...

.vscode/c_cpp_properties.json

@@ -2,14 +2,12 @@
     "version": 4,
     "configurations": [
         {
-            "name": "test",
+            "name": "kernel",
             "defines": [
                 "DEBUG"
             ],
             "includePath": [
-                "src/kernel",
+                "src/lib"
-                "src/arch",
-                "src"
             ],
             "intelliSenseMode": "linux-gcc-x64",
             "compilerPath": "/usr/bin/x86_64-elf-gcc",

.vscode/settings.json

@@ -31,6 +31,10 @@
         "assert.h": "c",
         "io.h": "c",
         "mem.h": "c",
-        "string.h": "c"
+        "string.h": "c",
+        "kernel.h": "c",
+        "printf.h": "c",
+        "vmm.h": "c",
+        "console.h": "c"
     }
 }

makefile

@@ -8,7 +8,7 @@ LDFLAGS = -g
 ASFLAGS = -g -F dwarf
 
 # Do not modify
-CFLAGS 	+= -m64 -ffreestanding -nostdinc -nostdlib -fno-builtin -Wall -Wextra -Wshadow -std=c23 -I src -I src/kernel -I src/arch
+CFLAGS 	+= -m64 -ffreestanding -nostdinc -nostdlib -fno-builtin -Wall -Wextra -Wshadow -std=c23 -I src/lib
 LDFLAGS	+=
 ASFLAGS	+= -f elf64
 

src/arch/x86_64/arch.c

@@ -1,9 +1,11 @@
-#include "arch.h"
 #include "console.h"
 #include "mem/pmm.h"
 #include "mem/vmm.h"
 #include "panic.h"
 #include "util.h"
+#include <arch.h>
+#include <def.h>
+#include <printf.h>
 
 static void arch_halt()
 {
@@ -20,9 +22,9 @@ static void arch_enable_interrupts()
     enable_interrupts();
 }
 
-static void arch_panic(const char* msg)
+static void arch_panic()
 {
-    panic(msg);
+    panic();
 }
 
 static void arch_console_putchar(char c)
@@ -49,7 +51,8 @@ void* arch_alloc(size_t page_count)
         u64 physical_address = pmm_alloc();
         if (!physical_address)
         {
-            panic("Out of physical memory");
+            printf("Out of physical memory");
+            panic();
         }
 
         vmm_map(physical_address, virtual_address + (i * PAGE_SIZE), PTE_PRESENT | PTE_WRITABLE);

src/arch/x86_64/console.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "std.h"
+#include <def.h>
 
 #define VGA_BLACK 0
 #define VGA_BLUE 1

src/arch/x86_64/interrupts/exceptions.c

@@ -1,5 +1,6 @@
 #include "exceptions.h"
 #include "../panic.h"
+#include <printf.h>
 
 static const char* exception_messages[32] = {
     "divide by zero",
@@ -39,5 +40,5 @@ static const char* exception_messages[32] = {
 void handle_exception(const isr_frame_t* frame)
 {
     printf("exception[%d]: %s, error code: %d\n", frame->int_no, exception_messages[frame->int_no], frame->err_code);
-    panic("An unhandled exception occurred");
+    panic();
 }

src/arch/x86_64/interrupts/irq.c

@@ -1,5 +1,6 @@
 #include "irq.h"
 #include "../util.h"
+#include <printf.h>
 
 #define PIC1_COMMAND 0x20
 #define PIC1_DATA 0x21

src/arch/x86_64/interrupts/isr.c

@@ -1,6 +1,8 @@
 #include "isr.h"
 #include "exceptions.h"
 #include "irq.h"
+#include <def.h>
+#include <printf.h>
 
 void handle_isr(const isr_frame_t* frame)
 {

src/arch/x86_64/interrupts/isr.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "std.h"
+#include <def.h>
 
 typedef struct
 {

src/arch/x86_64/main.c

@@ -1,11 +1,13 @@
 #include "console.h"
 #include "interrupts/idt.h"
 #include "interrupts/irq.h"
-#include "kernel.h"
 #include "mem/pmm.h"
 #include "mem/vmm.h"
 #include "panic.h"
 #include "util.h"
+#include <printf.h>
+
+extern void kernel_main();
 
