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[kernel] Add (wip) futex syscalls

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Add the syscalls j6_futex_wait and j6_futex_wake. Currently marking this
as WIP as they need more testing.

Added to support futexes:
- vm_area and vm_space support for looking up physical address for a
  virtual address
- libj6 mutex implementation using futex system calls
This commit is contained in:
Justin C. Miller
2023-02-26 11:32:30 -08:00
parent 0c777bc62f
commit ed95574c24
10 changed files with 222 additions and 14 deletions
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24
src/kernel/objects/vm_area.cpp
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@@ -86,7 +86,7 @@ vm_area_fixed::resize(size_t size)
}
bool
vm_area_fixed::get_page(uintptr_t offset, uintptr_t &phys)
vm_area_fixed::get_page(uintptr_t offset, uintptr_t &phys, bool alloc)
{
if (offset > m_size)
return false;
@@ -106,11 +106,16 @@ vm_area_untracked::~vm_area_untracked()
}
bool
vm_area_untracked::get_page(uintptr_t offset, uintptr_t &phys)
vm_area_untracked::get_page(uintptr_t offset, uintptr_t &phys, bool alloc)
{
if (offset > m_size)
return false;
if (!alloc) {
phys = 0;
return true;
}
return frame_allocator::get().allocate(1, &phys);
}
@@ -136,9 +141,12 @@ vm_area_open::~vm_area_open()
}
bool
vm_area_open::get_page(uintptr_t offset, uintptr_t &phys)
vm_area_open::get_page(uintptr_t offset, uintptr_t &phys, bool alloc)
{
return page_tree::find_or_add(m_mapped, offset, phys);
if (alloc)
return page_tree::find_or_add(m_mapped, offset, phys);
else
return page_tree::find(m_mapped, offset, phys);
}
void
@@ -171,7 +179,7 @@ vm_area_guarded::return_section(uintptr_t addr)
}
bool
vm_area_guarded::get_page(uintptr_t offset, uintptr_t &phys)
vm_area_guarded::get_page(uintptr_t offset, uintptr_t &phys, bool alloc)
{
if (offset >= m_stacks.end())
return false;
@@ -181,7 +189,7 @@ vm_area_guarded::get_page(uintptr_t offset, uintptr_t &phys)
if ((offset >> 12) % m_pages == 0)
return false;
return vm_area_open::get_page(offset, phys);
return vm_area_open::get_page(offset, phys, alloc);
}
vm_area_ring::vm_area_ring(size_t size, vm_flags flags) :
@@ -193,11 +201,11 @@ vm_area_ring::vm_area_ring(size_t size, vm_flags flags) :
vm_area_ring::~vm_area_ring() {}
bool
vm_area_ring::get_page(uintptr_t offset, uintptr_t &phys)
vm_area_ring::get_page(uintptr_t offset, uintptr_t &phys, bool alloc)
{
if (offset > m_bufsize)
offset -= m_bufsize;
return vm_area_open::get_page(offset, phys);
return vm_area_open::get_page(offset, phys, alloc);
}
} // namespace obj