[Qemu-devel] Re: [PATCH] Add ACPI power button emulation

[Gleb Natapov]

On Thu, Apr 30, 2009 at 12:26:55PM +0200, Jan Kiszka wrote:
> Gleb Natapov wrote:
> > Signed-off-by: Gleb Natapov <address@hidden>
> > diff --git a/hw/acpi.c b/hw/acpi.c
> > index 53c1fec..6141522 100644
> > --- a/hw/acpi.c
> > +++ b/hw/acpi.c
> > @@ -752,6 +752,15 @@ void qemu_system_device_hot_add(int bus, int slot, int 
> > state)
> >      }
> >  }
> >  
> > +void qemu_press_power_button(void)
> > +{
> > +    gpe.sts |= (1 << 8);
> > +    if (gpe.en & (1 << 8)) {
> > +        qemu_set_irq(pm_state->irq, 1);
> > +        qemu_set_irq(pm_state->irq, 0);
> > +    }
> > +}
> > +
> >  struct acpi_table_header
> >  {
> >      char signature [4];    /* ACPI signature (4 ASCII characters) */
> > diff --git a/monitor.c b/monitor.c
> > index b33fea1..35202aa 100644
> > --- a/monitor.c
> > +++ b/monitor.c
> > @@ -1211,6 +1211,11 @@ static void do_system_reset(Monitor *mon)
> >      qemu_system_reset_request();
> >  }
> >  
> > +static void do_press_pwrb(Monitor *mon)
> > +{
> > +    qemu_press_power_button();
> > +}
> > +
> >  static void do_system_powerdown(Monitor *mon)
> >  {
> >      qemu_system_powerdown_request();
> > @@ -1733,6 +1738,7 @@ static const mon_cmd_t mon_cmds[] = {
> >  #if defined(TARGET_I386)
> >      { "nmi", "i", do_inject_nmi,
> >        "cpu", "inject an NMI on the given CPU", },
> > +    { "press_power_button", "", do_press_pwrb, "", "press power button" },
> 
> Dumb question: Why do we need a new monitor command? In qemu-kvm, I can
> currently issue a power button event via system_powerdown (while this
> command has currently no effect in qemu). Why not reuse it? Or what is
> the job of system_powerdown when ACPI is present?
> 
Actually this is not a dump question :) If there is no advantage to use
ACPI for power button (and I don't know if there is) better leave it
as is. And patch bellow should make system_powerdown work on qemu too.


Enable power button even generation.

Signed-off-by: Gleb Natapov <address@hidden>
diff --git a/pc-bios/bios-pq/0015_enable-power-button-even-generation.patch 
b/pc-bios/bios-pq/0015_enable-power-button-even-generation.patch
new file mode 100644
index 0000000..96cc2b2
--- /dev/null
+++ b/pc-bios/bios-pq/0015_enable-power-button-even-generation.patch
@@ -0,0 +1,17 @@
+Enable power button event generation.
+
+diff --git a/bios/rombios32.c b/bios/rombios32.c
+index 81e3bad..9986531 100644
+--- a/bios/rombios32.c
++++ b/bios/rombios32.c
+@@ -1767,8 +1767,8 @@ void acpi_bios_init(void)
+     fadt->plvl3_lat = cpu_to_le16(0xfff); // C3 state not supported
+     fadt->gpe0_blk = cpu_to_le32(0xafe0);
+     fadt->gpe0_blk_len = 4;
+-    /* WBINVD + PROC_C1 + PWR_BUTTON + SLP_BUTTON + FIX_RTC */
+-    fadt->flags = cpu_to_le32((1 << 0) | (1 << 2) | (1 << 4) | (1 << 5) | (1 
<< 6));
++    /* WBINVD + PROC_C1 + SLP_BUTTON + FIX_RTC */
++    fadt->flags = cpu_to_le32((1 << 0) | (1 << 2) | (1 << 5) | (1 << 6));
+     acpi_build_table_header((struct acpi_table_header *)fadt, "FACP",
+                             sizeof(*fadt), 1);
+ 
diff --git a/pc-bios/bios-pq/series b/pc-bios/bios-pq/series
index fdef179..aa5a375 100644
--- a/pc-bios/bios-pq/series
+++ b/pc-bios/bios-pq/series
@@ -12,3 +12,4 @@
 0012-load-smbios-entries-and-files-from-qemu.patch
 0013_fix-non-acpi-timer-interrupt-routing.patch
 0014_add-srat-acpi-table-support.patch
+0015_enable-power-button-even-generation.patch
--
                        Gleb.