t port;
|
||||
uint8_t value;
|
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if(irq < 8) {
|
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port = PIC1_DATA;
|
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} else {
|
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port = PIC2_DATA; irq -= 8;
|
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}
|
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value = inb(port) & ~(1 << irq);
|
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outb(port, value);
|
||||
}
|
||||
|
||||
void pic_mask_all_irqs(void)
|
||||
{
|
||||
outb(PIC1_DATA, 0xff); outb(PIC2_DATA, 0xff);
|
||||
}
|
||||
|
||||
static inline void sti(void)
|
||||
{
|
||||
__asm__ volatile ("sti");
|
||||
}
|
||||
|
||||
//////////////////////////////////////////////////////////////////////
|
||||
|
||||
//////////////////////////////////////////////////////////////////////
|
||||
|
||||
//////////////////////////////////////////////////////////////////////
|
||||
|
||||
void panic(void)
|
||||
{
|
||||
klogs("Panic: halt.");
|
||||
__asm__ volatile ("cli; hlt;");
|
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}
|
||||
|
||||
__attribute__((interrupt))
|
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void exception_with_err_handler(struct interrupt_frame *frame, uint32_t error_code)
|
||||
{
|
||||
(void)frame;
|
||||
klogs("\n(generic handler) Exception with err "); klogl_u32(error_code);
|
||||
panic();
|
||||
}
|
||||
|
||||
__attribute__((interrupt))
|
||||
void exception_handler(struct interrupt_frame *frame)
|
||||
{
|
||||
(void)frame;
|
||||
klogs("\n(generic handler) Exception\n");
|
||||
panic();
|
||||
}
|
||||
|
||||
__attribute__((interrupt))
|
||||
void exception_de(struct interrupt_frame *frame)
|
||||
{
|
||||
(void)frame;
|
||||
klogs("\nException: Divide Error.\n");
|
||||
panic();
|
||||
}
|
||||
|
||||
__attribute__((interrupt))
|
||||
void exception_gp(struct interrupt_frame *frame, uint32_t error_code)
|
||||
{
|
||||
(void)frame;
|
||||
klogs("\nException: General Protection; error code "); klogl_u32(error_code);
|
||||
panic();
|
||||
}
|
||||
|
||||
__attribute__((interrupt))
|
||||
void irq1_handler(struct interrupt_frame *frame)
|
||||
{
|
||||
(void)frame;
|
||||
uint8_t k = inb(0x60);
|
||||
klogs("Key: "); klogl_u8(k);
|
||||
if (k == /* q */ 0x90) terminate = true;
|
||||
pic_end_of_irq(1);
|
||||
}
|
||||
|
||||
__attribute__((interrupt))
|
||||
void irq4_handler(struct interrupt_frame *frame)
|
||||
{
|
||||
(void)frame;
|
||||
uint8_t c = read_serial();
|
||||
write_serial(c); // Echo.
|
||||
|
||||
// Testing stuff when receiving some chars.
|
||||
if (c == 'q') terminate = true;
|
||||
if (c == '0')
|
||||
__asm__ volatile ("mov $0, %bl; div %bl"); // Division by zero.
|
||||
if (c == 'f')
|
||||
__asm__ volatile ("int $13;"); // General Protection fault.
|
||||
|
||||
pic_end_of_irq(4);
|
||||
}
|
||||
|
||||
void init_interrupts(void)
|
||||
{
|
||||
klogs("**\n Init interrupts\n");
|
||||
|
||||
klogs("Preparing PIC.\n");
|
||||
pic_mask_all_irqs();
|
||||
pic_remap(PIC_REMAP_OFFSET);
|
||||
|
||||
klogs("Init exceptions.\n");
|
||||
#define A(n) set_exception_handler(n, &exception_handler)
|
||||
#define B(n) set_exception_with_err_handler(n, &exception_with_err_handler)
|
||||
set_exception_handler(0, &exception_de);
|
||||
A(1); A(2); A(3); A(4); A(5); A(6); A(7); B(8); A(9);
|
||||
B(10); B(11); B(12);
|
||||
set_exception_with_err_handler(13, &exception_gp);
|
||||
B(14); A(15); A(16); B(17); A(18); A(19);
|
||||
A(20); B(21); A(28); B(29); B(30);
|
||||
#undef B
|
||||
#undef A
|
||||
|
||||
klogs("\nInit IRQs.\n");
|
||||
|
||||
// Assign handlers to hardware interrupts.
|
||||
// Use the IRQ number here (the offset is applied elsewhere).
|
||||
set_irq_handler(1, &irq1_handler); // Keyboard.
|
||||
set_irq_handler(4, &irq4_handler); // Serial.
|
||||
klogs("\n");
|
||||
|
||||
// Make our IDT the active one.
|
||||
lidt();
|
||||
|
||||
// Unmask hardware interrupts that we're ready to handle.
|
||||
pic_clear_irq(1);
|
||||
pic_clear_irq(4);
|
||||
|
||||
// Start accepting IRQs (that is... from the PIC).
|
||||
sti();
|
||||
}
|
||||
|
||||
//////////////////////////////////////////////////////////////////////
|
||||
|
||||
//////////////////////////////////////////////////////////////////////
|
||||
|
||||
//////////////////////////////////////////////////////////////////////
|
||||
|
||||
void kmain(void)
|
||||
{
|
||||
const uint16_t color = 0x0F00;
|
||||
const char *hello = "Hello C world!";
|
||||
volatile uint16_t *vga = (volatile uint16_t *)0xb8000;
|
||||
init_serial();
|
||||
klogs("Hello from kmain!\n");
|
||||
demo_klog_functions();
|
||||
|
||||
for (int i = 0; i < 16; ++i)
|
||||
{
|
||||
init_interrupts();
|
||||
|
||||
const uint16_t color = 0x7e00;
|
||||
volatile uint16_t *vga = (volatile uint16_t *)0xb8000;
|
||||
const char *hello = "Hello! Please, see serial output.";
|
||||
|
||||
for (int i = 0; hello[i] != 0; ++i) {
|
||||
vga[i + 80] = color | (uint16_t)hello[i];
|
||||
}
|
||||
}
|
||||
|
||||
klog_info_about_gdt();
|
||||
|
||||
klogs("\n\n**\n Ready!\n");
|
||||
klogs(
|
||||
"(accepting input from keyboard)\n"
|
||||
" type q to return from kmain\n"
|
||||
" key info sent to serial\n"
|
||||
"(accepting input from serial, with echo)\n"
|
||||
" send q to return from kmain\n"
|
||||
" send f to invoke GPF\n"
|
||||
" send 0 to trigger divide by zero\n"
|
||||
);
|
||||
while (!terminate) {
|
||||
__asm__ volatile ("hlt");
|
||||
}
|
||||
|
||||
klogs("\nkmain returning now... o/\n");
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user