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add ioport address by offset

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This commit is contained in:
Christoph Urlacher
2022-07-16 01:02:16 +02:00
parent 694e835142
commit 10c047e7b7
1 changed files with 17 additions and 0 deletions
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17
c_os/kernel/IOport.h
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@ -33,6 +33,13 @@ public:
: "a"(val), "Nd"(address)); : "a"(val), "Nd"(address));
} }
// NOTE: I added this for easier init of COM1 port
void outb(unsigned char offset, unsigned char val) const {
asm volatile("outb %0, %1"
:
: "a"(val), "Nd"(address + offset));
}
// Wortweise Ausgabe eines Wertes ueber einen I/O-Port. // Wortweise Ausgabe eines Wertes ueber einen I/O-Port.
void outw(unsigned short val) const { void outw(unsigned short val) const {
asm volatile("outw %0, %1" asm volatile("outw %0, %1"
@ -57,6 +64,16 @@ public:
return ret; return ret;
} }
// NOTE: I added this for COM1 port
unsigned char inb(unsigned char offset) const {
unsigned char ret;
asm volatile("inb %1, %0"
: "=a"(ret)
: "Nd"(address + offset));
return ret;
}
// Wortweises Einlesen eines Wertes ueber einen I/O-Port. // Wortweises Einlesen eines Wertes ueber einen I/O-Port.
unsigned short inw() const { unsigned short inw() const {
unsigned short ret; unsigned short ret;