1.44 Beta

[BUG FIX UPDATE]
Updates until 1.50 will be bug fix updates as 1.50 will be a full release.
Bug fixes for 1.44:
-Stopped the crashing when moving stuff onto the desktop
-Fixed codeblock formatting in the markdown viewer.

README.md

@@ -1,4 +1,4 @@
-# Brew OS 1.43 Beta
+# Brew OS 1.44 Beta
 BrewOS is now in a Beta stage as i have brought over all apps from brewkernel and have made the DE a lot more usable and stable.
 
 ## Brewkernel is now BrewOS!

iso_root/README.md

@@ -1,4 +1,4 @@
-# Brew OS 1.43 Beta
+# Brew OS 1.44 Beta
 BrewOS is now in a Beta stage as i have brought over all apps from brewkernel and have made the DE a lot more usable and stable.
 
 ## Brewkernel is now BrewOS!

iso_root/limine.cfg

@@ -1,12 +1,8 @@
-# Timeout in seconds that Limine will wait before automatically booting.
 TIMEOUT=3
 
-# The entry name that will be displayed in the boot menu.
 :BrewOS
-    # We use the Limine boot protocol.
     PROTOCOL=limine
 
-    # Path to the kernel to boot. boot:/// represents the partition on which limine.cfg is located.
     KERNEL_PATH=boot:///brewos.elf
 
     #FRAMEBUFFER_WIDTH=1280

limine.cfg

@@ -1,12 +1,8 @@
-# Timeout in seconds that Limine will wait before automatically booting.
 TIMEOUT=3
 
-# The entry name that will be displayed in the boot menu.
 :BrewOS
-    # We use the Limine boot protocol.
     PROTOCOL=limine
 
-    # Path to the kernel to boot. boot:/// represents the partition on which limine.cfg is located.
     KERNEL_PATH=boot:///brewos.elf
 
     #FRAMEBUFFER_WIDTH=1280

linker.ld

@@ -1,14 +1,10 @@
-/* Tell the linker that we want an x86_64 ELF64 output file */
 OUTPUT_FORMAT(elf64-x86-64)
 OUTPUT_ARCH(i386:x86-64)
 
-/* We want the symbol _start to be our entry point */
 ENTRY(_start)
 
-/* Define the memory layout for the kernel */
 SECTIONS
 {
-    /* We want to be loaded in the upper half of memory */
     . = 0xffffffff80000000;
 
     .text : {

src/kernel/about.c

@@ -32,7 +32,7 @@ static void about_paint(Window *win) {
     
     // Version info
     draw_string(offset_x, offset_y + 105, "BrewOS", COLOR_BLACK);
-    draw_string(offset_x, offset_y + 120, "BrewOS Version 1.43", COLOR_BLACK);
+    draw_string(offset_x, offset_y + 120, "BrewOS Version 1.44", COLOR_BLACK);
     draw_string(offset_x, offset_y + 135, "Kernel Version 2.3.1", COLOR_BLACK);
     
     // Copyright

src/kernel/boot.asm

@@ -11,7 +11,6 @@ _start:
     ; Ensure interrupts are disabled
     cli
     
-    ; Setup stack is handled by Limine, but we can re-align if paranoid
     ; (Limine guarantees 16-byte alignment)
 
     ; Call the C kernel entry point

src/kernel/calculator.c

@@ -60,7 +60,6 @@ static void fixed_to_str(long long n, char *buf) {
     }
     frac_buf[f_idx] = 0;
     
-    // If we have a fraction, add it to buffer (reversed first)
     if (f_idx > 0) {
         for (int i = f_idx - 1; i >= 0; i--) {
             temp[pos++] = frac_buf[i];

src/kernel/cli_apps/about.c

@@ -2,6 +2,6 @@
 
 void cli_cmd_brewver(char *args) {
     (void)args;
-    cli_write("BrewOS v1.43 Beta\n");
+    cli_write("BrewOS v1.44 Beta\n");
     cli_write("BrewOS Kernel V2.3.1 Beta\n");
 }

src/kernel/cli_apps/net.c

@@ -140,7 +140,6 @@ void cli_cmd_udptest(char *args){
 
 void cli_cmd_msgrc(char *args) {
     (void)args;
-    // Reset message count since we are viewing them
     cmd_reset_msg_count();
 
