Stage 6

Makefile

@@ -75,6 +75,8 @@ C_SOURCES := \
     clks/kernel/elf64.c \
     clks/kernel/elfrunner.c \
     clks/kernel/syscall.c \
+    clks/kernel/ramdisk.c \
+    clks/kernel/fs.c \
     clks/lib/string.c \
     clks/drivers/serial/serial.c \
     clks/drivers/video/framebuffer.c \
@@ -243,3 +245,4 @@ help:
 > @echo "  make run"
 > @echo "  make debug"
 > @echo "  make NO_COLOR=1 <target>"
+

clks/include/clks/boot.h

@@ -8,5 +8,7 @@ clks_bool clks_boot_base_revision_supported(void);
 const struct limine_framebuffer *clks_boot_get_framebuffer(void);
 const struct limine_memmap_response *clks_boot_get_memmap(void);
 const struct limine_file *clks_boot_get_executable_file(void);
+u64 clks_boot_get_module_count(void);
+const struct limine_file *clks_boot_get_module(u64 index);
 
 #endif

clks/include/clks/fs.h

@@ -0,0 +1,24 @@
+#ifndef CLKS_FS_H
+#define CLKS_FS_H
+
+#include <clks/types.h>
+
+enum clks_fs_node_type {
+    CLKS_FS_NODE_FILE = 1,
+    CLKS_FS_NODE_DIR = 2,
+};
+
+struct clks_fs_node_info {
+    enum clks_fs_node_type type;
+    u64 size;
+};
+
+void clks_fs_init(void);
+clks_bool clks_fs_is_ready(void);
+clks_bool clks_fs_stat(const char *path, struct clks_fs_node_info *out_info);
+const void *clks_fs_read_all(const char *path, u64 *out_size);
+u64 clks_fs_count_children(const char *dir_path);
+clks_bool clks_fs_get_child_name(const char *dir_path, u64 index, char *out_name, usize out_name_size);
+u64 clks_fs_node_count(void);
+
+#endif

clks/include/clks/limine.h

@@ -39,6 +39,14 @@
         0x31eb5d1c5ff23b69ULL \
     }
 
+#define LIMINE_MODULE_REQUEST \
+    { \
+        LIMINE_COMMON_MAGIC, \
+        LIMINE_REQUEST_MAGIC, \
+        0x3e7e279702be32afULL, \
+        0xca1c4f3bd1280ceeULL \
+    }
+
 #define LIMINE_MEMMAP_USABLE                 0ULL
 #define LIMINE_MEMMAP_RESERVED               1ULL
 #define LIMINE_MEMMAP_ACPI_RECLAIMABLE       2ULL
@@ -132,4 +140,16 @@ struct limine_executable_file_request {
     struct limine_executable_file_response *response;
 };
 
+struct limine_module_response {
+    u64 revision;
+    u64 module_count;
+    struct limine_file **modules;
+};
+
+struct limine_module_request {
+    u64 id[4];
+    u64 revision;
+    struct limine_module_response *response;
+};
+
 #endif

clks/include/clks/ramdisk.h

@@ -0,0 +1,24 @@
+#ifndef CLKS_RAMDISK_H
+#define CLKS_RAMDISK_H
+
+#include <clks/types.h>
+
+#define CLKS_RAMDISK_PATH_MAX 192U
+
+enum clks_ramdisk_entry_type {
+    CLKS_RAMDISK_ENTRY_FILE = 1,
+    CLKS_RAMDISK_ENTRY_DIR = 2,
+};
+
+struct clks_ramdisk_entry {
+    enum clks_ramdisk_entry_type type;
+    char path[CLKS_RAMDISK_PATH_MAX];
+    const void *data;
+    u64 size;
+};
+
+typedef clks_bool (*clks_ramdisk_iter_fn)(const struct clks_ramdisk_entry *entry, void *ctx);
+
+clks_bool clks_ramdisk_iterate(const void *image, u64 image_size, clks_ramdisk_iter_fn iter_fn, void *ctx);
+
+#endif

