mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-18 10:13:57 +08:00
c141611fb1
None of these files are actually using any __init type directives and hence don't need to include <linux/init.h>. Most are just a left over from __devinit and __cpuinit removal, or simply due to code getting copied from one driver to the next. The one instance where we add an include for init.h covers off a case where that file was implicitly getting it from another header which itself didn't need it. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
/*
|
|
* A udbg backend which logs messages and reads input from in memory
|
|
* buffers.
|
|
*
|
|
* The console output can be read from memcons_output which is a
|
|
* circular buffer whose next write position is stored in memcons.output_pos.
|
|
*
|
|
* Input may be passed by writing into the memcons_input buffer when it is
|
|
* empty. The input buffer is empty when both input_pos == input_start and
|
|
* *input_start == '\0'.
|
|
*
|
|
* Copyright (C) 2003-2005 Anton Blanchard and Milton Miller, IBM Corp
|
|
* Copyright (C) 2013 Alistair Popple, IBM Corp
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <asm/barrier.h>
|
|
#include <asm/page.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/udbg.h>
|
|
|
|
struct memcons {
|
|
char *output_start;
|
|
char *output_pos;
|
|
char *output_end;
|
|
char *input_start;
|
|
char *input_pos;
|
|
char *input_end;
|
|
};
|
|
|
|
static char memcons_output[CONFIG_PPC_MEMCONS_OUTPUT_SIZE];
|
|
static char memcons_input[CONFIG_PPC_MEMCONS_INPUT_SIZE];
|
|
|
|
struct memcons memcons = {
|
|
.output_start = memcons_output,
|
|
.output_pos = memcons_output,
|
|
.output_end = &memcons_output[CONFIG_PPC_MEMCONS_OUTPUT_SIZE],
|
|
.input_start = memcons_input,
|
|
.input_pos = memcons_input,
|
|
.input_end = &memcons_input[CONFIG_PPC_MEMCONS_INPUT_SIZE],
|
|
};
|
|
|
|
void memcons_putc(char c)
|
|
{
|
|
char *new_output_pos;
|
|
|
|
*memcons.output_pos = c;
|
|
wmb();
|
|
new_output_pos = memcons.output_pos + 1;
|
|
if (new_output_pos >= memcons.output_end)
|
|
new_output_pos = memcons.output_start;
|
|
|
|
memcons.output_pos = new_output_pos;
|
|
}
|
|
|
|
int memcons_getc_poll(void)
|
|
{
|
|
char c;
|
|
char *new_input_pos;
|
|
|
|
if (*memcons.input_pos) {
|
|
c = *memcons.input_pos;
|
|
|
|
new_input_pos = memcons.input_pos + 1;
|
|
if (new_input_pos >= memcons.input_end)
|
|
new_input_pos = memcons.input_start;
|
|
else if (*new_input_pos == '\0')
|
|
new_input_pos = memcons.input_start;
|
|
|
|
*memcons.input_pos = '\0';
|
|
wmb();
|
|
memcons.input_pos = new_input_pos;
|
|
return c;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
int memcons_getc(void)
|
|
{
|
|
int c;
|
|
|
|
while (1) {
|
|
c = memcons_getc_poll();
|
|
if (c == -1)
|
|
cpu_relax();
|
|
else
|
|
break;
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
void udbg_init_memcons(void)
|
|
{
|
|
udbg_putc = memcons_putc;
|
|
udbg_getc = memcons_getc;
|
|
udbg_getc_poll = memcons_getc_poll;
|
|
}
|