From: Ard Biesheuvel <[email protected]> This adds code to the ARM and arm64 EFI init routines to expose a platform device of type 'efi-framebuffer' if struct screen_info has been populated appropriately from the GOP protocol by the stub. Since the framebuffer may potentially be located in system RAM, make sure that the region is reserved and marked MEMBLOCK_NOMAP.
Signed-off-by: Ard Biesheuvel <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Will Deacon <[email protected]> Cc: David Herrmann <[email protected]> Cc: Peter Jones <[email protected]> Signed-off-by: Matt Fleming <[email protected]> --- drivers/firmware/efi/arm-init.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c index ac95dd8b119f..7a3318dd4319 100644 --- a/drivers/firmware/efi/arm-init.c +++ b/drivers/firmware/efi/arm-init.c @@ -19,6 +19,7 @@ #include <linux/mm_types.h> #include <linux/of.h> #include <linux/of_fdt.h> +#include <linux/platform_device.h> #include <linux/screen_info.h> #include <asm/efi.h> @@ -78,6 +79,10 @@ static void __init init_screen_info(void) screen_info.orig_video_cols = 80; screen_info.orig_video_lines = 25; } + + if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI && + memblock_is_map_memory(screen_info.lfb_base)) + memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size); } static int __init uefi_init(void) @@ -256,3 +261,16 @@ void __init efi_init(void) init_screen_info(); } + +static int __init register_gop_device(void) +{ + void *pd; + + if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) + return 0; + + pd = platform_device_register_data(NULL, "efi-framebuffer", 0, + &screen_info, sizeof(screen_info)); + return PTR_ERR_OR_ZERO(pd); +} +subsys_initcall(register_gop_device); -- 2.7.3
