kernel: proc: Add Process Control Block structure

This is to be implemented per arch and has arch specific
thread information. For example, on the AMD64 port, this can contain
things like an x87 FPU save area

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

2 files changed, 41 insertions, 0 deletions

diff --git a/sys/include/arch/amd64/pcb.h b/sys/include/arch/amd64/pcb.h
new file mode 100644
index 0000000..0e0aab8
--- /dev/null
+++ b/sys/include/arch/amd64/pcb.h
@@ -0,0 +1,39 @@
+/*
+ * 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.
+ */
+
+#ifndef _AMD64_PCB_H_
+#define _AMD64_PCB_H_
+
+#include <sys/types.h>
+
+struct pcb {
+    uint8_t *fpu_state;
+};
+
+#endif  /* !_AMD64_PCB_H_ */
diff --git a/sys/include/sys/proc.h b/sys/include/sys/proc.h
index 0d3b45e..34a5037 100644
--- a/sys/include/sys/proc.h
+++ b/sys/include/sys/proc.h
@@ -34,6 +34,7 @@
 #include <sys/queue.h>
 #include <machine/cpu.h>
 #include <machine/frame.h>
+#include <machine/pcb.h>
 #include <vm/vm.h>
 
 /*
@@ -44,6 +45,7 @@ struct proc {
     pid_t pid;
     struct cpu_info *cpu;
     struct trapframe *tf;
+    struct pcb pcb;
     struct vas addrsp;
     TAILQ_ENTRY(proc) link;
 };