linux-kernel - [PATCH v7u1 06/31] x86, 64bit, realmode: use init_level4_pgt to set trapmoline

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Date:	Thu,  3 Jan 2013 16:48:26 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>, Jan Kiszka <jan.kiszka@....de>,
	Jason Wessel <jason.wessel@...driver.com>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
	Jarkko Sakkinen <jarkko.sakkinen@...el.com>
Subject: [PATCH v7u1 06/31] x86, 64bit, realmode: use init_level4_pgt to set trapmoline_pgt directly

with #PF handler way to set early page table, level3_ident will go away with
64bit native path.

So just use entries in init_level4_pgt to set them in tramopline_pgt

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: Jarkko Sakkinen <jarkko.sakkinen@...el.com>
---
 arch/x86/realmode/init.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index b96fe6f..384b3f4 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -78,8 +78,8 @@ void __init setup_real_mode(void)
 	*trampoline_cr4_features = read_cr4();
 
 	trampoline_pgd = (u64 *) __va(real_mode_header->trampoline_pgd);
-	trampoline_pgd[0] = __pa_symbol(level3_ident_pgt) + _KERNPG_TABLE;
-	trampoline_pgd[511] = __pa_symbol(level3_kernel_pgt) + _KERNPG_TABLE;
+	trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd;
+	trampoline_pgd[511] = init_level4_pgt[511].pgd;
 #endif
 }
 
-- 
1.7.10.4

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