remove refcout functions

src/Cargo.lock

@@ -25,7 +25,7 @@ checksum = "3b43422f69d8ff38f95f1b2bb76517c91589a924d1559a0e935d7c8ce0274c11"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.98",
 ]
 
 [[package]]
@@ -34,6 +34,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "base64"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
+
 [[package]]
 name = "bit_field"
 version = "0.10.1"
@@ -80,6 +86,12 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "const-default"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b396d1f76d455557e1218ec8066ae14bba60b4b36ecd55577ba979f5db7ecaa"
+
 [[package]]
 name = "core_io"
 version = "0.1.0"
@@ -106,7 +118,7 @@ version = "0.0.0"
 dependencies = [
  "cfg-if 0.1.10",
  "cslice",
- "libc",
+ "libc 0.1.0",
  "unwind",
 ]
 
@@ -183,7 +195,7 @@ checksum = "162ee34ebcb7c64a8abebc059ce0fee27c2262618d7b60ed8faf72fef13c3650"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.98",
 ]
 
 [[package]]
@@ -235,7 +247,7 @@ dependencies = [
  "libasync",
  "libboard_artiq",
  "libboard_zynq",
- "libc",
+ "libc 0.1.0",
  "libconfig",
  "libcortex_a9",
  "libm",
@@ -304,6 +316,12 @@ dependencies = [
  "libboard_zynq",
 ]
 
+[[package]]
+name = "libc"
+version = "0.2.174"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1171693293099992e19cddea4e8b849964e9846f4acee11b3948bcc337be8776"
+
 [[package]]
 name = "libconfig"
 version = "0.1.0"
@@ -320,6 +338,7 @@ version = "0.0.0"
 dependencies = [
  "bit_field",
  "libregister",
+ "log",
  "volatile-register",
 ]
 
@@ -346,16 +365,10 @@ dependencies = [
  "libboard_zynq",
  "libcortex_a9",
  "libregister",
- "linked_list_allocator",
  "r0",
+ "rlsf",
 ]
 
-[[package]]
-name = "linked_list_allocator"
-version = "0.8.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "822add9edb1860698b79522510da17bef885171f75aa395cff099d770c609c24"
-
 [[package]]
 name = "log"
 version = "0.4.14"
@@ -422,7 +435,7 @@ checksum = "ed3955f1a9c7c0c15e092f9c887db08b1fc683305fdf6eb6684f22555355e202"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.98",
 ]
 
 [[package]]
@@ -497,6 +510,18 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bd7a31eed1591dcbc95d92ad7161908e72f4677f8fabf2a32ca49b4237cbf211"
 
+[[package]]
+name = "rlsf"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "222fb240c3286247ecdee6fa5341e7cdad0ffdf8e7e401d9937f2d58482a20bf"
+dependencies = [
+ "cfg-if 1.0.0",
+ "const-default",
+ "libc 0.2.174",
+ "svgbobdoc",
+]
+
 [[package]]
 name = "runtime"
 version = "0.1.0"
@@ -516,7 +541,7 @@ dependencies = [
  "libasync",
  "libboard_artiq",
  "libboard_zynq",
- "libc",
+ "libc 0.1.0",
  "libconfig",
  "libcortex_a9",
  "libregister",
@@ -547,7 +572,7 @@ dependencies = [
  "libasync",
  "libboard_artiq",
  "libboard_zynq",
- "libc",
+ "libc 0.1.0",
  "libconfig",
  "libcortex_a9",
  "libregister",
@@ -579,6 +604,30 @@ dependencies = [
  "managed",
 ]
 
+[[package]]
+name = "svgbobdoc"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2c04b93fc15d79b39c63218f15e3fdffaa4c227830686e3b7c5f41244eb3e50"
+dependencies = [
+ "base64",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "unicode-width",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.98"
@@ -612,13 +661,19 @@ version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
 
+[[package]]
+name = "unicode-width"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
+
 [[package]]
 name = "unwind"
 version = "0.0.0"
 dependencies = [
  "cc",
  "cfg-if 0.1.10",
- "libc",
+ "libc 0.1.0",
 ]
 
 [[package]]

src/libksupport/src/kernel/api.rs

@@ -118,9 +118,7 @@ pub fn resolve(required: &[u8]) -> Option<u32> {
         api!(i2c_read = i2c::read),
         api!(i2c_switch_select = i2c::switch_select),
 
-        // dynamic memory allocation and reference counting
-        api!(nac3_rc_incr = mem::nac3_rc_incr),
-        api!(nac3_rc_decr = mem::nac3_rc_decr),
+        // dynamic memory allocation
         api!(nac3_malloc = mem::nac3_malloc),
 
         // subkernel

src/libksupport/src/kernel/mem.rs

@@ -14,21 +14,7 @@ pub unsafe extern "C" fn nac3_malloc(size: usize) -> *mut u8 {
     rc_ptr.add(1).cast()
 }
 
-pub unsafe extern "C" fn nac3_rc_incr(ptr: *mut u8) {
-    let ptr = ptr.cast::<usize>().sub(1);
-    *ptr += 1;
-}
-
-pub unsafe extern "C" fn nac3_rc_decr(ptr: *mut u8) {
-    let rc_ptr = ptr.cast::<usize>().sub(1);
-    *rc_ptr -= 1;
-
-    if *ptr == 0 {
-        nac3_free(ptr);
-    }
-}
-
-pub unsafe fn nac3_free(ptr: *mut u8) {
+pub unsafe extern "C" fn nac3_free(ptr: *mut u8) {
     let size_ptr = ptr.sub(2 * mem::size_of::<usize>()).cast::<usize>();
 
     dealloc(