avr/qmk/firmware - [no description]

	Commit message (Collapse)	Author	Age	Files	Lines
*	clang-format changes	skullY	2019-08-30	1	-20/+20
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*	Make it easier to use drivers	Fred Sundvik	2017-07-10	1	-2/+2
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*	Clarify naming between LCD_BACKLIGHT and LED_BACKLIGHT	Fred Sundvik	2017-07-10	1	-0/+143

/* * linux/arch/i386/kernel/irq.c * * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar * * This file contains the lowest level x86-specific interrupt * entry, irq-stacks and irq statistics code. All the remaining * irq logic is done by the generic kernel/irq/ code and * by the x86-specific irq controller code. (e.g. i8259.c and * io_apic.c.) */ #include <asm/uaccess.h> #include <linux/module.h> #include <linux/seq_file.h> #include <linux/interrupt.h> #include <linux/kernel_stat.h> #ifndef CONFIG_X86_LOCAL_APIC /* * 'what should we do if we get a hw irq event on an illegal vector'. * each architecture has to answer this themselves. */ void ack_bad_irq(unsigned int irq) { printk("unexpected IRQ trap at vector %02x\n", irq); } #endif #ifdef CONFIG_4KSTACKS /* * per-CPU IRQ handling contexts (thread information and stack) */ union irq_ctx { struct thread_info tinfo; u32 stack[THREAD_SIZE/sizeof(u32)]; }; static union irq_ctx *hardirq_ctx[NR_CPUS]; static union irq_ctx *softirq_ctx[NR_CPUS]; #endif /* * do_IRQ handles all normal device IRQ's (the special * SMP cross-CPU interrupts have their own specific * handlers). */ fastcall unsigned int do_IRQ(struct pt_regs *regs) { /* high bits used in ret_from_ code */ int irq = regs->orig_eax & __IRQ_MASK(HARDIRQ_BITS); #ifdef CONFIG_4KSTACKS union irq_ctx *curctx, *irqctx; u32 *isp; #endif irq_enter(); #ifdef CONFIG_DEBUG_STACKOVERFLOW /* Debugging check for stack overflow: is there less than 1KB free? */ { long esp; __asm__ __volatile__("andl %%esp,%0" : "=r" (esp) : "0" (THREAD_SIZE - 1)); if (unlikely(esp < (sizeof(struct thread_info) + STACK_WARN))) { printk("do_IRQ: stack overflow: %ld\n", esp - sizeof(struct thread_info)); dump_stack(); } } #endif #ifdef CONFIG_4KSTACKS curctx = (union irq_ctx *) current_thread_info(); irqctx = hardirq_ctx[smp_processor_id()]; /* * this is where we switch to the IRQ stack. However, if we are * already using the IRQ stack (because we interrupted a hardirq * handler) we can't do that and just have to keep using the * current stack (which is the irq stack already after all) */ if (curctx != irqctx) { int arg1, arg2, ebx; /* build the stack frame on the IRQ stack */ isp = (u32*) ((char*)irqctx + sizeof(*irqctx)); irqctx->tinfo.task = curctx->tinfo.task; irqctx->tinfo.previous_esp = current_stack_pointer; asm volatile( " xchgl %%ebx,%%esp \n" " call __do_IRQ \n" " movl %%ebx,%%esp \n" : "=a" (arg1), "=d" (arg2), "=b" (ebx) : "0" (irq), "1" (regs), "2" (isp) : "memory", "cc", "ecx" ); } else #endif __do_IRQ(irq, regs); irq_exit(); return 1; } #ifdef CONFIG_4KSTACKS /* * These should really be __section__(".bss.page_aligned") as well, but * gcc's 3.0 and earlier don't handle that