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efi/arm/libstub: Make screen_info accessible to the UEFI stub

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In order to hand over the framebuffer described by the GOP protocol and
discovered by the UEFI stub, make struct screen_info accessible by the
stub. This involves allocating a loader data buffer and passing it to the
kernel proper via a UEFI Configuration Table, since the UEFI stub executes
in the context of the decompressor, and cannot access the kernel's copy of
struct screen_info directly.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Borislav Petkov <bp@alien8.de>
Cc: David Herrmann <dh.herrmann@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Jones <pjones@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-22-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ard Biesheuvel
2016-04-25 21:06:53 +01:00
committed by Ingo Molnar
parent 57fdb89aeb
commit 801820bee9
6 changed files with 88 additions and 5 deletions
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11
include/linux/efi.h
View File

@@ -286,7 +286,7 @@ typedef struct {
efi_status_t (*locate_handle)(int, efi_guid_t *, void *,
unsigned long *, efi_handle_t *);
void *locate_device_path;
void *install_configuration_table;
efi_status_t (*install_configuration_table)(efi_guid_t *, void *);
void *load_image;
void *start_image;
void *exit;
@@ -633,6 +633,15 @@ void efi_native_runtime_setup(void);
EFI_GUID(0xd3b36f2c, 0xd551, 0x11d4, \
0x9a, 0x46, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d)
/*
* This GUID is used to pass to the kernel proper the struct screen_info
* structure that was populated by the stub based on the GOP protocol instance
* associated with ConOut
*/
#define LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID \
EFI_GUID(0xe03fc20a, 0x85dc, 0x406e, \
0xb9, 0xe, 0x4a, 0xb5, 0x02, 0x37, 0x1d, 0x95)
typedef struct {
efi_guid_t guid;
u64 table;