Serial port used for writing kernel output.

Project: give total control to userland over display/input devices.

11 files changed, 143 insertions, 76 deletions

diff --git a/src/kernel/core/kmain.cpp b/src/kernel/core/kmain.cpp
index 23b62e3..fdfb70a 100644
--- a/src/kernel/core/kmain.cpp
+++ b/src/kernel/core/kmain.cpp
@@ -27,6 +27,8 @@
 extern "C" void kmain(multiboot_info_t* mbd, int32_t magic) {
 	ASSERT(magic == MULTIBOOT_BOOTLOADER_MAGIC);
 
+	dbg_printf("\n------------------------------\nT/CE kernel booting, serial debugging enabled.\n");
+
 	mem_placementAddr = ((size_t)&end & 0xFFFFF000) + 0x1000;
 	mbd->cmdline += K_HIGHHALF_ADDR; mbd->mods_addr += K_HIGHHALF_ADDR;
 	module_t *mods = (module_t*)mbd->mods_addr;
@@ -42,6 +44,7 @@ extern "C" void kmain(multiboot_info_t* mbd, int32_t magic) {
 	// Init memory managment functions
 	idt_init();
 	size_t totalRam = ((mbd->mem_upper + mbd->mem_lower) * 1024);
+	dbg_printf("Total ram: %p\n", totalRam);
 	paging_init(totalRam);
 	gdt_init();
 	paging_cleanup();
@@ -56,36 +59,29 @@ extern "C" void kmain(multiboot_info_t* mbd, int32_t magic) {
 	text_display = new vgatxt(dot_dev);
 	dot_dev->add_child("vgatxt", text_display);
 
-	ke_vt = new vt(dot_ui, 80, 25);
-	dot_ui->add_child("klog", ke_vt);
-	ke_vt->outputTo(text_display);
 	home_vt = new vt(dot_ui, 80, 25);
 	dot_ui->add_child("home", home_vt);
+	home_vt->outputTo(text_display);
 	dot_ui->add_child("vt1", new vt(dot_ui, 80, 25));
 	dot_ui->add_child("vt2", new vt(dot_ui, 80, 25));
 	dot_ui->add_child("vt3", new vt(dot_ui, 80, 25));
 	dot_ui->add_child("vt4", new vt(dot_ui, 80, 25));
 
 	// Say hello
-	ke_vt->fgcolor = TC_LIGHTGRAY;
-	*ke_vt << "Hello. This is ";
-	ke_vt->fgcolor = TC_WHITE; 		*ke_vt << K_OS_NAME;
-	ke_vt->fgcolor = TC_LIGHTGRAY; 	*ke_vt << " version ";
-	ke_vt->fgcolor = TC_WHITE; 		*ke_vt << K_OS_VER;
-	ke_vt->fgcolor = TC_LIGHTGRAY;	*ke_vt << " codename '";
-	ke_vt->fgcolor = TC_WHITE;		*ke_vt << K_OS_CODENAME;
-	ke_vt->fgcolor = TC_LIGHTGRAY;	*ke_vt << "'. Enjoy!\n";
+	dbg_printf("%s version %s condename %s\n", K_OS_NAME, K_OS_VER, K_OS_CODENAME);
 
 	// Init devices
 	kbd = new ps2kbd(dot_dev);
 	dot_dev->add_child("ps2kbd", kbd);
-	kbd->outputTo(ke_vt);
+	kbd->outputTo(home_vt);
 
