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

Ard Biesheuvel
2018-09-27T08:51:15Z

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(-)

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);
--
2.18.0