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3 <head>
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25 <body>
41 writed by ZeXx86<br>
46 <br>
51 </span>
67 <br>
90 <br>
95 </span>
101 <br>
111 <br>
115 </span>
116 In <a href="http://en.wikipedia.org/wiki/Computing" title="Computing">computing</a>, a <b>system call</b> is the mechanism used by an application program to request service from the <a href="http://en.wikipedia.org/wiki/Operating_system" title="Operating system">operating system</a>.<br>
121 ZeX/OS uses this implementation on <a href="http://en.wikipedia.org/wiki/X86" title="X86">x86</a> where the system call number is placed in the EAX <a href="http://en.wikipedia.org/wiki/Processor_register" title="Processor register">register</a> before interrupt 0x80 is executed.<br>
125
126 <table style="text-align: left; width: 883px; height: 247px;" border="1" cellpadding="2" cellspacing="2">
131 <tbody>
136 <tr>
141 <td style="text-align: center; background-color: rgb(51, 204, 255); font-weight: bold; font-style: italic;" valign="undefined">Name</td>
146 <td style="background-color: rgb(51, 204, 255); text-align: center; font-weight: bold; font-style: italic;" valign="undefined">Description</td>
151 <td style="text-align: center; font-weight: bold; font-style: italic; background-color: rgb(51, 255, 255);" valign="undefined">%eax</td>
156 <td style="text-align: center; font-weight: bold; font-style: italic; background-color: rgb(51, 255, 255);" valign="undefined">%ebx</td>
161 <td style="text-align: center; font-weight: bold; font-style: italic; background-color: rgb(51, 255, 255);" valign="undefined">%ecx</td>
166 <td style="text-align: center; font-weight: bold; font-style: italic; background-color: rgb(51, 255, 255);" valign="undefined">%edx</td>
171 <td style="font-weight: bold; font-style: italic; text-align: center; background-color: rgb(51, 255, 255);" valign="undefined">$0x9000</td>
176 </tr>
181 <tr>
221 </tr>
226 <tr>
266 </tr>
271 <tr>
311 </tr>
316 <tr>
356 </tr>
361 <tr>
401 </tr>
406 <tr>
446 </tr>
451 <tr>
491 </tr>
496 <tr>
536 </tr>
545 </tbody>
546 </table>
551 </div>
560 <span style="font-weight: bold;">2. Assembler tutorial <br>
564 </span><br>
568 <span style="font-weight: normal;">For people interested in assembler programming for ZeX/OS is small example of source code for <span style="font-style: italic;">nasm</span> </span><span style="font-weight: normal;">compiler.</span><span style="font-weight: bold;"></span><br>
576 <span style="font-weight: bold;"></span></span><span style="font-style: italic;">>File start.asm<<br>
580 </span>
581 <table style="text-align: left; background-color: rgb(234, 234, 234); width: 521px; height: 544px;" border="0" cellpadding="2" cellspacing="2">
585 <tbody>
589 <tr>
594 ; first, we need tell to compiler, that we
603 _start: ; define of _start function<br>
607 jmp main ; jump to main function<br>
611 <br>
615 <br>
619 cls:
620 ;
621 clear screen function<br>
625 mov eax, 6 ; system call number 6<br>
630 ; call interrupt for system call
636
641 <br>
645 putch:
646 ; print
647 chatacter on the screen<br>
651 mov ebx, '.' ; we want print character '.'<br>
655 mov eax, 4 ; this is system call number 6<br>
665
670 <br>
674 <br>
678 main: ; main function<br>
687 <br>
691 mov cl, 10 ; set number 10 to register cl<br>
695 nav:<br>
700 ; decrease one number from
701 register cl<br>
705 call putch ; print charecter '.' on the screen<br>
710 ; will be jump to nav until
711 cl is'nt zero<br>
715 <br>
720
725 </td>
729 </tr>
736 </tbody>
737 </table>
741 <br>
745 For compile, you need <span style="font-style: italic;">nasm</span> compiler and <span style="font-style: italic;">ld</span> for link object.<br>