clks/kernel/fs.c

@@ -0,0 +1,572 @@
+#include <clks/boot.h>
+#include <clks/fs.h>
+#include <clks/log.h>
+#include <clks/ramdisk.h>
+#include <clks/string.h>
+#include <clks/types.h>
+
+#define CLKS_FS_MAX_NODES 512U
+#define CLKS_FS_PATH_MAX  CLKS_RAMDISK_PATH_MAX
+
+struct clks_fs_node {
+    clks_bool used;
+    enum clks_fs_node_type type;
+    u16 parent;
+    u16 reserved;
+    const void *data;
+    u64 size;
+    char path[CLKS_FS_PATH_MAX];
+};
+
+struct clks_fs_build_stats {
+    u64 file_count;
+    u64 dir_count;
+};
+
+static struct clks_fs_node clks_fs_nodes[CLKS_FS_MAX_NODES];
+static u16 clks_fs_nodes_used = 0U;
+static clks_bool clks_fs_ready = CLKS_FALSE;
+
+static clks_bool clks_fs_normalize_external_path(const char *path, char *out_internal, usize out_size) {
+    usize in_pos = 0;
+    usize out_pos = 0;
+
+    if (path == CLKS_NULL || out_internal == CLKS_NULL || out_size == 0U) {
+        return CLKS_FALSE;
+    }
+
+    if (path[0] != '/') {
+        return CLKS_FALSE;
+    }
+
+    while (path[in_pos] == '/') {
+        in_pos++;
+    }
+
+    while (path[in_pos] != '\0') {
+        usize comp_start = in_pos;
+        usize comp_len;
+
+        while (path[in_pos] != '\0' && path[in_pos] != '/') {
+            in_pos++;
+        }
+
+        comp_len = in_pos - comp_start;
+
+        if (comp_len == 0U) {
+            while (path[in_pos] == '/') {
+                in_pos++;
+            }
+            continue;
+        }
+
+        if (comp_len == 1U && path[comp_start] == '.') {
+            while (path[in_pos] == '/') {
+                in_pos++;
+            }
+            continue;
+        }
+
+        if (comp_len == 2U && path[comp_start] == '.' && path[comp_start + 1U] == '.') {
+            return CLKS_FALSE;
+        }
+
+        if (out_pos != 0U) {
+            if (out_pos + 1U >= out_size) {
+                return CLKS_FALSE;
+            }
+            out_internal[out_pos++] = '/';
+        }
+
+        if (out_pos + comp_len >= out_size) {
+            return CLKS_FALSE;
+        }
+
+        clks_memcpy(out_internal + out_pos, path + comp_start, comp_len);
+        out_pos += comp_len;
+
+        while (path[in_pos] == '/') {
+            in_pos++;
+        }
+    }
+
+    out_internal[out_pos] = '\0';
+    return CLKS_TRUE;
+}
+
+static i32 clks_fs_find_node_by_internal(const char *internal_path) {
+    u16 i;
+
+    for (i = 0U; i < clks_fs_nodes_used; i++) {
+        if (clks_fs_nodes[i].used == CLKS_FALSE) {
+            continue;
+        }
+
+        if (clks_strcmp(clks_fs_nodes[i].path, internal_path) == 0) {
+            return (i32)i;
+        }
+    }
+
+    return -1;
+}
+
+static i32 clks_fs_find_node_by_external(const char *external_path) {
+    char internal[CLKS_FS_PATH_MAX];
+
+    if (clks_fs_normalize_external_path(external_path, internal, sizeof(internal)) == CLKS_FALSE) {
+        return -1;
+    }
+
+    return clks_fs_find_node_by_internal(internal);
+}
+
+static const char *clks_fs_basename(const char *internal_path) {
+    usize len;
+    usize i;
+
+    if (internal_path == CLKS_NULL) {
+        return "";
+    }
+
+    len = clks_strlen(internal_path);
+
+    if (len == 0U) {
+        return "";
+    }
+
+    for (i = len; i != 0U; i--) {
+        if (internal_path[i - 1U] == '/') {
+            return &internal_path[i];
+        }
+    }
+
+    return internal_path;
+}
+
+static clks_bool clks_fs_split_parent(const char *internal_path, char *parent_out, usize parent_out_size) {
+    usize len;
+    usize i;
+
+    if (internal_path == CLKS_NULL || parent_out == CLKS_NULL || parent_out_size == 0U) {
+        return CLKS_FALSE;
+    }
+
+    len = clks_strlen(internal_path);
