1 files changed, 232 insertions, 263 deletions

diff --git a/arch/avr32/kernel/setup.c b/arch/avr32/kernel/setup.c
index 53a1ff0..d0a35a1 100644
--- a/arch/avr32/kernel/setup.c
+++ b/arch/avr32/kernel/setup.c
@@ -32,13 +32,6 @@
 extern int root_mountflags;
 
 /*
- * Bootloader-provided information about physical memory
- */
-struct tag_mem_range *mem_phys;
-struct tag_mem_range *mem_reserved;
-struct tag_mem_range *mem_ramdisk;
-
-/*
  * Initialize loops_per_jiffy as 5000000 (500MIPS).
  * Better make it too large than too small...
  */
@@ -50,32 +43,153 @@ EXPORT_SYMBOL(boot_cpu_data);
 static char __initdata command_line[COMMAND_LINE_SIZE];
 
 /*
- * Should be more than enough, but if you have a _really_ complex
- * setup, you might need to increase the size of this...
+ * Standard memory resources
  */
-static struct tag_mem_range __initdata mem_range_cache[32];
-static unsigned mem_range_next_free;
+static struct resource __initdata kernel_data = {
+	.name	= "Kernel data",
+	.start	= 0,
+	.end	= 0,
+	.flags	= IORESOURCE_MEM,
+};
+static struct resource __initdata kernel_code = {
+	.name	= "Kernel code",
+	.start	= 0,
+	.end	= 0,
+	.flags	= IORESOURCE_MEM,
+	.sibling = &kernel_data,
+};
 
 /*
- * Standard memory resources
+ * Available system RAM and reserved regions as singly linked
+ * lists. These lists are traversed using the sibling pointer in
+ * struct resource and are kept sorted at all times.
  */
-static struct resource mem_res[] = {
-	{
-		.name	= "Kernel code",
-		.start	= 0,
-		.end	= 0,
-		.flags	= IORESOURCE_MEM
-	},
-	{
-		.name	= "Kernel data",
-		.start	= 0,
-		.end	= 0,
-		.flags	= IORESOURCE_MEM,
-	},
-};
+static struct resource *__initdata system_ram;
+static struct resource *__initdata reserved = &kernel_code;
+
+/*
+ * We need to allocate these before the bootmem allocator is up and
+ * running, so we need this "cache". 32 entries are probably enough
+ * for all but the most insanely complex systems.
+ */
+static struct resource __initdata res_cache[32];
+static unsigned int __initdata res_cache_next_free;
+
+static void __init resource_init(void)
+{
+	struct resource *mem, *res;
+	struct resource *new;
+
+	kernel_code.start = __pa(init_mm.start_code);
+
+	for (mem = system_ram; mem; mem = mem->sibling) {
+		new = alloc_bootmem_low(sizeof(struct resource));
+		memcpy(new, mem, sizeof(struct resource));
+
+		new->sibling = NULL;
+		if (request_resource(&iomem_resource, new))
+			printk(KERN_WARNING "Bad RAM resource %08x-%08x\n",
+			       mem->start, mem->end);
+	}
+
+	for (res = reserved; res; res = res->sibling) {
+		new = alloc_bootmem_low(sizeof(struct resource));
+		memcpy(new, res, sizeof(struct resource));
+
+		new->sibling = NULL;
+		if (insert_resource(&iomem_resource, new))
+			printk(KERN_WARNING
+			       "Bad reserved resource %s (%08x-%08x)\n",
+			       res->name, res->start, res->end);
+	}
+}
+
+static void __init
+add_physical_memory(resource_size_t start, resource_size_t end)
+{
+	struct resource *new, *next, **pprev;
+
+	for (pprev = &system_ram, next = system_ram; next;
+	     pprev = &next->sibling, next = next->sibling) {
+		if (end < next->start)
+			break;
+		if (start <= next->end) {
+			printk(KERN_WARNING
+			       "Warning: Physical memory map is broken\n");
+			printk(KERN_WARNING
+			       "Warning: %08x-%08x overlaps %08x-%08x\n",
+			       start, end, next->start, next->end);
+			return;
+		}
+	}
+
+	if (res_cache_next_free >= ARRAY_SIZE(res_cache)) {
+		printk(KERN_WARNING
+		       "Warning: Failed to add physical memory %08x-%08x\n",
+		       start, end);
+		return;
+	}
+
+	new = &res_cache[res_cache_next_free++];
+	new->start = start;
+	new->end = end;
+	new->name = "System RAM";
+	new->flags = IORESOURCE_MEM;
+
+	*pprev = new;
+}
+
+static int __init
+add_reserved_region(resource_size_t start, resource_size_t end,
+		    const char *name)
+{
+	struct resource *new, *next, **pprev;
 
