mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 22:53:55 +08:00
96a388de5d
Move the headers to include/asm-x86 and fixup the header install make rules Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
31 lines
681 B
C
31 lines
681 B
C
/*
|
|
* NSC/Cyrix CPU indexed register access. Must be inlined instead of
|
|
* macros to ensure correct access ordering
|
|
* Access order is always 0x22 (=offset), 0x23 (=value)
|
|
*
|
|
* When using the old macros a line like
|
|
* setCx86(CX86_CCR2, getCx86(CX86_CCR2) | 0x88);
|
|
* gets expanded to:
|
|
* do {
|
|
* outb((CX86_CCR2), 0x22);
|
|
* outb((({
|
|
* outb((CX86_CCR2), 0x22);
|
|
* inb(0x23);
|
|
* }) | 0x88), 0x23);
|
|
* } while (0);
|
|
*
|
|
* which in fact violates the access order (= 0x22, 0x22, 0x23, 0x23).
|
|
*/
|
|
|
|
static inline u8 getCx86(u8 reg)
|
|
{
|
|
outb(reg, 0x22);
|
|
return inb(0x23);
|
|
}
|
|
|
|
static inline void setCx86(u8 reg, u8 data)
|
|
{
|
|
outb(reg, 0x22);
|
|
outb(data, 0x23);
|
|
}
|