+
+    if (len == 0U) {
+        parent_out[0] = '\0';
+        return CLKS_TRUE;
+    }
+
+    for (i = len; i != 0U; i--) {
+        if (internal_path[i - 1U] == '/') {
+            usize parent_len = i - 1U;
+
+            if (parent_len >= parent_out_size) {
+                return CLKS_FALSE;
+            }
+
+            clks_memcpy(parent_out, internal_path, parent_len);
+            parent_out[parent_len] = '\0';
+            return CLKS_TRUE;
+        }
+    }
+
+    parent_out[0] = '\0';
+    return CLKS_TRUE;
+}
+
+static i32 clks_fs_create_or_update_node(const char *internal_path,
+                                         enum clks_fs_node_type type,
+                                         u16 parent,
+                                         const void *data,
+                                         u64 size) {
+    i32 existing;
+    usize path_len;
+
+    if (internal_path == CLKS_NULL) {
+        return -1;
+    }
+
+    path_len = clks_strlen(internal_path);
+
+    if (path_len >= CLKS_FS_PATH_MAX) {
+        return -1;
+    }
+
+    existing = clks_fs_find_node_by_internal(internal_path);
+
+    if (existing >= 0) {
+        struct clks_fs_node *node = &clks_fs_nodes[(u16)existing];
+
+        if (node->type != type) {
+            return -1;
+        }
+
+        node->parent = parent;
+
+        if (type == CLKS_FS_NODE_FILE) {
+            node->data = data;
+            node->size = size;
+        }
+
+        return existing;
+    }
+
+    if (clks_fs_nodes_used >= CLKS_FS_MAX_NODES) {
+        return -1;
+    }
+
+    clks_fs_nodes[clks_fs_nodes_used].used = CLKS_TRUE;
+    clks_fs_nodes[clks_fs_nodes_used].type = type;
+    clks_fs_nodes[clks_fs_nodes_used].parent = parent;
+    clks_fs_nodes[clks_fs_nodes_used].reserved = 0U;
+    clks_fs_nodes[clks_fs_nodes_used].data = (type == CLKS_FS_NODE_FILE) ? data : CLKS_NULL;
+    clks_fs_nodes[clks_fs_nodes_used].size = (type == CLKS_FS_NODE_FILE) ? size : 0ULL;
+    clks_memcpy(clks_fs_nodes[clks_fs_nodes_used].path, internal_path, path_len + 1U);
+
+    clks_fs_nodes_used++;
+    return (i32)(clks_fs_nodes_used - 1U);
+}
+
+static clks_bool clks_fs_ensure_root(void) {
+    if (clks_fs_create_or_update_node("", CLKS_FS_NODE_DIR, 0U, CLKS_NULL, 0ULL) != 0) {
+        return CLKS_FALSE;
+    }
+
+    return CLKS_TRUE;
+}
+
+static clks_bool clks_fs_ensure_dir_hierarchy(const char *internal_dir_path) {
+    char prefix[CLKS_FS_PATH_MAX];
+    usize cursor = 0;
+    usize i = 0;
+    u16 current_parent = 0U;
+
+    prefix[0] = '\0';
+
+    if (internal_dir_path == CLKS_NULL) {
+        return CLKS_FALSE;
+    }
+
+    if (internal_dir_path[0] == '\0') {
+        return CLKS_TRUE;
+    }
+
+    while (internal_dir_path[i] != '\0') {
+        usize comp_start = i;
+        usize comp_len;
+        i32 node_index;
+
+        while (internal_dir_path[i] != '\0' && internal_dir_path[i] != '/') {
+            i++;
+        }
+
+        comp_len = i - comp_start;
+
+        if (comp_len == 0U) {
+            return CLKS_FALSE;
+        }
+
+        if (cursor != 0U) {
+            if (cursor + 1U >= sizeof(prefix)) {
+                return CLKS_FALSE;
+            }
+            prefix[cursor++] = '/';
+        }
+
+        if (cursor + comp_len >= sizeof(prefix)) {
+            return CLKS_FALSE;
+        }
+
+        clks_memcpy(prefix + cursor, internal_dir_path + comp_start, comp_len);
+        cursor += comp_len;
+        prefix[cursor] = '\0';
+
+        node_index = clks_fs_find_node_by_internal(prefix);
+
+        if (node_index < 0) {
+            node_index = clks_fs_create_or_update_node(prefix, CLKS_FS_NODE_DIR, current_parent, CLKS_NULL, 0ULL);
