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[arch][x86] no need to "memory" clobber simple in instructions

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They only read data into the eax register instead of memory.
This commit is contained in:
Travis Geiselbrecht
2022-10-19 19:27:57 -07:00
parent 96231b132f
commit 2ac68a56a8
1 changed files with 3 additions and 3 deletions
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6
arch/x86/include/arch/x86.h
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@@ -293,19 +293,19 @@ static inline void x86_set_cr4(ulong in_val) {
static inline uint8_t inp(uint16_t _port) {
uint8_t rv;
__asm__ __volatile__("inb %1, %0" : "=a"(rv) : "dN"(_port) : "memory");
__asm__ __volatile__("inb %1, %0" : "=a"(rv) : "dN"(_port));
return (rv);
}
static inline uint16_t inpw(uint16_t _port) {
uint16_t rv;
__asm__ __volatile__("inw %1, %0" : "=a"(rv) : "dN"(_port) : "memory");
__asm__ __volatile__("inw %1, %0" : "=a"(rv) : "dN"(_port));
return (rv);
}
static inline uint32_t inpd(uint16_t _port) {
uint32_t rv;
__asm__ __volatile__("inl %1, %0" : "=a"(rv) : "dN"(_port) : "memory");
__asm__ __volatile__("inl %1, %0" : "=a"(rv) : "dN"(_port));
return (rv);
}