562 lines
14 KiB
C
562 lines
14 KiB
C
// 16bit code to access cdrom drives.
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//
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// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
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// Copyright (C) 2002 MandrakeSoft S.A.
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//
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// This file may be distributed under the terms of the GNU LGPLv3 license.
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#include "disk.h" // cdrom_13
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#include "util.h" // memset
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#include "bregs.h" // struct bregs
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#include "biosvar.h" // GET_EBDA
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#include "atabits.h" // ATA_TYPE_ATAPI
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/****************************************************************
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* CDROM functions
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****************************************************************/
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// read disk drive size
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static void
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cdrom_1315(struct bregs *regs, u8 device)
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{
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disk_ret(regs, DISK_RET_EADDRNOTFOUND);
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}
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// lock
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static void
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cdrom_134500(struct bregs *regs, u8 device)
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{
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u16 ebda_seg = get_ebda_seg();
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u8 locks = GET_EBDA2(ebda_seg, cdrom_locks[device]);
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if (locks == 0xff) {
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regs->al = 1;
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disk_ret(regs, DISK_RET_ETOOMANYLOCKS);
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return;
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}
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SET_EBDA2(ebda_seg, cdrom_locks[device], locks + 1);
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regs->al = 1;
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disk_ret(regs, DISK_RET_SUCCESS);
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}
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// unlock
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static void
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cdrom_134501(struct bregs *regs, u8 device)
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{
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u16 ebda_seg = get_ebda_seg();
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u8 locks = GET_EBDA2(ebda_seg, cdrom_locks[device]);
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if (locks == 0x00) {
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regs->al = 0;
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disk_ret(regs, DISK_RET_ENOTLOCKED);
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return;
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}
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locks--;
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SET_EBDA2(ebda_seg, cdrom_locks[device], locks);
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regs->al = (locks ? 1 : 0);
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disk_ret(regs, DISK_RET_SUCCESS);
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}
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// status
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static void
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cdrom_134502(struct bregs *regs, u8 device)
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{
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u8 locks = GET_EBDA(cdrom_locks[device]);
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regs->al = (locks ? 1 : 0);
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disk_ret(regs, DISK_RET_SUCCESS);
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}
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static void
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cdrom_1345XX(struct bregs *regs, u8 device)
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{
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disk_ret(regs, DISK_RET_EPARAM);
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}
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// IBM/MS lock/unlock drive
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static void
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cdrom_1345(struct bregs *regs, u8 device)
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{
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switch (regs->al) {
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case 0x00: cdrom_134500(regs, device); break;
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case 0x01: cdrom_134501(regs, device); break;
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case 0x02: cdrom_134502(regs, device); break;
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default: cdrom_1345XX(regs, device); break;
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}
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}
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// IBM/MS eject media
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static void
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cdrom_1346(struct bregs *regs, u8 device)
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{
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u8 locks = GET_EBDA(cdrom_locks[device]);
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if (locks != 0) {
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disk_ret(regs, DISK_RET_ELOCKED);
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return;
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}
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// FIXME should handle 0x31 no media in device
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// FIXME should handle 0xb5 valid request failed
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// Call removable media eject
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struct bregs br;
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memset(&br, 0, sizeof(br));
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br.ah = 0x52;
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call16_int(0x15, &br);
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if (br.ah || br.flags & F_CF) {
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disk_ret(regs, DISK_RET_ELOCKED);
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return;
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}
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disk_ret(regs, DISK_RET_SUCCESS);
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}
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// IBM/MS extended media change
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static void
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cdrom_1349(struct bregs *regs, u8 device)
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{
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set_fail(regs);
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// always send changed ??
