1 files changed, 149 insertions, 30 deletions

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index a53f8ec37aac..4c774d5d5087 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -8,7 +8,7 @@
  * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03  Ralf Baechle
  * Copyright (C) 1996 Stoned Elipot
  * Copyright (C) 1999 Silicon Graphics, Inc.
- * Copyright (C) 2000, 2001, 2002, 2007  Maciej W. Rozycki
+ * Copyright (C) 2000, 2001, 2002, 2007	 Maciej W. Rozycki
  */
 #include <linux/init.h>
 #include <linux/ioport.h>
@@ -22,6 +22,7 @@
 #include <linux/console.h>
 #include <linux/pfn.h>
 #include <linux/debugfs.h>
+#include <linux/kexec.h>
 
 #include <asm/addrspace.h>
 #include <asm/bootinfo.h>
@@ -79,7 +80,7 @@ static struct resource data_resource = { .name = "Kernel data", };
 void __init add_memory_region(phys_t start, phys_t size, long type)
 {
 	int x = boot_mem_map.nr_map;
-	struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
+	int i;
 
 	/* Sanity check */
 	if (start + size < start) {
@@ -88,15 +89,29 @@ void __init add_memory_region(phys_t start, phys_t size, long type)
 	}
 
 	/*
-	 * Try to merge with previous entry if any.  This is far less than
-	 * perfect but is sufficient for most real world cases.
+	 * Try to merge with existing entry, if any.
 	 */
-	if (x && prev->addr + prev->size == start && prev->type == type) {
-		prev->size += size;
+	for (i = 0; i < boot_mem_map.nr_map; i++) {
+		struct boot_mem_map_entry *entry = boot_mem_map.map + i;
+		unsigned long top;
+
+		if (entry->type != type)
+			continue;
+
+		if (start + size < entry->addr)
+			continue;			/* no overlap */
+
+		if (entry->addr + entry->size < start)
+			continue;			/* no overlap */
+
+		top = max(entry->addr + entry->size, start + size);
+		entry->addr = min(entry->addr, start);
+		entry->size = top - entry->addr;
+
 		return;
 	}
 
-	if (x == BOOT_MEM_MAP_MAX) {
+	if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
 		pr_err("Ooops! Too many entries in the memory map!\n");
 		return;
 	}
@@ -434,7 +449,7 @@ static void __init bootmem_init(void)
  * At this stage the bootmem allocator is ready to use.
  *
  * NOTE: historically plat_mem_setup did the entire platform initialization.
- *       This was rather impractical because it meant plat_mem_setup had to
+ *	 This was rather impractical because it meant plat_mem_setup had to
  * get away without any kind of memory allocator.  To keep old code from
  * breaking plat_setup was just renamed to plat_setup and a second platform
  * initialization hook for anything else was introduced.
@@ -454,7 +469,7 @@ static int __init early_parse_mem(char *p)
 	if (usermem == 0) {
 		boot_mem_map.nr_map = 0;
 		usermem = 1;
- 	}
+	}
 	start = 0;
 	size = memparse(p, &p);
 	if (*p == '@')
@@ -465,34 +480,75 @@ static int __init early_parse_mem(char *p)
 }
 early_param("mem", early_parse_mem);
 
-static void __init arch_mem_init(char **cmdline_p)
+#ifdef CONFIG_PROC_VMCORE
+unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
+static int __init early_parse_elfcorehdr(char *p)
 {
-	phys_t init_mem, init_end, init_size;
+	int i;
+
+	setup_elfcorehdr = memparse(p, &p);
+
+	for (i = 0; i < boot_mem_map.nr_map; i++) {
+		unsigned long start = boot_mem_map.map[i].addr;
+		unsigned long end = (boot_mem_map.map[i].addr +
+				     boot_mem_map.map[i].size);
+		if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
+			/*
+			 * Reserve from the elf core header to the end of
+			 * the memory segment, that should all be kdump
+			 * reserved memory.
+			 */
+			setup_elfcorehdr_size = end - setup_elfcorehdr;
+			break;
+		}
+	}
+	/*
+	 * If we don't find it in the memory map, then we shouldn't
+	 * have to worry about it, as the new kernel won't use it.
+	 */
+	return 0;
+}
+early_param("elfcorehdr", early_parse_elfcorehdr);
+#endif
+
+static void __init arch_mem_addpart(phys_t mem, phys_t end, int type)
+{
+	phys_t size;
+	int i;
+
+	size = end - mem;
+	if (!size)
+		return;
+
+	/* Make sure it is in the boot_mem_map */
+	for (i = 0; i < boot_mem_map.nr_map; i++) {
+		if (mem >= boot_mem_map.map[i].addr &&
+		    mem < (boot_mem_map.map[i].addr +
+			   boot_mem_map.map[i].size))
+			return;
+	}
+	add_memory_region(mem, size, type);
+}
 
