From e8c6577617bffa4402c07c7aa20e3c24f03c1c20 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Sun, 6 Sep 2020 00:48:07 -0400
Subject: program loading, others

big kernel additions: paging, elf loading, separate kernel and user page allocation
it now properly loads and runs sd0:bin/init.elf
still need to determine which disk was booted from, and start the init on that disk
---
 src/kernel/main.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 50 insertions(+), 8 deletions(-)

(limited to 'src/kernel/main.c')

diff --git a/src/kernel/main.c b/src/kernel/main.c
index 0c57ef3..eb57a01 100644
--- a/src/kernel/main.c
+++ b/src/kernel/main.c
@@ -1,21 +1,30 @@
 #include <stdint.h>
 #include "serial.h"
 #include "panic.h"
+#include "paging.h"
 #include "boot.h"
 #include "util.h"
 #include "fat.h"
 #include "ide.h"
-#include "mem.h"
+#include "idt.h"
+#include "pmap.h"
+#include "task.h"
 #include "pci.h"
 #include "log.h"
+#include "elf.h"
 
+void reset_tree();
 void tree(struct drive *d);
 
+void _start_user_mode() __attribute__ ((noreturn));
+
 __attribute__ ((noreturn))
 void main() {
   char nbuf[11];
 
-  init_mmap();
+  init_pagemap();
+  init_paging();
+  init_tasks();
   init_serial();
   init_log();
 
@@ -57,6 +66,8 @@ void main() {
   init_fat();
   //other fs drivers
 
+  init_drives();
+
   init_ide();
   //other drive drivers
 
@@ -97,13 +108,44 @@ void main() {
 
   logch('\n');
 
-  u32_dec(pages_left * 4, nbuf);
+  for (uint8_t n = 0;  n < n_drives; ++n) {
+    if (drives[n].get_free_sectors(drives + n) == -1)
+      continue;
+
+    u32_dec(n, nbuf);
+    logsz("sd");
+    logsz(nbuf);
+    logsz(" tree:\n");
+
+    reset_tree();
+    tree(drives + n);
+    logch('\n');
+  }
+
+  if (!try_elf_run(drives, "BIN/INIT.ELF"))
+    panic("Failed to load init program.");
+
+  if (BOOT_INFO->support_flags & BIS_PAE)
+    logsz("Processor supports PAE (but Portland OS does not yet).\n\n");
+  else
+    logsz("Processor does not support PAE.\n\n");
+
+  u32_dec(kernel_pages_left * 4, nbuf);
+  logsz(nbuf);
+  logsz("k / ");
+  u32_dec(max_kernel_pages * 4, nbuf);
+  logsz(nbuf);
+  logsz("k kernel heap free.\n");
+  u32_dec(user_pages_left * 4, nbuf);
+  logsz(nbuf);
+  logsz("k / ");
+  u32_dec(max_user_pages * 4, nbuf);
   logsz(nbuf);
-  logsz("k dynamic memory free.\n\n");
+  logsz("k user memory free.\n");
 
-  logsz("sd0 root:\n");
-  tree(&drives[0]);
+//while (1)
+//  asm ("hlt");
 
-  while (1)
-    asm ("hlt");
+  init_idt();
+  _start_user_mode();
 }
\ No newline at end of file
-- 
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