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hvm, x86: Add QEMU BIOS menu for choosing boot device.
The attached patch implements a mini BIOS menu for choosing a non-default boot device. When a guest starts it'll display 'Press F10 to select boot device' And wait 3 seconds, before continuing with the normal boot device. If they press the F10 key, a menu is shown allowing a choice between floppy, harddisk, cdrom and network (PXE). I can't take credit for this originally - Jeremy Katz wrote it for KVM, I merely re-diffed the patch to work against Xen's QEMU/BIOS code tree. It has been tested in Fedora successfully against 3.1.x and 3.2.x Signed-off-by: Daniel P. Berrange <berrange@redhat.com> CC: Jeremy Katz <katzj@redhat.com> If more than one boot device has been selected, the currently selected number displayed in the menu is wrong. Signed-off-by: Stefano Stabellini <stefano.stabellini@citrix.com>
This commit is contained in:
Keir Fraser committed
1 parent
6aef553b66
commit
136beff178
1 file changed
+226
-1
@@ -2031,6 +2031,229 @@ print_cdromboot_failure( code )
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return;
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}
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#define WAIT_HZ 18
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/**
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* Check for keystroke.
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* @returns True if keystroke available, False if not.
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*/
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Bit8u check_for_keystroke()
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{
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ASM_START
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mov ax, #0x100
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int #0x16
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jz no_key
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mov al, #1
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jmp done
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no_key:
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xor al, al
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done:
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ASM_END
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}
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/**
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* Get keystroke.
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* @returns BIOS scan code.
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*/
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Bit8u get_keystroke()
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{
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ASM_START
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mov ax, #0x0
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int #0x16
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xchg ah, al
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ASM_END
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}
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/**
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* Waits (sleeps) for the given number of ticks.
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* Checks for keystroke.
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*
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* @returns BIOS scan code if available, 0 if not.
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* @param ticks Number of ticks to sleep.
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* @param stop_on_key Whether to stop immediately upon keypress.
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*/
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Bit8u wait(ticks, stop_on_key)
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Bit16u ticks;
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Bit8u stop_on_key;
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{
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long ticks_to_wait, delta;
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Bit32u prev_ticks, t;
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Bit8u scan_code = 0;
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/*
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* The 0:046c wraps around at 'midnight' according to a 18.2Hz clock.
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* We also have to be careful about interrupt storms.
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*/
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ticks_to_wait = ticks;
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prev_ticks = read_dword(0x0, 0x46c);
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do
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{
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t = read_dword(0x0, 0x46c);
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if (t > prev_ticks)
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{
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delta = t - prev_ticks; /* The temp var is required or bcc screws up. */
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ticks_to_wait -= delta;
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}
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else if (t < prev_ticks)
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ticks_to_wait -= t; /* wrapped */
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prev_ticks = t;
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if (check_for_keystroke())
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{
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scan_code = get_keystroke();
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bios_printf(BIOS_PRINTF_DEBUG, "Key pressed: %x\n", scan_code);
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if (stop_on_key)
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return scan_code;
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}
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} while (ticks_to_wait > 0);
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return scan_code;
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}
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static void clearscreen() {
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/* Hide cursor, clear screen and move cursor to starting position */
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ASM_START
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push bx
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push cx
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push dx
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mov ax, #0x100
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mov cx, #0x1000
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int #0x10
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mov ax, #0x700
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mov bh, #7
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xor cx, cx
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mov dx, #0x184f
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int #0x10
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mov ax, #0x200
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xor bx, bx
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xor dx, dx
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int #0x10
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pop dx
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pop cx
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pop bx
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ASM_END
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}
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int bootmenu(selected)
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int selected;
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{
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Bit8u scode;
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int max;
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/* get the number of boot devices */
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max = read_word(IPL_SEG, IPL_COUNT_OFFSET);
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for(;;) {
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if (selected > max || selected < 1) selected = 1;
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clearscreen();
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bios_printf(BIOS_PRINTF_SCREEN | BIOS_PRINTF_INFO, "\n\n\n\n\n\n\n");
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bios_printf(BIOS_PRINTF_SCREEN | BIOS_PRINTF_INFO, " Select boot device\n\n");
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bios_printf(BIOS_PRINTF_SCREEN | BIOS_PRINTF_INFO, " 1. Floppy\n");
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bios_printf(BIOS_PRINTF_SCREEN | BIOS_PRINTF_INFO, " 2. Hard drive\n");
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bios_printf(BIOS_PRINTF_SCREEN | BIOS_PRINTF_INFO, " 3. CD-ROM\n");
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if (max == 4)
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bios_printf(BIOS_PRINTF_SCREEN | BIOS_PRINTF_INFO, " 4. Network\n");
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bios_printf(BIOS_PRINTF_SCREEN | BIOS_PRINTF_INFO, "\n\n Currently selected: %d\n", selected);
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do {
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scode = wait(WAIT_HZ, 1);
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} while (scode == 0);
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switch(scode) {
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case 0x02:
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case 0x03:
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case 0x04:
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selected = scode - 1;
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break;
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case 0x05:
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if (max == 4)
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selected = scode -1 ;
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else
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scode = 0;
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break;
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case 0x48:
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selected -= 1;
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if (selected < 1)
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selected = 1;
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scode = 0;
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break;
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case 0x50:
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selected += 1;
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if (selected > max)
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selected = max;
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scode = 0;
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break;
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case 0x1c:
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break;
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default:
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scode = 0;
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break;
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}
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if (scode != 0)
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break;
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}
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switch (selected) {
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case 1:
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return 0x3D;
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case 2:
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return 0x3E;
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case 3:
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return 0x3F;
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case 4:
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return 0x58;
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default:
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return 0;
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}
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}
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void interactive_bootkey()
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{
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Bit16u i;
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Bit8u scan = 0;
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bios_printf(BIOS_PRINTF_SCREEN | BIOS_PRINTF_INFO, "\n\nPress F10 to select boot device.\n");
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for (i = 3; i > 0; i--)
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{
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scan = wait(WAIT_HZ, 0);
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switch (scan) {
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case 0x3D:
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case 0x3E:
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case 0x3F:
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case 0x58:
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break;
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case 0x44:
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scan = bootmenu(inb_cmos(0x3d) & 0x0f);
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break;
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default:
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scan = 0;
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break;
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}
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if (scan != 0)
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break;
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}
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/* set the default based on the keypress or menu */
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switch(scan) {
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case 0x3D:
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outb_cmos(0x3d, 0x01);
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break;
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case 0x3E:
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outb_cmos(0x3d, 0x02);
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break;
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case 0x3F:
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outb_cmos(0x3d, 0x03);
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break;
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case 0x58:
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outb_cmos(0x3d, 0x04);
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break;
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default:
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break;
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}
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}
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void
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nmi_handler_msg()
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{
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@@ -9825,7 +10048,9 @@ post_default_ints:
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call _cdemu_init
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;;
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#endif // BX_ELTORITO_BOOT
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call _interactive_bootkey
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#if BX_TCGBIOS
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call _tcpa_calling_int19h /* specs: 8.2.3 step 1 */
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call _tcpa_add_event_separators /* specs: 8.2.3 step 2 */
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