Sync. x86bios with HEAD.
- Detect illegal access to unmapped memory within real mode emulator.
- Map EBDA if available and support memory wraparound above 1MB as VM86 does.
- Set initial %ds to 0x40 as X.org int10 handler does.
- Print the initial memory map when bootverbose is set.
- Optimize real mode page table lookup.
- Add strictly aligned memory access for distant future.
- Update copyright date.
Fix stupid typos. Some VESA BIOSes directly call BIOS interrupt handlers
within the VBE interrupt handler. Unfortunately it was causing real mode
page faults because we were fetching instructions from bogus addresses.
PR: kern/144654
framebuffer driver, etc. work on FreeBSD/amd64.
A significant amount of improvements were done by jkim@ during the recent
months to make vesa(4) work better, over the initial code import. This
work is based on OpenBSD's x86emu implementation and contributed by
paradox <ddkprog yahoo com> and swell.k at gmail com.
Hopefully I have stolen all their work to 8-STABLE :)
All bugs in this commit are mine, as usual.
