hw/misc/tz-mpc.c - third_party/qemu - Git at Google

 /*
  * ARM AHB5 TrustZone Memory Protection Controller emulation
  *
  * Copyright (c) 2018 Linaro Limited
  * Written by Peter Maydell
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 or
  * (at your option) any later version.
  */

 #include "qemu/osdep.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
 #include "qapi/error.h"
 #include "trace.h"
 #include "hw/sysbus.h"
 #include "migration/vmstate.h"
 #include "hw/registerfields.h"
 #include "hw/irq.h"
 #include "hw/misc/tz-mpc.h"
 #include "hw/qdev-properties.h"

 /* Our IOMMU has two IOMMU indexes, one for secure transactions and one for
  * non-secure transactions.
  */
 enum {
     IOMMU_IDX_S,
     IOMMU_IDX_NS,
     IOMMU_NUM_INDEXES,
 };

 /* Config registers */
 REG32(CTRL, 0x00)
     FIELD(CTRL, SEC_RESP, 4, 1)
     FIELD(CTRL, AUTOINC, 8, 1)
     FIELD(CTRL, LOCKDOWN, 31, 1)
 REG32(BLK_MAX, 0x10)
 REG32(BLK_CFG, 0x14)
 REG32(BLK_IDX, 0x18)
 REG32(BLK_LUT, 0x1c)
 REG32(INT_STAT, 0x20)
     FIELD(INT_STAT, IRQ, 0, 1)
 REG32(INT_CLEAR, 0x24)
     FIELD(INT_CLEAR, IRQ, 0, 1)
 REG32(INT_EN, 0x28)
     FIELD(INT_EN, IRQ, 0, 1)
 REG32(INT_INFO1, 0x2c)
 REG32(INT_INFO2, 0x30)
     FIELD(INT_INFO2, HMASTER, 0, 16)
     FIELD(INT_INFO2, HNONSEC, 16, 1)
     FIELD(INT_INFO2, CFG_NS, 17, 1)
 REG32(INT_SET, 0x34)
     FIELD(INT_SET, IRQ, 0, 1)
 REG32(PIDR4, 0xfd0)
 REG32(PIDR5, 0xfd4)
 REG32(PIDR6, 0xfd8)
 REG32(PIDR7, 0xfdc)
 REG32(PIDR0, 0xfe0)
 REG32(PIDR1, 0xfe4)
 REG32(PIDR2, 0xfe8)
 REG32(PIDR3, 0xfec)
 REG32(CIDR0, 0xff0)
 REG32(CIDR1, 0xff4)
 REG32(CIDR2, 0xff8)
 REG32(CIDR3, 0xffc)

 static const uint8_t tz_mpc_idregs[] = {
     0x04, 0x00, 0x00, 0x00,
     0x60, 0xb8, 0x1b, 0x00,
     0x0d, 0xf0, 0x05, 0xb1,
 };

 static void tz_mpc_irq_update(TZMPC *s)
 {
     qemu_set_irq(s->irq, s->int_stat && s->int_en);
 }

 static void tz_mpc_iommu_notify(TZMPC *s, uint32_t lutidx,
                                 uint32_t oldlut, uint32_t newlut)
 {
     /* Called when the LUT word at lutidx has changed from oldlut to newlut;
      * must call the IOMMU notifiers for the changed blocks.
      */
     IOMMUTLBEvent event = {
         .entry = {
             .addr_mask = s->blocksize - 1,
         }
     };
     hwaddr addr = lutidx * s->blocksize * 32;
     int i;

     for (i = 0; i < 32; i++, addr += s->blocksize) {
         bool block_is_ns;

         if (!((oldlut ^ newlut) & (1 << i))) {
             continue;
         }
         /* This changes the mappings for both the S and the NS space,
          * so we need to do four notifies: an UNMAP then a MAP for each.
          */
         block_is_ns = newlut & (1 << i);

         trace_tz_mpc_iommu_notify(addr);
         event.entry.iova = addr;
         event.entry.translated_addr = addr;

         event.type = IOMMU_NOTIFIER_UNMAP;
         event.entry.perm = IOMMU_NONE;
         memory_region_notify_iommu(&s->upstream, IOMMU_IDX_S, event);
         memory_region_notify_iommu(&s->upstream, IOMMU_IDX_NS, event);

         event.type = IOMMU_NOTIFIER_MAP;
         event.entry.perm = IOMMU_RW;
         if (block_is_ns) {
             event.entry.target_as = &s->blocked_io_as;
         } else {
             event.entry.target_as = &s->downstream_as;
         }
         memory_region_notify_iommu(&s->upstream, IOMMU_IDX_S, event);
         if (block_is_ns) {
             event.entry.target_as = &s->downstream_as;
         } else {
             event.entry.target_as = &s->blocked_io_as;
         }
         memory_region_notify_iommu(&s->upstream, IOMMU_IDX_NS, event);
     }
 }

 static void tz_mpc_autoinc_idx(TZMPC *s, unsigned access_size)
 {
     /* Auto-increment BLK_IDX if necessary */
     if (access_size == 4 && (s->ctrl & R_CTRL_AUTOINC_MASK)) {
         s->blk_idx++;
         s->blk_idx %= s->blk_max;
     }
 }

 static MemTxResult tz_mpc_reg_read(void *opaque, hwaddr addr,
                                    uint64_t *pdata,
                                    unsigned size, MemTxAttrs attrs)
 {
     TZMPC *s = TZ_MPC(opaque);
     uint64_t r;
     uint32_t offset = addr & ~0x3;

