[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v8 4/4] i386: populate floppy drive information in D
From: |
Roman Kagan |
Subject: |
[Qemu-devel] [PATCH v8 4/4] i386: populate floppy drive information in DSDT |
Date: |
Wed, 17 Feb 2016 21:25:33 +0300 |
On x86-based systems Linux determines the presence and the type of
floppy drives via a query of a CMOS field. So does SeaBIOS when
populating the return data for int 0x13 function 0x08.
However Windows doesn't do it. Instead, it requests this information
from BIOS via int 0x13/0x08 or through ACPI objects _FDE (Floppy Drive
Enumerate) and _FDI (Floppy Drive Information) of the floppy controller
object. On UEFI systems only ACPI-based detection is supported.
QEMU doesn't provide those objects in its ACPI tables and as a result
floppy drives are invisible to Windows on UEFI/OVMF.
This patch adds those objects to the floppy controller in DSDT,
populating them with the information from respective QEMU objects.
Signed-off-by: Roman Kagan <address@hidden>
Cc: Igor Mammedov <address@hidden>
Cc: "Michael S. Tsirkin" <address@hidden>
Cc: Marcel Apfelbaum <address@hidden>
Cc: John Snow <address@hidden>
Cc: Laszlo Ersek <address@hidden>
Cc: Kevin O'Connor <address@hidden>
---
changes since v7:
- use drive max c,h,s rather than the current diskette geometry
- better document the changes in the comments
hw/i386/acpi-build.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 66 insertions(+), 3 deletions(-)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 0213ccf..02bffb2 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -37,6 +37,7 @@
#include "hw/acpi/bios-linker-loader.h"
#include "hw/loader.h"
#include "hw/isa/isa.h"
+#include "hw/block/fdc.h"
#include "hw/acpi/memory_hotplug.h"
#include "hw/mem/nvdimm.h"
#include "sysemu/tpm.h"
@@ -1227,11 +1228,60 @@ static void build_hpet_aml(Aml *table)
aml_append(table, scope);
}
-static Aml *build_fdc_device_aml(void)
+static Aml *build_fdinfo_aml(int idx, FloppyDriveType type)
{
+ Aml *dev, *fdi;
+ uint8_t maxc, maxh, maxs;
+
+ isa_fdc_get_drive_max_chs(type, &maxc, &maxh, &maxs);
+
+ dev = aml_device("FLP%c", 'A' + idx);
+
+ aml_append(dev, aml_name_decl("_ADR", aml_int(idx)));
+
+ fdi = aml_package(16);
+ aml_append(fdi, aml_int(idx)); /* Drive Number */
+ aml_append(fdi,
+ aml_int(cmos_get_fd_drive_type(type))); /* Device Type */
+ /*
+ * the values below are the limits of the drive, and are thus independent
+ * of the inserted media
+ */
+ aml_append(fdi, aml_int(maxc)); /* Maximum Cylinder Number */
+ aml_append(fdi, aml_int(maxs)); /* Maximum Sector Number */
+ aml_append(fdi, aml_int(maxh)); /* Maximum Head Number */
+ /*
+ * SeaBIOS returns the below values for int 0x13 func 0x08 regardless of
+ * the drive type, so shall we
+ */
+ aml_append(fdi, aml_int(0xAF)); /* disk_specify_1 */
+ aml_append(fdi, aml_int(0x02)); /* disk_specify_2 */
+ aml_append(fdi, aml_int(0x25)); /* disk_motor_wait */
+ aml_append(fdi, aml_int(0x02)); /* disk_sector_siz */
+ aml_append(fdi, aml_int(0x12)); /* disk_eot */
+ aml_append(fdi, aml_int(0x1B)); /* disk_rw_gap */
+ aml_append(fdi, aml_int(0xFF)); /* disk_dtl */
+ aml_append(fdi, aml_int(0x6C)); /* disk_formt_gap */
+ aml_append(fdi, aml_int(0xF6)); /* disk_fill */
+ aml_append(fdi, aml_int(0x0F)); /* disk_head_sttl */
+ aml_append(fdi, aml_int(0x08)); /* disk_motor_strt */
+
+ aml_append(dev, aml_name_decl("_FDI", fdi));
+ return dev;
+}
+
+static Aml *build_fdc_device_aml(ISADevice *fdc)
+{
+ int i;
Aml *dev;
Aml *crs;
+#define ACPI_FDE_MAX_FD 4
+ uint32_t fde_buf[5] = {
+ 0, 0, 0, 0, /* presence of floppy drives #0 - #3 */
+ cpu_to_le32(2) /* tape presence (2 == never present) */
+ };
+
dev = aml_device("FDC0");
aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0700")));
@@ -1243,6 +1293,17 @@ static Aml *build_fdc_device_aml(void)
aml_dma(AML_COMPATIBILITY, AML_NOTBUSMASTER, AML_TRANSFER8, 2));
aml_append(dev, aml_name_decl("_CRS", crs));
+ for (i = 0; i < MIN(MAX_FD, ACPI_FDE_MAX_FD); i++) {
+ FloppyDriveType type = isa_fdc_get_drive_type(fdc, i);
+
+ if (type < FLOPPY_DRIVE_TYPE_NONE) {
+ fde_buf[i] = cpu_to_le32(1); /* drive present */
+ aml_append(dev, build_fdinfo_aml(i, type));
+ }
+ }
+ aml_append(dev, aml_name_decl("_FDE",
+ aml_buffer(sizeof(fde_buf), (uint8_t *)fde_buf)));
+
return dev;
}
@@ -1387,13 +1448,15 @@ static Aml *build_com_device_aml(uint8_t uid)
static void build_isa_devices_aml(Aml *table)
{
+ ISADevice *fdc = pc_find_fdc0();
+
Aml *scope = aml_scope("_SB.PCI0.ISA");
aml_append(scope, build_rtc_device_aml());
aml_append(scope, build_kbd_device_aml());
aml_append(scope, build_mouse_device_aml());
- if (pc_find_fdc0()) {
- aml_append(scope, build_fdc_device_aml());
+ if (fdc) {
+ aml_append(scope, build_fdc_device_aml(fdc));
}
aml_append(scope, build_lpt_device_aml());
aml_append(scope, build_com_device_aml(1));
--
2.5.0
[Qemu-devel] [PATCH v8 4/4] i386: populate floppy drive information in DSDT,
Roman Kagan <=
[Qemu-devel] [PATCH v8 1/4] i386/acpi: make floppy controller object dynamic, Roman Kagan, 2016/02/17