Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 153 insertions, 0 deletions

diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c
new file mode 100644
index 000000000..38e2b272c
--- /dev/null
+++ b/arch/m68k/mm/init.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  linux/arch/m68k/mm/init.c
+ *
+ *  Copyright (C) 1995  Hamish Macdonald
+ *
+ *  Contains common initialization routines, specific init code moved
+ *  to motorola.c and sun3mmu.c
+ */
+
+#include <linux/module.h>
+#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 <linux/gfp.h>
+
+#include <asm/setup.h>
+#include <linux/uaccess.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/traps.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+#ifdef CONFIG_ATARI
+#include <asm/atari_stram.h>
+#endif
+#include <asm/sections.h>
+#include <asm/tlb.h>
+
+/*
+ * ZERO_PAGE is a special page that is used for zero-initialized
+ * data and COW.
+ */
+void *empty_zero_page;
+EXPORT_SYMBOL(empty_zero_page);
+
+#if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
+extern void init_pointer_table(unsigned long ptable);
+extern pmd_t *zero_pgtable;
+#endif
+
+#ifdef CONFIG_MMU
+
+pg_data_t pg_data_map[MAX_NUMNODES];
+EXPORT_SYMBOL(pg_data_map);
+
+int m68k_virt_to_node_shift;
+
+#ifndef CONFIG_SINGLE_MEMORY_CHUNK
+pg_data_t *pg_data_table[65];
+EXPORT_SYMBOL(pg_data_table);
+#endif
+
+void __init m68k_setup_node(int node)
+{
+#ifndef CONFIG_SINGLE_MEMORY_CHUNK
+	struct m68k_mem_info *info = m68k_memory + node;
+	int i, end;
+
+	i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
+	end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
+	for (; i <= end; i++) {
+		if (pg_data_table[i])
+			pr_warn("overlap at %u for chunk %u\n", i, node);
+		pg_data_table[i] = pg_data_map + node;
+	}
+#endif
+	node_set_online(node);
+}
+
+#else /* CONFIG_MMU */
+
+/*
+ * paging_init() continues the virtual memory environment setup which
+ * was begun by the code in arch/head.S.
+ * The parameters are pointers to where to stick the starting and ending
+ * addresses of available kernel virtual memory.
+ */
+void __init paging_init(void)
+{
+	/*
+	 * Make sure start_mem is page aligned, otherwise bootmem and
+	 * page_alloc get different views of the world.
+	 */
+	unsigned long end_mem = memory_end & PAGE_MASK;
+	unsigned long zones_size[MAX_NR_ZONES] = { 0, };
+
+	high_memory = (void *) end_mem;
+
+	empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
+
+	/*
+	 * Set up SFC/DFC registers (user data space).
+	 */
+	set_fs (USER_DS);
+
+	zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
+	free_area_init(zones_size);
+}
+
+#endif /* CONFIG_MMU */
+
+void free_initmem(void)
+{
+#ifndef CONFIG_MMU_SUN3
+	free_initmem_default(-1);
+#endif /* CONFIG_MMU_SUN3 */
+}
+
+#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
+#define VECTORS	&vectors[0]
+#else
+#define VECTORS	_ramvec
+#endif
+
+static inline void init_pointer_tables(void)
+{
+#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
+	int i;
+
+	/* insert pointer tables allocated so far into the tablelist */
+	init_pointer_table((unsigned long)kernel_pg_dir);
+	for (i = 0; i < PTRS_PER_PGD; i++) {
+		if (pgd_present(kernel_pg_dir[i]))
+			init_pointer_table(__pgd_page(kernel_pg_dir[i]));
+	}
+
+	/* insert also pointer table that we used to unmap the zero page */
+	if (zero_pgtable)
+		init_pointer_table((unsigned long)zero_pgtable);
+#endif
+}
+
+void __init mem_init(void)
+{
+	/* this will put all memory onto the freelists */
+	free_all_bootmem();
+	init_pointer_tables();
+	mem_init_print_info(NULL);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
+}
+#endif