Change of vterm handling logic on backend chardev input event (#40)

[lunaix-os.git] / lunaix-os / hal / gfxa / vga / vga_rawtty.c

diff --git a/lunaix-os/hal/gfxa/vga/vga_rawtty.c b/lunaix-os/hal/gfxa/vga/vga_rawtty.c
new file mode 100644 (file)
index 0000000..21fcd82
--- /dev/null
+++ b/lunaix-os/hal/gfxa/vga/vga_rawtty.c
@@ -0,0 +1,128 @@
+#include <klibc/string.h>
+#include <lunaix/spike.h>
+#include <lunaix/tty/tty.h>
+#include <stdint.h>
+#include <lunaix/owloysius.h>
+#include <lunaix/mm/pagetable.h>
+#include <lunaix/mm/mmio.h>
+
+#include <sys/port_io.h>
+
+vga_attribute* tty_vga_buffer;
+
+vga_attribute tty_theme_color = VGA_COLOR_BLACK;
+
+inline void
+tty_clear()
+{
+    asm volatile("rep stosw" ::"D"(tty_vga_buffer),
+                 "c"(TTY_HEIGHT * TTY_WIDTH),
+                 "a"(tty_theme_color)
+                 : "memory");
+}
+
+void
+tty_init(void* vga_buf)
+{
+    tty_vga_buffer = (vga_attribute*)vga_buf;
+
+    tty_clear();
+
+    port_wrbyte(0x3D4, 0x0A);
+    port_wrbyte(0x3D5, (port_rdbyte(0x3D5) & 0xC0) | 13);
+
+    port_wrbyte(0x3D4, 0x0B);
+    port_wrbyte(0x3D5, (port_rdbyte(0x3D5) & 0xE0) | 15);
+}
+
+void
+tty_set_cursor(u8_t x, u8_t y)
+{
+    if (x >= TTY_WIDTH || y >= TTY_HEIGHT) {
+        x = y = 0;
+    }
+    u32_t pos = y * TTY_WIDTH + x;
+    port_wrbyte(0x3D4, 14);
+    port_wrbyte(0x3D5, pos / 256);
+    port_wrbyte(0x3D4, 15);
+    port_wrbyte(0x3D5, pos % 256);
+}
+
+void
+tty_set_theme(vga_attribute fg, vga_attribute bg)
+{
+    tty_theme_color = (bg << 4 | fg) << 8;
+}
+
+void
+tty_flush_buffer(struct fifo_buf* buf)
+{
+    int x = 0, y = 0;
+
+    // Clear screen
+    tty_clear();
+
+    char chr;
+    while (fifo_readone_async(buf, (u8_t*)&chr)) {
+        switch (chr) {
+            case '\t':
+                x += 4;
+                break;
+            case '\n':
+                y++;
+                // fall through
+            case '\r':
+                x = 0;
+                break;
+            default:
+                *(tty_vga_buffer + x + y * TTY_WIDTH) =
+                    (tty_theme_color | chr);
+                (x)++;
+                break;
+        }
+
+        if (x >= TTY_WIDTH) {
+            x = 0;
+            y++;
+        }
+        if (y >= TTY_HEIGHT) {
+            y--;
+            break;
+        }
+    }
+
+    tty_set_cursor(x, y);
+}
+
+void
+tty_clear_line(int line_num)
+{
+    asm volatile("rep stosw" ::"D"(tty_vga_buffer + line_num * TTY_WIDTH),
+                 "c"(TTY_WIDTH),
+                 "a"(tty_theme_color)
+                 : "memory");
+}
+
+void
+tty_put_str_at(char* str, int x, int y)
+{
+    char c;
+    while ((c = (*str)) && y < TTY_HEIGHT) {
+        *(tty_vga_buffer + x + y * TTY_WIDTH) = c | tty_theme_color;
+        x++;
+        if (x >= TTY_WIDTH) {
+            y++;
+            x = 0;
+        }
+        str++;
+    }
+}
+
+static void
+vga_rawtty_init()
+{
+    // FIXME we should get rid of it at some point
+    tty_init((void*)ioremap(0xB8000, PAGE_SIZE));
+    tty_set_theme(VGA_COLOR_WHITE, VGA_COLOR_BLACK);
+}
+owloysius_fetch_init(vga_rawtty_init, on_earlyboot);
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