mirror of
git://projects.qi-hardware.com/iris.git
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99 lines
3.3 KiB
Plaintext
99 lines
3.3 KiB
Plaintext
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#pypp 0
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// Iris: micro-kernel for a capability-based operating system.
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// source/buffer.ccp: block device buffer.
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// Copyright 2010 Bas Wijnen <wijnen@debian.org>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "iris.hh"
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#include "devices.hh"
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static unsigned align
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static Iris::Page page, rpage
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static unsigned mapping, rmapping
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static Iris::Num size, current
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static Iris::String dev
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static void read_block (Iris::Num idx):
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idx = idx.value () & PAGE_MASK
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if idx.value () == current.value ():
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return
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//kdebug ("buffering block ")
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//kdebug_num (idx.h)
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//kdebug (":")
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//kdebug_num (idx.l)
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//kdebug ("\n")
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dev.get_block (idx, PAGE_SIZE, 0, page)
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//kdebug ("buffered\n")
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current = idx
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Iris::Num start ():
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dev = Iris::my_parent.get_capability <Iris::WString> ()
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align = dev.get_align_bits ()
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size = dev.get_size ()
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if align > PAGE_BITS:
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Iris::panic (align, "invalid alignment value for block device")
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page = Iris::my_memory.create_page ()
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rpage = Iris::my_memory.create_page ()
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page.set_flags (Iris::Page::PAYING)
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rpage.set_flags (Iris::Page::PAYING)
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mapping = 0x15000
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rmapping = 0x17000
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Iris::my_memory.map (page, mapping)
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Iris::my_memory.map (rpage, rmapping)
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current.h = ~0
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current.l = ~0
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Iris::Cap cap = Iris::my_receiver.create_capability (0)
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Iris::my_parent.provide_capability <Iris::WString> (cap.copy ())
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Iris::free_cap (cap)
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Iris::my_parent.init_done ()
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while true:
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Iris::wait ()
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switch Iris::recv.data[0].l:
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case Iris::String::GET_SIZE:
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Iris::recv.reply.invoke (size)
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break
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case Iris::String::GET_ALIGN_BITS:
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// Use 16 byte alignment to make implementing GET_CHARS easier.
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Iris::recv.reply.invoke (4)
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break
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case Iris::String::GET_CHARS:
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Iris::Cap reply = Iris::get_reply ()
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unsigned offset = Iris::recv.data[1].l & ~PAGE_MASK & ~((1 << 4) - 1)
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read_block (Iris::recv.data[1])
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unsigned *data = (unsigned *)((char *)mapping)[offset]
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reply.invoke (Iris::Num (data[0], data[1]), Iris::Num (data[2], data[3]))
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Iris::free_cap (reply)
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break
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case Iris::String::GET_BLOCK:
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Iris::Cap reply = Iris::get_reply ()
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Iris::Page arg = Iris::get_arg ()
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unsigned offset = Iris::recv.data[1].l & ~PAGE_MASK & ~((1 << 4) - 1)
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unsigned sz = Iris::recv.data[0].h >> 16
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unsigned roffset = Iris::recv.data[0].h & 0xffff
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Iris::Num idx = Iris::recv.data[1]
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arg.set_flags (Iris::Page::FRAME | Iris::Page::PAYING)
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arg.share (rpage)
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rpage.set_flags (Iris::Page::FRAME)
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read_block (idx)
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for unsigned i = 0; i < sz; ++i:
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((char *)rmapping)[roffset + i] = ((char *)mapping)[offset + i]
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rpage.set_flags (0, Iris::Page::FRAME)
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reply.invoke ()
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Iris::free_cap (reply)
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Iris::free_cap (arg)
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break
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default:
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Iris::panic (Iris::recv.data[0].l, "invalid request for buffer")
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