Add HPET emulation to qemu (v5)

index a2915f8..f6950ca 100644
@@ -945,6 +945,13 @@ void ioapic_set_irq(void *opaque, int vector, int level)
 {
     IOAPICState *s = opaque;
 
+    /* ISA IRQs map to GSI 1-1 except for IRQ0 which maps
+     * to GSI 2.  GSI maps to ioapic 1-1.  This is not
+     * the cleanest way of doing it but it should work. */
+
+    if (vector == 0)
+        vector = 2;
+
     if (vector >= 0 && vector < IOAPIC_NUM_PINS) {
         uint32_t mask = 1 << vector;
         uint64_t entry = s->ioredtbl[vector];

588 lines not on this page · raw message

85 lines not on this page · raw message

index 4813b03..1625787 100644
@@ -463,6 +463,27 @@ static void pit_reset(void *opaque)
     }
 }
 
+/* When HPET is operating in legacy mode, i8254 timer0 is disabled */
+void hpet_pit_disable(void) {
+    PITChannelState *s;
+    s = &pit_state.channels[0];
+    qemu_del_timer(s->irq_timer);
+}
+
+/* When HPET is reset or leaving legacy mode, it must reenable i8254 
+ * timer 0
+ */
+
+void hpet_pit_enable(void)
+{
+    PITState *pit = &pit_state;
+    PITChannelState *s;
+    s = &pit->channels[0];
+    s->mode = 3;
+    s->gate = 1;
+    pit_load_count(s, 0);
+}
+
 PITState *pit_init(int base, qemu_irq irq)
 {
     PITState *pit = &pit_state;

index 30bb044..a561230 100644
@@ -26,6 +26,7 @@
 #include "sysemu.h"
 #include "pc.h"
 #include "isa.h"
+#include "hpet_emul.h"
 
 //#define DEBUG_CMOS
 

@@ -70,6 +71,18 @@ struct RTCState {
     QEMUTimer *second_timer2;
 };
 
+static void rtc_irq_raise(qemu_irq irq) {
+    /* When HPET is operating in legacy mode, RTC interrupts are disabled 
+     * We block qemu_irq_raise, but not qemu_irq_lower, in case legacy
+     * mode is established while interrupt is raised. We want it to 
+     * be lowered in any case
+     */ 
+#if defined TARGET_I386 || defined TARGET_X86_64
+    if (!hpet_in_legacy_mode()) 
+#endif
+        qemu_irq_raise(irq);
+}
+
 static void rtc_set_time(RTCState *s);
 static void rtc_copy_date(RTCState *s);
 

@@ -79,8 +92,14 @@ static void rtc_timer_update(RTCState *s, int64_t current_time)
     int64_t cur_clock, next_irq_clock;
 
     period_code = s->cmos_data[RTC_REG_A] & 0x0f;
-    if (period_code != 0 &&
-        (s->cmos_data[RTC_REG_B] & REG_B_PIE)) {
+#if defined TARGET_I386 || defined TARGET_X86_64
+    /* disable periodic timer if hpet is in legacy mode, since interrupts are 
+     * disabled anyway.
+     */
+    if (period_code != 0 && (s->cmos_data[RTC_REG_B] & REG_B_PIE) && !hpet_in_legacy_mode()) {
+#else
+    if (period_code != 0 && (s->cmos_data[RTC_REG_B] & REG_B_PIE)) {
+#endif
         if (period_code <= 2)
             period_code += 7;
         /* period in 32 Khz cycles */

@@ -101,7 +120,7 @@ static void rtc_periodic_timer(void *opaque)
 
     rtc_timer_update(s, s->next_periodic_time);
     s->cmos_data[RTC_REG_C] |= 0xc0;
-    qemu_irq_raise(s->irq);
+    rtc_irq_raise(s->irq);
 }
 
 static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data)

@@ -320,14 +339,14 @@ static void rtc_update_second2(void *opaque)
              s->cmos_data[RTC_HOURS_ALARM] == s->current_tm.tm_hour)) {
 
             s->cmos_data[RTC_REG_C] |= 0xa0;
-            qemu_irq_raise(s->irq);
+            rtc_irq_raise(s->irq);
         }
     }
 
