kern: vm: Add serialized TLSF frontend

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 81 insertions, 0 deletions

diff --git a/sys/vm/vm_kalloc.c b/sys/vm/vm_kalloc.c
new file mode 100644
index 0000000..39cf08b
--- /dev/null
+++ b/sys/vm/vm_kalloc.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <kern/panic.h>
+#include <vm/kalloc.h>
+#include <vm/tlsf.h>
+#include <vm/phys.h>
+#include <mu/spinlock.h>
+#include <vm/vm.h>
+
+#define MEM_SIZE 0x200000
+
+/*
+ * XXX: This lock is shared globally, it might be a better
+ *      idea to move the whole context per core sometime
+ *      soon?
+ */
+static volatile size_t lock = 0;
+static tlsf_t ctx;
+
+void *
+kalloc(size_t sz)
+{
+    void *tmp;
+
+    mu_spinlock_acq(&lock, 0);
+    tmp = tlsf_malloc(ctx, sz);
+    mu_spinlock_rel(&lock, 0);
+    return tmp;
+}
+
+void
+kfree(void *ptr)
+{
+    mu_spinlock_acq(&lock, 0);
+    tlsf_free(ctx, ptr);
+    mu_spinlock_rel(&lock, 0);
+}
+
+void
+vm_kalloc_init(void)
+{
+    uintptr_t phys, *virt;
+
+    phys = vm_phys_alloc(MEM_SIZE / 4096);
+    if (phys == 0) {
+        panic("kalloc: could not allocate pages\n");
+    }
+
+    virt = PHYS_TO_VIRT(phys);
+    ctx = tlsf_create_with_pool(virt, MEM_SIZE);
+    if (ctx == NULL) {
+        panic("kalloc: could not init context\n");
+    }
+}