/*
* QEMU SPARC 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 "hw.h"
#include "sun4m.h"
/* debug iommu */
//#define DEBUG_IOMMU
#ifdef DEBUG_IOMMU
#define DPRINTF(fmt, args...) \
do { printf("IOMMU: " fmt , ##args); } while (0)
#else
#define DPRINTF(fmt, args...)
#endif
#define IOMMU_NREGS (3*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_AFAR (0x1004 >> 2)
#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
/* The format of an iopte in the page tables */
#define IOPTE_PAGE 0x07ffff00 /* Physical page number (PA[30:12]) */
#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 PAGE_SHIFT 12
#define PAGE_SIZE (1 << PAGE_SHIFT)
#define PAGE_MASK (PAGE_SIZE - 1)
typedef struct IOMMUState {
target_phys_addr_t addr;
uint32_t regs[IOMMU_NREGS];
target_phys_addr_t iostart;
uint32_t version;
} IOMMUState;
static uint32_t iommu_mem_readw(void *opaque, target_phys_addr_t addr)
{
IOMMUState *s = opaque;
target_phys_addr_t saddr;
saddr = (addr - s->addr) >> 2;
switch (saddr) {
default:
DPRINTF("read reg[%d] = %x\n", (int)saddr, s->regs[saddr]);
return s->regs[saddr];
break;
}
return 0;
}
static void iommu_mem_writew(void *opaque, target_phys_addr_t addr,
uint32_t val)
{
IOMMUState *s = opaque;
target_phys_addr_t saddr;
saddr = (addr - s->addr) >> 2;
DPRINTF("write reg[%d] = %x\n", (int)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;
}
DPRINTF("iostart = " TARGET_FMT_plx "\n", 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:
DPRINTF("tlb flush %x\n", val);
s->regs[saddr] = val & IOMMU_TLBFLUSH_MASK;
break;
case IOMMU_PGFLUSH:
DPRINTF("page flush %x\n", val);
s->regs[saddr] = val & IOMMU_PGFLUSH_MASK;
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;
default:
s->regs[saddr] = val;
break;
}
}
static CPUReadMemoryFunc *iommu_mem_read[3] = {
iommu_mem_readw,
iommu_mem_readw,
iommu_mem_readw,
};
static CPUWriteMemoryFunc *iommu_mem_write[3] = {
iommu_mem_writew,
iommu_mem_writew,
iommu_mem_writew,
};
static uint32_t iommu_page_get_flags(IOMMUState *s, target_phys_addr_t addr)
{
uint32_t ret;
target_phys_addr_t iopte;
#ifdef DEBUG_IOMMU
target_phys_addr_t pa = addr;
#endif
iopte = s->regs[IOMMU_BASE] << 4;
addr &= ~s->iostart;
iopte += (addr >> (PAGE_SHIFT - 2)) & ~3;
cpu_physical_memory_read(iopte, (uint8_t *)&ret, 4);
tswap32s(&ret);
DPRINTF("get flags addr " TARGET_FMT_plx " => pte " TARGET_FMT_plx
", *pte = %x\n", pa, iopte, ret);
return ret;
}
static target_phys_addr_t iommu_translate_pa(IOMMUState *s,
target_phys_addr_t addr,
uint32_t pte)
{
uint32_t tmppte;
target_phys_addr_t pa;
tmppte = pte;
pa = ((pte & IOPTE_PAGE) << 4) + (addr & PAGE_MASK);
DPRINTF("xlate dva " TARGET_FMT_plx " => pa " TARGET_FMT_plx
" (iopte = %x)\n", addr, pa, tmppte);
return pa;
}
static void iommu_bad_addr(IOMMUState *s, target_phys_addr_t addr,
int is_write)
{
DPRINTF("bad addr " TARGET_FMT_plx "\n", 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;
}
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 & TARGET_PAGE_MASK;
l = (page + TARGET_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(opaque, addr, flags);
if (is_write) {
if (!(flags & IOPTE_WRITE)) {
iommu_bad_addr(opaque, page, is_write);
return;
}
cpu_physical_memory_write(phys_addr, buf, len);
} else {
cpu_physical_memory_read(phys_addr, buf, len);
}
len -= l;
buf += l;
addr += l;
}
}
static void iommu_save(QEMUFile *f, void *opaque)
{
IOMMUState *s = opaque;
int i;
for (i = 0; i < IOMMU_NREGS; i++)
qemu_put_be32s(f, &s->regs[i]);
qemu_put_be64s(f, &s->iostart);
}
static int iommu_load(QEMUFile *f, void *opaque, int version_id)
{
IOMMUState *s = opaque;
int i;
if (version_id != 2)
return -EINVAL;
for (i = 0; i < IOMMU_NREGS; i++)
qemu_get_be32s(f, &s->regs[i]);
qemu_get_be64s(f, &s->iostart);
return 0;
}
static void iommu_reset(void *opaque)
{
IOMMUState *s = opaque;
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;
}
void *iommu_init(target_phys_addr_t addr, uint32_t version)
{
IOMMUState *s;
int iommu_io_memory;
s = qemu_mallocz(sizeof(IOMMUState));
if (!s)
return NULL;
s->addr = addr;
s->version = version;
iommu_io_memory = cpu_register_io_memory(0, iommu_mem_read,
iommu_mem_write, s);
cpu_register_physical_memory(addr, IOMMU_NREGS * 4, iommu_io_memory);
register_savevm("iommu", addr, 2, iommu_save, iommu_load, s);
qemu_register_reset(iommu_reset, s);
iommu_reset(s);
return s;
}