     if (!attrs.secure && offset < A_PIDR4) {
         /* NS accesses can only see the ID registers */
         qemu_log_mask(LOG_GUEST_ERROR,
                       "TZ MPC register read: NS access to offset 0x%x\n",
                       offset);
         r = 0;
         goto read_out;
     }

     switch (offset) {
     case A_CTRL:
         r = s->ctrl;
         break;
     case A_BLK_MAX:
         r = s->blk_max - 1;
         break;
     case A_BLK_CFG:
         /* We are never in "init in progress state", so this just indicates
          * the block size. s->blocksize == (1 << BLK_CFG + 5), so
          * BLK_CFG == ctz32(s->blocksize) - 5
          */
         r = ctz32(s->blocksize) - 5;
         break;
     case A_BLK_IDX:
         r = s->blk_idx;
         break;
     case A_BLK_LUT:
         r = s->blk_lut[s->blk_idx];
         tz_mpc_autoinc_idx(s, size);
         break;
     case A_INT_STAT:
         r = s->int_stat;
         break;
     case A_INT_EN:
         r = s->int_en;
         break;
     case A_INT_INFO1:
         r = s->int_info1;
         break;
     case A_INT_INFO2:
         r = s->int_info2;
         break;
     case A_PIDR4:
     case A_PIDR5:
     case A_PIDR6:
     case A_PIDR7:
     case A_PIDR0:
     case A_PIDR1:
     case A_PIDR2:
     case A_PIDR3:
     case A_CIDR0:
     case A_CIDR1:
     case A_CIDR2:
     case A_CIDR3:
         r = tz_mpc_idregs[(offset - A_PIDR4) / 4];
         break;
     case A_INT_CLEAR:
     case A_INT_SET:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "TZ MPC register read: write-only offset 0x%x\n",
                       offset);
         r = 0;
         break;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "TZ MPC register read: bad offset 0x%x\n", offset);
         r = 0;
         break;
     }

     if (size != 4) {
         /* None of our registers are read-sensitive (except BLK_LUT,
          * which can special case the "size not 4" case), so just
          * pull the right bytes out of the word read result.
          */
         r = extract32(r, (addr & 3) * 8, size * 8);
     }

 read_out:
     trace_tz_mpc_reg_read(addr, r, size);
     *pdata = r;
     return MEMTX_OK;
 }

 static MemTxResult tz_mpc_reg_write(void *opaque, hwaddr addr,
                                     uint64_t value,
                                     unsigned size, MemTxAttrs attrs)
 {
     TZMPC *s = TZ_MPC(opaque);
     uint32_t offset = addr & ~0x3;

     trace_tz_mpc_reg_write(addr, value, size);

     if (!attrs.secure && offset < A_PIDR4) {
         /* NS accesses can only see the ID registers */
         qemu_log_mask(LOG_GUEST_ERROR,
                       "TZ MPC register write: NS access to offset 0x%x\n",
                       offset);
         return MEMTX_OK;
     }

     if (size != 4) {
         /* Expand the byte or halfword write to a full word size.
          * In most cases we can do this with zeroes; the exceptions
          * are CTRL, BLK_IDX and BLK_LUT.
          */
         uint32_t oldval;

         switch (offset) {
         case A_CTRL:
             oldval = s->ctrl;
             break;
         case A_BLK_IDX:
             oldval = s->blk_idx;
             break;
         case A_BLK_LUT:
             oldval = s->blk_lut[s->blk_idx];
             break;
         default:
             oldval = 0;
             break;
         }
         value = deposit32(oldval, (addr & 3) * 8, size * 8, value);
     }

     if ((s->ctrl & R_CTRL_LOCKDOWN_MASK) &&
         (offset == A_CTRL || offset == A_BLK_LUT || offset == A_INT_EN)) {
         /* Lockdown mode makes these three registers read-only, and
          * the only way out of it is to reset the device.
          */
         qemu_log_mask(LOG_GUEST_ERROR, "TZ MPC register write to offset 0x%x "
                       "while MPC is in lockdown mode\n", offset);
         return MEMTX_OK;
     }

     switch (offset) {
     case A_CTRL:
         /* We don't implement the 'data gating' feature so all other bits
          * are reserved and we make them RAZ/WI.
          */
         s->ctrl = value & (R_CTRL_SEC_RESP_MASK |
                            R_CTRL_AUTOINC_MASK |
                            R_CTRL_LOCKDOWN_MASK);
         break;
     case A_BLK_IDX:
         s->blk_idx = value % s->blk_max;
         break;
     case A_BLK_LUT:
         tz_mpc_iommu_notify(s, s->blk_idx, s->blk_lut[s->blk_idx], value);
         s->blk_lut[s->blk_idx] = value;
         tz_mpc_autoinc_idx(s, size);
         break;
     case A_INT_CLEAR:
         if (value & R_INT_CLEAR_IRQ_MASK) {
             s->int_stat = 0;
             tz_mpc_irq_update(s);
         }
         break;
     case A_INT_EN:
         s->int_en = value & R_INT_EN_IRQ_MASK;
         tz_mpc_irq_update(s);
         break;
     case A_INT_SET:
         if (value & R_INT_SET_IRQ_MASK) {
             s->int_stat = R_INT_STAT_IRQ_MASK;
             tz_mpc_irq_update(s);
         }
         break;
     case A_PIDR4:
     case A_PIDR5:
     case A_PIDR6:
     case A_PIDR7:
     case A_PIDR0:
     case A_PIDR1:
     case A_PIDR2:
     case A_PIDR3:
     case A_CIDR0:
     case A_CIDR1:
     case A_CIDR2:
     case A_CIDR3:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "TZ MPC register write: read-only offset 0x%x\n", offset);
         break;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "TZ MPC register write: bad offset 0x%x\n", offset);
         break;
     }

     return MEMTX_OK;
 }

 static const MemoryRegionOps tz_mpc_reg_ops = {
     .read_with_attrs = tz_mpc_reg_read,
     .write_with_attrs = tz_mpc_reg_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
     .valid.min_access_size = 1,
     .valid.max_access_size = 4,
     .impl.min_access_size = 1,
     .impl.max_access_size = 4,
 };

 static inline bool tz_mpc_cfg_ns(TZMPC *s, hwaddr addr)
 {
     /* Return the cfg_ns bit from the LUT for the specified address */
     hwaddr blknum = addr / s->blocksize;
     hwaddr blkword = blknum / 32;
     uint32_t blkbit = 1U << (blknum % 32);