-#define kernel_code	mem_res[0]
-#define kernel_data	mem_res[1]
+	if (end < start)
+		return -EINVAL;
+
+	if (res_cache_next_free >= ARRAY_SIZE(res_cache))
+		return -ENOMEM;
+
+	for (pprev = &reserved, next = reserved; next;
+	     pprev = &next->sibling, next = next->sibling) {
+		if (end < next->start)
+			break;
+		if (start <= next->end)
+			return -EBUSY;
+	}
+
+	new = &res_cache[res_cache_next_free++];
+	new->start = start;
+	new->end = end;
+	new->name = name;
+	new->flags = IORESOURCE_MEM;
+
+	*pprev = new;
+
+	return 0;
+}
+
+static unsigned long __init
+find_free_region(const struct resource *mem, resource_size_t size,
+		 resource_size_t align)
+{
+	struct resource *res;
+	unsigned long target;
+
+	target = ALIGN(mem->start, align);
+	for (res = reserved; res; res = res->sibling) {
+		if ((target + size) <= res->start)
+			break;
+		if (target <= res->end)
+			target = ALIGN(res->end + 1, align);
+	}
+
+	if ((target + size) > (mem->end + 1))
+		return mem->end + 1;
+
+	return target;
+}
 
 /*
  * Early framebuffer allocation. Works as follows:
@@ -112,42 +226,6 @@ static int __init early_parse_fbmem(char *p)
 }
 early_param("fbmem", early_parse_fbmem);
 
-static inline void __init resource_init(void)
-{
-	struct tag_mem_range *region;
-
-	kernel_code.start = __pa(init_mm.start_code);
-	kernel_code.end = __pa(init_mm.end_code - 1);
-	kernel_data.start = __pa(init_mm.end_code);
-	kernel_data.end = __pa(init_mm.brk - 1);
-
-	for (region = mem_phys; region; region = region->next) {
-		struct resource *res;
-		unsigned long phys_start, phys_end;
-
-		if (region->size == 0)
-			continue;
-
-		phys_start = region->addr;
-		phys_end = phys_start + region->size - 1;
-
-		res = alloc_bootmem_low(sizeof(*res));
-		res->name = "System RAM";
-		res->start = phys_start;
-		res->end = phys_end;
-		res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
-
-		request_resource (&iomem_resource, res);
-
-		if (kernel_code.start >= res->start &&
-		    kernel_code.end <= res->end)
-			request_resource (res, &kernel_code);
-		if (kernel_data.start >= res->start &&
-		    kernel_data.end <= res->end)
-			request_resource (res, &kernel_data);
-	}
-}
-
 static int __init parse_tag_core(struct tag *tag)
 {
 	if (tag->hdr.size > 2) {
@@ -159,11 +237,9 @@ static int __init parse_tag_core(struct tag *tag)
 }
 __tagtable(ATAG_CORE, parse_tag_core);
 
-static int __init parse_tag_mem_range(struct tag *tag,
-				      struct tag_mem_range **root)
+static int __init parse_tag_mem(struct tag *tag)
 {
-	struct tag_mem_range *cur, **pprev;
-	struct tag_mem_range *new;
+	unsigned long start, end;
 
 	/*
 	 * Ignore zero-sized entries. If we're running standalone, the
@@ -173,34 +249,53 @@ static int __init parse_tag_mem_range(struct tag *tag,
 	if (tag->u.mem_range.size == 0)
 		return 0;
 
-	/*
-	 * Copy the data so the bootmem init code doesn't need to care
-	 * about it.
-	 */
-	if (mem_range_next_free >= ARRAY_SIZE(mem_range_cache))
-		panic("Physical memory map too complex!\n");
+	start = tag->u.mem_range.addr;
+	end = tag->u.mem_range.addr + tag->u.mem_range.size - 1;
 
-	new = &mem_range_cache[mem_range_next_free++];
-	*new = tag->u.mem_range;
+	add_physical_memory(start, end);
+	return 0;
+}
+__tagtable(ATAG_MEM, parse_tag_mem);
 
-	pprev = root;
-	cur = *root;
-	while (cur) {
-		pprev = &cur->next;
-		cur = cur->next;
+static int __init parse_tag_rdimg(struct tag *tag)
+{
+#ifdef CONFIG_INITRD
+	struct tag_mem_range *mem = &tag->u.mem_range;
+	int ret;
+
+	if (initrd_start) {
+		printk(KERN_WARNING
+		       "Warning: Only the first initrd image will be used\n");
+		return 0;
 	}
 
