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62058bfa32dfbd60bb82abffc832d40d4af2f849
Main/support/x86/x86.cpp
karllurman 62058bfa32 St and X86 moved to support
2018-11-01 11:15:58 +11:00

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/*
* Copyright (c) 2014, Aleksander Osman
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <stdbool.h>
#include <fcntl.h>
#include <time.h>
#include "../../spi.h"
#include "../../user_io.h"
#include "../../file_io.h"
#include "../../fpga_io.h"
#define ALT_CPU_CPU_FREQ 90000000u
#define FLOPPY0_BASE 0x8800
#define HDD0_BASE 0x8840
#define FLOPPY1_BASE 0x9800
#define HDD1_BASE 0x9840
#define PC_BUS_BASE 0x88a0
#define PIO_OUTPUT_BASE 0x8860
#define SOUND_BASE 0x9000
#define PIT_BASE 0x8880
#define RTC_BASE 0x8c00
#define SD_BASE 0x0A00
#define CFG_VER 2
typedef struct
{
uint32_t ver;
char fdd_name[1024];
char hdd0_name[1024];
char hdd1_name[1024];
} x86_config;
static x86_config config;
static uint8_t dma_sdio(int status)
{
uint8_t res;
EnableFpga();
spi8(UIO_DMA_SDIO);
res = spi_w((uint16_t)status);
DisableFpga();
return res;
}
static uint32_t dma_get(uint32_t address)
{
EnableFpga();
spi8(UIO_DMA_READ);
spi32w(address);
uint32_t res = spi32w(0);
DisableFpga();
return res;
}
static void dma_set(uint32_t address, uint32_t data)
{
EnableFpga();
spi8(UIO_DMA_WRITE);
spi32w(address);
spi32w(data);
DisableFpga();
}
static void dma_sendbuf(uint32_t address, uint32_t length, uint32_t *data)
{
EnableFpga();
spi8(UIO_DMA_WRITE);
spi32w(address);
while (length--) spi32w(*data++);
DisableFpga();
}
static void dma_rcvbuf(uint32_t address, uint32_t length, uint32_t *data)
{
EnableFpga();
spi8(UIO_DMA_READ);
spi32w(address);
while (length--) *data++ = spi32w(0);
DisableFpga();
}
static int load_bios(const char* name, uint8_t index)
{
fileTYPE f = { 0 };
static uint32_t buf[128];
if (!FileOpen(&f, name)) return 0;
unsigned long bytes2send = f.size;
printf("BIOS %s, %lu bytes.\n", name, bytes2send);
EnableFpga();
spi8(UIO_DMA_WRITE);
spi32w( index ? 0x80C0000 : 0x80F0000 );
while (bytes2send)
{
printf(".");
uint16_t chunk = (bytes2send>512) ? 512 : bytes2send;
bytes2send -= chunk;
FileReadSec(&f, buf);
chunk = (chunk + 3) >> 2;
uint32_t* p = buf;
while(chunk--) spi32w(*p++);
}
DisableFpga();
FileClose(&f);
printf("\n");
return 1;
}
static bool floppy_is_160k = false;
static bool floppy_is_180k = false;
static bool floppy_is_320k = false;
static bool floppy_is_360k = false;
static bool floppy_is_720k = false;
static bool floppy_is_1_2m = false;
static bool floppy_is_1_44m= false;
static bool floppy_is_1_68m= false;
static bool floppy_is_2_88m= false;
#define CMOS_FDD_TYPE ((floppy_is_2_88m) ? 0x50 : (floppy_is_1_44m || floppy_is_1_68m) ? 0x40 : (floppy_is_720k) ? 0x30 : (floppy_is_1_2m) ? 0x20 : 0x10)
static fileTYPE fdd_image0 = { 0 };
static fileTYPE fdd_image1 = { 0 };
static fileTYPE hdd_image0 = { 0 };
static fileTYPE hdd_image1 = { 0 };
static bool boot_from_floppy = 1;
#define IMG_TYPE_FDD0 0x0800
#define IMG_TYPE_FDD1 0x1800
#define IMG_TYPE_HDD0 0x0000
#define IMG_TYPE_HDD1 0x1000
static __inline fileTYPE *get_image(uint32_t type)
{
switch (type)
{
case IMG_TYPE_HDD0: return &hdd_image0;