+
+            if (node_index < 0) {
+                return CLKS_FALSE;
+            }
+        } else if (clks_fs_nodes[(u16)node_index].type != CLKS_FS_NODE_DIR) {
+            return CLKS_FALSE;
+        }
+
+        current_parent = (u16)node_index;
+
+        if (internal_dir_path[i] == '/') {
+            i++;
+        }
+    }
+
+    return CLKS_TRUE;
+}
+
+static clks_bool clks_fs_require_directory(const char *external_path) {
+    i32 node_index = clks_fs_find_node_by_external(external_path);
+
+    if (node_index < 0) {
+        clks_log(CLKS_LOG_ERROR, "FS", "MISSING REQUIRED DIRECTORY");
+        clks_log(CLKS_LOG_ERROR, "FS", external_path);
+        return CLKS_FALSE;
+    }
+
+    if (clks_fs_nodes[(u16)node_index].type != CLKS_FS_NODE_DIR) {
+        clks_log(CLKS_LOG_ERROR, "FS", "REQUIRED PATH IS NOT DIRECTORY");
+        clks_log(CLKS_LOG_ERROR, "FS", external_path);
+        return CLKS_FALSE;
+    }
+
+    return CLKS_TRUE;
+}
+
+static clks_bool clks_fs_ramdisk_visit(const struct clks_ramdisk_entry *entry, void *ctx) {
+    struct clks_fs_build_stats *stats = (struct clks_fs_build_stats *)ctx;
+
+    if (entry == CLKS_NULL || stats == CLKS_NULL) {
+        return CLKS_FALSE;
+    }
+
+    if (entry->type == CLKS_RAMDISK_ENTRY_DIR) {
+        if (clks_fs_ensure_dir_hierarchy(entry->path) == CLKS_FALSE) {
+            return CLKS_FALSE;
+        }
+
+        stats->dir_count++;
+        return CLKS_TRUE;
+    }
+
+    if (entry->type == CLKS_RAMDISK_ENTRY_FILE) {
+        char parent[CLKS_FS_PATH_MAX];
+        i32 parent_index;
+
+        if (clks_fs_split_parent(entry->path, parent, sizeof(parent)) == CLKS_FALSE) {
+            return CLKS_FALSE;
+        }
+
+        if (clks_fs_ensure_dir_hierarchy(parent) == CLKS_FALSE) {
+            return CLKS_FALSE;
+        }
+
+        parent_index = clks_fs_find_node_by_internal(parent);
+
+        if (parent_index < 0) {
+            return CLKS_FALSE;
+        }
+
+        if (clks_fs_create_or_update_node(entry->path,
+                                          CLKS_FS_NODE_FILE,
+                                          (u16)parent_index,
+                                          entry->data,
+                                          entry->size) < 0) {
+            return CLKS_FALSE;
+        }
+
+        stats->file_count++;
+        return CLKS_TRUE;
+    }
+
+    return CLKS_TRUE;
+}
+
+void clks_fs_init(void) {
+    const struct limine_file *module;
+    struct clks_fs_build_stats stats;
+    u64 module_count;
+
+    clks_fs_ready = CLKS_FALSE;
+    clks_fs_nodes_used = 0U;
+    clks_memset(clks_fs_nodes, 0, sizeof(clks_fs_nodes));
+    clks_memset(&stats, 0, sizeof(stats));
+
+    if (clks_fs_ensure_root() == CLKS_FALSE) {
+        clks_log(CLKS_LOG_ERROR, "FS", "FAILED TO CREATE ROOT NODE");
+        return;
+    }
+
+    module_count = clks_boot_get_module_count();
+
+    if (module_count == 0ULL) {
+        clks_log(CLKS_LOG_ERROR, "FS", "NO RAMDISK MODULE FROM LIMINE");
+        return;
+    }
+
+    module = clks_boot_get_module(0ULL);
+
+    if (module == CLKS_NULL || module->address == CLKS_NULL || module->size == 0ULL) {
+        clks_log(CLKS_LOG_ERROR, "FS", "INVALID RAMDISK MODULE");
+        return;
+    }
+
+    if (clks_ramdisk_iterate(module->address, module->size, clks_fs_ramdisk_visit, &stats) == CLKS_FALSE) {
+        clks_log(CLKS_LOG_ERROR, "FS", "RAMDISK TAR PARSE FAILED");
+        return;
+    }
+
+    clks_log(CLKS_LOG_INFO, "FS", "RAMDISK VFS ONLINE");
+    clks_log_hex(CLKS_LOG_INFO, "FS", "MODULE_SIZE", module->size);
+    clks_log_hex(CLKS_LOG_INFO, "FS", "NODE_COUNT", (u64)clks_fs_nodes_used);