749 nasm -f elf -ostart.o start.asm<br>
753 ld -m elf_i386 -s -omyapp start.o<br>
757 <span style="font-style: italic;"></span><span style="font-weight: bold;"><span style="font-weight: bold;"></span></span><br>
761 <br>
769 <br>
773 <span style="font-weight: bold;"><span style="font-weight: bold;"></span></span></span><span style="font-weight: normal;">For people interested in C programming language for ZeX/OS is small example of source code for </span><span style="font-style: italic; font-weight: normal;">gcc</span><span style="font-weight: normal;"> compiler.<br>
781 </span><span style="font-style: italic;">>File main.c<</span><span style="font-style: italic;"><br>
785 </span>
786 <table style="text-align: left; background-color: rgb(234, 234, 234); height: 237px; width: 381px;" border="0" cellpadding="2" cellspacing="2">
790 <tbody>
794 <tr>
802 <br>
806 int main ()<br>
810 {<br>
822 <br>
838 <br>
846 <br>
854 }<br>
858 </td>
862 </tr>
869 </tbody>
870 </table>
873 <br>
876 <br>
879 <br>
885 <br>
889 commonly known as glibc, is the C standard library released by the GNU
890 Project. Originally written by the Free Software Foundation (FSF) for
891 the GNU operating system, the library's development has been overseen
892 by a committee since 2001, with Ulrich Drepper as the lead contributor
893 and maintainer.<br>
896 <br>
899 This version of glibc is completly written by <span style="font-style: italic;">ZeXx86</span> for light compatibility with GNU programs written in C programming languague on ZeX/OS.<br>
902 <br>
908 <br>
914 <table style="text-align: left; background-color: rgb(234, 234, 234); width: 608px; height: 164px;" border="0" cellpadding="2" cellspacing="2">
917 <tbody>
920 <tr>
923 <td>
926 <div style="text-align: left;">void putch (char c); // Print a character on the screen </div>
929 void puts (unsigned char *text); // Print a string<br>
932 void printf (const char *fmt, ...); // Same as puts but with arguments<br>
935 void cls (); // Clear a screen<br>
938 unsigned char getch (); // Get a pressed character<br>
941 unsigned char getkey (); // Get a keycode<br>
944 void gotoxy (int x, int y); // Move a cursor to another place<br>
947 void setcolor (int t, int f); // Set color to next text<br>
949 int sprintf(char *buffer, const char *fmt, ...); // Copy string fmt with args to buffer
950 </td>
954 </tr>
961 </tbody>
962 </table>
965 <br>
971 <table style="text-align: left; background-color: rgb(234, 234, 234); width: 608px; height: 88px;" border="0" cellpadding="2" cellspacing="2">
974 <tbody>
977 <tr>
983 void *realloc (void *blk, size_t size); // Allocate next block of memory<br>
986 void free (void *blk); // Free a block of allocated memory<br>
989 void exit (); // Exit app at call point
990 </td>
994 </tr>
1001 </tbody>
1002 </table>
1005 <br>
1011 <table style="text-align: left; background-color: rgb(234, 234, 234); width: 607px; height: 31px;" border="0" cellpadding="2" cellspacing="2">
1014 <tbody>
1017 <tr>
1020 <td>unsigned int sleep (unsigned int) // Wait until time (in sec) pass
1021 </td>
1025 </tr>
1032 </tbody>
1033 </table>
1036 <br>
1042 <table style="text-align: left; background-color: rgb(234, 234, 234); width: 756px; height: 164px;" border="0" cellpadding="2" cellspacing="2">
1045 <tbody>
1048 <tr>
1051 <td>void *memcpy (void *dst_ptr, const void *src_ptr, size_t count); // Copy block of memory<br>
1054 void *memsetw (void *dst, int val, size_t count); // Put to memory block of some character<br>
1057 void *memset (void *dst, int val, size_t count); // Put to memory block of some character<br>
1060 size_t strlen (const char *str); // Get length of string<br>
1063 char *strcpy (char *to, const char *from); // Copy string<br>