-	*pprev = new;
-	new->next = NULL;
+	ret = add_reserved_region(mem->start, mem->start + mem->size - 1,
+				  "initrd");
+	if (ret) {
+		printk(KERN_WARNING
+		       "Warning: Failed to reserve initrd memory\n");
+		return ret;
+	}
+
+	initrd_start = (unsigned long)__va(mem->addr);
+	initrd_end = initrd_start + mem->size;
+#else
+	printk(KERN_WARNING "RAM disk image present, but "
+	       "no initrd support in kernel, ignoring\n");
+#endif
 
 	return 0;
 }
+__tagtable(ATAG_RDIMG, parse_tag_rdimg);
 
-static int __init parse_tag_mem(struct tag *tag)
+static int __init parse_tag_rsvd_mem(struct tag *tag)
 {
-	return parse_tag_mem_range(tag, &mem_phys);
+	struct tag_mem_range *mem = &tag->u.mem_range;
+
+	return add_reserved_region(mem->addr, mem->addr + mem->size - 1,
+				   "Reserved");
 }
-__tagtable(ATAG_MEM, parse_tag_mem);
+__tagtable(ATAG_RSVD_MEM, parse_tag_rsvd_mem);
 
 static int __init parse_tag_cmdline(struct tag *tag)
 {
@@ -209,12 +304,6 @@ static int __init parse_tag_cmdline(struct tag *tag)
 }
 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 
-static int __init parse_tag_rdimg(struct tag *tag)
-{
-	return parse_tag_mem_range(tag, &mem_ramdisk);
-}
-__tagtable(ATAG_RDIMG, parse_tag_rdimg);
-
 static int __init parse_tag_clock(struct tag *tag)
 {
 	/*
@@ -225,12 +314,6 @@ static int __init parse_tag_clock(struct tag *tag)
 }
 __tagtable(ATAG_CLOCK, parse_tag_clock);
 
-static int __init parse_tag_rsvd_mem(struct tag *tag)
-{
-	return parse_tag_mem_range(tag, &mem_reserved);
-}
-__tagtable(ATAG_RSVD_MEM, parse_tag_rsvd_mem);
-
 /*
  * Scan the tag table for this tag, and call its parse function. The
  * tag table is built by the linker from all the __tagtable
@@ -262,66 +345,16 @@ static void __init parse_tags(struct tag *t)
 			       t->hdr.tag);
 }
 
-static void __init print_memory_map(const char *what,
-				    struct tag_mem_range *mem)
-{
-	printk ("%s:\n", what);
-	for (; mem; mem = mem->next) {
-		printk ("  %08lx - %08lx\n",
-			(unsigned long)mem->addr,
-			(unsigned long)(mem->addr + mem->size));
-	}
-}
-
-#define MAX_LOWMEM	HIGHMEM_START
-#define MAX_LOWMEM_PFN	PFN_DOWN(MAX_LOWMEM)
-
-/*
- * Sort a list of memory regions in-place by ascending address.
- *
- * We're using bubble sort because we only have singly linked lists
- * with few elements.
- */
-static void __init sort_mem_list(struct tag_mem_range **pmem)
-{
-	int done;
-	struct tag_mem_range **a, **b;
-
-	if (!*pmem)
-		return;
-
-	do {
-		done = 1;
-		a = pmem, b = &(*pmem)->next;
-		while (*b) {
-			if ((*a)->addr > (*b)->addr) {
-				struct tag_mem_range *tmp;
-				tmp = (*b)->next;
-				(*b)->next = *a;
-				*a = *b;
-				*b = tmp;
-				done = 0;
-			}
-			a = &(*a)->next;
-			b = &(*a)->next;
-		}
-	} while (!done);
-}
-
 /*
  * Find a free memory region large enough for storing the
  * bootmem bitmap.
  */
 static unsigned long __init
-find_bootmap_pfn(const struct tag_mem_range *mem)
+find_bootmap_pfn(const struct resource *mem)
 {
 	unsigned long bootmap_pages, bootmap_len;
-	unsigned long node_pages = PFN_UP(mem->size);
-	unsigned long bootmap_addr = mem->addr;
-	struct tag_mem_range *reserved = mem_reserved;
-	struct tag_mem_range *ramdisk = mem_ramdisk;
-	unsigned long kern_start = __pa(_stext);
-	unsigned long kern_end = __pa(_end);
+	unsigned long node_pages = PFN_UP(mem->end - mem->start + 1);
+	unsigned long bootmap_start;
 