     FAT32_FileHandle *fh = fat32_open("messages", "r");

src/kernel/cmd.c

@@ -957,7 +957,7 @@ static void create_test_files(void) {
     fh = fat32_open("README.md", "w");
     if (fh) {
         const char *content = 
-            "# Brew OS 1.40 Beta\n\n"
+            "# Brew OS 1.44 Beta\n\n"
             "BrewOS is now in a Beta stage as i have brought over all apps from brewkernel and have made the DE a lot more usable and stable.\n"
             "## Brewkernel is now BrewOS!\n"
             "Brewkernel will from now on be deprecated as it's core became too messy. I have built a less bloated kernel and wrote a DE above it, which is why it is now an OS instead of a kernel (in my opinion).\n\n"

src/kernel/explorer.c

@@ -75,7 +75,7 @@ static void explorer_handle_right_click(Window *win, int x, int y);
 static void explorer_handle_file_context_menu_click(Window *win, int x, int y);
 static void explorer_perform_paste(Window *win, const char *dest_dir);
 static void explorer_perform_move_internal(Window *win, const char *source_path, const char *dest_dir);
-static void explorer_copy_recursive(const char *src_path, const char *dest_path);
+static bool explorer_copy_recursive(const char *src_path, const char *dest_path);
 Window* explorer_create_window(const char *path);
 
 extern bool is_dragging_file;
@@ -433,11 +433,11 @@ bool explorer_clipboard_has_content(void) {
     return clipboard_action != 0 && clipboard_path[0] != 0;
 }
 
-static void explorer_copy_recursive(const char *src_path, const char *dest_path) {
+static bool explorer_copy_recursive(const char *src_path, const char *dest_path) {
     if (fat32_is_directory(src_path)) {
-        fat32_mkdir(dest_path);
+        if (!fat32_mkdir(dest_path)) return false;
         FAT32_FileInfo *files = (FAT32_FileInfo*)kmalloc(64 * sizeof(FAT32_FileInfo));
-        if (!files) return;
+        if (!files) return false;
         
         int count = fat32_list_directory(src_path, files, 64);
         for (int i = 0; i < count; i++) {
@@ -452,23 +452,29 @@ static void explorer_copy_recursive(const char *src_path, const char *dest_path)
             if (d_sub[explorer_strlen(d_sub)-1] != '/') explorer_strcat(d_sub, "/");
             explorer_strcat(d_sub, files[i].name);
             
-            explorer_copy_recursive(s_sub, d_sub);
+            if (!explorer_copy_recursive(s_sub, d_sub)) { kfree(files); return false; }
         }
         kfree(files);
+        return true;
     } else {
         // Copy file
         FAT32_FileHandle *src = fat32_open(src_path, "r");
         FAT32_FileHandle *dst = fat32_open(dest_path, "w");
+        bool success = false;
         if (src && dst) {
             uint8_t *buf = (uint8_t*)kmalloc(4096);
             if (buf) {
                 int bytes;
-                while ((bytes = fat32_read(src, buf, 4096)) > 0) fat32_write(dst, buf, bytes);
+                success = true;
+                while ((bytes = fat32_read(src, buf, 4096)) > 0) {
+                    if (fat32_write(dst, buf, bytes) != bytes) { success = false; break; }
+                }
                 kfree(buf);
             }
         }
         if (src) fat32_close(src);
         if (dst) fat32_close(dst);
+        return success;
     }
 }
 
@@ -513,8 +519,16 @@ void explorer_clipboard_paste(Window *win, const char *dest_dir) {
     ExplorerState *state = (ExplorerState*)win->data;
     if (!explorer_clipboard_has_content()) return;
     
+    // Prevent pasting a directory into itself or its subdirectories
+    if (explorer_str_starts_with(dest_dir, clipboard_path)) {
+        int src_len = explorer_strlen(clipboard_path);
+        if (dest_dir[src_len] == '\0' || dest_dir[src_len] == '/') {
+            return;
+        }
+    }
+
     // Check for collision
-    char filename[256];
+    char filename[FAT32_MAX_FILENAME];
     int len = explorer_strlen(clipboard_path);
     int i = len - 1;
     while (i >= 0 && clipboard_path[i] != '/') i--;
@@ -522,7 +536,7 @@ void explorer_clipboard_paste(Window *win, const char *dest_dir) {
     for (int k = i + 1; k < len; k++) filename[j++] = clipboard_path[k];
     filename[j] = 0;
     
