root / hw / heathrow_pic.c @ 0986ac3b
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/*
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* Heathrow PIC support (standard PowerMac PIC)
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*
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* Copyright (c) 2005 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "vl.h" |
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//#define DEBUG
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typedef struct HeathrowPIC { |
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uint32_t events; |
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uint32_t mask; |
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uint32_t levels; |
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uint32_t level_triggered; |
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} HeathrowPIC; |
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struct HeathrowPICS {
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HeathrowPIC pics[2];
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}; |
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static inline int check_irq(HeathrowPIC *pic) |
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{ |
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return (pic->events | (pic->levels & pic->level_triggered)) & pic->mask;
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} |
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/* update the CPU irq state */
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static void heathrow_pic_update(HeathrowPICS *s) |
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{ |
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if (check_irq(&s->pics[0]) || check_irq(&s->pics[1])) { |
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cpu_interrupt(first_cpu, CPU_INTERRUPT_HARD); |
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} else {
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cpu_reset_interrupt(first_cpu, CPU_INTERRUPT_HARD); |
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} |
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} |
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static void pic_writel (void *opaque, target_phys_addr_t addr, uint32_t value) |
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{ |
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HeathrowPICS *s = opaque; |
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HeathrowPIC *pic; |
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unsigned int n; |
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value = bswap32(value); |
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#ifdef DEBUG
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printf("pic_writel: %08x: %08x\n",
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addr, value); |
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#endif
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n = ((addr & 0xfff) - 0x10) >> 4; |
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if (n >= 2) |
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return;
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pic = &s->pics[n]; |
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switch(addr & 0xf) { |
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case 0x04: |
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pic->mask = value; |
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heathrow_pic_update(s); |
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break;
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case 0x08: |
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/* do not reset level triggered IRQs */
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value &= ~pic->level_triggered; |
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pic->events &= ~value; |
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heathrow_pic_update(s); |
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break;
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default:
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break;
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} |
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} |
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static uint32_t pic_readl (void *opaque, target_phys_addr_t addr) |
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{ |
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HeathrowPICS *s = opaque; |
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HeathrowPIC *pic; |
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unsigned int n; |
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uint32_t value; |
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n = ((addr & 0xfff) - 0x10) >> 4; |
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if (n >= 2) { |
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value = 0;
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} else {
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pic = &s->pics[n]; |
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switch(addr & 0xf) { |
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case 0x0: |
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value = pic->events; |
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break;
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case 0x4: |
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value = pic->mask; |
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break;
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case 0xc: |
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value = pic->levels; |
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break;
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default:
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value = 0;
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break;
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} |
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} |
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#ifdef DEBUG
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printf("pic_readl: %08x: %08x\n",
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addr, value); |
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#endif
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value = bswap32(value); |
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return value;
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} |
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static CPUWriteMemoryFunc *pic_write[] = {
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&pic_writel, |
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&pic_writel, |
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&pic_writel, |
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}; |
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static CPUReadMemoryFunc *pic_read[] = {
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&pic_readl, |
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&pic_readl, |
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&pic_readl, |
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}; |
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void heathrow_pic_set_irq(void *opaque, int num, int level) |
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{ |
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HeathrowPICS *s = opaque; |
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HeathrowPIC *pic; |
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unsigned int irq_bit; |
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#if defined(DEBUG)
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{ |
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static int last_level[64]; |
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if (last_level[num] != level) {
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printf("set_irq: num=0x%02x level=%d\n", num, level);
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last_level[num] = level; |
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} |
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} |
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#endif
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pic = &s->pics[1 - (num >> 5)]; |
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irq_bit = 1 << (num & 0x1f); |
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if (level) {
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pic->events |= irq_bit & ~pic->level_triggered; |
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pic->levels |= irq_bit; |
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} else {
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pic->levels &= ~irq_bit; |
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} |
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heathrow_pic_update(s); |
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} |
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HeathrowPICS *heathrow_pic_init(int *pmem_index)
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{ |
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HeathrowPICS *s; |
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s = qemu_mallocz(sizeof(HeathrowPICS));
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s->pics[0].level_triggered = 0; |
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s->pics[1].level_triggered = 0x1ff00000; |
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*pmem_index = cpu_register_io_memory(0, pic_read, pic_write, s);
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return s;
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} |