helper.c

qemu虚拟机代码

		pde_ptr = ((address & 0x3f000) >> 10) + ((pde & ~3) << 4);
                pde = ldl_phys(pde_ptr);

		switch (pde & PTE_ENTRYTYPE_MASK) {
		default:
		case 0: /* Invalid */
		case 1: /* PDE, should not happen */
		case 3: /* Reserved */
		    return 0;
		case 2: /* L3 PTE */
		    return pde;
		}
	    }
	}
    }
    return 0;
}

#ifdef DEBUG_MMU
void dump_mmu(CPUState *env)
{
     target_ulong va, va1, va2;
     unsigned int n, m, o;
     target_phys_addr_t pde_ptr, pa;
    uint32_t pde;

    printf("MMU dump:\n");
    pde_ptr = (env->mmuregs[1] << 4) + (env->mmuregs[2] << 2);
    pde = ldl_phys(pde_ptr);
    printf("Root ptr: " TARGET_FMT_lx ", ctx: %d\n", env->mmuregs[1] << 4, env->mmuregs[2]);
    for (n = 0, va = 0; n < 256; n++, va += 16 * 1024 * 1024) {
	pde_ptr = mmu_probe(env, va, 2);
	if (pde_ptr) {
	    pa = cpu_get_phys_page_debug(env, va);
 	    printf("VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PDE: " TARGET_FMT_lx "\n", va, pa, pde_ptr);
	    for (m = 0, va1 = va; m < 64; m++, va1 += 256 * 1024) {
		pde_ptr = mmu_probe(env, va1, 1);
		if (pde_ptr) {
		    pa = cpu_get_phys_page_debug(env, va1);
 		    printf(" VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PDE: " TARGET_FMT_lx "\n", va1, pa, pde_ptr);
		    for (o = 0, va2 = va1; o < 64; o++, va2 += 4 * 1024) {
			pde_ptr = mmu_probe(env, va2, 0);
			if (pde_ptr) {
			    pa = cpu_get_phys_page_debug(env, va2);
 			    printf("  VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PTE: " TARGET_FMT_lx "\n", va2, pa, pde_ptr);
			}
		    }
		}
	    }
	}
    }
    printf("MMU dump ends\n");
}
#endif /* DEBUG_MMU */

#else /* !TARGET_SPARC64 */
/*
 * UltraSparc IIi I/DMMUs
 */
static int get_physical_address_data(CPUState *env, target_phys_addr_t *physical, int *prot,
			  int *access_index, target_ulong address, int rw,
			  int is_user)
{
    target_ulong mask;
    unsigned int i;

    if ((env->lsu & DMMU_E) == 0) { /* DMMU disabled */
	*physical = address;
	*prot = PAGE_READ | PAGE_WRITE;
        return 0;
    }

    for (i = 0; i < 64; i++) {
	switch ((env->dtlb_tte[i] >> 61) & 3) {
	default:
	case 0x0: // 8k
	    mask = 0xffffffffffffe000ULL;
	    break;
	case 0x1: // 64k
	    mask = 0xffffffffffff0000ULL;
	    break;
	case 0x2: // 512k
	    mask = 0xfffffffffff80000ULL;
	    break;
	case 0x3: // 4M
	    mask = 0xffffffffffc00000ULL;
	    break;
	}
	// ctx match, vaddr match?
	if (env->dmmuregs[1] == (env->dtlb_tag[i] & 0x1fff) &&
	    (address & mask) == (env->dtlb_tag[i] & ~0x1fffULL)) {
	    // valid, access ok?
	    if ((env->dtlb_tte[i] & 0x8000000000000000ULL) == 0 ||
		((env->dtlb_tte[i] & 0x4) && is_user) ||
		(!(env->dtlb_tte[i] & 0x2) && (rw == 1))) {
		if (env->dmmuregs[3]) /* Fault status register */
		    env->dmmuregs[3] = 2; /* overflow (not read before another fault) */
		env->dmmuregs[3] |= (is_user << 3) | ((rw == 1) << 2) | 1;
		env->dmmuregs[4] = address; /* Fault address register */
		env->exception_index = TT_DFAULT;
#ifdef DEBUG_MMU
		printf("DFAULT at 0x%llx\n", address);
#endif
		return 1;
	    }
	    *physical = (env->dtlb_tte[i] & mask & 0x1fffffff000ULL) + (address & ~mask & 0x1fffffff000ULL);
	    *prot = PAGE_READ;
	    if (env->dtlb_tte[i] & 0x2)
		*prot |= PAGE_WRITE;
	    return 0;
	}
    }
#ifdef DEBUG_MMU
    printf("DMISS at 0x%llx\n", address);
#endif
    env->exception_index = TT_DMISS;
    return 1;
}

static int get_physical_address_code(CPUState *env, target_phys_addr_t *physical, int *prot,
			  int *access_index, target_ulong address, int rw,
			  int is_user)
{
    target_ulong mask;
    unsigned int i;

    if ((env->lsu & IMMU_E) == 0) { /* IMMU disabled */
	*physical = address;
	*prot = PAGE_EXEC;
        return 0;
    }

