From 1f309e75b808f7f9576a3f60dbbe925d1e43a714 Mon Sep 17 00:00:00 2001
From: Benji Dial <Benji3.141@gmail.com>
Date: Thu, 26 Dec 2019 20:50:57 -0500
Subject: a few more tags, just printing

---
 src/kernel/main.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 70 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/kernel/main.c b/src/kernel/main.c
index 6993233..10f0446 100644
--- a/src/kernel/main.c
+++ b/src/kernel/main.c
@@ -26,7 +26,7 @@ OF THIS SOFTWARE.
 enum tag_type {
   BOOT_COMMAND     = 0x00000001,
   LOADER_NAME      = 0x00000002,
-  BOOT_MODULES     = 0x00000003,
+  BOOT_MODULE      = 0x00000003,
   MEMORY_INFO      = 0x00000004,
   BOOT_DEVICE      = 0x00000005,
   MEMORY_MAP       = 0x00000006,
@@ -113,9 +113,24 @@ struct fbuf_rgb_info {
   uint8_t blue_mask;
 } __attribute__ ((__packed__));
 
+struct elf_tag {
+  uint16_t count;
+  uint16_t size;
+  uint16_t shndx;
+  uint16_t padding;
+} __attribute__ ((__packed__));
+
+struct module_tag {
+  uint32_t start;
+  uint32_t end;
+  uint8_t argument[1];
+} __attribute__ ((__packed__));
+
 struct boot_device_tag boot_device;
 bool have_boot_device = false;
 bool have_mmap = false;
+uint32_t text_base;
+bool have_text_base;
 
 enum error_codes {
   NO_BOOT_DEVICE = 0x00000000,
@@ -137,11 +152,29 @@ uint32_t main(void) {
     put_32_hex(tag_pointer->size);
     switch (tag_pointer->type) {
 
+    case BOOT_COMMAND:
+      put_sz(": boot arguments\n    ");
+      put_sz(*(uint8_t *)(tag_pointer + 1) ?
+        (uint8_t *)(tag_pointer + 1) : "No arguments");
+      break;
+
     case LOADER_NAME:
       put_sz(": bootloader name\n    ");
       put_sz((uint8_t *)(tag_pointer + 1));
       break;
 
+    case BOOT_MODULE:
+      put_sz(": boot module\n    Loaded at: 0x");
+      struct module_tag *module = (struct module_tag *)(tag_pointer + 1);
+      put_32_hex(module->start);
+      put_sz(" - ");
+      put_32_hex(module->end - 1);
+      if (*module->argument) {
+        put_sz("\n    Argument: ");
+        put_sz(module->argument);
+      }
+      break;
+
     case MEMORY_INFO:
       put_sz(": memory size\n    Lower memory: 0x");
       put_32_hex((tag_pointer + 1)->type);
@@ -273,7 +306,7 @@ uint32_t main(void) {
       struct fbuf_tag *fbuf_info = (struct fbuf_tag *)(tag_pointer + 1);
       put_sz(": framebuffer information\n    Address: 0x");
       put_32_hex(fbuf_info->address_high);
-      put_char(':');
+      put_char('.');
       put_32_hex(fbuf_info->address_low);
       put_sz("\n    Pitch: ");
       put_32_dec(fbuf_info->pitch);
@@ -309,9 +342,23 @@ uint32_t main(void) {
       break;
     }
 
+    case ELF_SYMBOLS: {
+      struct elf_tag *tag = (struct elf_tag *)(tag_pointer + 1);
+      struct elf_shdr *p = (struct elf_shdr *)(tag + 1);
+      put_sz(": ELF shdr table\n    shndx: 0x");
+      put_16_hex(tag->shndx);
+      if (tag->count)
+        for (uint32_t i = 0; i < tag->count; ++i) {
+          ;//TODO
+          p = (struct elf_shdr *)((uint32_t)p + tag->size);
+        }
+      break;
+    }
+
     case IMAGE_BASE_ADDR:
       put_sz(": image address\n    0x");
-      put_32_hex(*(uint32_t *)(tag_pointer + 1));
+      put_32_hex(text_base = *(uint32_t *)(tag_pointer + 1));
+      have_text_base = true;
       break;
 
     default:
@@ -326,12 +373,26 @@ uint32_t main(void) {
   if (!have_mmap)
     return NO_MMAP;
 
-  put_sz("\n\nReady!\n  Memory map size: 0x");
-  put_32_hex(sizeof(struct mmap_entry) * MMAP_SIZE);
-  put_sz("\n  Process table size: 0x");
-  put_32_hex(sizeof(struct proc_info) * 65536);
-  put_sz("\n  File table size: 0x");
-  put_32_hex(sizeof(struct file_info) * 65536);
+  put_sz("\n\nImportant locations:");
+  if (have_text_base) {
+    put_sz("\n  Text section:  0x");
+    put_32_hex(text_base);
+  }
+  put_sz("\n  Memory map:    0x");
+  put_32_hex((uint32_t)mmap_bss);
+  put_sz(" - 0x");
+  put_32_hex((uint32_t)mmap_bss - 1 +
+    sizeof(struct mmap_entry) * MMAP_SIZE);
+  put_sz("\n  Process table: 0x");
+  put_32_hex((uint32_t)proc_table);
+  put_sz(" - 0x");
+  put_32_hex((uint32_t)proc_table - 1 +
+    sizeof(struct proc_info) * 65536);
+  put_sz("\n  File table:    0x");
+  put_32_hex((uint32_t)file_table);
+  put_sz(" - 0x");
+  put_32_hex((uint32_t)file_table - 1 +
+    sizeof(struct file_info) * 65536);
   put_sz("\n\n");
 
   put_sz("No file support yet. Halting.");
-- 
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