diff options
Diffstat (limited to 'hw/slavio_intctl.c')
| -rw-r--r-- | hw/slavio_intctl.c | 400 |
1 files changed, 400 insertions, 0 deletions
diff --git a/hw/slavio_intctl.c b/hw/slavio_intctl.c new file mode 100644 index 0000000..288fb50 --- /dev/null +++ b/hw/slavio_intctl.c @@ -0,0 +1,400 @@ +/* + * QEMU Sparc SLAVIO interrupt controller emulation + * + * Copyright (c) 2003-2005 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 + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ +#include "vl.h" +//#define DEBUG_IRQ_COUNT +//#define DEBUG_IRQ + +#ifdef DEBUG_IRQ +#define DPRINTF(fmt, args...) \ +do { printf("IRQ: " fmt , ##args); } while (0) +#else +#define DPRINTF(fmt, args...) +#endif + +/* + * Registers of interrupt controller in sun4m. + * + * This is the interrupt controller part of chip STP2001 (Slave I/O), also + * produced as NCR89C105. See + * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt + * + * There is a system master controller and one for each cpu. + * + */ + +#define MAX_CPUS 16 + +typedef struct SLAVIO_INTCTLState { + uint32_t intreg_pending[MAX_CPUS]; + uint32_t intregm_pending; + uint32_t intregm_disabled; + uint32_t target_cpu; +#ifdef DEBUG_IRQ_COUNT + uint64_t irq_count[32]; +#endif + CPUState *cpu_envs[MAX_CPUS]; +} SLAVIO_INTCTLState; + +#define INTCTL_MAXADDR 0xf +#define INTCTLM_MAXADDR 0xf +static void slavio_check_interrupts(void *opaque); + +// per-cpu interrupt controller +static uint32_t slavio_intctl_mem_readl(void *opaque, target_phys_addr_t addr) +{ + SLAVIO_INTCTLState *s = opaque; + uint32_t saddr; + int cpu; + + cpu = (addr & (MAX_CPUS - 1) * TARGET_PAGE_SIZE) >> 12; + saddr = (addr & INTCTL_MAXADDR) >> 2; + switch (saddr) { + case 0: + return s->intreg_pending[cpu]; + default: + break; + } + return 0; +} + +static void slavio_intctl_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val) +{ + SLAVIO_INTCTLState *s = opaque; + uint32_t saddr; + int cpu; + + cpu = (addr & (MAX_CPUS - 1) * TARGET_PAGE_SIZE) >> 12; + saddr = (addr & INTCTL_MAXADDR) >> 2; + switch (saddr) { + case 1: // clear pending softints + if (val & 0x4000) + val |= 80000000; + val &= 0xfffe0000; + s->intreg_pending[cpu] &= ~val; + DPRINTF("Cleared cpu %d irq mask %x, curmask %x\n", cpu, val, s->intreg_pending[cpu]); + break; + case 2: // set softint + val &= 0xfffe0000; + s->intreg_pending[cpu] |= val; + slavio_check_interrupts(s); + DPRINTF("Set cpu %d irq mask %x, curmask %x\n", cpu, val, s->intreg_pending[cpu]); + break; + default: + break; + } +} + +static CPUReadMemoryFunc *slavio_intctl_mem_read[3] = { + slavio_intctl_mem_readl, + slavio_intctl_mem_readl, + slavio_intctl_mem_readl, +}; + +static CPUWriteMemoryFunc *slavio_intctl_mem_write[3] = { + slavio_intctl_mem_writel, + slavio_intctl_mem_writel, + slavio_intctl_mem_writel, +}; + +// master system interrupt controller +static uint32_t slavio_intctlm_mem_readl(void *opaque, target_phys_addr_t addr) +{ + SLAVIO_INTCTLState *s = opaque; + uint32_t saddr; + + saddr = (addr & INTCTLM_MAXADDR) >> 2; + switch (saddr) { + case 0: + return s->intregm_pending & 0x7fffffff; + case 1: + return s->intregm_disabled; + case 4: + return s->target_cpu; + default: + break; + } + return 0; +} + +static void