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Re: [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI on i386 |
Date: |
Wed, 8 Jan 2014 22:38:21 +0200 |
On Wed, Jan 08, 2014 at 03:02:17PM -0500, Gabriel L. Somlo wrote:
> Add i386 command line option "-no-fdc", which allows guests to omit the
> configuration of a floppy controller. Applies on top of my previous patch
> titled "Add DSDT node for AppleSMC"
>
> Signed-off-by: Gabriel Somlo <address@hidden>
> ---
> On Sun, Dec 22, 2013 at 11:21:00PM +0100, Laszlo Ersek wrote:
> >I guess the "by the book" solution would be to really stop the FDC from
> >being emulated when the AppleSMC is present
>
> On Wed, Dec 25, 2013 at 09:20:55PM +0200, Michael S. Tsirkin wrote:
> >On Wed, Dec 25, 2013 at 08:11:56PM +0100, Alexander Graf wrote:
> >>Speaking of which, does the q35 even have an fdc?
> >I don't think it does but this device seems to be supported with piix as well
>
> This patch should be the first step to resolve all these issues.
> If/when we make it possible to turn off the FDC, we can then choose
> to leave it out altogether on Q35, and/or to throw an error if both
> it and the AppleSMC are turned on, or have the presence of the
> AppleSMC automatically force the FDC to be turned off, etc.
>
> Please let me know what you all think.
>
> Thanks,
> Gabriel
>
> include/hw/i386/pc.h | 3 +++
> qemu-options.hx | 8 ++++++++
> vl.c | 4 ++++
> hw/i386/pc.c | 10 +++++++---
> hw/i386/acpi-dsdt.dsl | 2 +-
> hw/i386/q35-acpi-dsdt.dsl | 4 ++--
> hw/i386/acpi-dsdt-isa.dsl | 11 +++--------
> hw/i386/acpi-build.c | 8 ++++++++
> 8 files changed, 36 insertions(+), 14 deletions(-)
>
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index 24eb3de..5226a79 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -173,6 +173,9 @@ void piix4_smbus_register_device(SMBusDevice *dev,
> uint8_t addr);
> /* hpet.c */
> extern int no_hpet;
>
> +/* fdc.c */
> +extern int no_fdc;
> +
> /* piix_pci.c */
> struct PCII440FXState;
> typedef struct PCII440FXState PCII440FXState;
> diff --git a/qemu-options.hx b/qemu-options.hx
> index bcfe9ea..396a028 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -1297,6 +1297,14 @@ STEXI
> Disable HPET support.
> ETEXI
>
> +DEF("no-fdc", 0, QEMU_OPTION_no_fdc,
> + "-no-fdc disable FDC\n", QEMU_ARCH_I386)
> +STEXI
> address@hidden -no-fdc
> address@hidden -no-fdc
> +Disable FDC support.
> +ETEXI
> +
> DEF("acpitable", HAS_ARG, QEMU_OPTION_acpitable,
> "-acpitable
> [sig=str][,rev=n][,oem_id=str][,oem_table_id=str][,oem_rev=n][,asl_compiler_id=str][,asl_compiler_rev=n][,{data|file}=file1[:file2]...]\n"
> " ACPI table description\n", QEMU_ARCH_I386)
> diff --git a/vl.c b/vl.c
> index 7511e70..4a461a2 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -214,6 +214,7 @@ const char *vnc_display;
> #endif
> int acpi_enabled = 1;
> int no_hpet = 0;
> +int no_fdc = 0;
> int fd_bootchk = 1;
> static int no_reboot;
> int no_shutdown = 0;
> @@ -3576,6 +3577,9 @@ int main(int argc, char **argv, char **envp)
> case QEMU_OPTION_no_hpet:
> no_hpet = 1;
> break;
> + case QEMU_OPTION_no_fdc:
> + no_fdc = 1;
> + break;
> case QEMU_OPTION_balloon:
> if (balloon_parse(optarg) < 0) {
> fprintf(stderr, "Unknown -balloon argument %s\n",
> optarg);
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index 3cd8f38..ba3bd3d 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1353,10 +1353,14 @@ void pc_basic_device_init(ISABus *isa_bus, qemu_irq
> *gsi,
> cpu_exit_irq = qemu_allocate_irqs(cpu_request_exit, NULL, 1);
> DMA_init(0, cpu_exit_irq);
>
> - for(i = 0; i < MAX_FD; i++) {
> - fd[i] = drive_get(IF_FLOPPY, 0, i);
> + if (!no_fdc) {
> + for(i = 0; i < MAX_FD; i++) {
> + fd[i] = drive_get(IF_FLOPPY, 0, i);
> + }
> + *floppy = fdctrl_init_isa(isa_bus, fd);
> + } else {
> + *floppy = NULL;
> }
> - *floppy = fdctrl_init_isa(isa_bus, fd);
> }
>
