1 files changed, 98 insertions, 0 deletions
diff --git a/i386/i386/percpu.h b/i386/i386/percpu.h
new file mode 100644
index 00000000..637d2ca6
--- /dev/null
+++ b/i386/i386/percpu.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2023 Free Software Foundation, Inc.
+ *
+ * This program 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 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _PERCPU_H_
+#define _PERCPU_H_
+
+struct percpu;
+
+#if NCPUS > 1
+
+#define percpu_assign(stm, val)     \
+    asm("mov %[src], %%gs:%c[offs]" \
+         : /* No outputs */         \
+         : [src] "r" (val), [offs] "e" (__builtin_offsetof(struct percpu, stm)) \
+         : );
+
+#define percpu_get(typ, stm)        \
+MACRO_BEGIN                         \
+    typ val_;                       \
+                                    \
+    asm("mov %%gs:%c[offs], %[dst]" \
+         : [dst] "=r" (val_)        \
+         : [offs] "e" (__builtin_offsetof(struct percpu, stm)) \
+         : );                       \
+                                    \
+    val_;                           \
+MACRO_END
+
+#define percpu_ptr(typ, stm)        \
+MACRO_BEGIN                         \
+    typ *ptr_ = (typ *)__builtin_offsetof(struct percpu, stm); \
+                                    \
+    asm("add %%gs:0, %[pointer]"    \
+         : [pointer] "+r" (ptr_)    \
+         : /* No inputs */          \
+         : );                       \
+                                    \
+    ptr_;                           \
+MACRO_END
+
+#else
+
+#define percpu_assign(stm, val)     \
+MACRO_BEGIN                         \
+        percpu_array[0].stm = val;  \
+MACRO_END
+#define percpu_get(typ, stm)        \
+        (percpu_array[0].stm)
+#define percpu_ptr(typ, stm)        \
+        (&percpu_array[0].stm)
+
+#endif
+
+#include <kern/processor.h>
+#include <mach/mach_types.h>
+
+struct percpu {
+    struct percpu	*self;
+    int			apic_id;
+    int			cpu_id;
+    struct processor	processor;
+    thread_t		active_thread;
+    vm_offset_t		active_stack;
+/*
+    struct machine_slot	machine_slot;
+    struct mp_desc_table mp_desc_table;
+    vm_offset_t		int_stack_top;
+    vm_offset_t		int_stack_base;
+    ast_t		need_ast;
+    ipc_kmsg_t		ipc_kmsg_cache;
+    pmap_update_list	cpu_update_list;
+    spl_t		saved_ipl;
+    spl_t		curr_ipl;
+    timer_data_t	kernel_timer;
+    timer_t		current_timer;
+    unsigned long	in_interrupt;
+*/
+};
+
+extern struct percpu percpu_array[NCPUS];
+
+void init_percpu(int cpu);
+
+#endif /* _PERCPU_H_ */