C++ ptoa函数代码示例

static void
cpu_startup(void *dummy)
{

	/*
	 * Initialise the decrementer-based clock.
	 */
	decr_init();

	/*
	 * Good {morning,afternoon,evening,night}.
	 */
	cpu_setup(PCPU_GET(cpuid));

#ifdef PERFMON
	perfmon_init();
#endif
	printf("real memory  = %ju (%ju MB)\n", ptoa((uintmax_t)physmem),
	    ptoa((uintmax_t)physmem) / 1048576);
	realmem = physmem;

	if (bootverbose)
		printf("available KVA = %zu (%zu MB)\n",
		    virtual_end - virtual_avail,
		    (virtual_end - virtual_avail) / 1048576);

	/*
	 * Display any holes after the first chunk of extended memory.
	 */
	if (bootverbose) {
		int indx;

		printf("Physical memory chunk(s):\n");
		for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
			vm_paddr_t size1 =
			    phys_avail[indx + 1] - phys_avail[indx];

			#ifdef __powerpc64__
			printf("0x%016jx - 0x%016jx, %jd bytes (%jd pages)\n",
			#else
			printf("0x%09jx - 0x%09jx, %ju bytes (%ju pages)\n",
			#endif
			    (uintmax_t)phys_avail[indx],
			    (uintmax_t)phys_avail[indx + 1] - 1,
			    (uintmax_t)size1, (uintmax_t)size1 / PAGE_SIZE);
		}
	}

	vm_ksubmap_init(&kmi);

	printf("avail memory = %ju (%ju MB)\n",
	    ptoa((uintmax_t)vm_cnt.v_free_count),
	    ptoa((uintmax_t)vm_cnt.v_free_count) / 1048576);

	/*
	 * Set up buffers, so they can be used to read disk labels.
	 */
	bufinit();
	vm_pager_bufferinit();
}

/*
 * Prevent loading a kernel if it would overlap the SRM.
 */
int
check_phdr(void *hdr)
{
	Elf64_Phdr *phdr = (Elf64_Phdr *)hdr;
	struct rpb *hwrpb = (struct rpb *)HWRPB_ADDR;
	struct mddt *mddtp;
	struct mddt_cluster *memc;
	u_int64_t cstart, cend;
	u_int64_t i;

	mddtp = (struct mddt *)(((caddr_t)hwrpb) + hwrpb->rpb_memdat_off);
	for (i = 0; i < mddtp->mddt_cluster_cnt; i++) {
		memc = &mddtp->mddt_clusters[i];
		if (memc->mddt_usage & MDDT_PALCODE) {
			cstart = ALPHA_PHYS_TO_K0SEG(ptoa(memc->mddt_pfn));
			cend = cstart + ptoa(memc->mddt_pg_cnt);

			if (phdr->p_vaddr + phdr->p_memsz <= cstart ||
			    phdr->p_vaddr >= cend)
				continue;

			printf("SRM console and kernel image would overlap.\n"
			    "Please report this to <[email protected]>, "
			    "with the following values:\n"
			    "SRM range: %p-%p\n"
			    "kernel range: %p-%p\n",
			    cstart, cend, phdr->p_vaddr,
			    phdr->p_vaddr + phdr->p_memsz);
			return 1;
		}
	}

	return 0;
}

void
sh_startup()
{
	vaddr_t minaddr, maxaddr;

	printf("%s", version);
	if (*cpu_model != '\0')
		printf("%s\n", cpu_model);
#ifdef DEBUG
	printf("general exception handler:\t%d byte\n",
	    sh_vector_generic_end - sh_vector_generic);
	printf("TLB miss exception handler:\t%d byte\n",
#if defined(SH3) && defined(SH4)
	    CPU_IS_SH3 ? sh3_vector_tlbmiss_end - sh3_vector_tlbmiss :
	    sh4_vector_tlbmiss_end - sh4_vector_tlbmiss
#elif defined(SH3)
	    sh3_vector_tlbmiss_end - sh3_vector_tlbmiss
#elif defined(SH4)
	    sh4_vector_tlbmiss_end - sh4_vector_tlbmiss
#endif
	    );
	printf("interrupt exception handler:\t%d byte\n",
	    sh_vector_interrupt_end - sh_vector_interrupt);
#endif /* DEBUG */

	printf("real mem = %u (%uMB)\n", ptoa(physmem),
	    ptoa(physmem) / 1024 / 1024);

