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.

5 files changed, 42 insertions, 3 deletions

diff --git a/src/kernel/dev/display.h b/src/kernel/dev/display.h
index ec67e7e..963b5e6 100644
--- a/src/kernel/dev/display.h
+++ b/src/kernel/dev/display.h
@@ -22,7 +22,6 @@ class display : public node {
 	vt *connected_vt;
 
 	display(node* parent) : node(parent, FT_DEV) {
-		dev_type = DT_DISPLAY;
 		connected_vt = 0;
 	}
 	virtual ~display() {}
diff --git a/src/kernel/dev/keyboard.cpp b/src/kernel/dev/keyboard.cpp
index 3f54b99..af4c380 100644
--- a/src/kernel/dev/keyboard.cpp
+++ b/src/kernel/dev/keyboard.cpp
@@ -77,7 +77,7 @@ static keymap default_km = {
 };
 
 keyboard::keyboard(node *parent) : node(parent, FT_DEV) {
-	dev_type = DT_KEYBOARD;
+	dev_type = DT_PCKBD;
 
 	km = &default_km;
 	num = true;
diff --git a/src/kernel/dev/ps2keyboard.cpp b/src/kernel/dev/ps2keyboard.cpp
index 31cd75f..c7fc322 100644
--- a/src/kernel/dev/ps2keyboard.cpp
+++ b/src/kernel/dev/ps2keyboard.cpp
@@ -53,3 +53,4 @@ void ps2kbd::kbdIrq() {
 		escaped = false;
 	}
 }
+
diff --git a/src/kernel/dev/vgatxt.cpp b/src/kernel/dev/vgatxt.cpp
index eb57eb9..7abbaf9 100644
--- a/src/kernel/dev/vgatxt.cpp
+++ b/src/kernel/dev/vgatxt.cpp
@@ -4,11 +4,12 @@
 #include <mem/mem.h>
 
 static uint16_t *video_memory = (uint16_t*)((size_t)K_HIGHHALF_ADDR + 0xB8000);
+#define VIDMEM_SIZE (80 * 25 * 2)
 
 vgatxt *text_display;
 
 vgatxt::vgatxt(node *parent) : display(parent) {
-	// nothing to do, really
+	dev_type = DT_VGATXT;
 }
 
 int vgatxt::text_w() {
@@ -52,3 +53,34 @@ void vgatxt::text_scroll(int n, uint8_t fgcolor, uint8_t bgcolor) {
 		// TODO
 	}
 }
+
+
+// Operations as a FS node
+
+size_t vgatxt::get_size() {		// size as a node of the filesystem
+	return (text_w() << 16) + text_h();
+}
+
+int vgatxt::read(size_t offset, size_t len, char *buffer) {
+	if (offset > VIDMEM_SIZE) return 0;
+	if (offset + len > VIDMEM_SIZE) len = VIDMEM_SIZE - offset;
+
+	char *vm = (char*)video_memory;
+	memcpy(buffer, vm + offset, len);
+	return len;
+}
+
+int vgatxt::write(size_t offset, size_t len, char *buffer) {
+	if (offset > VIDMEM_SIZE) return 0;
+	if (offset + len > VIDMEM_SIZE) len = VIDMEM_SIZE - offset;
+
+	char *vm = (char*)video_memory;
+	memcpy(vm + offset, buffer, len);
+	return len;
+}
+
+int vgatxt::dev_control(char *data) {
+	uint16_t *d = (uint16_t*)data;
+	text_setcsr(d[0], d[1], d[2] != 0);
+	return 0;
+}
diff --git a/src/kernel/dev/vgatxt.h b/src/kernel/dev/vgatxt.h
index 550d4ba..bed743e 100644
--- a/src/kernel/dev/vgatxt.h
+++ b/src/kernel/dev/vgatxt.h
@@ -10,6 +10,13 @@ class vgatxt : public display {
 	vgatxt(node *parent);
 	virtual ~vgatxt() {}
 
+	// as a FS node
+	virtual size_t get_size();
+	virtual int read(size_t offset, size_t len, char *buffer);
+	virtual int write(size_t offset, size_t len, char *buffer);
+	virtual int dev_control(char *data);
+
+	// as a display
 	virtual int text_w();
 	virtual int text_h();
 	virtual void text_setcsr(int l, int c, bool visible);