-    char dest_path[256];
+    char dest_path[FAT32_MAX_PATH];
     explorer_strcpy(dest_path, dest_dir);
     if (dest_path[explorer_strlen(dest_path) - 1] != '/') {
         explorer_strcat(dest_path, "/");
@@ -1760,7 +1774,7 @@ void explorer_refresh_all(void) {
 static void explorer_perform_move_internal(Window *win, const char *source_path, const char *dest_dir) {
     (void)win;
     // 1. Extract filename
-    char filename[256];
+    char filename[FAT32_MAX_FILENAME];
     int len = explorer_strlen(source_path);
     int i = len - 1;
     while (i >= 0 && source_path[i] != '/') i--;
@@ -1769,7 +1783,7 @@ static void explorer_perform_move_internal(Window *win, const char *source_path,
     filename[j] = 0;
     
     // 2. Build dest path
-    char dest_path[256];
+    char dest_path[FAT32_MAX_PATH];
     explorer_strcpy(dest_path, dest_dir);
     if (dest_path[explorer_strlen(dest_path) - 1] != '/') {
         explorer_strcat(dest_path, "/");
@@ -1782,7 +1796,7 @@ static void explorer_perform_move_internal(Window *win, const char *source_path,
     }
     
     if (explorer_str_starts_with(dest_path, "/RecycleBin") && !explorer_str_starts_with(source_path, "/RecycleBin")) {
-        char origin_path[256];
+        char origin_path[FAT32_MAX_PATH];
         explorer_strcpy(origin_path, dest_path);
         explorer_strcat(origin_path, ".origin");
         FAT32_FileHandle *fh = fat32_open(origin_path, "w");
@@ -1793,16 +1807,16 @@ static void explorer_perform_move_internal(Window *win, const char *source_path,
     }
 
     if (!explorer_str_starts_with(dest_path, "/RecycleBin") && explorer_str_starts_with(source_path, "/RecycleBin")) {
-        char origin_path[256];
+        char origin_path[FAT32_MAX_PATH];
         explorer_strcpy(origin_path, source_path);
         explorer_strcat(origin_path, ".origin");
         fat32_delete(origin_path);
     }
 
-    explorer_copy_recursive(source_path, dest_path);
+    if (explorer_copy_recursive(source_path, dest_path)) {
-        
+        // 4. Delete source (Move operation)
-    // 4. Delete source (Move operation)
+        explorer_delete_permanently(source_path);
-    explorer_delete_permanently(source_path);
+    }
         
     // Refresh
     explorer_refresh_all();
@@ -1810,8 +1824,17 @@ static void explorer_perform_move_internal(Window *win, const char *source_path,
 
 void explorer_import_file_to(Window *win, const char *source_path, const char *dest_dir) {
     ExplorerState *state = (ExplorerState*)win->data;
+
+    // Prevent moving a directory into itself or its subdirectories
+    if (explorer_str_starts_with(dest_dir, source_path)) {
+        int src_len = explorer_strlen(source_path);
+        if (dest_dir[src_len] == '\0' || dest_dir[src_len] == '/') {
+            return;
+        }
+    }
+
     // Check for collision
-    char filename[256];
+    char filename[FAT32_MAX_FILENAME];
     int len = explorer_strlen(source_path);
     int i = len - 1;
     while (i >= 0 && source_path[i] != '/') i--;
@@ -1819,7 +1842,7 @@ void explorer_import_file_to(Window *win, const char *source_path, const char *d
     for (int k = i + 1; k < len; k++) filename[j++] = source_path[k];
     filename[j] = 0;
     
-    char dest_path[256];
+    char dest_path[FAT32_MAX_PATH];
     explorer_strcpy(dest_path, dest_dir);
     if (dest_path[explorer_strlen(dest_path) - 1] != '/') explorer_strcat(dest_path, "/");
     explorer_strcat(dest_path, filename);

src/kernel/fat32.c

@@ -1,4 +1,6 @@
 #include "fat32.h"
+#include "memory_manager.h"
+#include "io.h"
 #include <stdbool.h>
 #include <stddef.h>
 
@@ -116,6 +118,9 @@ static void extract_parent_path(const char *path, char *parent) {
 
 // Normalize path (remove .., ., etc)
 void fat32_normalize_path(const char *path, char *normalized) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
+
     char temp[FAT32_MAX_PATH];
     int temp_len = 0;
 
@@ -173,6 +178,7 @@ void fat32_normalize_path(const char *path, char *normalized) {
     }
     
     fs_strcpy(normalized, temp);
+    asm volatile("push %0; popfq" : : "r"(rflags));
 }
 
 // Find file entry by path
@@ -237,8 +243,10 @@ static bool check_desktop_limit(const char *normalized_path) {
         }
         