	/*
	 * Allocate a submap for exec arguments.  This map effectively
	 * limits the number of processes exec'ing at any time.
	 */
	minaddr = vm_map_min(kernel_map);
	exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
	    16 * NCARGS, VM_MAP_PAGEABLE, FALSE, NULL);

	/*
	 * Allocate a submap for physio
	 */
	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
	    VM_PHYS_SIZE, 0, FALSE, NULL);

	/*
	 * Set up buffers, so they can be used to read disk labels.
	 */
	bufinit();

	printf("avail mem = %lu (%luMB)\n", ptoa(uvmexp.free),
	    ptoa(uvmexp.free) / 1024 / 1024);

	if (boothowto & RB_CONFIG) {
#ifdef BOOT_CONFIG
		user_config();
#else
		printf("kernel does not support -c; continuing..\n");
#endif 
	}
}

void
cpu_startup()
{
	vaddr_t minaddr, maxaddr;

	/*
	 * Good {morning,afternoon,evening,night}.
	 */
	printf(version);
	printf("real mem = %lu (%luMB)\n", ptoa(physmem),
	    ptoa(physmem)/1024/1024);

	/*
	 * Grab machine dependent memory spaces
	 */
	platform->startup();

	/*
	 * Allocate a submap for exec arguments.  This map effectively
	 * limits the number of processes exec'ing at any time.
	 */
	minaddr = vm_map_min(kernel_map);
	exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
	    16 * NCARGS, VM_MAP_PAGEABLE, FALSE, NULL);

	/*
	 * Allocate map for physio.
	 */
	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
	    VM_PHYS_SIZE, 0, FALSE, NULL);

	printf("avail mem = %lu (%luMB)\n", ptoa(uvmexp.free),
	    ptoa(uvmexp.free)/1024/1024);

	/*
	 * Set up buffers, so they can be used to read disk labels.
	 */
	bufinit();

	/*
	 * Configure the system.
	 */
	if (boothowto & RB_CONFIG) {
#ifdef BOOT_CONFIG
		user_config();
#else
		printf("kernel does not support -c; continuing..\n");
#endif
	}
}

/*
 * Dynamically set the start address for rbus.  This must be called
 * before rbus is initialized.  The start address should be determined
 * by the amount of installed memory.  Generally 1 GB has been found
 * to be a good value, but it fails on some Thinkpads (e.g. 2645-4AU),
 * for which 0.5 GB is a good value.  It also fails on (at least)
 * Thinkpads with 2GB of RAM, for which 2 GB is a good value.
 *
 * Thus, a general strategy of setting rbus_min_start to the amount of
 * memory seems in order.  However, the actual amount of memory is
 * generally slightly more than the amount found, e.g. 1014MB vs 1024,
 * or 2046 vs 2048.
 */
bus_addr_t
rbus_min_start_hint(void)
{
	bus_addr_t rbus_min_start = RBUS_MIN_START;
	size_t ram = ptoa(physmem);

	if (ram <= 192 * 1024 * 1024UL) {
		/*
		 * <= 192 MB, so try 0.5 GB.  This will work on
		 * Thinkpad 600E (2645-4AU), which fails at 1 GB, and
		 * on some other older machines that may have trouble
		 * with addresses needing more than 20 bits.
		 */
		rbus_min_start = 512 * 1024 * 1024UL;
	}

	if (ram >= 1024 * 1024 * 1024UL) {
		/*
		 * > 1 GB, so try 2 GB.
		 */
		rbus_min_start =  2 * 1024 * 1024 * 1024UL;
	}

	/* Not tested in > 2 GB case. */
	if (ram > 2 * 1024 * 1024 * 1024UL) {
		/*
		 * > 2 GB, so try 3 GB.
		 */
		rbus_min_start =  3 * 1024 * 1024 * 1024UL;
	}

	return (rbus_min_start);
}

void
vm_mem_bootstrap(void)
{
	vm_offset_t	start, end;

	/*
	 *	Initializes resident memory structures.
	 *	From here on, all physical memory is accounted for,
	 *	and we use only virtual addresses.
	 */

	vm_page_bootstrap(&start, &end);

	/*
	 *	Initialize other VM packages
	 */

	zone_bootstrap();
	vm_object_bootstrap();
	vm_map_init();
	kmem_init(start, end);
	pmap_init();
	zone_init((vm_size_t)ptoa(vm_page_free_count));
	kalloc_init();
#if	MACH_RT
	rtalloc_init();
#endif	/* MACH_RT */
	vm_fault_init();
	vm_page_module_init();
	memory_manager_default_init();
}

int drm_mmap(struct dev_mmap_args *ap)
{
	struct cdev *kdev = ap->a_head.a_dev;
	vm_offset_t offset = ap->a_offset;
	struct drm_device *dev = drm_get_device_from_kdev(kdev);
	struct drm_file *file_priv = NULL;
	drm_local_map_t *map;
	enum drm_map_type type;
	vm_paddr_t phys;

