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File: [local] / sys / arch / amd64 / stand / libsa / gateA20.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:04:52 2008 UTC (16 years, 4 months ago) by nbrk
Import of OpenBSD 4.2 release kernel tree with initial code to support Jornada 720/728, StrongARM 1110-based handheld PC. At this point kernel roots on NFS and boots into vfs_mountroot() and traps. What is supported: - glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode (needs some palette tweaks for non black/white/blue colors, i think) - saic, SA11x0 interrupt controller (needs cleanup) - sacom, SA11x0 UART (supported only as boot console for now) - SA11x0 GPIO controller fully supported (but can't handle multiple interrupt handlers on one gpio pin) - sassp, SSP port on SA11x0 that attaches spibus - Jornada microcontroller (jmcu) to control kbd, battery, etc throught the SPI bus (wskbd attaches on jmcu, but not tested) - tod functions seem work - initial code for SA-1111 (chip companion) : this is TODO Next important steps, i think: - gpio and intc on sa1111 - pcmcia support for sa11x0 (and sa1111 help logic) - REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs) - root on wd0! (using already supported PCMCIA-ATA) |
/* $OpenBSD: gateA20.c,v 1.2 2004/03/21 21:37:41 tom Exp $ */ /* * Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 * * Mach Operating System * Copyright (c) 1992, 1991 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ #include <sys/param.h> #include <sys/types.h> #include <machine/pio.h> #include <dev/ic/i8042reg.h> #include <dev/isa/isareg.h> #include "libsa.h" int ps2model = 0; /* Not set in amd64 */ #define KB_A20 0xdf /* enable A20, enable output buffer full interrupt enable data line enable clock line */ /* * "Probe"-style routine (no parameters) to turn A20 on */ void gateA20on(void) { gateA20(1); } /* * Gate A20 for high memory */ void gateA20(int on) { if (ps2model == 0xf82 || (inb(IO_KBD + KBSTATP) == 0xff && inb(IO_KBD + KBDATAP) == 0xff)) { int data; /* Try to use 0x92 to turn on A20 */ if (on) { data = inb(0x92); outb(0x92, data | 0x2); } else { data = inb(0x92); outb(0x92, data & ~0x2); } } else { while (inb(IO_KBD + KBSTATP) & KBS_IBF); while (inb(IO_KBD + KBSTATP) & KBS_DIB) (void)inb(IO_KBD + KBDATAP); outb(IO_KBD + KBCMDP, KBC_CMDWOUT); while (inb(IO_KBD + KBSTATP) & KBS_IBF); if (on) outb(IO_KBD + KBDATAP, KB_A20); else outb(IO_KBD + KBDATAP, 0xcd); while (inb(IO_KBD + KBSTATP) & KBS_IBF); while (inb(IO_KBD + KBSTATP) & KBS_DIB) (void)inb(IO_KBD + KBDATAP); } }