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Kernel: Add read_gs_value() and write_gs_value()

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Co-authored-by: Tom <tomut@yahoo.com>
This commit is contained in:
Andreas Kling 2021-08-29 12:26:40 +02:00
parent 6ae60137d7
commit 249d6a490d
Notes: sideshowbarker 2024-07-18 05:06:26 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/249d6a490d0
1 changed files with 19 additions and 0 deletions
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19
Kernel/Arch/x86/ASM_wrapper.h
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@ -62,6 +62,25 @@ ALWAYS_INLINE u16 get_gs()
}
#endif
template<typename T>
ALWAYS_INLINE T read_gs_value(FlatPtr offset)
{
T val;
asm volatile(
"mov %%gs:%a[off], %[val]"
: [val] "=r"(val)
: [off] "ir"(offset));
return val;
}
template<typename T>
ALWAYS_INLINE void write_gs_value(FlatPtr offset, T val)
{
asm volatile(
"mov %[val], %%gs:%a[off]" ::[off] "ir"(offset), [val] "r"(val)
: "memory");
}
ALWAYS_INLINE FlatPtr read_gs_ptr(FlatPtr offset)
{
FlatPtr val;