/* * This file is part of the Palacios Virtual Machine Monitor developed * by the V3VEE Project with funding from the United States National * Science Foundation and the Department of Energy. * * The V3VEE Project is a joint project between Northwestern University * and the University of New Mexico. You can find out more at * http://www.v3vee.org * * Copyright (c) 2008, Jack Lange * Copyright (c) 2008, The V3VEE Project * All rights reserved. * * Author: Jack Lange * * This is free software. You are permitted to use, * redistribute, and modify it as specified in the file "V3VEE_LICENSE". */ #include #include #include #include #include #ifndef CONFIG_DEBUG_IO_APIC #undef PrintDebug #define PrintDebug(fmt, args...) #endif #define IO_APIC_BASE_ADDR 0xfec00000 #define IOAPIC_ID_REG 0x00 #define IOAPIC_VER_REG 0x01 #define IOAPIC_ARB_REG 0x02 #define IOAPIC_REDIR_BASE_REG 0x10 #define REDIR_LO_MASK ~0x00005000 struct ioapic_reg_sel { union { uint32_t val; struct { uint_t reg_addr : 8; uint_t rsvd : 24; } __attribute__((packed)); } __attribute__((packed)); } __attribute__((packed)); struct ioapic_id_reg { union { uint32_t val; struct { uint_t rsvd1 : 24; uint_t id : 4; uint_t rsvd2 : 4; } __attribute__((packed)); } __attribute__((packed)); } __attribute__((packed)); struct ioapic_ver_reg { union { uint32_t val; struct { uint_t version : 8; uint_t rsvd1 : 8; uint_t max_redir : 8; uint_t rsvd2 : 8; } __attribute__((packed)); } __attribute__((packed)); } __attribute__((packed)); struct ioapic_arb_reg { union { uint32_t val; struct { uint_t rsvd1 : 24; uint_t max_redir : 4; uint_t rsvd2 : 4; } __attribute__((packed)); } __attribute__((packed)); } __attribute__((packed)); struct redir_tbl_entry { union { uint64_t val; struct { uint32_t lo; uint32_t hi; } __attribute__((packed)); struct { uint_t vec : 8; #define FIXED 0x0 #define LOWEST_PRIOR 0x1 #define SMI 0x2 #define NMI 0x4 #define INIT 0x5 #define EXTINT 0x7 uint_t del_mode : 3; #define PHSYICAL_DST_MODE 0 #define LOGICAL_DST_MODE 1 uint_t dst_mode : 1; uint_t del_status : 1; #define HIGH_ACTIVE 0 #define LOW_ACTIVE 1 uint_t intr_pol : 1; uint_t rem_irr : 1; uint_t trig_mode : 1; uint_t mask : 1; uint64_t rsvd : 39; uint_t dst_field : 8; } __attribute__((packed)); } __attribute__((packed)); } __attribute__((packed)); struct io_apic_state { addr_t base_addr; uint32_t index_reg; struct ioapic_id_reg ioapic_id; struct ioapic_ver_reg ioapic_ver; struct ioapic_arb_reg ioapic_arb_id; struct redir_tbl_entry redir_tbl[24]; struct vm_device * icc_bus; }; static void init_ioapic_state(struct io_apic_state * ioapic, uint32_t id) { int i = 0; ioapic->base_addr = IO_APIC_BASE_ADDR; ioapic->index_reg = 0; ioapic->ioapic_id.id = id; ioapic->ioapic_ver.val = 0x00170011; ioapic->ioapic_arb_id.val = 0x00000000; for (i = 0; i < 24; i++) { ioapic->redir_tbl[i].val = 0x0001000000000000LL; // Mask all interrupts until they are enabled.... ioapic->redir_tbl[i].mask = 1; } // special case redir_tbl[0] for pin 0 as ExtInt for Virtual Wire Mode // ioapic->redir_tbl[0].del_mode=EXTINT; // ioapic->redir_tbl[0].mask=0; } static int ioapic_read(struct guest_info * core, addr_t guest_addr, void * dst, uint_t length, void * priv_data) { struct vm_device * dev = (struct vm_device *)priv_data; struct io_apic_state * ioapic = (struct io_apic_state *)(dev->private_data); uint32_t reg_tgt = guest_addr - ioapic->base_addr; uint32_t * op_val = (uint32_t *)dst; PrintDebug("ioapic %u: IOAPIC Read at %p\n", ioapic->ioapic_id.id, (void *)guest_addr); if (reg_tgt == 0x00) { *op_val = ioapic->index_reg; } else if (reg_tgt == 0x10) { // IOWIN register switch (ioapic->index_reg) { case IOAPIC_ID_REG: *op_val = ioapic->ioapic_id.val; break; case IOAPIC_VER_REG: *op_val = ioapic->ioapic_ver.val; break; case IOAPIC_ARB_REG: *op_val = ioapic->ioapic_arb_id.val; break; default: { uint_t redir_index = (ioapic->index_reg - IOAPIC_REDIR_BASE_REG) >> 1; uint_t hi_val = (ioapic->index_reg - IOAPIC_REDIR_BASE_REG) & 1; if (redir_index > 0x3f) { PrintError("ioapic %u: Invalid redirection table entry %x\n", ioapic->ioapic_id.id, (uint32_t)redir_index); return -1; } if (hi_val) { *op_val = ioapic->redir_tbl[redir_index].hi; } else { *op_val = ioapic->redir_tbl[redir_index].lo; } } } } PrintDebug("ioapic %u: IOAPIC Read at %p gave value 0x%x\n", ioapic->ioapic_id.id, (void *)guest_addr, *op_val); return length; } static int ioapic_write(struct guest_info * core, addr_t guest_addr, void * src, uint_t length, void * priv_data) { struct vm_device * dev = (struct vm_device *)priv_data; struct io_apic_state * ioapic = (struct io_apic_state *)(dev->private_data); uint32_t reg_tgt = guest_addr - ioapic->base_addr; uint32_t op_val = *(uint32_t *)src; PrintDebug("ioapic %u: IOAPIC Write at %p (val = %d)\n", ioapic->ioapic_id.id, (void *)guest_addr, *(uint32_t *)src); if (reg_tgt == 0x00) { PrintDebug("ioapic %u: Setting ioapic index register to 0x%x.