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-rw-r--r--mm/init-mm.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/mm/init-mm.c b/mm/init-mm.c
new file mode 100644
index 000000000..c9327abb7
--- /dev/null
+++ b/mm/init-mm.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/mm_types.h>
+#include <linux/maple_tree.h>
+#include <linux/rwsem.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/cpumask.h>
+#include <linux/mman.h>
+#include <linux/pgtable.h>
+
+#include <linux/atomic.h>
+#include <linux/user_namespace.h>
+#include <linux/ioasid.h>
+#include <asm/mmu.h>
+
+#ifndef INIT_MM_CONTEXT
+#define INIT_MM_CONTEXT(name)
+#endif
+
+/*
+ * For dynamically allocated mm_structs, there is a dynamically sized cpumask
+ * at the end of the structure, the size of which depends on the maximum CPU
+ * number the system can see. That way we allocate only as much memory for
+ * mm_cpumask() as needed for the hundreds, or thousands of processes that
+ * a system typically runs.
+ *
+ * Since there is only one init_mm in the entire system, keep it simple
+ * and size this cpu_bitmask to NR_CPUS.
+ */
+struct mm_struct init_mm = {
+ .mm_mt = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, init_mm.mmap_lock),
+ .pgd = swapper_pg_dir,
+ .mm_users = ATOMIC_INIT(2),
+ .mm_count = ATOMIC_INIT(1),
+ .write_protect_seq = SEQCNT_ZERO(init_mm.write_protect_seq),
+ MMAP_LOCK_INITIALIZER(init_mm)
+ .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
+ .arg_lock = __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),
+ .mmlist = LIST_HEAD_INIT(init_mm.mmlist),
+ .user_ns = &init_user_ns,
+ .cpu_bitmap = CPU_BITS_NONE,
+#ifdef CONFIG_IOMMU_SVA
+ .pasid = INVALID_IOASID,
+#endif
+ INIT_MM_CONTEXT(init_mm)
+};
+
+void setup_initial_init_mm(void *start_code, void *end_code,
+ void *end_data, void *brk)
+{
+ init_mm.start_code = (unsigned long)start_code;
+ init_mm.end_code = (unsigned long)end_code;
+ init_mm.end_data = (unsigned long)end_data;
+ init_mm.brk = (unsigned long)brk;
+}