[PATCH][2.6-test4][2/6]Support for HPET based timer

[PATCH][2.6-test4][2/6]Support for HPET based timer

[Pallipadi, Venkatesh]

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2/6 - hpet2.patch - acpi boot time parsing changes to look for HPET



diff -purN linux-2.6.0-test4/arch/i386/kernel/acpi/boot.c linux-2.6.0-test4-hpet/arch/i386/kernel/acpi/boot.c
--- linux-2.6.0-test4/arch/i386/kernel/acpi/boot.c	2003-08-22 16:59:02.000000000 -0700
+++ linux-2.6.0-test4-hpet/arch/i386/kernel/acpi/boot.c	2003-08-28 12:18:15.000000000 -0700
@@ -269,6 +269,27 @@ acpi_scan_rsdp (
 	return 0;
 }
 
+#ifdef CONFIG_HPET_TIMER
+extern unsigned long hpet_address;
+
+static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
+{
+	struct acpi_table_hpet *hpet_tbl;
+
+	hpet_tbl = __va(phys);
+
+	if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
+		printk(KERN_WARNING PREFIX "HPET timers must be located in "
+		       "memory.\n");
+		return -1;
+	}
+
+	hpet_address = hpet_tbl->addr.addrl;
+	printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n", hpet_tbl->id, 
+	       hpet_address);
+	return 0;
+}
+#endif
 
 unsigned long __init
 acpi_find_rsdp (void)
@@ -458,6 +479,9 @@ acpi_boot_init (void)
 		clustered_apic_check();
 	}
 #endif
+#ifdef CONFIG_HPET_TIMER
+	acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
+#endif
 
 	return 0;
 }



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