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

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>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index 8a6c5b412348..1aaea6ab8c46 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -30,6 +30,8 @@
 #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>
@@ -646,6 +648,8 @@ static int __init acpi_parse_sbf(unsigned long phys_addr, unsigned long size)
 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;
@@ -661,12 +665,26 @@ static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
                        "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;
@@ -674,9 +692,17 @@ static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
                 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