166 lines
2.5 KiB
C
166 lines
2.5 KiB
C
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#include "../io/vx_io.h"
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#include "../fileio/fileio.h"
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#include <sys/stat.h>
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#include <errno.h>
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#include <stdio.h>
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#define CLOSE 1
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#define ISATTY 2
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#define LSEEK 3
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#define READ 4
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#define WRITE 5
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#define FSTAT 6
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#define FILE_IO_WRITE 0x71000000
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#define FILE_IO_READ 0x72000000
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void upload(char ** ptr, char * src, int size)
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{
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char * drain = *ptr;
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*drain = size;
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drain += 4;
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for (int i = 0; i < size; i++)
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{
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(*drain) = src[i];
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drain += 1;
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}
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*ptr = drain;
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}
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void download(char ** ptr, char * drain)
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{
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char * src = *ptr;
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int size;
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size = *((int *) src);
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src += 4;
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for (int i = 0; i < size; i++)
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{
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drain[i] = (*src);
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src += 1;
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}
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*ptr = src;
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}
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void _close()
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{
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vx_print_str("Hello from _close\n");
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}
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int _fstat(int file, struct stat * st)
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{
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char * write_buffer = (char *) FILE_IO_WRITE;
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int cmd_id = FSTAT;
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upload((char **) &write_buffer, (char *) &cmd_id, sizeof(int));
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upload((char **) &write_buffer, (char *) &file , sizeof(int));
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vx_fstat();
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char * read_buffer = (char *) FILE_IO_READ;
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download((char **) &read_buffer, (char *) st);
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}
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int _isatty (int file)
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{
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vx_print_str("Hello from _isatty\n");
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return 1;
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}
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void _lseek()
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{
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vx_print_str("Hello from _lseek\n");
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}
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void _read()
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{
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vx_print_str("Hello from _read\n");
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}
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int _write (int file, char *buf, int nbytes)
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{
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char * write_buffer = (char *) FILE_IO_WRITE;
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int cmd_id = WRITE;
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upload((char **) &write_buffer, (char *) &cmd_id, sizeof(int));
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upload((char **) &write_buffer, (char *) &file , sizeof(int));
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upload((char **) &write_buffer, (char *) buf , nbytes);
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vx_write();
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// int i;
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// unsigned int volatile * const print_addr = (unsigned int *) 0x00010000;
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// for (i = 0; i < nbytes; i++)
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// {
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// (*print_addr) = buf[i];
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// }
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// return nbytes;
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}
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static int heap_start = (int) 0x10000000;
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static int head_end = (int) 0x20000000;
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void * _sbrk (int nbytes)
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{
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//vx_print_str("Hello from _sbrk\n");
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//vx_printf("nbytes: ", nbytes);
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//if (nbytes < 0) vx_print_str("nbytes less than zero\n");
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// printf("nBytes: %d\n", nbytes);
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if (nbytes < 0)
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{
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nbytes = nbytes * -1;
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}
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if (nbytes > 10240)
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{
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nbytes = 10240;
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}
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// if (((unsigned) head_end) > ((unsigned) (heap_ptr + nbytes)))
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if (true)
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{
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int base = heap_start;
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heap_start += nbytes;
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//vx_print_str("_sbrk returning: ");
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//vx_print_hex((unsigned) base);
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//vx_print_str("\n");
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return (void *) base;
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}
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else
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{
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errno = ENOMEM;
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return (void *) -1;
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}
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} /* _sbrk () */
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