kernel: Add machine independent CPU routines

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

1 files changed, 70 insertions, 0 deletions

diff --git a/sys/kern/kern_cpu.c b/sys/kern/kern_cpu.c
new file mode 100644
index 0000000..97a7aa4
--- /dev/null
+++ b/sys/kern/kern_cpu.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2023-2024 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 <sys/cpu.h>
+#include <sys/types.h>
+#include <sys/panic.h>
+#include <sys/machdep.h>
+#include <vm/dynalloc.h>
+#include <assert.h>
+
+__MODULE_NAME("kern_cpu");
+__KERNEL_META("$Hyra$: kern_cpu.c, Ian Marco Moffett, "
+              "Machine independent CPU interface");
+
+#define CI_LIST_SZ \
+    sizeof(struct cpu_info *) * (MAXCPUS + 1)
+
+static size_t ncpu = 0;
+static struct cpu_info **ci_list = NULL;
+
+void
+cpu_attach(struct cpu_info *ci)
+{
+    if ((ci->idx = ncpu++) >= (MAXCPUS + 1)) {
+        panic("Machine core count exceeds MAXCPUS!\n");
+    }
+
+    if (ci_list == NULL) {
+        ci_list = dynalloc(CI_LIST_SZ);
+        __assert(ci_list != NULL);
+    }
+
+    ci_list[cpu_index(ci)] = ci;
+}
+
+struct cpu_info *
+cpu_get(size_t i)
+{
+    if (i >= ncpu || ci_list == NULL) {
+        return NULL;
+    }
+
+    return ci_list[i];
+}