diff options
Diffstat (limited to 'arch/mips/sgi-ip27')
| -rw-r--r-- | arch/mips/sgi-ip27/Makefile | 6 | ||||
| -rw-r--r-- | arch/mips/sgi-ip27/ip27-irqno.c | 48 |
2 files changed, 51 insertions, 3 deletions
diff --git a/arch/mips/sgi-ip27/Makefile b/arch/mips/sgi-ip27/Makefile index da8f6816d346..ab4affa626c7 100644 --- a/arch/mips/sgi-ip27/Makefile +++ b/arch/mips/sgi-ip27/Makefile @@ -2,9 +2,9 @@ # Makefile for the IP27 specific kernel interface routines under Linux. # -obj-y := ip27-berr.o ip27-irq.o ip27-init.o ip27-klconfig.o ip27-klnuma.o \ - ip27-memory.o ip27-nmi.o ip27-reset.o ip27-timer.o ip27-hubio.o \ - ip27-xtalk.o +obj-y := ip27-berr.o ip27-irq.o ip27-irqno.o ip27-init.o ip27-klconfig.o \ + ip27-klnuma.o ip27-memory.o ip27-nmi.o ip27-reset.o ip27-timer.o \ + ip27-hubio.o ip27-xtalk.o obj-$(CONFIG_EARLY_PRINTK) += ip27-console.o obj-$(CONFIG_PCI) += ip27-irq-pci.o diff --git a/arch/mips/sgi-ip27/ip27-irqno.c b/arch/mips/sgi-ip27/ip27-irqno.c new file mode 100644 index 000000000000..957ab58e1c00 --- /dev/null +++ b/arch/mips/sgi-ip27/ip27-irqno.c @@ -0,0 +1,48 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/types.h> + +#include <asm/barrier.h> + +static DECLARE_BITMAP(irq_map, NR_IRQS); + +int allocate_irqno(void) +{ + int irq; + +again: + irq = find_first_zero_bit(irq_map, NR_IRQS); + + if (irq >= NR_IRQS) + return -ENOSPC; + + if (test_and_set_bit(irq, irq_map)) + goto again; + + return irq; +} + +/* + * Allocate the 16 legacy interrupts for i8259 devices. This happens early + * in the kernel initialization so treating allocation failure as BUG() is + * ok. + */ +void __init alloc_legacy_irqno(void) +{ + int i; + + for (i = 0; i <= 16; i++) + BUG_ON(test_and_set_bit(i, irq_map)); +} + +void free_irqno(unsigned int irq) +{ + smp_mb__before_atomic(); + clear_bit(irq, irq_map); + smp_mb__after_atomic(); +} |