 	// Load modules
-	*ke_vt << "Loading modules :\n";
+	dbg_printf("Loading modules :\n");
 	for (unsigned i = 0; i < mbd->mods_count; i++) {
 		char* cmd = (char*)mods[i].string;
-		*ke_vt << " * " << cmd << " \t";
+
+		dbg_printf(" * %s \t", cmd);
+
 		if (elf_check((uint8_t*)mods[i].mod_start) == 0) {
 
 			char *args[16] = { cmd, 0 };
@@ -107,10 +103,10 @@ extern "C" void kmain(multiboot_info_t* mbd, int32_t magic) {
 
 			process *pr = elf_exec((uint8_t*)mods[i].mod_start, PL_USER, args);	// todo add args
 			if (pr == 0) {
-				*ke_vt << "Error loading\n";
+				dbg_printf("Error loading\n");
 			} else {
-				pr->fd.set(0, ke_vt);
-				*ke_vt << "OK, pid=" << (int)pr->pid << "\n";
+				pr->fd.set(0, home_vt);
+				dbg_printf("OK, pid = %d\n", pr->pid);
 			}
 		} else if (initrd_check((uint8_t*)mods[i].mod_start) == 0) {
 			vdir* fs = new vdir(root);
@@ -121,16 +117,16 @@ extern "C" void kmain(multiboot_info_t* mbd, int32_t magic) {
 					if (*i == '/' || *i == ' ') name = i + 1;
 				}
 				root->add_child(name, fs);
-				*ke_vt << "OK, initrd as /" << name << "/\n";
+				dbg_printf("OK,initrd as /%s/\n", name);
 			} else {
-				*ke_vt << "initrd but error " << e << "\n";
+				dbg_printf("initrd, but error %d\n", e);
 			}
 		} else {
-			*ke_vt << "Invalid file, neither ELF nor initrd.\n";
+			dbg_printf("invalid, neither ELF nor initrd.\n");
 		}
 	}
 
-	*ke_vt << "Giving control to userland processes.\n\n";
+	dbg_printf("Giving control to userland processes.\n");
 	sti();
 	schedule();
 	PANIC("Should never happen. Something probably went wrong with multitasking.");
diff --git a/src/kernel/core/main.cpp b/src/kernel/core/main.cpp
deleted file mode 100644
index e69de29..0000000
--- a/src/kernel/core/main.cpp
+++ /dev/null
diff --git a/src/kernel/core/sys.cpp b/src/kernel/core/sys.cpp
index 01a3c20..e27e0a6 100644
--- a/src/kernel/core/sys.cpp
+++ b/src/kernel/core/sys.cpp
@@ -31,8 +31,7 @@ uint16_t inw(uint16_t port) {
 void stack_trace(size_t bp) {
 	uint32_t *stack = (uint32_t*)bp, i;
 	for (i = 0; i < 5 && (size_t)stack > K_HIGHHALF_ADDR && (size_t)stack < (bp + 0x8000); i++) {
-		*ke_vt << " | " << (size_t)stack;
-		*ke_vt << "\tnext:" << stack[0] << "\t\tret:" << stack[1] << "    \n";
+		dbg_printf(" | %p\tnext:%p\t\tret:%p\n", stack, stack[0], stack[1]);
 		stack = (uint32_t*)stack[0];
 	}
 }
@@ -40,29 +39,21 @@ void stack_trace(size_t bp) {
 /*	For internal use only. Used by panic and panic_assert. */
 static void panic_do(char* file, int line) {
 	asm volatile("cli;");
-	*ke_vt << "    \n File:\t\t" << file << ":" << line;
-	*ke_vt << "    \nTrace:    \n";
+	dbg_printf("File:\t\t%s:%i\n", file, line);
+	dbg_printf("Trace:\n");
 	size_t bp; asm volatile("mov %%ebp,%0" : "=r"(bp)); stack_trace(bp);
-	*ke_vt << "\n\t\tSystem halted -_-'";
+	dbg_printf("\t\tSystem halted -_-'\n");
 	asm volatile("hlt");
 }
 
 /*	These functions stop the system, reporting an error message, because something bad happenned. */
 void panic(char* message, char* file, int line) {
-	ke_vt->fgcolor = TC_WHITE;
-	ke_vt->bgcolor = TC_BLUE;
-	ke_vt->outputTo(text_display);
-	*ke_vt << "  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  ";
-	*ke_vt <<  "\nPANIC:\t" << message;
+	dbg_printf("#### PANIC ####\n");
 	panic_do(file, line);
 }
 
 void panic_assert(char* assertion, char* file, int line) {
-	ke_vt->fgcolor = TC_WHITE;
-	ke_vt->bgcolor = TC_RED;
-	ke_vt->outputTo(text_display);
-	*ke_vt << "  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  ";
-	*ke_vt << "\nASSERT FAILED:\t" << assertion;
+	dbg_printf("#### ASSERT FAILED ####\n");
 	panic_do(file, line);
 }
 
