88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
|
/* cygmon.c -- Glue code for linking apps to run on top of Cygmon.
|
||
|
|
*
|
||
|
|
* Copyright (c) 1998, 1999, 2000 Red Hat, Inc.
|
||
|
|
*
|
||
|
|
* The authors hereby grant permission to use, copy, modify, distribute,
|
||
|
|
* and license this software and its documentation for any purpose, provided
|
||
|
|
* that existing copyright notices are retained in all copies and that this
|
||
|
|
* notice is included verbatim in any distributions. No written agreement,
|
||
|
|
* license, or royalty fee is required for any of the authorized uses.
|
||
|
|
* Modifications to this software may be copyrighted by their authors
|
||
|
|
* and need not follow the licensing terms described here, provided that
|
||
|
|
* the new terms are clearly indicated on the first page of each file where
|
||
|
|
* they apply.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "syscall.h"
|
||
|
|
|
||
|
|
int
|
||
|
|
write ( int file,
|
||
|
|
char *buf,
|
||
|
|
int nbytes)
|
||
|
|
{
|
||
|
|
return sysCall(SYS_write, file, (unsigned long)buf, nbytes);
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
read (int file,
|
||
|
|
char *buf,
|
||
|
|
int nbytes)
|
||
|
|
{
|
||
|
|
return sysCall(SYS_read, file, (unsigned long)buf, nbytes);
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
outbyte (unsigned char c)
|
||
|
|
{
|
||
|
|
return sysCall(SYS_write, 0, (unsigned long)&c, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned char
|
||
|
|
inbyte (void)
|
||
|
|
{
|
||
|
|
char c;
|
||
|
|
sysCall(SYS_read, 0, (unsigned long)&c, 1);
|
||
|
|
return c;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Structure filled in by get_mem_info. Only the size field is
|
||
|
|
actually used (by sbrk), so the others aren't even filled in. */
|
||
|
|
struct s_mem
|
||
|
|
{
|
||
|
|
unsigned int size;
|
||
|
|
unsigned int icsize;
|
||
|
|
unsigned int dcsize;
|
||
|
|
};
|
||
|
|
|
||
|
|
// Perform a system call.
|
||
|
|
// Unused parameters should be set to 0.
|
||
|
|
int sysCall(unsigned long func, unsigned long p1, unsigned long p2, unsigned long p3)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
asm volatile ( "
|
||
|
|
move $4, %1
|
||
|
|
move $5, %2
|
||
|
|
move $6, %3
|
||
|
|
move $7, %4
|
||
|
|
syscall
|
||
|
|
nop
|
||
|
|
move %0, $2" : "=r"(ret) : "r"(func), "r"(p1), "r"(p2), "r"(p3));
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
// These need to be kept in sync with the definitions in Cygmon.
|
||
|
|
#define SYS_meminfo 1001
|
||
|
|
|
||
|
|
void *
|
||
|
|
get_mem_info (mem)
|
||
|
|
struct s_mem *mem;
|
||
|
|
{
|
||
|
|
unsigned long totmem = 0, topmem = 0;
|
||
|
|
int numbanks;
|
||
|
|
|
||
|
|
numbanks = sysCall(SYS_meminfo, (unsigned long)&totmem, (unsigned long)&topmem, 0);
|
||
|
|
mem->size = totmem;
|
||
|
|
return (void*)topmem;
|
||
|
|
}
|