1 // SPDX-License-Identifier: LGPL-2.1 OR BSD-2-Clause 2 /* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */ 3 #include <libarena/common.h> 4 #include <libarena/asan.h> 5 #include <libarena/buddy.h> 6 7 const volatile u32 zero = 0; 8 9 struct buddy __arena buddy; 10 11 int arena_fls(__u64 word) 12 { 13 if (!word) 14 return 0; 15 16 return 64 - __builtin_clzll(word); 17 } 18 19 SEC("syscall") 20 __weak int arena_get_info(struct arena_get_info_args *args) 21 { 22 args->arena_base = arena_base(&arena); 23 24 return 0; 25 } 26 27 SEC("syscall") 28 __weak int arena_alloc_reserve(struct arena_alloc_reserve_args *args) 29 { 30 return bpf_arena_reserve_pages(&arena, NULL, args->nr_pages); 31 } 32 33 SEC("syscall") 34 __weak int arena_buddy_reset(void) 35 { 36 buddy_destroy(&buddy); 37 38 return buddy_init(&buddy); 39 } 40 41 __weak void __arena *arena_malloc(size_t size) 42 { 43 return buddy_alloc(&buddy, size); 44 } 45 46 __weak void arena_free(void __arena *ptr) 47 { 48 buddy_free(&buddy, ptr); 49 } 50 51 52 char _license[] SEC("license") = "GPL"; 53