\n", ioapic->ioapic_id.id, op_val); ioapic->index_reg = op_val; } else if (reg_tgt == 0x10) { // IOWIN register switch (ioapic->index_reg) { case IOAPIC_ID_REG: // What does this do to our relationship with the ICC bus? ioapic->ioapic_id.val = op_val; break; case IOAPIC_VER_REG: // GPF/PageFault/Ignore? PrintError("ioapic %u: Writing to read only IOAPIC register\n", ioapic->ioapic_id.id); return -1; case IOAPIC_ARB_REG: ioapic->ioapic_arb_id.val = op_val; break; default: { uint_t redir_index = (ioapic->index_reg - IOAPIC_REDIR_BASE_REG) >> 1; uint_t hi_val = (ioapic->index_reg - IOAPIC_REDIR_BASE_REG) & 1; PrintDebug("ioapic %u: Writing value 0x%x to redirection entry %u (%s)\n", ioapic->ioapic_id.id, op_val, redir_index, hi_val ? "hi" : "low"); if (redir_index > 0x3f) { PrintError("ioapic %u: Invalid redirection table entry %x\n", ioapic->ioapic_id.id, (uint32_t)redir_index); return -1; } if (hi_val) { PrintDebug("ioapic %u: Writing to hi of pin %d\n", ioapic->ioapic_id.val, redir_index); ioapic->redir_tbl[redir_index].hi = op_val; } else { PrintDebug("ioapic %u: Writing to lo of pin %d\n", ioapic->ioapic_id.id, redir_index); op_val &= REDIR_LO_MASK; ioapic->redir_tbl[redir_index].lo &= ~REDIR_LO_MASK; ioapic->redir_tbl[redir_index].lo |= op_val; } } } } return length; } static int ioapic_raise_irq(struct v3_vm_info * vm, void * private_data, int irq) { struct vm_device * dev = (struct vm_device *)private_data; struct io_apic_state * ioapic = (struct io_apic_state *)(dev->private_data); struct redir_tbl_entry * irq_entry = NULL; if (irq > 24) { PrintDebug("ioapic %u: IRQ out of range of IO APIC\n", ioapic->ioapic_id.id); return -1; } irq_entry = &(ioapic->redir_tbl[irq]); if (irq_entry->mask == 0) { PrintDebug("ioapic %u: IOAPIC Signalling APIC to raise INTR %d\n", ioapic->ioapic_id.id, irq_entry->vec); // the format of the redirection table entry is just slightly // different than that of the lapic's cmd register, which is the other // way an IPI is initiated. So we will translate // struct int_cmd_reg icr; icr.val = irq_entry->val; icr.rsvd1=0; icr.lvl=1; icr.trig_mode=irq_entry->trig_mode; icr.rem_rd_status=0; icr.dst_shorthand=0; // no shorthand icr.rsvd2=0; // Note: 0 yhere is "cluster model", but it should be irrelevant // since we are sending this as a physical destination PrintDebug("io apic %u: raising irq %u on ICC bus.\n", ioapic->ioapic_id.id, irq); v3_icc_send_ipi(ioapic->icc_bus, ioapic->ioapic_id.id,icr.val, 0, irq); } return 0; } /* I don't know if we can do anything here.... */ static int ioapic_lower_irq(struct v3_vm_info * vm, void * private_data, int irq) { return 0; } static struct intr_router_ops router_ops = { .raise_intr = ioapic_raise_irq, .lower_intr = ioapic_lower_irq, }; static int io_apic_free(struct vm_device * dev) { // struct guest_info * info = dev->vm; return 0; } static struct v3_device_ops dev_ops = { .free = io_apic_free, .reset = NULL, .start = NULL, .stop = NULL, }; static int ioapic_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) { struct vm_device * icc_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus")); char * dev_id = v3_cfg_val(cfg, "ID"); if (!icc_bus) { PrintError("ioapic: Could not locate ICC BUS device (%s)\n", v3_cfg_val(cfg, "bus")); return -1; } PrintDebug("ioapic: Creating IO APIC\n"); struct io_apic_state * ioapic = (struct io_apic_state *)V3_Malloc(sizeof(struct io_apic_state)); ioapic->icc_bus = icc_bus; struct vm_device * dev = v3_allocate_device(dev_id, &dev_ops, ioapic); if (v3_attach_device(vm, dev) == -1) { PrintError("ioapic: Could not attach device %s\n", dev_id); return -1; } v3_register_intr_router(vm, &router_ops, dev); init_ioapic_state(ioapic,vm->num_cores); v3_icc_register_ioapic(vm,icc_bus,ioapic->ioapic_id.id); v3_hook_full_mem(vm, V3_MEM_CORE_ANY, ioapic->base_addr, ioapic->base_addr + PAGE_SIZE_4KB, ioapic_read, ioapic_write, dev); return 0; } device_register("IOAPIC", ioapic_init)