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-rw-r--r--arch/i386/boot/video.S14
-rw-r--r--arch/x86_64/boot/video.S14
2 files changed, 28 insertions, 0 deletions
diff --git a/arch/i386/boot/video.S b/arch/i386/boot/video.S
index 2c5b5cc55f7..8143c9516cb 100644
--- a/arch/i386/boot/video.S
+++ b/arch/i386/boot/video.S
@@ -571,6 +571,16 @@ setr1: lodsw
jmp _m_s
check_vesa:
+#ifdef CONFIG_FIRMWARE_EDID
+ leaw modelist+1024, %di
+ movw $0x4f00, %ax
+ int $0x10
+ cmpw $0x004f, %ax
+ jnz setbad
+
+ movw 4(%di), %ax
+ movw %ax, vbe_version
+#endif
leaw modelist+1024, %di
subb $VIDEO_FIRST_VESA>>8, %bh
movw %bx, %cx # Get mode information structure
@@ -1945,6 +1955,9 @@ store_edid:
rep
stosl
+ cmpw $0x0200, vbe_version # only do EDID on >= VBE2.0
+ jl no_edid
+
pushw %es # save ES
xorw %di, %di # Report Capability
pushw %di
@@ -1987,6 +2000,7 @@ do_restore: .byte 0 # Screen contents altered during mode change
svga_prefix: .byte VIDEO_FIRST_BIOS>>8 # Default prefix for BIOS modes
graphic_mode: .byte 0 # Graphic mode with a linear frame buffer
dac_size: .byte 6 # DAC bit depth
+vbe_version: .word 0 # VBE bios version
# Status messages
keymsg: .ascii "Press <RETURN> to see video modes available, "
diff --git a/arch/x86_64/boot/video.S b/arch/x86_64/boot/video.S
index d6ff88f3513..6090516c9c7 100644
--- a/arch/x86_64/boot/video.S
+++ b/arch/x86_64/boot/video.S
@@ -571,6 +571,16 @@ setr1: lodsw
jmp _m_s
check_vesa:
+#ifdef CONFIG_FIRMWARE_EDID
+ leaw modelist+1024, %di
+ movw $0x4f00, %ax
+ int $0x10
+ cmpw $0x004f, %ax
+ jnz setbad
+
+ movw 4(%di), %ax
+ movw %ax, vbe_version
+#endif
leaw modelist+1024, %di
subb $VIDEO_FIRST_VESA>>8, %bh
movw %bx, %cx # Get mode information structure
@@ -1945,6 +1955,9 @@ store_edid:
rep
stosl
+ cmpw $0x0200, vbe_version # only do EDID on >= VBE2.0
+ jl no_edid
+
pushw %es # save ES
xorw %di, %di # Report Capability
pushw %di
@@ -1987,6 +2000,7 @@ do_restore: .byte 0 # Screen contents altered during mode change
svga_prefix: .byte VIDEO_FIRST_BIOS>>8 # Default prefix for BIOS modes
graphic_mode: .byte 0 # Graphic mode with a linear frame buffer
dac_size: .byte 6 # DAC bit depth
+vbe_version: .word 0 # VBE bios version
# Status messages
keymsg: .ascii "Press <RETURN> to see video modes available, "