@@ -79,3 +70,87 @@ void sti() {
 	if (if_locks > 0) if_locks--;
 	if (if_locks == 0) asm volatile("sti");
 }
+
+// Serial debugging
+
+#define SER_PORT 0x3F8		// COM1
+static int ser_init = 1;
+
+void ser_putc(const char c) {
+	if (ser_init) {
+		outb(SER_PORT + 1, 0x00);		// disable interrupts
+		outb(SER_PORT + 3, 0x80);		// set baud rate
+		outb(SER_PORT + 0, 0x03);		// set divisor to 3 (38400 baud)
+		outb(SER_PORT + 1, 0x00);
+		outb(SER_PORT + 3, 0x03);		// 8 bits, no parity, one stop bit
+		outb(SER_PORT + 2, 0xC7);		// enable FIFO, clear them, with 14-byte threshold
+		ser_init = 0;
+	}
+
+	while (!(inb(SER_PORT + 5) & 0x20));
+	outb(SER_PORT, c);
+}
+
+void ser_puts(const char *c) {
+	while (*c) {
+		ser_putc(*c);
+		c++;
+	}
+}
+
+void ser_printf(const char *format, ...) {
+	va_list ap;
+	va_start(ap, format);
+
+	while (*format) {
+		if (*format == '%') {
+			format++;
+			if (*format == 'd' || *format == 'i') {
+				// Output DEC
+				int v = va_arg(ap, int);
+				if (v == 0) {
+					ser_putc('0');
+				} else {
+					if (v < 0) {
+						ser_putc('-');
+						v = -v;
+					}
+					char s[20];
+					char *b = s + 19;
+					*b = 0;
+					while (v) {
+						*(--b) = '0' + (v % 10);
+						v /= 10;
+					}
+					ser_puts(b);
+				}
+			} else if (*format == 'p') {
+				// Output HEX
+				uint32_t v = va_arg(ap, uint32_t);
+				const char *digits = "0123456789ABCDEF";
+				char s[11];
+				s[0] = '0';
+				s[1] = 'x';
+				s[10] = 0;
+				for (int i = 0; i < 8; i++) {
+					s[9 - i] = digits[v % 16];
+					v /= 16;
+				}
+				ser_puts(s);
+			} else if (*format == 's') {
+				// Output STR
+				const char *s = va_arg(ap, const char*);
+				ser_puts(s);
+			} else if (*format == 'c') {
+				// Output CHR
+				char v = va_arg(ap, int);
+				ser_putc(v);
+			}
+			format++;
+		} else {
+			ser_putc(*(format++));
+		}
+	}
+
+	va_end(ap);
+}
diff --git a/src/kernel/core/sys.h b/src/kernel/core/sys.h
index f429b44..a4e1680 100644
--- a/src/kernel/core/sys.h
+++ b/src/kernel/core/sys.h
@@ -3,6 +3,7 @@
 
 #include "types.h"
 
+
 void outb(uint16_t port, uint8_t value);
 void outw(uint16_t port, uint16_t value);
 uint8_t inb(uint16_t port);
@@ -20,4 +21,12 @@ void panic_assert(char* assertion, char* file, int line);
 void cli();	//lock
 void sti();	//unlock
 