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regs->ah = DISK_RET_ECHANGED;
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}
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static void
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cdrom_ok(struct bregs *regs, u8 device)
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{
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disk_ret(regs, DISK_RET_SUCCESS);
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}
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static void
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cdrom_wp(struct bregs *regs, u8 device)
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{
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disk_ret(regs, DISK_RET_EWRITEPROTECT);
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}
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void
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cdrom_13(struct bregs *regs, u8 device)
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{
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//debug_stub(regs);
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switch (regs->ah) {
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case 0x15: cdrom_1315(regs, device); break;
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case 0x45: cdrom_1345(regs, device); break;
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case 0x46: cdrom_1346(regs, device); break;
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case 0x49: cdrom_1349(regs, device); break;
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// These functions are the same as for hard disks
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case 0x01:
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case 0x41:
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case 0x42:
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case 0x44:
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case 0x47:
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case 0x48:
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case 0x4e:
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disk_13(regs, device);
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break;
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// all these functions return SUCCESS
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case 0x00: // disk controller reset
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case 0x09: // initialize drive parameters
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case 0x0c: // seek to specified cylinder
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case 0x0d: // alternate disk reset
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case 0x10: // check drive ready
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case 0x11: // recalibrate
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case 0x14: // controller internal diagnostic
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case 0x16: // detect disk change
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cdrom_ok(regs, device);
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break;
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// all these functions return disk write-protected
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case 0x03: // write disk sectors
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case 0x05: // format disk track
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case 0x43: // IBM/MS extended write
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cdrom_wp(regs, device);
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break;
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default: disk_13XX(regs, device); break;
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}
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}
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/****************************************************************
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* CD emulation
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****************************************************************/
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// read disk drive parameters
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static void
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cdemu_1308(struct bregs *regs, u8 device)
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{
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u16 ebda_seg = get_ebda_seg();
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u16 nlc = GET_EBDA2(ebda_seg, cdemu.cylinders) - 1;
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u16 nlh = GET_EBDA2(ebda_seg, cdemu.heads) - 1;
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u16 nlspt = GET_EBDA2(ebda_seg, cdemu.spt);
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regs->al = 0x00;
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regs->bl = 0x00;
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regs->ch = nlc & 0xff;
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regs->cl = ((nlc >> 2) & 0xc0) | (nlspt & 0x3f);
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regs->dh = nlh;
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// FIXME ElTorito Various. should send the real count of drives 1 or 2
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// FIXME ElTorito Harddisk. should send the HD count
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regs->dl = 0x02;
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u8 media = GET_EBDA2(ebda_seg, cdemu.media);
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if (media <= 3)
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regs->bl = media * 2;
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regs->es = SEG_BIOS;
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regs->di = (u32)&diskette_param_table2;
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disk_ret(regs, DISK_RET_SUCCESS);
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}
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void
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cdemu_13(struct bregs *regs)
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{
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//debug_stub(regs);
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u16 ebda_seg = get_ebda_seg();
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u8 device = GET_EBDA2(ebda_seg, cdemu.controller_index) * 2;
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device += GET_EBDA2(ebda_seg, cdemu.device_spec);
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switch (regs->ah) {
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// These functions are the same as for hard disks
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case 0x02:
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case 0x04:
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disk_13(regs, device);
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break;
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// These functions are the same as standard CDROM.
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case 0x00:
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case 0x01:
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case 0x03:
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case 0x05:
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case 0x09:
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case 0x0c:
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case 0x0d:
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case 0x10:
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case 0x11:
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case 0x14:
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case 0x15:
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case 0x16:
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cdrom_13(regs, device);
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break;
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case 0x08: cdemu_1308(regs, device); break;
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default: disk_13XX(regs, device); break;
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}
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}
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struct eltorito_s {
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u8 size;
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u8 media;
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u8 emulated_drive;
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u8 controller_index;
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u32 ilba;
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u16 device_spec;
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u16 buffer_segment;
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u16 load_segment;
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u16 sector_count;
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u8 cylinders;
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u8 sectors;
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u8 heads;
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};
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#define SET_INT13ET(regs,var,val) \
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SET_FARVAR((regs)->ds, ((struct eltorito_s*)((regs)->si+0))->var, (val))
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// ElTorito - Terminate disk emu
