linux-kernel - Re: [PATCH] x86: Reserve legacy VGA MMIO area for x86_64 as well as x86

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Date:	Fri, 09 Apr 2010 16:01:44 -0700
From:	Yinghai <yinghai.lu@...cle.com>
To:	Andy Isaacson <adi@...apodia.org>
CC:	Yinghai Lu <yinghai.lu@...cle.com>, guenter.roeck@...csson.com,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Renninger <trenn@...e.de>
Subject: Re: [PATCH] x86: Reserve legacy VGA MMIO area for x86_64 as well
 as x86_32

Please check

Subject: [PATCH] x86: reserve [0xa0000, 0x100000] in e820

Update e820 at first, and later put them resource tree.

-V2: reserved that early, no PCI BAR can use it, force them to get new one

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: Guenter Roeck <guenter.roeck@...csson.com>
Cc: Andy Isaacson <adi@...apodia.org>
Cc: Bjorn Helgaas <bjorn.helgaas@...com>
Acked-by: H. Peter Anvin <hpa@...or.com>

---
 arch/x86/include/asm/setup.h |    1 -
 arch/x86/kernel/e820.c       |    2 +-
 arch/x86/kernel/head32.c     |    1 -
 arch/x86/kernel/setup.c      |   19 +------------------
 4 files changed, 2 insertions(+), 21 deletions(-)

Index: linux-2.6/arch/x86/include/asm/setup.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/setup.h
+++ linux-2.6/arch/x86/include/asm/setup.h
@@ -44,7 +44,6 @@ static inline void visws_early_detect(vo
 extern unsigned long saved_video_mode;
 
 extern void reserve_standard_io_resources(void);
-extern void i386_reserve_resources(void);
 extern void setup_default_timer_irq(void);
 
 #ifdef CONFIG_X86_MRST
Index: linux-2.6/arch/x86/kernel/head32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/head32.c
+++ linux-2.6/arch/x86/kernel/head32.c
@@ -22,7 +22,6 @@ static void __init i386_default_early_se
 {
 	/* Initilize 32bit specific setup functions */
 	x86_init.resources.probe_roms = probe_roms;
-	x86_init.resources.reserve_resources = i386_reserve_resources;
 	x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
 
 	reserve_ebda_region();
Index: linux-2.6/arch/x86/kernel/setup.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup.c
+++ linux-2.6/arch/x86/kernel/setup.c
@@ -693,7 +693,7 @@ static void __init trim_bios_range(void)
 	 * area (640->1Mb) as ram even though it is not.
 	 * take them out.
 	 */
-	e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
+	e820_add_region(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RESERVED);
 	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 }
 
@@ -1052,20 +1052,3 @@ void __init setup_arch(char **cmdline_p)
 
 	mcheck_init();
 }
-
-#ifdef CONFIG_X86_32
-
-static struct resource video_ram_resource = {
-	.name	= "Video RAM area",
-	.start	= 0xa0000,
-	.end	= 0xbffff,
-	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
-};
-
-void __init i386_reserve_resources(void)
-{
-	request_resource(&iomem_resource, &video_ram_resource);
-	reserve_standard_io_resources();
-}
-
-#endif /* CONFIG_X86_32 */
--
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