         // Count files in /Desktop
-        FAT32_FileInfo info[256]; // Temp buffer
+        FAT32_FileInfo *info = (FAT32_FileInfo*)kmalloc(256 * sizeof(FAT32_FileInfo));
+        if (!info) return true;
         int count = fat32_list_directory("/Desktop", info, 256);
+        kfree(info);
         if (count >= desktop_file_limit) return false;
     }
     return true;
@@ -276,6 +284,9 @@ void fat32_set_desktop_limit(int limit) {
 }
 
 FAT32_FileHandle* fat32_open(const char *path, const char *mode) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
+
     char normalized[FAT32_MAX_PATH];
     fat32_normalize_path(path, normalized);
     
@@ -284,24 +295,32 @@ FAT32_FileHandle* fat32_open(const char *path, const char *mode) {
     if (mode[0] == 'r') {
         // Read mode
         if (!entry || (entry->attributes & ATTR_DIRECTORY)) {
+            asm volatile("push %0; popfq" : : "r"(rflags));
             return NULL;  // File not found or is directory
         }
     } else if (mode[0] == 'w' || (mode[0] == 'a')) {
         // Write/append mode - create if not exists
         if (!entry) {
             if (!check_desktop_limit(normalized)) {
+                asm volatile("push %0; popfq" : : "r"(rflags));
                 return NULL;
             }
             
             entry = find_free_entry();
-            if (!entry) return NULL;
+            if (!entry) {
+                asm volatile("push %0; popfq" : : "r"(rflags));
+                return NULL;
+            }
             
             entry->used = true;
             fs_strcpy(entry->full_path, normalized);
             extract_filename(normalized, entry->filename);
             extract_parent_path(normalized, entry->parent_path);
             entry->start_cluster = allocate_cluster();
-            if (!entry->start_cluster) return NULL;
+            if (!entry->start_cluster) {
+                asm volatile("push %0; popfq" : : "r"(rflags));
+                return NULL;
+            }
             entry->size = 0;
             entry->attributes = 0;  // Regular file
         }
@@ -313,7 +332,10 @@ FAT32_FileHandle* fat32_open(const char *path, const char *mode) {
     
     // Find free handle
     FAT32_FileHandle *handle = find_free_handle();
-    if (!handle) return NULL;
+    if (!handle) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
+        return NULL;
+    }
     
     handle->valid = true;
     handle->cluster = entry->start_cluster;
@@ -341,17 +363,24 @@ FAT32_FileHandle* fat32_open(const char *path, const char *mode) {
         handle->cluster = current_cluster;
     }
     
+    asm volatile("push %0; popfq" : : "r"(rflags));
     return handle;
 }
 
 void fat32_close(FAT32_FileHandle *handle) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     if (handle) {
         handle->valid = false;
     }
+    asm volatile("push %0; popfq" : : "r"(rflags));
 }
 
 int fat32_read(FAT32_FileHandle *handle, void *buffer, int size) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     if (!handle || !handle->valid || handle->mode != 0) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return -1;
     }
     
@@ -388,11 +417,15 @@ int fat32_read(FAT32_FileHandle *handle, void *buffer, int size) {
         }
     }
     
+    asm volatile("push %0; popfq" : : "r"(rflags));
     return bytes_read;
 }
 
 int fat32_write(FAT32_FileHandle *handle, const void *buffer, int size) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     if (!handle || !handle->valid || (handle->mode != 1 && handle->mode != 2)) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return -1;
     }
     
@@ -404,7 +437,10 @@ int fat32_write(FAT32_FileHandle *handle, const void *buffer, int size) {
          uint32_t next = fat_table[handle->cluster];
          if (next >= 0xFFFFFFF8) {
              next = allocate_cluster();
-             if (!next) return 0;
+             if (!next) {
+                 asm volatile("push %0; popfq" : : "r"(rflags));
+                 return 0;
+             }
              fat_table[handle->cluster] = next;
          }
          handle->cluster = next;
@@ -451,11 +487,15 @@ int fat32_write(FAT32_FileHandle *handle, const void *buffer, int size) {
         }
     }
     
+    asm volatile("push %0; popfq" : : "r"(rflags));
     return bytes_written;
 }
 
 int fat32_seek(FAT32_FileHandle *handle, int offset, int whence) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     if (!handle || !handle->valid) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return -1;
     }
     
@@ -474,23 +514,31 @@ int fat32_seek(FAT32_FileHandle *handle, int offset, int whence) {
     }
     
     handle->position = new_position;
+    asm volatile("push %0; popfq" : : "r"(rflags));
     return new_position;
 }
 
 bool fat32_mkdir(const char *path) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     char normalized[FAT32_MAX_PATH];
     fat32_normalize_path(path, normalized);
     
     if (find_file(normalized)) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return false;  // Already exists
     }
     
     if (!check_desktop_limit(normalized)) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return false;
     }
     
