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/*
* QEMU S390 Interactive Boot Menu
*
* Copyright 2018 IBM Corp.
* Author: Collin L. Walling <walling@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#include "libc.h"
#include "s390-ccw.h"
#include "sclp.h"
#define KEYCODE_NO_INP '\0'
#define KEYCODE_ESCAPE '\033'
#define KEYCODE_BACKSP '\177'
#define KEYCODE_ENTER '\r'
/* Offsets from zipl fields to zipl banner start */
#define ZIPL_TIMEOUT_OFFSET 138
#define ZIPL_FLAG_OFFSET 140
#define TOD_CLOCK_MILLISECOND 0x3e8000
#define LOW_CORE_EXTERNAL_INT_ADDR 0x86
#define CLOCK_COMPARATOR_INT 0X1004
static uint8_t flag;
static uint64_t timeout;
static inline void enable_clock_int(void)
{
uint64_t tmp = 0;
asm volatile(
"stctg 0,0,%0\n"
"oi 6+%0, 0x8\n"
"lctlg 0,0,%0"
: : "Q" (tmp) : "memory"
);
}
static inline void disable_clock_int(void)
{
uint64_t tmp = 0;
asm volatile(
"stctg 0,0,%0\n"
"ni 6+%0, 0xf7\n"
"lctlg 0,0,%0"
: : "Q" (tmp) : "memory"
);
}
static inline void set_clock_comparator(uint64_t time)
{
asm volatile("sckc %0" : : "Q" (time));
}
static inline bool check_clock_int(void)
{
uint16_t *code = (uint16_t *)LOW_CORE_EXTERNAL_INT_ADDR;
consume_sclp_int();
return *code == CLOCK_COMPARATOR_INT;
}
static int read_prompt(char *buf, size_t len)
{
char inp[2] = {};
uint8_t idx = 0;
uint64_t time;
if (timeout) {
time = get_clock() + timeout * TOD_CLOCK_MILLISECOND;
set_clock_comparator(time);
enable_clock_int();
timeout = 0;
}
while (!check_clock_int()) {
sclp_read(inp, 1); /* Process only one character at a time */
switch (inp[0]) {
case KEYCODE_NO_INP:
case KEYCODE_ESCAPE:
continue;
case KEYCODE_BACKSP:
if (idx > 0) {
buf[--idx] = 0;
sclp_print("\b \b");
}
continue;
case KEYCODE_ENTER:
disable_clock_int();
return idx;
default:
/* Echo input and add to buffer */
if (idx < len) {
buf[idx++] = inp[0];
sclp_print(inp);
}
}
}
disable_clock_int();
*buf = 0;
return 0;
}
static int get_index(void)
{
char buf[11];
int len;
int i;
memset(buf, 0, sizeof(buf));
sclp_set_write_mask(SCLP_EVENT_MASK_MSG_ASCII, SCLP_EVENT_MASK_MSG_ASCII);
len = read_prompt(buf, sizeof(buf) - 1);
sclp_set_write_mask(0, SCLP_EVENT_MASK_MSG_ASCII);
/* If no input, boot default */
if (len == 0) {
return 0;
}
/* Check for erroneous input */
for (i = 0; i < len; i++) {
if (!isdigit(buf[i])) {
return -1;
}
}
return atoui(buf);
}
static void boot_menu_prompt(bool retry)
{
char tmp[11];
if (retry) {
sclp_print("\nError: undefined configuration"
"\nPlease choose:\n");
} else if (timeout > 0) {
sclp_print("Please choose (default will boot in ");
sclp_print(uitoa(timeout / 1000, tmp, sizeof(tmp)));
sclp_print(" seconds):\n");
} else {
sclp_print("Please choose:\n");
}
}
static int get_boot_index(int entries)
{
int boot_index;
bool retry = false;
char tmp[5];
do {
boot_menu_prompt(retry);
boot_index = get_index();
retry = true;
} while (boot_index < 0 || boot_index >= entries);
sclp_print("\nBooting entry #");
sclp_print(uitoa(boot_index, tmp, sizeof(tmp)));
return boot_index;
}
static void zipl_println(const char *data, size_t len)
{
char buf[len + 2];
ebcdic_to_ascii(data, buf, len);
buf[len] = '\n';
buf[len + 1] = '\0';
sclp_print(buf);
}
int menu_get_zipl_boot_index(const char *menu_data)
{
size_t len;
int entries;
uint16_t zipl_flag = *(uint16_t *)(menu_data - ZIPL_FLAG_OFFSET);
uint16_t zipl_timeout = *(uint16_t *)(menu_data - ZIPL_TIMEOUT_OFFSET);
if (flag == QIPL_FLAG_BM_OPTS_ZIPL) {
if (!zipl_flag) {
return 0; /* Boot default */
}
/* zipl stores timeout as seconds */
timeout = zipl_timeout * 1000;
}
/* Print and count all menu items, including the banner */
for (entries = 0; *menu_data; entries++) {
len = strlen(menu_data);
zipl_println(menu_data, len);
menu_data += len + 1;
if (entries < 2) {
sclp_print("\n");
}
}
sclp_print("\n");
return get_boot_index(entries - 1); /* subtract 1 to exclude banner */
}
void menu_set_parms(uint8_t boot_menu_flag, uint32_t boot_menu_timeout)
{
flag = boot_menu_flag;
timeout = boot_menu_timeout;
}
bool menu_is_enabled_zipl(void)
{
return flag & (QIPL_FLAG_BM_OPTS_CMD | QIPL_FLAG_BM_OPTS_ZIPL);
}
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