kernel: Prepare for v0.1-pre

README.md

@@ -6,13 +6,18 @@ The Soaplin kernel is a new Unix-like operating system kernel.
 * Memory management (VMM/PMM)
 * Simple pre-emptive scheduler
 * Ring 3 (user mode) support
+* ELF loader
+
+## In the works
+* Virtual File System
+* FPU support
 
 ## To come
 * RTC support
-* ELF loader
-* Virtual File System
 * EXT2 driver 
 * FAT32 driver
 * CPIO-based init ram disk
 * Video driver for Bochs graphics adapter, and the VMware display adapter.
-* FPU support
+
+## Known bugs
+* If a user process calls the syscall handler by using interrupts, the system may crash due to a Page Fault.

kernel/src/mm/vmm.c

@@ -29,21 +29,6 @@ pagemap_t *vmm_alloc_pm() {
   pagemap_t *pm = (pagemap_t *)HIGHER_HALF((uint64_t)pmm_request_page());
   memset(pm, 0, PMM_PAGE_SIZE);
 
-  /*if (vmm_kernel_pm_exists) {
-      pm->toplevel = (uint64_t*)HIGHER_HALF((uint64_t)pmm_request_page());
-      memset(pm->toplevel, 0, PMM_PAGE_SIZE);
-
-      for (int i = 256; i < 512; i++) {
-          pm->toplevel[i] = vmm_kernel_pm->toplevel[i];
-      }
-  } else {
-
-  __asm__ volatile("mov %%cr3, %0" : "=r"(pm->toplevel) : : "memory");
-  pm->toplevel = HIGHER_HALF(pm->toplevel);
-  logln(info, "vmm", "Limine-provided kernel PML4: %p", pm->toplevel);
-
-  }*/
-
   pm->toplevel = (uint64_t *)HIGHER_HALF((uint64_t)pmm_request_page());
   memset(pm->toplevel, 0, PMM_PAGE_SIZE);
 

kernel/src/sys/arch/x86_64/interrupts.c

@@ -74,5 +74,6 @@ void exception_handler(registers_t *regs) {
     syscall_handle(regs);
   }
   // logln(info, "arch/ints", "Received interrupt %d\n", regs->int_no);
+  //vmm_load_pagemap(curr_proc->pm);
   pic_ack(regs->int_no - 32);
 }

testing/test.asm

@@ -3,12 +3,7 @@ section .text
     global _start
 
 _start:
-    int 0x80
+    mov rax, 10
-    int 0x80
-    int 0x80
-    int 0x80
-    int 0x80
-    int 0x80
-    int 0x80
 .hey:
+    add rax, 1
     jmp .hey