When booting directly from EFI, obtaining this information from EFI is
the only possible way. And even when booting with a boot loader
interposed, it's more clean not to use legacy BIOS calls for this
purpose. (The downside being that there are no "capabilities" that we
can retrieve the EFI way.)
To achieve this we need to propagate the handle used to obtain the
EFI_GRAPHICS_OUTPUT_PROTOCOL instance for further obtaining an
EFI_EDID_*_PROTOCOL instance, which has been part of the spec since 2.5.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
Setting boot_edid_caps to zero isn't desirable, but arbitrarily setting
one or both of the two low bits also doesn't seem appropriate.
GrUB also checks an "agp-internal-edid" variable. As I haven't been able
to find any related documentation, and as GrUB being happy about the
variable being any size (rather than at least / precisely 128 bytes),
I didn't follow that route.
---
v2: New.
--- a/xen/arch/arm/efi/efi-boot.h
+++ b/xen/arch/arm/efi/efi-boot.h
@@ -430,6 +430,10 @@ static void __init efi_arch_edd(void)
{
}
+static void __init efi_arch_edid(EFI_HANDLE gop_handle)
+{
+}
+
static void __init efi_arch_memory_setup(void)
{
}
--- a/xen/arch/x86/boot/video.S
+++ b/xen/arch/x86/boot/video.S
@@ -922,7 +922,14 @@ store_edid:
pushw %dx
pushw %di
- cmpb $1, bootsym(opt_edid) # EDID disabled on cmdline (edid=no)?
+ movb bootsym(opt_edid), %al
+ cmpw $0x1313, bootsym(boot_edid_caps) # Data already retrieved?
+ je .Lcheck_edid
+ cmpb $2, %al # EDID forced on cmdline (edid=force)?
+ jne .Lno_edid
+
+.Lcheck_edid:
+ cmpb $1, %al # EDID disabled on cmdline (edid=no)?
je .Lno_edid
leaw vesa_glob_info, %di
--- a/xen/arch/x86/efi/efi-boot.h
+++ b/xen/arch/x86/efi/efi-boot.h
@@ -568,6 +568,49 @@ static void __init efi_arch_video_init(E
#endif
}
+#ifdef CONFIG_VIDEO
+static bool __init copy_edid(const void *buf, unsigned int size)
+{
+ /*
+ * Be conservative - for both undersized and oversized blobs it is unclear
+ * what to actually do with them. The more that unlike the VESA BIOS
+ * interface we also have no associated "capabilities" value (which might
+ * carry a hint as to possible interpretation).
+ */
+ if ( size != ARRAY_SIZE(boot_edid_info) )
+ return false;
+
+ memcpy(boot_edid_info, buf, size);
+ boot_edid_caps = 0;
+
+ return true;
+}
+#endif
+
+static void __init efi_arch_edid(EFI_HANDLE gop_handle)
+{
+#ifdef CONFIG_VIDEO
+ static EFI_GUID __initdata active_guid = EFI_EDID_ACTIVE_PROTOCOL_GUID;
+ static EFI_GUID __initdata discovered_guid = EFI_EDID_DISCOVERED_PROTOCOL_GUID;
+ EFI_EDID_ACTIVE_PROTOCOL *active_edid;
+ EFI_EDID_DISCOVERED_PROTOCOL *discovered_edid;
+ EFI_STATUS status;
+
+ status = efi_bs->OpenProtocol(gop_handle, &active_guid,
+ (void **)&active_edid, efi_ih, NULL,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+ if ( status == EFI_SUCCESS &&
+ copy_edid(active_edid->Edid, active_edid->SizeOfEdid) )
+ return;
+
+ status = efi_bs->OpenProtocol(gop_handle, &discovered_guid,
+ (void **)&discovered_edid, efi_ih, NULL,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+ if ( status == EFI_SUCCESS )
+ copy_edid(discovered_edid->Edid, discovered_edid->SizeOfEdid);
+#endif
+}
+
static void __init efi_arch_memory_setup(void)
{
unsigned int i;
@@ -729,6 +772,7 @@ static void __init efi_arch_flush_dcache
void __init efi_multiboot2(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
{
EFI_GRAPHICS_OUTPUT_PROTOCOL *gop;
+ EFI_HANDLE gop_handle;
UINTN cols, gop_mode = ~0, rows;
__set_bit(EFI_BOOT, &efi_flags);
@@ -742,11 +786,15 @@ void __init efi_multiboot2(EFI_HANDLE Im
&cols, &rows) == EFI_SUCCESS )
efi_arch_console_init(cols, rows);