     /* This would imply the address was larger than the size we
      * defined this memory region to be, so it can't happen.
      */
     assert(blkword < s->blk_max);
     return s->blk_lut[blkword] & blkbit;
 }

 static MemTxResult tz_mpc_handle_block(TZMPC *s, hwaddr addr, MemTxAttrs attrs)
 {
     /* Handle a blocked transaction: raise IRQ, capture info, etc */
     if (!s->int_stat) {
         /* First blocked transfer: capture information into INT_INFO1 and
          * INT_INFO2. Subsequent transfers are still blocked but don't
          * capture information until the guest clears the interrupt.
          */

         s->int_info1 = addr;
         s->int_info2 = 0;
         s->int_info2 = FIELD_DP32(s->int_info2, INT_INFO2, HMASTER,
                                   attrs.requester_id & 0xffff);
         s->int_info2 = FIELD_DP32(s->int_info2, INT_INFO2, HNONSEC,
                                   ~attrs.secure);
         s->int_info2 = FIELD_DP32(s->int_info2, INT_INFO2, CFG_NS,
                                   tz_mpc_cfg_ns(s, addr));
         s->int_stat |= R_INT_STAT_IRQ_MASK;
         tz_mpc_irq_update(s);
     }

     /* Generate bus error if desired; otherwise RAZ/WI */
     return (s->ctrl & R_CTRL_SEC_RESP_MASK) ? MEMTX_ERROR : MEMTX_OK;
 }

 /* Accesses only reach these read and write functions if the MPC is
  * blocking them; non-blocked accesses go directly to the downstream
  * memory region without passing through this code.
  */
 static MemTxResult tz_mpc_mem_blocked_read(void *opaque, hwaddr addr,
                                            uint64_t *pdata,
                                            unsigned size, MemTxAttrs attrs)
 {
     TZMPC *s = TZ_MPC(opaque);

     trace_tz_mpc_mem_blocked_read(addr, size, attrs.secure);

     *pdata = 0;
     return tz_mpc_handle_block(s, addr, attrs);
 }

 static MemTxResult tz_mpc_mem_blocked_write(void *opaque, hwaddr addr,
                                             uint64_t value,
                                             unsigned size, MemTxAttrs attrs)
 {
     TZMPC *s = TZ_MPC(opaque);

     trace_tz_mpc_mem_blocked_write(addr, value, size, attrs.secure);

     return tz_mpc_handle_block(s, addr, attrs);
 }

 static const MemoryRegionOps tz_mpc_mem_blocked_ops = {
     .read_with_attrs = tz_mpc_mem_blocked_read,
     .write_with_attrs = tz_mpc_mem_blocked_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
     .valid.min_access_size = 1,
     .valid.max_access_size = 8,
     .impl.min_access_size = 1,
     .impl.max_access_size = 8,
 };

 static IOMMUTLBEntry tz_mpc_translate(IOMMUMemoryRegion *iommu,
                                       hwaddr addr, IOMMUAccessFlags flags,
                                       int iommu_idx)
 {
     TZMPC *s = TZ_MPC(container_of(iommu, TZMPC, upstream));
     bool ok;

     IOMMUTLBEntry ret = {
         .iova = addr & ~(s->blocksize - 1),
         .translated_addr = addr & ~(s->blocksize - 1),
         .addr_mask = s->blocksize - 1,
         .perm = IOMMU_RW,
     };

     /* Look at the per-block configuration for this address, and
      * return a TLB entry directing the transaction at either
      * downstream_as or blocked_io_as, as appropriate.
      * If the LUT cfg_ns bit is 1, only non-secure transactions
      * may pass. If the bit is 0, only secure transactions may pass.
      */
     ok = tz_mpc_cfg_ns(s, addr) == (iommu_idx == IOMMU_IDX_NS);

     trace_tz_mpc_translate(addr, flags,
                            iommu_idx == IOMMU_IDX_S ? "S" : "NS",
                            ok ? "pass" : "block");

     ret.target_as = ok ? &s->downstream_as : &s->blocked_io_as;
     return ret;
 }

 static int tz_mpc_attrs_to_index(IOMMUMemoryRegion *iommu, MemTxAttrs attrs)
 {
     /* We treat unspecified attributes like secure. Transactions with
      * unspecified attributes come from places like
      * rom_reset() for initial image load, and we want
      * those to pass through the from-reset "everything is secure" config.
      * All the real during-emulation transactions from the CPU will
      * specify attributes.
      */
     return (attrs.unspecified || attrs.secure) ? IOMMU_IDX_S : IOMMU_IDX_NS;
 }

 static int tz_mpc_num_indexes(IOMMUMemoryRegion *iommu)
 {
     return IOMMU_NUM_INDEXES;
 }

 static void tz_mpc_reset(DeviceState *dev)
 {
     TZMPC *s = TZ_MPC(dev);

     s->ctrl = 0x00000100;
     s->blk_idx = 0;
     s->int_stat = 0;
     s->int_en = 1;
     s->int_info1 = 0;
     s->int_info2 = 0;

     memset(s->blk_lut, 0, s->blk_max * sizeof(uint32_t));
 }

 static void tz_mpc_init(Object *obj)
 {
     DeviceState *dev = DEVICE(obj);
     TZMPC *s = TZ_MPC(obj);

     qdev_init_gpio_out_named(dev, &s->irq, "irq", 1);
 }

 static void tz_mpc_realize(DeviceState *dev, Error **errp)
 {
     Object *obj = OBJECT(dev);
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
     TZMPC *s = TZ_MPC(dev);
     uint64_t size;

