Messages in this thread | | | Subject | Re: [PATCH 1/6] x86: Add VMWare Host Communication Macros | From | "H. Peter Anvin" <> | Date | Tue, 1 Dec 2015 14:49:11 -0800 |
| |
On 12/01/15 14:18, Sinclair Yeh wrote: > These macros will be used by multiple VMWare modules for handling > host communication.
> + __asm__ __volatile__ ("inl %%dx" : \
This is odd at best; the standard assembly form of this instruction is:
inl (%dx),%eax
Also, we don't need the underscored forms of asm and volatile for kernel code.
> + __asm__ __volatile__ ("movq %13, %%rbp;" \ > + "cld; rep outsb; " \ > + "movq %%rbp, %6" : \
cld shouldn't be necessary here, DF=0 is part of the normal ABI environment.
You also don't save/restore %rbp here, but you do below? Seems very odd.
It might be better do so something like:
+#define VMW_PORT_HB_OUT(in1, in2, port_num, magic, \ + eax, ebx, ecx, edx, si, di, bp) \ +({ \ + __asm__ __volatile__ ("xchgq %6, %%rbp;" \ + "cld; rep outsb; " \ + "xchgq %%rbp, %6" : \ + "=a"(eax), \ + "=b"(ebx), \ + "=c"(ecx), \ + "=d"(edx), \ + "+S"(si), \ + "+D"(di), \ + "+r"(bp) : \ + "a"(magic), \ + "b"(in1), \ + "c"(in2), \ + "d"(port_num) : \ + "memory", "cc"); \ +})
| |