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More unfinished work on kernel API

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This commit is contained in:
Nathan Giddings
2020-12-18 14:12:00 -06:00
parent 512f81f515
commit f4395ab6b5
30 changed files with 1024 additions and 568 deletions
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45
src/syscalls.cpp
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@@ -1,17 +1,28 @@
#include "syscalls.hpp"
#include "kernel.hpp"
#include "memorytype.hpp"
int mmap(void* location, size_t length, int flags)
{
// TODO: check that the requested region does not overlap something important
if(kernel.getActiveProcess().map(location, length))
{
if(kernel.allocateRegion(location, length, flags))
return 0;
else if(kernel.getActiveProcess().unmap(location, length))
return 1;
kernel.terminateActiveProcess();
}
return kernel.allocateRegion(location, length, flags);
}
int munmap(void* location, size_t length)
{
// TODO: check that the requested region does not overlap something important
kernel.freeRegion(location, length);
return 0;
if(kernel.getActiveProcess().unmap(location, length))
{
kernel.freeRegion(location, length);
return 0;
}
return 1;
}
unsigned int createSharedBlock(void* location, size_t length, int flags)
@@ -19,7 +30,7 @@ unsigned int createSharedBlock(void* location, size_t length, int flags)
unsigned int blockID = kernel.createSharedBlock(length, flags);
if(blockID > 0)
{
const MemoryBlock& block = kernel.getSharedBlock(blockID);
const SharedBlock& block = kernel.getSharedBlock(blockID);
kernel.mapRegion(location, block.getLocation(), length, flags);
// TODO: add block to current process
// TODO: perform safety checks
@@ -29,8 +40,8 @@ unsigned int createSharedBlock(void* location, size_t length, int flags)
int aquireSharedBlock(void* location, unsigned int id)
{
const MemoryBlock& block = kernel.getSharedBlock(id);
kernel.mapRegion(location, block.getLocation(), block.getSize(), block.getAttributes());
const SharedBlock& block = kernel.getSharedBlock(id);
kernel.mapRegion(location, block.getLocation(), block.getSize(), block.getFlags());
// TODO: (somehow) handle invalid ids -- possibly hard while using references
// TODO: add block to current process
// TODO: perform safety checks
@@ -59,4 +70,24 @@ int aquirePhysicalBlock(void* location, physaddr_t physicalAddress, size_t lengt
int releasePhysicalBlock(int id)
{
return 0;
}
int sendMessage(unsigned int recipient, const Message* message)
{
Message* copy = new Message(*message);
copy->m_sender = kernel.getActiveProcess().getID();
kernel.getProcess(recipient).pushMessage(copy);
return 0;
}
int receiveMessage(Message* buffer)
{
if(buffer == nullptr)
return 1;
Message* message = kernel.getActiveProcess().popMessage();
if(message == nullptr)
return 1;
*buffer = *message;
delete message;
return 0;
}