term: Introduce quiet mode

CONFIG.md

@@ -82,6 +82,7 @@ Some keys take *URIs* as values; these are described in the next section.
 * `EDITOR_HIGHLIGHTING` - If set to `no`, syntax highlighting in the editor will be disabled. Defaults to `yes`.
 * `EDITOR_VALIDATION` - If set to `no`, the editor will not alert you about invalid keys / syntax errors. Defaults to `yes`.
 * `VERBOSE` - If set to `yes`, print additional information during boot. Defaults to not verbose.
+* `QUIET` - If set to `yes`, enable quiet mode, where all screen output except panics and important warnings is suppressed.
 * `RANDOMISE_MEMORY` - If set to `yes`, randomise the contents of RAM at bootup in order to find bugs related to non zeroed memory or for security reasons. This option will slow down boot time significantly.
 * `RANDOMIZE_MEMORY` - Alias of `RANDOMISE_MEMORY`.
 

stage23/entry.s2.c

@@ -44,6 +44,7 @@ static bool stage3_init(struct volume *part) {
     stage3_found = true;
 
     if (stage3->size != (size_t)limine_sys_size) {
+        term_textmode();
         print("limine.sys size incorrect.\n");
         return false;
     }
@@ -55,6 +56,7 @@ static bool stage3_init(struct volume *part) {
     fclose(stage3);
 
     if (memcmp(build_id_s2 + 16, build_id_s3 + 16, 20) != 0) {
+        term_textmode();
         print("limine.sys build ID mismatch.\n");
         return false;
     }
@@ -76,11 +78,11 @@ void entry(uint8_t boot_drive, int boot_from) {
     if (!a20_enable())
         panic("Could not enable A20 line");
 
+    term_notready();
+
     init_e820();
     init_memmap();
 
-    term_textmode();
-
     init_idt();
 
     disk_create_index();
@@ -98,14 +100,17 @@ void entry(uint8_t boot_drive, int boot_from) {
         }
     );
 
-    if (!stage3_found)
+    if (!stage3_found) {
+        term_textmode();
         print("\n"
               "!! Stage 3 file not found!\n"
               "!! Have you copied limine.sys to the root or /boot directories of\n"
               "!! one of the partitions on the boot device?\n\n");
+    }
 
-    if (!stage3_loaded)
+    if (!stage3_loaded) {
         panic("Failed to load stage 3.");
+    }
 
     __attribute__((noreturn))
     void (*stage3)(int boot_from) = (void *)stage3_addr;

stage23/entry.s3.c

@@ -63,6 +63,8 @@ void uefi_entry(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
         print("WARNING: Failed to disable watchdog timer!\n");
     }
 
+    term_notready();
+
     init_memmap();
 
     disk_create_index();
@@ -136,6 +138,9 @@ void stage3_common(void) {
         }
     );
 
+    char *quiet_str = config_get_value(NULL, 0, "QUIET");
+    quiet = quiet_str != NULL && strcmp(quiet_str, "yes") == 0;
+
     char *verbose_str = config_get_value(NULL, 0, "VERBOSE");
     verbose = verbose_str != NULL && strcmp(verbose_str, "yes") == 0;
 

stage23/lib/blib.h

@@ -32,7 +32,7 @@ extern struct volume *boot_volume;
 extern bool stage3_loaded;
 #endif
 
-extern bool verbose;
+extern bool verbose, quiet;
 
 bool parse_resolution(size_t *width, size_t *height, size_t *bpp, const char *buf);
 

stage23/lib/blib.s2.c

@@ -4,6 +4,7 @@
 #include <lib/print.h>
 
 bool verbose = true;
+bool quiet = false;
 
 uint8_t bcd_to_int(uint8_t val) {
     return (val & 0x0f) + ((val & 0xf0) >> 4) * 10;

stage23/lib/panic.s2.c

@@ -15,6 +15,8 @@ __attribute__((noreturn)) void panic(const char *fmt, ...) {
 
     va_start(args, fmt);
 