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void
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cdemu_134b(struct bregs *regs)
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{
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// FIXME ElTorito Hardcoded
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u16 ebda_seg = get_ebda_seg();
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SET_INT13ET(regs, size, 0x13);
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SET_INT13ET(regs, media, GET_EBDA2(ebda_seg, cdemu.media));
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SET_INT13ET(regs, emulated_drive, GET_EBDA2(ebda_seg, cdemu.emulated_drive));
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SET_INT13ET(regs, controller_index
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, GET_EBDA2(ebda_seg, cdemu.controller_index));
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SET_INT13ET(regs, ilba, GET_EBDA2(ebda_seg, cdemu.ilba));
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SET_INT13ET(regs, device_spec, GET_EBDA2(ebda_seg, cdemu.device_spec));
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SET_INT13ET(regs, buffer_segment, GET_EBDA2(ebda_seg, cdemu.buffer_segment));
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SET_INT13ET(regs, load_segment, GET_EBDA2(ebda_seg, cdemu.load_segment));
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SET_INT13ET(regs, sector_count, GET_EBDA2(ebda_seg, cdemu.sector_count));
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SET_INT13ET(regs, cylinders, GET_EBDA2(ebda_seg, cdemu.cylinders));
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SET_INT13ET(regs, sectors, GET_EBDA2(ebda_seg, cdemu.spt));
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SET_INT13ET(regs, heads, GET_EBDA2(ebda_seg, cdemu.heads));
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// If we have to terminate emulation
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if (regs->al == 0x00) {
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// FIXME ElTorito Various. Should be handled accordingly to spec
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SET_EBDA2(ebda_seg, cdemu.active, 0x00); // bye bye
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}
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disk_ret(regs, DISK_RET_SUCCESS);
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}
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/****************************************************************
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* CD booting
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****************************************************************/
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// Request SENSE
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static int
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atapi_get_sense(u16 device, u8 *asc, u8 *ascq)
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{
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u8 buffer[18];
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u8 atacmd[12];
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memset(atacmd, 0, sizeof(atacmd));
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atacmd[0] = ATA_CMD_REQUEST_SENSE;
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atacmd[4] = sizeof(buffer);
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int ret = ata_cmd_packet(device, atacmd, sizeof(atacmd), sizeof(buffer)
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, MAKE_FARPTR(GET_SEG(SS), (u32)buffer));
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if (ret != 0)
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return ret;
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*asc = buffer[12];
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*ascq = buffer[13];
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return 0;
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}
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static int
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atapi_is_ready(u16 device)
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{
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if (GET_GLOBAL(ATA.devices[device].type) != ATA_TYPE_ATAPI) {
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printf("not implemented for non-ATAPI device\n");
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return -1;
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}
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dprintf(6, "ata_detect_medium: begin\n");
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u8 packet[12];
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memset(packet, 0, sizeof(packet));
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packet[0] = 0x25; /* READ CAPACITY */
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/* Retry READ CAPACITY 50 times unless MEDIUM NOT PRESENT
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* is reported by the device. If the device reports "IN PROGRESS",
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* 30 seconds is added. */
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u8 buf[8];
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u32 timeout = 5000;
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u32 time = 0;
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u8 in_progress = 0;
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for (;; time+=100) {
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if (time >= timeout) {
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dprintf(1, "read capacity failed\n");
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return -1;
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}
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int ret = ata_cmd_packet(device, packet, sizeof(packet), sizeof(buf)
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, MAKE_FARPTR(GET_SEG(SS), (u32)buf));
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if (ret == 0)
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break;
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u8 asc=0, ascq=0;
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ret = atapi_get_sense(device, &asc, &ascq);
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if (!ret)
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continue;
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if (asc == 0x3a) { /* MEDIUM NOT PRESENT */
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dprintf(1, "Device reports MEDIUM NOT PRESENT\n");
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return -1;
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}
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if (asc == 0x04 && ascq == 0x01 && !in_progress) {
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/* IN PROGRESS OF BECOMING READY */
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printf("Waiting for device to detect medium... ");
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/* Allow 30 seconds more */
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timeout = 30000;
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in_progress = 1;
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}
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}
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u32 block_len = (u32) buf[4] << 24
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| (u32) buf[5] << 16
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| (u32) buf[6] << 8
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| (u32) buf[7] << 0;
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if (block_len != GET_GLOBAL(ATA.devices[device].blksize)) {
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printf("Unsupported sector size %u\n", block_len);
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return -1;
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}
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u32 sectors = (u32) buf[0] << 24
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| (u32) buf[1] << 16
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| (u32) buf[2] << 8
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| (u32) buf[3] << 0;
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dprintf(6, "sectors=%u\n", sectors);
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printf("%dMB medium detected\n", sectors>>(20-11));
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return 0;
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}
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static int
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atapi_is_cdrom(u8 device)
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{
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if (device >= CONFIG_MAX_ATA_DEVICES)
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return 0;
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if (GET_GLOBAL(ATA.devices[device].type) != ATA_TYPE_ATAPI)
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return 0;
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if (GET_GLOBAL(ATA.devices[device].device) != ATA_DEVICE_CDROM)
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return 0;
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return 1;
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}
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// Compare a string on the stack to one in the code segment.
