From: Rajesh Shah <rajesh.shah@intel.com>
This patch reads and stores host bridge resources reported by ACPI BIOS for
x86_64 systems. This is needed since ACPI hotplug code now uses the PCI
core for resource management. This patch simply adds the boot parameter
(acpi=root_resources) to enable the functionality that is implemented in
arch/i386.
Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
(akpm: Andi hates the boot option)
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
arch/x86_64/kernel/setup.c | 3 +++
include/asm-x86_64/acpi.h | 6 ++++++
2 files changed, 9 insertions(+)
diff -puN arch/x86_64/kernel/setup.c~x86_64-collect-host-bridge-resources arch/x86_64/kernel/setup.c
--- 25/arch/x86_64/kernel/setup.c~x86_64-collect-host-bridge-resources Mon May 23 16:13:28 2005
+++ 25-akpm/arch/x86_64/kernel/setup.c Mon May 23 16:13:28 2005
@@ -315,6 +315,9 @@ static __init void parse_cmdline_early (
acpi_disable_pci();
else if (!memcmp(from, "acpi=noirq", 10))
acpi_noirq_set();
+ /* Use ACPI to read host bridge resources */
+ else if (!memcmp(from, "acpi=root_resources", 19))
+ acpi_set_read_root_resources();
else if (!memcmp(from, "acpi_sci=edge", 13))
acpi_sci_flags.trigger = 1;
diff -puN include/asm-x86_64/acpi.h~x86_64-collect-host-bridge-resources include/asm-x86_64/acpi.h
--- 25/include/asm-x86_64/acpi.h~x86_64-collect-host-bridge-resources Mon May 23 16:13:28 2005
+++ 25-akpm/include/asm-x86_64/acpi.h Mon May 23 16:13:28 2005
@@ -139,10 +139,16 @@ static inline void acpi_disable_pci(void
acpi_noirq_set();
}
extern int acpi_irq_balance_set(char *str);
+extern int acpi_read_root_resources;
+static inline void acpi_set_read_root_resources(void)
+{
+ acpi_read_root_resources = 1;
+}
#else
static inline void acpi_noirq_set(void) { }
static inline void acpi_disable_pci(void) { }
static inline int acpi_irq_balance_set(char *str) { return 0; }
+static inline void acpi_set_read_root_resources(void) { }
#endif
#ifdef CONFIG_ACPI_SLEEP
_