mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-26 12:34:41 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
/*
|
|
* hvconsole.c
|
|
* Copyright (C) 2004 Hollis Blanchard, IBM Corporation
|
|
* Copyright (C) 2004 IBM Corporation
|
|
*
|
|
* Additional Author(s):
|
|
* Ryan S. Arnold <rsa@us.ibm.com>
|
|
*
|
|
* LPAR console support.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <asm/hvcall.h>
|
|
#include <asm/hvconsole.h>
|
|
#include <asm/prom.h>
|
|
|
|
/**
|
|
* hvc_get_chars - retrieve characters from firmware for denoted vterm adatper
|
|
* @vtermno: The vtermno or unit_address of the adapter from which to fetch the
|
|
* data.
|
|
* @buf: The character buffer into which to put the character data fetched from
|
|
* firmware.
|
|
* @count: not used?
|
|
*/
|
|
int hvc_get_chars(uint32_t vtermno, char *buf, int count)
|
|
{
|
|
unsigned long got;
|
|
|
|
if (plpar_hcall(H_GET_TERM_CHAR, vtermno, 0, 0, 0, &got,
|
|
(unsigned long *)buf, (unsigned long *)buf+1) == H_Success) {
|
|
/*
|
|
* Work around a HV bug where it gives us a null
|
|
* after every \r. -- paulus
|
|
*/
|
|
if (got > 0) {
|
|
int i;
|
|
for (i = 1; i < got; ++i) {
|
|
if (buf[i] == 0 && buf[i-1] == '\r') {
|
|
--got;
|
|
if (i < got)
|
|
memmove(&buf[i], &buf[i+1],
|
|
got - i);
|
|
}
|
|
}
|
|
}
|
|
return got;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(hvc_get_chars);
|
|
|
|
/**
|
|
* hvc_put_chars: send characters to firmware for denoted vterm adapter
|
|
* @vtermno: The vtermno or unit_address of the adapter from which the data
|
|
* originated.
|
|
* @buf: The character buffer that contains the character data to send to
|
|
* firmware.
|
|
* @count: Send this number of characters.
|
|
*/
|
|
int hvc_put_chars(uint32_t vtermno, const char *buf, int count)
|
|
{
|
|
unsigned long *lbuf = (unsigned long *) buf;
|
|
long ret;
|
|
|
|
ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0],
|
|
lbuf[1]);
|
|
if (ret == H_Success)
|
|
return count;
|
|
if (ret == H_Busy)
|
|
return 0;
|
|
return -EIO;
|
|
}
|
|
|
|
EXPORT_SYMBOL(hvc_put_chars);
|
|
|
|
/*
|
|
* We hope/assume that the first vty found corresponds to the first console
|
|
* device.
|
|
*/
|
|
int hvc_find_vtys(void)
|
|
{
|
|
struct device_node *vty;
|
|
int num_found = 0;
|
|
|
|
for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
|
|
vty = of_find_node_by_name(vty, "vty")) {
|
|
uint32_t *vtermno;
|
|
|
|
/* We have statically defined space for only a certain number of
|
|
* console adapters. */
|
|
if (num_found >= MAX_NR_HVC_CONSOLES)
|
|
break;
|
|
|
|
vtermno = (uint32_t *)get_property(vty, "reg", NULL);
|
|
if (!vtermno)
|
|
continue;
|
|
|
|
if (device_is_compatible(vty, "hvterm1")) {
|
|
hvc_instantiate(*vtermno, num_found);
|
|
++num_found;
|
|
}
|
|
}
|
|
|
|
return num_found;
|
|
}
|