 void x86_64_main(u32 magic, multiboot_info_t* info, u32 kernel_page_count)
 {
@@ -13,12 +15,14 @@ void x86_64_main(u32 magic, multiboot_info_t* info, u32 kernel_page_count)
 
     if (magic != 0x2BADB002)
     {
-        panic("Multiboot magic does not match\n");
+        printf("Multiboot magic does not match\n");
+        panic();
     }
 
     if (info == NULL)
     {
-        panic("Multiboot info is NULL\n");
+        printf("Multiboot info is NULL\n");
+        panic();
     }
 
     idt_init();

src/arch/x86_64/mem/pmm.c

@@ -1,5 +1,7 @@
 #include "pmm.h"
-#include "x86_64/panic.h"
+#include "../panic.h"
+#include <mem.h>
+#include <printf.h>
 
 typedef struct
 {
@@ -27,7 +29,8 @@ void pmm_init(u32 kernel_page_count, multiboot_info_t* info)
 {
     if (!(info->flags & (1 << 6)))
     {
-        panic("Invalid memory map given by bootloader\n");
+        printf("Invalid memory map given by bootloader\n");
+        panic();
     }
 
     u64 offset = 0;
@@ -84,7 +87,8 @@ void pmm_init(u32 kernel_page_count, multiboot_info_t* info)
     {
         if (page >= BITMAP_PAGE_COUNT)
         {
-            panic("Bitmap is not large enough to hold the memory reserved by the kernel");
+            printf("Bitmap is not large enough to hold the memory reserved by the kernel");
+            panic();
         }
 
         page_bitmap[page / 8] |= (1 << (page % 8));
@@ -123,7 +127,7 @@ void pmm_free(u64 physical_address)
         else
         {
             printf("Physical address %x is already free", physical_address);
-            panic("Failed to free physical address");
+            panic();
         }
     }
 }

src/arch/x86_64/mem/pmm.h

@@ -1,7 +1,7 @@
 #pragma once
 
-#include "std.h"
+#include "../multiboot.h"
-#include "x86_64/multiboot.h"
+#include <def.h>
 
 // todo(nub31): Fixed at 2mb for now, might add support for 4k pages later
 #define PAGE_SIZE MiB(2)

src/arch/x86_64/mem/vmm.c

@@ -1,6 +1,7 @@
 #include "vmm.h"
+#include "../panic.h"
 #include "pmm.h"
-#include "x86_64/panic.h"
+#include <printf.h>
 
 #define PML4_INDEX(addr) (((addr) >> 39) & 0x1FF)
 #define PDPT_INDEX(addr) (((addr) >> 30) & 0x1FF)
@@ -23,7 +24,8 @@ void vmm_init(u32 kernel_page_count)
     {
         if (page >= BITMAP_PAGE_COUNT)
         {
-            panic("Bitmap is not large enough to hold the addresses reserved by the kernel");
+            printf("Bitmap is not large enough to hold the addresses reserved by the kernel");
+            panic();
         }
 
         page_bitmap[page / 8] |= (1 << (page % 8));
@@ -75,7 +77,7 @@ void vmm_free_address(u64 virtual_address, size_t page_count)
     if (start_page + page_count > BITMAP_PAGE_COUNT)
     {
         printf("Virtual address range exceeds bitmap bounds\n");
-        panic("Failed to free virtual address");
+        panic();
     }
 
     for (size_t i = 0; i < page_count; i++)
@@ -87,7 +89,7 @@ void vmm_free_address(u64 virtual_address, size_t page_count)
         if (!(page_bitmap[byte_index] & (1 << bit_index)))
         {
             printf("Virtual address 0x%x (page %u) is already free\n", virtual_address + (i * PAGE_SIZE), page);
-            panic("Failed to free virtual address");
+            panic();
         }
     }
 
