X-Git-Url: https://vcs.maemo.org/git/?a=blobdiff_plain;f=hw%2Fi8259.c;h=1e256d96b39a41bc17ee5b731b7f0cba6dbb786a;hb=cd346349b45ef056f138a184f660b8c34c3213cc;hp=e09bc9f3128ad0508677939a5925e47eeb9d2930;hpb=660de33686226402a064e3fbab9cc6dfed06b087;p=qemu diff --git a/hw/i8259.c b/hw/i8259.c index e09bc9f..1e256d9 100644 --- a/hw/i8259.c +++ b/hw/i8259.c @@ -1,8 +1,8 @@ /* * QEMU 8259 interrupt controller emulation - * + * * Copyright (c) 2003-2004 Fabrice Bellard - * + * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights @@ -27,6 +27,7 @@ //#define DEBUG_PIC //#define DEBUG_IRQ_LATENCY +//#define DEBUG_IRQ_COUNT typedef struct PicState { uint8_t last_irr; /* edge detection */ @@ -43,13 +44,29 @@ typedef struct PicState { uint8_t rotate_on_auto_eoi; uint8_t special_fully_nested_mode; uint8_t init4; /* true if 4 byte init */ + uint8_t single_mode; /* true if slave pic is not initialized */ uint8_t elcr; /* PIIX edge/trigger selection*/ uint8_t elcr_mask; + PicState2 *pics_state; } PicState; -/* 0 is master pic, 1 is slave pic */ -static PicState pics[2]; -static int pic_irq_requested; +struct PicState2 { + /* 0 is master pic, 1 is slave pic */ + /* XXX: better separation between the two pics */ + PicState pics[2]; + qemu_irq parent_irq; + void *irq_request_opaque; + /* IOAPIC callback support */ + SetIRQFunc *alt_irq_func; + void *alt_irq_opaque; +}; + +#if defined(DEBUG_PIC) || defined (DEBUG_IRQ_COUNT) +static int irq_level[16]; +#endif +#ifdef DEBUG_IRQ_COUNT +static uint64_t irq_count[16]; +#endif /* set irq level. If an edge is detected, then the IRR is set to 1 */ static inline void pic_set_irq1(PicState *s, int irq, int level) @@ -103,7 +120,7 @@ static int pic_get_irq(PicState *s) master, the IRQ coming from the slave is not taken into account for the priority computation. */ mask = s->isr; - if (s->special_fully_nested_mode && s == &pics[0]) + if (s->special_fully_nested_mode && s == &s->pics_state->pics[0]) mask &= ~(1 << 2); cur_priority = get_priority(s, mask); if (priority < cur_priority) { @@ -116,64 +133,74 @@ static int pic_get_irq(PicState *s) /* raise irq to CPU if necessary. must be called every time the active irq may change */ -static void pic_update_irq(void) +/* XXX: should not export it, but it is needed for an APIC kludge */ +void pic_update_irq(PicState2 *s) { int irq2, irq; /* first look at slave pic */ - irq2 = pic_get_irq(&pics[1]); + irq2 = pic_get_irq(&s->pics[1]); if (irq2 >= 0) { /* if irq request by slave pic, signal master PIC */ - pic_set_irq1(&pics[0], 2, 1); - pic_set_irq1(&pics[0], 2, 0); + pic_set_irq1(&s->pics[0], 2, 1); + pic_set_irq1(&s->pics[0], 2, 0); } /* look at requested irq */ - irq = pic_get_irq(&pics[0]); + irq = pic_get_irq(&s->pics[0]); if (irq >= 0) { - if (irq == 2) { - /* from slave pic */ - pic_irq_requested = 8 + irq2; - } else { - /* from master pic */ - pic_irq_requested = irq; - } #if defined(DEBUG_PIC) { int i; for(i = 0; i < 2; i++) { - printf("pic%d: imr=%x irr=%x