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sun4m_iommu.c
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sun4m_iommu.c
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/*
* QEMU Sun4m iommu 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 "sun4m.h"
#include "sysbus.h"
#include "trace.h"
/*
* I/O MMU used by Sun4m systems
*
* Chipset docs:
* "Sun-4M System Architecture (revision 2.0) by Chuck Narad", 950-1373-01,
* http://mediacast.sun.com/users/Barton808/media/Sun4M_SystemArchitecture_edited2.pdf
*/
#define IOMMU_NREGS (4*4096/4)
#define IOMMU_CTRL (0x0000 >> 2)
#define IOMMU_CTRL_IMPL 0xf0000000 /* Implementation */
#define IOMMU_CTRL_VERS 0x0f000000 /* Version */
#define IOMMU_CTRL_RNGE 0x0000001c /* Mapping RANGE */
#define IOMMU_RNGE_16MB 0x00000000 /* 0xff000000 -> 0xffffffff */
#define IOMMU_RNGE_32MB 0x00000004 /* 0xfe000000 -> 0xffffffff */
#define IOMMU_RNGE_64MB 0x00000008 /* 0xfc000000 -> 0xffffffff */
#define IOMMU_RNGE_128MB 0x0000000c /* 0xf8000000 -> 0xffffffff */
#define IOMMU_RNGE_256MB 0x00000010 /* 0xf0000000 -> 0xffffffff */
#define IOMMU_RNGE_512MB 0x00000014 /* 0xe0000000 -> 0xffffffff */
#define IOMMU_RNGE_1GB 0x00000018 /* 0xc0000000 -> 0xffffffff */
#define IOMMU_RNGE_2GB 0x0000001c /* 0x80000000 -> 0xffffffff */
#define IOMMU_CTRL_ENAB 0x00000001 /* IOMMU Enable */
#define IOMMU_CTRL_MASK 0x0000001d
#define IOMMU_BASE (0x0004 >> 2)
#define IOMMU_BASE_MASK 0x07fffc00
#define IOMMU_TLBFLUSH (0x0014 >> 2)
#define IOMMU_TLBFLUSH_MASK 0xffffffff
#define IOMMU_PGFLUSH (0x0018 >> 2)
#define IOMMU_PGFLUSH_MASK 0xffffffff
#define IOMMU_AFSR (0x1000 >> 2)
#define IOMMU_AFSR_ERR 0x80000000 /* LE, TO, or BE asserted */
#define IOMMU_AFSR_LE 0x40000000 /* SBUS reports error after
transaction */
#define IOMMU_AFSR_TO 0x20000000 /* Write access took more than
12.8 us. */
#define IOMMU_AFSR_BE 0x10000000 /* Write access received error
acknowledge */
#define IOMMU_AFSR_SIZE 0x0e000000 /* Size of transaction causing error */
#define IOMMU_AFSR_S 0x01000000 /* Sparc was in supervisor mode */
#define IOMMU_AFSR_RESV 0x00800000 /* Reserved, forced to 0x8 by
hardware */
#define IOMMU_AFSR_ME 0x00080000 /* Multiple errors occurred */
#define IOMMU_AFSR_RD 0x00040000 /* A read operation was in progress */
#define IOMMU_AFSR_FAV 0x00020000 /* IOMMU afar has valid contents */
#define IOMMU_AFSR_MASK 0xff0fffff
#define IOMMU_AFAR (0x1004 >> 2)
#define IOMMU_AER (0x1008 >> 2) /* Arbiter Enable Register */
#define IOMMU_AER_EN_P0_ARB 0x00000001 /* MBus master 0x8 (Always 1) */
#define IOMMU_AER_EN_P1_ARB 0x00000002 /* MBus master 0x9 */
#define IOMMU_AER_EN_P2_ARB 0x00000004 /* MBus master 0xa */
#define IOMMU_AER_EN_P3_ARB 0x00000008 /* MBus master 0xb */
#define IOMMU_AER_EN_0 0x00010000 /* SBus slot 0 */
#define IOMMU_AER_EN_1 0x00020000 /* SBus slot 1 */
#define IOMMU_AER_EN_2 0x00040000 /* SBus slot 2 */
#define IOMMU_AER_EN_3 0x00080000 /* SBus slot 3 */
#define IOMMU_AER_EN_F 0x00100000 /* SBus on-board */
#define IOMMU_AER_SBW 0x80000000 /* S-to-M asynchronous writes */
#define IOMMU_AER_MASK 0x801f000f
#define IOMMU_SBCFG0 (0x1010 >> 2) /* SBUS configration per-slot */
#define IOMMU_SBCFG1 (0x1014 >> 2) /* SBUS configration per-slot */
#define IOMMU_SBCFG2 (0x1018 >> 2) /* SBUS configration per-slot */
#define IOMMU_SBCFG3 (0x101c >> 2) /* SBUS configration per-slot */
