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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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14
src/kernel/objects/vm_area.h
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@@ -71,8 +71,10 @@ public:
/// Get the physical page for the given offset
/// \arg offset The offset into the VMA
/// \arg phys [out] Receives the physical page address, if any
/// \arg alloc If true, and this is a valid address with no frame,
/// allocate one if applicable
/// \returns True if there should be a page at the given offset
virtual bool get_page(uintptr_t offset, uintptr_t &phys) = 0;
virtual bool get_page(uintptr_t offset, uintptr_t &phys, bool alloc = true) = 0;
protected:
/// A VMA is not deleted until both no handles remain AND it's not
@@ -106,7 +108,7 @@ public:
virtual ~vm_area_fixed();
virtual size_t resize(size_t size) override;
virtual bool get_page(uintptr_t offset, uintptr_t &phys) override;
virtual bool get_page(uintptr_t offset, uintptr_t &phys, bool alloc = true) override;
private:
uintptr_t m_start;
@@ -124,7 +126,7 @@ public:
vm_area_open(size_t size, vm_flags flags);
virtual ~vm_area_open();
virtual bool get_page(uintptr_t offset, uintptr_t &phys) override;
virtual bool get_page(uintptr_t offset, uintptr_t &phys, bool alloc = true) override;
/// Tell this VMA about an existing mapping that did not originate
/// from get_page.
@@ -147,7 +149,7 @@ public:
virtual ~vm_area_untracked();
virtual bool add_to(vm_space *space) override;
virtual bool get_page(uintptr_t offset, uintptr_t &phys) override;
virtual bool get_page(uintptr_t offset, uintptr_t &phys, bool alloc = true) override;
};
@@ -175,7 +177,7 @@ public:
/// Return a section address to the available pool
void return_section(uintptr_t addr);
virtual bool get_page(uintptr_t offset, uintptr_t &phys) override;
virtual bool get_page(uintptr_t offset, uintptr_t &phys, bool alloc = true) override;
private:
size_t m_pages;
@@ -196,7 +198,7 @@ public:
vm_area_ring(size_t size, vm_flags flags);
virtual ~vm_area_ring();
virtual bool get_page(uintptr_t offset, uintptr_t &phys) override;
virtual bool get_page(uintptr_t offset, uintptr_t &phys, bool alloc = true) override;
private:
size_t m_bufsize;