padd=%d\n", - i, pics[i].imr, pics[i].irr, pics[i].priority_add); - + printf("pic%d: imr=%x irr=%x padd=%d\n", + i, s->pics[i].imr, s->pics[i].irr, + s->pics[i].priority_add); + } } - printf("pic: cpu_interrupt req=%d\n", pic_irq_requested); + printf("pic: cpu_interrupt\n"); #endif - cpu_interrupt(cpu_single_env, CPU_INTERRUPT_HARD); + qemu_irq_raise(s->parent_irq); + } + +/* all targets should do this rather than acking the IRQ in the cpu */ +#if defined(TARGET_MIPS) || defined(TARGET_PPC) + else { + qemu_irq_lower(s->parent_irq); } +#endif } #ifdef DEBUG_IRQ_LATENCY int64_t irq_time[16]; #endif -#if defined(DEBUG_PIC) -int irq_level[16]; -#endif -void pic_set_irq(int irq, int level) +void i8259_set_irq(void *opaque, int irq, int level) { -#if defined(DEBUG_PIC) + PicState2 *s = opaque; + +#if defined(DEBUG_PIC) || defined(DEBUG_IRQ_COUNT) if (level != irq_level[irq]) { - printf("pic_set_irq: irq=%d level=%d\n", irq, level); +#if defined(DEBUG_PIC) + printf("i8259_set_irq: irq=%d level=%d\n", irq, level); +#endif irq_level[irq] = level; +#ifdef DEBUG_IRQ_COUNT + if (level == 1) + irq_count[irq]++; +#endif } #endif #ifdef DEBUG_IRQ_LATENCY if (level) { - irq_time[irq] = cpu_get_ticks(); + irq_time[irq] = qemu_get_clock(vm_clock); } #endif - pic_set_irq1(&pics[irq >> 3], irq & 7, level); - pic_update_irq(); + pic_set_irq1(&s->pics[irq >> 3], irq & 7, level); + /* used for IOAPIC irqs */ + if (s->alt_irq_func) + s->alt_irq_func(s->alt_irq_opaque, irq, level); + pic_update_irq(s); } /* acknowledge interrupt 'irq' */ @@ -185,41 +212,75 @@ static inline void pic_intack(PicState *s, int irq) } else { s->isr |= (1 << irq); } - s->irr &= ~(1 << irq); + /* We don't clear a level sensitive interrupt here */ + if (!(s->elcr & (1 << irq))) + s->irr &= ~(1 << irq); } -int cpu_get_pic_interrupt(CPUState *env) +int pic_read_irq(PicState2 *s) { int irq, irq2, intno; - /* signal the pic that the irq was acked by the CPU */ - irq = pic_irq_requested; + irq = pic_get_irq(&s->pics[0]); + if (irq >= 0) { + pic_intack(&s->pics[0], irq); + if (irq == 2) { + irq2 = pic_get_irq(&s->pics[1]); + if (irq2 >= 0) { + pic_intack(&s->pics[1], irq2); + } else { + /* spurious IRQ on slave controller */ + irq2 = 7; + } + intno = s->pics[1].irq_base + irq2; + irq = irq2 + 8; + } else { + intno = s->pics[0].irq_base + irq; + } + } else { + /* spurious IRQ on host controller */ + irq = 7; + intno = s->pics[0].irq_base + irq; + } + pic_update_irq(s); + #ifdef DEBUG_IRQ_LATENCY - printf("IRQ%d latency=%0.3fus\n", - irq, - (double)(cpu_get_ticks() - irq_time[irq]) * 1000000.0 / ticks_per_sec); + printf("IRQ%d latency=%0.3fus\n", + irq, + (double)(qemu_get_clock(vm_clock) - irq_time[irq]) * 1000000.0 / ticks_per_sec); #endif #if defined(DEBUG_PIC) printf("pic_interrupt: irq=%d\n", irq); #endif - - if (irq >= 8) { - irq2 = irq & 7; - pic_intack(&pics[1], irq2); - irq = 2; - intno = pics[1].irq_base + irq2; - } else { - intno = pics[0].irq_base + irq; - } - pic_intack(&pics[0], irq); - pic_update_irq(); return intno; } +static void pic_reset(void *opaque) +{ + PicState *s = opaque; + + s->last_irr = 0; + s->irr = 0; + s->imr = 0; + s->isr = 0; + s->priority_add = 0; + s->irq_base = 0; + s->read_reg_select = 0; + s->poll = 0; + s->special_mask = 0; + s->init_state = 0; + s->auto_eoi = 0; + s->rotate_on_auto_eoi = 0; + s->special_fully_nested_mode = 0; + s->init4 = 0; + s->single_mode = 0; + /* Note: ELCR is not reset */ +} + static void pic_ioport_write(void *opaque, uint32_t addr, uint32_t val) { PicState *s = opaque; - int priority, cmd, irq, tmp; + int priority, cmd, irq; #ifdef DEBUG_PIC printf("pic_write: addr=0x%02x val=0x%02x\n", addr, val); @@ -228,14 +289,12 @@ static void pic_ioport_write(void *opaque, uint32_t addr, uint32_t val) if (addr == 0) { if (val & 0x10) { /* init */ - tmp = s->elcr_mask; - memset(s, 0, sizeof(PicState)); - s->elcr_mask = tmp; - + pic_reset(s); + /* deassert a pending interrupt */ + qemu_irq_lower(s->pics_state->parent_irq); s->init_state = 1; s->init4 = val & 1; - if (val & 0x02) - hw_error("single mode not supported"); + s->single_mode = val & 2; if (val & 0x08) hw_error("level sensitive irq not supported"); } else if (val & 0x08) { @@ -260,23 +319,23 @@ static void pic_ioport_write(void *opaque, uint32_t addr, uint32_t val) s->isr &= ~(1 << irq); if (cmd == 5) s->priority_add = (irq + 1) & 7; - pic_update_irq(); + pic_update_irq(s->pics_state); } break; case 3: irq = val & 7; s->isr &= ~(1 << irq); - pic_update_irq(); + pic_update_irq(s->pics_state); break; case 6: s->priority_add = (val + 1) & 7; - pic_update_irq(); + pic_update_irq(s->pics_state); break; case 7: irq = val & 7; s->isr &= ~(1 << irq); s->priority_add = (irq + 1) & 7; - pic_update_irq(); + pic_update_irq(s->pics_state); break; default: /* no operation */ @@ -288,11 +347,11 @@ static void pic_ioport_write(void *opaque, uint32_t addr, uint32_t val) case 0: /* normal mode */ s->imr = val; - pic_update_irq(); + pic_update_irq(s->pics_state); break; case 1: s->irq_base = val & 0xf8; - s->init_state = 2; + s->init_state = s->single_mode ? (s->init4 ? 3 : 0) : 2; break; case 2: if (s->init4) { @@ -317,16 +376,16 @@ static uint32_t pic_poll_read (PicState *s, uint32_t addr1) ret = pic_get_irq(s); if (ret >= 0) { if (addr1 >> 7) { - pics[0].isr &= ~(1 << 2); - pics[0].irr &= ~(1 << 2); + s->pics_state->pics[0].isr &= ~(1 << 2); + s->pics_state->pics[0].irr &= ~(1 << 2); } s->irr &= ~(1 << ret); s->isr &= ~(1 << ret); if (addr1 >> 7 || ret != 2) - pic_update_irq(); + pic_update_irq(s->pics_state); } else { ret = 0x07; - pic_update_irq(); + pic_update_irq(s->pics_state); } return ret; @@ -360,16 +419,17 @@ static uint32_t pic_ioport_read(void *opaque, uint32_t addr1) } /* memory mapped interrupt status */ -uint32_t pic_intack_read(CPUState *env) +/* XXX: may be the same than pic_read_irq() */ +uint32_t pic_intack_read(PicState2 *s) { int ret; - ret = pic_poll_read(&pics[0], 0x00); + ret = pic_poll_read(&s->pics[0], 