ed10c810db
boot2 calls back into boot1 to perform disk reads. The ZFS MBR boot blocks do not have the same space constraints, so remove this hack for ZFS. While here, remove commented out code to support C/H/S addressing from zfsldr. The ZFS and GPT bootstraps always just use EDD LBA addressing. MFC after: 2 weeks
132 lines
2.7 KiB
C
132 lines
2.7 KiB
C
/*-
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* Copyright (c) 1998 Robert Nordier
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* Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are freely
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* permitted provided that the above copyright notice and this
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* paragraph and the following disclaimer are duplicated in all
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* such forms.
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*
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* This software is provided "AS IS" and without any express or
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* implied warranties, including, without limitation, the implied
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* warranties of merchantability and fitness for a particular
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* purpose.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <machine/psl.h>
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#include <btxv86.h>
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#include "rbx.h"
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#include "util.h"
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#include "drv.h"
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#ifdef USE_XREAD
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#include "xreadorg.h"
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#endif
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#define V86_CY(x) ((x) & PSL_C)
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#define V86_ZR(x) ((x) & PSL_Z)
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#ifdef GPT
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uint64_t
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drvsize(struct dsk *dskp)
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{
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unsigned char params[0x42];
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uint64_t sectors;
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*(uint32_t *)params = sizeof(params);
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v86.ctl = V86_FLAGS;
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v86.addr = 0x13;
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v86.eax = 0x4800;
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v86.edx = dskp->drive;
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v86.ds = VTOPSEG(params);
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v86.esi = VTOPOFF(params);
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v86int();
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if (V86_CY(v86.efl)) {
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printf("error %u\n", v86.eax >> 8 & 0xff);
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return (0);
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}
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memcpy(§ors, params + 0x10, sizeof(sectors));
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return (sectors);
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}
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#endif /* GPT */
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#ifndef USE_XREAD
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static struct {
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uint16_t len;
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uint16_t count;
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uint16_t off;
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uint16_t seg;
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uint64_t lba;
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} packet;
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#endif
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int
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drvread(struct dsk *dskp, void *buf, daddr_t lba, unsigned nblk)
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{
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static unsigned c = 0x2d5c7c2f;
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if (!OPT_CHECK(RBX_QUIET))
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printf("%c\b", c = c << 8 | c >> 24);
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#ifndef USE_XREAD
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packet.len = 0x10;
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packet.count = nblk;
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packet.off = VTOPOFF(buf);
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packet.seg = VTOPSEG(buf);
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packet.lba = lba;
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v86.ctl = V86_FLAGS;
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v86.addr = 0x13;
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v86.eax = 0x4200;
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v86.edx = dskp->drive;
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v86.ds = VTOPSEG(&packet);
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v86.esi = VTOPOFF(&packet);
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#else /* USE_XREAD */
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v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
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v86.addr = XREADORG; /* call to xread in boot1 */
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v86.es = VTOPSEG(buf);
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v86.eax = lba;
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v86.ebx = VTOPOFF(buf);
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v86.ecx = lba >> 32;
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v86.edx = nblk << 8 | dskp->drive;
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#endif /* USE_XREAD */
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v86int();
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if (V86_CY(v86.efl)) {
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printf("%s: error %u lba %u\n",
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BOOTPROG, v86.eax >> 8 & 0xff, lba);
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return (-1);
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}
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return (0);
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}
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#ifdef GPT
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int
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drvwrite(struct dsk *dskp, void *buf, daddr_t lba, unsigned nblk)
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{
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packet.len = 0x10;
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packet.count = nblk;
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packet.off = VTOPOFF(buf);
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packet.seg = VTOPSEG(buf);
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packet.lba = lba;
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v86.ctl = V86_FLAGS;
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v86.addr = 0x13;
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v86.eax = 0x4300;
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v86.edx = dskp->drive;
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v86.ds = VTOPSEG(&packet);
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v86.esi = VTOPOFF(&packet);
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v86int();
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if (V86_CY(v86.efl)) {
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printf("error %u lba %u\n", v86.eax >> 8 & 0xff, lba);
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return (-1);
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}
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return (0);
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}
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#endif /* GPT */
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