@@ -105,7 +107,7 @@ static u64 create_2mb_pte(u64 physical_address, u32 flags)
     if (physical_address & (PAGE_SIZE - 1))
     {
         printf("Physical address not page aligned (0x%x)\n", physical_address);
-        panic("Failed to create PTE");
+        panic();
     }
 
     return (physical_address & PTE_MASK) | flags | PTE_PS;
@@ -122,7 +124,7 @@ void vmm_map(u64 physical_address, u64 virtual_address, u32 flags)
     {
         // todo(nub31): Dynamically create a pdpt table
         printf("PDPT not present at PML4 index %u\n", pml4_idx);
-        panic("Failed to map virtual to physical page");
+        panic();
     }
 
     u64* pdpt_physical_address = (u64*)(pdpt & PTE_MASK);
@@ -131,7 +133,7 @@ void vmm_map(u64 physical_address, u64 virtual_address, u32 flags)
     {
         // todo(nub31): Dynamically create a pd table
         printf("PD not present at PDPT index %u\n", pdpt_idx);
-        panic("Failed to map virtual to physical page");
+        panic();
     }
 
     u64* pd_physical_address = (u64*)(pd & PTE_MASK);
@@ -140,7 +142,7 @@ void vmm_map(u64 physical_address, u64 virtual_address, u32 flags)
     if (entry & PTE_PRESENT)
     {
         printf("Virtual address 0x%x is already mapped\n", virtual_address);
-        panic("Failed to map virtual to physical page");
+        panic();
     }
 
     pd_physical_address[pd_idx] = create_2mb_pte(physical_address, flags);
@@ -156,7 +158,7 @@ u64 vmm_unmap(u64 virtual_address)
     if (!(pdpt_entry & PTE_PRESENT))
     {
         printf("PDPT not present at PML4 index %llu\n", pml4_idx);
-        panic("Failed to unmap virtual address");
+        panic();
     }
 
     u64* pdpt_physical_address = (u64*)(pdpt_entry & PTE_MASK);
@@ -164,14 +166,14 @@ u64 vmm_unmap(u64 virtual_address)
     if (!(pd_entry & PTE_PRESENT))
     {
         printf("PD not present at PDPT index %llu\n", pdpt_idx);
-        panic("Failed to unmap virtual address");
+        panic();
     }
 
     u64* pd_physical_address = (u64*)(pd_entry & PTE_MASK);
     if (!(pd_physical_address[pd_idx] & PTE_PRESENT))
     {
         printf("Virtual address 0x%llx is not mapped\n", virtual_address);
-        panic("Failed to unmap virtual address");
+        panic();
     }
 
     u64 physical_address = pd_physical_address[pd_idx] & PTE_MASK;

src/arch/x86_64/mem/vmm.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "std.h"
+#include <def.h>
 
 // Defines the theoretical max virtual memory space the kernel can allocate
 // The value must be a multible of 8

src/arch/x86_64/panic.c

@@ -1,9 +1,8 @@
 #include "panic.h"
 #include "util.h"
 
-void panic(const char* msg)
+void panic()
 {
-    printf(msg);
     disable_interrupts();
     halt();
 }

src/arch/x86_64/panic.h

@@ -1,3 +1,3 @@
 #pragma once
 
-void panic(const char* msg);
+void panic();

src/arch/x86_64/util.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "std.h"
+#include <def.h>
 
 enum
 {

src/kernel/alloc.c

@@ -1,5 +1,4 @@
-#include "arch.h"
+#include <assert.h>
-#include "assert.h"
 
 typedef struct block_header
 {

src/kernel/alloc.h

@@ -1,6 +1,4 @@
 #pragma once
 
-#include "std.h"
-
 void* malloc(size_t size);
 void free(void* ptr);

src/kernel/kernel.c

@@ -1,22 +1,11 @@
 #include "kernel.h"
-#include "alloc.h"
+#include <arch.h>
-#include "arch.h"
+#include <printf.h>
-#include "assert.h"
-#include "std.h"
 
 void kernel_main()
 {
-    assert(false, "test");
-
     arch_api.enable_interrupts();
 