+// Serial debugging
+
+void ser_putc(const char c);
+void ser_puts(const char *c);
+void ser_printf(const char *format, ...);
+#define dbg_printf ser_printf
+
+
 #endif
diff --git a/src/kernel/lib/std.cpp b/src/kernel/lib/std.cpp
index c25f59c..ef93509 100644
--- a/src/kernel/lib/std.cpp
+++ b/src/kernel/lib/std.cpp
@@ -5,9 +5,7 @@
 int errno = 0;
 
 void abort() {
-	*ke_vt << "\n\n ABORT - errno: ";
-	*ke_vt << errno;
-	*ke_vt <<"\n";
+	dbg_printf("ABORT - errno %d\n", errno);
 	PANIC("abort() called, probably a memory manager failure.");
 }
 
diff --git a/src/kernel/mem/paging.cpp b/src/kernel/mem/paging.cpp
index 5c5a929..436c888 100644
--- a/src/kernel/mem/paging.cpp
+++ b/src/kernel/mem/paging.cpp
@@ -136,22 +136,16 @@ uint32_t paging_fault(registers *regs) {
 	}
 
 	if (seg == 0) {
-		node *n = current_thread->process->fd.at(0);
-		vt *vt = (n && n->as_vt() ? n->as_vt() : ke_vt);
-
-		vt->writeStr("\n");
-		vt->writeStr("[ke:"); vt->writeStr(__FILE__); vt->writeStr(":");
-		vt->writeDec(__LINE__); vt->writeStr("] ");
-		vt->writeStr("Unhandled Page Fault");
-
-		*vt << "\n\tPID: " << (int)current_thread->process->pid;
-		*vt << "\n\tcr2: " << addr;
-		*vt << "\n\tflags: ";
-		if (regs->err_code & 0x1) *vt << "present ";
-		if (regs->err_code & 0x2) *vt << "write ";
-		if (regs->err_code & 0x4) *vt << "user ";
-		if (regs->err_code & 0x8) *vt << "rsvd ";
-		if (regs->err_code & 0x10) *vt << "opfetch ";
+		dbg_printf("[ke:%s:%d] Unhandled page fault\n", __FILE__, __LINE__);
+
+		dbg_printf("\tPID: %d\n", current_thread->process->pid);
+		dbg_printf("\tcr2: %p\n", addr);
+		dbg_printf("\tflags:");
+		if (regs->err_code & 0x1) dbg_printf(" present");
+		if (regs->err_code & 0x2) dbg_printf(" write");
+		if (regs->err_code & 0x4) dbg_printf(" user");
+		if (regs->err_code & 0x8) dbg_printf(" rsvd");
+		if (regs->err_code & 0x10) dbg_printf(" opfetch");
 		return 1;
 	}
 	return 0;
diff --git a/src/kernel/task/idt.cpp b/src/kernel/task/idt.cpp
index 94a31b7..782bbd6 100644
--- a/src/kernel/task/idt.cpp
+++ b/src/kernel/task/idt.cpp
@@ -80,9 +80,7 @@ static struct irq_waiter {
 extern "C" void idt_isrHandler(registers regs) {
 	if (regs.int_no != 14 || paging_fault(&regs)) {
 		if (tasking_handleException(&regs) == 0) {
-			*ke_vt << "\nREALLY BAD THIS TIME\t\tUnhandled exception\t#";
-			*ke_vt << regs.int_no;
-			*ke_vt << "\t@" << regs.eip;
+			dbg_printf("REALLY BAD THIS TIME: Unhandled exception #%d @%p\n", regs.int_no, regs.eip);
 			PANIC("Unhandled Exception");
 		}
 	}
diff --git a/src/kernel/task/syscall.cpp b/src/kernel/task/syscall.cpp
index 9e7c089..a3074b8 100644
--- a/src/kernel/task/syscall.cpp
+++ b/src/kernel/task/syscall.cpp
@@ -33,7 +33,7 @@ CALL2(process_waitpid, waitpid_sc);
 CALL1V(close, close_sc);
 
 static void printk_sc(registers *r) {
-	ke_vt->writeStr((char*)r->ebx);
+	dbg_printf("%s", (char*)r->ebx);
 }
 
 static void thread_new_sc(registers* r) {
diff --git a/src/kernel/task/task.cpp b/src/kernel/task/task.cpp
index 2af0441..2ad5447 100644
--- a/src/kernel/task/task.cpp
+++ b/src/kernel/task/task.cpp
@@ -104,40 +104,36 @@ void schedule() {
 /*	Called when an exception happens. Provides a stack trace if it was in kernel land.
 	Ends the thread for most exceptions, ends the whole process for page faults. */
 uint32_t tasking_handleException(registers *regs) {
-	node *n = current_thread->process->fd.at(0);
-	vt *vt = (n && n->as_vt() ? n->as_vt() : ke_vt);
-
 	if (current_thread == 0) return 0;	//No tasking yet
 	
