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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [libgloss/] [mips/] [cygmon.c] - Rev 308
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/* 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 ( " \n\ move $4, %1 \n\ move $5, %2 \n\ move $6, %3 \n\ move $7, %4 \n\ syscall \n\ nop \n\ 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; }
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