case IMG_TYPE_HDD1: return &hdd_image1;
case IMG_TYPE_FDD0: return &fdd_image0;
}
return &fdd_image1;
}
static int img_mount(uint32_t type, char *name)
{
FileClose(get_image(type));
int writable = FileCanWrite(name);
int ret = FileOpenEx(get_image(type), name, writable ? (O_RDWR | O_SYNC) : O_RDONLY);
if (!ret)
{
get_image(type)->size = 0;
printf("Failed to open file %s\n", name);
return 0;
}
printf("Mount %s as %s\n", name, writable ? "read-write" : "read-only");
return 1;
}
static int img_read(uint32_t type, uint32_t lba, void *buf, uint32_t len)
{
if (!FileSeekLBA(get_image(type), lba)) return 0;
return FileReadAdv(get_image(type), buf, len);
}
static int img_write(uint32_t type, uint32_t lba, void *buf, uint32_t len)
{
if (!FileSeekLBA(get_image(type), lba)) return 0;
return FileWriteAdv(get_image(type), buf, len);
}
#define IOWR(base, reg, value) dma_set(base+(reg<<2), value)
static uint32_t cmos[128];
void cmos_set(int addr, uint8_t val)
{
if (addr >= sizeof(cmos)) return;
cmos[addr] = val;
return;
uint16_t sum = 0;
for (int i = 0x10; i <= 0x2D; i++) sum += cmos[i];
cmos[0x2E] = sum >> 8;
cmos[0x2F] = sum & 0xFF;
IOWR(RTC_BASE, addr, cmos[addr]);
IOWR(RTC_BASE, 0x2E, cmos[0x2E]);
IOWR(RTC_BASE, 0x2F, cmos[0x2F]);
}
static int fdd_set(char* filename)
{
floppy_is_160k = false;
floppy_is_180k = false;
floppy_is_320k = false;
floppy_is_360k = false;
floppy_is_720k = false;
floppy_is_1_2m = false;
floppy_is_1_44m = false;
floppy_is_1_68m = false;
floppy_is_2_88m = false;
int floppy = img_mount(IMG_TYPE_FDD0, filename);
uint32_t size = get_image(IMG_TYPE_FDD0)->size/512;
if (floppy && size)
{
if (size >= 5760) floppy_is_2_88m = true;
else if (size >= 3360) floppy_is_1_68m = true;
else if (size >= 2880) floppy_is_1_44m = true;
else if (size >= 2400) floppy_is_1_2m = true;
else if (size >= 1440) floppy_is_720k = true;
else if (size >= 720) floppy_is_360k = true;
else if (size >= 640) floppy_is_320k = true;
else if (size >= 360) floppy_is_180k = true;
else floppy_is_160k = true;
}
else
{
floppy = 0;
floppy_is_1_44m = true;
}
/*
0x00.[0]: media present
0x01.[0]: media writeprotect
0x02.[7:0]: media cylinders
0x03.[7:0]: media sectors per track
0x04.[31:0]: media total sector count
0x05.[1:0]: media heads
0x06.[31:0]: media sd base
0x07.[15:0]: media wait cycles: 200000 us / spt
0x08.[15:0]: media wait rate 0: 1000 us
0x09.[15:0]: media wait rate 1: 1666 us
0x0A.[15:0]: media wait rate 2: 2000 us
0x0B.[15:0]: media wait rate 3: 500 us
0x0C.[7:0]: media type: 8'h20 none; 8'h00 old; 8'hC0 720k; 8'h80 1_44M; 8'h40 2_88M
*/
int floppy_spt =
(floppy_is_160k) ? 8 :
(floppy_is_180k) ? 9 :
(floppy_is_320k) ? 8 :
(floppy_is_360k) ? 9 :
(floppy_is_720k) ? 9 :
(floppy_is_1_2m) ? 15 :
(floppy_is_1_44m) ? 18 :
(floppy_is_1_68m) ? 21 :
(floppy_is_2_88m) ? 36 :
0;
int floppy_cylinders = (floppy_is_2_88m || floppy_is_1_68m || floppy_is_1_44m || floppy_is_1_2m || floppy_is_720k) ? 80 : 40;
int floppy_heads = (floppy_is_160k || floppy_is_180k) ? 1 : 2;
int floppy_total_sectors = floppy_spt * floppy_heads * floppy_cylinders;
int floppy_wait_cycles = 200000000 / floppy_spt;
int floppy_media =
(!floppy) ? 0x20 :
(floppy_is_160k) ? 0x00 :
