Cargo.toml

@@ -21,3 +21,6 @@ path = "examples/dark.rs"
 [profile.release]
 opt-level = "z"
 lto = "thin"
+
+[[example]]
+name = "fs_demo"

examples/fs_demo.rs

@@ -0,0 +1,10 @@
+#![no_std]
+#![no_main]
+
+use kos::fs::read_file;
+
+#[no_mangle]
+pub fn kol_main() {
+    let mut buf = [0u8; 256];
+    let _ = read_file(c"/rd/1/readme.txt", &mut buf);
+}

src/fs.rs

@@ -0,0 +1,58 @@
+use core::ffi::CStr;
+use crate::sys::{fs_execute, FsBlock};
+
+fn execute(op: u32, offset: u32, offset_hi: u32, count: u32, buf: *mut u8, path: &CStr) -> Result<(), u32> {
+    let info = FsBlock {
+        operation:  op,
+        offset,
+        offset_hi,
+        byte_count: count,
+        buffer:     buf,
+        _pad:       0,
+        path:       path.as_ptr() as *const u8,
+    };
+    match unsafe { fs_execute(&info) } {
+        0 => Ok(()),
+        e => Err(e),
+    }
+}
+
+pub fn read_file(path: &CStr, buf: &mut [u8]) -> Result<(), u32> {
+    execute(0, 0, 0, buf.len() as u32, buf.as_mut_ptr(), path)
+}
+
+pub fn read_folder(path: &CStr, buf: &mut [u8]) -> Result<(), u32> {
+    execute(1, 0, 0, buf.len() as u32, buf.as_mut_ptr(), path)
+}
+
+pub fn create_file(path: &CStr, buf: &[u8]) -> Result<(), u32> {
+    execute(2, 0, 0, buf.len() as u32, buf.as_ptr() as *mut u8, path)
+}
+
+pub fn write_file(path: &CStr, buf: &[u8]) -> Result<(), u32> {
+    execute(3, 0, 0, buf.len() as u32, buf.as_ptr() as *mut u8, path)
+}
+
+pub fn set_size(path: &CStr, size: u64) -> Result<(), u32> {
+    execute(4, size as u32, (size >> 32) as u32, 0, core::ptr::null_mut(), path)
+}
+
+pub fn get_attributes(path: &CStr, buf: &mut [u8]) -> Result<(), u32> {
+    execute(5, 0, 0, buf.len() as u32, buf.as_mut_ptr(), path)
+}
+
+pub fn set_attributes(path: &CStr, buf: &[u8]) -> Result<(), u32> {
+    execute(6, 0, 0, buf.len() as u32, buf.as_ptr() as *mut u8, path)
+}
+
+pub fn run(path: &CStr) -> Result<(), u32> {
+    execute(7, 0, 0, 0, core::ptr::null_mut(), path)
+}
+
+pub fn delete(path: &CStr) -> Result<(), u32> {
+    execute(8, 0, 0, 0, core::ptr::null_mut(), path)
+}
+
+pub fn create_folder(path: &CStr) -> Result<(), u32> {
+    execute(9, 0, 0, 0, core::ptr::null_mut(), path)
+}

src/func_constants.inc

@@ -20,3 +20,4 @@ SF_SYS_MISC             = 68
     SSF_MEM_ALLOC   = 12
     SSF_MEM_FREE    = 13
     SSF_LOAD_DLL    = 19
+SF_FILE                 = 70

src/lib.rs

@@ -6,6 +6,7 @@ mod nanolibc;
 pub mod allocation;
 pub mod dll;
 pub mod sys;
+pub mod fs;
 
 pub use modules::*;
 

src/sys.rs

@@ -67,4 +67,19 @@ extern "C" {
     // 68.19
     #[link_name = "_load_dll"]
     pub fn load_dll(name: *const u8) -> *const u32;
+
+    // 70
+    #[link_name = "_fs_execute"]
+    pub fn fs_execute(info: *const FsBlock) -> u32;
+}
+
+#[repr(C)]
+pub(crate) struct FsBlock {
+    pub operation:  u32,
+    pub offset:     u32,
+    pub offset_hi:  u32,
+    pub byte_count: u32,
+    pub buffer:     *mut u8,
+    pub _pad:       u8,
+    pub path:       *const u8,
 }

src/syscalls.S

@@ -20,6 +20,7 @@ section '.text'
     public _get_lang
     public _load_dll
     public _set_event_mask
+    public _fs_execute
 
 _exit:
     mov eax, SF_TERMINATE_PROCESS
@@ -143,3 +144,10 @@ _set_event_mask:
     int 0x40
     ret
 
+_fs_execute:
+    push ebx
+    mov eax, SF_FILE
+    mov ebx, [esp + 4 * 2]
+    int 0x40
+    pop ebx
+    ret