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Add function to encode device path into integer

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This function will encode the device path into 3
bytes of a dword which can be saved for debug.

It will be used by subsequent commit to store the
current device into CMOS for debugging BIOS hangs.

BUG=chrome-os-partner:19980
BRANCH=none
TEST=New code only, nothing uses it yet.

Change-Id: I3a5155ea53c8d280806e610a0f8998dbabe15f3c
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/58103
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Duncan Laurie 2013-06-10 09:59:17 -07:00 • committed by ChromeBot
commit cede29786b
2 changed files with 56 additions and 0 deletions
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55
src/device/device_util.c
View file

@ -158,6 +158,61 @@ struct device *dev_find_class(unsigned int class, struct device *from)
return from;
}
/**
* Encode the device path into 3 bytes for logging to CMOS.
*
* @param dev The device path to encode.
* @return Device path encoded into lower 3 bytes of dword.
*/
u32 dev_path_encode(device_t dev)
{
u32 ret;
if (!dev)
return 0;
/* Store the device type in 3rd byte. */
ret = dev->path.type << 16;
/* Encode the device specific path in the low word. */
switch (dev->path.type) {
case DEVICE_PATH_ROOT:
break;
case DEVICE_PATH_PCI:
ret |= dev->bus->secondary << 8 | dev->path.pci.devfn;
break;
case DEVICE_PATH_PNP:
ret |= dev->path.pnp.port << 8 | dev->path.pnp.device;
break;
case DEVICE_PATH_I2C:
ret |= dev->bus->secondary << 8 | dev->path.pnp.device;
break;
case DEVICE_PATH_APIC:
ret |= dev->path.apic.apic_id;
break;
case DEVICE_PATH_DOMAIN:
ret |= dev->path.domain.domain;
break;
case DEVICE_PATH_CPU_CLUSTER:
ret |= dev->path.cpu_cluster.cluster;
break;
case DEVICE_PATH_CPU:
ret |= dev->path.cpu.id;
break;
case DEVICE_PATH_CPU_BUS:
ret |= dev->path.cpu_bus.id;
break;
case DEVICE_PATH_IOAPIC:
ret |= dev->path.ioapic.ioapic_id;
break;
case DEVICE_PATH_NONE:
default:
break;
}
return ret;
}
/*
* Warning: This function uses a static buffer. Don't call it more than once
* from the same print statement!

1
src/include/device/device.h
View file

@ -143,6 +143,7 @@ void enumerate_static_device(void);
void enumerate_static_devices(void);
const char *dev_name(device_t dev);
const char *dev_path(device_t dev);
u32 dev_path_encode(device_t dev);
const char *bus_path(struct bus *bus);
void dev_set_enabled(device_t dev, int enable);
void disable_children(struct bus *bus);