+    quiet = false;
+
     if (term_backend == NOT_READY) {
 #if bios == 1
         term_textmode();

stage23/lib/term.c

@@ -14,11 +14,15 @@ void term_deinit(void) {
             gterm_deinit();
     }
 
-    term_backend = NOT_READY;
+    term_notready();
 }
 
 void term_vbe(size_t width, size_t height) {
-    term_backend = NOT_READY;
+    term_notready();
+
+    if (quiet) {
+        return;
+    }
 
     if (!gterm_init(&term_rows, &term_cols, width, height)) {
 #if bios == 1

stage23/lib/term.h

@@ -48,6 +48,7 @@ void term_reinit(void);
 void term_deinit(void);
 void term_vbe(size_t width, size_t height);
 void term_textmode(void);
+void term_notready(void);
 void term_putchar(uint8_t c);
 void term_write(uint64_t buf, uint64_t count);
 
@@ -95,12 +96,10 @@ extern void (*term_callback)(uint64_t, uint64_t, uint64_t, uint64_t);
 extern bool term_autoflush;
 
 inline void reset_term(void) {
-    if (term_backend != NOT_READY) {
-        term_autoflush = true;
-        enable_cursor();
-        clear(true);
-        term_double_buffer_flush();
-    }
+    term_autoflush = true;
+    enable_cursor();
+    clear(true);
+    term_double_buffer_flush();
 }
 
 #endif

stage23/lib/term.s2.c

@@ -16,6 +16,66 @@ int term_backend = NOT_READY;
 size_t term_rows, term_cols;
 bool term_runtime = false;
 
+static void notready_raw_putchar(uint8_t c) {
+    (void)c;
+}
+static void notready_clear(bool move) {
+    (void)move;
+}
+static void notready_void(void) {}
+static void notready_set_cursor_pos(size_t x, size_t y) {
+    (void)x; (void)y;
+}
+static void notready_get_cursor_pos(size_t *x, size_t *y) {
+    *x = 0;
+    *y = 0;
+}
+static void notready_size_t(size_t n) {
+    (void)n;
+}
+static bool notready_disable(void) {
+    return false;
+}
+static void notready_move_character(size_t a, size_t b, size_t c, size_t d) {
+    (void)a; (void)b; (void)c; (void)d;
+}
+static uint64_t notready_context_size(void) {
+    return 0;
+}
+static void notready_uint64_t(uint64_t n) {
+    (void)n;
+}
+
+void term_notready(void) {
+    term_backend = NOT_READY;
+
+    raw_putchar = notready_raw_putchar;
+    clear = notready_clear;
+    enable_cursor = notready_void;
+    disable_cursor = notready_disable;
+    set_cursor_pos = notready_set_cursor_pos;
+    get_cursor_pos = notready_get_cursor_pos;
+    set_text_fg = notready_size_t;
+    set_text_bg = notready_size_t;
+    set_text_fg_bright = notready_size_t;
+    set_text_bg_bright = notready_size_t;
+    set_text_fg_default = notready_void;
+    set_text_bg_default = notready_void;
+    scroll_disable = notready_disable;
+    scroll_enable = notready_void;
+    term_move_character = notready_move_character;
+    term_scroll = notready_void;
+    term_swap_palette = notready_void;
+    term_double_buffer_flush = notready_void;
+    term_context_size = notready_context_size;
+    term_context_save = notready_uint64_t;
+    term_context_restore = notready_uint64_t;
+    term_full_refresh = notready_void;
+
+    term_rows = 100;
+    term_cols = 100;
+}
+
 void (*raw_putchar)(uint8_t c);
 void (*clear)(bool move);
 void (*enable_cursor)(void);
@@ -90,11 +150,16 @@ void term_reinit(void) {
     g_select = 0;
     charsets[0] = CHARSET_DEFAULT;
     charsets[1] = CHARSET_DEC_SPECIAL;
+    term_autoflush = true;
 }
 
 #if bios == 1
 void term_textmode(void) {
-    term_backend = NOT_READY;
+    term_notready();
+
+    if (quiet) {
+        return;
+    }
 
     init_vga_textmode(&term_rows, &term_cols, true);
 

stage23/protos/stivale2.c

@@ -456,6 +456,8 @@ failed_to_load_header_section:
     struct stivale2_header_tag_terminal *terminal_hdr_tag = get_tag(&stivale2_hdr, STIVALE2_HEADER_TAG_TERMINAL_ID);
 
     if (bits == 64 && terminal_hdr_tag != NULL) {
+        quiet = false;
+
         if (bios &&
           ((avtag == NULL && hdrtag == NULL) || (avtag != NULL && preference == 1))) {
             term_textmode();