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