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/* Copyright 2016 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <skiboot.h>
#include <console.h>
#include "mambo.h"
/*
* The SIM_READ_CONSOLE callout will return -1 if there is no character to read.
* There's no explicit poll callout so we "poll" by doing a read and stashing
* the result until we do an actual read.
*/
static int mambo_char = -1;
static bool mambo_console_poll(void)
{
if (mambo_char < 0)
mambo_char = callthru0(SIM_READ_CONSOLE_CODE);
return mambo_char >= 0;
}
static size_t mambo_console_read(char *buf, size_t len)
{
size_t count = 0;
while (count < len) {
if (!mambo_console_poll())
break;
buf[count++] = mambo_char;
mambo_char = -1;
}
return count;
}
size_t mambo_console_write(const char *buf, size_t len)
{
callthru2(SIM_WRITE_CONSOLE_CODE, (unsigned long)buf, len);
return len;
}
static struct con_ops mambo_con_driver = {
.poll_read = mambo_console_poll,
.read = mambo_console_read,
.write = mambo_console_write,
};
void enable_mambo_console(void)
{
prlog(PR_NOTICE, "Enabling Mambo console\n");
set_console(&mambo_con_driver);
}
/*
* mambo console based printf(), this is useful for debugging the console
* since mambo_console_write() can be safely called from anywhere.
*
* This is a debug hack and you shouldn't use it in real code.
*/
void mprintf(const char *fmt, ...)
{
char buf[320];
va_list args;
int i;
va_start(args, fmt);
i = vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
mambo_console_write(buf, i);
}
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