+    clks_log_hex(CLKS_LOG_INFO, "FS", "FILE_COUNT", stats.file_count);
+
+    if (clks_fs_require_directory("/system") == CLKS_FALSE) {
+        return;
+    }
+
+    if (clks_fs_require_directory("/shell") == CLKS_FALSE) {
+        return;
+    }
+
+    if (clks_fs_require_directory("/temp") == CLKS_FALSE) {
+        return;
+    }
+
+    if (clks_fs_require_directory("/driver") == CLKS_FALSE) {
+        return;
+    }
+
+    clks_fs_ready = CLKS_TRUE;
+    clks_log(CLKS_LOG_INFO, "FS", "LAYOUT /SYSTEM /SHELL /TEMP /DRIVER OK");
+}
+
+clks_bool clks_fs_is_ready(void) {
+    return clks_fs_ready;
+}
+
+clks_bool clks_fs_stat(const char *path, struct clks_fs_node_info *out_info) {
+    i32 node_index;
+
+    if (clks_fs_ready == CLKS_FALSE || out_info == CLKS_NULL) {
+        return CLKS_FALSE;
+    }
+
+    node_index = clks_fs_find_node_by_external(path);
+
+    if (node_index < 0) {
+        return CLKS_FALSE;
+    }
+
+    out_info->type = clks_fs_nodes[(u16)node_index].type;
+    out_info->size = clks_fs_nodes[(u16)node_index].size;
+    return CLKS_TRUE;
+}
+
+const void *clks_fs_read_all(const char *path, u64 *out_size) {
+    i32 node_index;
+
+    if (clks_fs_ready == CLKS_FALSE) {
+        return CLKS_NULL;
+    }
+
+    node_index = clks_fs_find_node_by_external(path);
+
+    if (node_index < 0) {
+        return CLKS_NULL;
+    }
+
+    if (clks_fs_nodes[(u16)node_index].type != CLKS_FS_NODE_FILE) {
+        return CLKS_NULL;
+    }
+
+    if (out_size != CLKS_NULL) {
+        *out_size = clks_fs_nodes[(u16)node_index].size;
+    }
+
+    return clks_fs_nodes[(u16)node_index].data;
+}
+
+u64 clks_fs_count_children(const char *dir_path) {
+    i32 dir_index;
+    u64 count = 0ULL;
+    u16 i;
+
+    if (clks_fs_ready == CLKS_FALSE) {
+        return 0ULL;
+    }
+
+    dir_index = clks_fs_find_node_by_external(dir_path);
+
+    if (dir_index < 0) {
+        return 0ULL;
+    }
+
+    if (clks_fs_nodes[(u16)dir_index].type != CLKS_FS_NODE_DIR) {
+        return 0ULL;
+    }
+
+    for (i = 0U; i < clks_fs_nodes_used; i++) {
+        if (clks_fs_nodes[i].used == CLKS_FALSE) {
+            continue;
+        }
+
+        if ((u16)dir_index == i) {
+            continue;
+        }
+
+        if (clks_fs_nodes[i].parent == (u16)dir_index) {
+            count++;
+        }
+    }
+
+    return count;
+}
+
+clks_bool clks_fs_get_child_name(const char *dir_path, u64 index, char *out_name, usize out_name_size) {
+    i32 dir_index;
+    u64 current = 0ULL;
+    u16 i;
+
+    if (clks_fs_ready == CLKS_FALSE || out_name == CLKS_NULL || out_name_size == 0U) {
+        return CLKS_FALSE;
+    }
+
+    dir_index = clks_fs_find_node_by_external(dir_path);
+
+    if (dir_index < 0 || clks_fs_nodes[(u16)dir_index].type != CLKS_FS_NODE_DIR) {
+        return CLKS_FALSE;
+    }
+
+    for (i = 0U; i < clks_fs_nodes_used; i++) {
+        const char *base;
+        usize base_len;
+
+        if (clks_fs_nodes[i].used == CLKS_FALSE) {
+            continue;
+        }
+
+        if ((u16)dir_index == i) {
+            continue;
+        }
+
+        if (clks_fs_nodes[i].parent != (u16)dir_index) {
+            continue;
+        }
+
+        if (current != index) {
+            current++;
+            continue;
+        }
+
+        base = clks_fs_basename(clks_fs_nodes[i].path);
+        base_len = clks_strlen(base);
+
+        if (base_len + 1U > out_name_size) {
+            return CLKS_FALSE;
+        }
+
+        clks_memcpy(out_name, base, base_len + 1U);
+        return CLKS_TRUE;
+    }
+
+    return CLKS_FALSE;
+}
+
+u64 clks_fs_node_count(void) {
+    if (clks_fs_ready == CLKS_FALSE) {
+        return 0ULL;
+    }
+
+    return (u64)clks_fs_nodes_used;
+}