0x00); if (ret == 2) - ret = pic_poll_read(&pics[1], 0x80) + 8; + ret = pic_poll_read(&s->pics[1], 0x80) + 8; /* Prepare for ISR read */ - pics[0].read_reg_select = 1; - + s->pics[0].read_reg_select = 1; + return ret; } @@ -388,7 +448,7 @@ static uint32_t elcr_ioport_read(void *opaque, uint32_t addr1) static void pic_save(QEMUFile *f, void *opaque) { PicState *s = opaque; - + qemu_put_8s(f, &s->last_irr); qemu_put_8s(f, &s->irr); qemu_put_8s(f, &s->imr); @@ -403,13 +463,14 @@ static void pic_save(QEMUFile *f, void *opaque) qemu_put_8s(f, &s->rotate_on_auto_eoi); qemu_put_8s(f, &s->special_fully_nested_mode); qemu_put_8s(f, &s->init4); + qemu_put_8s(f, &s->single_mode); qemu_put_8s(f, &s->elcr); } static int pic_load(QEMUFile *f, void *opaque, int version_id) { PicState *s = opaque; - + if (version_id != 1) return -EINVAL; @@ -427,6 +488,7 @@ static int pic_load(QEMUFile *f, void *opaque, int version_id) qemu_get_8s(f, &s->rotate_on_auto_eoi); qemu_get_8s(f, &s->special_fully_nested_mode); qemu_get_8s(f, &s->init4); + qemu_get_8s(f, &s->single_mode); qemu_get_8s(f, &s->elcr); return 0; } @@ -441,6 +503,7 @@ static void pic_init1(int io_addr, int elcr_addr, PicState *s) register_ioport_read(elcr_addr, 1, 1, elcr_ioport_read, s); } register_savevm("i8259", io_addr, 1, pic_save, pic_load, s); + qemu_register_reset(pic_reset, s); } void pic_info(void) @@ -448,20 +511,56 @@ void pic_info(void) int i; PicState *s; + if (!isa_pic) + return; + for(i=0;i<2;i++) { - s = &pics[i]; - term_printf("pic%d: irr=%02x imr=%02x isr=%02x hprio=%d irq_base=%02x rr_sel=%d elcr=%02x\n", - i, s->irr, s->imr, s->isr, s->priority_add, - s->irq_base, s->read_reg_select, s->elcr); + s = &isa_pic->pics[i]; + term_printf("pic%d: irr=%02x imr=%02x isr=%02x hprio=%d irq_base=%02x rr_sel=%d elcr=%02x fnm=%d\n", + i, s->irr, s->imr, s->isr, s->priority_add, + s->irq_base, s->read_reg_select, s->elcr, + s->special_fully_nested_mode); } } +void irq_info(void) +{ +#ifndef DEBUG_IRQ_COUNT + term_printf("irq statistic code not compiled.\n"); +#else + int i; + int64_t count; + + term_printf("IRQ statistics:\n"); + for (i = 0; i < 16; i++) { + count = irq_count[i]; + if (count > 0) + term_printf("%2d: %" PRId64 "\n", i, count); + } +#endif +} -void pic_init(void) +qemu_irq *i8259_init(qemu_irq parent_irq) { - pic_init1(0x20, 0x4d0, &pics[0]); - pic_init1(0xa0, 0x4d1, &pics[1]); - pics[0].elcr_mask = 0xf8; - pics[1].elcr_mask = 0xde; + PicState2 *s; + + s = qemu_mallocz(sizeof(PicState2)); + if (!s) + return NULL; + pic_init1(0x20, 0x4d0, &s->pics[0]); + pic_init1(0xa0, 0x4d1, &s->pics[1]); + s->pics[0].elcr_mask = 0xf8; + s->pics[1].elcr_mask = 0xde; + s->parent_irq = parent_irq; + s->pics[0].pics_state = s; + s->pics[1].pics_state = s; + isa_pic = s; + return qemu_allocate_irqs(i8259_set_irq, s, 16); } +void pic_set_alt_irq_func(PicState2 *s, SetIRQFunc *alt_irq_func, + void *alt_irq_opaque) +{ + s->alt_irq_func = alt_irq_func; + s->alt_irq_opaque = alt_irq_opaque; +}