video: Fix missing terminal deinitialisation before changing into final video mode

stage23/lib/term.c

@@ -7,6 +7,8 @@
 #include <lib/gterm.h>
 
 void term_vbe(uint32_t *colours, int margin, int margin_gradient, struct image *background) {
+    term_backend = NOT_READY;
+
     if (!gterm_init(&term_rows, &term_cols, colours, margin, margin_gradient, background)) {
 #if defined (bios)
         // Failed to set VBE properly, default to text mode

stage23/lib/term.h

@@ -21,6 +21,8 @@ void term_vbe(uint32_t *colours, int margin, int margin_gradient, struct image *
 void term_textmode(void);
 void term_write(const char *buf, size_t count);
 
+void term_deinit(void);
+
 extern int term_rows, term_cols;
 
 enum {

stage23/lib/term.s2.c

@@ -27,6 +27,8 @@ int term_rows, term_cols;
 
 #if defined (bios)
 void term_textmode(void) {
+    term_backend = NOT_READY;
+
     init_vga_textmode(&term_rows, &term_cols, true);
 
     raw_putchar    = text_putchar;
@@ -45,6 +47,10 @@ void term_textmode(void) {
 }
 #endif
 
+void term_deinit(void) {
+    term_backend = NOT_READY;
+}
+
 static void term_putchar(uint8_t c);
 
 void term_write(const char *buf, size_t count) {

stage23/protos/linux.c

@@ -482,6 +482,8 @@ void linux_load(char *config, char *cmdline) {
     // Video
     ///////////////////////////////////////
 
+    term_deinit();
+
     mtrr_restore();
 
     struct screen_info *screen_info = &boot_params->screen_info;

stage23/protos/stivale.c

@@ -157,6 +157,8 @@ void stivale_load(char *config, char *cmdline) {
     stivale_struct.epoch = time();
     print("stivale: Current epoch: %U\n", stivale_struct.epoch);
 
+    term_deinit();
+
     if (stivale_hdr.flags & (1 << 0)) {
         int req_width  = stivale_hdr.framebuffer_width;
         int req_height = stivale_hdr.framebuffer_height;

stage23/protos/stivale2.c

@@ -261,6 +261,8 @@ void stivale2_load(char *config, char *cmdline, bool pxe, void *efi_system_table
     // Create framebuffer struct tag
     //////////////////////////////////////////////
     {
+    term_deinit();
+
     struct stivale2_header_tag_framebuffer *hdrtag = get_tag(&stivale2_hdr, STIVALE2_HEADER_TAG_FRAMEBUFFER_ID);
 
     if (hdrtag != NULL) {