diff options
Diffstat (limited to 'qemu/roms/u-boot/arch/x86/lib/interrupts.c')
| -rw-r--r-- | qemu/roms/u-boot/arch/x86/lib/interrupts.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/arch/x86/lib/interrupts.c b/qemu/roms/u-boot/arch/x86/lib/interrupts.c new file mode 100644 index 000000000..6bb22d25e --- /dev/null +++ b/qemu/roms/u-boot/arch/x86/lib/interrupts.c @@ -0,0 +1,145 @@ +/* + * (C) Copyright 2009 + * Graeme Russ, <graeme.russ@gmail.com> + * + * (C) Copyright 2007 + * Daniel Hellstrom, Gaisler Research, <daniel@gaisler.com> + * + * (C) Copyright 2006 + * Detlev Zundel, DENX Software Engineering, <dzu@denx.de> + * + * (C) Copyright -2003 + * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> + * + * (C) Copyright 2002 + * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> + * + * (C) Copyright 2001 + * Josh Huber, Mission Critical Linux, Inc, <huber@mclx.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +/* + * This file contains the high-level API for the interrupt sub-system + * of the x86 port of U-Boot. Most of the functionality has been + * shamelessly stolen from the leon2 / leon3 ports of U-Boot. + * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are + * credited for the corresponding work on those ports. The original + * interrupt handling routines for the x86 port were written by + * Daniel Engström + */ + +#include <common.h> +#include <asm/interrupt.h> + +struct irq_action { + interrupt_handler_t *handler; + void *arg; + unsigned int count; +}; + +static struct irq_action irq_handlers[CONFIG_SYS_NUM_IRQS] = { {0} }; +static int spurious_irq_cnt; +static int spurious_irq; + +void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg) +{ + int status; + + if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) { + printf("irq_install_handler: bad irq number %d\n", irq); + return; + } + + if (irq_handlers[irq].handler != NULL) + printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n", + (ulong) handler, + (ulong) irq_handlers[irq].handler); + + status = disable_interrupts(); + + irq_handlers[irq].handler = handler; + irq_handlers[irq].arg = arg; + irq_handlers[irq].count = 0; + + unmask_irq(irq); + + if (status) + enable_interrupts(); + + return; +} + +void irq_free_handler(int irq) +{ + int status; + + if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) { + printf("irq_free_handler: bad irq number %d\n", irq); + return; + } + + status = disable_interrupts(); + + mask_irq(irq); + + irq_handlers[irq].handler = NULL; + irq_handlers[irq].arg = NULL; + + if (status) + enable_interrupts(); + + return; +} + +void do_irq(int hw_irq) +{ + int irq = hw_irq - 0x20; + + if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) { + printf("do_irq: bad irq number %d\n", irq); + return; + } + + if (irq_handlers[irq].handler) { + mask_irq(irq); + + irq_handlers[irq].handler(irq_handlers[irq].arg); + irq_handlers[irq].count++; + + unmask_irq(irq); + specific_eoi(irq); + + } else { + if ((irq & 7) != 7) { + spurious_irq_cnt++; + spurious_irq = irq; + } + } +} + +#if defined(CONFIG_CMD_IRQ) +int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + int irq; + + printf("Spurious IRQ: %u, last unknown IRQ: %d\n", + spurious_irq_cnt, spurious_irq); + + printf("Interrupt-Information:\n"); + printf("Nr Routine Arg Count\n"); + + for (irq = 0; irq <= CONFIG_SYS_NUM_IRQS; irq++) { + if (irq_handlers[irq].handler != NULL) { + printf("%02d %08lx %08lx %d\n", + irq, + (ulong)irq_handlers[irq].handler, + (ulong)irq_handlers[irq].arg, + irq_handlers[irq].count); + } + } + + return 0; +} +#endif |