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// SPDX-License-Identifier: GPL-2.0
#include <linux/stdarg.h>
#include <linux/ctype.h>
#include <linux/efi.h>
#include <linux/kernel.h>
#include <linux/kern_levels.h>
#include <asm/efi.h>
#include <asm/setup.h>
#include "efistub.h"
int efi_loglevel = LOGLEVEL_NOTICE;
/**
* efi_char16_puts() - Write a UCS-2 encoded string to the console
* @str: UCS-2 encoded string
*/
void efi_char16_puts(efi_char16_t *str)
{
efi_call_proto(efi_table_attr(efi_system_table, con_out),
output_string, str);
}
/**
* efi_printk() - Print a kernel message
* @fmt: format string
*
* The first letter of the format string is used to determine the logging level
* of the message. If the level is less then the current EFI logging level, the
* message is suppressed. The message will be truncated to 255 characters
* (ignoring surrogates).
*
* Return: number of printed characters
*/
int efi_printk(const char *fmt, ...)
{
efi_char16_t printf_buf[256];
va_list args;
int printed;
int loglevel = printk_get_level(fmt);
switch (loglevel) {
case '0' ... '9':
loglevel -= '0';
break;
default:
/*
* Use loglevel -1 for cases where we just want to print to
* the screen.
*/
loglevel = -1;
break;
}
if (loglevel >= efi_loglevel)
return 0;
if (loglevel >= 0)
efi_char16_puts(L"EFI stub: ");
fmt = printk_skip_level(fmt);
va_start(args, fmt);
printed = efi_vsnprintf(printf_buf, ARRAY_SIZE(printf_buf), fmt, args,
true);
va_end(args);
efi_char16_puts(printf_buf);
if (printed >= ARRAY_SIZE(printf_buf)) {
efi_char16_puts(L"[Message truncated]\r\n");
return -1;
}
return printed;
}
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