        DRM_LOCK();
        file_priv = drm_find_file_by_proc(dev, DRM_CURPROC);
        DRM_UNLOCK();

        if (file_priv == NULL) {
                DRM_ERROR("can't find authenticator\n");
                return EINVAL;
        }

        if (!file_priv->authenticated)
                return EACCES;

	if (dev->dma && offset < ptoa(dev->dma->page_count)) {
		drm_device_dma_t *dma = dev->dma;

		DRM_SPINLOCK(&dev->dma_lock);

		if (dma->pagelist != NULL) {
			unsigned long page = offset >> PAGE_SHIFT;
			unsigned long phys = dma->pagelist[page];
			ap->a_result = atop(phys);
			DRM_SPINUNLOCK(&dev->dma_lock);
			return 0;
		} else {

/*
 * This is called by configure to set dumplo and dumpsize.
 * Dumps always skip the first PAGE_SIZE of disk space
 * in case there might be a disk label stored there.
 * If there is extra space, put dump at the end to
 * reduce the chance that swapping trashes it.
 */
void
dumpconf(void)
{
	int nblks;	/* size of dump area */

	if (dumpdev == NODEV ||
	    (nblks = (bdevsw[major(dumpdev)].d_psize)(dumpdev)) == 0)
		return;
	if (nblks <= ctod(1))
		return;

	dumpsize = physmem;

	/* aviion only uses a single segment. */
	cpu_kcore_hdr.ram_segs[0].start = 0;
	cpu_kcore_hdr.ram_segs[0].size = ptoa(physmem);
	cpu_kcore_hdr.cputype = cputyp;

	/*
	 * Don't dump on the first block
	 * in case the dump device includes a disk label.
	 */
	if (dumplo < ctod(1))
		dumplo = ctod(1);

	/* Put dump at end of partition, and make it fit. */
	if (dumpsize + 1 > dtoc(nblks - dumplo))
		dumpsize = dtoc(nblks - dumplo) - 1;
	if (dumplo < nblks - ctod(dumpsize) - 1)
		dumplo = nblks - ctod(dumpsize) - 1;
}

paddr_t
drmmmap(dev_t kdev, off_t offset, int prot)
{
	struct drm_device *dev = drm_get_device_from_kdev(kdev);
	drm_local_map_t *map;
	struct drm_file *priv;
	drm_map_type_t type;
	paddr_t phys;

	DRM_LOCK();
	priv = drm_find_file_by_minor(dev, minor(kdev));
	DRM_UNLOCK();
	if (priv == NULL) {
		DRM_ERROR("can't find authenticator\n");
		return (EINVAL);
	}

	if (!priv->authenticated)
		return (EACCES);

	if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) {
		drm_device_dma_t *dma = dev->dma;

		DRM_SPINLOCK(&dev->dma_lock);

		if (dma->pagelist != NULL) {
			unsigned long page = offset >> PAGE_SHIFT;
			unsigned long phys = dma->pagelist[page];

			DRM_SPINUNLOCK(&dev->dma_lock);
			return (atop(phys));
		} else {

paddr_t drm_mmap(dev_t kdev, off_t offset, int prot)
{
	DRM_DEVICE;
	drm_local_map_t *map;
	drm_file_t *priv;
	drm_map_type_t type;
	paddr_t phys;
	uintptr_t roffset;

	DRM_LOCK();
	priv = drm_find_file_by_proc(dev, DRM_CURPROC);
	DRM_UNLOCK();
	if (priv == NULL) {
		DRM_ERROR("can't find authenticator\n");
		return -1;
	}

	if (!priv->authenticated)
		return -1;

	if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) {
		drm_device_dma_t *dma = dev->dma;

		DRM_SPINLOCK(&dev->dma_lock);

		if (dma->pagelist != NULL) {
			unsigned long page = offset >> PAGE_SHIFT;
			unsigned long pphys = dma->pagelist[page];

#ifdef macppc
			return pphys;
#else
			return atop(pphys);
#endif
		} else {

void *
cpu_uarea_alloc(bool system)
{
	struct pglist pglist;
	int error;

