apm and smbios stubs, get_char can now wait for printable

src/kernel/keyb.asm

@@ -26,7 +26,7 @@ get_key:;uint16_t get_key(void)
 
   xor eax, eax
 
-  ;return in ax
+  ;TODO: return in ax
 
   leave
   ret

src/kernel/keyb.c

@@ -21,7 +21,13 @@ OF THIS SOFTWARE.
 #include "vga.h"
 
 uint8_t get_char(bool echo) {
-  uint8_t ch = poll_port(COM2) ? read_byte(COM2) : 0;//TODO: from get_key
+  uint8_t ch = 0;
+  do 
+    if (poll_port(COM2))
+      ch = read_byte(COM2);
+    else
+      ;//TODO: get from get_key
+  while (!ch);
   if (echo)
     put_char(ch);
   return ch;

src/kernel/main.c

@@ -123,7 +123,24 @@ struct elf_tag {
 struct module_tag {
   uint32_t start;
   uint32_t end;
-  uint8_t argument[1];
+} __attribute__ ((__packed__));
+
+struct smbios_tag {
+  uint8_t major_version;
+  uint8_t minor_version;
+  uint16_t padding[3];
+} __attribute__ ((__packed__));
+
+struct apm_table {
+  uint16_t version;
+  uint16_t cs_32;
+  uint32_t ip_32;
+  uint16_t cs_16;
+  uint16_t ds_16;
+  uint16_t flags;
+  uint16_t cs_32_length;
+  uint16_t cs_16_length;
+  uint16_t ds_16_lenth;
 } __attribute__ ((__packed__));
 
 struct boot_device_tag boot_device;
@@ -169,9 +186,9 @@ uint32_t main(void) {
       put_32_hex(module->start);
       put_sz(" - ");
       put_32_hex(module->end - 1);
-      if (*module->argument) {
+      if (*(uint8_t *)(module + 1)) {
         put_sz("\n    Argument: ");
-        put_sz(module->argument);
+        put_sz((uint8_t *)(module + 1));
       }
       break;
 
@@ -355,6 +372,24 @@ uint32_t main(void) {
       break;
     }
 
+    case APM_TABLE: {
+      struct apm_table *table = (struct apm_table *)(tag_pointer + 1);
+      put_sz(": APM table\n    v");
+      put_16_dec(table->version);
+      //TODO
+      break;
+    }
+
+    case SMBIOS_TABLE: {
+      struct smbios_tag *tag = (struct smbios_tag *)(tag_pointer + 1);
+      put_sz(": SMBIOS\n    v");
+      put_8_dec(tag->major_version);
+      put_char('.');
+      put_8_dec(tag->minor_version);
+      //TODO
+      break;
+    }
+
     case IMAGE_BASE_ADDR:
       put_sz(": image address\n    0x");
       put_32_hex(text_base = *(uint32_t *)(tag_pointer + 1));

src/kernel/vga.c

@@ -109,6 +109,20 @@ void put_32_dec(uint32_t n) {
     put_char('0');
 }
 
+void put_16_dec(uint16_t n) {
+  if (n) {
+    bool sig = false;
+    for (uint16_t m = 10000; m; m /= 10) {
+      if (((n / m) % 10) || sig) {
+        sig = true;
+        put_char((uint8_t)'0' + (n / m) % 10);
+      }
+    }
+  }
+  else
+    put_char('0');
+}
+
 void put_8_dec(uint8_t n) {
   if (n) {
     bool sig = false;

src/kernel/vga.h

@@ -29,6 +29,7 @@ void put_32_hex(uint32_t n);
 void put_16_hex(uint16_t n);
 void put_8_hex(uint8_t n);
 void put_32_dec(uint32_t n);
+void put_16_dec(uint16_t n);
 void put_8_dec(uint8_t n);
 void move_cursor(uint8_t col, uint8_t row);
 void set_color(uint8_t c);