it wont work goddammit

This commit is contained in:
c0repwn3r 2022-05-13 17:00:50 -04:00
parent 12193e7920
commit 35d08c3a9c
Signed by: core
GPG Key ID: FDBF740DADDCEECF
20 changed files with 323 additions and 27 deletions

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@ -37,11 +37,11 @@ obj/%.o: src/%.asm
run: clean bin/shade.iso
qemu-system-x86_64 -hdd bin/shade.iso
qemu-system-x86_64 -hdd bin/shade.iso -d int -no-reboot
debug: clean bin/shade.iso bin/shade.bin
qemu-system-x86_64 -s -S -hdd bin/shade.iso &
${GDB} os-image.bin -ex "symbol-file bin/shade.bin" -ex "target remote localhost:1234"
qemu-system-x86_64 -s -S -hdd bin/shade.iso -d int -no-reboot &
${GDB} os-image.bin -ex "set arch i386:x86-64" -ex "symbol-file bin/shade.bin" -ex "target remote localhost:1234"
clean:

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bin/shade.iso.lock Normal file
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57
bochsrc.txt Normal file
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@ -0,0 +1,57 @@
# configuration file generated by Bochs
plugin_ctrl: unmapped=true, biosdev=true, speaker=true, extfpuirq=true, parallel=true, serial=true, iodebug=true, pcidev=false, usb_uhci=false
config_interface: textconfig
display_library: x
memory: host=32, guest=32
romimage: file="/usr/share/bochs/BIOS-bochs-latest", address=0x00000000, options=none
vgaromimage: file="/usr/share/bochs/VGABIOS-lgpl-latest"
boot: floppy
floppy_bootsig_check: disabled=0
floppya: type=1_44
# no floppyb
ata0: enabled=true, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
ata0-master: type=disk, path="bin/shade.iso", mode=flat, cylinders=0, heads=0, spt=0, sect_size=512, model="Generic 1234", biosdetect=auto, translation=auto
ata0-slave: type=none
ata1: enabled=true, ioaddr1=0x170, ioaddr2=0x370, irq=15
ata1-master: type=none
ata1-slave: type=none
ata2: enabled=false
ata3: enabled=false
optromimage1: file=none
optromimage2: file=none
optromimage3: file=none
optromimage4: file=none
optramimage1: file=none
optramimage2: file=none
optramimage3: file=none
optramimage4: file=none
pci: enabled=1, chipset=i440fx, slot1=none, slot2=none, slot3=none, slot4=none, slot5=none
vga: extension=vbe, update_freq=5, realtime=1, ddc=builtin
cpu: count=1:1:1, ips=4000000, quantum=16, model=bx_generic, reset_on_triple_fault=1, cpuid_limit_winnt=0, ignore_bad_msrs=1, mwait_is_nop=0
cpuid: level=6, stepping=3, model=3, family=6, vendor_string="AuthenticAMD", brand_string="AMD Athlon(tm) processor"
cpuid: mmx=true, apic=xapic, simd=sse2, sse4a=false, misaligned_sse=false, sep=true
cpuid: movbe=false, adx=false, aes=false, sha=false, xsave=false, xsaveopt=false, avx_f16c=false
cpuid: avx_fma=false, bmi=0, xop=false, fma4=false, tbm=false, x86_64=true, 1g_pages=false
cpuid: pcid=false, fsgsbase=false, smep=false, smap=false, mwait=true
print_timestamps: enabled=0
debugger_log: -
magic_break: enabled=0
port_e9_hack: enabled=0
private_colormap: enabled=0
clock: sync=none, time0=local, rtc_sync=0
# no cmosimage
log: -
logprefix: %t%e%d
debug: action=ignore
info: action=report
error: action=report
panic: action=ask
keyboard: type=mf, serial_delay=250, paste_delay=100000, user_shortcut=none
mouse: type=ps2, enabled=false, toggle=ctrl+mbutton
speaker: enabled=true, mode=system
parport1: enabled=true, file=none
parport2: enabled=false
com1: enabled=true, mode=null
com2: enabled=false
com3: enabled=false
com4: enabled=false

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@ -1,3 +1,4 @@
gdt_start: ; use labels to compute sizes and jumps
; gdt starts with 8 byte null
dd 0x0