	/*
	 * Allocate a new physically contiguous uarea which can be
	 * direct-mapped.
	 */
	error = uvm_pglistalloc(USPACE, 0, ptoa(physmem), 0, 0, &pglist, 1, 1);
	if (error) {
		return NULL;
	}

	/*
	 * Get the physical address from the first page.
	 */
	const struct vm_page * const pg = TAILQ_FIRST(&pglist);
	KASSERT(pg != NULL);
	const paddr_t pa = VM_PAGE_TO_PHYS(pg);

	/*
	 * We need to return a direct-mapped VA for the pa.
	 */

	return (void *)PMAP_MAP_POOLPAGE(pa);
}

/*
 * cpu_startup: allocate memory for variable-sized tables,
 * initialize CPU, and do autoconfiguration.
 */
void
cpu_startup(void)
{
	vaddr_t minaddr, maxaddr;
#ifdef DEBUG
	extern int pmapdebug;
	int opmapdebug = pmapdebug;

	pmapdebug = 0;
#endif

	cpu_setmodel("FIC8234");
	if (fputype != FPU_NONE)
		m68k_make_fpu_idle_frame();

	/*
	 * Good {morning,afternoon,evening,night}.
	 */
	printf("%s%s", copyright, version);
	identifycpu();
	printf("real mem  = %d\n", ctob(physmem));

	minaddr = 0;

	/*
	 * Allocate a submap for physio
	 */
	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
				   VM_PHYS_SIZE, 0, false, NULL);

#ifdef DEBUG
	pmapdebug = opmapdebug;
#endif
	printf("avail mem = %ld\n", ptoa(uvmexp.free));
}

/*
 * Allocate memory for variable-sized tables,
 */
void
cpu_startup(void)
{
	vaddr_t minaddr, maxaddr;
	char pbuf[9];

	/*
	 * Good {morning,afternoon,evening,night}.
	 */
	printf("%s%s", copyright, version);
	format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
	printf("total memory = %s\n", pbuf);

	minaddr = 0;
	/*
	 * Allocate a submap for physio.
	 */
	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, VM_PHYS_SIZE,
	    0, false, NULL);


	/*
	 * (No need to allocate an mbuf cluster submap.  Mbuf clusters
	 * are allocated via the pool allocator, and we use KSEG to
	 * map those pages.)
	 */

	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
	printf("avail memory = %s\n", pbuf);
}

void
dumpconf(void)
{
	int nblks, block;

	if (dumpdev == NODEV ||
	    (nblks = (bdevsw[major(dumpdev)].d_psize)(dumpdev)) == 0)
		return;
	if (nblks <= ctod(1))
		return;

	dumpsize = physmem;

	/* Always skip the first CLBYTES, in case there is a label there. */
	if (dumplo < ctod(1))
		dumplo = ctod(1);

	/* Put dump at end of partition, and make it fit. */
	if (dumpsize + 1 > dtoc(nblks - dumplo))
		dumpsize = dtoc(nblks - dumplo) - 1;
	if (dumplo < nblks - ctod(dumpsize) - 1)
		dumplo = nblks - ctod(dumpsize) - 1;

	for (block = 0; block < bootconfig.dramblocks; block++) {
		cpu_kcore_hdr.ram_segs[block].start =
		    bootconfig.dram[block].address;
		cpu_kcore_hdr.ram_segs[block].size =
		    ptoa(bootconfig.dram[block].pages);
	}
}

paddr_t
mmmmap(dev_t dev, off_t off, int prot)
{
	struct proc *p = curproc;	/* XXX */

	switch (minor(dev)) {
	/* minor device 0 is physical memory */
	case 0:
		if ((u_int)off > ptoa(physmem) && suser(p) != 0)
			return -1;
		return off;

#ifdef APERTURE
	/* minor device 4 is aperture driver */
	case 4:
		/* Check if a write combining mapping is requested. */
		if (off >= MEMRANGE_WC_RANGE)
			off = (off - MEMRANGE_WC_RANGE) | PMAP_WC;

		switch (allowaperture) {
		case 1:
			/* Allow mapping of the VGA framebuffer & BIOS only */
			if ((off >= VGA_START && off <= BIOS_END) ||
			    (unsigned)off > (unsigned)ptoa(physmem))
				return off;
			else
				return -1;
		case 2:
		case 3:
			/* Allow mapping of the whole 1st megabyte
			   for x86emu */
			if (off <= BIOS_END ||
			    (unsigned)off > (unsigned)ptoa(physmem))
				return off;
			else
				return -1;
		default:
			return -1;
		}
			
#endif
	default:
		return -1;
	}
}