     /* We can't create the upstream end of the port until realize,
      * as we don't know the size of the MR used as the downstream until then.
      * We insist on having a downstream, to avoid complicating the code
      * with handling the "don't know how big this is" case. It's easy
      * enough for the user to create an unimplemented_device as downstream
      * if they have nothing else to plug into this.
      */
     if (!s->downstream) {
         error_setg(errp, "MPC 'downstream' link not set");
         return;
     }

     size = memory_region_size(s->downstream);

     memory_region_init_iommu(&s->upstream, sizeof(s->upstream),
                              TYPE_TZ_MPC_IOMMU_MEMORY_REGION,
                              obj, "tz-mpc-upstream", size);

     /* In real hardware the block size is configurable. In QEMU we could
      * make it configurable but will need it to be at least as big as the
      * target page size so we can execute out of the resulting MRs. Guest
      * software is supposed to check the block size using the BLK_CFG
      * register, so make it fixed at the page size.
      */
     s->blocksize = memory_region_iommu_get_min_page_size(&s->upstream);
     if (size % s->blocksize != 0) {
         error_setg(errp,
                    "MPC 'downstream' size %" PRId64
                    " is not a multiple of %" HWADDR_PRIx " bytes",
                    size, s->blocksize);
         object_unref(OBJECT(&s->upstream));
         return;
     }

     /* BLK_MAX is the max value of BLK_IDX, which indexes an array of 32-bit
      * words, each bit of which indicates one block.
      */
     s->blk_max = DIV_ROUND_UP(size / s->blocksize, 32);

     memory_region_init_io(&s->regmr, obj, &tz_mpc_reg_ops,
                           s, "tz-mpc-regs", 0x1000);
     sysbus_init_mmio(sbd, &s->regmr);

     sysbus_init_mmio(sbd, MEMORY_REGION(&s->upstream));

     /* This memory region is not exposed to users of this device as a
      * sysbus MMIO region, but is instead used internally as something
      * that our IOMMU translate function might direct accesses to.
      */
     memory_region_init_io(&s->blocked_io, obj, &tz_mpc_mem_blocked_ops,
                           s, "tz-mpc-blocked-io", size);

     address_space_init(&s->downstream_as, s->downstream,
                        "tz-mpc-downstream");
     address_space_init(&s->blocked_io_as, &s->blocked_io,
                        "tz-mpc-blocked-io");

     s->blk_lut = g_new0(uint32_t, s->blk_max);
 }

 static int tz_mpc_post_load(void *opaque, int version_id)
 {
     TZMPC *s = TZ_MPC(opaque);

     /* Check the incoming data doesn't point blk_idx off the end of blk_lut. */
     if (s->blk_idx >= s->blk_max) {
         return -1;
     }
     return 0;
 }

 static const VMStateDescription tz_mpc_vmstate = {
     .name = "tz-mpc",
     .version_id = 1,
     .minimum_version_id = 1,
     .post_load = tz_mpc_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(ctrl, TZMPC),
         VMSTATE_UINT32(blk_idx, TZMPC),
         VMSTATE_UINT32(int_stat, TZMPC),
         VMSTATE_UINT32(int_en, TZMPC),
         VMSTATE_UINT32(int_info1, TZMPC),
         VMSTATE_UINT32(int_info2, TZMPC),
         VMSTATE_VARRAY_UINT32(blk_lut, TZMPC, blk_max,
                               0, vmstate_info_uint32, uint32_t),
         VMSTATE_END_OF_LIST()
     }
 };

 static Property tz_mpc_properties[] = {
     DEFINE_PROP_LINK("downstream", TZMPC, downstream,
                      TYPE_MEMORY_REGION, MemoryRegion *),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void tz_mpc_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     dc->realize = tz_mpc_realize;
     dc->vmsd = &tz_mpc_vmstate;
     dc->reset = tz_mpc_reset;
     device_class_set_props(dc, tz_mpc_properties);
 }

 static const TypeInfo tz_mpc_info = {
     .name = TYPE_TZ_MPC,
     .parent = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(TZMPC),
     .instance_init = tz_mpc_init,
     .class_init = tz_mpc_class_init,
 };

 static void tz_mpc_iommu_memory_region_class_init(ObjectClass *klass,
                                                   void *data)
 {
     IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_CLASS(klass);

     imrc->translate = tz_mpc_translate;
     imrc->attrs_to_index = tz_mpc_attrs_to_index;
     imrc->num_indexes = tz_mpc_num_indexes;
 }

 static const TypeInfo tz_mpc_iommu_memory_region_info = {
     .name = TYPE_TZ_MPC_IOMMU_MEMORY_REGION,
     .parent = TYPE_IOMMU_MEMORY_REGION,
     .class_init = tz_mpc_iommu_memory_region_class_init,
 };

 static void tz_mpc_register_types(void)
 {
     type_register_static(&tz_mpc_info);
     type_register_static(&tz_mpc_iommu_memory_region_info);
 }

 type_init(tz_mpc_register_types);
	/*
	* ARM AHB5 TrustZone Memory Protection Controller emulation
	*
	* Copyright (c) 2018 Linaro Limited
	* Written by Peter Maydell
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 or
	* (at your option) any later version.
	*/

