There are some usage scenarios in which differing user domains want
to be using different base TOD clocks. This patch adds the ability
to specify the base TOD time difference. The patch also adds a
hook point to notify another entity when the domain changes this
offset. This might occur, for instance, on a Linux domain using
hwclock -w.
Signed-off-by: Ben Thomas (ben@xxxxxxxxxxxxxxx)
--
------------------------------------------------------------------------
Ben Thomas Virtual Iron Software
bthomas@xxxxxxxxxxxxxxx Tower 1, Floor 2
978-849-1214 900 Chelmsford Street
Lowell, MA 01851
diff -r 1e3977e029fd tools/ioemu/hw/mc146818rtc.c
--- a/tools/ioemu/hw/mc146818rtc.c Mon May 08 19:21:41 2006 +0100
+++ b/tools/ioemu/hw/mc146818rtc.c Wed May 10 15:33:56 2006 -0400
@@ -178,10 +178,27 @@ static inline int from_bcd(RTCState *s,
}
}
+static void send_timeoffset_msg(time_t delta)
+{
+
+/* This routine is used to inform another entity that the
+ base time offset has changed. For instance, if you
+ were using xenstore, you might want to write to the store
+ at this point. Or, you might use some other method.
+ Whatever you might chose, here's a hook point to implement it.
+
+ One item of note is that this delta is in addition to
+ any existing offset you might be already using. */
+
+ return;
+}
+
static void rtc_set_time(RTCState *s)
{
struct tm *tm = &s->current_tm;
-
+ time_t before, after;
+
+ before = mktime(tm);
tm->tm_sec = from_bcd(s, s->cmos_data[RTC_SECONDS]);
tm->tm_min = from_bcd(s, s->cmos_data[RTC_MINUTES]);
tm->tm_hour = from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
@@ -193,6 +210,12 @@ static void rtc_set_time(RTCState *s)
tm->tm_mday = from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]);
tm->tm_mon = from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
tm->tm_year = from_bcd(s, s->cmos_data[RTC_YEAR]) + 100;
+
+ /* Compute, and send, the additional time delta
+ We could compute the total time delta, but this is
+ sufficient, and simple. */
+ after = mktime(tm);
+ send_timeoffset_msg(after-before);
}
static void rtc_copy_date(RTCState *s)
diff -r 1e3977e029fd tools/ioemu/hw/pc.c
--- a/tools/ioemu/hw/pc.c Mon May 08 19:21:41 2006 +0100
+++ b/tools/ioemu/hw/pc.c Wed May 10 15:33:56 2006 -0400
@@ -118,7 +118,7 @@ static void cmos_init_hd(int type_ofs, i
}
/* hd_table must contain 4 block drivers */
-static void cmos_init(uint64_t ram_size, int boot_device, BlockDriverState
**hd_table)
+static void cmos_init(uint64_t ram_size, int boot_device, BlockDriverState
**hd_table, time_t timeoffset)
{
RTCState *s = rtc_state;
int val;
@@ -129,6 +129,7 @@ static void cmos_init(uint64_t ram_size,
/* set the CMOS date */
time(&ti);
+ ti += timeoffset;
if (rtc_utc)
tm = gmtime(&ti);
else
@@ -379,7 +380,7 @@ void pc_init(uint64_t ram_size, int vga_
void pc_init(uint64_t ram_size, int vga_ram_size, int boot_device,
DisplayState *ds, const char **fd_filename, int snapshot,
const char *kernel_filename, const char *kernel_cmdline,
- const char *initrd_filename)
+ const char *initrd_filename, time_t timeoffset)
{
char buf[1024];
int ret, linux_boot, initrd_size, i, nb_nics1;
@@ -573,7 +574,7 @@ void pc_init(uint64_t ram_size, int vga_
floppy_controller = fdctrl_init(6, 2, 0, 0x3f0, fd_table);
- cmos_init(ram_size, boot_device, bs_table);
+ cmos_init(ram_size, boot_device, bs_table, timeoffset);
/* must be done after all PCI devices are instanciated */
/* XXX: should be done in the Bochs BIOS */
diff -r 1e3977e029fd tools/ioemu/vl.c
--- a/tools/ioemu/vl.c Mon May 08 19:21:41 2006 +0100
+++ b/tools/ioemu/vl.c Wed May 10 15:33:56 2006 -0400
@@ -155,6 +155,7 @@ void *vtop_table;
void *vtop_table;
unsigned long toptab;
unsigned long vgaram_pages;
+time_t timeoffset = 0;
/***********************************************************/
/* x86 ISA bus support */
@@ -2255,9 +2256,10 @@ void help(void)
"-s wait gdb connection to port %d\n"
"-p port ioreq port for xen\n"
"-d domain domain that we're serving\n"
- "-domain-namn domain name that we're serving\n"
+ "-domain-name domain name that we're serving\n"
"-hdachs c,h,s force hard disk 0 geometry (usually qemu can guess
it)\n"
"-L path set the directory for the BIOS and VGA BIOS\n"
+ "-timeoffset time offset (in seconds) from local time (Xen)\n"
#ifdef USE_CODE_COPY
"-no-code-copy disable code copy acceleration\n"
#endif
@@ -2355,6 +2357,7 @@ enum {
QEMU_OPTION_monitor,
QEMU_OPTION_domainname,
QEMU_OPTION_serial,
+ QEMU_OPTION_timeoffset,
QEMU_OPTION_loadvm,
QEMU_OPTION_full_screen,
QEMU_OPTION_vgaacc,
@@ -2428,6 +2431,7 @@ const QEMUOption qemu_options[] = {
{ "std-vga", 0, QEMU_OPTION_std_vga },
{ "monitor", 1, QEMU_OPTION_monitor },
{ "domain-name", 1, QEMU_OPTION_domainname },
+ { "timeoffset", HAS_ARG, QEMU_OPTION_timeoffset },
{ "serial", 1, QEMU_OPTION_serial },
{ "loadvm", HAS_ARG, QEMU_OPTION_loadvm },
{ "full-screen", 0, QEMU_OPTION_full_screen },
@@ -3058,7 +3062,10 @@ int main(int argc, char **argv)
case QEMU_OPTION_domainname:
strncat(domain_name, optarg, sizeof(domain_name) - 20);
break;
-
+ case QEMU_OPTION_timeoffset:
+ timeoffset = strtol(optarg, NULL, 0);
+ break;
+
}
}
}
@@ -3396,7 +3403,7 @@ int main(int argc, char **argv)
#if defined(TARGET_I386)
pc_init(ram_size, vga_ram_size, boot_device,
ds, fd_filename, snapshot,
- kernel_filename, kernel_cmdline, initrd_filename);
+ kernel_filename, kernel_cmdline, initrd_filename, timeoffset);
#elif defined(TARGET_PPC)
ppc_init(ram_size, vga_ram_size, boot_device,
ds, fd_filename, snapshot,
diff -r 1e3977e029fd tools/ioemu/vl.h
--- a/tools/ioemu/vl.h Mon May 08 19:21:41 2006 +0100
+++ b/tools/ioemu/vl.h Wed May 10 15:33:56 2006 -0400
@@ -663,7 +663,7 @@ void pc_init(uint64_t ram_size, int vga_
void pc_init(uint64_t ram_size, int vga_ram_size, int boot_device,
DisplayState *ds, const char **fd_filename, int snapshot,
const char *kernel_filename, const char *kernel_cmdline,
- const char *initrd_filename);
+ const char *initrd_filename, time_t timeoffset);
/* ppc.c */
void ppc_init (int ram_size, int vga_ram_size, int boot_device,
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