iommu.c
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/*
* QEMU SPARC iommu emulation
*
* Copyright (c) 2003 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"
/* debug iommu */
//#define DEBUG_IOMMU
/* The IOMMU registers occupy three pages in IO space. */
struct iommu_regs {
/* First page */
volatile unsigned long control; /* IOMMU control */
volatile unsigned long base; /* Physical base of iopte page table */
volatile unsigned long _unused1[3];
volatile unsigned long tlbflush; /* write only */
volatile unsigned long pageflush; /* write only */
volatile unsigned long _unused2[1017];
/* Second page */
volatile unsigned long afsr; /* Async-fault status register */
volatile unsigned long afar; /* Async-fault physical address */
volatile unsigned long _unused3[2];
volatile unsigned long sbuscfg0; /* SBUS configuration registers, per-slot */
volatile unsigned long sbuscfg1;
volatile unsigned long sbuscfg2;
volatile unsigned long sbuscfg3;
volatile unsigned long mfsr; /* Memory-fault status register */
volatile unsigned long mfar; /* Memory-fault physical address */
volatile unsigned long _unused4[1014];
/* Third page */
volatile unsigned long mid; /* IOMMU module-id */
};
#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_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 0x00f00000 /* Reserver, 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_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_MFSR_ERR 0x80000000 /* One or more of PERR1 or PERR0 */
#define IOMMU_MFSR_S 0x01000000 /* Sparc was in supervisor mode */
#define IOMMU_MFSR_CPU 0x00800000 /* CPU transaction caused parity error */
#define IOMMU_MFSR_ME 0x00080000 /* Multiple parity errors occurred */
#define IOMMU_MFSR_PERR 0x00006000 /* high bit indicates parity error occurred
on the even word of the access, low bit
indicated odd word caused the parity error */
#define IOMMU_MFSR_BM 0x00001000 /* Error occurred while in boot mode */
#define IOMMU_MFSR_C 0x00000800 /* Address causing error was marked cacheable */
#define IOMMU_MFSR_RTYP 0x000000f0 /* Memory request transaction type */
#define IOMMU_MID_SBAE 0x001f0000 /* SBus arbitration enable */
#define IOMMU_MID_SE 0x00100000 /* Enables SCSI/ETHERNET arbitration */
#define IOMMU_MID_SB3 0x00080000 /* Enable SBUS device 3 arbitration */
#define IOMMU_MID_SB2 0x00040000 /* Enable SBUS device 2 arbitration */
#define IOMMU_MID_SB1 0x00020000 /* Enable SBUS device 1 arbitration */
#define IOMMU_MID_SB0 0x00010000 /* Enable SBUS device 0 arbitration */
#define IOMMU_MID_MID 0x0000000f /* Module-id, hardcoded to 0x8 */
/* 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 {
uint32_t addr;
uint32_t regs[sizeof(struct iommu_regs)];
uint32_t iostart;
} IOMMUState;
static IOMMUState *ps;
static uint32_t iommu_mem_readw(void *opaque, target_phys_addr_t addr)
{
IOMMUState *s = opaque;
uint32_t saddr;
saddr = (addr - s->addr) >> 2;
switch (saddr) {
default:
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;
uint32_t saddr;
saddr = (addr - s->addr) >> 2;
switch (saddr) {
case 0:
switch (val & IOMMU_CTRL_RNGE) {
case IOMMU_RNGE_16MB:
s->iostart = 0xff000000;
break;
case IOMMU_RNGE_32MB:
s->iostart = 0xfe000000;
break;
case IOMMU_RNGE_64MB:
s->iostart = 0xfc000000;
break;
case IOMMU_RNGE_128MB:
s->iostart = 0xf8000000;
break;
case IOMMU_RNGE_256MB:
s->iostart = 0xf0000000;
break;
case IOMMU_RNGE_512MB:
s->iostart = 0xe0000000;
break;
case IOMMU_RNGE_1GB:
s->iostart = 0xc0000000;
break;
default:
case IOMMU_RNGE_2GB:
s->iostart = 0x80000000;
break;
}
/* Fall through */
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,
};
uint32_t iommu_translate(uint32_t addr)
{
uint32_t *iopte = (void *)(ps->regs[1] << 4), pa;
iopte += ((addr - ps->iostart) >> PAGE_SHIFT);
cpu_physical_memory_rw((uint32_t)iopte, (void *) &pa, 4, 0);
bswap32s(&pa);
pa = (pa & IOPTE_PAGE) << 4; /* Loose higher bits of 36 */
return pa + (addr & PAGE_MASK);
}
void iommu_init(uint32_t addr)
{
IOMMUState *s;
int iommu_io_memory;
s = qemu_mallocz(sizeof(IOMMUState));
if (!s)
return;
s->addr = addr;
iommu_io_memory = cpu_register_io_memory(0, iommu_mem_read, iommu_mem_write, s);
cpu_register_physical_memory(addr, sizeof(struct iommu_regs),
iommu_io_memory);
ps = s;
}