#define IOMMU_SBCFG_SAB30 0x00010000 /* Phys-address bit 30 when
bypass enabled */
#define IOMMU_SBCFG_BA16 0x00000004 /* Slave supports 16 byte bursts */
#define IOMMU_SBCFG_BA8 0x00000002 /* Slave supports 8 byte bursts */
#define IOMMU_SBCFG_BYPASS 0x00000001 /* Bypass IOMMU, treat all addresses
produced by this device as pure
physical. */
#define IOMMU_SBCFG_MASK 0x00010003
#define IOMMU_ARBEN (0x2000 >> 2) /* SBUS arbitration enable */
#define IOMMU_ARBEN_MASK 0x001f0000
#define IOMMU_MID 0x00000008
#define IOMMU_MASK_ID (0x3018 >> 2) /* Mask ID */
#define IOMMU_MASK_ID_MASK 0x00ffffff
#define IOMMU_MSII_MASK 0x26000000 /* microSPARC II mask number */
#define IOMMU_TS_MASK 0x23000000 /* turboSPARC mask number */
/* The format of an iopte in the page tables */
#define IOPTE_PAGE 0xffffff00 /* Physical page number (PA[35:12]) */
#define IOPTE_CACHE 0x00000080 /* Cached (in vme IOCACHE or
Viking/MXCC) */
#define IOPTE_WRITE 0x00000004 /* Writeable */
#define IOPTE_VALID 0x00000002 /* IOPTE is valid */
#define IOPTE_WAZ 0x00000001 /* Write as zeros */
#define IOMMU_PAGE_SHIFT 12
#define IOMMU_PAGE_SIZE (1 << IOMMU_PAGE_SHIFT)
#define IOMMU_PAGE_MASK ~(IOMMU_PAGE_SIZE - 1)
typedef struct IOMMUState {
SysBusDevice busdev;
uint32_t regs[IOMMU_NREGS];
target_phys_addr_t iostart;
uint32_t version;
qemu_irq irq;
} IOMMUState;
static uint32_t iommu_mem_readl(void *opaque, target_phys_addr_t addr)
{
IOMMUState *s = opaque;
target_phys_addr_t saddr;
uint32_t ret;
saddr = addr >> 2;
switch (saddr) {
default:
ret = s->regs[saddr];
break;
case IOMMU_AFAR:
case IOMMU_AFSR:
ret = s->regs[saddr];
qemu_irq_lower(s->irq);
break;
}
trace_sun4m_iommu_mem_readl(saddr, ret);
return ret;
}
static void iommu_mem_writel(void *opaque, target_phys_addr_t addr,
uint32_t val)
{
IOMMUState *s = opaque;
target_phys_addr_t saddr;
saddr = addr >> 2;
trace_sun4m_iommu_mem_writel(saddr, val);
switch (saddr) {
case IOMMU_CTRL:
switch (val & IOMMU_CTRL_RNGE) {
case IOMMU_RNGE_16MB:
s->iostart = 0xffffffffff000000ULL;
break;
case IOMMU_RNGE_32MB:
s->iostart = 0xfffffffffe000000ULL;
break;
case IOMMU_RNGE_64MB:
s->iostart = 0xfffffffffc000000ULL;
break;
case IOMMU_RNGE_128MB:
s->iostart = 0xfffffffff8000000ULL;
break;
case IOMMU_RNGE_256MB:
s->iostart = 0xfffffffff0000000ULL;
break;
case IOMMU_RNGE_512MB:
s->iostart = 0xffffffffe0000000ULL;
break;
case IOMMU_RNGE_1GB:
s->iostart = 0xffffffffc0000000ULL;
break;
default:
case IOMMU_RNGE_2GB:
s->iostart = 0xffffffff80000000ULL;
break;
}
trace_sun4m_iommu_mem_writel_ctrl(s->iostart);
s->regs[saddr] = ((val & IOMMU_CTRL_MASK) | s->version);
break;
case IOMMU_BASE:
s->regs[saddr] = val & IOMMU_BASE_MASK;
break;
case IOMMU_TLBFLUSH:
trace_sun4m_iommu_mem_writel_tlbflush(val);
s->regs[saddr] = val & IOMMU_TLBFLUSH_MASK;
break;
case IOMMU_PGFLUSH:
trace_sun4m_iommu_mem_writel_pgflush(val);
s->regs[saddr] = val & IOMMU_PGFLUSH_MASK;
break;
case IOMMU_AFAR:
s->regs[saddr] = val;
qemu_irq_lower(s->irq);
break;
case IOMMU_AER:
s->regs[saddr] = (val & IOMMU_AER_MASK) | IOMMU_AER_EN_P0_ARB;
break;
case IOMMU_AFSR:
s->regs[saddr] = (val & IOMMU_AFSR_MASK) | IOMMU_AFSR_RESV;
qemu_irq_lower(s->irq);
break;
case IOMMU_SBCFG0:
case IOMMU_SBCFG1:
case IOMMU_SBCFG2:
case IOMMU_SBCFG3:
s->regs[saddr] = val & IOMMU_SBCFG_MASK;
break;
case IOMMU_ARBEN:
// XXX implement SBus probing: fault when reading unmapped
