On 2/22/2021 5:15 PM, 谢华伟(此时此刻） wrote:
From: "huawei.xhw" <[email protected]>
With IO BAR, we get PIO(programmed IO) address.
With MMIO BAR, we get mapped virtual address.
We distinguish PIO(Programmed IO) and MMIO(memory mapped IO) by their address
like how kernel does.
ioread/write8/16/32 is provided to access PIO/MMIO.
By the way, for virtio on arch other than x86, BAR flag indicates PIO but is
mapped.
Signed-off-by: huawei xie <[email protected]>
Reviewed-by: Maxime Coquelin <[email protected]>
<...>
+
+static inline void iowrite8(uint8_t val, void *addr)
+{
+ (uint64_t)(uintptr_t)addr >= PIO_MAX ?
+ *(volatile uint8_t *)addr = val :
+ outb(val, (unsigned long)addr);
//copying question from previous version:
Is the 'outb_p' to 'outb' conversion intentional? And if so why?
Same of the all 'outb_p', 'outw_p', 'outl_p'.
