/**
* pdcspath_store - This function writes a path to stable storage.
* @entry: A pointer to an allocated pdcspath_entry.
*
* It can be used in two ways: either by passing it a preset devpath struct
* containing an already computed hardware path, or by passing it a device
* pointer, from which it'll find out the corresponding hardware path.
* For now we do not handle the case where there's an error in writing to the
* Stable Storage area, so you'd better not mess up the data :P
*
* This function expects to be called with @entry->rw_lock write-hold.
*/
static void
pdcspath_store(struct pdcspath_entry *entry)
{
struct device_path *devpath;
BUG_ON(!entry);
devpath = &entry->devpath;
/* We expect the caller to set the ready flag to 0 if the hardware
path struct provided is invalid, so that we know we have to fill it.
First case, we don't have a preset hwpath... */
if (!entry->ready) {
/* ...but we have a device, map it */
BUG_ON(!entry->dev);
device_to_hwpath(entry->dev, (struct hardware_path *)devpath);
}
/* else, we expect the provided hwpath to be valid. */
DPRINTK("%s: store: 0x%p, 0x%p, addr: 0x%lx\n", __func__,
entry, devpath, entry->addr);
/* addr, devpath and count must be word aligned */
if (pdc_stable_write(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) {
printk(KERN_ERR "%s: an error occured when writing to PDC.\n"
"It is likely that the Stable Storage data has been corrupted.\n"
"Please check it carefully upon next reboot.\n", __func__);
WARN_ON(1);
}
/* kobject is already registered */
entry->ready = 2;
DPRINTK("%s: device: 0x%p\n", __func__, entry->dev);
}
/**
* pdcs_osdep1_write - Stable Storage OS-Dependent data area 1 input.
* @buf: The input buffer to read from.
* @count: The number of bytes to be read.
*
* This can store 16 bytes of OS-Dependent data. We use a byte-by-byte
* write approach. It's up to userspace to deal with it when constructing
* its input buffer.
*/
static ssize_t pdcs_osdep1_write(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
u8 in[16];
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!buf || !count)
return -EINVAL;
if (unlikely(pdcs_osid != OS_ID_LINUX))
return -EPERM;
if (count > 16)
return -EMSGSIZE;
/* We'll use a local copy of buf */
memset(in, 0, 16);
memcpy(in, buf, count);
if (pdc_stable_write(PDCS_ADDR_OSD1, &in, sizeof(in)) != PDC_OK)
return -EIO;
return count;
}
static void
pdcspath_store(struct pdcspath_entry *entry)
{
struct device_path *devpath;
BUG_ON(!entry);
devpath = &entry->devpath;
if (!entry->ready) {
BUG_ON(!entry->dev);
device_to_hwpath(entry->dev, (struct hardware_path *)devpath);
}
DPRINTK("%s: store: 0x%p, 0x%p, addr: 0x%lx\n", __func__,
entry, devpath, entry->addr);
if (pdc_stable_write(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) {
printk(KERN_ERR "%s: an error occurred when writing to PDC.\n"
"It is likely that the Stable Storage data has been corrupted.\n"
"Please check it carefully upon next reboot.\n", __func__);
WARN_ON(1);
}
entry->ready = 2;
DPRINTK("%s: device: 0x%p\n", __func__, entry->dev);
}
/**
* pdcs_osdep2_write - Stable Storage OS-Dependent data area 2 input.
* @buf: The input buffer to read from.
* @count: The number of bytes to be read.
*
* This can store pdcs_size - 224 bytes of OS-Dependent data. We use a
* byte-by-byte write approach. It's up to userspace to deal with it when
* constructing its input buffer.
*/
static ssize_t pdcs_osdep2_write(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
unsigned long size;
unsigned short i;
u8 in[4];
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!buf || !count)
return -EINVAL;
if (unlikely(pdcs_size <= 224))
return -ENOSYS;
if (unlikely(pdcs_osid != OS_ID_LINUX))
return -EPERM;
size = pdcs_size - 224;
if (count > size)
return -EMSGSIZE;
/* We'll use a local copy of buf */
for (i=0; i<count; i+=4) {
memset(in, 0, 4);
memcpy(in, buf+i, (count-i < 4) ? count-i : 4);
if (unlikely(pdc_stable_write(PDCS_ADDR_OSD2 + i, &in,
sizeof(in)) != PDC_OK))
return -EIO;
}
return count;
}
static int __init parisc_init(void)
{
u32 osid = (OS_ID_LINUX << 16);
parisc_proc_mkdir();
parisc_init_resources();
do_device_inventory(); /* probe for hardware */
parisc_pdc_chassis_init();
/* set up a new led state on systems shipped LED State panel */
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BSTART);
/* tell PDC we're Linux. Nevermind failure. */
pdc_stable_write(0x40, &osid, sizeof(osid));
/* start with known state */
flush_cache_all_local();
flush_tlb_all_local(NULL);
processor_init();
#ifdef CONFIG_SMP
pr_info("CPU(s): %d out of %d %s at %d.%06d MHz online\n",
num_online_cpus(), num_present_cpus(),
#else
pr_info("CPU(s): 1 x %s at %d.%06d MHz\n",
#endif
boot_cpu_data.cpu_name,
boot_cpu_data.cpu_hz / 1000000,
boot_cpu_data.cpu_hz % 1000000 );
apply_alternatives_all();
parisc_setup_cache_timing();
/* These are in a non-obvious order, will fix when we have an iotree */
#if defined(CONFIG_IOSAPIC)
iosapic_init();
#endif
#if defined(CONFIG_IOMMU_SBA)
sba_init();
#endif
#if defined(CONFIG_PCI_LBA)
lba_init();
#endif
/* CCIO before any potential subdevices */
#if defined(CONFIG_IOMMU_CCIO)
ccio_init();
#endif
/*
* Need to register Asp & Wax before the EISA adapters for the IRQ
* regions. EISA must come before PCI to be sure it gets IRQ region
* 0.
*/
#if defined(CONFIG_GSC_LASI) || defined(CONFIG_GSC_WAX)
gsc_init();
#endif
#ifdef CONFIG_EISA
eisa_init();
#endif
#if defined(CONFIG_HPPB)
hppb_init();
#endif
#if defined(CONFIG_GSC_DINO)
dino_init();
#endif
#ifdef CONFIG_CHASSIS_LCD_LED
register_led_regions(); /* register LED port info in procfs */
#endif
return 0;
}