308 lines
8.0 KiB
C++
308 lines
8.0 KiB
C++
// Copyright (C) 2001 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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typedef enum _sense {
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SENSE_NONE = 0, SENSE_NOT_READY = 2, SENSE_ILLEGAL_REQUEST = 5
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} sense_t;
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typedef enum _asc {
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ASC_INV_FIELD_IN_CMD_PACKET = 0x24,
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ASC_MEDIUM_NOT_PRESENT = 0x3a,
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ASC_SAVING_PARAMETERS_NOT_SUPPORTED = 0x39,
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ASC_LOGICAL_BLOCK_OOR = 0x21
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} asc_t;
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class LOWLEVEL_CDROM;
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class device_image_t
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{
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public:
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// Open a image. Returns non-negative if successful.
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virtual int open (const char* pathname) = 0;
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// Close the image.
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virtual void close () = 0;
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// Position ourselves. Return the resulting offset from the
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// beginning of the file.
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virtual off_t lseek (off_t offset, int whence) = 0;
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// Read count bytes to the buffer buf. Return the number of
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// bytes read (count).
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virtual ssize_t read (void* buf, size_t count) = 0;
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// Write count bytes from buf. Return the number of bytes
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// written (count).
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virtual ssize_t write (const void* buf, size_t count) = 0;
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unsigned cylinders;
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unsigned heads;
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unsigned sectors;
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};
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class default_image_t : public device_image_t
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{
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public:
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// Open a image. Returns non-negative if successful.
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int open (const char* pathname);
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// Close the image.
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void close ();
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// Position ourselves. Return the resulting offset from the
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// beginning of the file.
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off_t lseek (off_t offset, int whence);
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// Read count bytes to the buffer buf. Return the number of
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// bytes read (count).
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ssize_t read (void* buf, size_t count);
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// Write count bytes from buf. Return the number of bytes
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// written (count).
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ssize_t write (const void* buf, size_t count);
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private:
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int fd;
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};
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#if BX_SPLIT_HD_SUPPORT
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class concat_image_t : public device_image_t
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{
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public:
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// Open a image. Returns non-negative if successful.
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int open (const char* pathname);
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// Close the image.
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void close ();
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// Position ourselves. Return the resulting offset from the
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// beginning of the file.
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off_t lseek (off_t offset, int whence);
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// Read count bytes to the buffer buf. Return the number of
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// bytes read (count).
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ssize_t read (void* buf, size_t count);
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// Write count bytes from buf. Return the number of bytes
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// written (count).
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ssize_t write (const void* buf, size_t count);
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private:
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#define BX_CONCAT_MAX_IMAGES 8
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int fd_table[BX_CONCAT_MAX_IMAGES];
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ssize_t start_offset_table[BX_CONCAT_MAX_IMAGES];
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ssize_t length_table[BX_CONCAT_MAX_IMAGES];
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void increment_string (char *str);
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int maxfd; // number of entries in tables that are valid
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// notice if anyone does sequential read or write without seek in between.
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// This can be supported pretty easily, but needs additional checks.
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// 0=something other than seek was last operation
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// 1=seek was last operation
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int seek_was_last_op;
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// the following variables tell which partial image file to use for
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// the next read and write.