- gop = efi_get_gop();
+ gop = efi_get_gop(&gop_handle);
if ( gop )
+ {
gop_mode = efi_find_gop_mode(gop, 0, 0, 0);
+ efi_arch_edid(gop_handle);
+ }
+
efi_arch_edd();
efi_arch_cpu();
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -131,7 +131,7 @@ static bool match_guid(const EFI_GUID *g
static void efi_init(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable);
static void efi_console_set_mode(void);
-static EFI_GRAPHICS_OUTPUT_PROTOCOL *efi_get_gop(void);
+static EFI_GRAPHICS_OUTPUT_PROTOCOL *efi_get_gop(EFI_HANDLE *gop_handle);
static UINTN efi_find_gop_mode(EFI_GRAPHICS_OUTPUT_PROTOCOL *gop,
UINTN cols, UINTN rows, UINTN depth);
static void efi_tables(void);
@@ -747,7 +747,7 @@ static void __init efi_console_set_mode(
StdOut->SetMode(StdOut, best);
}
-static EFI_GRAPHICS_OUTPUT_PROTOCOL __init *efi_get_gop(void)
+static EFI_GRAPHICS_OUTPUT_PROTOCOL __init *efi_get_gop(EFI_HANDLE *gop_handle)
{
EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *mode_info;
EFI_GRAPHICS_OUTPUT_PROTOCOL *gop = NULL;
@@ -772,7 +772,10 @@ static EFI_GRAPHICS_OUTPUT_PROTOCOL __in
continue;
status = gop->QueryMode(gop, gop->Mode->Mode, &info_size, &mode_info);
if ( !EFI_ERROR(status) )
+ {
+ *gop_handle = handles[i];
break;
+ }
}
if ( handles )
efi_bs->FreePool(handles);
@@ -1219,6 +1222,7 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SY
if ( use_cfg_file )
{
EFI_FILE_HANDLE dir_handle;
+ EFI_HANDLE gop_handle;
UINTN depth, cols, rows, size;
size = cols = rows = depth = 0;
@@ -1227,7 +1231,7 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SY
&cols, &rows) == EFI_SUCCESS )
efi_arch_console_init(cols, rows);
- gop = efi_get_gop();
+ gop = efi_get_gop(&gop_handle);
/* Get the file system interface. */
dir_handle = get_parent_handle(loaded_image, &file_name);
@@ -1364,12 +1368,15 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SY
dir_handle->Close(dir_handle);
if ( gop && !base_video )
+ {
gop_mode = efi_find_gop_mode(gop, cols, rows, depth);
+
+ efi_arch_edid(gop_handle);
+ }
}
efi_arch_edd();
- /* XXX Collect EDID info. */
efi_arch_cpu();
efi_tables();
--- a/xen/include/efi/efiprot.h
+++ b/xen/include/efi/efiprot.h
@@ -724,5 +724,52 @@ struct _EFI_GRAPHICS_OUTPUT_PROTOCOL {
EFI_GRAPHICS_OUTPUT_PROTOCOL_BLT Blt;
EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE *Mode;
};
+
+/*
+ * EFI EDID Discovered Protocol
+ * UEFI Specification Version 2.5 Section 11.9
+ */
+#define EFI_EDID_DISCOVERED_PROTOCOL_GUID \
+ { 0x1C0C34F6, 0xD380, 0x41FA, { 0xA0, 0x49, 0x8a, 0xD0, 0x6C, 0x1A, 0x66, 0xAA} }
+
+typedef struct _EFI_EDID_DISCOVERED_PROTOCOL {
+ UINT32 SizeOfEdid;
+ UINT8 *Edid;
+} EFI_EDID_DISCOVERED_PROTOCOL;
+
+/*
+ * EFI EDID Active Protocol
+ * UEFI Specification Version 2.5 Section 11.9
+ */
+#define EFI_EDID_ACTIVE_PROTOCOL_GUID \
+ { 0xBD8C1056, 0x9F36, 0x44EC, { 0x92, 0xA8, 0xA6, 0x33, 0x7F, 0x81, 0x79, 0x86} }
+
+typedef struct _EFI_EDID_ACTIVE_PROTOCOL {
+ UINT32 SizeOfEdid;
+ UINT8 *Edid;
+} EFI_EDID_ACTIVE_PROTOCOL;
+
+/*
+ * EFI EDID Override Protocol
+ * UEFI Specification Version 2.5 Section 11.9
+ */
+#define EFI_EDID_OVERRIDE_PROTOCOL_GUID \
+ { 0x48ECB431, 0xFB72, 0x45C0, { 0xA9, 0x22, 0xF4, 0x58, 0xFE, 0x04, 0x0B, 0xD5} }
+
+INTERFACE_DECL(_EFI_EDID_OVERRIDE_PROTOCOL);
+
+typedef
+EFI_STATUS
+(EFIAPI *EFI_EDID_OVERRIDE_PROTOCOL_GET_EDID) (
+ IN struct _EFI_EDID_OVERRIDE_PROTOCOL *This,
+ IN EFI_HANDLE *ChildHandle,
+ OUT UINT32 *Attributes,
+ IN OUT UINTN *EdidSize,
+ IN OUT UINT8 **Edid);
+
+typedef struct _EFI_EDID_OVERRIDE_PROTOCOL {
+ EFI_EDID_OVERRIDE_PROTOCOL_GET_EDID GetEdid;
+} EFI_EDID_OVERRIDE_PROTOCOL;
+
#endif
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