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context.cpp
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49 lines (44 loc) · 1.47 KB
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// This file is a part of the IncludeOS unikernel - www.includeos.org
//
// Copyright 2015 Oslo and Akershus University College of Applied Sciences
// and Alfred Bratterud
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <kernel/context.hpp>
#include <cstdint>
extern "C" void __context_switch(uintptr_t stack);
static Context::context_func destination;
extern "C"
void __context_switch_delegate()
{
destination();
}
void Context::jump(void* location, context_func func)
{
// store so we can call it later
destination = func;
// switch to stack from @location
__context_switch((uintptr_t) location);
}
void Context::create(unsigned stack_size, context_func func)
{
// store so we can call it later
destination = func;
// create and switch to new stack
char* stack_mem = new char[stack_size];
assert(stack_mem);
// aligned to 16 byte boundary
uintptr_t start = (uintptr_t) (stack_mem+stack_size) & ~0xF;
__context_switch(start);
delete[] stack_mem;
}