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/*
* EFI efi_selftest
*
* Copyright (c) 2017 Heinrich Schuchardt <xypron.glpk@gmx.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <efi_selftest.h>
#include <vsprintf.h>
struct efi_simple_text_output_protocol *con_out;
struct efi_simple_input_interface *con_in;
/*
* Print a MAC address to an u16 string
*
* @pointer: mac address
* @buf: pointer to buffer address
* on return position of terminating zero word
*/
static void mac(void *pointer, u16 **buf)
{
int i, j;
u16 c;
u8 *p = (u8 *)pointer;
u8 byte;
u16 *pos = *buf;
for (i = 0; i < ARP_HLEN; ++i) {
if (i)
*pos++ = ':';
byte = p[i];
for (j = 4; j >= 0; j -= 4) {
c = (byte >> j) & 0x0f;
c += '0';
if (c > '9')
c += 'a' - '9' - 1;
*pos++ = c;
}
}
*pos = 0;
*buf = pos;
}
/*
* Print a pointer to an u16 string
*
* @pointer: pointer
* @buf: pointer to buffer address
* on return position of terminating zero word
*/
static void pointer(void *pointer, u16 **buf)
{
int i;
u16 c;
uintptr_t p = (uintptr_t)pointer;
u16 *pos = *buf;
for (i = 8 * sizeof(p) - 4; i >= 0; i -= 4) {
c = (p >> i) & 0x0f;
c += '0';
if (c > '9')
c += 'a' - '9' - 1;
*pos++ = c;
}
*pos = 0;
*buf = pos;
}
/*
* Print an unsigned 32bit value as decimal number to an u16 string
*
* @value: value to be printed
* @buf: pointer to buffer address
* on return position of terminating zero word
*/
static void uint2dec(u32 value, u16 **buf)
{
u16 *pos = *buf;
int i;
u16 c;
u64 f;
/*
* Increment by .5 and multiply with
* (2 << 60) / 1,000,000,000 = 0x44B82FA0.9B5A52CC
* to move the first digit to bit 60-63.
*/
f = 0x225C17D0;
f += (0x9B5A52DULL * value) >> 28;
f += 0x44B82FA0ULL * value;
for (i = 0; i < 10; ++i) {
/* Write current digit */
c = f >> 60;
if (c || pos != *buf)
*pos++ = c + '0';
/* Eliminate current digit */
f &= 0xfffffffffffffff;
/* Get next digit */
f *= 0xaULL;
}
if (pos == *buf)
*pos++ = '0';
*pos = 0;
*buf = pos;
}
/*
* Print a signed 32bit value as decimal number to an u16 string
*
* @value: value to be printed
* @buf: pointer to buffer address
* on return position of terminating zero word
*/
static void int2dec(s32 value, u16 **buf)
{
u32 u;
u16 *pos = *buf;
if (value < 0) {
*pos++ = '-';
u = -value;
} else {
u = value;
}
uint2dec(u, &pos);
*buf = pos;
}
/*
* Print a formatted string to the EFI console
*
* @fmt: format string
* @...: optional arguments
*/
void efi_st_printf(const char *fmt, ...)
{
va_list args;
u16 buf[160];
const char *c;
u16 *pos = buf;
const char *s;
const u16 *u;
va_start(args, fmt);
c = fmt;
for (; *c; ++c) {
switch (*c) {
case '\\':
++c;
switch (*c) {
case '\0':
--c;
break;
case 'n':
*pos++ = '\n';
break;
case 'r':
*pos++ = '\r';
break;
case 't':
*pos++ = '\t';
break;
default:
*pos++ = *c;
}
break;
case '%':
++c;
switch (*c) {
case '\0':
--c;
break;
case 'd':
int2dec(va_arg(args, s32), &pos);
break;
case 'p':
++c;
switch (*c) {
/* MAC address */
case 'm':
mac(va_arg(args, void*), &pos);
break;
/* u16 string */
case 's':
u = va_arg(args, u16*);
/* Ensure string fits into buffer */
for (; *u && pos < buf + 120; ++u)
*pos++ = *u;
break;
default:
--c;
pointer(va_arg(args, void*), &pos);
}
break;
case 's':
s = va_arg(args, const char *);
for (; *s; ++s)
*pos++ = *s;
break;
case 'u':
uint2dec(va_arg(args, u32), &pos);
break;
default:
break;
}
break;
default:
*pos++ = *c;
}
}
va_end(args);
*pos = 0;
con_out->output_string(con_out, buf);
}
/*
* Reads an Unicode character from the input device.
*
* @return: Unicode character
*/
u16 efi_st_get_key(void)
{
struct efi_input_key input_key;
efi_status_t ret;
/* Wait for next key */
do {
ret = con_in->read_key_stroke(con_in, &input_key);
} while (ret == EFI_NOT_READY);
return input_key.unicode_char;
}
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