	#include "qemu/osdep.h"
	#include "qemu/log.h"
	#include "qemu/module.h"
	#include "qapi/error.h"
	#include "trace.h"
	#include "hw/sysbus.h"
	#include "migration/vmstate.h"
	#include "hw/registerfields.h"
	#include "hw/irq.h"
	#include "hw/misc/tz-mpc.h"
	#include "hw/qdev-properties.h"

	/* Our IOMMU has two IOMMU indexes, one for secure transactions and one for
	* non-secure transactions.
	*/
	enum {
	IOMMU_IDX_S,
	IOMMU_IDX_NS,
	IOMMU_NUM_INDEXES,
	};

	/* Config registers */
	REG32(CTRL, 0x00)
	FIELD(CTRL, SEC_RESP, 4, 1)
	FIELD(CTRL, AUTOINC, 8, 1)
	FIELD(CTRL, LOCKDOWN, 31, 1)
	REG32(BLK_MAX, 0x10)
	REG32(BLK_CFG, 0x14)
	REG32(BLK_IDX, 0x18)
	REG32(BLK_LUT, 0x1c)
	REG32(INT_STAT, 0x20)
	FIELD(INT_STAT, IRQ, 0, 1)
	REG32(INT_CLEAR, 0x24)
	FIELD(INT_CLEAR, IRQ, 0, 1)
	REG32(INT_EN, 0x28)
	FIELD(INT_EN, IRQ, 0, 1)
	REG32(INT_INFO1, 0x2c)
	REG32(INT_INFO2, 0x30)
	FIELD(INT_INFO2, HMASTER, 0, 16)
	FIELD(INT_INFO2, HNONSEC, 16, 1)
	FIELD(INT_INFO2, CFG_NS, 17, 1)
	REG32(INT_SET, 0x34)
	FIELD(INT_SET, IRQ, 0, 1)
	REG32(PIDR4, 0xfd0)
	REG32(PIDR5, 0xfd4)
	REG32(PIDR6, 0xfd8)
	REG32(PIDR7, 0xfdc)
	REG32(PIDR0, 0xfe0)
	REG32(PIDR1, 0xfe4)
	REG32(PIDR2, 0xfe8)
	REG32(PIDR3, 0xfec)
	REG32(CIDR0, 0xff0)
	REG32(CIDR1, 0xff4)
	REG32(CIDR2, 0xff8)
	REG32(CIDR3, 0xffc)

	static const uint8_t tz_mpc_idregs[] = {
	0x04, 0x00, 0x00, 0x00,
	0x60, 0xb8, 0x1b, 0x00,
	0x0d, 0xf0, 0x05, 0xb1,
	};

	static void tz_mpc_irq_update(TZMPC *s)
	{
	qemu_set_irq(s->irq, s->int_stat && s->int_en);
	}

	static void tz_mpc_iommu_notify(TZMPC *s, uint32_t lutidx,
	uint32_t oldlut, uint32_t newlut)
	{
	/* Called when the LUT word at lutidx has changed from oldlut to newlut;
	* must call the IOMMU notifiers for the changed blocks.
	*/
	IOMMUTLBEvent event = {
	.entry = {
	.addr_mask = s->blocksize - 1,
	}
	};
	hwaddr addr = lutidx * s->blocksize * 32;
	int i;

	for (i = 0; i < 32; i++, addr += s->blocksize) {
	bool block_is_ns;

	if (!((oldlut ^ newlut) & (1 << i))) {
	continue;
	}
	/* This changes the mappings for both the S and the NS space,
	* so we need to do four notifies: an UNMAP then a MAP for each.
	*/
	block_is_ns = newlut & (1 << i);

	trace_tz_mpc_iommu_notify(addr);
	event.entry.iova = addr;
	event.entry.translated_addr = addr;

	event.type = IOMMU_NOTIFIER_UNMAP;
	event.entry.perm = IOMMU_NONE;
	memory_region_notify_iommu(&s->upstream, IOMMU_IDX_S, event);
	memory_region_notify_iommu(&s->upstream, IOMMU_IDX_NS, event);

	event.type = IOMMU_NOTIFIER_MAP;
	event.entry.perm = IOMMU_RW;
	if (block_is_ns) {
	event.entry.target_as = &s->blocked_io_as;
	} else {
	event.entry.target_as = &s->downstream_as;
	}
	memory_region_notify_iommu(&s->upstream, IOMMU_IDX_S, event);
	if (block_is_ns) {
	event.entry.target_as = &s->downstream_as;
	} else {
	event.entry.target_as = &s->blocked_io_as;
	}
	memory_region_notify_iommu(&s->upstream, IOMMU_IDX_NS, event);
	}
	}

	static void tz_mpc_autoinc_idx(TZMPC *s, unsigned access_size)
	{
	/* Auto-increment BLK_IDX if necessary */
	if (access_size == 4 && (s->ctrl & R_CTRL_AUTOINC_MASK)) {
	s->blk_idx++;
	s->blk_idx %= s->blk_max;
	}
	}

	static MemTxResult tz_mpc_reg_read(void *opaque, hwaddr addr,
	uint64_t *pdata,
	unsigned size, MemTxAttrs attrs)
	{
	TZMPC *s = TZ_MPC(opaque);
	uint64_t r;
	uint32_t offset = addr & ~0x3;

	if (!attrs.secure && offset < A_PIDR4) {
	/* NS accesses can only see the ID registers */
	qemu_log_mask(LOG_GUEST_ERROR,
	"TZ MPC register read: NS access to offset 0x%x\n",
	offset);
	r = 0;
	goto read_out;
	}

