[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/arch/m68k/mm/sun3mmu.c b/src/kernel/linux/v4.14/arch/m68k/mm/sun3mmu.c
new file mode 100644
index 0000000..4a99799
--- /dev/null
+++ b/src/kernel/linux/v4.14/arch/m68k/mm/sun3mmu.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/arch/m68k/mm/sun3mmu.c
+ *
+ * Implementations of mm routines specific to the sun3 MMU.
+ *
+ * Moved here 8/20/1999 Sam Creasey
+ *
+ */
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+
+#include <asm/setup.h>
+#include <linux/uaccess.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+
+extern void mmu_emu_init (unsigned long bootmem_end);
+
+const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
+
+extern unsigned long num_pages;
+
+/* For the sun3 we try to follow the i386 paging_init() more closely */
+/* start_mem and end_mem have PAGE_OFFSET added already */
+/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
+void __init paging_init(void)
+{
+ pgd_t * pg_dir;
+ pte_t * pg_table;
+ int i;
+ unsigned long address;
+ unsigned long next_pgtable;
+ unsigned long bootmem_end;
+ unsigned long zones_size[MAX_NR_ZONES] = { 0, };
+ unsigned long size;
+
+ empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
+
+ address = PAGE_OFFSET;
+ pg_dir = swapper_pg_dir;
+ memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
+ memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
+
+ size = num_pages * sizeof(pte_t);
+ size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
+
+ next_pgtable = (unsigned long)alloc_bootmem_pages(size);
+ bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
+
+ /* Map whole memory from PAGE_OFFSET (0x0E000000) */
+ pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
+
+ while (address < (unsigned long)high_memory) {
+ pg_table = (pte_t *) __pa (next_pgtable);
+ next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
+ pgd_val(*pg_dir) = (unsigned long) pg_table;
+ pg_dir++;
+
+ /* now change pg_table to kernel virtual addresses */
+ pg_table = (pte_t *) __va ((unsigned long) pg_table);
+ for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
+ pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
+ if (address >= (unsigned long)high_memory)
+ pte_val (pte) = 0;
+ set_pte (pg_table, pte);
+ address += PAGE_SIZE;
+ }
+ }
+
+ mmu_emu_init(bootmem_end);
+
+ current->mm = NULL;
+
+ /* memory sizing is a hack stolen from motorola.c.. hope it works for us */
+ zones_size[ZONE_DMA] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
+
+ /* I really wish I knew why the following change made things better... -- Sam */
+/* free_area_init(zones_size); */
+ free_area_init_node(0, zones_size,
+ (__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL);
+
+
+}
+
+