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Subject[PATCH] x86/efi: earlyprintk - Add 64bit efi fb address support
Date
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@canonical.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
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