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| author |   Maciej W. Rozycki <macro@orcam.me.uk> | 2021-07-20 05:28:09 +0200 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2021-08-10 23:31:43 +0200 |
| commit | d25316616842b593de6f89ce2101f1af62f4d559 (patch) | |
| tree | 55ab729ffb9bed88aa3eb5abc5c2267ce492c936 /arch/x86/kernel/mpparse.c | |
| parent | x86/PCI: Add support for the Intel 82426EX PIRQ router (diff) | |
| download | linux-dev-d25316616842b593de6f89ce2101f1af62f4d559.tar.xz linux-dev-d25316616842b593de6f89ce2101f1af62f4d559.zip | |
x86: Avoid magic number with ELCR register accesses
Define PIC_ELCR1 and PIC_ELCR2 macros for accesses to the ELCR registers
implemented by many chipsets in their embedded 8259A PIC cores, avoiding
magic numbers that are difficult to handle, and complementing the macros
we already have for registers originally defined with discrete 8259A PIC
implementations. No functional change.
Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2107200237300.9461@angie.orcam.me.uk
Diffstat (limited to 'arch/x86/kernel/mpparse.c')
| -rw-r--r-- | arch/x86/kernel/mpparse.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c index 8f06449aab27..fed721f90116 100644 --- a/arch/x86/kernel/mpparse.c +++ b/arch/x86/kernel/mpparse.c @@ -19,6 +19,7 @@ #include <linux/smp.h> #include <linux/pci.h> +#include <asm/i8259.h> #include <asm/io_apic.h> #include <asm/acpi.h> #include <asm/irqdomain.h> @@ -251,7 +252,7 @@ static int __init ELCR_trigger(unsigned int irq) { unsigned int port; - port = 0x4d0 + (irq >> 3); + port = PIC_ELCR1 + (irq >> 3); return (inb(port) >> (irq & 7)) & 1; } |