     FileEntry *entry = find_free_entry();
-    if (!entry) return false;
+    if (!entry) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
+        return false;
+    }
     
     entry->used = true;
     fs_strcpy(entry->full_path, normalized);
@@ -500,43 +548,58 @@ bool fat32_mkdir(const char *path) {
     entry->size = 0;
     entry->attributes = ATTR_DIRECTORY;
     
+    asm volatile("push %0; popfq" : : "r"(rflags));
     return true;
 }
 
 bool fat32_rmdir(const char *path) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     char normalized[FAT32_MAX_PATH];
     fat32_normalize_path(path, normalized);
     
     FileEntry *entry = find_file(normalized);
     if (!entry || !(entry->attributes & ATTR_DIRECTORY)) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return false;
     }
     
     entry->used = false;
+    asm volatile("push %0; popfq" : : "r"(rflags));
     return true;
 }
 
 bool fat32_delete(const char *path) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     char normalized[FAT32_MAX_PATH];
     fat32_normalize_path(path, normalized);
     
     FileEntry *entry = find_file(normalized);
     if (!entry || (entry->attributes & ATTR_DIRECTORY)) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return false;
     }
     
     entry->used = false;
+    asm volatile("push %0; popfq" : : "r"(rflags));
     return true;
 }
 
 bool fat32_exists(const char *path) {
-    return find_file(path) != NULL;
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
+    bool res = find_file(path) != NULL;
+    asm volatile("push %0; popfq" : : "r"(rflags));
+    return res;
 }
 
 bool fat32_rename(const char *old_path, const char *new_path) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     FileEntry *entry = find_file(old_path);
-    if (!entry) return false;
+    if (!entry) { asm volatile("push %0; popfq" : : "r"(rflags)); return false; }
-    if (find_file(new_path)) return false; // Destination exists
+    if (find_file(new_path)) { asm volatile("push %0; popfq" : : "r"(rflags)); return false; } // Destination exists
 
     int old_len = fs_strlen(old_path);
 
@@ -572,20 +635,28 @@ bool fat32_rename(const char *old_path, const char *new_path) {
             fs_strcat(files[i].parent_path, suffix);
         }
     }
+    asm volatile("push %0; popfq" : : "r"(rflags));
     return true;
 }
 
 bool fat32_is_directory(const char *path) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     FileEntry *entry = find_file(path);
-    return entry && (entry->attributes & ATTR_DIRECTORY);
+    bool res = entry && (entry->attributes & ATTR_DIRECTORY);
+    asm volatile("push %0; popfq" : : "r"(rflags));
+    return res;
 }
 
 int fat32_list_directory(const char *path, FAT32_FileInfo *entries, int max_entries) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     char normalized[FAT32_MAX_PATH];
     fat32_normalize_path(path, normalized);
     
     FileEntry *dir = find_file(normalized);
     if (!dir || !(dir->attributes & ATTR_DIRECTORY)) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return 0;  // Not a directory
     }
     
@@ -600,23 +671,30 @@ int fat32_list_directory(const char *path, FAT32_FileInfo *entries, int max_entr
         }
     }
     
+    asm volatile("push %0; popfq" : : "r"(rflags));
     return count;
 }
 
 bool fat32_chdir(const char *path) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     char normalized[FAT32_MAX_PATH];
     fat32_normalize_path(path, normalized);
     
     FileEntry *entry = find_file(normalized);
     if (!entry || !(entry->attributes & ATTR_DIRECTORY)) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return false;
     }
     
     fs_strcpy(current_dir, normalized);
+    asm volatile("push %0; popfq" : : "r"(rflags));
     return true;
 }
 
 void fat32_get_current_dir(char *buffer, int size) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     int len = fs_strlen(current_dir);
     if (len >= size) len = size - 1;
     
@@ -624,4 +702,5 @@ void fat32_get_current_dir(char *buffer, int size) {
         buffer[i] = current_dir[i];
     }
     buffer[len] = 0;
+    asm volatile("push %0; popfq" : : "r"(rflags));
 }

src/kernel/graphics.c

@@ -1,6 +1,7 @@
 #include <stddef.h>
 #include "graphics.h"
 #include "font.h"
+#include "io.h"
 
 static struct limine_framebuffer *g_fb = NULL;
 static uint32_t g_bg_color = 0xFF696969;  // Dark gray background
@@ -69,6 +70,9 @@ static void merge_dirty_rect(int x, int y, int w, int h) {
 }
 
 void graphics_mark_dirty(int x, int y, int w, int h) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
+
     // Clamp to screen bounds
     if (x < 0) {
         w += x;
@@ -85,9 +89,13 @@ void graphics_mark_dirty(int x, int y, int w, int h) {
         h = get_screen_height() - y;
     }
     