	switch (offset) {
	case A_CTRL:
	r = s->ctrl;
	break;
	case A_BLK_MAX:
	r = s->blk_max - 1;
	break;
	case A_BLK_CFG:
	/* We are never in "init in progress state", so this just indicates
	* the block size. s->blocksize == (1 << BLK_CFG + 5), so
	* BLK_CFG == ctz32(s->blocksize) - 5
	*/
	r = ctz32(s->blocksize) - 5;
	break;
	case A_BLK_IDX:
	r = s->blk_idx;
	break;
	case A_BLK_LUT:
	r = s->blk_lut[s->blk_idx];
	tz_mpc_autoinc_idx(s, size);
	break;
	case A_INT_STAT:
	r = s->int_stat;
	break;
	case A_INT_EN:
	r = s->int_en;
	break;
	case A_INT_INFO1:
	r = s->int_info1;
	break;
	case A_INT_INFO2:
	r = s->int_info2;
	break;
	case A_PIDR4:
	case A_PIDR5:
	case A_PIDR6:
	case A_PIDR7:
	case A_PIDR0:
	case A_PIDR1:
	case A_PIDR2:
	case A_PIDR3:
	case A_CIDR0:
	case A_CIDR1:
	case A_CIDR2:
	case A_CIDR3:
	r = tz_mpc_idregs[(offset - A_PIDR4) / 4];
	break;
	case A_INT_CLEAR:
	case A_INT_SET:
	qemu_log_mask(LOG_GUEST_ERROR,
	"TZ MPC register read: write-only offset 0x%x\n",
	offset);
	r = 0;
	break;
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"TZ MPC register read: bad offset 0x%x\n", offset);
	r = 0;
	break;
	}

	if (size != 4) {
	/* None of our registers are read-sensitive (except BLK_LUT,
	* which can special case the "size not 4" case), so just
	* pull the right bytes out of the word read result.
	*/
	r = extract32(r, (addr & 3) * 8, size * 8);
	}

	read_out:
	trace_tz_mpc_reg_read(addr, r, size);
	*pdata = r;
	return MEMTX_OK;
	}

	static MemTxResult tz_mpc_reg_write(void *opaque, hwaddr addr,
	uint64_t value,
	unsigned size, MemTxAttrs attrs)
	{
	TZMPC *s = TZ_MPC(opaque);
	uint32_t offset = addr & ~0x3;

	trace_tz_mpc_reg_write(addr, value, size);

	if (!attrs.secure && offset < A_PIDR4) {
	/* NS accesses can only see the ID registers */
	qemu_log_mask(LOG_GUEST_ERROR,
	"TZ MPC register write: NS access to offset 0x%x\n",
	offset);
	return MEMTX_OK;
	}

	if (size != 4) {
	/* Expand the byte or halfword write to a full word size.
	* In most cases we can do this with zeroes; the exceptions
	* are CTRL, BLK_IDX and BLK_LUT.
	*/
	uint32_t oldval;

	switch (offset) {
	case A_CTRL:
	oldval = s->ctrl;
	break;
	case A_BLK_IDX:
	oldval = s->blk_idx;
	break;
	case A_BLK_LUT:
	oldval = s->blk_lut[s->blk_idx];
	break;
	default:
	oldval = 0;
	break;
	}
	value = deposit32(oldval, (addr & 3) * 8, size * 8, value);
	}

	if ((s->ctrl & R_CTRL_LOCKDOWN_MASK) &&
	(offset == A_CTRL \|\| offset == A_BLK_LUT \|\| offset == A_INT_EN)) {
	/* Lockdown mode makes these three registers read-only, and
	* the only way out of it is to reset the device.
	*/
	qemu_log_mask(LOG_GUEST_ERROR, "TZ MPC register write to offset 0x%x "
	"while MPC is in lockdown mode\n", offset);
	return MEMTX_OK;
	}

	switch (offset) {
	case A_CTRL:
	/* We don't implement the 'data gating' feature so all other bits
	* are reserved and we make them RAZ/WI.
	*/
	s->ctrl = value & (R_CTRL_SEC_RESP_MASK \|
	R_CTRL_AUTOINC_MASK \|
	R_CTRL_LOCKDOWN_MASK);
	break;
	case A_BLK_IDX:
	s->blk_idx = value % s->blk_max;
	break;
	case A_BLK_LUT:
	tz_mpc_iommu_notify(s, s->blk_idx, s->blk_lut[s->blk_idx], value);
	s->blk_lut[s->blk_idx] = value;
	tz_mpc_autoinc_idx(s, size);
	break;
	case A_INT_CLEAR:
	if (value & R_INT_CLEAR_IRQ_MASK) {
	s->int_stat = 0;
	tz_mpc_irq_update(s);
	}
	break;
	case A_INT_EN:
	s->int_en = value & R_INT_EN_IRQ_MASK;
	tz_mpc_irq_update(s);
	break;
	case A_INT_SET:
	if (value & R_INT_SET_IRQ_MASK) {
	s->int_stat = R_INT_STAT_IRQ_MASK;
	tz_mpc_irq_update(s);
	}
	break;
	case A_PIDR4:
	case A_PIDR5:
	case A_PIDR6:
	case A_PIDR7:
	case A_PIDR0:
	case A_PIDR1:
	case A_PIDR2:
	case A_PIDR3:
	case A_CIDR0:
	case A_CIDR1:
	case A_CIDR2:
	case A_CIDR3:
	qemu_log_mask(LOG_GUEST_ERROR,
	"TZ MPC register write: read-only offset 0x%x\n", offset);
	break;
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"TZ MPC register write: bad offset 0x%x\n", offset);
	break;
	}

	return MEMTX_OK;
	}

	static const MemoryRegionOps tz_mpc_reg_ops = {
	.read_with_attrs = tz_mpc_reg_read,
	.write_with_attrs = tz_mpc_reg_write,
	.endianness = DEVICE_LITTLE_ENDIAN,
	.valid.min_access_size = 1,
	.valid.max_access_size = 4,
	.impl.min_access_size = 1,
	.impl.max_access_size = 4,
	};

	static inline bool tz_mpc_cfg_ns(TZMPC *s, hwaddr addr)
	{
	/* Return the cfg_ns bit from the LUT for the specified address */
	hwaddr blknum = addr / s->blocksize;
	hwaddr blkword = blknum / 32;
	uint32_t blkbit = 1U << (blknum % 32);

