linux-kernel - [PATCH] x86/efi: earlyprintk - Add 64bit efi fb address support

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Message-Id: <1536423828-5693-1-git-send-email-aaron.ma@canonical.com>
Date:   Sun,  9 Sep 2018 00:23:48 +0800
From:   Aaron Ma <aaron.ma@...onical.com>
To:     ard.biesheuvel@...aro.org, tglx@...utronix.de, x86@...nel.org,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        aaron.ma@...onical.com
Subject: [PATCH] x86/efi: earlyprintk - Add 64bit efi fb address support

EFI GOP uses 64-bit frame buffer address in some BIOS.
Add 64bit address support in efi earlyprintk.

Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
---
 arch/x86/platform/efi/early_printk.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/platform/efi/early_printk.c b/arch/x86/platform/efi/early_printk.c
index 5fdacb322ceb..c0ae25f59acd 100644
--- a/arch/x86/platform/efi/early_printk.c
+++ b/arch/x86/platform/efi/early_printk.c
@@ -32,6 +32,8 @@ static __init int early_efi_map_fb(void)
 		return 0;
 
 	base = boot_params.screen_info.lfb_base;
+	if (boot_params.screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
+		base |= (u64)boot_params.screen_info.ext_lfb_base << 32;
 	size = boot_params.screen_info.lfb_size;
 	efi_fb = ioremap(base, size);
 
@@ -49,6 +51,8 @@ static __ref void *early_efi_map(unsigned long start, unsigned long len)
 	unsigned long base;
 
 	base = boot_params.screen_info.lfb_base;
+	if (boot_params.screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
+		base |= (u64)boot_params.screen_info.ext_lfb_base << 32;
 
 	if (efi_fb)
 		return (efi_fb + start);
-- 
2.17.1