diff options
Diffstat (limited to 'arch/x86/boot/video.h')
-rw-r--r-- | arch/x86/boot/video.h | 14 |
1 files changed, 0 insertions, 14 deletions
diff --git a/arch/x86/boot/video.h b/arch/x86/boot/video.h index ee63f5d14461..5bb174a997fc 100644 --- a/arch/x86/boot/video.h +++ b/arch/x86/boot/video.h | |||
@@ -112,20 +112,6 @@ extern int force_x, force_y; /* Don't query the BIOS for cols/rows */ | |||
112 | extern int do_restore; /* Restore screen contents */ | 112 | extern int do_restore; /* Restore screen contents */ |
113 | extern int graphic_mode; /* Graphics mode with linear frame buffer */ | 113 | extern int graphic_mode; /* Graphics mode with linear frame buffer */ |
114 | 114 | ||
115 | /* | ||
116 | * int $0x10 is notorious for touching registers it shouldn't. | ||
117 | * gcc doesn't like %ebp being clobbered, so define it as a push/pop | ||
118 | * sequence here. | ||
119 | * | ||
120 | * A number of systems, including the original PC can clobber %bp in | ||
121 | * certain circumstances, like when scrolling. There exists at least | ||
122 | * one Trident video card which could clobber DS under a set of | ||
123 | * circumstances that we are unlikely to encounter (scrolling when | ||
124 | * using an extended graphics mode of more than 800x600 pixels), but | ||
125 | * it's cheap insurance to deal with that here. | ||
126 | */ | ||
127 | #define INT10 "pushl %%ebp; pushw %%ds; int $0x10; popw %%ds; popl %%ebp" | ||
128 | |||
129 | /* Accessing VGA indexed registers */ | 115 | /* Accessing VGA indexed registers */ |
130 | static inline u8 in_idx(u16 port, u8 index) | 116 | static inline u8 in_idx(u16 port, u8 index) |
131 | { | 117 | { |