	/* This would imply the address was larger than the size we
	* defined this memory region to be, so it can't happen.
	*/
	assert(blkword < s->blk_max);
	return s->blk_lut[blkword] & blkbit;
	}

	static MemTxResult tz_mpc_handle_block(TZMPC *s, hwaddr addr, MemTxAttrs attrs)
	{
	/* Handle a blocked transaction: raise IRQ, capture info, etc */
	if (!s->int_stat) {
	/* First blocked transfer: capture information into INT_INFO1 and
	* INT_INFO2. Subsequent transfers are still blocked but don't
	* capture information until the guest clears the interrupt.
	*/

	s->int_info1 = addr;
	s->int_info2 = 0;
	s->int_info2 = FIELD_DP32(s->int_info2, INT_INFO2, HMASTER,
	attrs.requester_id & 0xffff);
	s->int_info2 = FIELD_DP32(s->int_info2, INT_INFO2, HNONSEC,
	~attrs.secure);
	s->int_info2 = FIELD_DP32(s->int_info2, INT_INFO2, CFG_NS,
	tz_mpc_cfg_ns(s, addr));
	s->int_stat \|= R_INT_STAT_IRQ_MASK;
	tz_mpc_irq_update(s);
	}

	/* Generate bus error if desired; otherwise RAZ/WI */
	return (s->ctrl & R_CTRL_SEC_RESP_MASK) ? MEMTX_ERROR : MEMTX_OK;
	}

	/* Accesses only reach these read and write functions if the MPC is
	* blocking them; non-blocked accesses go directly to the downstream
	* memory region without passing through this code.
	*/
	static MemTxResult tz_mpc_mem_blocked_read(void *opaque, hwaddr addr,
	uint64_t *pdata,
	unsigned size, MemTxAttrs attrs)
	{
	TZMPC *s = TZ_MPC(opaque);

	trace_tz_mpc_mem_blocked_read(addr, size, attrs.secure);

	*pdata = 0;
	return tz_mpc_handle_block(s, addr, attrs);
	}

	static MemTxResult tz_mpc_mem_blocked_write(void *opaque, hwaddr addr,
	uint64_t value,
	unsigned size, MemTxAttrs attrs)
	{
	TZMPC *s = TZ_MPC(opaque);

	trace_tz_mpc_mem_blocked_write(addr, value, size, attrs.secure);

	return tz_mpc_handle_block(s, addr, attrs);
	}

	static const MemoryRegionOps tz_mpc_mem_blocked_ops = {
	.read_with_attrs = tz_mpc_mem_blocked_read,
	.write_with_attrs = tz_mpc_mem_blocked_write,
	.endianness = DEVICE_LITTLE_ENDIAN,
	.valid.min_access_size = 1,
	.valid.max_access_size = 8,
	.impl.min_access_size = 1,
	.impl.max_access_size = 8,
	};

	static IOMMUTLBEntry tz_mpc_translate(IOMMUMemoryRegion *iommu,
	hwaddr addr, IOMMUAccessFlags flags,
	int iommu_idx)
	{
	TZMPC *s = TZ_MPC(container_of(iommu, TZMPC, upstream));
	bool ok;

	IOMMUTLBEntry ret = {
	.iova = addr & ~(s->blocksize - 1),
	.translated_addr = addr & ~(s->blocksize - 1),
	.addr_mask = s->blocksize - 1,
	.perm = IOMMU_RW,
	};

	/* Look at the per-block configuration for this address, and
	* return a TLB entry directing the transaction at either
	* downstream_as or blocked_io_as, as appropriate.
	* If the LUT cfg_ns bit is 1, only non-secure transactions
	* may pass. If the bit is 0, only secure transactions may pass.
	*/
	ok = tz_mpc_cfg_ns(s, addr) == (iommu_idx == IOMMU_IDX_NS);

	trace_tz_mpc_translate(addr, flags,
	iommu_idx == IOMMU_IDX_S ? "S" : "NS",
	ok ? "pass" : "block");

	ret.target_as = ok ? &s->downstream_as : &s->blocked_io_as;
	return ret;
	}

	static int tz_mpc_attrs_to_index(IOMMUMemoryRegion *iommu, MemTxAttrs attrs)
	{
	/* We treat unspecified attributes like secure. Transactions with
	* unspecified attributes come from places like
	* rom_reset() for initial image load, and we want
	* those to pass through the from-reset "everything is secure" config.
	* All the real during-emulation transactions from the CPU will
	* specify attributes.
	*/
	return (attrs.unspecified \|\| attrs.secure) ? IOMMU_IDX_S : IOMMU_IDX_NS;
	}

	static int tz_mpc_num_indexes(IOMMUMemoryRegion *iommu)
	{
	return IOMMU_NUM_INDEXES;
	}

	static void tz_mpc_reset(DeviceState *dev)
	{
	TZMPC *s = TZ_MPC(dev);

	s->ctrl = 0x00000100;
	s->blk_idx = 0;
	s->int_stat = 0;
	s->int_en = 1;
	s->int_info1 = 0;
	s->int_info2 = 0;

	memset(s->blk_lut, 0, s->blk_max * sizeof(uint32_t));
	}

	static void tz_mpc_init(Object *obj)
	{
	DeviceState *dev = DEVICE(obj);
	TZMPC *s = TZ_MPC(obj);

	qdev_init_gpio_out_named(dev, &s->irq, "irq", 1);
	}

	static void tz_mpc_realize(DeviceState dev, Error *errp)
	{
	Object *obj = OBJECT(dev);
	SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
	TZMPC *s = TZ_MPC(dev);
	uint64_t size;

