On Sun, Nov 14, 2010 at 08:41:37PM +0200, Michael S. Tsirkin wrote:
> On Sun, Nov 14, 2010 at 05:39:41PM +0200, Gleb Natapov wrote:
> >
> > Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
> > ---
> > hw/fw_cfg.c | 14 ++++++++++++++
> > hw/fw_cfg.h | 4 +++-
> > sysemu.h | 1 +
> > vl.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
> > 4 files changed, 69 insertions(+), 1 deletions(-)
> >
> > diff --git a/hw/fw_cfg.c b/hw/fw_cfg.c
> > index 7b9434f..f6a67db 100644
> > --- a/hw/fw_cfg.c
> > +++ b/hw/fw_cfg.c
> > @@ -53,6 +53,7 @@ struct FWCfgState {
> > FWCfgFiles *files;
> > uint16_t cur_entry;
> > uint32_t cur_offset;
> > + Notifier machine_ready;
> > };
> >
> > static void fw_cfg_write(FWCfgState *s, uint8_t value)
> > @@ -315,6 +316,15 @@ int fw_cfg_add_file(FWCfgState *s, const char *filename, uint8_t *data,
> > return 1;
> > }
> >
> > +static void fw_cfg_machine_ready(struct Notifier* n)
> > +{
> > + uint32_t len;
> > + char *bootindex = get_boot_devices_list(&len);
> > +
> > + fw_cfg_add_bytes(container_of(n, FWCfgState, machine_ready),
> > + FW_CFG_BOOTINDEX, (uint8_t*)bootindex, len);
> > +}
> > +
> > FWCfgState *fw_cfg_init(uint32_t ctl_port, uint32_t data_port,
> > target_phys_addr_t ctl_addr, target_phys_addr_t data_addr)
> > {
> > @@ -343,6 +353,10 @@ FWCfgState *fw_cfg_init(uint32_t ctl_port, uint32_t data_port,
> > fw_cfg_add_i16(s, FW_CFG_MAX_CPUS, (uint16_t)max_cpus);
> > fw_cfg_add_i16(s, FW_CFG_BOOT_MENU, (uint16_t)boot_menu);
> >
> > +
> > + s->machine_ready.notify = fw_cfg_machine_ready;
> > + qemu_add_machine_init_done_notifier(&s->machine_ready);
> > +
> > return s;
> > }
> >
> > diff --git a/hw/fw_cfg.h b/hw/fw_cfg.h
> > index 856bf91..4d61410 100644
> > --- a/hw/fw_cfg.h
> > +++ b/hw/fw_cfg.h
> > @@ -30,7 +30,9 @@
> >
> > #define FW_CFG_FILE_FIRST 0x20
> > #define FW_CFG_FILE_SLOTS 0x10
> > -#define FW_CFG_MAX_ENTRY (FW_CFG_FILE_FIRST+FW_CFG_FILE_SLOTS)
> > +#define FW_CFG_FILE_LAST_SLOT (FW_CFG_FILE_FIRST+FW_CFG_FILE_SLOTS)
> > +#define FW_CFG_BOOTINDEX (FW_CFG_FILE_LAST_SLOT + 1)
> > +#define FW_CFG_MAX_ENTRY FW_CFG_BOOTINDEX
> >
> > #define FW_CFG_WRITE_CHANNEL 0x4000
> > #define FW_CFG_ARCH_LOCAL 0x8000
> > diff --git a/sysemu.h b/sysemu.h
> > index c42f33a..38a20a3 100644
> > --- a/sysemu.h
> > +++ b/sysemu.h
> > @@ -196,4 +196,5 @@ void register_devices(void);
> >
> > void add_boot_device_path(int32_t bootindex, DeviceState *dev,
> > const char *suffix);
> > +char *get_boot_devices_list(uint32_t *size);
> > #endif
> > diff --git a/vl.c b/vl.c
> > index 918d988..cca1e76 100644
> > --- a/vl.c
> > +++ b/vl.c
> > @@ -735,6 +735,57 @@ void add_boot_device_path(int32_t bootindex, DeviceState *dev,
> > QTAILQ_INSERT_TAIL(&fw_boot_order, node, link);
> > }
> >
> > +/*
> > + * This function returns device list as an array in a below format:
> > + * +-----+-----+---------------+-----+---------------+--
> > + * | n | l1 | devpath1 | l2 | devpath2 | ...
> > + * +-----+-----+---------------+-----+---------------+--
>
> No one will ever want > 256 devices? Let's make it 4 byte or something.
>
More then 256 _boot_ devices. I think this is more then reasonable.
> > + * where:
> > + * n - a number of devise pathes (one byte)
> > + * l - length of following device path string (one byte)
>
> Might not fit: with pci we can have 256 nested buses.
Theoretically. But will it practically happen?
> How about simply null-terminating each path?
>
Will be harder for Seabios. I can use more then one byte for length, but
I tried to avoid endianess handling.
> > + * devpath - non-null terminated string of length l representing
> > + * one device path
> > + */
>
> Document return value + parameters as well?
>
Return value is documented above :)
> > +char *get_boot_devices_list(uint32_t *size)
> > +{
> > + FWBootEntry *i;
> > + uint32_t total = 1, c = 0;
> > + char *list = qemu_malloc(1);
> > +
> > + QTAILQ_FOREACH(i, &fw_boot_order, link) {
> > + char *devpath = NULL, *bootpath;
> > + int len;
> > +
> > + if (i->dev) {
> > + devpath = qdev_get_fw_dev_path(i->dev);
> > + assert(devpath);
> > + }
> > +
> > + if (i->suffix && devpath) {
> > + bootpath = qemu_malloc(strlen(devpath) + strlen(i->suffix) + 2);
> > + sprintf(bootpath, "%s/%s", devpath, i->suffix);
> > + qemu_free(devpath);
>
> devpath is allocated with strdup, not qemu_malloc,
> so I guess it should be freed with free?
There is code that do it like this all over qemu.
> Alternatively, let's add qemu_strdup
> Might be a good idea: fix error handling here and elsewhere.
>
> > + } else if (devpath) {
> > + bootpath = devpath;
> > + } else {
> > + bootpath = strdup(i->suffix);
> > + }
>
> assert(bootpath).
>
OK
> > +
> > + len = strlen(bootpath);
> > + list = qemu_realloc(list, total + len + 1);
> > + list[total++] = len;
> > + memcpy(&list[total], bootpath, len);
> > + total += len;
> > + c++;
> > + qemu_free(bootpath);
>
> Man, is this tricky.
>
Nah, not at all.
--
Gleb.
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