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static int
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streq_cs(u8 *s1, char *cs_s2)
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{
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u8 *s2 = (u8*)cs_s2;
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for (;;) {
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if (*s1 != GET_GLOBAL(*s2))
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return 0;
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if (! *s1)
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return 1;
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s1++;
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s2++;
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}
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}
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int
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cdrom_boot()
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{
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// Find out the first cdrom
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u8 device;
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for (device=0; device<CONFIG_MAX_ATA_DEVICES; device++)
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if (atapi_is_cdrom(device))
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break;
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if (device >= CONFIG_MAX_ATA_DEVICES)
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// cdrom not found
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return 2;
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int ret = atapi_is_ready(device);
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if (ret)
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dprintf(1, "atapi_is_ready returned %d\n", ret);
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// Read the Boot Record Volume Descriptor
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u8 buffer[2048];
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struct disk_op_s dop;
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dop.driveid = device;
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dop.lba = 0x11;
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dop.count = 1;
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dop.far_buffer = MAKE_FARPTR(GET_SEG(SS), (u32)buffer);
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ret = cdrom_read(&dop);
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if (ret)
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return 3;
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// Validity checks
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if (buffer[0])
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return 4;
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if (!streq_cs(&buffer[1], "CD001\001EL TORITO SPECIFICATION"))
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return 5;
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// ok, now we calculate the Boot catalog address
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u32 lba = *(u32*)&buffer[0x47];
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// And we read the Boot Catalog
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dop.lba = lba;
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ret = cdrom_read(&dop);
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if (ret)
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return 7;
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// Validation entry
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if (buffer[0x00] != 0x01)
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return 8; // Header
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if (buffer[0x01] != 0x00)
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return 9; // Platform
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if (buffer[0x1E] != 0x55)
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return 10; // key 1
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if (buffer[0x1F] != 0xAA)
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return 10; // key 2
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// Initial/Default Entry
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if (buffer[0x20] != 0x88)
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return 11; // Bootable
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u16 ebda_seg = get_ebda_seg();
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u8 media = buffer[0x21];
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SET_EBDA2(ebda_seg, cdemu.media, media);
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SET_EBDA2(ebda_seg, cdemu.controller_index, device/2);
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SET_EBDA2(ebda_seg, cdemu.device_spec, device%2);
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u16 boot_segment = *(u16*)&buffer[0x22];
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if (!boot_segment)
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boot_segment = 0x07C0;
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SET_EBDA2(ebda_seg, cdemu.load_segment, boot_segment);
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SET_EBDA2(ebda_seg, cdemu.buffer_segment, 0x0000);
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u16 nbsectors = *(u16*)&buffer[0x26];
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SET_EBDA2(ebda_seg, cdemu.sector_count, nbsectors);
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lba = *(u32*)&buffer[0x28];
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SET_EBDA2(ebda_seg, cdemu.ilba, lba);
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// And we read the image in memory
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dop.lba = lba * 4;
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dop.count = nbsectors;
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dop.far_buffer = MAKE_FARPTR(boot_segment, 0);
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ret = cdrom_read_512(&dop);
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if (ret)
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return 12;
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if (media == 0) {
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// No emulation requested - return success.
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// FIXME ElTorito Hardcoded. cdrom is hardcoded as device 0xE0.
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// Win2000 cd boot needs to know it booted from cd
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SET_EBDA2(ebda_seg, cdemu.emulated_drive, 0xE0);
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return 0;
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}
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// Emulation of a floppy/harddisk requested
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if (! CONFIG_CDROM_EMU)
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return 13;
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// Set emulated drive id and increase bios installed hardware
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// number of devices
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if (media < 4) {
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// Floppy emulation
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SET_EBDA2(ebda_seg, cdemu.emulated_drive, 0x00);
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SETBITS_BDA(equipment_list_flags, 0x41);
|
|
} else {
|
|
// Harddrive emulation
|
|
SET_EBDA2(ebda_seg, cdemu.emulated_drive, 0x80);
|
|
SET_BDA(hdcount, GET_BDA(hdcount) + 1);
|
|
}
|
|
|
|
// Remember the media type
|
|
switch (media) {
|
|
case 0x01: // 1.2M floppy
|
|
SET_EBDA2(ebda_seg, cdemu.spt, 15);
|
|
SET_EBDA2(ebda_seg, cdemu.cylinders, 80);
|
|
SET_EBDA2(ebda_seg, cdemu.heads, 2);
|
|
break;
|
|
case 0x02: // 1.44M floppy
|
|
SET_EBDA2(ebda_seg, cdemu.spt, 18);
|
|
SET_EBDA2(ebda_seg, cdemu.cylinders, 80);
|
|
SET_EBDA2(ebda_seg, cdemu.heads, 2);
|
|
break;
|
|
case 0x03: // 2.88M floppy
|
|
SET_EBDA2(ebda_seg, cdemu.spt, 36);
|
|
SET_EBDA2(ebda_seg, cdemu.cylinders, 80);
|
|
SET_EBDA2(ebda_seg, cdemu.heads, 2);
|
|
break;
|
|
case 0x04: { // Harddrive
|
|
u16 spt = GET_FARVAR(boot_segment,*(u8*)(446+6));
|
|
u16 cyl = (spt << 2) + GET_FARVAR(boot_segment,*(u8*)(446+7)) + 1;
|
|
u16 heads = GET_FARVAR(boot_segment,*(u8*)(446+5)) + 1;
|
|
SET_EBDA2(ebda_seg, cdemu.spt, spt & 0x3f);
|
|
SET_EBDA2(ebda_seg, cdemu.cylinders, cyl);
|
|
SET_EBDA2(ebda_seg, cdemu.heads, heads);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// everything is ok, so from now on, the emulation is active
|
|
SET_EBDA2(ebda_seg, cdemu.active, 0x01);
|
|
dprintf(6, "cdemu media=%d\n", media);
|
|
|
|
return 0;
|
|
}
|