user thread/process and elf loader stub

src/arch/x86_64/include/arch/mmu.h

@@ -22,5 +22,7 @@ void* arch_mmu_getphysicaladdr(arch_mmu_tableptr, void*);
 void arch_mmu_unmap(arch_mmu_tableptr, void*);
 void arch_mmu_init();
 void arch_mmu_apinit();
+arch_mmu_tableptr arch_mmu_newcontext();
+void arch_mmu_switchcontext(arch_mmu_tableptr);
 
 #endif

src/arch/x86_64/include/arch/regs.h

@@ -9,5 +9,6 @@ typedef struct{
 } arch_regs;
 
 void arch_regs_setupkernel(arch_regs* regs, void* ip, void* stack, bool interrupts);
+void arch_regs_setupuser(arch_regs* regs, void* ip, void* stack, bool interrupts);
 
 #endif

src/arch/x86_64/main.c

@@ -27,8 +27,20 @@ struct limine_terminal_response* liminetty;
 
 int  ttylock = 0;
 
+static vmm_context* liminettyctx;
+
 void liminewrite(char* str, size_t c){
+
+	vmm_context* old = arch_getcls()->context;
+	
+	if(liminettyctx)
+		vmm_switchcontext(liminettyctx);
+	
 	liminetty->write(liminetty->terminals[0], str, c);
+	
+	if(liminettyctx)
+		vmm_switchcontext(old);
+	
 }
 
 void kmain(){
@@ -52,6 +64,8 @@ void kmain(){
 	arch_mmu_init();
 	
 	vmm_init();	
+
+	liminettyctx = arch_getcls()->context;
 	
 	alloc_init();
 
@@ -82,6 +96,8 @@ void kmain(){
 
 	smp_init();
 
+	sched_runinit();
+
 	_panic("End of kmain()", 0);
 
 }

src/arch/x86_64/mmu.c

@@ -26,8 +26,8 @@ static void changeentry(uint64_t* entry, void* paddr, uint64_t flags){
 
 #define PTR_FLAGS ARCH_MMU_MAP_READ | ARCH_MMU_MAP_WRITE | ARCH_MMU_MAP_USER | ARCH_MMU_MAP_NOEXEC
 
-static void switchcontext(arch_mmu_tableptr context){
-	asm("mov %%rax, %%cr3" : : "a"(context));
+void arch_mmu_switchcontext(arch_mmu_tableptr context){
+	asm("mov %%rax, %%cr3" : : "a"(context) : "memory");
 }
 
 void* inv = NULL;
@@ -162,7 +162,21 @@ void arch_mmu_unmap(arch_mmu_tableptr context, void* vaddr){
 	
 }
 
-static arch_mmu_tableptr context; //boostrap context
+static arch_mmu_tableptr context; //boostrap context; also holds the kernel page tables
+
+arch_mmu_tableptr arch_mmu_newcontext(){
+	
+	arch_mmu_tableptr newcontext = pmm_alloc(1);
+	if(!newcontext)
+		return NULL;
+
+	memcpy((void*)newcontext + (size_t)limine_hhdm_offset, context, PAGE_SIZE);
+
+	memset((void*)newcontext + (size_t)limine_hhdm_offset, 0, PAGE_SIZE / 2);
+	
+	return newcontext;
+
+}
 
 void arch_mmu_init(){
 	
@@ -252,7 +266,7 @@ void arch_mmu_init(){
 	}
 	
 
-	switchcontext(context);
+	arch_mmu_switchcontext(context);
 	arch_getcls()->context->context = context;
 
 	printf("In bootstrap context\n");
@@ -261,7 +275,7 @@ void arch_mmu_init(){
 
 void arch_mmu_apinit(){
 	
-	switchcontext(context);
+	arch_mmu_switchcontext(context);
 
 	arch_getcls()->context = pmm_hhdmalloc(1);
 

src/arch/x86_64/regs.c

@@ -11,3 +11,16 @@ void arch_regs_setupkernel(arch_regs* regs, void* ip, void* stack, bool interrup
         regs->ss = 0x30;
         regs->rflags = interrupts ? 0x200 : 0;	
 }
+
+void arch_regs_setupuser(arch_regs* regs, void* ip, void* stack, bool interrupts){
+	regs->rip = ip;
+	regs->rsp = stack;
+	regs->cs = 0x38 | 3;
+	regs->ds = 0x40 | 3;
+        regs->es = 0x40 | 3;
+        regs->fs = 0x40 | 3;
+        regs->gs = 0x40 | 3;
+        regs->ss = 0x40 | 3;
+        regs->rflags = interrupts ? 0x200 : 0;
+
+}