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Diffstat (limited to 'hw/iommu.c')
| -rw-r--r-- | hw/iommu.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/hw/iommu.c b/hw/iommu.c new file mode 100644 index 0000000000..f00bb78b03 --- /dev/null +++ b/hw/iommu.c @@ -0,0 +1,221 @@ +/* + * 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 PHYS_JJ_IOMMU 0x10000000 /* First page of sun4m IOMMU */ +#define PAGE_SHIFT 12 +#define PAGE_SIZE (1 << PAGE_SHIFT) +#define PAGE_MASK (PAGE_SIZE - 1) + +typedef struct IOMMUState { + uint32_t regs[sizeof(struct iommu_regs)]; +} IOMMUState; + +static IOMMUState *ps; + +static int iommu_io_memory; + +static void iommu_reset(IOMMUState *s) +{ +} + +static uint32_t iommu_mem_readw(void *opaque, target_phys_addr_t addr) +{ + IOMMUState *s = opaque; + uint32_t saddr; + + saddr = (addr - PHYS_JJ_IOMMU) >> 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 - PHYS_JJ_IOMMU) >> 2; + switch (saddr) { + 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, iostart; + + switch (ps->regs[0] & IOMMU_CTRL_RNGE) { + case IOMMU_RNGE_16MB: + iostart = 0xff000000; + break; + case IOMMU_RNGE_32MB: + iostart = 0xfe000000; + break; + case IOMMU_RNGE_64MB: + iostart = 0xfc000000; + break; + case IOMMU_RNGE_128MB: + iostart = 0xf8000000; + break; + case IOMMU_RNGE_256MB: + iostart = 0xf0000000; + break; + case IOMMU_RNGE_512MB: + iostart = 0xe0000000; + break; + case IOMMU_RNGE_1GB: + iostart = 0xc0000000; + break; + default: + case IOMMU_RNGE_2GB: + iostart = 0x80000000; + break; + } + + iopte += ((addr - 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 + PAGE_SIZE; + return pa + (addr & PAGE_MASK); +} + +void iommu_init() +{ + IOMMUState *s; + + s = qemu_mallocz(sizeof(IOMMUState)); + if (!s) + return; + + iommu_io_memory = cpu_register_io_memory(0, iommu_mem_read, iommu_mem_write, s); + cpu_register_physical_memory(PHYS_JJ_IOMMU, sizeof(struct iommu_regs), + iommu_io_memory); + + iommu_reset(s); + ps = s; +} + |