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Implement fork()!
This is quite cool! The syscall entry point plumbs the register dump down to sys$fork(), which uses it to set up the child process's TSS in order to resume execution right after the int 0x80 fork() call. :^) This works pretty well, although there is some problem with the kernel alias mappings used to clone the parent process's regions. If I disable the MM::release_page_directory() code, there's no problem. Probably there's a premature freeing of a physical page somehow.
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16 changed files with 228 additions and 78 deletions
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@ -40,6 +40,8 @@ private:
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struct Region : public Retainable<Region> {
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Region(LinearAddress, size_t, RetainPtr<Zone>&&, String&&);
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~Region();
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RetainPtr<Region> clone();
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LinearAddress linearAddress;
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size_t size { 0 };
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RetainPtr<Zone> zone;
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