1065 char *strncpy (char *s1, const char *s2, size_t n); // Copy string with declared length<br>
1068 char *strcat (char *s, const char *add); // Add string to another string<br>
1071 int strcmp (const char *cs, const char *ct); // Compare two strings<br>
1074 int strncmp (const char *cs, const char *ct, size_t count); // Compare two strings with defined length<br>
1076 char *strdup (const char *s); // Alloc new block of memory for string s<br>
1080 </td>
1084 </tr>
1091 </tbody>
1092 </table>
1095 <br>
1101 <table style="text-align: left; background-color: rgb(234, 234, 234); width: 403px; height: 126px;" border="0" cellpadding="2" cellspacing="2">
1104 <tbody>
1107 <tr>
1113 void outportb (unsigned port, unsigned val); // Set byte on port<br>
1116 unsigned disable (void); // Disable interrupts<br>
1119 void enable (void); // Enable interrupts<br>
1122 void enable_irq (unsigned short irq_num); // Enable irq<br>
1125 void disable_irq (unsigned short irq_num); // Disable irq
1126 </td>
1130 </tr>
1137 </tbody>
1138 </table>
1139 <br>
1140 <br>
1141 <span style="font-weight: bold;">5. </span><span style="font-weight: bold;">Filesystem driver tutorial<br>
1142 <br>
1143 </span>ZeX/OS is developed for no one filesystem, so it supports fs handlers, disk handlers, etc..<br>
1144 As you should see, in this short tutorial, you will learn how it works<br>
1145 <br>
1146 <br>
1150 <table style="text-align: left; background-color: rgb(234, 234, 234); width: 593px; height: 126px;" border="0" cellpadding="2" cellspacing="2">
1153 <tbody>
1156 <tr>
1161 classical char * for getting data after calling */<br>
1162 int lba28_drive_read (partition_t *p, unsigned int addr, unsigned char *buffer);<br>
1163 <br>
1164 /* same, but for writing data from buffer */<br>
1165 int lba28_drive_write (partition_t *p, unsigned char addr, unsigned char *buffer);<br>
1166 <br>
1167 /* when you want device metod, use this */<br>
1168 dev_t *dev = dev_findbypartition (p);<br>
1169 <br>
1170 if (!dev) // check for existing device<br>
1172 <br>
1175 <br>
1176 /* handler is defined in drive.c and function shows like this */<br>
1177 bool ide_acthandler (unsigned act, partition_t *p, char *block, char *more, int n)<br>
1179 </td>
1183 </tr>
1190 </tbody>
1191 </table>
1192 <br>
1193 <br>
1197 <table style="text-align: left; background-color: rgb(234, 234, 234); width: 687px; height: 1057px;" border="0" cellpadding="2" cellspacing="2">
1200 <tbody>
1203 <tr>
1211 <br>
1212 <br>
1213 bool myfs_read_dir (partition_t *p, char *block, int n)<br>
1214 {<br>
1215 /* its your space for create
1216 function, which read directory and put it to dir[] structure, <br>
1217 dir is defined in system.h include */<br>
1219 }<br>
1220 <br>
1221 /*<br>
1223 */<br>
1224 <br>
1225 /** MyFS handler for handling disk operations<br>
1229 bool myfs_handler (unsigned act, unsigned arg, char *block, unsigned n, unsigned long l)<br>
1230 {<br>
1234 /* something, what you need to initialize, e.g. memory stacks */<br>
1241 case FS_ARG_FILE:<br>
1243
1244 myfs_read_file (curr_part, n); //
1245 this have to read file at n block on partition_t *curr_part<br>
1246 /* ... some stuff for get new data on char *block */<br>
1247 return 1;<br>
1250 case FS_ARG_DIR:<br>
1252
1253 myfs_read_dir (curr_part, n); //
1254 this is your new fs function too<br>
1255 /* same as in file operation */<br>
1256 return 1;<br>
1260 <br>
1266 /* Yeah, you
1267 want to probably create FS with write support, you can do it here */<br>
1271 <br>
1273 }<br>
1275 </td>
1279 </tr>
1286 </tbody>
1287 </table>
1289 <br>
1290 <span style="font-weight: bold;"> </span><span style="font-weight: bold;"></span></div>
1296 </div>
1301 </body>
1302 </html>