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@ -0,0 +1,28 @@
#ifndef GDT_H
#define GDT_H
#include <stdint.h>
// the GDT descriptor format makes literally no sense, who came up with this
typedef struct {
uint16_t limit_low16; // Low 16 bits of limit
uint16_t base_low16; // Low 16 bits of base
uint8_t base_mid8; // Middle 8 bits of base
uint8_t access; // 7: present, 6-5: priv level, 4: type, 3: executable, 2: dc, 1: rw, 0: accessed (zero)
uint8_t limit_flags; // High 4 bits of limit AND flags (?? why). flags: 3: granularity, 2: size, 1: long, 0: reserved
uint8_t base_high8; // High 8 bits of base
} __attribute__((packed)) gdt_entry_t;
typedef struct {
uint16_t size; // GDT size (bytes) - 1
uint32_t offset; // Address of element 0 of the GDT
} __attribute__((packed)) gdt_ptr_t;
static gdt_entry_t gdt[8192];
static gdt_ptr_t gdtr;
void init_gdt();
void gdt_set_segment(int limit, int base, int access);
void load_gdt();
#endif

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@ -18,6 +18,8 @@ stack_bottom:
resb 16384
stack_top:
%include "src/gdt.asm"
; _start = entry to kernel
; Since the bootloader will be gone, it doesn't make sense to return from this
section .text
@ -27,6 +29,18 @@ _start:
; 32bit protected mode, no int, no paging
mov esp, stack_top ; Initialize stack
cli ; Disable interrupts
lgdt [gdt_descriptor] ; load the GDT
jmp CODE_SEG:.reload_seg ; far jump into a different segment
.reload_seg: ; now in 32bit
mov ax, DATA_SEG ; update segment registers
mov ds, ax
mov ss, ax
mov es, ax
mov fs, ax
mov gs, ax
extern kmain
call kmain

33
src/gdt.asm Normal file
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@ -0,0 +1,33 @@
section .data
gdt_start: ; use labels to compute sizes and jumps
; gdt starts with 8 byte null
dd 0x0
dd 0x0
; GDT for code segment, base = 0x00000000, length = 0xfffff
gdt_code:
dw 0xffff ; segment length
dw 0x0 ; segment base
db 0x0 ; segment base
db 10011010b ; flags
db 11001111b ; flags + segment length
db 0x0 ; segment base
; GDT for data segment
gdt_data:
dw 0xffff ; segment length
dw 0x0 ; segment base
db 0x0 ; segment base
db 10010010b ; flags
db 11001111b ; flags + segment length
db 0x0 ; segment base
gdt_end:
gdt_descriptor:
dw gdt_end - gdt_start - 1 ; size, always 1 less than what it actually is
dd gdt_start ; address
CODE_SEG equ gdt_code - gdt_start
DATA_SEG equ gdt_data - gdt_start

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@ -1,3 +1,6 @@
set timeout=0
set default=0
menuentry "shadeOS Dev Build" {
multiboot /boot/shade.bin
}

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@ -1,7 +1,6 @@
#include "./platform/drivers/ports.h"
#include "print.h"
#include "./platform/types.h"
//#include "./platform/interrupts/int.h"
#include "./platform/interrupts/int.h"
void dummy_test_entrypoint() {}
@ -46,10 +45,10 @@ void kmain() {
print_str("Copyright (c) e3team 2022. All rights reserved.\n");
print_str("This program is provided \"as-is\" and no express or implied warranty is provided.\n");
print_str("The full license can be found at /sys/LICENCE on this system or ./LICENCE in the source tree.\n");
/*
idt_init();
kernel_msg_ok("Interrupts initialized");
__asm__ __volatile__("int $2");
*/
//kernel_msg_ok("Interrupts working");
}

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@ -0,0 +1,35 @@
#include "int.h"
#include "../../print.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
int count = 0;
void exception_handler() {
print_str("I");
}
void idt_set_descriptor(uint8_t vector, void* isr, uint8_t flags) {
idt_entry_t* descriptor = &idt[vector];
descriptor->isr_low = (uint32_t)isr & 0xFFFF;
descriptor->kernel_cs = 0x08; // this value can be whatever offset your kernel code selector is in your GDT
descriptor->attributes = flags;
descriptor->isr_high = (uint32_t)isr >> 16;
descriptor->reserved = 0;
}
void idt_init() {
idtr.base = (uint32_t)&idt[0];
idtr.limit = (uint16_t)sizeof(idt_entry_t) * 256 - 1;
for (uint8_t vector = 0; vector < 32; vector++) {
idt_set_descriptor(vector, isr_stub_table[vector], 0x8E);
isr_stub_table[vector] = true;
}
__asm__ volatile ("lidt %0" : : "m"(idtr)); // load the new IDT
__asm__ volatile ("sti"); // set the interrupt flag
}

