smp: Add generic smp pseudoclass

This pseudoclass generalize the initialization and access of SMP data,
allowing expands it to other architectures. In x86, the functions calls to apic functions.

*kern/smp.c: Source file. Implements a interface to load the SMP functions for the current architecture.
*kern/smp.h: Header file. Add declaration for smp_data structure.
*i386/i386/smp.c: Source file. Implements a set of functions to manage the SMP actions in i386
*i386/i386/smp.h: Header file. Add declarations for SMP functions in i386.

2 files changed, 73 insertions, 0 deletions

diff --git a/kern/smp.c b/kern/smp.c
new file mode 100644
index 00000000..295f7031
--- /dev/null
+++ b/kern/smp.c
@@ -0,0 +1,49 @@
+/* smp.c - Template for generic SMP controller for Mach.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   Written by Almudena Garcia Jurado-Centurion
+
+   This file is part of GNU Mach.
+
+   GNU Mach is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   GNU Mach is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+#include <kern/smp.h>
+#include <machine/smp.h>
+#include <stdint.h>
+
+struct smp_data {
+    uint8_t num_cpus;
+} smp_info;
+
+/*
+ * smp_set_numcpus: initialize the number of cpus in smp_info structure
+ */
+
+void smp_set_numcpus(uint8_t numcpus)
+{
+   smp_info.num_cpus = numcpus;
+}
+
+/*
+ * smp_get_numcpus: returns the number of cpus existing in the machine
+ */
+uint8_t smp_get_numcpus(void)
+{
+   uint8_t numcpus = smp_info.num_cpus;
+
+   if (numcpus == 0)
+      return 1; /* Although SMP doesn't find cpus, always there are at least one. */
+   else
+      return numcpus;
+}
diff --git a/kern/smp.h b/kern/smp.h
new file mode 100644
index 00000000..44e96f39
--- /dev/null
+++ b/kern/smp.h
@@ -0,0 +1,24 @@
+/* smp.h - Template for generic SMP controller for Mach. Header file
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   Written by Almudena Garcia Jurado-Centurion
+
+   This file is part of GNU Mach.
+
+   GNU Mach is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   GNU Mach is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+#include <stdint.h>
+
+void smp_set_numcpus(uint8_t numcpus);
+uint8_t smp_get_numcpus(void);