[PATCH] i386/x86_64: add HPET(s) into resource map

[adurbin@google.com]

Add HPET(s) into resource map. This will allow for the HPET(s) to be
visibile within /proc/iomem.

Signed-off-by: Aaron Durbin <adurbin@google.com>

---

diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index ee003bc..d3fafb2 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -29,6 +29,8 @@ #include <linux/efi.h>
 #include <linux/module.h>
 #include <linux/dmi.h>
 #include <linux/irq.h>
+#include <linux/bootmem.h>
+#include <linux/ioport.h>
 
 #include <asm/pgtable.h>
 #include <asm/io_apic.h>
@@ -579,6 +581,8 @@ #ifdef CONFIG_HPET_TIMER
 static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
 {
 	struct acpi_table_hpet *hpet_tbl;
+	struct resource *hpet_res;
+	resource_size_t res_start;
 
 	if (!phys || !size)
 		return -EINVAL;
@@ -594,12 +598,26 @@ static int __init acpi_parse_hpet(unsign
 		       "memory.\n");
 		return -1;
 	}
+
+#define HPET_RESOURCE_NAME_SIZE 9
+	hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
+	if (hpet_res) {
+		memset(hpet_res, 0, sizeof(*hpet_res));
+		hpet_res->name = (void *)&hpet_res[1];
+		hpet_res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+		snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, 
+			 "HPET %u", hpet_tbl->number);
+		hpet_res->end = (1 * 1024) - 1;
+	}
+
 #ifdef	CONFIG_X86_64
 	vxtime.hpet_address = hpet_tbl->addr.addrl |
 	    ((long)hpet_tbl->addr.addrh << 32);
 
 	printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 	       hpet_tbl->id, vxtime.hpet_address);
+
+	res_start = vxtime.hpet_address;
 #else				/* X86 */
 	{
 		extern unsigned long hpet_address;
@@ -607,9 +625,17 @@ #else				/* X86 */
 		hpet_address = hpet_tbl->addr.addrl;
 		printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 		       hpet_tbl->id, hpet_address);
+
+		res_start = hpet_address;
 	}
 #endif				/* X86 */
 
+	if (hpet_res) {
+		hpet_res->start = res_start;
+		hpet_res->end += res_start;
+		insert_resource(&iomem_resource, hpet_res);
+	}
+
 	return 0;
 }
 #else
-
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