linux-kernel - [PATCH 5/9] x86: make use of platform flags in setup code

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Date:	Thu, 25 Jun 2009 17:14:44 -0700
From:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: [PATCH 5/9] x86: make use of platform flags in setup code

>From 7b51bf39f69dc9b2adc84113d76033facb9557bd Mon Sep 17 00:00:00 2001
From: Jacob Pan <jacob.jun.pan@...el.com>
Date: Thu, 11 Jun 2009 20:48:54 -0700
Subject: [PATCH] x86: make use of platform flags in setup code

This patch uses platform feature flags to selectively perform platform
initialization. e.g. avoid reserve resources if certain feature is not
found.

Signed-off-by: Jacob Pan <jacob.jun.pan@...el.com>
---
 arch/x86/kernel/head32.c |    6 +++++-
 arch/x86/kernel/setup.c  |   12 ++++++++----
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c
index 3f8579f..0989f5e 100644
--- a/arch/x86/kernel/head32.c
+++ b/arch/x86/kernel/head32.c
@@ -13,6 +13,8 @@
 #include <asm/e820.h>
 #include <asm/bios_ebda.h>
 #include <asm/trampoline.h>
+#include <asm/bootparam.h>
+#include <asm/platform_feature.h>
 
 void __init i386_start_kernel(void)
 {
@@ -29,7 +31,9 @@ void __init i386_start_kernel(void)
 		reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
 	}
 #endif
-	reserve_ebda_region();
+
+	if (platform_has(X86_PLATFORM_FEATURE_BIOS))
+		reserve_ebda_region();
 
 	/*
 	 * At this point everything still needed from the boot loader
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index be5ae80..1a5ef7b 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -88,6 +88,7 @@
 #include <asm/processor.h>
 #include <asm/bugs.h>
 
+#include <asm/platform_feature.h>
 #include <asm/system.h>
 #include <asm/vsyscall.h>
 #include <asm/cpu.h>
@@ -731,7 +732,7 @@ void __init setup_arch(char **cmdline_p)
 #endif
 
 	ARCH_SETUP
-
+	platform_feature_init_default(boot_params.hdr.hardware_subarch);
 	setup_memory_map();
 	parse_setup_data();
 	/* update the e820_saved too */
@@ -809,7 +810,8 @@ void __init setup_arch(char **cmdline_p)
 	init_hypervisor(&boot_cpu_data);
 
 #ifdef CONFIG_X86_32
-	probe_roms();
+	if (platform_has(X86_PLATFORM_FEATURE_BIOS))
+		probe_roms();
 #endif
 
 	/* after parse_early_param, so could debug it */
@@ -987,9 +989,11 @@ void __init setup_arch(char **cmdline_p)
 	e820_mark_nosave_regions(max_low_pfn);
 
 #ifdef CONFIG_X86_32
-	request_resource(&iomem_resource, &video_ram_resource);
+	if (platform_has(X86_PLATFORM_FEATURE_BIOS))
+		request_resource(&iomem_resource, &video_ram_resource);
 #endif
-	reserve_standard_io_resources();
+	if (platform_has(X86_PLATFORM_FEATURE_ISA))
+		reserve_standard_io_resources();
 
 	e820_setup_gap();
 
-- 
1.5.6.5

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