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Kernel: Add safe atomic functions

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This allows us to perform atomic operations on potentially unsafe
user space pointers.
This commit is contained in:
Tom 2020-12-19 18:48:56 -07:00 • committed by Andreas Kling
parent 992f513ad2
commit b17a889320
10 changed files with 573 additions and 166 deletions
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4
Kernel/Arch/i386/CPU.h
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@ -284,10 +284,6 @@ void flush_idt();
void load_task_register(u16 selector);
void handle_crash(RegisterState&, const char* description, int signal, bool out_of_memory = false);
[[nodiscard]] bool safe_memcpy(void* dest_ptr, const void* src_ptr, size_t n, void*& fault_at);
[[nodiscard]] ssize_t safe_strnlen(const char* str, size_t max_n, void*& fault_at);
[[nodiscard]] bool safe_memset(void* dest_ptr, int c, size_t n, void*& fault_at);
#define LSW(x) ((u32)(x)&0xFFFF)
#define MSW(x) (((u32)(x) >> 16) & 0xFFFF)
#define LSB(x) ((x)&0xFF)