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ahci: make port enumeration independent from port count

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fixes #2522
This commit is contained in:
Sebastian Sumpf 2017-09-17 11:15:26 +02:00 committed by Christian Helmuth
parent 6bfd4f4276
commit ff800af820
1 changed files with 24 additions and 10 deletions
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34
repos/os/src/drivers/ahci/ahci.cc
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@ -95,6 +95,19 @@ struct Ahci
platform_hba.ack_irq();
}
/*
* Least significant bit
*/
unsigned lsb(unsigned bits) const
{
for (unsigned i = 0; i < 32; i++)
if (bits & (1u << i)) {
return i;
}
return 0;
}
void info()
{
using Genode::log;
@ -116,38 +129,39 @@ struct Ahci
for (unsigned i = 0; i < hba.port_count(); i++) {
/* check if port is implemented */
if (!(available & (1U << i)))
continue;
if (!available) break;
unsigned index = lsb(available);
available ^= (1u << index);
bool enabled = false;
switch (Port_base(i, hba).read<Port_base::Sig>()) {
switch (Port_base(index, hba).read<Port_base::Sig>()) {
case ATA_SIG:
try {
ports[i] = new (&alloc)
ports[index] = new (&alloc)
Ata_driver(alloc, ram, root, ready_count, rm, hba,
platform_hba, i, device_identified);
platform_hba, index, device_identified);
enabled = true;
} catch (...) { }
log("\t\t#", i, ":", enabled ? " ATA" : " off (ATA)");
log("\t\t#", index, ":", enabled ? " ATA" : " off (ATA)");
break;
case ATAPI_SIG:
case ATAPI_SIG_QEMU:
if (enable_atapi)
try {
ports[i] = new (&alloc)
ports[index] = new (&alloc)
Atapi_driver(ram, root, ready_count, rm, hba,
platform_hba, i);
platform_hba, index);
enabled = true;
} catch (...) { }
log("\t\t#", i, ":", enabled ? " ATAPI" : " off (ATAPI)");
log("\t\t#", index, ":", enabled ? " ATAPI" : " off (ATAPI)");
break;
default:
log("\t\t#", i, ": off (unknown device signature)");
log("\t\t#", index, ": off (unknown device signature)");
}
}
};