68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
#ifndef ASM_H
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#define ASM_H
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#include <cstdint>
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static inline uint8_t inb(uint16_t port) {
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uint8_t value;
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asm volatile ("inb %1, %0" : "=a"(value) : "Nd"(port));
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return value;
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}
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static inline uint16_t inw(uint16_t port) {
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uint16_t value;
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asm volatile ("inw %1, %0" : "=a"(value) : "Nd"(port));
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return value;
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}
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static inline uint32_t inl(uint16_t port) {
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uint32_t value;
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asm volatile ("inl %1, %0" : "=a"(value) : "Nd"(port));
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return value;
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}
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static inline void outb(uint16_t port, uint8_t value) {
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asm volatile ("outb %0, %1" : : "a"(value), "Nd"(port));
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}
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static inline void outw(uint16_t port, uint16_t value) {
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asm volatile ("outw %0, %1" : : "a"(value), "Nd"(port));
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}
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static inline void outl(uint16_t port, uint32_t value) {
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asm volatile ("outl %0, %1" : : "a"(value), "Nd"(port));
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}
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static inline void enableInterrupts() {
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asm volatile ("sti": : :"memory");
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}
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static inline void disableInterrupts() {
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asm volatile ("cli": : :"memory");
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}
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static inline uint32_t eflags() {
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uint32_t value;
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asm volatile ( "pushf\n\t"
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"popl %0"
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: "=g"(value));
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return value;
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}
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static inline bool interruptsEnabled() {
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return (eflags() & (1u << 9u)) != 0;
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}
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static void pmInterruptCall(unsigned short selector, unsigned long offset) {
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__asm__ __volatile__ (
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"pushf\n" // Push EFLAGS
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"mov %0, %%ax\n" // Load the segment selector into AX
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"mov %%ax, %%ds\n" // Move it to DS (or another segment register)
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"call *%1\n" // Perform the indirect far call using the offset
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: // No output operands
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: "r" (selector), "r" (offset) // Input operands
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: "%ax" // Clobbered register
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);
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}
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#endif |