clks/kernel/kmain.c

@@ -2,6 +2,7 @@
 #include <clks/cpu.h>
 #include <clks/elfrunner.h>
 #include <clks/framebuffer.h>
+#include <clks/fs.h>
 #include <clks/heap.h>
 #include <clks/interrupts.h>
 #include <clks/kernel.h>
@@ -19,8 +20,10 @@ void clks_kernel_main(void) {
     struct clks_pmm_stats pmm_stats;
     struct clks_heap_stats heap_stats;
     struct clks_scheduler_stats sched_stats;
+    struct clks_fs_node_info fs_system_dir = {0};
     void *heap_probe = CLKS_NULL;
     u64 syscall_ticks;
+    u64 fs_root_children;
 
     clks_serial_init();
 
@@ -36,7 +39,7 @@ void clks_kernel_main(void) {
         clks_tty_init();
     }
 
-    clks_log(CLKS_LOG_INFO, "BOOT", "CLEONOS STAGE5 START");
+    clks_log(CLKS_LOG_INFO, "BOOT", "CLEONOS STAGE6 START");
 
     if (boot_fb == CLKS_NULL) {
         clks_log(CLKS_LOG_WARN, "VIDEO", "NO FRAMEBUFFER FROM LIMINE");
@@ -83,6 +86,21 @@ void clks_kernel_main(void) {
         clks_kfree(heap_probe);
     }
 
+    clks_fs_init();
+
+    if (clks_fs_is_ready() == CLKS_FALSE) {
+        clks_log(CLKS_LOG_ERROR, "FS", "RAMDISK FS INIT FAILED");
+        clks_cpu_halt_forever();
+    }
+
+    fs_root_children = clks_fs_count_children("/");
+    clks_log_hex(CLKS_LOG_INFO, "FS", "ROOT_CHILDREN", fs_root_children);
+
+    if (clks_fs_stat("/system", &fs_system_dir) == CLKS_FALSE || fs_system_dir.type != CLKS_FS_NODE_DIR) {
+        clks_log(CLKS_LOG_ERROR, "FS", "/SYSTEM DIRECTORY CHECK FAILED");
+        clks_cpu_halt_forever();
+    }
+
     clks_scheduler_init();
 
     if (clks_scheduler_add_kernel_task("klogd", 4U) == CLKS_FALSE) {
@@ -115,3 +133,4 @@ void clks_kernel_main(void) {
 
     clks_cpu_halt_forever();
 }
+

clks/kernel/limine_requests.c

@@ -28,6 +28,13 @@ CLKS_USED static volatile struct limine_executable_file_request limine_executabl
         .response = CLKS_NULL,
     };
 
+CLKS_USED static volatile struct limine_module_request limine_module_request
+    __attribute__((section(".limine_requests"))) = {
+        .id = LIMINE_MODULE_REQUEST,
+        .revision = 0,
+        .response = CLKS_NULL,
+    };
+
 CLKS_USED static volatile u64 limine_requests_end[]
     __attribute__((section(".limine_requests_end"))) = LIMINE_REQUESTS_END_MARKER;
 
@@ -68,3 +75,27 @@ const struct limine_file *clks_boot_get_executable_file(void) {
 
     return request->response->executable_file;
 }
+
+u64 clks_boot_get_module_count(void) {
+    volatile struct limine_module_request *request = &limine_module_request;
+
+    if (request->response == CLKS_NULL) {
+        return 0ULL;
+    }
+
+    return request->response->module_count;
+}
+
+const struct limine_file *clks_boot_get_module(u64 index) {
+    volatile struct limine_module_request *request = &limine_module_request;
+
+    if (request->response == CLKS_NULL) {
+        return CLKS_NULL;
+    }
+
+    if (index >= request->response->module_count) {
+        return CLKS_NULL;
+    }
+
+    return request->response->modules[index];
+}