     /* update ended interrupt */
     if (s->cmos_data[RTC_REG_B] & REG_B_UIE) {
         s->cmos_data[RTC_REG_C] |= 0x90;
-        qemu_irq_raise(s->irq);
+        rtc_irq_raise(s->irq);
     }
 
     /* clear update in progress bit */

index 1486b68..36660a2 100644
@@ -33,6 +33,7 @@
 #include "boards.h"
 #include "console.h"
 #include "fw_cfg.h"
+#include "hpet_emul.h"
 
 /* output Bochs bios info messages */
 //#define DEBUG_BIOS

@@ -975,6 +976,9 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_size,
     }
     pit = pit_init(0x40, i8259[0]);
     pcspk_init(pit);
+    if (!no_hpet) {
+        hpet_init(i8259);
+    }
     if (pci_enabled) {
         pic_set_alt_irq_func(isa_pic, ioapic_set_irq, ioapic);
     }

index d64d8a6..cbaaa93 100644
@@ -95,6 +95,9 @@ i2c_bus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base,
 void piix4_smbus_register_device(SMBusDevice *dev, uint8_t addr);
 void acpi_bios_init(void);
 
+/* hpet.c */
+extern int no_hpet;
+
 /* pcspk.c */
 void pcspk_init(PITState *);
 int pcspk_audio_init(AudioState *, qemu_irq *pic);

index 22360fc..bab09d0 100644
@@ -251,6 +251,11 @@ static void do_info_name(void)
         term_printf("%s\n", qemu_name);
 }
 
+static void do_info_hpet(void)
+{
+    term_printf("HPET is %s by QEMU\n", (no_hpet) ? "disabled" : "enabled");
+}
+
 static void do_info_uuid(void)
 {
     term_printf(UUID_FMT "\n", qemu_uuid[0], qemu_uuid[1], qemu_uuid[2],

@@ -1506,6 +1511,8 @@ static const term_cmd_t info_cmds[] = {
       "", "show virtual to physical memory mappings", },
     { "mem", "", mem_info,
       "", "show the active virtual memory mappings", },
+    { "hpet", "", do_info_hpet,
+      "", "show state of HPET", },
 #endif
     { "jit", "", do_info_jit,
       "", "show dynamic compiler info", },

index 2cfe23d..1f043d1 100644
@@ -222,6 +222,7 @@ int usb_enabled = 0;
 int smp_cpus = 1;
 const char *vnc_display;
 int acpi_enabled = 1;
+int no_hpet = 0;
 int fd_bootchk = 1;
 int no_reboot = 0;
 int no_shutdown = 0;

@@ -3922,6 +3923,7 @@ static void help(int exitcode)
 #endif
 #ifdef TARGET_I386
            "-no-acpi        disable ACPI\n"
+           "-no-hpet        disable HPET\n"
 #endif
 #ifdef CONFIG_CURSES
            "-curses         use a curses/ncurses interface instead of SDL\n"

@@ -4033,6 +4035,7 @@ enum {
     QEMU_OPTION_smp,
     QEMU_OPTION_vnc,
     QEMU_OPTION_no_acpi,
+    QEMU_OPTION_no_hpet,
     QEMU_OPTION_curses,
     QEMU_OPTION_no_reboot,
     QEMU_OPTION_no_shutdown,

@@ -4146,6 +4149,7 @@ static const QEMUOption qemu_options[] = {
     /* temporary options */
     { "usb", 0, QEMU_OPTION_usb },
     { "no-acpi", 0, QEMU_OPTION_no_acpi },
+    { "no-hpet", 0, QEMU_OPTION_no_hpet },
     { "no-reboot", 0, QEMU_OPTION_no_reboot },
     { "no-shutdown", 0, QEMU_OPTION_no_shutdown },
     { "show-cursor", 0, QEMU_OPTION_show_cursor },

@@ -4981,6 +4985,9 @@ int main(int argc, char **argv)
             case QEMU_OPTION_no_acpi:
                 acpi_enabled = 0;
                 break;
+            case QEMU_OPTION_no_hpet:
+                no_hpet = 1;
+                break;
             case QEMU_OPTION_no_reboot:
                 no_reboot = 1;
                 break;