Jan Engelhardt wrote:
> On Jul 9 2007 19:51, H. Peter Anvin wrote:
>
>> + status = inb(0x64);
>> + if (status & 1) {
>> + /* Read and discard input data */
>> + io_delay();
>> + (void)inb(0x60);
>
> Is the (void) cast needed for some obscure reason? Let's hope inb _is_ declared
> as volatile. (Minus the volatile flames.
>
The (void) cast is there as a stylistic device, it tells the human
reader "yes, I really meant to read this value and throw it away."
-hpa
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- References:
- x86 setup code rewrite in C
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 01/33] x86 setup: MAINTAINERS: formally take responsibility for the i386 boot code
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 02/33] hd.c: remove BIOS/CMOS queries
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 03/33] include/asm-i386/boot.h: This is <asm/boot.h>, not <linux/boot.h>
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 04/33] Unify the CPU features vectors between i386 and x86-64
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 05/33] Change CONFIG_X86_MINIMUM_CPU_MODEL to CONFIG_X86_MINIMUM_CPU_FAMILY
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 06/33] Clean up struct screen_info (<linux/screen_info.h>)
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 07/33] Use a new CPU feature word to cover all Intel features that are spread around
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 08/33] Define zero-page offset 0x1e4 as a scratch field, and use it
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 09/33] Make definitions for struct e820entry and struct e820map consistent
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 10/33] Make struct boot_params a real structure, and remove obsolete fields
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 11/33] x86-64: add CONFIG_PHYSICAL_ALIGN for consistency with i386
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 12/33] x86-64: add symbolic constants for the boot segment selectors
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 13/33] Header file to produce 16-bit code with gcc
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 14/33] Top header file for new x86 setup code
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 15/33] Simple bitops for the new x86 setup code.
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 16/33] String-handling functions for the new x86 setup code.
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 17/33] A20 handling code
- From: "H. Peter Anvin" <[email protected]>
- Re: [x86 setup 17/33] A20 handling code
- From: Jan Engelhardt <[email protected]>
- x86 setup code rewrite in C
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