Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 162 insertions, 0 deletions

diff --git a/kernel/arch/m32r/mm/discontig.c b/kernel/arch/m32r/mm/discontig.c
new file mode 100644
index 000000000..27196303c
--- /dev/null
+++ b/kernel/arch/m32r/mm/discontig.c
@@ -0,0 +1,162 @@
+/*
+ *  linux/arch/m32r/mm/discontig.c
+ *
+ *  Discontig memory support
+ *
+ *  Copyright (c) 2003  Hitoshi Yamamoto
+ */
+
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/mmzone.h>
+#include <linux/initrd.h>
+#include <linux/nodemask.h>
+#include <linux/module.h>
+#include <linux/pfn.h>
+
+#include <asm/setup.h>
+
+extern char _end[];
+
+struct pglist_data *node_data[MAX_NUMNODES];
+EXPORT_SYMBOL(node_data);
+
+pg_data_t m32r_node_data[MAX_NUMNODES];
+
+/* Memory profile */
+typedef struct {
+	unsigned long start_pfn;
+	unsigned long pages;
+	unsigned long holes;
+	unsigned long free_pfn;
+} mem_prof_t;
+static mem_prof_t mem_prof[MAX_NUMNODES];
+
+extern unsigned long memory_start;
+extern unsigned long memory_end;
+
+static void __init mem_prof_init(void)
+{
+	unsigned long start_pfn, holes, free_pfn;
+	const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
+	unsigned long ul;
+	mem_prof_t *mp;
+
+	/* Node#0 SDRAM */
+	mp = &mem_prof[0];
+	mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
+	mp->pages = PFN_DOWN(memory_end - memory_start);
+	mp->holes = 0;
+	mp->free_pfn = PFN_UP(__pa(_end));
+
+	/* Node#1 internal SRAM */
+	mp = &mem_prof[1];
+	start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
+	holes = 0;
+	if (start_pfn & (zone_alignment - 1)) {
+		ul = zone_alignment;
+		while (start_pfn >= ul)
+			ul += zone_alignment;
+
+		start_pfn = ul - zone_alignment;
+		holes = free_pfn - start_pfn;
+	}
+
+	mp->start_pfn = start_pfn;
+	mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
+	mp->holes = holes;
+	mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
+}
+
+unsigned long __init setup_memory(void)
+{
+	unsigned long bootmap_size;
+	unsigned long min_pfn;
+	int nid;
+	mem_prof_t *mp;
+
+	max_low_pfn = 0;
+	min_low_pfn = -1;
+
+	mem_prof_init();
+
+	for_each_online_node(nid) {
+		mp = &mem_prof[nid];
+		NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
+		NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
+		min_pfn = mp->start_pfn;
+		max_pfn = mp->start_pfn + mp->pages;
+		bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
+			mp->start_pfn, max_pfn);
+
+		free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
+			PFN_PHYS(mp->pages));
+
+		reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
+			PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size,
+			BOOTMEM_DEFAULT);
+
+		if (max_low_pfn < max_pfn)
+			max_low_pfn = max_pfn;
+
+		if (min_low_pfn > min_pfn)
+			min_low_pfn = min_pfn;
+	}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (LOADER_TYPE && INITRD_START) {
+		if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
+			reserve_bootmem_node(NODE_DATA(0), INITRD_START,
+				INITRD_SIZE, BOOTMEM_DEFAULT);
+			initrd_start = INITRD_START + PAGE_OFFSET;
+			initrd_end = initrd_start + INITRD_SIZE;
+			printk("initrd:start[%08lx],size[%08lx]\n",
+				initrd_start, INITRD_SIZE);
+		} else {
+			printk("initrd extends beyond end of memory "
+				"(0x%08lx > 0x%08llx)\ndisabling initrd\n",
+				INITRD_START + INITRD_SIZE,
+			        (unsigned long long)PFN_PHYS(max_low_pfn));
+
+			initrd_start = 0;
+		}
+	}
+#endif	/* CONFIG_BLK_DEV_INITRD */
+
+	return max_low_pfn;
+}
+
+#define START_PFN(nid)		(NODE_DATA(nid)->bdata->node_min_pfn)
+#define MAX_LOW_PFN(nid)	(NODE_DATA(nid)->bdata->node_low_pfn)
+
+void __init zone_sizes_init(void)
+{
+	unsigned long zones_size[MAX_NR_ZONES], zholes_size[MAX_NR_ZONES];
+	unsigned long low, start_pfn;
+	int nid, i;
+	mem_prof_t *mp;
+
+	for_each_online_node(nid) {
+		mp = &mem_prof[nid];
+		for (i = 0 ; i < MAX_NR_ZONES ; i++) {
+			zones_size[i] = 0;
+			zholes_size[i] = 0;
+		}
+		start_pfn = START_PFN(nid);
+		low = MAX_LOW_PFN(nid);
+		zones_size[ZONE_DMA] = low - start_pfn;
+		zholes_size[ZONE_DMA] = mp->holes;
+
+		node_set_state(nid, N_NORMAL_MEMORY);
+		free_area_init_node(nid, zones_size, start_pfn, zholes_size);
+	}
+
+	/*
+	 * For test
+	 *  Use all area of internal RAM.
+	 *  see __alloc_pages()
+	 */
+	NODE_DATA(1)->node_zones->watermark[WMARK_MIN] = 0;
+	NODE_DATA(1)->node_zones->watermark[WMARK_LOW] = 0;
+	NODE_DATA(1)->node_zones->watermark[WMARK_HIGH] = 0;
+}