	/* We can't create the upstream end of the port until realize,
	* as we don't know the size of the MR used as the downstream until then.
	* We insist on having a downstream, to avoid complicating the code
	* with handling the "don't know how big this is" case. It's easy
	* enough for the user to create an unimplemented_device as downstream
	* if they have nothing else to plug into this.
	*/
	if (!s->downstream) {
	error_setg(errp, "MPC 'downstream' link not set");
	return;
	}

	size = memory_region_size(s->downstream);

	memory_region_init_iommu(&s->upstream, sizeof(s->upstream),
	TYPE_TZ_MPC_IOMMU_MEMORY_REGION,
	obj, "tz-mpc-upstream", size);

	/* In real hardware the block size is configurable. In QEMU we could
	* make it configurable but will need it to be at least as big as the
	* target page size so we can execute out of the resulting MRs. Guest
	* software is supposed to check the block size using the BLK_CFG
	* register, so make it fixed at the page size.
	*/
	s->blocksize = memory_region_iommu_get_min_page_size(&s->upstream);
	if (size % s->blocksize != 0) {
	error_setg(errp,
	"MPC 'downstream' size %" PRId64
	" is not a multiple of %" HWADDR_PRIx " bytes",
	size, s->blocksize);
	object_unref(OBJECT(&s->upstream));
	return;
	}

	/* BLK_MAX is the max value of BLK_IDX, which indexes an array of 32-bit
	* words, each bit of which indicates one block.
	*/
	s->blk_max = DIV_ROUND_UP(size / s->blocksize, 32);

	memory_region_init_io(&s->regmr, obj, &tz_mpc_reg_ops,
	s, "tz-mpc-regs", 0x1000);
	sysbus_init_mmio(sbd, &s->regmr);

	sysbus_init_mmio(sbd, MEMORY_REGION(&s->upstream));

	/* This memory region is not exposed to users of this device as a
	* sysbus MMIO region, but is instead used internally as something
	* that our IOMMU translate function might direct accesses to.
	*/
	memory_region_init_io(&s->blocked_io, obj, &tz_mpc_mem_blocked_ops,
	s, "tz-mpc-blocked-io", size);

	address_space_init(&s->downstream_as, s->downstream,
	"tz-mpc-downstream");
	address_space_init(&s->blocked_io_as, &s->blocked_io,
	"tz-mpc-blocked-io");

	s->blk_lut = g_new0(uint32_t, s->blk_max);
	}

	static int tz_mpc_post_load(void *opaque, int version_id)
	{
	TZMPC *s = TZ_MPC(opaque);

	/* Check the incoming data doesn't point blk_idx off the end of blk_lut. */
	if (s->blk_idx >= s->blk_max) {
	return -1;
	}
	return 0;
	}

	static const VMStateDescription tz_mpc_vmstate = {
	.name = "tz-mpc",
	.version_id = 1,
	.minimum_version_id = 1,
	.post_load = tz_mpc_post_load,
	.fields = (VMStateField[]) {
	VMSTATE_UINT32(ctrl, TZMPC),
	VMSTATE_UINT32(blk_idx, TZMPC),
	VMSTATE_UINT32(int_stat, TZMPC),
	VMSTATE_UINT32(int_en, TZMPC),
	VMSTATE_UINT32(int_info1, TZMPC),
	VMSTATE_UINT32(int_info2, TZMPC),
	VMSTATE_VARRAY_UINT32(blk_lut, TZMPC, blk_max,
	0, vmstate_info_uint32, uint32_t),
	VMSTATE_END_OF_LIST()
	}
	};

	static Property tz_mpc_properties[] = {
	DEFINE_PROP_LINK("downstream", TZMPC, downstream,
	TYPE_MEMORY_REGION, MemoryRegion *),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void tz_mpc_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	dc->realize = tz_mpc_realize;
	dc->vmsd = &tz_mpc_vmstate;
	dc->reset = tz_mpc_reset;
	device_class_set_props(dc, tz_mpc_properties);
	}

	static const TypeInfo tz_mpc_info = {
	.name = TYPE_TZ_MPC,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(TZMPC),
	.instance_init = tz_mpc_init,
	.class_init = tz_mpc_class_init,
	};

	static void tz_mpc_iommu_memory_region_class_init(ObjectClass *klass,
	void *data)
	{
	IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_CLASS(klass);

	imrc->translate = tz_mpc_translate;
	imrc->attrs_to_index = tz_mpc_attrs_to_index;
	imrc->num_indexes = tz_mpc_num_indexes;
	}

	static const TypeInfo tz_mpc_iommu_memory_region_info = {
	.name = TYPE_TZ_MPC_IOMMU_MEMORY_REGION,
	.parent = TYPE_IOMMU_MEMORY_REGION,
	.class_init = tz_mpc_iommu_memory_region_class_init,
	};

	static void tz_mpc_register_types(void)
	{
	type_register_static(&tz_mpc_info);
	type_register_static(&tz_mpc_iommu_memory_region_info);
	}

	type_init(tz_mpc_register_types);