(floppy_is_180k) ? 0x00 :
(floppy_is_320k) ? 0x00 :
(floppy_is_360k) ? 0x00 :
(floppy_is_720k) ? 0xC0 :
(floppy_is_1_2m) ? 0x00 :
(floppy_is_1_44m) ? 0x80 :
(floppy_is_2_88m) ? 0x40 :
0x20;
IOWR(FLOPPY0_BASE, 0x0, floppy ? 1 : 0);
IOWR(FLOPPY0_BASE, 0x1, (floppy && (get_image(IMG_TYPE_FDD0)->mode & O_RDWR)) ? 0 : 1);
IOWR(FLOPPY0_BASE, 0x2, floppy_cylinders);
IOWR(FLOPPY0_BASE, 0x3, floppy_spt);
IOWR(FLOPPY0_BASE, 0x4, floppy_total_sectors);
IOWR(FLOPPY0_BASE, 0x5, floppy_heads);
IOWR(FLOPPY0_BASE, 0x6, 0); // base LBA
IOWR(FLOPPY0_BASE, 0x7, (int)(floppy_wait_cycles / (1000000000.0 / ALT_CPU_CPU_FREQ)));
IOWR(FLOPPY0_BASE, 0x8, (int)(1000000.0 / (1000000000.0 / ALT_CPU_CPU_FREQ)));
IOWR(FLOPPY0_BASE, 0x9, (int)(1666666.0 / (1000000000.0 / ALT_CPU_CPU_FREQ)));
IOWR(FLOPPY0_BASE, 0xA, (int)(2000000.0 / (1000000000.0 / ALT_CPU_CPU_FREQ)));
IOWR(FLOPPY0_BASE, 0xB, (int)(500000.0 / (1000000000.0 / ALT_CPU_CPU_FREQ)));
IOWR(FLOPPY0_BASE, 0xC, floppy_media);
//cmos_set(0x10, CMOS_FDD_TYPE);
return floppy;
}
typedef struct
{
uint32_t type;
uint32_t base;
uint32_t hd_cylinders;
uint32_t hd_heads;
uint32_t hd_spt;
uint32_t hd_total_sectors;
uint32_t present;
char* name;
} hdd_config;
static hdd_config hdd[2] = {
{ IMG_TYPE_HDD0, HDD0_BASE, 0, 0, 0, 0, 0, config.hdd0_name },
{ IMG_TYPE_HDD1, HDD1_BASE, 0, 0, 0, 0, 0, config.hdd1_name }
};
static int hdd_set(uint32_t num)
{
hdd[num].hd_cylinders = 0;
hdd[num].hd_heads = 0;
hdd[num].hd_spt = 0;
hdd[num].hd_total_sectors = 0;
hdd[num].present = img_mount(hdd[num].type, hdd[num].name);
if (!hdd[num].present) return 0;
hdd[num].hd_heads = 16;
hdd[num].hd_spt = 63;
hdd[num].hd_cylinders = get_image(hdd[num].type)->size / (hdd[num].hd_heads * hdd[num].hd_spt * 512);
//Maximum 8GB images are supported.
if (hdd[num].hd_cylinders > 16383) hdd[num].hd_cylinders = 16383;
hdd[num].hd_total_sectors = hdd[num].hd_spt*hdd[num].hd_heads*hdd[num].hd_cylinders;
/*
0x00.[31:0]: identify write
0x01.[16:0]: media cylinders
0x02.[4:0]: media heads
0x03.[8:0]: media spt
0x04.[13:0]: media sectors per cylinder = spt * heads
0x05.[31:0]: media sectors total
0x06.[31:0]: media sd base
*/
uint32_t identify[256] =
{
0x0040, //word 0
hdd[num].hd_cylinders, //word 1
0x0000, //word 2 reserved
hdd[num].hd_heads, //word 3
(uint16_t)(512 * hdd[num].hd_spt), //word 4
512, //word 5
hdd[num].hd_spt, //word 6
0x0000, //word 7 vendor specific
0x0000, //word 8 vendor specific
0x0000, //word 9 vendor specific
('A' << 8) | 'O', //word 10
('H' << 8) | 'D', //word 11
('0' << 8) | '0', //word 12
('0' << 8) | '0', //word 13
('0' << 8) | ' ', //word 14
(' ' << 8) | ' ', //word 15
(' ' << 8) | ' ', //word 16
(' ' << 8) | ' ', //word 17
(' ' << 8) | ' ', //word 18
(' ' << 8) | ' ', //word 19
3, //word 20 buffer type
512, //word 21 cache size
4, //word 22 number of ecc bytes
0,0,0,0, //words 23..26 firmware revision
(' ' << 8) | ' ', //words 27..46 model number
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
(' ' << 8) | ' ',
16, //word 47 max multiple sectors
1, //word 48 dword io
1 << 9, //word 49 lba supported
0x0000, //word 50 reserved
0x0200, //word 51 pio timing
0x0200, //word 52 pio timing
0x0007, //word 53 valid fields