+static void __init arch_mem_init(char **cmdline_p)
+{
 	extern void plat_mem_setup(void);
 
 	/* call board setup routine */
 	plat_mem_setup();
 
-	init_mem = PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT;
-	init_end = PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT;
-	init_size = init_end - init_mem;
-	if (init_size) {
-		/* Make sure it is in the boot_mem_map */
-		int i, found;
-		found = 0;
-		for (i = 0; i < boot_mem_map.nr_map; i++) {
-			if (init_mem >= boot_mem_map.map[i].addr &&
-			    init_mem < (boot_mem_map.map[i].addr +
-					boot_mem_map.map[i].size)) {
-				found = 1;
-				break;
-			}
-		}
-		if (!found)
-			add_memory_region(init_mem, init_size,
-					  BOOT_MEM_INIT_RAM);
-	}
+	/*
+	 * Make sure all kernel memory is in the maps.  The "UP" and
+	 * "DOWN" are opposite for initdata since if it crosses over
+	 * into another memory section you don't want that to be
+	 * freed when the initdata is freed.
+	 */
+	arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
+			 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
+			 BOOT_MEM_RAM);
+	arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
+			 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
+			 BOOT_MEM_INIT_RAM);
 
 	pr_info("Determined physical RAM map:\n");
 	print_memory_map();
@@ -522,12 +578,72 @@ static void __init arch_mem_init(char **cmdline_p)
 	}
 
 	bootmem_init();
+#ifdef CONFIG_PROC_VMCORE
+	if (setup_elfcorehdr && setup_elfcorehdr_size) {
+		printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
+		       setup_elfcorehdr, setup_elfcorehdr_size);
+		reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
+				BOOTMEM_DEFAULT);
+	}
+#endif
+#ifdef CONFIG_KEXEC
+	if (crashk_res.start != crashk_res.end)
+		reserve_bootmem(crashk_res.start,
+				crashk_res.end - crashk_res.start + 1,
+				BOOTMEM_DEFAULT);
+#endif
 	device_tree_init();
 	sparse_init();
 	plat_swiotlb_setup();
 	paging_init();
 }
 
+#ifdef CONFIG_KEXEC
+static inline unsigned long long get_total_mem(void)
+{
+	unsigned long long total;
+
+	total = max_pfn - min_low_pfn;
+	return total << PAGE_SHIFT;
+}
+
+static void __init mips_parse_crashkernel(void)
+{
+	unsigned long long total_mem;
+	unsigned long long crash_size, crash_base;
+	int ret;
+
+	total_mem = get_total_mem();
+	ret = parse_crashkernel(boot_command_line, total_mem,
+				&crash_size, &crash_base);
+	if (ret != 0 || crash_size <= 0)
+		return;
+
+	crashk_res.start = crash_base;
+	crashk_res.end	 = crash_base + crash_size - 1;
+}
+
+static void __init request_crashkernel(struct resource *res)
+{
+	int ret;
+
+	ret = request_resource(res, &crashk_res);
+	if (!ret)
+		pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
+			(unsigned long)((crashk_res.end -
+				crashk_res.start + 1) >> 20),
+			(unsigned long)(crashk_res.start  >> 20));
+}
+#else /* !defined(CONFIG_KEXEC)	 */
+static void __init mips_parse_crashkernel(void)
+{
+}
+
+static void __init request_crashkernel(struct resource *res)
+{
+}
+#endif /* !defined(CONFIG_KEXEC)  */
+
 static void __init resource_init(void)
 {
 	int i;
@@ -543,6 +659,8 @@ static void __init resource_init(void)
 	/*
 	 * Request address space for all standard RAM.
 	 */
+	mips_parse_crashkernel();
+
 	for (i = 0; i < boot_mem_map.nr_map; i++) {
 		struct resource *res;
 		unsigned long start, end;
@@ -579,6 +697,7 @@ static void __init resource_init(void)
 		 */
 		request_resource(res, &code_resource);
 		request_resource(res, &data_resource);
+		request_crashkernel(res);
 	}
 }