Add an experimental feature to shadow video BIOS.  Long ago, this trick was supported by many BIOSes to improve performance of VESA BIOS calls for real mode OSes but it is not our intention here.  However, this may help some platforms where the video ROMs are inaccessible after suspend, for example. Note it may consume up to 64K bytes of contiguous memory depending on video controller model when it is enabled.  This feature can be disabled by setting zero to 'debug.vesa.shadow_rom' loader tunable via loader(8) or loader.conf(5).  The default is 1 (enabled), for now.
Add an experimental feature to shadow video BIOS.  Long ago, this trick was
supported by many BIOSes to improve performance of VESA BIOS calls for real
mode OSes but it is not our intention here.  However, this may help some
platforms where the video ROMs are inaccessible after suspend, for example.
Note it may consume up to 64K bytes of contiguous memory depending on video
controller model when it is enabled.  This feature can be disabled by
setting zero to 'debug.vesa.shadow_rom' loader tunable via loader(8) or
loader.conf(5).  The default is 1 (enabled), for now.

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