primitive ioport debug - /dev/rtc fast timer support (needed for better simulation accuracy with Linux 2.4)
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@799 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/vl.c b/vl.c
index e89091d..05c6f0f 100644
--- a/vl.c
+++ b/vl.c
@@ -43,6 +43,7 @@
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/if_tun.h>
+#include <linux/rtc.h>
#endif
#if defined(CONFIG_SLIRP)
@@ -77,6 +78,7 @@
#define DEFAULT_NETWORK_SCRIPT "/etc/qemu-ifup"
//#define DEBUG_UNUSED_IOPORT
+//#define DEBUG_IOPORT
#if !defined(CONFIG_SOFTMMU)
#define PHYS_RAM_MAX_SIZE (256 * 1024 * 1024)
@@ -274,37 +276,67 @@
void cpu_outb(CPUState *env, int addr, int val)
{
addr &= (MAX_IOPORTS - 1);
+#ifdef DEBUG_IOPORT
+ if (loglevel & CPU_LOG_IOPORT)
+ fprintf(logfile, "outb: %04x %02x\n", addr, val);
+#endif
ioport_write_table[0][addr](ioport_opaque[addr], addr, val);
}
void cpu_outw(CPUState *env, int addr, int val)
{
addr &= (MAX_IOPORTS - 1);
+#ifdef DEBUG_IOPORT
+ if (loglevel & CPU_LOG_IOPORT)
+ fprintf(logfile, "outw: %04x %04x\n", addr, val);
+#endif
ioport_write_table[1][addr](ioport_opaque[addr], addr, val);
}
void cpu_outl(CPUState *env, int addr, int val)
{
addr &= (MAX_IOPORTS - 1);
+#ifdef DEBUG_IOPORT
+ if (loglevel & CPU_LOG_IOPORT)
+ fprintf(logfile, "outl: %04x %08x\n", addr, val);
+#endif
ioport_write_table[2][addr](ioport_opaque[addr], addr, val);
}
int cpu_inb(CPUState *env, int addr)
{
+ int val;
addr &= (MAX_IOPORTS - 1);
- return ioport_read_table[0][addr](ioport_opaque[addr], addr);
+ val = ioport_read_table[0][addr](ioport_opaque[addr], addr);
+#ifdef DEBUG_IOPORT
+ if (loglevel & CPU_LOG_IOPORT)
+ fprintf(logfile, "inb : %04x %02x\n", addr, val);
+#endif
+ return val;
}
int cpu_inw(CPUState *env, int addr)
{
+ int val;
addr &= (MAX_IOPORTS - 1);
- return ioport_read_table[1][addr](ioport_opaque[addr], addr);
+ val = ioport_read_table[1][addr](ioport_opaque[addr], addr);
+#ifdef DEBUG_IOPORT
+ if (loglevel & CPU_LOG_IOPORT)
+ fprintf(logfile, "inw : %04x %04x\n", addr, val);
+#endif
+ return val;
}
int cpu_inl(CPUState *env, int addr)
{
+ int val;
addr &= (MAX_IOPORTS - 1);
- return ioport_read_table[2][addr](ioport_opaque[addr], addr);
+ val = ioport_read_table[2][addr](ioport_opaque[addr], addr);
+#ifdef DEBUG_IOPORT
+ if (loglevel & CPU_LOG_IOPORT)
+ fprintf(logfile, "inl : %04x %08x\n", addr, val);
+#endif
+ return val;
}
/***********************************************************/
@@ -680,6 +712,34 @@
}
}
+#ifndef _WIN32
+
+#define RTC_FREQ 1024
+
+static int rtc_fd;
+
+static int start_rtc_timer(void)
+{
+ rtc_fd = open("/dev/rtc", O_RDONLY);
+ if (rtc_fd < 0)
+ return -1;
+ if (ioctl(rtc_fd, RTC_IRQP_SET, RTC_FREQ) < 0) {
+ fprintf(stderr, "Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal\n"
+ "error, but for better emulation accuracy either use a 2.6 host Linux kernel or\n"
+ "type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.\n");
+ goto fail;
+ }
+ if (ioctl(rtc_fd, RTC_PIE_ON, 0) < 0) {
+ fail:
+ close(rtc_fd);
+ return -1;
+ }
+ pit_min_timer_count = PIT_FREQ / RTC_FREQ;
+ return 0;
+}
+
+#endif
+
static void init_timers(void)
{
rt_clock = qemu_new_clock(QEMU_TIMER_REALTIME);
@@ -715,7 +775,7 @@
#endif
act.sa_handler = host_alarm_handler;
sigaction(SIGALRM, &act, NULL);
-
+
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 1000;
itv.it_value.tv_sec = 0;
@@ -724,8 +784,27 @@
/* we probe the tick duration of the kernel to inform the user if
the emulated kernel requested a too high timer frequency */
getitimer(ITIMER_REAL, &itv);
- pit_min_timer_count = ((uint64_t)itv.it_interval.tv_usec * PIT_FREQ) /
- 1000000;
+
+ if (itv.it_interval.tv_usec > 1000) {
+ /* try to use /dev/rtc to have a faster timer */
+ if (start_rtc_timer() < 0)
+ goto use_itimer;
+ /* disable itimer */
+ itv.it_interval.tv_sec = 0;
+ itv.it_interval.tv_usec = 0;
+ itv.it_value.tv_sec = 0;
+ itv.it_value.tv_usec = 0;
+ setitimer(ITIMER_REAL, &itv, NULL);
+
+ /* use the RTC */
+ sigaction(SIGIO, &act, NULL);
+ fcntl(rtc_fd, F_SETFL, O_ASYNC);
+ fcntl(rtc_fd, F_SETOWN, getpid());
+ } else {
+ use_itimer:
+ pit_min_timer_count = ((uint64_t)itv.it_interval.tv_usec *
+ PIT_FREQ) / 1000000;
+ }
}
#endif
}