hdd[num].hd_cylinders, //word 54
hdd[num].hd_heads, //word 55
hdd[num].hd_spt, //word 56
hdd[num].hd_total_sectors & 0xFFFF, //word 57
hdd[num].hd_total_sectors >> 16, //word 58
0x0000, //word 59 multiple sectors
hdd[num].hd_total_sectors & 0xFFFF, //word 60
hdd[num].hd_total_sectors >> 16, //word 61
0x0000, //word 62 single word dma modes
0x0000, //word 63 multiple word dma modes
0x0000, //word 64 pio modes
120,120,120,120, //word 65..68
0,0,0,0,0,0,0,0,0,0,0, //word 69..79
0x007E, //word 80 ata modes
0x0000, //word 81 minor version number
1 << 14, //word 82 supported commands
(1 << 14) | (1 << 13) | (1 << 12) | (1 << 10), //word 83
1 << 14, //word 84
1 << 14, //word 85
(1 << 14) | (1 << 13) | (1 << 12) | (1 << 10), //word 86
1 << 14, //word 87
0x0000, //word 88
0,0,0,0, //word 89..92
1 | (1 << 14) | 0x2000, //word 93
0,0,0,0,0,0, //word 94..99
hdd[num].hd_total_sectors & 0xFFFF, //word 100
hdd[num].hd_total_sectors >> 16, //word 101
0, //word 102
0, //word 103
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,//word 104..127
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, //word 128..255
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
if (hdd[num].present)
{
char *name = get_image(hdd[num].type)->name;
for (int i = 0; i < 20; i++)
{
if (*name) identify[27 + i] = ((*name++) << 8) | 0x20;
if (*name) identify[27 + i] = (identify[27 + i] & 0xFF00) | (*name++);
}
}
for (int i = 0; i<128; i++) IOWR(hdd[num].base, 0, hdd[num].present ? ((unsigned int)identify[2 * i + 1] << 16) | (unsigned int)identify[2 * i + 0] : 0);
IOWR(hdd[num].base, 1, hdd[num].hd_cylinders);
IOWR(hdd[num].base, 2, hdd[num].hd_heads);
IOWR(hdd[num].base, 3, hdd[num].hd_spt);
IOWR(hdd[num].base, 4, hdd[num].hd_spt * hdd[num].hd_heads);
IOWR(hdd[num].base, 5, hdd[num].hd_spt * hdd[num].hd_heads * hdd[num].hd_cylinders);
IOWR(hdd[num].base, 6, 0); // base LBA
printf("HDD%d:\n present %d\n hd_cylinders %d\n hd_heads %d\n hd_spt %d\n hd_total_sectors %d\n\n", num, hdd[num].present, hdd[num].hd_cylinders, hdd[num].hd_heads, hdd[num].hd_spt, hdd[num].hd_total_sectors);
return hdd[num].present;
}
static uint8_t bin2bcd(unsigned val)
{
return ((val / 10) << 4) + (val % 10);
}
void x86_init()
{
user_io_8bit_set_status(UIO_STATUS_RESET, UIO_STATUS_RESET);
load_bios("ao486/boot0.rom", 0);
load_bios("ao486/boot1.rom", 1);
IOWR(PC_BUS_BASE, 0, 0x00FFF0EA);
IOWR(PC_BUS_BASE, 1, 0x000000F0);
//-------------------------------------------------------------------------- sound
/*
0-255.[15:0]: cycles in period
256.[12:0]: cycles in 80us
257.[9:0]: cycles in 1 sample: 96000 Hz
*/
double cycle_in_ns = (1000000000.0 / ALT_CPU_CPU_FREQ); //33.333333;
for(int i=0; i<256; i++)
{
double f = 1000000.0 / (256.0-i);
double cycles_in_period = 1000000000.0 / (f * cycle_in_ns);
IOWR(SOUND_BASE, i, (int)cycles_in_period);
}
IOWR(SOUND_BASE, 256, (int)(80000.0 / (1000000000.0 / ALT_CPU_CPU_FREQ)));
IOWR(SOUND_BASE, 257, (int)((1000000000.0/96000.0) / (1000000000.0 / ALT_CPU_CPU_FREQ)));
//-------------------------------------------------------------------------- pit
/*
0.[7:0]: cycles in sysclock 1193181 Hz
*/
IOWR(PIT_BASE, 0, (int)((1000000000.0/1193181.0) / (1000000000.0 / ALT_CPU_CPU_FREQ)));