clks/kernel/ramdisk.c

@@ -0,0 +1,221 @@
+#include <clks/compiler.h>
+#include <clks/ramdisk.h>
+#include <clks/string.h>
+#include <clks/types.h>
+
+#define CLKS_TAR_BLOCK_SIZE 512ULL
+
+struct clks_tar_header {
+    char name[100];
+    char mode[8];
+    char uid[8];
+    char gid[8];
+    char size[12];
+    char mtime[12];
+    char chksum[8];
+    char typeflag;
+    char linkname[100];
+    char magic[6];
+    char version[2];
+    char uname[32];
+    char gname[32];
+    char devmajor[8];
+    char devminor[8];
+    char prefix[155];
+    char pad[12];
+} CLKS_PACKED;
+
+static clks_bool clks_ramdisk_is_zero_block(const u8 *block) {
+    u64 i;
+
+    for (i = 0; i < CLKS_TAR_BLOCK_SIZE; i++) {
+        if (block[i] != 0U) {
+            return CLKS_FALSE;
+        }
+    }
+
+    return CLKS_TRUE;
+}
+
+static usize clks_ramdisk_field_len(const char *field, usize max_len) {
+    usize i = 0;
+
+    while (i < max_len && field[i] != '\0') {
+        i++;
+    }
+
+    return i;
+}
+
+static clks_bool clks_ramdisk_parse_octal_u64(const char *field, usize len, u64 *out_value) {
+    usize i = 0;
+    u64 value = 0ULL;
+
+    if (out_value == CLKS_NULL) {
+        return CLKS_FALSE;
+    }
+
+    while (i < len && (field[i] == ' ' || field[i] == '\0')) {
+        i++;
+    }
+
+    for (; i < len; i++) {
+        char ch = field[i];
+
+        if (ch == ' ' || ch == '\0') {
+            break;
+        }
+
+        if (ch < '0' || ch > '7') {
+            return CLKS_FALSE;
+        }
+
+        if (value > (0xffffffffffffffffULL >> 3)) {
+            return CLKS_FALSE;
+        }
+
+        value = (value << 3) + (u64)(ch - '0');
+    }
+
+    *out_value = value;
+    return CLKS_TRUE;
+}
+
+static clks_bool clks_ramdisk_build_path(const struct clks_tar_header *hdr, char *out_path, usize out_path_size) {
+    char raw[CLKS_RAMDISK_PATH_MAX];
+    usize prefix_len;
+    usize name_len;
+    usize cursor = 0;
+    usize read_pos = 0;
+    usize out_cursor = 0;
+
+    if (hdr == CLKS_NULL || out_path == CLKS_NULL || out_path_size == 0U) {
+        return CLKS_FALSE;
+    }
+
+    raw[0] = '\0';
+    out_path[0] = '\0';
+
+    prefix_len = clks_ramdisk_field_len(hdr->prefix, sizeof(hdr->prefix));
+    name_len = clks_ramdisk_field_len(hdr->name, sizeof(hdr->name));
+
+    if (name_len == 0U) {
+        return CLKS_FALSE;
+    }
+
+    if (prefix_len != 0U) {
+        if (prefix_len + 1U >= sizeof(raw)) {
+            return CLKS_FALSE;
+        }
+
+        clks_memcpy(raw, hdr->prefix, prefix_len);
+        cursor = prefix_len;
+        raw[cursor++] = '/';
+    }
+
+    if (cursor + name_len >= sizeof(raw)) {
+        return CLKS_FALSE;
+    }
+
+    clks_memcpy(raw + cursor, hdr->name, name_len);
+    cursor += name_len;
+    raw[cursor] = '\0';
+
+    while ((raw[read_pos] == '.' && raw[read_pos + 1U] == '/') || raw[read_pos] == '/') {
+        if (raw[read_pos] == '.') {
+            read_pos += 2U;
+        } else {
+            read_pos++;
+        }
+    }
+
+    while (raw[read_pos] != '\0' && out_cursor + 1U < out_path_size) {
+        out_path[out_cursor++] = raw[read_pos++];
+    }
+
+    if (raw[read_pos] != '\0') {
+        return CLKS_FALSE;
+    }
+
+    while (out_cursor > 0U && out_path[out_cursor - 1U] == '/') {
+        out_cursor--;
+    }
+
+    out_path[out_cursor] = '\0';
+
+    if (out_cursor == 0U) {
+        return CLKS_FALSE;
+    }
+
+    return CLKS_TRUE;
+}
+
+clks_bool clks_ramdisk_iterate(const void *image, u64 image_size, clks_ramdisk_iter_fn iter_fn, void *ctx) {
+    const u8 *bytes = (const u8 *)image;
+    u64 offset = 0ULL;
+
+    if (image == CLKS_NULL || iter_fn == CLKS_NULL) {
+        return CLKS_FALSE;
+    }
+
+    while (offset + CLKS_TAR_BLOCK_SIZE <= image_size) {
+        const struct clks_tar_header *hdr;
+        u64 payload_offset;
+        u64 file_size;
+        u64 aligned_size;
+        struct clks_ramdisk_entry entry;
+        clks_bool emit = CLKS_FALSE;
+
+        hdr = (const struct clks_tar_header *)(bytes + offset);
+
+        if (clks_ramdisk_is_zero_block((const u8 *)hdr) == CLKS_TRUE) {
+            break;
+        }
+
+        if (clks_ramdisk_parse_octal_u64(hdr->size, sizeof(hdr->size), &file_size) == CLKS_FALSE) {
+            return CLKS_FALSE;
+        }
+
+        payload_offset = offset + CLKS_TAR_BLOCK_SIZE;
+
+        if (payload_offset > image_size) {
+            return CLKS_FALSE;
+        }
+
+        if (file_size > (image_size - payload_offset)) {
+            return CLKS_FALSE;
+        }
+
+        clks_memset(&entry, 0, sizeof(entry));
+
+        if (clks_ramdisk_build_path(hdr, entry.path, sizeof(entry.path)) == CLKS_TRUE) {
+            if (hdr->typeflag == '5') {
+                entry.type = CLKS_RAMDISK_ENTRY_DIR;
+                entry.data = CLKS_NULL;
+                entry.size = 0ULL;
+                emit = CLKS_TRUE;
+            } else if (hdr->typeflag == '\0' || hdr->typeflag == '0') {
+                entry.type = CLKS_RAMDISK_ENTRY_FILE;
+                entry.data = (const void *)(bytes + payload_offset);
+                entry.size = file_size;
+                emit = CLKS_TRUE;
+            }
+        }
+
+        if (emit == CLKS_TRUE) {
+            if (iter_fn(&entry, ctx) == CLKS_FALSE) {
+                return CLKS_FALSE;
+            }
+        }
+
+        aligned_size = (file_size + (CLKS_TAR_BLOCK_SIZE - 1ULL)) & ~(CLKS_TAR_BLOCK_SIZE - 1ULL);
+
+        if (payload_offset + aligned_size < payload_offset) {
+            return CLKS_FALSE;
+        }
+
+        offset = payload_offset + aligned_size;
+    }
+
+    return CLKS_TRUE;
+}

