1 files changed, 97 insertions, 0 deletions
diff --git a/arch/m68k/mm/sun3mmu.c b/arch/m68k/mm/sun3mmu.c
new file mode 100644
index 000000000..dad494224
--- /dev/null
+++ b/arch/m68k/mm/sun3mmu.c
@@ -0,0 +1,97 @@
+// 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/memblock.h>
+
+#include <asm/setup.h>
+#include <linux/uaccess.h>
+#include <asm/page.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 max_zone_pfn[MAX_NR_ZONES] = { 0, };
+	unsigned long size;
+
+	empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+	if (!empty_zero_page)
+		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
+		      __func__, PAGE_SIZE, 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)memblock_alloc(size, PAGE_SIZE);
+	if (!next_pgtable)
+		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
+		      __func__, size, PAGE_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 */
+	max_zone_pfn[ZONE_DMA] = ((unsigned long)high_memory) >> PAGE_SHIFT;
+
+	/* I really wish I knew why the following change made things better...  -- Sam */
+	free_area_init(max_zone_pfn);
+
+
+}