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@ -0,0 +1,43 @@
#ifndef INT_H
#define INT_H
#include "../../util.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
typedef struct {
uint16_t isr_low; // The lower 16 bits of the ISR's address
uint16_t kernel_cs; // The GDT segment selector that the CPU will load into CS before calling the ISR
uint8_t reserved; // Set to zero
uint8_t attributes; // Type and attributes; see the IDT page
uint16_t isr_high; // The higher 16 bits of the ISR's address
} __attribute__((packed)) idt_entry_t;
__attribute__((aligned(0x10)))
static idt_entry_t idt[256]; // Create an array of IDT entries; aligned for performance
typedef struct {
uint16_t limit;
uint32_t base;
} __attribute__((packed)) idtr_t;
static idtr_t idtr;
typedef struct {
uint32_t ds; /* Data segment selector */
uint32_t edi, esi, ebp, esp, ebx, edx, ecx, eax; /* Pushed by pusha. */
uint32_t int_no, err_code; /* Interrupt number and error code (if applicable) */
uint32_t eip, cs, eflags, useresp, ss; /* Pushed by the processor automatically */
} registers_t;
__attribute__((noreturn))
void exception_handler();
void idt_set_descriptor(uint8_t vector, void* isr, uint8_t flags);
extern void* isr_stub_table[];
void idt_init(void);
#endif

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@ -0,0 +1,101 @@
%macro isr_err_stub 1
isr_stub_%+%1:
;push byte %1 ; Push interrupt no to stack
; 1. Save CPU state
;pusha ; Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
;mov ax, ds ; Lower 16-bits of eax = ds.
;push eax ; save the data segment descriptor
;mov ax, 0x10 ; kernel data segment descriptor
;mov ds, ax
;mov es, ax
;mov fs, ax
;mov gs, ax
; 2. Call C handler
call exception_handler
; 3. Restore state
;pop eax
;mov ds, ax
;mov es, ax
;mov fs, ax
;mov gs, ax
;popa
;add esp, 8 ; Cleans up the pushed error code and pushed ISR number
iret ; pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP
%endmacro
; if writing for 64-bit, use iretq instead
%macro isr_no_err_stub 1
isr_stub_%+%1:
;push byte 0 ; No error occured
;push byte %1 ; Push interrupt no to stack
; 1. Save CPU state
;pusha ; Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
;mov ax, ds ; Lower 16-bits of eax = ds.
;push eax ; save the data segment descriptor
;mov ax, 0x10 ; kernel data segment descriptor
;mov ds, ax
;mov es, ax
;mov fs, ax
;mov gs, ax
; 2. Call C handler
call exception_handler
; 3. Restore state
;pop eax
;mov ds, ax
;mov es, ax
;mov fs, ax
;mov gs, ax
;popa
;add esp, 8 ; Cleans up the pushed error code and pushed ISR number
;sti
iret ; pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP
%endmacro
extern exception_handler
isr_no_err_stub 0
isr_no_err_stub 1
isr_no_err_stub 2
isr_no_err_stub 3
isr_no_err_stub 4
isr_no_err_stub 5
isr_no_err_stub 6
isr_no_err_stub 7
isr_err_stub 8
isr_no_err_stub 9
isr_err_stub 10
isr_err_stub 11
isr_err_stub 12
isr_err_stub 13
isr_err_stub 14
isr_no_err_stub 15
isr_no_err_stub 16
isr_err_stub 17
isr_no_err_stub 18
isr_no_err_stub 19
isr_no_err_stub 20
isr_no_err_stub 21
isr_no_err_stub 22
isr_no_err_stub 23
isr_no_err_stub 24
isr_no_err_stub 25
isr_no_err_stub 26
isr_no_err_stub 27
isr_no_err_stub 28
isr_no_err_stub 29
isr_err_stub 30
isr_no_err_stub 31
global isr_stub_table
isr_stub_table:
%assign i 0
%rep 32
dd isr_stub_%+i ; use DQ instead if targeting 64-bit
%assign i i+1
%endrep

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@ -1,18 +0,0 @@
#ifndef TYPES_H
#define TYPES_H
typedef unsigned int u32;
typedef int i32;
typedef unsigned short u16;
typedef short i16;
typedef unsigned char u8;
typedef char i8;
#define high16(i32) (i32 & 0xffff)
#define low16(i32) ((i32>>16) & 0xffff)
#define TRUE 1
#define FALSE 0
#define NULL 0
#endif

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@ -1,5 +1,5 @@
#include "strings.h"
#include "./platform/types.h"
#include <stddef.h>
void itoa(int n, char str[]) {
int i, sign;