slavio_intctlm_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val) +{ + SLAVIO_INTCTLState *s = opaque; + uint32_t saddr; + + saddr = (addr & INTCTLM_MAXADDR) >> 2; + switch (saddr) { + case 2: // clear (enable) + // Force clear unused bits + val &= ~0x4fb2007f; + s->intregm_disabled &= ~val; + DPRINTF("Enabled master irq mask %x, curmask %x\n", val, s->intregm_disabled); + slavio_check_interrupts(s); + break; + case 3: // set (disable, clear pending) + // Force clear unused bits + val &= ~0x4fb2007f; + s->intregm_disabled |= val; + s->intregm_pending &= ~val; + DPRINTF("Disabled master irq mask %x, curmask %x\n", val, s->intregm_disabled); + break; + case 4: + s->target_cpu = val & (MAX_CPUS - 1); + DPRINTF("Set master irq cpu %d\n", s->target_cpu); + break; + default: + break; + } +} + +static CPUReadMemoryFunc *slavio_intctlm_mem_read[3] = { + slavio_intctlm_mem_readl, + slavio_intctlm_mem_readl, + slavio_intctlm_mem_readl, +}; + +static CPUWriteMemoryFunc *slavio_intctlm_mem_write[3] = { + slavio_intctlm_mem_writel, + slavio_intctlm_mem_writel, + slavio_intctlm_mem_writel, +}; + +void slavio_pic_info(void *opaque) +{ + SLAVIO_INTCTLState *s = opaque; + int i; + + for (i = 0; i < MAX_CPUS; i++) { + term_printf("per-cpu %d: pending 0x%08x\n", i, s->intreg_pending[i]); + } + term_printf("master: pending 0x%08x, disabled 0x%08x\n", s->intregm_pending, s->intregm_disabled); +} + +void slavio_irq_info(void *opaque) +{ +#ifndef DEBUG_IRQ_COUNT + term_printf("irq statistic code not compiled.\n"); +#else + SLAVIO_INTCTLState *s = opaque; + int i; + int64_t count; + + term_printf("IRQ statistics:\n"); + for (i = 0; i < 32; i++) { + count = s->irq_count[i]; + if (count > 0) + term_printf("%2d: %" PRId64 "\n", i, count); + } +#endif +} + +static const uint32_t intbit_to_level[32] = { + 2, 3, 5, 7, 9, 11, 0, 14, 3, 5, 7, 9, 11, 13, 12, 12, + 6, 0, 4, 10, 8, 0, 11, 0, 0, 0, 0, 0, 15, 0, 15, 0, +}; + +static void slavio_check_interrupts(void *opaque) +{ + CPUState *env; + SLAVIO_INTCTLState *s = opaque; + uint32_t pending = s->intregm_pending; + unsigned int i, j, max = 0; + + pending &= ~s->intregm_disabled; + + if (pending && !(s->intregm_disabled & 0x80000000)) { + for (i = 0; i < 32; i++) { + if (pending & (1 << i)) { + if (max < intbit_to_level[i]) + max = intbit_to_level[i]; + } + } + env = s->cpu_envs[s->target_cpu]; + if (!env) { + DPRINTF("No CPU %d, not triggered (pending %x)\n", s->target_cpu, pending); + } + else { + if (env->halted) + env->halted = 0; + if (env->interrupt_index == 0) { + DPRINTF("Triggered CPU %d pil %d\n", s->target_cpu, max); +#ifdef DEBUG_IRQ_COUNT + s->irq_count[max]++; +#endif + env->interrupt_index = TT_EXTINT | max; + cpu_interrupt(env, CPU_INTERRUPT_HARD); + } + else + DPRINTF("Not triggered (pending %x), pending exception %x\n", pending, env->interrupt_index); + } + } + else + DPRINTF("Not triggered (pending %x), disabled %x\n", pending, s->intregm_disabled); + + for (i = 0; i < MAX_CPUS; i++) { + max = 0; + env = s->cpu_envs[i]; + if (!env) + continue; + for (j = 17; j < 32; j++) { + if (s->intreg_pending[i] & (1 << j)) { + if (max < j - 16) + max = j - 16; + } + } + if (max > 0) { + if (env->halted) + env->halted = 0; + if (env->interrupt_index == 0) { + DPRINTF("Triggered softint %d for cpu %d (pending %x)\n", max, i, pending); +#ifdef DEBUG_IRQ_COUNT + s->irq_count[max]++; +#endif + env->interrupt_index = TT_EXTINT | max; + cpu_interrupt(env, CPU_INTERRUPT_HARD); + } + } + } +} + +/* + * "irq" here is the bit number in the system interrupt register to + * separate serial and keyboard interrupts sharing a level. + */ +void slavio_pic_set_irq(void *opaque, int irq, int level) +{ + SLAVIO_INTCTLState *s = opaque; + + DPRINTF("Set cpu %d irq %d level %d\n", s->target_cpu, irq, level); + if (irq < 32) { + uint32_t mask = 1 << irq; + uint32_t pil = intbit_to_level[irq]; + if (pil > 0) { + if (level) { + s->intregm_pending |= mask; + s->intreg_pending[s->target_cpu] |= 1 << pil; + } + else { + s->intregm_pending &= ~mask; + s->intreg_pending[s->target_cpu] &= ~(1 << pil); + } + } + } + slavio_check_interrupts(s); +} + +void slavio_pic_set_irq_cpu(void *opaque, int irq, int level, unsigned int cpu) +{ + SLAVIO_INTCTLState *s = opaque; + + DPRINTF("Set cpu %d local irq %d level %d\n", cpu, irq, level); + if (cpu == (unsigned int)-1) { + slavio_pic_set_irq(opaque, irq, level); + return; + } + if (irq < 32) { + uint32_t pil = intbit_to_level[irq]; + if (pil > 0) { + if (level) { + s->intreg_pending[cpu] |= 1 << pil; + } + else { + s->intreg_pending[cpu] &= ~(1 << pil); + } + } + } + slavio_check_interrupts(s); +} + +static void slavio_intctl_save(QEMUFile *f, void *opaque) +{ + SLAVIO_INTCTLState *s = opaque; + int i; + + for (i = 0; i < MAX_CPUS; i++) { + qemu_put_be32s(f, &s->intreg_pending[i]); + } + qemu_put_be32s(f, &s->intregm_pending); + qemu_put_be32s(f, &s->intregm_disabled); + qemu_put_be32s(f, &s->target_cpu); +} + +static int slavio_intctl_load(QEMUFile *f, void *opaque, int version_id) +{ + SLAVIO_INTCTLState *s = opaque; + int i; + + if (version_id != 1) + return -EINVAL; + + for (i = 0; i < MAX_CPUS; i++) { + qemu_get_be32s(f, &s->intreg_pending[i]); + } + qemu_get_be32s(f, &s->intregm_pending); + qemu_get_be32s(f, &s->intregm_disabled); + qemu_get_be32s(f, &s->target_cpu); + return 0; +} + +static void slavio_intctl_reset(void *opaque) +{ + SLAVIO_INTCTLState *s = opaque; + int i; + + for (i = 0; i < MAX_CPUS; i++) { + s->intreg_pending[i] = 0; + } + s->intregm_disabled = ~0xffb2007f; + s->intregm_pending = 0; + s->target_cpu = 0; +} + +void slavio_intctl_set_cpu(void *opaque, unsigned int cpu, CPUState *env) +{ + SLAVIO_INTCTLState *s = opaque; + s->cpu_envs[cpu] = env; +} + +void *slavio_intctl_init(uint32_t addr, uint32_t addrg) +{ + int slavio_intctl_io_memory, slavio_intctlm_io_memory, i; + SLAVIO_INTCTLState *s; + + s = qemu_mallocz(sizeof(SLAVIO_INTCTLState)); + if (!s) + return NULL; + + for (i = 0; i < MAX_CPUS; i++) { + slavio_intctl_io_memory = cpu_register_io_memory(0, slavio_intctl_mem_read, slavio_intctl_mem_write, s); + cpu_register_physical_memory(addr + i * TARGET_PAGE_SIZE, INTCTL_MAXADDR, slavio_intctl_io_memory); + } + + slavio_intctlm_io_memory = cpu_register_io_memory(0, slavio_intctlm_mem_read, slavio_intctlm_mem_write, s); + cpu_register_physical_memory(addrg, INTCTLM_MAXADDR, slavio_intctlm_io_memory); + + register_savevm("slavio_intctl", addr, 1, slavio_intctl_save, slavio_intctl_load, s); + qemu_register_reset(slavio_intctl_reset, s); + slavio_intctl_reset(s); + return s; +} + |