 	bootmap_pages = bootmem_bootmap_pages(node_pages);
 	bootmap_len = bootmap_pages << PAGE_SHIFT;
@@ -331,87 +364,43 @@ find_bootmap_pfn(const struct tag_mem_range *mem)
 	 * storing the bootmem bitmap. We can take advantage of the
 	 * fact that all lists have been sorted.
 	 *
-	 * We have to check explicitly reserved regions as well as the
-	 * kernel image and any RAMDISK images...
-	 *
-	 * Oh, and we have to make sure we don't overwrite the taglist
-	 * since we're going to use it until the bootmem allocator is
-	 * fully up and running.
+	 * We have to check that we don't collide with any reserved
+	 * regions, which includes the kernel image and any RAMDISK
+	 * images.
 	 */
-	while (1) {
-		if ((bootmap_addr < kern_end) &&
-		    ((bootmap_addr + bootmap_len) > kern_start))
-			bootmap_addr = kern_end;
-
-		while (reserved &&
-		       (bootmap_addr >= (reserved->addr + reserved->size)))
-			reserved = reserved->next;
-
-		if (reserved &&
-		    ((bootmap_addr + bootmap_len) >= reserved->addr)) {
-			bootmap_addr = reserved->addr + reserved->size;
-			continue;
-		}
-
-		while (ramdisk &&
-		       (bootmap_addr >= (ramdisk->addr + ramdisk->size)))
-			ramdisk = ramdisk->next;
-
-		if (!ramdisk ||
-		    ((bootmap_addr + bootmap_len) < ramdisk->addr))
-			break;
-
-		bootmap_addr = ramdisk->addr + ramdisk->size;
-	}
-
-	if ((PFN_UP(bootmap_addr) + bootmap_len) >= (mem->addr + mem->size))
-		return ~0UL;
+	bootmap_start = find_free_region(mem, bootmap_len, PAGE_SIZE);
 
-	return PFN_UP(bootmap_addr);
+	return bootmap_start >> PAGE_SHIFT;
 }
 
+#define MAX_LOWMEM	HIGHMEM_START
+#define MAX_LOWMEM_PFN	PFN_DOWN(MAX_LOWMEM)
+
 static void __init setup_bootmem(void)
 {
 	unsigned bootmap_size;
 	unsigned long first_pfn, bootmap_pfn, pages;
 	unsigned long max_pfn, max_low_pfn;
-	unsigned long kern_start = __pa(_stext);
-	unsigned long kern_end = __pa(_end);
 	unsigned node = 0;
-	struct tag_mem_range *bank, *res;
+	struct resource *res;
 
-	sort_mem_list(&mem_phys);
-	sort_mem_list(&mem_reserved);
-
-	print_memory_map("Physical memory", mem_phys);
-	print_memory_map("Reserved memory", mem_reserved);
+	printk(KERN_INFO "Physical memory:\n");
+	for (res = system_ram; res; res = res->sibling)
+		printk("  %08x-%08x\n", res->start, res->end);
+	printk(KERN_INFO "Reserved memory:\n");
+	for (res = reserved; res; res = res->sibling)
+		printk("  %08x-%08x: %s\n",
+		       res->start, res->end, res->name);
 
 	nodes_clear(node_online_map);
 
-	if (mem_ramdisk) {
-#ifdef CONFIG_BLK_DEV_INITRD
-		initrd_start = (unsigned long)__va(mem_ramdisk->addr);
-		initrd_end = initrd_start + mem_ramdisk->size;
-
-		print_memory_map("RAMDISK images", mem_ramdisk);
-		if (mem_ramdisk->next)
-			printk(KERN_WARNING
-			       "Warning: Only the first RAMDISK image "
-			       "will be used\n");
-		sort_mem_list(&mem_ramdisk);
-#else
-		printk(KERN_WARNING "RAM disk image present, but "
-		       "no initrd support in kernel!\n");
-#endif
-	}
-
-	if (mem_phys->next)
+	if (system_ram->sibling)
 		printk(KERN_WARNING "Only using first memory bank\n");
 
-	for (bank = mem_phys; bank; bank = NULL) {
-		first_pfn = PFN_UP(bank->addr);
-		max_low_pfn = max_pfn = PFN_DOWN(bank->addr + bank->size);
-		bootmap_pfn = find_bootmap_pfn(bank);
+	for (res = system_ram; res; res = NULL) {
+		first_pfn = PFN_UP(res->start);
+		max_low_pfn = max_pfn = PFN_DOWN(res->end + 1);
+		bootmap_pfn = find_bootmap_pfn(res);
 		if (bootmap_pfn > max_pfn)
 			panic("No space for bootmem bitmap!\n");
 