// addresses, fault cause and address stored to MMU/IOMMU
s->regs[saddr] = (val & IOMMU_ARBEN_MASK) | IOMMU_MID;
break;
case IOMMU_MASK_ID:
s->regs[saddr] |= val & IOMMU_MASK_ID_MASK;
break;
default:
s->regs[saddr] = val;
break;
}
}
static CPUReadMemoryFunc * const iommu_mem_read[3] = {
NULL,
NULL,
iommu_mem_readl,
};
static CPUWriteMemoryFunc * const iommu_mem_write[3] = {
NULL,
NULL,
iommu_mem_writel,
};
static uint32_t iommu_page_get_flags(IOMMUState *s, target_phys_addr_t addr)
{
uint32_t ret;
target_phys_addr_t iopte;
target_phys_addr_t pa = addr;
iopte = s->regs[IOMMU_BASE] << 4;
addr &= ~s->iostart;
iopte += (addr >> (IOMMU_PAGE_SHIFT - 2)) & ~3;
cpu_physical_memory_read(iopte, (uint8_t *)&ret, 4);
tswap32s(&ret);
trace_sun4m_iommu_page_get_flags(pa, iopte, ret);
return ret;
}
static target_phys_addr_t iommu_translate_pa(target_phys_addr_t addr,
uint32_t pte)
{
target_phys_addr_t pa;
pa = ((pte & IOPTE_PAGE) << 4) + (addr & ~IOMMU_PAGE_MASK);
trace_sun4m_iommu_translate_pa(addr, pa, pte);
return pa;
}
static void iommu_bad_addr(IOMMUState *s, target_phys_addr_t addr,
int is_write)
{
trace_sun4m_iommu_bad_addr(addr);
s->regs[IOMMU_AFSR] = IOMMU_AFSR_ERR | IOMMU_AFSR_LE | IOMMU_AFSR_RESV |
IOMMU_AFSR_FAV;
if (!is_write)
s->regs[IOMMU_AFSR] |= IOMMU_AFSR_RD;
s->regs[IOMMU_AFAR] = addr;
qemu_irq_raise(s->irq);
}
void sparc_iommu_memory_rw(void *opaque, target_phys_addr_t addr,
uint8_t *buf, int len, int is_write)
{
int l;
uint32_t flags;
target_phys_addr_t page, phys_addr;
while (len > 0) {
page = addr & IOMMU_PAGE_MASK;
l = (page + IOMMU_PAGE_SIZE) - addr;
if (l > len)
l = len;
flags = iommu_page_get_flags(opaque, page);
if (!(flags & IOPTE_VALID)) {
iommu_bad_addr(opaque, page, is_write);
return;
}
phys_addr = iommu_translate_pa(addr, flags);
if (is_write) {
if (!(flags & IOPTE_WRITE)) {
iommu_bad_addr(opaque, page, is_write);
return;
}
cpu_physical_memory_write(phys_addr, buf, l);
} else {
cpu_physical_memory_read(phys_addr, buf, l);
}
len -= l;
buf += l;
addr += l;
}
}
static const VMStateDescription vmstate_iommu = {
.name ="iommu",
.version_id = 2,
.minimum_version_id = 2,
.minimum_version_id_old = 2,
.fields = (VMStateField []) {
VMSTATE_UINT32_ARRAY(regs, IOMMUState, IOMMU_NREGS),
VMSTATE_UINT64(iostart, IOMMUState),
VMSTATE_END_OF_LIST()
}
};
static void iommu_reset(DeviceState *d)
{
IOMMUState *s = container_of(d, IOMMUState, busdev.qdev);
memset(s->regs, 0, IOMMU_NREGS * 4);
s->iostart = 0;
s->regs[IOMMU_CTRL] = s->version;
s->regs[IOMMU_ARBEN] = IOMMU_MID;
s->regs[IOMMU_AFSR] = IOMMU_AFSR_RESV;
s->regs[IOMMU_AER] = IOMMU_AER_EN_P0_ARB | IOMMU_AER_EN_P1_ARB;
s->regs[IOMMU_MASK_ID] = IOMMU_TS_MASK;
}
static int iommu_init1(SysBusDevice *dev)
{
IOMMUState *s = FROM_SYSBUS(IOMMUState, dev);
int io;
sysbus_init_irq(dev, &s->irq);
io = cpu_register_io_memory(iommu_mem_read, iommu_mem_write, s,
DEVICE_NATIVE_ENDIAN);
sysbus_init_mmio(dev, IOMMU_NREGS * sizeof(uint32_t), io);
return 0;
}
static SysBusDeviceInfo iommu_info = {
.init = iommu_init1,
.qdev.name = "iommu",
.qdev.size = sizeof(IOMMUState),
.qdev.vmsd = &vmstate_iommu,
.qdev.reset = iommu_reset,
.qdev.props = (Property[]) {
DEFINE_PROP_HEX32("version", IOMMUState, version, 0),
DEFINE_PROP_END_OF_LIST(),
}
};
static void iommu_register_devices(void)
{
sysbus_register_withprop(&iommu_info);
}
device_init(iommu_register_devices)