From 58b5c8ba417fe99c01d9a48731b887ce434e797e Mon Sep 17 00:00:00 2001
From: Benji Dial <Benji3.141@gmail.com>
Date: Fri, 27 Dec 2019 17:19:51 -0500
Subject: lots of new stuff. new memory manager, some stuff on file plumbing

---
 src/kernel/files.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

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

diff --git a/src/kernel/files.c b/src/kernel/files.c
index 78fe664..b8a9061 100644
--- a/src/kernel/files.c
+++ b/src/kernel/files.c
@@ -18,6 +18,23 @@ OF THIS SOFTWARE.
 */
 
 #include "files.h"
+#include "diskio.h"
+#include "gpt.h"
+
+uint8_t working_drive;
+uint8_t working_part;
+uint8_t buffer[1024];
+
+void set_working_drive(uint8_t name, uint8_t part) {
+  if ((name >= (uint8_t)'a') && (name <= (uint8_t)'z') &&
+    (drives[name - (uint8_t)'a'].flags & PRESENT))
+    working_drive = name - (uint8_t)'a';
+  if (part_info[working_drive].format & ~DIRECT)
+    working_part =
+      (part >= (uint8_t)'0') && (name <= (uint8_t)'9') &&
+      (part_info[working_drive].n_partitions > part) ?
+      (part & 0x0f) : 0;
+}
 
 uint16_t open_file(uint8_t *name) {
   return 0;//TODO
@@ -52,4 +69,22 @@ uint32_t read_line_file(uint16_t handle, uint32_t max, void *buffer) {
     }
     ++i;
   }
+}
+
+void detect_disk_parts(uint8_t drive) {
+  if ((drive >= (uint8_t)'a') && (drive <= (uint8_t)'z')) {
+    uint8_t dn = (drive & 0x1f) - 1;
+    update_status(dn);
+    if (drives[dn].flags & (PRESENT | DISK_IN)) {
+      read_sectors(dn, 0, 2, buffer);
+      if ((*(uint32_t *)&buffer[0x200] == 0x20494645) &&//EFI
+          (*(uint32_t *)&buffer[0x204] == 0x54524150))  //PART
+        part_info[dn].format = gpt_parse_pt(dn, buffer) ? GPT : UNKNOWN;
+      ;
+    }
+    else {
+      part_info[dn].format = NOT_PRESENT;
+      part_info[dn].n_partitions = 0;
+    }
+  }
 }
\ No newline at end of file
-- 
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