/* * 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 (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_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 PAGE_SHIFT 12 #define PAGE_SIZE (1 << PAGE_SHIFT) #define PAGE_MASK (PAGE_SIZE - 1) typedef struct IOMMUState { 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; } DPRINTF("read reg[%d] = %x\n", (int)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; 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_AFAR: s->regs[saddr] = val; qemu_irq_lower(s->irq); 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 *iommu_mem_read[3] = { NULL, NULL, iommu_mem_readl, }; static CPUWriteMemoryFunc *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; #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(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; 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 & 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(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 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; s->regs[IOMMU_MASK_ID] = IOMMU_TS_MASK; qemu_irq_lower(s->irq); } void *iommu_init(target_phys_addr_t addr, uint32_t version, qemu_irq irq) { IOMMUState *s; int iommu_io_memory; s = qemu_mallocz(sizeof(IOMMUState)); if (!s) return NULL; s->version = version; s->irq = irq; 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; }