@@ -435,10 +424,6 @@ static void __init setup_bootmem(void)
 		bootmap_size = init_bootmem_node(NODE_DATA(node), bootmap_pfn,
 						 first_pfn, max_low_pfn);
 
-		printk("Node %u: bdata = %p, bdata->node_bootmem_map = %p\n",
-		       node, NODE_DATA(node)->bdata,
-		       NODE_DATA(node)->bdata->node_bootmem_map);
-
 		/*
 		 * Register fully available RAM pages with the bootmem
 		 * allocator.
@@ -447,51 +432,26 @@ static void __init setup_bootmem(void)
 		free_bootmem_node (NODE_DATA(node), PFN_PHYS(first_pfn),
 				   PFN_PHYS(pages));
 
-		/*
-		 * Reserve space for the kernel image (if present in
-		 * this node)...
-		 */
-		if ((kern_start >= PFN_PHYS(first_pfn)) &&
-		    (kern_start < PFN_PHYS(max_pfn))) {
-			printk("Node %u: Kernel image %08lx - %08lx\n",
-			       node, kern_start, kern_end);
-			reserve_bootmem_node(NODE_DATA(node), kern_start,
-					     kern_end - kern_start);
-		}
-
-		/* ...the bootmem bitmap... */
+		/* Reserve space for the bootmem bitmap... */
 		reserve_bootmem_node(NODE_DATA(node),
 				     PFN_PHYS(bootmap_pfn),
 				     bootmap_size);
 
-		/* ...any RAMDISK images... */
-		for (res = mem_ramdisk; res; res = res->next) {
-			if (res->addr > PFN_PHYS(max_pfn))
-				break;
-
-			if (res->addr >= PFN_PHYS(first_pfn)) {
-				printk("Node %u: RAMDISK %08lx - %08lx\n",
-				       node,
-				       (unsigned long)res->addr,
-				       (unsigned long)(res->addr + res->size));
-				reserve_bootmem_node(NODE_DATA(node),
-						     res->addr, res->size);
-			}
-		}
-
 		/* ...and any other reserved regions. */
-		for (res = mem_reserved; res; res = res->next) {
-			if (res->addr > PFN_PHYS(max_pfn))
+		for (res = reserved; res; res = res->sibling) {
+			if (res->start > PFN_PHYS(max_pfn))
 				break;
 
-			if (res->addr >= PFN_PHYS(first_pfn)) {
-				printk("Node %u: Reserved %08lx - %08lx\n",
-				       node,
-				       (unsigned long)res->addr,
-				       (unsigned long)(res->addr + res->size));
-				reserve_bootmem_node(NODE_DATA(node),
-						     res->addr, res->size);
-			}
+			/*
+			 * resource_init will complain about partial
+			 * overlaps, so we'll just ignore such
+			 * resources for now.
+			 */
+			if (res->start >= PFN_PHYS(first_pfn)
+			    && res->end < PFN_PHYS(max_pfn))
+				reserve_bootmem_node(
+					NODE_DATA(node), res->start,
+					res->end - res->start + 1);
 		}
 
 		node_set_online(node);
@@ -502,6 +462,20 @@ void __init setup_arch (char **cmdline_p)
 {
 	struct clk *cpu_clk;
 
+	init_mm.start_code = (unsigned long)_text;
+	init_mm.end_code = (unsigned long)_etext;
+	init_mm.end_data = (unsigned long)_edata;
+	init_mm.brk = (unsigned long)_end;
+
+	/*
+	 * Include .init section to make allocations easier. It will
+	 * be removed before the resource is actually requested.
+	 */
+	kernel_code.start = __pa(__init_begin);
+	kernel_code.end = __pa(init_mm.end_code - 1);
+	kernel_data.start = __pa(init_mm.end_code);
+	kernel_data.end = __pa(init_mm.brk - 1);
+
 	parse_tags(bootloader_tags);
 
 	setup_processor();
@@ -527,11 +501,6 @@ void __init setup_arch (char **cmdline_p)
 		       ((cpu_hz + 500) / 1000) % 1000);
 	}
 
-	init_mm.start_code = (unsigned long) &_text;
-	init_mm.end_code = (unsigned long) &_etext;
-	init_mm.end_data = (unsigned long) &_edata;
-	init_mm.brk = (unsigned long) &_end;
-
 	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 	*cmdline_p = command_line;
 	parse_early_param();