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Annotation of qemu/hw/heathrow_pic.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Heathrow PIC support (standard PowerMac PIC)
        !             3:  * 
        !             4:  * Copyright (c) 2005 Fabrice Bellard
        !             5:  * 
        !             6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
        !             7:  * of this software and associated documentation files (the "Software"), to deal
        !             8:  * in the Software without restriction, including without limitation the rights
        !             9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
        !            10:  * copies of the Software, and to permit persons to whom the Software is
        !            11:  * furnished to do so, subject to the following conditions:
        !            12:  *
        !            13:  * The above copyright notice and this permission notice shall be included in
        !            14:  * all copies or substantial portions of the Software.
        !            15:  *
        !            16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        !            17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
        !            19:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
        !            21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
        !            22:  * THE SOFTWARE.
        !            23:  */
        !            24: #include "vl.h"
        !            25: 
        !            26: //#define DEBUG
        !            27: 
        !            28: typedef struct HeathrowPIC {
        !            29:     uint32_t events;
        !            30:     uint32_t mask;
        !            31:     uint32_t levels;
        !            32:     uint32_t level_triggered;
        !            33: } HeathrowPIC;
        !            34: 
        !            35: struct HeathrowPICS {
        !            36:     HeathrowPIC pics[2];
        !            37: };
        !            38: 
        !            39: static inline int check_irq(HeathrowPIC *pic)
        !            40: {
        !            41:     return (pic->events | (pic->levels & pic->level_triggered)) & pic->mask;
        !            42: }
        !            43: 
        !            44: /* update the CPU irq state */
        !            45: static void heathrow_pic_update(HeathrowPICS *s)
        !            46: {
        !            47:     if (check_irq(&s->pics[0]) || check_irq(&s->pics[1])) {
        !            48:         cpu_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
        !            49:     } else {
        !            50:         cpu_reset_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
        !            51:     }
        !            52: }
        !            53: 
        !            54: static void pic_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
        !            55: {
        !            56:     HeathrowPICS *s = opaque;
        !            57:     HeathrowPIC *pic;
        !            58:     unsigned int n;
        !            59: 
        !            60:     value = bswap32(value);
        !            61: #ifdef DEBUG
        !            62:     printf("pic_writel: %08x: %08x\n",
        !            63:            addr, value);
        !            64: #endif
        !            65:     n = ((addr & 0xfff) - 0x10) >> 4;
        !            66:     if (n >= 2)
        !            67:         return;
        !            68:     pic = &s->pics[n];
        !            69:     switch(addr & 0xf) {
        !            70:     case 0x04:
        !            71:         pic->mask = value;
        !            72:         heathrow_pic_update(s);
        !            73:         break;
        !            74:     case 0x08:
        !            75:         /* do not reset level triggered IRQs */
        !            76:         value &= ~pic->level_triggered;
        !            77:         pic->events &= ~value;
        !            78:         heathrow_pic_update(s);
        !            79:         break;
        !            80:     default:
        !            81:         break;
        !            82:     }
        !            83: }
        !            84: 
        !            85: static uint32_t pic_readl (void *opaque, target_phys_addr_t addr)
        !            86: {
        !            87:     HeathrowPICS *s = opaque;
        !            88:     HeathrowPIC *pic;
        !            89:     unsigned int n;
        !            90:     uint32_t value;
        !            91:     
        !            92:     n = ((addr & 0xfff) - 0x10) >> 4;
        !            93:     if (n >= 2) {
        !            94:         value = 0;
        !            95:     } else {
        !            96:         pic = &s->pics[n];
        !            97:         switch(addr & 0xf) {
        !            98:         case 0x0:
        !            99:             value = pic->events;
        !           100:             break;
        !           101:         case 0x4:
        !           102:             value = pic->mask;
        !           103:             break;
        !           104:         case 0xc:
        !           105:             value = pic->levels;
        !           106:             break;
        !           107:         default:
        !           108:             value = 0;
        !           109:             break;
        !           110:         }
        !           111:     }
        !           112: #ifdef DEBUG
        !           113:     printf("pic_readl: %08x: %08x\n",
        !           114:            addr, value);
        !           115: #endif
        !           116:     value = bswap32(value);
        !           117:     return value;
        !           118: }
        !           119: 
        !           120: static CPUWriteMemoryFunc *pic_write[] = {
        !           121:     &pic_writel,
        !           122:     &pic_writel,
        !           123:     &pic_writel,
        !           124: };
        !           125: 
        !           126: static CPUReadMemoryFunc *pic_read[] = {
        !           127:     &pic_readl,
        !           128:     &pic_readl,
        !           129:     &pic_readl,
        !           130: };
        !           131: 
        !           132: 
        !           133: void heathrow_pic_set_irq(void *opaque, int num, int level)
        !           134: {
        !           135:     HeathrowPICS *s = opaque;
        !           136:     HeathrowPIC *pic;
        !           137:     unsigned int irq_bit;
        !           138: 
        !           139: #if defined(DEBUG)
        !           140:     {
        !           141:         static int last_level[64];
        !           142:         if (last_level[num] != level) {
        !           143:             printf("set_irq: num=0x%02x level=%d\n", num, level);
        !           144:             last_level[num] = level;
        !           145:         }
        !           146:     }
        !           147: #endif
        !           148:     pic = &s->pics[1 - (num >> 5)];
        !           149:     irq_bit = 1 << (num & 0x1f);
        !           150:     if (level) {
        !           151:         pic->events |= irq_bit & ~pic->level_triggered;
        !           152:         pic->levels |= irq_bit;
        !           153:     } else {
        !           154:         pic->levels &= ~irq_bit;
        !           155:     }
        !           156:     heathrow_pic_update(s);
        !           157: }
        !           158: 
        !           159: HeathrowPICS *heathrow_pic_init(int *pmem_index)
        !           160: {
        !           161:     HeathrowPICS *s;
        !           162:     
        !           163:     s = qemu_mallocz(sizeof(HeathrowPICS));
        !           164:     s->pics[0].level_triggered = 0;
        !           165:     s->pics[1].level_triggered = 0x1ff00000;
        !           166:     *pmem_index = cpu_register_io_memory(0, pic_read, pic_write, s);
        !           167:     return s;
        !           168: }

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