docs/stage6.md

@@ -0,0 +1,35 @@
+# CLeonOS Stage6
+
+## Stage Goal
+- Add ramdisk filesystem foundation in CLKS based on the Limine module.
+- Parse tar-format ramdisk and build hierarchical directory/file nodes.
+- Provide VFS-style path interfaces for stat/read/list operations.
+- Enforce required root layout: `/system`, `/shell`, `/temp`, `/driver`.
+
+## Acceptance Criteria
+- Kernel boots and prints `CLEONOS STAGE6 START`.
+- Filesystem logs `RAMDISK VFS ONLINE` and node/file statistics.
+- Root layout validation reports `/SYSTEM /SHELL /TEMP /DRIVER OK`.
+- `clks_fs_count_children("/")` returns non-zero and is logged.
+- Kernel continues to scheduler/ELF/syscall/interrupt init without panic.
+
+## Build Targets
+- `make setup`
+- `make iso`
+- `make run`
+- `make debug`
+
+## QEMU Command
+- `qemu-system-x86_64 -M q35 -m 1024M -cdrom build/CLeonOS-x86_64.iso -serial stdio`
+
+## Common Bugs and Debugging
+- `NO RAMDISK MODULE FROM LIMINE`:
+  - Verify `module_path: boot():/boot/cleonos_ramdisk.tar` exists in `configs/limine.conf`.
+- `RAMDISK TAR PARSE FAILED`:
+  - Ensure ramdisk is packed as tar (`make ramdisk`) and module size is not zero.
+- `MISSING REQUIRED DIRECTORY`:
+  - Confirm ramdisk root contains `/system`, `/shell`, `/temp`, `/driver`.
+- Filesystem APIs always fail:
+  - Check `clks_fs_init()` is called and `clks_fs_is_ready()` is true.
+- Build failure on new symbols:
+  - Confirm `ramdisk.c` and `fs.c` are present in `C_SOURCES`.