correctly. */ static char softirq_stack[NR_CPUS * THREAD_SIZE] __attribute__((__aligned__(THREAD_SIZE))); static char hardirq_stack[NR_CPUS * THREAD_SIZE] __attribute__((__aligned__(THREAD_SIZE))); /* * allocate per-cpu stacks for hardirq and for softirq processing */ void irq_ctx_init(int cpu) { union irq_ctx *irqctx; if (hardirq_ctx[cpu]) return; irqctx = (union irq_ctx*) &hardirq_stack[cpu*THREAD_SIZE]; irqctx->tinfo.task = NULL; irqctx->tinfo.exec_domain = NULL; irqctx->tinfo.cpu = cpu; irqctx->tinfo.preempt_count = HARDIRQ_OFFSET; irqctx->tinfo.addr_limit = MAKE_MM_SEG(0); hardirq_ctx[cpu] = irqctx; irqctx = (union irq_ctx*) &softirq_stack[cpu*THREAD_SIZE]; irqctx->tinfo.task = NULL; irqctx->tinfo.exec_domain = NULL; irqctx->tinfo.cpu = cpu; irqctx->tinfo.preempt_count = SOFTIRQ_OFFSET; irqctx->tinfo.addr_limit = MAKE_MM_SEG(0); softirq_ctx[cpu] = irqctx; printk("CPU %u irqstacks, hard=%p soft=%p\n", cpu,hardirq_ctx[cpu],softirq_ctx[cpu]); } extern asmlinkage void __do_softirq(void); asmlinkage void do_softirq(void) { unsigned long flags; struct thread_info *curctx; union irq_ctx *irqctx; u32 *isp; if (in_interrupt()) return; local_irq_save(flags); if (local_softirq_pending()) { curctx = current_thread_info(); irqctx = softirq_ctx[smp_processor_id()]; irqctx->tinfo.task = curctx->task; irqctx->tinfo.previous_esp = current_stack_pointer; /* build the stack frame on the softirq stack */ isp = (u32*) ((char*)irqctx + sizeof(*irqctx)); asm volatile( " xchgl %%ebx,%%esp \n" " call __do_softirq \n" " movl %%ebx,%%esp \n" : "=b"(isp) : "0"(isp) : "memory", "cc", "edx", "ecx", "eax" ); } local_irq_restore(flags); } EXPORT_SYMBOL(do_softirq); #endif /* * Interrupt statistics: */ atomic_t irq_err_count; /* * /proc/interrupts printing: */ int show_interrupts(struct seq_file *p, void *v) { int i = *(loff_t *) v, j; struct irqaction * action; unsigned long flags; if (i == 0) { seq_printf(p, " "); for (j=0; j<NR_CPUS; j++) if (cpu_online(j)) seq_printf(p, "CPU%d ",j); seq_putc(p, '\n'); } if (i < NR_IRQS) { spin_lock_irqsave(&irq_desc[i].lock, flags); action = irq_desc[i].action; if (!action) goto skip; seq_printf(p, "%3d: ",i); #ifndef CONFIG_SMP seq_printf(p, "%10u ", kstat_irqs(i)); #else for (j = 0; j < NR_CPUS; j++) if (cpu_online(j)) seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); #endif seq_printf(p, " %14s", irq_desc[i].handler->typename); seq_printf(p, " %s", action->name); for (action=action->next; action; action = action->next) seq_printf(p, ", %s", action->name); seq_putc(p, '\n'); skip: spin_unlock_irqrestore(&irq_desc[i].lock, flags); } else if (i == NR_IRQS) { seq_printf(p, "NMI: "); for (j = 0; j < NR_CPUS; j++) if (cpu_online(j)) seq_printf(p, "%10u ", nmi_count(j)); seq_putc(p, '\n'); #ifdef CONFIG_X86_LOCAL_APIC seq_printf(p, "LOC: "); for (j = 0; j < NR_CPUS; j++) if (cpu_online(j)) seq_printf(p, "%10u ", irq_stat[j].apic_timer_irqs); seq_putc(p, '\n'); #endif seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); #if defined(CONFIG_X86_IO_APIC) seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count)); #endif } return 0; }