-    if (w <= 0 || h <= 0) return;
+    if (w <= 0 || h <= 0) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
+        return;
+    }
     
     merge_dirty_rect(x, y, w, h);
+    asm volatile("push %0; popfq" : : "r"(rflags));
 }
 
 void graphics_mark_screen_dirty(void) {
@@ -103,7 +111,10 @@ DirtyRect graphics_get_dirty_rect(void) {
 }
 
 void graphics_clear_dirty(void) {
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
     g_dirty.active = false;
+    asm volatile("push %0; popfq" : : "r"(rflags));
 }
 
 void put_pixel(int x, int y, uint32_t color) {

src/kernel/interrupts.asm

@@ -11,10 +11,7 @@ send_eoi:
     push rax
     mov al, 0x20
     out 0x20, al ; Master PIC
-    ; If IRQ > 7, send to Slave too (Mouse is IRQ 12)
+
-    ; We'll handle this in the specific wrappers or C code.
-    ; Actually, simpler to do EOI in C or here.
-    ; Let's just do it in C.
     pop rax
     ret
 

src/kernel/markdown.c

@@ -116,10 +116,6 @@ static void md_parse_line(const char *raw_line, char *output, MDLineType *type,
         *type = MD_LINE_BLOCKQUOTE;
         i++;
         if (raw_line[i] == ' ') i++;
-    } else if (raw_line[i] == '`') {
-        // Code block
-        *type = MD_LINE_CODE;
-        i++;
     }
     
     // Parse inline formatting and copy content
@@ -215,26 +211,36 @@ void markdown_open_file(const char *filename) {
     int line = 0;
     int col = 0;
     char raw_line[256] = "";
+    bool in_code_block = false;
     
     for (int i = 0; i < bytes_read && line < MD_MAX_LINES; i++) {
         char ch = buffer[i];
         
         if (ch == '\n') {
             raw_line[col] = 0;
-            
+
-            // Parse the raw line
+            if (raw_line[0] == '`' && raw_line[1] == '`' && raw_line[2] == '`') {
-            char parsed_content[256];
+                in_code_block = !in_code_block;
-            MDLineType type;
+            } else {
-            int indent;
+                if (in_code_block) {
-            md_parse_line(raw_line, parsed_content, &type, &indent);
+                    md_strcpy(lines[line].content, raw_line);
-            
+                    lines[line].length = md_strlen(raw_line);
-            // Store parsed line
+                    lines[line].type = MD_LINE_CODE;
-            md_strcpy(lines[line].content, parsed_content);
+                    lines[line].indent_level = 0;
-            lines[line].length = md_strlen(parsed_content);
+                    line++;
-            lines[line].type = type;
+                } else {
-            lines[line].indent_level = indent;
+                    char parsed_content[256];
-            
+                    MDLineType type;
-            line++;
+                    int indent;
+                    md_parse_line(raw_line, parsed_content, &type, &indent);
+                    md_strcpy(lines[line].content, parsed_content);
+                    lines[line].length = md_strlen(parsed_content);
+                    lines[line].type = type;
+                    lines[line].indent_level = indent;
+                    line++;
+                }
+            }
+
             col = 0;
             raw_line[0] = 0;
         } else if (col < 255) {
@@ -245,16 +251,24 @@ void markdown_open_file(const char *filename) {
     // Handle last line if no trailing newline
     if (col > 0 && line < MD_MAX_LINES) {
         raw_line[col] = 0;
-        char parsed_content[256];
+        if (raw_line[0] == '`' && raw_line[1] == '`' && raw_line[2] == '`') {
-        MDLineType type;
+        } else if (in_code_block) {
-        int indent;
+            md_strcpy(lines[line].content, raw_line);
-        md_parse_line(raw_line, parsed_content, &type, &indent);
+            lines[line].length = md_strlen(raw_line);
-        
+            lines[line].type = MD_LINE_CODE;
-        md_strcpy(lines[line].content, parsed_content);
+            lines[line].indent_level = 0;
-        lines[line].length = md_strlen(parsed_content);
+            line++;
-        lines[line].type = type;
+        } else {
-        lines[line].indent_level = indent;
+            char parsed_content[256];
-        line++;
+            MDLineType type;
+            int indent;
+            md_parse_line(raw_line, parsed_content, &type, &indent);
+            md_strcpy(lines[line].content, parsed_content);
+            lines[line].length = md_strlen(parsed_content);
+            lines[line].type = type;
+            lines[line].indent_level = indent;
+            line++;
+        }
     }
     