    for (i = 0; i < 64; i++) {
	switch ((env->itlb_tte[i] >> 61) & 3) {
	default:
	case 0x0: // 8k
	    mask = 0xffffffffffffe000ULL;
	    break;
	case 0x1: // 64k
	    mask = 0xffffffffffff0000ULL;
	    break;
	case 0x2: // 512k
	    mask = 0xfffffffffff80000ULL;
	    break;
	case 0x3: // 4M
	    mask = 0xffffffffffc00000ULL;
		break;
	}
	// ctx match, vaddr match?
	if (env->dmmuregs[1] == (env->itlb_tag[i] & 0x1fff) &&
	    (address & mask) == (env->itlb_tag[i] & ~0x1fffULL)) {
	    // valid, access ok?
	    if ((env->itlb_tte[i] & 0x8000000000000000ULL) == 0 ||
		((env->itlb_tte[i] & 0x4) && is_user)) {
		if (env->immuregs[3]) /* Fault status register */
		    env->immuregs[3] = 2; /* overflow (not read before another fault) */
		env->immuregs[3] |= (is_user << 3) | 1;
		env->exception_index = TT_TFAULT;
#ifdef DEBUG_MMU
		printf("TFAULT at 0x%llx\n", address);
#endif
		return 1;
	    }
	    *physical = (env->itlb_tte[i] & mask & 0x1fffffff000ULL) + (address & ~mask & 0x1fffffff000ULL);
	    *prot = PAGE_EXEC;
	    return 0;
	}
    }
#ifdef DEBUG_MMU
    printf("TMISS at 0x%llx\n", address);
#endif
    env->exception_index = TT_TMISS;
    return 1;
}

int get_physical_address(CPUState *env, target_phys_addr_t *physical, int *prot,
			  int *access_index, target_ulong address, int rw,
			  int is_user)
{
    if (rw == 2)
	return get_physical_address_code(env, physical, prot, access_index, address, rw, is_user);
    else
	return get_physical_address_data(env, physical, prot, access_index, address, rw, is_user);
}

/* Perform address translation */
int cpu_sparc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
                              int is_user, int is_softmmu)
{
    target_ulong virt_addr, vaddr;
    target_phys_addr_t paddr;
    int error_code = 0, prot, ret = 0, access_index;

    error_code = get_physical_address(env, &paddr, &prot, &access_index, address, rw, is_user);
    if (error_code == 0) {
	virt_addr = address & TARGET_PAGE_MASK;
	vaddr = virt_addr + ((address & TARGET_PAGE_MASK) & (TARGET_PAGE_SIZE - 1));
#ifdef DEBUG_MMU
	printf("Translate at 0x%llx -> 0x%llx, vaddr 0x%llx\n", address, paddr, vaddr);
#endif
	ret = tlb_set_page_exec(env, vaddr, paddr, prot, is_user, is_softmmu);
	return ret;
    }
    // XXX
    return 1;
}

#ifdef DEBUG_MMU
void dump_mmu(CPUState *env)
{
    unsigned int i;
    const char *mask;

    printf("MMU contexts: Primary: %lld, Secondary: %lld\n", env->dmmuregs[1], env->dmmuregs[2]);
    if ((env->lsu & DMMU_E) == 0) {
	printf("DMMU disabled\n");
    } else {
	printf("DMMU dump:\n");
	for (i = 0; i < 64; i++) {
	    switch ((env->dtlb_tte[i] >> 61) & 3) {
	    default:
	    case 0x0:
		mask = "  8k";
		break;
	    case 0x1:
		mask = " 64k";
		break;
	    case 0x2:
		mask = "512k";
		break;
	    case 0x3:
		mask = "  4M";
		break;
	    }
	    if ((env->dtlb_tte[i] & 0x8000000000000000ULL) != 0) {
		printf("VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx ", %s, %s, %s, %s, ctx %lld\n",
		       env->dtlb_tag[i] & ~0x1fffULL,
		       env->dtlb_tte[i] & 0x1ffffffe000ULL,
		       mask,
		       env->dtlb_tte[i] & 0x4? "priv": "user",
		       env->dtlb_tte[i] & 0x2? "RW": "RO",
		       env->dtlb_tte[i] & 0x40? "locked": "unlocked",
		       env->dtlb_tag[i] & 0x1fffULL);
	    }
	}
    }
    if ((env->lsu & IMMU_E) == 0) {
	printf("IMMU disabled\n");
    } else {
	printf("IMMU dump:\n");
	for (i = 0; i < 64; i++) {
	    switch ((env->itlb_tte[i] >> 61) & 3) {
	    default:
	    case 0x0:
		mask = "  8k";
		break;
	    case 0x1:
		mask = " 64k";
		break;
	    case 0x2:
		mask = "512k";
		break;
	    case 0x3:
		mask = "  4M";
		break;
	    }
	    if ((env->itlb_tte[i] & 0x8000000000000000ULL) != 0) {
		printf("VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx ", %s, %s, %s, ctx %lld\n",
		       env->itlb_tag[i] & ~0x1fffULL,
		       env->itlb_tte[i] & 0x1ffffffe000ULL,
		       mask,
		       env->itlb_tte[i] & 0x4? "priv": "user",
		       env->itlb_tte[i] & 0x40? "locked": "unlocked",
		       env->itlb_tag[i] & 0x1fffULL);
	    }
	}
    }
}
#endif /* DEBUG_MMU */

#endif /* TARGET_SPARC64 */
#endif /* !CONFIG_USER_ONLY */

void memcpy32(target_ulong *dst, const target_ulong *src)
{
    dst[0] = src[0];
    dst[1] = src[1];
    dst[2] = src[2];
    dst[3] = src[3];
    dst[4] = src[4];
    dst[5] = src[5];
    dst[6] = src[6];
    dst[7] = src[7];
}