-	vt->writeStr("\n");
-	vt->writeStr("[ke:"); vt->writeStr(__FILE__); vt->writeStr(":");
-	vt->writeDec(__LINE__); vt->writeStr("] ");
-	vt->writeStr("Exception: ");
+	dbg_printf("[ke:%s:%d] Exception: ", __FILE__, __LINE__);
 
 	char *exception_messages[] = {"Division By Zero","Debug","Non Maskable Interrupt","Breakpoint",
     "Into Detected Overflow","Out of Bounds","Invalid Opcode","No Coprocessor", "Double Fault",
     "Coprocessor Segment Overrun","Bad TSS","Segment Not Present","Stack Fault","General Protection Fault",
     "Page Fault","Unknown Interrupt","Coprocessor Fault","Alignment Check","Machine Check"};
-	*vt << exception_messages[regs->int_no];;
-	*vt << "\n\tPID: " << (int)current_thread->process->pid;
-	*vt << "\n\teip: " << regs->eip;
+
+	dbg_printf("%s\n", exception_messages[regs->int_no]);
+	dbg_printf("\tPID: %d\n", current_thread->process->pid);
+	dbg_printf("\teip: %p\n", regs->eip);
+	
 
 	if (regs->eip >= K_HIGHHALF_ADDR) {
-		*vt << "\n\tException in kernel.";
+		dbg_printf("\tException in kernel\n");
 		stack_trace(regs->ebp);	// useless
 	}
-	*vt << "\n\tTrace:";
+	dbg_printf("\tTrace:\n");
 	uint32_t *stack = (uint32_t*)regs->ebp, i;
 	for (i = 0; i < 7 && (size_t)stack < (regs->ebp + 0x4000) && (size_t) stack >= regs->ebp; i++) {
-		*vt << "\n\t  " << (size_t)stack << "    next: " << stack[0] << "    ret: " << stack[1];
+		dbg_printf("\t%p\tnext: %p\tret: %p\n", stack, stack[0], stack[1]);
 		stack = (uint32_t*)stack[0];
 	}
 
 	if (regs->int_no == 14) {
-		*vt << "\n\tKilling process.\n";
+		dbg_printf("\tKilling process.\n");
 		thread_exit_stackJmp(EX_PAGEFAULT);
 	} else {
-		*vt << "\n\tKilling thread.\n";
+		dbg_printf("\tKilling thread.\n");
 		thread_exit_stackJmp(EX_EXCEPTION);
 	}
 	PANIC("This should never have happened. Please report this.");
diff --git a/src/kernel/ui/vt.h b/src/kernel/ui/vt.h
index 8a169b4..ee991da 100644
--- a/src/kernel/ui/vt.h
+++ b/src/kernel/ui/vt.h
@@ -54,7 +54,8 @@ class vt : public node {
 	virtual int link(node* to, int mode);
 };
 
-extern vt *ke_vt, *home_vt;
+//extern vt *ke_vt;
+extern vt *home_vt;
 #define NL ke_vt->writeStr("\n");
 #define TAB ke_vt->writeStr("\t");
 #define WHERE { ke_vt->writeStr("(ke:");	\
diff --git a/src/kernel/vfs/vdir.h b/src/kernel/vfs/vdir.h
index 6aacc2f..47d7733 100644
--- a/src/kernel/vfs/vdir.h
+++ b/src/kernel/vfs/vdir.h
@@ -14,7 +14,7 @@ struct vdir_child {
 	}
 
 	virtual ~vdir_child() {
-		free(name);
+		kfree(name);
 	}
 };