//-------------------------------------------------------------------------- floppy
fdd_set(config.fdd_name);
//-------------------------------------------------------------------------- hdd
hdd_set(0);
hdd_set(1);
//-------------------------------------------------------------------------- rtc
/*
128.[26:0]: cycles in second
129.[12:0]: cycles in 122.07031 us
*/
IOWR(RTC_BASE, 128, (int)(1000000000.0 / (1000000000.0 / ALT_CPU_CPU_FREQ)));
IOWR(RTC_BASE, 129, (int)(122070.0 / (1000000000.0 / ALT_CPU_CPU_FREQ)));
unsigned char translate_mode = 1; //LBA
translate_mode = (translate_mode << 6) | (translate_mode << 4) | (translate_mode << 2) | translate_mode;
time_t t = time(NULL);
struct tm tm = *localtime(&t);
//rtc contents 0-127
uint32_t tmp[128] = {
bin2bcd(tm.tm_sec), //0x00: SEC BCD
0x00, //0x01: ALARM SEC BCD
bin2bcd(tm.tm_min), //0x02: MIN BCD
0x00, //0x03: ALARM MIN BCD
bin2bcd(tm.tm_hour), //0x04: HOUR BCD 24h
0x12, //0x05: ALARM HOUR BCD 24h
(uint32_t)tm.tm_wday+1, //0x06: DAY OF WEEK Sunday=1
bin2bcd(tm.tm_mday), //0x07: DAY OF MONTH BCD from 1
bin2bcd(tm.tm_mon+1), //0x08: MONTH BCD from 1
bin2bcd((tm.tm_year<117) ? 17 : tm.tm_year-100), //0x09: YEAR BCD
0x26, //0x0A: REG A
0x02, //0x0B: REG B
0x00, //0x0C: REG C
0x80, //0x0D: REG D
0x00, //0x0E: REG E - POST status
0x00, //0x0F: REG F - shutdown status
(uint32_t)CMOS_FDD_TYPE, //0x10: floppy drive type; 0-none, 1-360K, 2-1.2M, 3-720K, 4-1.44M, 5-2.88M
0x00, //0x11: configuration bits; not used
0x00, //0x12: hard disk types; 0-none, 1:E-type, F-type 16+ (unused)
0x00, //0x13: advanced configuration bits; not used
0x0D, //0x14: equipment bits
0x80, //0x15: base memory in 1k LSB
0x02, //0x16: base memory in 1k MSB
0x00, //0x17: memory size above 1m in 1k LSB
0xFC, //0x18: memory size above 1m in 1k MSB
0x00, //0x19: extended hd types 1/2; type 47d (unused)
0x00, //0x1A: extended hd types 2/2 (unused)
//these hd parameters aren't used anymore
0x00, //0x1B: hd 0 configuration 1/9; cylinders low
0x00, //0x1C: hd 0 configuration 2/9; cylinders high
0x00, //0x1D: hd 0 configuration 3/9; heads
0x00, //0x1E: hd 0 configuration 4/9; write pre-comp low
0x00, //0x1F: hd 0 configuration 5/9; write pre-comp high
0x00, //0x20: hd 0 configuration 6/9; retries/bad map/heads>8
0x00, //0x21: hd 0 configuration 7/9; landing zone low
0x00, //0x22: hd 0 configuration 8/9; landing zone high
0x00, //0x23: hd 0 configuration 9/9; sectors/track
0x00, //0x24: hd 1 configuration 1/9; cylinders low
0x00, //0x25: hd 1 configuration 2/9; cylinders high
0x00, //0x26: hd 1 configuration 3/9; heads
0x00, //0x27: hd 1 configuration 4/9; write pre-comp low
0x00, //0x28: hd 1 configuration 5/9; write pre-comp high
0x00, //0x29: hd 1 configuration 6/9; retries/bad map/heads>8
0x00, //0x2A: hd 1 configuration 7/9; landing zone low
0x00, //0x2B: hd 1 configuration 8/9; landing zone high
0x00, //0x2C: hd 1 configuration 9/9; sectors/track
(boot_from_floppy)? 0x20u : 0x00u, //0x2D: boot sequence
0x00, //0x2E: checksum MSB
0x00, //0x2F: checksum LSB
0x00, //0x30: memory size above 1m in 1k LSB
0xFC, //0x31: memory size above 1m in 1k MSB
0x20, //0x32: IBM century
0x00, //0x33: ?
