Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

David P. Reed wrote:

I do remind all that 0x80 is a BIOS-specific standard, and is per BIOS - other ports have been used in the history of the IBM PC family by some vendors, and some machines have used it for DMA port mapping!!

Correction: ALL machines use it for DMA port mapping. The port is assigned to the legacy DMA controller, but performs no operation. That's what makes it safe to write (NOT read!)

	-hpa
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• References:
  • RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: "David P. Reed" <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Andi Kleen <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Alan Cox <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Pavel Machek <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Andi Kleen <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Pavel Machek <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Rene Herman <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Krzysztof Halasa <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: David Newall <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: "H. Peter Anvin" <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: David Newall <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Paul Rolland <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Rene Herman <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: David Newall <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Rene Herman <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Paul Rolland <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Rene Herman <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Rene Herman <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Paul Rolland <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: Rene Herman <[email protected]>
  • Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    • From: "David P. Reed" <[email protected]>

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