199767f8919635c4928607450d9e0abb932109ceToomas Soome * Copyright (c) 2004 Hidetoshi Shimokawa
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Redistribution and use in source and binary forms, with or without
199767f8919635c4928607450d9e0abb932109ceToomas Soome * modification, are permitted provided that the following conditions
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 1. Redistributions of source code must retain the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome * notice, this list of conditions and the following disclaimer.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome * notice, this list of conditions and the following disclaimer in the
199767f8919635c4928607450d9e0abb932109ceToomas Soome * documentation and/or other materials provided with the distribution.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
199767f8919635c4928607450d9e0abb932109ceToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
199767f8919635c4928607450d9e0abb932109ceToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
199767f8919635c4928607450d9e0abb932109ceToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
199767f8919635c4928607450d9e0abb932109ceToomas Soome * SUCH DAMAGE.
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic void dconsole_putchar(int c);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int dconsole_getchar(void);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int dconsole_ischar(void);
199767f8919635c4928607450d9e0abb932109ceToomas Soome/* The buffer must be allocated in BSS becase:
199767f8919635c4928607450d9e0abb932109ceToomas Soome * - The dcons driver in the kernel is initialized before VM/pmap is
199767f8919635c4928607450d9e0abb932109ceToomas Soome * initialized, so that the buffer must be allocate in the region
199767f8919635c4928607450d9e0abb932109ceToomas Soome * that is mapped at the very early boot state.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * - We expect identiy map only for regions before KERNLOAD
199767f8919635c4928607450d9e0abb932109ceToomas Soome * (i386:4MB amd64:1MB).
199767f8919635c4928607450d9e0abb932109ceToomas Soome * - It seems that heap in conventional memory(640KB) is not sufficent
199767f8919635c4928607450d9e0abb932109ceToomas Soome * and we move it to high address as LOADER_SUPPORT_BZIP2.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * - BSS is placed in conventional memory.
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic char dcons_buffer[DCONS_BUF_SIZE + PAGE_SIZE];
199767f8919635c4928607450d9e0abb932109ceToomas Soome "dumb console port",
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* XXX check the BIOS equipment list? */
199767f8919635c4928607450d9e0abb932109ceToomas Soome dbuf = (char *)round_page((vm_offset_t)&dcons_buffer[0]);