diff mbox series

[09/11] efi/x86: earlyprintk - Add 64bit efi fb address support

Message ID 20180927085039.8391-10-ard.biesheuvel@linaro.org
State Accepted
Commit b8b39bff3c7c07a5a8c85ebfd25d5b3ab3b3e2a1
Headers show
Series EFI updates for v4.20 | expand

Commit Message

Ard Biesheuvel Sept. 27, 2018, 8:50 a.m. UTC 
From: Aaron Ma <aaron.ma@canonical.com>


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>

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 arch/x86/platform/efi/early_printk.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

-- 
2.18.0
diff mbox series

Patch

diff --git a/arch/x86/platform/efi/early_printk.c b/arch/x86/platform/efi/early_printk.c
index 5fdacb322ceb..7476b3b097e1 100644
--- a/arch/x86/platform/efi/early_printk.c
+++ b/arch/x86/platform/efi/early_printk.c
@@ -26,12 +26,14 @@  static bool early_efi_keep;
  */
 static __init int early_efi_map_fb(void)
 {
-	unsigned long base, size;
+	u64 base, size;
 
 	if (!early_efi_keep)
 		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);
 
@@ -46,9 +48,11 @@  early_initcall(early_efi_map_fb);
  */
 static __ref void *early_efi_map(unsigned long start, unsigned long len)
 {
-	unsigned long base;
+	u64 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);