[RFC] /proc/efi_memmap

kexec folks asked whether I could export the EFI memory map in /proc
for use by their user level tools.

Questions:
0) Is this information already available some place I missed?
1) Is /proc/efi_memmap a good name?
2) I used mm/slab.c as my model for using seq_file ... does this look right?

-Tony

Patch against the "test" branch of my GIT tree.

---

diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -22,6 +22,8 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <linux/types.h>
 #include <linux/time.h>
 #include <linux/efi.h>
@@ -923,3 +925,89 @@ efi_memmap_init(unsigned long *s, unsign
 	*s = (u64)kern_memmap;
 	*e = (u64)++k;
 }
+
+#ifdef CONFIG_PROC_FS
+
+static void *s_start(struct seq_file *m, loff_t *pos)
+{
+	loff_t n = *pos;
+	void *efi_map_start, *efi_map_end, *p;
+	u64	efi_desc_size;
+
+	if (!n)
+		seq_puts(m, "type            start              end attributes\n");
+
+	p = efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	while (n--) {
+		p += efi_desc_size;
+		if (p >= efi_map_end)
+			return NULL;
+	}
+
+	return p;
+}
+
+static void *s_next(struct seq_file *m, void *p, loff_t *pos)
+{
+	void *efi_map_start, *efi_map_end;
+	u64	efi_desc_size;
+
+	++*pos;
+
+	efi_map_start = __va(ia64_boot_param->efi_memmap);
+	efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
+	efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+	return (p + efi_desc_size >= efi_map_end) ? NULL : p + efi_desc_size;
+}
+
+static void s_stop(struct seq_file *m, void *p)
+{
+}
+
+static int s_show(struct seq_file *m, void *p)
+{
+	efi_memory_desc_t *md = p;
+
+	seq_printf(m, "%4d %16.16lx %16.16lx %lx\n", md->type, md->phys_addr,
+		efi_md_end(md), md->attribute);
+
+	return 0;
+}
+
+static struct seq_operations efimeminfo_op = {
+	.start	= s_start,
+	.next	= s_next,
+	.stop	= s_stop,
+	.show	= s_show,
+};
+
+static int efimeminfo_open(struct inode *inode, struct file *file)
+{
+        return seq_open(file, &efimeminfo_op);
+}
+
+static struct file_operations proc_efimeminfo_operations = {
+	.open		= efimeminfo_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+
+static int __init
+efi_procmem(void)
+{
+	struct proc_dir_entry *entry;
+
+	entry = create_proc_entry("efi_memmap", S_IRUGO, NULL);
+	if (entry)
+		entry->proc_fops = &proc_efimeminfo_operations;
+
+	return 0;
+}
+late_initcall(efi_procmem);
+
+#endif
-
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