142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/* cfe.c -- I/O code for the MIPS boards running CFE. */
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/*
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* Copyright 2001, 2002
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* Broadcom Corporation. All rights reserved.
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*
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* This software is furnished under license and may be used and copied only
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* in accordance with the following terms and conditions. Subject to these
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* conditions, you may download, copy, install, use, modify and distribute
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* modified or unmodified copies of this software in source and/or binary
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* form. No title or ownership is transferred hereby.
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*
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* 1) Any source code used, modified or distributed must reproduce and
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* retain this copyright notice and list of conditions as they appear in
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* the source file.
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*
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* 2) No right is granted to use any trade name, trademark, or logo of
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* Broadcom Corporation. The "Broadcom Corporation" name may not be
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* used to endorse or promote products derived from this software
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* without the prior written permission of Broadcom Corporation.
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*
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* 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
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* NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM BE LIABLE
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* FOR ANY DAMAGES WHATSOEVER, AND IN PARTICULAR, BROADCOM SHALL NOT BE
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* LIABLE FOR DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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*/
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#include "cfe_api.h"
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char inbyte (void);
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int outbyte (char c);
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/* Make sure cfe_prestart is used. It doesn't look like setting the
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entry symbol in the linker script to a symbol from that fiel will do
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this! */
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extern int _prestart;
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static void *force_prestart = &_prestart;
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/* The following variables are initialized to non-zero so that they'll be
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in data, rather than BSS. Used to be that you could init variables to
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any value to put them into initialized data sections rather than BSS,
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but that decades-old idiom went out the window with gcc 3.2. Now,
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either you compile specially (with -fno-zero-initialized-in-bss), or
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you init to non-zero. In this case, initting to non-zero is OK (and
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even beneficial; alignment fault via jump to odd if not properly
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set up by _prestart()), so we do the latter. */
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unsigned int __cfe_handle = 0xdeadbeef;
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unsigned int __cfe_entrypt = 0xdeadbeef;
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/* Echo input characters? */
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int __cfe_echo_input = 0;
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/* CFE handle used to access console device. */
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static int cfe_conshandle;
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char
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inbyte (void)
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{
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unsigned char c;
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int rv;
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while (cfe_read (cfe_conshandle, &c, 1) != 1)
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;
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if (c == '\r')
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c = '\n';
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if (__cfe_echo_input)
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outbyte (c);
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return c;
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}
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int
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outbyte (char c)
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{
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int res;
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do
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{
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res = cfe_write (cfe_conshandle, &c, 1);
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}
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while (res == 0);
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if (c == '\n')
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outbyte ('\r');
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return 0;
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}
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/* Initialize hardware. Called from crt0. */
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void
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hardware_init_hook(void)
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{
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cfe_init (__cfe_handle, __cfe_entrypt);
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cfe_conshandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
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}
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/* Avoid worst-case execution hazards. This is targetted at the SB-1
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pipe, and is much worse than it needs to be (not even counting
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the subroutine call and return). */
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void
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hardware_hazard_hook(void)
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{
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__asm__ __volatile__ (" .set push \n"
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" .set mips32 \n"
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" .set noreorder \n"
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" ssnop \n"
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" ssnop \n"
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" ssnop \n"
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" bnel $0, $0, .+4 \n"
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" ssnop \n"
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" .set pop \n");
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}
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/* Exit back to monitor, with the given status code. */
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void
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hardware_exit_hook (int status)
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{
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outbyte ('\r');
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outbyte ('\n');
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cfe_exit (CFE_FLG_WARMSTART, status);
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}
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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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struct s_mem
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{
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unsigned int size;
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unsigned int icsize;
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unsigned int dcsize;
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};
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void
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get_mem_info (mem)
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struct s_mem *mem;
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{
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/* XXX FIXME: Fake this for now. Should invoke cfe_enummem, but we
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don't have enough stack to do that (yet). */
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mem->size = 0x4000000; /* Assume 64 MB of RAM */
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}
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