> void pc_nic_init(ISABus *isa_bus, PCIBus *pci_bus)
> diff --git a/hw/i386/acpi-dsdt.dsl b/hw/i386/acpi-dsdt.dsl
> index b87c6e0..b608abf 100644
> --- a/hw/i386/acpi-dsdt.dsl
> +++ b/hw/i386/acpi-dsdt.dsl
> @@ -110,11 +110,11 @@ DefinitionBlock (
> , 3,
> CBEN, 1, // COM2
> }
> - Name(FDEN, 1)
> }
> }
>
> #define DSDT_APPLESMC_STA piix_dsdt_applesmc_sta
> +#define DSDT_FDC_STA piix_dsdt_fdc_sta
> #include "acpi-dsdt-isa.dsl"
>
>
> diff --git a/hw/i386/q35-acpi-dsdt.dsl b/hw/i386/q35-acpi-dsdt.dsl
> index 12ff544..55756d8 100644
> --- a/hw/i386/q35-acpi-dsdt.dsl
> +++ b/hw/i386/q35-acpi-dsdt.dsl
> @@ -165,13 +165,13 @@ DefinitionBlock (
> Field(LPCE, AnyAcc, NoLock, Preserve) {
> CAEN, 1,
> CBEN, 1,
> - LPEN, 1,
> - FDEN, 1
> + LPEN, 1
> }
> }
> }
>
> #define DSDT_APPLESMC_STA q35_dsdt_applesmc_sta
> +#define DSDT_FDC_STA q35_dsdt_fdc_sta
> #include "acpi-dsdt-isa.dsl"
>
>
> diff --git a/hw/i386/acpi-dsdt-isa.dsl b/hw/i386/acpi-dsdt-isa.dsl
> index 46942c1..747c3df 100644
> --- a/hw/i386/acpi-dsdt-isa.dsl
> +++ b/hw/i386/acpi-dsdt-isa.dsl
> @@ -60,14 +60,9 @@ Scope(\_SB.PCI0.ISA) {
>
> Device(FDC0) {
> Name(_HID, EisaId("PNP0700"))
> - Method(_STA, 0, NotSerialized) {
> - Store(FDEN, Local0)
> - If (LEqual(Local0, 0)) {
> - Return (0x00)
> - } Else {
> - Return (0x0F)
> - }
> - }
> + /* _STA will be patched to 0x0F if the FDC is present */
> + ACPI_EXTRACT_NAME_WORD_CONST DSDT_FDC_STA
> + Name(_STA, 0xFF00)
I'm not sure why this is WORD. Spec says bits 0-4 have meaning bits up
to 31 are cleared. So should not this be either dword (to make all
32 bits explicit) or byte (to make it small)?
> Name(_CRS, ResourceTemplate() {
> IO(Decode16, 0x03F2, 0x03F2, 0x00, 0x04)
> IO(Decode16, 0x03F7, 0x03F7, 0x00, 0x01)
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 30bfcd2..ff0f93e 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -82,6 +82,7 @@ typedef struct AcpiMiscInfo {
> static void acpi_get_dsdt(AcpiMiscInfo *info)
> {
> unsigned short applesmc_sta_val, *applesmc_sta_off;
> + unsigned short fdc_sta_val, *fdc_sta_off;
> Object *piix = piix4_pm_find();
> Object *lpc = ich9_lpc_find();
> assert(!!piix != !!lpc);
> @@ -90,13 +91,20 @@ static void acpi_get_dsdt(AcpiMiscInfo *info)
> info->dsdt_code = AcpiDsdtAmlCode;
> info->dsdt_size = sizeof AcpiDsdtAmlCode;
> applesmc_sta_off = piix_dsdt_applesmc_sta;
> + fdc_sta_off = piix_dsdt_fdc_sta;
> }
> if (lpc) {
> info->dsdt_code = Q35AcpiDsdtAmlCode;
> info->dsdt_size = sizeof Q35AcpiDsdtAmlCode;
> applesmc_sta_off = q35_dsdt_applesmc_sta;
> + fdc_sta_off = q35_dsdt_fdc_sta;
> }
>
> + /* Patch in appropriate value for FDC _STA */
> + fdc_sta_val = no_fdc ? 0x00 : 0x0F;
> + *(uint16_t *)(info->dsdt_code + *fdc_sta_off) =
> + cpu_to_le16(fdc_sta_val);
> +
> /* Patch in appropriate value for AppleSMC _STA */
> applesmc_sta_val = applesmc_find() ? 0x0b : 0x00;
> *(uint16_t *)(info->dsdt_code + *applesmc_sta_off) =
> --
> 1.8.1.4
- [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI on i386, Gabriel L. Somlo, 2014/01/08
- Re: [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI on i386,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI on i386, Paolo Bonzini, 2014/01/08
- Re: [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI on i386, Gabriel L. Somlo, 2014/01/08
- Re: [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI on i386, Alexander Graf, 2014/01/08
- Re: [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI on i386, Michael S. Tsirkin, 2014/01/08
- Re: [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI on i386, Gabriel L. Somlo, 2014/01/09
- Re: [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI on i386, Paolo Bonzini, 2014/01/09
- Re: [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI on i386, Michael S. Tsirkin, 2014/01/09
- Re: [Qemu-devel] [PATCH] Add option to disable FDC from ISA bus and ACPI on i386, Gabriel L. Somlo, 2014/01/09