     line_count = line;
@@ -331,7 +345,7 @@ static void md_paint(Window *win) {
                 text_color = 0xFF808080;  // Gray
                 break;
             case MD_LINE_CODE:
-                text_color = 0xFF800000;  // Dark red
+                text_color = COLOR_WHITE;
                 break;
             default:
                 text_color = COLOR_BLACK;
@@ -371,7 +385,6 @@ static void md_paint(Window *win) {
             }
             line_segment[segment_len] = 0;
             
-            // Word-based wrapping: if we didn't reach end of string, find last space
             if (char_idx < text_len && segment_len > 0) {
                 // Look for the last space in the segment
                 int last_space = -1;
@@ -382,7 +395,6 @@ static void md_paint(Window *win) {
                     }
                 }
                 
-                // If we found a space, break there
                 if (last_space > 0) {
                     segment_len = last_space;
                     line_segment[segment_len] = 0;
@@ -395,6 +407,10 @@ static void md_paint(Window *win) {
                 }
             }
             
+            if (line->type == MD_LINE_CODE && segment_len > 0) {
+                draw_rect(x_offset - 2, line_y - 2, (segment_len * MD_CHAR_WIDTH) + 4, 12, COLOR_BLACK);
+            }
+
             // Draw special elements for first wrapped line of this markdown line
             if (local_display_line == 0) {
                 switch (line->type) {
@@ -414,10 +430,6 @@ static void md_paint(Window *win) {
                         // Draw left border
                         draw_rect(x_offset - 4, line_y, 2, line_height, 0xFF404080);
                         break;
-                    case MD_LINE_CODE:
-                        // Draw background for code
-                        draw_rect(x_offset - 2, line_y, (max_chars_per_line * MD_CHAR_WIDTH) + 4, line_height, 0xFFF0F0F0);
-                        break;
                     default:
                         break;
                 }
@@ -438,8 +450,7 @@ static void md_paint(Window *win) {
             if (char_idx >= text_len) break;
         }
         
-        // Move display line forward by the actual number of wrapped lines created
+
-        // Each wrapped line uses one MD_LINE_HEIGHT worth of space
         display_line += wrapped_line_count;
         
         i++;
@@ -451,8 +462,7 @@ static void md_paint(Window *win) {
 static void md_handle_key(Window *win, char c) {
     (void)win;  // Suppress unused warning
     
-    // Handle scrolling with arrow keys and W/S
+
-    // 17 = UP arrow, 18 = DOWN arrow (from ps2 keyboard mapping)
     if (c == 'w' || c == 'W' || c == 17) {  // Page up or UP arrow
         scroll_top -= 3;
         if (scroll_top < 0) scroll_top = 0;

src/kernel/memory_manager.c

@@ -148,23 +148,30 @@ void* kmalloc(size_t size) {
         memory_manager_init();
     }
     
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
+
     if (size == 0 || size > memory_pool_size) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return NULL;
     }
     
     // Check if we can allocate
     if (total_allocated + size > memory_pool_size) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return NULL;
     }
     
     // Find free space
     void *ptr = find_free_space(size);
     if (ptr == NULL) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return NULL;
     }
     
     // Add block entry
     if (block_count >= MAX_ALLOCATIONS) {
+        asm volatile("push %0; popfq" : : "r"(rflags));
         return NULL;
     }
     
@@ -185,6 +192,7 @@ void* kmalloc(size_t size) {
     // Clear memory
     mem_memset(ptr, 0, size);
     
