2000/1018/pc/apm.c (diff list | history)

2000/1018/sys/src/9/pc/apm.c:1,5 – 2000/1019/sys/src/9/pc/apm.c:1,12 (short | long | prev | next)
Bug fix: work around NEC Versa SX hardware issue. Comment edits. rsc Fri Mar 4 12:44:25 2005
2000/1018		/* * Advanced Power Management 1.2 driver
2000/1019		* Interface to Advanced Power Management 1.2 BIOS * * This is, in many ways, a giant hack, and when things settle down * a bit and standardize, hopefully we can write a driver that deals * more directly with the hardware and thus might be a bit cleaner. * * ACPI might be the answer, but at the moment this is simpler * and more widespread.
2000/1018		*/ #include "u.h"
2000/1018/sys/src/9/pc/apm.c:39,44 – 2000/1019/sys/src/9/pc/apm.c:46,54
2000/1018		* type is 0 for system segment, 1 for code/data. * * clearly we know way too much about the memory unit.
2000/1019		* however, knowing this much about the memory unit * means that the memory unit need not know anything * about us.
2000/1018		* * what a crock. */
2000/1018/sys/src/9/pc/apm.c:67,79 – 2000/1019/sys/src/9/pc/apm.c:77,82
2000/1018		lgdt(ptr); } /* * Must run before mmuinit, since we modify the GDT that * we want the processor to inherit. I think (but am not sure) * that we could run after mmuinit on processor 0 and just * modify m->gdt and then call lgdt() as mmuinit() does, * but this is a bit simpler and safer. */ static ulong ax, cx, dx, di, ebx, esi; static Ureg apmu; static long
2000/1018/sys/src/9/pc/apm.c:139,144 – 2000/1019/sys/src/9/pc/apm.c:142,154
2000/1018		print("apm: missing register %s\n", s); return; }
2000/1019		/* * The NEC Versa SX bios does not report the correct 16-bit code * segment length when loaded directly from mbr -> 9load (as compared * with going through ld.com). We'll make both code segments 64k-1 bytes. */ esi = 0xFFFFFFFF;
2000/1018		/* * We are required by the BIOS to set up three consecutive segments,