From 63167f223e1f54910f6b80e698390ee60aec79ee Mon Sep 17 00:00:00 2001
From: Benji Dial <Benji3.141@gmail.com>
Date: Tue, 11 Aug 2020 11:33:21 -0400
Subject: lots of progress

currently, BAR fields of IDE drives are all returning zero, and the ATA read function isn't working. i'm not sure why.
i'm going to work on VESA next, and come back to the IDE driver later
---
 src/kernel/fs.c | 144 --------------------------------------------------------
 1 file changed, 144 deletions(-)
 delete mode 100644 src/kernel/fs.c

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

diff --git a/src/kernel/fs.c b/src/kernel/fs.c
deleted file mode 100644
index 0d51c22..0000000
--- a/src/kernel/fs.c
+++ /dev/null
@@ -1,144 +0,0 @@
-#include <stdint.h>
-#include "fs.h"
-#include "ata.h"
-#include "fat.h"
-#include <stdbool.h>
-#include "panic.h"
-#include "util.h"
-
-#define MAX_HANDLES 32
-#define FILE_BUFFER(h) ((void *)(0x0002be00 + (h << 9)))
-#define HANDLE(h) ((handles - 1)[h])
-#define HEAD(h) (FILE_BUFFER(h) + HANDLE(h).seek % 512)
-
-enum {
-  FH_DIRTY     = 0x01,
-  FH_NO_WRITE  = 0x02,
-  FH_NO_EXPAND = 0x04,
-  FH_ROOT      = 0x08
-};
-
-struct handle_info {
-  uint16_t first_cluster;
-  uint16_t loaded_cluster;
-  uint32_t seek;
-  uint32_t length;
-  uint8_t flags;
-};
-
-struct handle_info handles[MAX_HANDLES];
-
-void clear_fs_handles() {
-  struct handle_info *f = handles;
-  while (f < handles + MAX_HANDLES)
-    (f++)->first_cluster = 0;
-}
-
-fs_handle next_handle() {
-  fs_handle r = 0;
-  while (HANDLE(++r).first_cluster)
-    if (r == MAX_HANDLES)
-      return 0;
-  return r;
-}
-
-void write_buffer(fs_handle handle) {
-  HANDLE(handle).flags &= ~FH_DIRTY;
-  if (HANDLE(handle).flags & FH_ROOT)
-    write_sectors(HANDLE(handle).loaded_cluster, 1, FILE_BUFFER(handle));
-  else
-    write_sectors(CTOS(HANDLE(handle).loaded_cluster), 1, FILE_BUFFER(handle));
-}
-
-void read_buffer(fs_handle handle) {
-  if (HANDLE(handle).flags & FH_DIRTY)
-    write_buffer(handle);
-  uint16_t s = HANDLE(handle).seek >> 9;
-  if (HANDLE(handle).flags & FH_ROOT) {
-    HANDLE(handle).loaded_cluster = HANDLE(handle).first_cluster + s;
-    read_sectors(HANDLE(handle).first_cluster + s, 1, FILE_BUFFER(handle));
-  }
-  else {
-    uint16_t c = HANDLE(handle).first_cluster;
-    while (s--)
-      c = FAT[c];
-    HANDLE(handle).loaded_cluster = c;
-    read_sectors(CTOS(c), 1, FILE_BUFFER(handle));
-  }
-}
-
-fs_handle fs_open(uint8_t *path) {
-  fs_handle next = next_handle();
-  if (!next)
-    return 0;
-  struct directory_entry e;
-  if (get_entry(path, &e))
-    return 0;
-  HANDLE(next).first_cluster = e.first_cluster;
-  HANDLE(next).seek = 0;
-  HANDLE(next).length = e.length;
-  HANDLE(next).flags = (e.attrib & FA_READ_ONLY ? FH_NO_WRITE  : 0) |
-                       (e.attrib & FA_SYSTEM    ? FH_NO_EXPAND : 0);
-  read_buffer(next);
-  return next;
-}
-
-fs_handle fs_open_root() {
-  fs_handle next = next_handle();
-  if (!next)
-    return 0;
-  HANDLE(next).first_cluster = FAT_INFO->reserved_sectors + FAT_INFO->sectors_per_fat;
-  HANDLE(next).seek = 0;
-  HANDLE(next).length = FAT_INFO->root_entries * 32;
-  HANDLE(next).flags = FH_NO_EXPAND | FH_ROOT;
-  read_buffer(next);
-  return next;
-}
-
-int32_t fs_seek(fs_handle handle, int32_t by) {
-  uint32_t old = HANDLE(handle).seek;
-  uint32_t to = -by > old ? 0 : old + by > HANDLE(handle).length ? HANDLE(handle).length : old + by;
-  HANDLE(handle).seek = to;
-  if ((to ^ old) & 0xfe00)
-    read_buffer(handle);
-  return to - old;
-}
-
-uint32_t fs_read(fs_handle handle, uint32_t max, void *buffer) {
-  max = HANDLE(handle).seek + max > HANDLE(handle).length ? HANDLE(handle).length - HANDLE(handle).seek : max;
-  uint32_t left = max, eos = 512 - (HANDLE(handle).seek & 0x1ff);
-  if (left < eos) {
-    memcpy(buffer, FILE_BUFFER(handle) + (HANDLE(handle).seek & 0x1ff), left);
-    HANDLE(handle).seek += left;
-    return max;
-  }
-  memcpy(buffer, FILE_BUFFER(handle) + (HANDLE(handle).seek & 0x1ff), eos);
-  left -= eos;
-  buffer += eos;
-  HANDLE(handle).seek += eos;
-  while (left >= 512) {
-    read_buffer(handle);
-    memcpy(buffer, FILE_BUFFER(handle), 512);
-    left -= 512;
-    buffer += 512;
-    HANDLE(handle).seek += 512;
-  }
-  if (left) {
-    read_buffer(handle);
-    memcpy(buffer, FILE_BUFFER(handle), left);
-    HANDLE(handle).seek += left;
-  }
-  return max;
-}
-
-uint32_t fs_write(fs_handle handle, uint32_t max, void *buffer) {
-  if (HANDLE(handle).flags & FH_NO_WRITE)
-    return 0;
-  panic("Not implemented (fs_write).");
-}
-
-void fs_close(fs_handle handle) {
-  if (HANDLE(handle).flags & FH_DIRTY)
-    write_buffer(handle);
-  HANDLE(handle).first_cluster = 0;
-}
\ No newline at end of file
-- 
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