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int index; // index into table
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int fd; // fd to use for reads and writes
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int thismin, thismax; // byte offset boundary of this image
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};
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#endif /* BX_SPLIT_HD_SUPPORT */
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#if EXTERNAL_DISK_SIMULATOR
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#include "external-disk-simulator.h"
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#endif
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typedef struct {
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struct {
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Boolean busy;
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Boolean drive_ready;
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Boolean write_fault;
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Boolean seek_complete;
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Boolean drq;
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Boolean corrected_data;
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Boolean index_pulse;
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unsigned index_pulse_count;
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Boolean err;
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} status;
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Bit8u error_register;
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// Bit8u drive_select; this field was moved :^(
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Bit8u head_no;
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union {
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Bit8u sector_count;
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struct {
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#ifdef BX_LITTLE_ENDIAN
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unsigned c_d : 1;
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unsigned i_o : 1;
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unsigned rel : 1;
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unsigned tag : 5;
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#else /* BX_BIG_ENDIAN */
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unsigned tag : 5;
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unsigned rel : 1;
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unsigned i_o : 1;
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unsigned c_d : 1;
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#endif
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} interrupt_reason;
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};
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Bit8u sector_no;
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union {
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Bit16u cylinder_no;
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Bit16u byte_count;
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};
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Bit8u buffer[2048];
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unsigned buffer_index;
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Bit8u current_command;
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Bit8u sectors_per_block;
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Bit8u lba_mode;
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struct {
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Boolean reset; // 0=normal, 1=reset controller
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Boolean disable_irq; // 0=allow irq, 1=disable irq
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} control;
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Bit8u reset_in_progress;
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Bit8u features;
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} controller_t;
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struct sense_info_t {
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sense_t sense_key;
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struct {
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Bit8u arr[4];
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} information;
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struct {
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Bit8u arr[4];
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} specific_inf;
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struct {
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Bit8u arr[3];
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} key_spec;
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Bit8u fruc;
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Bit8u asc;
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Bit8u ascq;
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};
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struct error_recovery_t {
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unsigned char data[8];
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error_recovery_t ();
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};
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uint16 read_16bit(const uint8* buf);
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uint32 read_32bit(const uint8* buf);
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#ifdef LOWLEVEL_CDROM
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# include "cdrom.h"
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#endif
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struct cdrom_t
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{
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Boolean ready;
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Boolean locked;
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#ifdef LOWLEVEL_CDROM
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LOWLEVEL_CDROM* cd;
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#endif
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uint32 capacity;
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int next_lba;
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int remaining_blocks;
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struct currentStruct {
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error_recovery_t error_recovery;
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} current;
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};
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struct atapi_t
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{
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uint8 command;
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int drq_bytes;
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int total_bytes_remaining;
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};
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#if BX_USE_HD_SMF
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# define BX_HD_SMF static
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# define BX_HD_THIS bx_hard_drive.
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#else
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# define BX_HD_SMF
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# define BX_HD_THIS this->
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#endif
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#define BX_SELECTED_HD BX_HD_THIS s[BX_HD_THIS drive_select]
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#define CDROM_SELECTED (BX_HD_THIS s[BX_HD_THIS drive_select].device_type == IDE_CDROM)
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#define DEVICE_TYPE_STRING ((CDROM_SELECTED) ? "CD-ROM" : "DISK")
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typedef enum {
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IDE_DISK, IDE_CDROM
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} device_type_t;
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class bx_hard_drive_c : public logfunctions {
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public:
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bx_hard_drive_c(void);
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~bx_hard_drive_c(void);
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BX_HD_SMF void close_harddrive(void);
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BX_HD_SMF void init(bx_devices_c *d, bx_cmos_c *cmos);
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#if !BX_USE_HD_SMF
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Bit32u read(Bit32u address, unsigned io_len);
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void write(Bit32u address, Bit32u value, unsigned io_len);
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#endif
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static Bit32u read_handler(void *this_ptr, Bit32u address, unsigned io_len);
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static void write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len);
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private:
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BX_HD_SMF Bit32u calculate_logical_address();
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BX_HD_SMF void increment_address();
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BX_HD_SMF void identify_drive(unsigned drive);
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BX_HD_SMF void identify_ATAPI_drive(unsigned drive);
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BX_HD_SMF void command_aborted(unsigned command);
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BX_HD_SMF void init_send_atapi_command(Bit8u command, int req_length, int alloc_length, bool lazy = false);
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BX_HD_SMF void ready_to_send_atapi();
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BX_HD_SMF void raise_interrupt();
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BX_HD_SMF void atapi_cmd_error(sense_t sense_key, asc_t asc);
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BX_HD_SMF void init_mode_sense_single(const void* src, int size);
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BX_HD_SMF void atapi_cmd_nop();
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struct sStruct {
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device_image_t* hard_drive;
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device_type_t device_type;
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// 512 byte buffer for ID drive command
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// These words are stored in native word endian format, as
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// they are fetched and returned via a return(), so
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// there's no need to keep them in x86 endian format.
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Bit16u id_drive[256];
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controller_t controller;
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cdrom_t cdrom;
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sense_info_t sense;
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atapi_t atapi;
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} s[2];
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unsigned drive_select;
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bx_devices_c *devices;
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};
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extern bx_hard_drive_c bx_hard_drive;
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