-    u64* mem = malloc(1);
-    *mem = 23;
-
-    printf("%d\n", *mem);
-
-    free(mem);
-
     printf("Welcome to nub OS :)\n");
     printf("Kernel has exited\n");
     arch_api.halt();

src/lib/arch.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "std.h"
+#include <def.h>
 
 typedef void (*arch_console_putchar_t)(char c);
 typedef void (*arch_console_clear_t)();
@@ -22,7 +22,7 @@ typedef struct
     const arch_mem_free_t free;
 } arch_mem_api_t;
 
-typedef void (*arch_panic_t)(const char* msg);
+typedef void (*arch_panic_t)();
 typedef void (*arch_enable_interrupts_t)();
 typedef void (*arch_disable_interrupts_t)();
 typedef void (*arch_halt_t)();

src/lib/assert.h

@@ -1,13 +1,14 @@
 #pragma once
 
-#include "arch.h"
+#include <arch.h>
 
+// In arch code, make sure arch_api.panic is set up befire calling
 static inline void assert(bool condition, const char* msg)
 {
 #if DEBUG
     if (!condition)
     {
-        arch_api.panic(msg);
+        arch_api.panic();
     }
 #endif
 }

src/lib/def.h

@@ -37,14 +37,20 @@ typedef signed long long i64;
 
 #define INT16_MIN (-32768)
 #define INT16_MAX 32767
+
+#define UINT16_MIN 0x0
 #define UINT16_MAX 0xffff
 
 #define INT32_MIN (-2147483647 - 1)
 #define INT32_MAX 2147483647
+
+#define UINT32_MIN 0x0
 #define UINT32_MAX 0xffffffffU
 
 #define INT64_MIN (-9223372036854775807LL - 1)
 #define INT64_MAX 9223372036854775807LL
+
+#define UINT64_MIN 0x0
 #define UINT64_MAX 0xffffffffffffffffULL
 
 #define INT8_C(x) x
@@ -59,10 +65,7 @@ typedef signed long long i64;
 #define INT64_C(x) x##LL
 #define UINT64_C(x) x##ULL
 
-#define INTMAX_C(x) x##LL
+#define KiB(count) (count * UINT64_C(count))
-#define UINTMAX_C(x) x##ULL
+#define MiB(count) (KiB(count) * UINT64_C(count))
-
+#define GiB(count) (MiB(count) * UINT64_C(count))
-#define KiB(count) ((u64)count * 1024)
+#define TiB(count) (GiB(count) * UINT64_C(count))
-#define MiB(count) (KiB((u64)count) * 1024)
-#define GiB(count) (MiB((u64)count) * 1024)
-#define TiB(count) (GiB((u64)count) * 1024)

src/lib/mem.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include <def.h>
+
+void memset(void* destination, u8 value, size_t length);
+void memcpy(void* destination, void* source, size_t length);

src/lib/printf.c

@@ -1,4 +1,7 @@
-#include "arch.h"
+#include "printf.h"
+#include <arch.h>
+#include <def.h>
+#include <string.h>
 
 void printf(const char* fmt, ...)
 {

src/lib/printf.h

@@ -0,0 +1,4 @@
+#pragma once
+
+// In arch code, make sure arch_api.console.putchar is set up befire calling
+void printf(const char* fmt, ...);

src/lib/string.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "std.h"
+#include <def.h>
 
 int strcmp(const char* a, const char* b);
 void reverse(char* str, size_t length);

src/std.h

@@ -1,6 +0,0 @@
-#pragma once
-
-#include "stdlib/def.h"
-#include "stdlib/io.h"
-#include "stdlib/mem.h"
-#include "stdlib/string.h"

src/stdlib/io.h

@@ -1,3 +0,0 @@
-#pragma once
-
-void printf(const char* fmt, ...);

src/stdlib/mem.h

@@ -1,6 +0,0 @@
-#pragma once
-
-#include "std.h"
-
-void memset(void* destination, u8 value, size_t length);
-void memcpy(void* destination, void* source, size_t length);