@@ -12,16 +12,160 @@
#include "menu.h"
#include "s390-ccw.h"
-static uint8_t flags;
-static uint64_t timeout;
+#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_SECOND 0xf4240000
+
+static uint8_t flags;
+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 *)0x86; /* low-core external interrupt code */
+
+ consume_sclp_int();
+
+ return *code == 0x1004;
+}
+
+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_SECOND;
+ 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[10];
+ int len;
+ int i;
+
+ memset(buf, 0, sizeof(buf));
+
+ len = read_prompt(buf, sizeof(buf));
+
+ /* 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[6];
+
+ if (retry) {
+ sclp_print("\nError: undefined configuration"
+ "\nPlease choose:\n");
+ } else if (timeout > 0) {
+ sclp_print("Please choose (default will boot in ");
+ sclp_print(itostr(timeout, tmp, sizeof(tmp)));
+ sclp_print(" seconds):\n");
+ } else {
+ sclp_print("Please choose:\n");
+ }
+}
+
static int get_boot_index(int entries)
{
- return 0; /* Implemented next patch */
+ 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(itostr(boot_index, tmp, sizeof(tmp)));
+
+ return boot_index;
}
static void zipl_println(const char *data, size_t len)
@@ -71,6 +71,8 @@ unsigned int get_loadparm_index(void);
void sclp_print(const char *string);
void sclp_setup(void);
void sclp_get_loadparm_ascii(char *loadparm);
+int sclp_read(char *str, size_t count);
+void sclp_clear_write_mask(void);
/* virtio.c */
unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
@@ -79,6 +81,7 @@ bool virtio_is_supported(SubChannelId schid);
void virtio_blk_setup_device(SubChannelId schid);
int virtio_read(ulong sector, void *load_addr);
int enable_mss_facility(void);
+u64 get_clock(void);
ulong get_second(void);
/* bootmap.c */
@@ -101,3 +101,22 @@ void sclp_get_loadparm_ascii(char *loadparm)
ebcdic_to_ascii((char *) sccb->loadparm, loadparm, 8);
}
}
+
+int sclp_read(char *str, size_t count)
+{
+ ReadEventData *sccb = (void *)_sccb;
+ char *buf = (char *)(&sccb->ebh) + 7;
+
+ /* If count exceeds max buffer size, then restrict it to the max size */
+ if (count > SCCB_SIZE - 8) {
+ count = SCCB_SIZE - 8;
+ }
+
+ sccb->h.length = SCCB_SIZE;
+ sccb->h.function_code = SCLP_UNCONDITIONAL_READ;
+
+ sclp_service_call(SCLP_CMD_READ_EVENT_DATA, sccb);
+ memcpy(str, buf, count);
+
+ return sccb->ebh.length - 7;
+}
@@ -176,7 +176,7 @@ void vring_send_buf(VRing *vr, void *p, int len, int flags)
}
}
-static u64 get_clock(void)
+u64 get_clock(void)
{
u64 r;
Implements an sclp_read function to capture input from the console and a wrapper function that handles parsing certain characters and adding input to a buffer. The input is checked for any erroneous values and is handled appropriately. A prompt will persist until input is entered or the timeout expires (if one was set). Example: Please choose (default will boot in 10 seconds): Correct input will boot the respective boot index. If the user's input is empty, 0, or if the timeout expires, then the default zipl entry will be chosen. If the input is within the range of available boot entries, then the selection will be booted. Any erroneous input will cancel the timeout and re-prompt the user. Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com> Reviewed-by: Thomas Huth <thuth@redhat.com> --- pc-bios/s390-ccw/menu.c | 150 +++++++++++++++++++++++++++++++++++++++++++- pc-bios/s390-ccw/s390-ccw.h | 3 + pc-bios/s390-ccw/sclp.c | 19 ++++++ pc-bios/s390-ccw/virtio.c | 2 +- 4 files changed, 170 insertions(+), 4 deletions(-)