diff options
Diffstat (limited to 'src/bringelle.c')
| -rw-r--r-- | src/bringelle.c | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/src/bringelle.c b/src/bringelle.c index 5fd315b..8faaecc 100644 --- a/src/bringelle.c +++ b/src/bringelle.c @@ -2,10 +2,15 @@ #include "utils/pic.h" #include "boot/multiboot.h" #include "utils/mem.h" +#include "utils/gdt.h" char show_tics=0; +extern GDT_TSS TSS; + void utask(){ + char msg[]="Message from the task :D"; + asm("mov $0x1, %%eax;int $0x30"::"b"(msg)); while(1); } @@ -15,14 +20,33 @@ void bringelle(){ // Kernel boot sequence pic_enable_interrupt(); - print("Interrupts enabled!\n"); - + print("Interrupts enabled\n"); + print("Kernel started !\n"); // Utask + print("Launch user task "); + show_tics=1; memcpy((void*)utask,(void*)0x300000, 100); // 100 bytes seems reasonable to load utask + asm ( + "cli \n\t" // Ensure we do not get interrupted + "movl %%ss, %%eax \n\t" + "movl %%eax, %0 \n\t" // Save kernel ss segment into the TSS + "movl %%esp, %1 \n\t" // Save kernel esp into the TSS BEFORE setting up the stack + "pushl $0x33 \n\t" // Push task ss which is 0x30 along with prlv which is 0x3 + "pushl $0x400000 \n\t" // Push task esp + "pushfl \n\t" // Retrieve flags + "popl %%eax \n\t" + "orl $0x200, %%eax \n\t" // Enable interrupt for the user task + "and $0xffffbfff, %%eax \n\t" // Clear the NT flags + "push %%eax \n\t" // Push task flags + "push $0x23 \n\t" // Push task cs which is 0x20 along with prlv which is 0x3 + "push $0 \n\t" // Push task entry point + "mov $0x2B, %%eax \n\t" // GDT entry 0x28 along with prlv which is 0x3 + "mov %%eax, %%ds \n\t" // Setting up user data segment + "iret \n\t" // Launch user task + : "=m" (TSS.ss0), "=m" (TSS.esp0) + ); - print("Kernel started "); - show_tics=1; while(1); } |