Added direct acces to video memory from userland.std_c_userland

Next : same for keyboard ; move VT handling to userland.
Consequence : a foreground app has total control over I/O.
Next : implement sockets & a userland console multiplexer.

1 files changed, 29 insertions, 19 deletions

diff --git a/src/user/app/test/main.c b/src/user/app/test/main.c
index 2c42cf8..d9b6332 100644
--- a/src/user/app/test/main.c
+++ b/src/user/app/test/main.c
@@ -1,14 +1,34 @@
 #include <tce/syscall.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <sched.h>
 
 int threads = 1;
 
+mutex_t d_mutex = MUTEX_UNLOCKED;
+int d_pos = 0;
+int vgatxt = -1;
+
+void display_it(char k) {
+	mutex_lock(&d_mutex);
+
+	// just display some stuff on /.dev/vgatxt
+	if (vgatxt == -1) {
+		vgatxt = open("/.dev/vgatxt", FM_READ | FM_WRITE);
+	}
+	uint16_t c = k | (4 << 8);
+	write(vgatxt, 2 * d_pos, 2, (char*)&c);
+
+	d_pos++;
+
+	mutex_unlock(&d_mutex);
+}
+
 void thread_cascade(void* d) {
 	int n = (int)d;
 
 	char *v = malloc(2048);
-	if (!v) printk("!");
+	if (!v) display_it('!');
 
 	if (d == 0) {
 		//printk("{#} 0 cascade element started => end\n");
@@ -16,21 +36,21 @@ void thread_cascade(void* d) {
 	} else {
 		if (n < 0) {
 			//printk("{#} - cascade element started\n");
-			printk("-");
+			display_it('-');
 			n = 0 - n;
 		} else {
 			//printk("{#} + cascade element started\n");
-			printk("+");
+			display_it('+');
 		}
 		//printk("{#} FORK + ...\n");
-		printk(">");
+		display_it('>');
 		threads += 2;
 		thread_new(thread_cascade, (void*)(n - 1));
 		//printk("{#} FORK - ...\n");
-		printk("<");
+		display_it('<');
 		thread_new(thread_cascade, (void*)(1 - n));
 		//printk("{#} Thread cascade element finished.\n");
-		printk(".");
+		display_it('.');
 	}
 
 	free(v);
@@ -40,25 +60,15 @@ void thread_cascade(void* d) {
 
 void useless_thread(void* d) {
 	while(1) {
-		printk("~");
+		display_it('~');
 		schedule();
 	}
 }
 
 int main(int argc, char** args) {
-	char**a;
-	if (args != 0) {
-		printk("(test) args");
-		for (a = args; *a != 0; a++) {
-			printk(" - ");
-			printk(*a);
-		}
-		printk("\n");
-	}
-
-	printk("(test) Creating thread cascade (total 2**6 = 64 threads)\n");
+	printk("(test) Creating thread cascade (total 2**7 = 128 threads)\n");
 	thread_new(useless_thread, 0);
-	thread_new(thread_cascade, (void*)6);
+	thread_new(thread_cascade, (void*)7);
 
 	while (1) {
 		schedule();