0x00, //0x34: memory size above 16m in 64k LSB
0x07, //0x35: memory size above 16m in 64k MSB; 128 MB
0x00, //0x36: ?
0x20, //0x37: IBM PS/2 century
0x00, //0x38: eltorito boot sequence; not used
translate_mode, //0x39: ata translation policy 1-4
0x00, //0x3A: ata translation policy 5-8
0x00, //0x3B: ?
0x00, //0x3C: ?
0x00, //0x3D: eltorito boot sequence; not used
0x00, //0x3E: ?
0x00, //0x3F: ?
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
memcpy(cmos, tmp, sizeof(cmos));
//count checksum
unsigned short sum = 0;
for(int i=0x10; i<=0x2D; i++) sum += cmos[i];
cmos[0x2E] = sum >> 8;
cmos[0x2F] = sum & 0xFF;
for(unsigned int i=0; i<sizeof(cmos)/sizeof(unsigned int); i++) IOWR(RTC_BASE, i, cmos[i]);
user_io_8bit_set_status(0, UIO_STATUS_RESET);
}
struct sd_param_t
{
uint32_t addr;
uint32_t lba;
uint32_t bl_cnt;
};
static struct sd_param_t sd_params = { 0 };
void x86_poll()
{
int res = 0;
static uint32_t secbuf[128 * 4];
char sd_req = dma_sdio(0);
if (sd_req == 1)
{
dma_rcvbuf(SD_BASE + (4 << 2), sizeof(sd_params) >> 2, (uint32_t*)&sd_params);
//printf("Read: 0x%08x, 0x%08x, %d\n", sd_params.addr, sd_params.lba, sd_params.bl_cnt);
if (get_image(sd_params.addr)->size)
{
if (sd_params.bl_cnt>0 && sd_params.bl_cnt<=4)
{
if (img_read(sd_params.addr, sd_params.lba, secbuf, sd_params.bl_cnt * 512))
{
dma_sendbuf(sd_params.addr, sd_params.bl_cnt * 128, secbuf);
res = 1;
}
}
else
{
printf("Error: Block count %d is out of range 1..4.\n", sd_params.bl_cnt);
}
}
else
{
printf("Error: image is not ready.\n");
}
dma_sdio(res ? 1 : 2);
}
else if (sd_req == 2)
{
dma_rcvbuf(SD_BASE + (4 << 2), sizeof(sd_params) >> 2, (uint32_t*)&sd_params);
//printf("Write: 0x%08x, 0x%08x, %d\n", sd_params.addr, sd_params.lba, sd_params.bl_cnt);
if (get_image(sd_params.addr)->size)
{
if (sd_params.bl_cnt>0 && sd_params.bl_cnt <= 4)
{
if (get_image(sd_params.addr)->mode & O_RDWR)
{
dma_rcvbuf(sd_params.addr, sd_params.bl_cnt * 128, secbuf);
if (img_write(sd_params.addr, sd_params.lba, secbuf, sd_params.bl_cnt * 512))
{
res = 1;
}
}
else
{
printf("Error: image is read-only.\n");
}
}
else
{
printf("Error: Block count %d is out of range 1..4.\n", sd_params.bl_cnt);
}
}
else
{
printf("Error: image is not ready.\n");
}
dma_sdio(res ? 1 : 2);
}
}
void x86_set_image(int num, char *filename)
{
switch (num)
{
case 0:
strcpy(config.fdd_name, filename);
fdd_set(filename);
break;
case 2:
strcpy(config.hdd0_name, filename);
break;
case 3:
strcpy(config.hdd1_name, filename);
break;
}
}
void x86_config_save()
{
config.ver = CFG_VER;
FileSaveConfig("ao486sys.cfg", &config, sizeof(config));
}
void x86_config_load()
{
static x86_config tmp;
memset(&config, 0, sizeof(config));
if (FileLoadConfig("ao486sys.cfg", &tmp, sizeof(tmp)) && (tmp.ver == CFG_VER))
{
memcpy(&config, &tmp, sizeof(config));
}
}
void x86_set_fdd_boot(uint32_t boot)
{
boot_from_floppy = (boot != 0);
}
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