+    asm volatile("push %0; popfq" : : "r"(rflags));
     return ptr;
 }
 
@@ -193,6 +201,9 @@ void kfree(void *ptr) {
         return;
     }
     
+    uint64_t rflags;
+    asm volatile("pushfq; pop %0; cli" : "=r"(rflags));
+
     // Find and free the block
     for (int i = 0; i < block_count; i++) {
         if (block_list[i].allocated && block_list[i].address == ptr) {
@@ -204,9 +215,11 @@ void kfree(void *ptr) {
                 block_list[j] = block_list[j + 1];
             }
             block_count--;
+            asm volatile("push %0; popfq" : : "r"(rflags));
             return;
         }
     }
+    asm volatile("push %0; popfq" : : "r"(rflags));
 }
 
 void* krealloc(void *ptr, size_t new_size) {

src/kernel/tcp.c

@@ -195,7 +195,6 @@ void tcp_close(tcp_socket_t *sock) {
 
 int tcp_read(tcp_socket_t *sock, char *buffer, int max_len) {
     if (!sock) return 0;
-    // Simple copy of what we have
     int count = 0;
     for (int i = 0; i < sock->rx_pos && i < max_len; i++) {
         buffer[i] = sock->rx_buffer[i];

src/kernel/wm.c

@@ -976,6 +976,7 @@ void wm_handle_click(int x, int y) {
                 }
                 
                 if (can_paste) {
+                    int old_count = desktop_icon_count;
                     if (desktop_menu_target_icon != -1 && desktop_icons[desktop_menu_target_icon].type == 1) {
                         // Paste into folder
                         char path[128] = "/Desktop/";
@@ -987,6 +988,20 @@ void wm_handle_click(int x, int y) {
                         explorer_clipboard_paste(&win_explorer, "/Desktop");
                     }
                     refresh_desktop_icons();
+
+                    // If auto-align is OFF and we pasted to the background, place at click location
+                    if (!desktop_auto_align && desktop_icon_count > old_count && desktop_menu_target_icon == -1) {
+                        int new_idx = desktop_icon_count - 1;
+                        desktop_icons[new_idx].x = desktop_menu_x - 20;
+                        desktop_icons[new_idx].y = desktop_menu_y - 20;
+                        if (desktop_snap_to_grid) {
+                            int col = (desktop_icons[new_idx].x - 20 + 40) / 80;
+                            int row = (desktop_icons[new_idx].y - 20 + 40) / 80;
+                            if (col < 0) col = 0; if (row < 0) row = 0;
+                            desktop_icons[new_idx].x = 20 + col * 80;
+                            desktop_icons[new_idx].y = 20 + row * 80;
+                        }
+                    }
                 }
             }
             else if (item == 3 && desktop_menu_target_icon != -1) { // Delete
@@ -1496,20 +1511,17 @@ void wm_handle_right_click(int x, int y) {
                             wm_show_message("Error", "Desktop is full!");
                         } else {
                             explorer_import_file_to(&win_explorer, drag_file_path, "/Desktop");
-                            refresh_desktop_icons();
                         }
                         
                         // Handle insertion at specific position
+                        char filename[64];
+                        int len = 0; while(drag_file_path[len]) len++;
+                        int s = len - 1; while(s >= 0 && drag_file_path[s] != '/') s--;
+                        s++;
+                        int d = 0; while(drag_file_path[s] && d < 63) filename[d++] = drag_file_path[s++];
+                        filename[d] = 0;
+
                         if (desktop_auto_align && !msg_box_visible) {
-                            // Find the newly added icon (it will be at the end)
-                            // Extract filename from drag_file_path
-                            char filename[64];
-                            int len = 0; while(drag_file_path[len]) len++;
-                            int s = len - 1; while(s >= 0 && drag_file_path[s] != '/') s--;
-                            s++;
-                            int d = 0; while(drag_file_path[s] && d < 63) filename[d++] = drag_file_path[s++];
-                            filename[d] = 0;
-                            
                             int new_idx = -1;
                             for(int i=0; i<desktop_icon_count; i++) {
                                 if (str_eq(desktop_icons[i].name, filename) == 0) {
@@ -1534,6 +1546,21 @@ void wm_handle_right_click(int x, int y) {
                                 
                                 refresh_desktop_icons(); // Re-apply layout
                             }
+                        } else if (!desktop_auto_align && !msg_box_visible) {
+                            for(int i=0; i<desktop_icon_count; i++) {
+                                if (str_eq(desktop_icons[i].name, filename) == 0) {
+                                    desktop_icons[i].x = mx - 20;
+                                    desktop_icons[i].y = my - 20;
+                                    if (desktop_snap_to_grid) {
+                                        int col = (desktop_icons[i].x - 20 + 40) / 80;
+                                        int row = (desktop_icons[i].y - 20 + 40) / 80;
+                                        if (col < 0) col = 0; if (row < 0) row = 0;
+                                        desktop_icons[i].x = 20 + col * 80;
+                                        desktop_icons[i].y = 20 + row * 80;
+                                    }
+                                    break;
+                                }
+                            }
                         }
                     } else if (!dropped_on_target) {
                         // Moved within desktop