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block: let generic driver API work asynchronously

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Fix #990
This commit is contained in:
Stefan Kalkowski
2013-12-03 15:41:14 +01:00
committed by Norman Feske
parent 9c698ab6c1
commit c3c643bcf1
16 changed files with 289 additions and 311 deletions
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38
os/src/server/rom_blk/main.cc
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@ -57,9 +57,10 @@ class Rom_blk : public Block::Driver
return o;
}
void read(Genode::size_t block_number,
Genode::size_t block_count,
char *out_buffer)
void read(Genode::size_t block_number,
Genode::size_t block_count,
char* buffer,
Block::Packet_descriptor &packet)
{
/* sanity check block number */
if ((block_number + block_count > _file_sz / _blk_sz)
@ -73,32 +74,10 @@ class Rom_blk : public Block::Driver
size_t size = block_count * _blk_sz;
/* copy file content to packet payload */
memcpy(out_buffer, (void*)(_file_addr + offset), size);
memcpy((void*)buffer, (void*)(_file_addr + offset), size);
session->complete_packet(packet);
}
void write(Genode::size_t block_number,
Genode::size_t block_count,
char const *buffer)
{
PWRN("write attempt on read-only device");
}
/*
* This driver does not support DMA operation, currently.
*/
void read_dma(Genode::size_t, Genode::size_t, Genode::addr_t) {
throw Io_error(); }
void write_dma(Genode::size_t, Genode::size_t, Genode::addr_t) {
throw Io_error(); }
bool dma_enabled() { return false; }
Genode::Ram_dataspace_capability alloc_dma_buffer(Genode::size_t size) {
return Genode::env()->ram_session()->alloc(size, false); }
void sync() {}
};
@ -118,8 +97,7 @@ struct Factory : Block::Driver_factory
PINF("Using file=%s as device with block size %zx.", file, blk_sz);
try {
Rom_blk *driver = new (Genode::env()->heap()) Rom_blk(file, blk_sz);
return driver;
return new (Genode::env()->heap()) Rom_blk(file, blk_sz);
} catch(Rom_connection::Rom_connection_failed) {
PERR("Cannot open file %s.", file);
}