There is code indentation errors in my previous post, I am sorry for
that, please review this post.
The qemu-kvm could boot from SCSI disk image by utilizing seabios, this
patch ported codes
from qemu-kvm to let upstream qemu to support booting from SCSI disk image.
Add 'boot=on' option to qemu command line like following,
qemu-system-x86_64 -drive file=scsi-disk.img,if=scsi,boot=on
Signed-off-by: Shan Hai <haishan....@gmail.com>
---
Makefile.target | 1 +
blockdev.c | 13 ++++++
blockdev.h | 2 +
hw/extboot.c | 123
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
hw/pc.c | 17 ++++++++
hw/pc.h | 4 ++
qemu-config.c | 4 ++
7 files changed, 164 insertions(+), 0 deletions(-)
create mode 100644 hw/extboot.c
diff --git a/Makefile.target b/Makefile.target
index c8281e9..abba79c 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -199,6 +199,7 @@ obj-i386-y += mc146818rtc.o i8259.o pc.o
obj-i386-y += cirrus_vga.o apic.o ioapic.o piix_pci.o
obj-i386-y += vmmouse.o vmport.o hpet.o applesmc.o
obj-i386-y += device-hotplug.o pci-hotplug.o smbios.o wdt_ib700.o
+obj-i386-y += extboot.o
obj-i386-y += debugcon.o multiboot.o
obj-i386-y += pc_piix.o
diff --git a/blockdev.c b/blockdev.c
index 01e402b..78c286c 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -15,6 +15,8 @@
#include "qemu-config.h"
#include "sysemu.h"
+DriveInfo *extboot_drive = NULL;
+
static QTAILQ_HEAD(drivelist, DriveInfo) drives =
QTAILQ_HEAD_INITIALIZER(drives);
/*
@@ -150,6 +152,7 @@ DriveInfo *drive_init(QemuOpts *opts, int
default_to_scsi, int *fatal_error)
int on_read_error, on_write_error;
const char *devaddr;
DriveInfo *dinfo;
+ int is_extboot = 0;
int snapshot = 0;
int ret;
@@ -311,6 +314,12 @@ DriveInfo *drive_init(QemuOpts *opts, int
default_to_scsi, int *fatal_error)
}
}
+ is_extboot = qemu_opt_get_bool(opts, "boot", 0);
+ if (is_extboot && extboot_drive) {
+ fprintf(stderr, "qemu: two bootable drives specified\n");
+ return NULL;
+ }
+
on_write_error = BLOCK_ERR_STOP_ENOSPC;
if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
type != IF_NONE) {
@@ -421,6 +430,10 @@ DriveInfo *drive_init(QemuOpts *opts, int
default_to_scsi, int *fatal_error)
strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
QTAILQ_INSERT_TAIL(&drives, dinfo, next);
+ if (is_extboot) {
+ extboot_drive = dinfo;
+ }
+
bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
switch(type) {
diff --git a/blockdev.h b/blockdev.h
index 37f3a01..e707b87 100644
--- a/blockdev.h
+++ b/blockdev.h
@@ -59,4 +59,6 @@ int do_block_set_passwd(Monitor *mon, const QDict
*qdict, QObject **ret_data);
int do_change_block(Monitor *mon, const char *device,
const char *filename, const char *fmt);
+extern DriveInfo *extboot_drive;
+
#endif
diff --git a/hw/extboot.c b/hw/extboot.c
new file mode 100644
index 0000000..8ada21b
--- /dev/null
+++ b/hw/extboot.c
@@ -0,0 +1,123 @@
+/*
+ * Extended boot option ROM support.
