C++ MB函数代码示例

static int
hp_zx1_fetch_size(void)
{
	int size;

	size = hp_private.gart_size / MB(1);
	hp_zx1_sizes[0].size = size;
	agp_bridge->current_size = (void *) &hp_zx1_sizes[0];
	return size;
}

PathCache::PathCache():
        mCache(LruCache<PathDescription, PathTexture*>::kUnlimitedCapacity),
        mSize(0), mMaxSize(MB(DEFAULT_PATH_CACHE_SIZE)) {
    char property[PROPERTY_VALUE_MAX];
    if (property_get(PROPERTY_PATH_CACHE_SIZE, property, NULL) > 0) {
        INIT_LOGD("  Setting %s cache size to %sMB", name, property);
        setMaxSize(MB(atof(property)));
    } else {
        INIT_LOGD("  Using default %s cache size of %.2fMB", name, DEFAULT_PATH_CACHE_SIZE);
    }

    mCache.setOnEntryRemovedListener(this);

    GLint maxTextureSize;
    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTextureSize);
    mMaxTextureSize = maxTextureSize;

    mDebugEnabled = readDebugLevel() & kDebugCaches;
}

void packet_print(){
	short x = (X_SIGN(packet[0]) ? (packet[1] | (0xff << 8)) : packet[1]);
	short y = (Y_SIGN(packet[0]) ? (packet[2] | (0xff << 8)) : packet[2]);
	printf("B1=0x%x B2=0x%x B3=0x%x LB=%d MB=%d RB=%d XOV=%d YOV=%d X=%d Y=%d \n",
			packet[0], packet[1], packet[2],
			LB(packet[0]), MB(packet[0]), RB(packet[0]),
			X_OVF(packet[0]), Y_OVF(packet[0]),
			x, y);
	counter = 0;
}

/* read input into memory, and then multigest that */
static int
do_input(const char *alg, uint8_t *raw, const char *pat, const char *repl)
{
    ssize_t	 rc;
    size_t	 cc;
    char	*data;

    if ((data = calloc(1, MB(4))) != NULL) {
        for (cc = 0 ; cc < MB(4) ; cc += (size_t)rc) {
            if ((rc = read(fileno(stdin), &data[cc], MB(4) - cc)) <= 0) {
                break;
            }
        }
        multigest_data(alg, data, cc, raw, pat, repl);
        free(data);
        return 1;
    }
    return 0;
}

/***********************************************************************
* create prx heap from memory container 1("app")
***********************************************************************/
int32_t create_heap(int32_t size)
{
  mc_app = vsh_memory_container_by_id(1);
  if (!mc_app) return(-1);

  sys_memory_allocate_from_container(MB(size), mc_app, SYS_MEMORY_PAGE_SIZE_1M, &heap_mem);
  if (!heap_mem) return(-1);

  prx_heap = (uint32_t)heap_mem;
  return(0);
}

int __init mem_module_init(void)
{
	UINT phys, virt;
	printk("-----------------\n");
	printk("PAGE_OFFSET = %x\n", (UINT)PAGE_OFFSET);
	
	printk("This module addr: %x(%u MB)\n", (UINT)&virt, MB(&virt));
	phys = virt_to_phys((void*)&virt);
	printk("phys: %x(%u MB)\n", phys, MB(phys));
	
	
	/*申请的内存位于物理内存映射区域，与真实物理地址只有一个固定偏移*/
	free_pg = (void*)__get_free_page(0);
	virt = (UINT)free_pg;
	printk("->Free page mem: %x(%u MB)\n", virt, MB(virt));
	phys = virt_to_phys(free_pg);
	printk("phys: %x(%u MB)\n", phys, MB(phys));
	
	alloc_pg = alloc_page(GFP_KERNEL);
	virt = page_to_virt(alloc_pg);
	printk("->Alloc page mem: %x(%u MB)\n", virt, MB(virt));
	phys = virt_to_phys(alloc_pg);
	printk("phys: %x(%u MB)\n", phys, MB(phys));

	/*申请的内存位于物理内存映射区域，与真实物理地址只有一个固定偏移*/
	kmallocmem = (void*)kmalloc(100, 0);
	virt = (UINT)kmallocmem;
	printk("->Kmalloc mem: %x(%u MB)\n", virt, MB(virt));
	phys = virt_to_phys(kmallocmem);
	printk("phys: %x(%u MB)\n", phys, MB(phys));

