Merge branch 'master' of ssh://git.dehosting.club:3022/quintenk/kornos

.gdbinit

@@ -0,0 +1,2 @@
+file kernel/bin/kernel-x86_64
+target remote :1234

Makefile

@@ -17,7 +17,6 @@ run: $(KERNEL_HDD)
 	-drive file=$(KERNEL_HDD),format=raw \
 	-smp 2 \
 	-enable-kvm \
-	-debugcon stdio \
 	$(QEMUFLAGS)
 
 bochs: $(KERNEL_HDD) ext/bochsrc

kernel/Makefile

@@ -8,7 +8,7 @@ LDSCRIPT        = make/$(ARCH)/linker.ld
 
 -include make/$(ARCH)/make.config
 
-CFLAGS          ?= -O2
+CFLAGS          ?= -Og -g
 CFLAGS          := $(CFLAGS) $(ARCH_CFLAGS) \
                    -Wall -Wextra -pedantic -Wno-language-extension-token -std=gnu11 -I../ext -Isrc -fPIE
 LDFLAGS         := $(LDFLAGS) -T $(LDSCRIPT) 

kernel/src/arch/x86/ops.c

@@ -1,4 +1,9 @@
+
+#include <print/print.h>
 void halt_catch_fire() {
     asm volatile ("cli");
-    while(1) asm volatile ("hlt");
+    while(1) {
+        asm volatile ("hlt");
+        puts("INTERRUPTED!");
+    };
 }

kernel/src/arch/x86_64/entry-stivale2.c

@@ -7,6 +7,8 @@
 
 #include <main.h>
 
+#include "gdt.h"
+
 static uint8_t stack[4096] = {0};
 void stivale2_main(struct stivale2_struct *info);
 
@@ -28,7 +30,7 @@ struct stivale2_header header2 = {
 
 void stivale2_main(struct stivale2_struct *info) {
     parse_stivale2(info);
-    print_stivale2_memmap(info);
+    // print_stivale2_memmap(info);
 
     uint64_t* cr3;
     __asm__ __volatile__ (
@@ -39,6 +41,14 @@ void stivale2_main(struct stivale2_struct *info) {
     );
     printf("PAGE TABLE AT: %x\n", cr3);
 
+    struct gdt_ptr pGDT;
+    __asm__ __volatile__("sgdt %0" : : "m"(pGDT) : "memory");
+    printf("GDT: %x (%d)\n", pGDT.base, pGDT.limit);
+    for(int i = 0; i < (pGDT.limit+1)/8; i++) {
+        uint64_t *gdt_ent = pGDT.base + 8*i;
+        printf("GDTent(%d at %x): %x\n", i, gdt_ent, *gdt_ent);
+    }
+
 	char *argv[3] = {"stivale2", info->bootloader_brand, info->bootloader_version};
     kmain(3, argv);
 }

kernel/src/arch/x86_64/gdt.h

@@ -0,0 +1,9 @@
+#include <stdint.h>
+
+struct gdt_ptr
+{
+    uint16_t limit;
+    uint64_t base;
+} __attribute__((packed));
+
+void loadgdt();

kernel/src/arch/x86_64/gdt.nasm

@@ -0,0 +1,16 @@
+section .rodata
+gdt64:
+    dq 0
+.code: equ $-gdt64
+    dq (1<<44) | (1<<47) | (1<<41) | (1<<43) | (1<<53)
+.data: equ $ - gdt64
+    dq (1<<44) | (1<<47) | (1<<41)
+.pointer:
+    dw .pointer - gdt64 - 1
+    dq gdt64
+
+section .text
+global loadgdt
+loadgdt:
+    lgdt [gdt64.pointer]
+    

kernel/src/main.c

@@ -11,7 +11,7 @@ void kmain() {
 	printf("Bootloader type: %s (%s %s)\n", boot_info.boot_protocol, boot_info.bootloader_name, boot_info.bootloader_ver);
 	printf("System time: %d\n", boot_info.epoch);
 	printf("Usable memory: %h (at %x)\n", boot_info.usable.len, boot_info.usable.start);
-	printf("Cmdline: %s", boot_info.cmdline);
+	printf("Cmdline: %s\n", boot_info.cmdline);
 
 	vga_setcolor(VGA_DARK_GRAY);
 	vga_write_elsewhere("(c) Quinten Kock 2020 (MIT License)", 24, 0);

kernel/src/print/print.c

@@ -32,8 +32,12 @@ static void printhex(size_t num) {
         num /= 16;
     }
 
-    i++;
     puts("0x");
+    for(int j = i; j >= 0; j--) {
+        putchar('0');
+    }
+
+    i++;
     puts(&buf[i]);
 }