+ *
+ * Copyright IBM, Corp. 2007
+ *
+ * Authors:
+ * Anthony Liguori <aligu...@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "hw.h"
+#include "pc.h"
+#include "isa.h"
+#include "block.h"
+
+/* Extended Boot ROM suport */
+
+union extboot_cmd
+{
+ uint16_t type;
+ struct {
+ uint16_t type;
+ uint16_t cylinders;
+ uint16_t heads;
+ uint16_t sectors;
+ uint64_t nb_sectors;
+ } query_geometry;
+ struct {
+ uint16_t type;
+ uint16_t nb_sectors;
+ uint16_t segment;
+ uint16_t offset;
+ uint64_t sector;
+ } xfer;
+};
+
+static void get_translated_chs(BlockDriverState *bs, int *c, int *h,
int *s)
+{
+ bdrv_get_geometry_hint(bs, c, h, s);
+
+ if (*c <= 1024) {
+ *c >>= 0;
+ *h <<= 0;
+ } else if (*c <= 2048) {
+ *c >>= 1;
+ *h <<= 1;
+ } else if (*c <= 4096) {
+ *c >>= 2;
+ *h <<= 2;
+ } else if (*c <= 8192) {
+ *c >>= 3;
+ *h <<= 3;
+ } else {
+ *c >>= 4;
+ *h <<= 4;
+ }
+
+ /* what is the correct algorithm for this?? */
+ if (*h == 256) {
+ *h = 255;
+ *c = *c + 1;
+ }
+}
+
+static void extboot_write_cmd(void *opaque, uint32_t addr, uint32_t value)
+{
+ union extboot_cmd cmd;
+ BlockDriverState *bs = opaque;
+ int cylinders, heads, sectors, err;
+ uint64_t nb_sectors;
+ target_phys_addr_t pa = 0;
+ int blen = 0;
+ void *buf = NULL;
+
+ cpu_physical_memory_read((value & 0xFFFF) << 4, (uint8_t *)&cmd,
+ sizeof(cmd));
+
+ if (cmd.type == 0x01 || cmd.type == 0x02) {
+ pa = cmd.xfer.segment * 16 + cmd.xfer.offset;
+ blen = cmd.xfer.nb_sectors * 512;
+ buf = qemu_memalign(512, blen);
+ }
+
+ switch (cmd.type) {
+ case 0x00:
+ get_translated_chs(bs, &cylinders, &heads, §ors);
+ bdrv_get_geometry(bs, &nb_sectors);
+ cmd.query_geometry.cylinders = cylinders;
+ cmd.query_geometry.heads = heads;
+ cmd.query_geometry.sectors = sectors;
+ cmd.query_geometry.nb_sectors = nb_sectors;
+ break;
+ case 0x01:
+ err = bdrv_read(bs, cmd.xfer.sector, buf, cmd.xfer.nb_sectors);
+ if (err)
+ printf("Read failed\n");
+
+ cpu_physical_memory_write(pa, buf, blen);
+
+ break;
+ case 0x02:
+ cpu_physical_memory_read(pa, buf, blen);
+
+ err = bdrv_write(bs, cmd.xfer.sector, buf, cmd.xfer.nb_sectors);
+ if (err)
+ printf("Write failed\n");
+
+ break;
+ }
+
+ cpu_physical_memory_write((value & 0xFFFF) << 4, (uint8_t *)&cmd,
+ sizeof(cmd));
+ if (buf)
+ qemu_free(buf);
+}
+
+void extboot_init(BlockDriverState *bs)
+{
+ register_ioport_write(0x405, 1, 2, extboot_write_cmd, bs);
+}
diff --git a/hw/pc.c b/hw/pc.c
index 58dea57..88f43aa 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -54,6 +54,7 @@
#endif
#define BIOS_FILENAME "bios.bin"
+#define EXTBOOT_FILENAME "extboot.bin"
#define PC_MAX_BIOS_SIZE (4 * 1024 * 1024)
@@ -953,6 +954,10 @@ void pc_memory_init(ram_addr_t ram_size,
isa_bios_size,
(bios_offset + bios_size -
isa_bios_size) | IO_MEM_ROM);
+ if (extboot_drive) {
+ option_rom[nb_option_roms++] = qemu_strdup(EXTBOOT_FILENAME);
+ }
+
option_rom_offset = qemu_ram_alloc(NULL, "pc.rom", PC_ROM_SIZE);
cpu_register_physical_memory(PC_ROM_MIN_VGA, PC_ROM_SIZE,
option_rom_offset);
@@ -1074,4 +1079,16 @@ void pc_pci_device_init(PCIBus *pci_bus)
for (bus = 0; bus <= max_bus; bus++) {
pci_create_simple(pci_bus, -1, "lsi53c895a");
}
+
+ if (extboot_drive) {
+ DriveInfo *info = extboot_drive;
+ int cyls, heads, secs;
+
+ if (info->type != IF_IDE && info->type != IF_VIRTIO) {
+ bdrv_guess_geometry(info->bdrv, &cyls, &heads, &secs);
+ bdrv_set_geometry_hint(info->bdrv, cyls, heads, secs);
+ }
+
+ extboot_init(info->bdrv);
+ }
}
diff --git a/hw/pc.h b/hw/pc.h
index 63b0249..61882db 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -167,6 +167,10 @@ void isa_cirrus_vga_init(void);
void isa_ne2000_init(int base, int irq, NICInfo *nd);
+/* extboot.c */
+
+void extboot_init(BlockDriverState *bs);
+
/* e820 types */
#define E820_RAM 1
#define E820_RESERVED 2
diff --git a/qemu-config.c b/qemu-config.c
index 95abe61..08ee553 100644
--- a/qemu-config.c
+++ b/qemu-config.c
@@ -79,6 +79,10 @@ QemuOptsList qemu_drive_opts = {
},{
.name = "readonly",
.type = QEMU_OPT_BOOL,
+ },{
+ .name = "boot",
+ .type = QEMU_OPT_BOOL,
+ .help = "make this a boot drive",
},
{ /* end if list */ }
},
--
1.7.0.4