	/*申请的内存位于vmalloc_start~vmalloc_end之间，与物理地址没有简短的转换关系*/
	vmallocmem = (void*)vmalloc(100000);
	virt = (UINT)vmallocmem;
	printk("->Vmalloc mem: %x(%u MB)\n", virt, MB(virt));
	phys = virt_to_phys(vmallocmem);
	printk("phys: %x(%u MB)\n", phys, MB(phys));
	
	printk("-----------------\n");
	return 0;
}

static size_t __init i830_tseg_size(void)
{
	u8 tmp = read_pci_config_byte(0, 0, 0, I830_ESMRAMC);

	if (!(tmp & TSEG_ENABLE))
		return 0;

	if (tmp & I830_TSEG_SIZE_1M)
		return MB(1);
	else
		return KB(512);
}

// Gera uma simulação da evolução do preço do ativo, já descontado na medida física.
void evolucao_real_bs(float T, float S0, float r, float sigma, size_t n, float mu, float *Tempos, float *S) {

	float *W;
	
	W = MB(n, T);
	for (size_t i = 0; i < n; i++)
	{
		S[i] = S0 * exp((mu - r - sigma*sigma / 2) * Tempos[i] + sigma * W[i]);
	}

	free(W);
}

TextureCache::TextureCache():
        mCache(GenerationCache<SkBitmap*, Texture*>::kUnlimitedCapacity),
        mSize(0), mMaxSize(MB(DEFAULT_TEXTURE_CACHE_SIZE)),
        mFlushRate(DEFAULT_TEXTURE_CACHE_FLUSH_RATE) {
    char property[PROPERTY_VALUE_MAX];
    if (property_get(PROPERTY_TEXTURE_CACHE_SIZE, property, NULL) > 0) {
        INIT_LOGD("  Setting texture cache size to %sMB", property);
        setMaxSize(MB(atof(property)));
    } else {
        INIT_LOGD("  Using default texture cache size of %.2fMB", DEFAULT_TEXTURE_CACHE_SIZE);
    }

    if (property_get(PROPERTY_TEXTURE_CACHE_FLUSH_RATE, property, NULL) > 0) {
        float flushRate = atof(property);
        INIT_LOGD("  Setting texture cache flush rate to %.2f%%", flushRate * 100.0f);
        setFlushRate(flushRate);
    } else {
        INIT_LOGD("  Using default texture cache flush rate of %.2f%%",
                DEFAULT_TEXTURE_CACHE_FLUSH_RATE * 100.0f);
    }

    init();
}

// Sove A*X=B by Gauss sweeper
// X: input=B, output=X
// A: input=A, output=destroyed
int dsolve_gauss_sweeper(int n, int NRHS, double *B, int LDB, double *A, int LDA)
{
  int i,j,k,l;
  double a,value;
  for(k=0; k<n; k++){
    //pivot select
    value=fabs(MA(k,k));
    for(l=k,j=k+1; j<n; j++){
      if(fabs(MA(j,k))>value) {l=j; value=fabs(MA(j,k));}
    }
    if(value==0) return l+1; //エラー処理
    if(l!=k){
      dmat_swap_rows(n,NRHS,B,LDB,k,l); //swap b(k) <-> b(l)
      dmat_swap_rows(n,n,A,LDA,k,l); //swap A(k,:) <-> A(l,:)
    }
    //ガウスの消去法
    //軸要素を1にする
    a=(1.0)/MA(k,k);
    for(j=k; j<n; j++) MA(k,j)*=a;
    for(j=0; j<NRHS; j++) MB(k,j)*=a;
    //軸要素以外が 0 になるように他の列から軸要素の列を引く
    for(i=k+1; i<n; i++){
      if(i!=k){
	a=MA(i,k);
	for(j=0; j<n; j++) MA(i,j)-=a*MA(k,j);
	for(j=0; j<NRHS; j++) MB(i,j)-=a*MB(k,j);
      }
    }
  }  
  //後退代入 x=inv(U)*b
  for(k=0; k<NRHS; k++){
    for(i=n-1; i>=0; i--){
      for(j=n-1; j>=i+1; j--) MB(i,k)-=MA(i,j)*MB(j,k);
    }
  }
  return 0;
}

static void __attribute__((constructor)) mallocsetup(void)
{
  hts_mutex_init(&mutex);

#if 0
  int size = MB(96);

  Lv2Syscall3(348, size, 0x400, (u64)&taddr);
#else

  int size = MB(256);
  int psize = MB(96);

  Lv2Syscall6(300, size, psize, 0xFFFFFFFFU, 0x200ULL, 1UL, (u64)&heap_base);

#endif

  total_avail = size;
  gpool = tlsf_create((void *)(intptr_t)heap_base, size);

  // Malloc is initialized now so we can safely do this

  http_path_add("/showtime/memstats", NULL, memstats, 1);
}

static size_t __init i845_tseg_size(void)
{
	u8 tmp = read_pci_config_byte(0, 0, 0, I845_ESMRAMC);

	if (!(tmp & TSEG_ENABLE))
		return 0;

	switch (tmp & I845_TSEG_SIZE_MASK) {
	case I845_TSEG_SIZE_512K:
		return KB(512);
	case I845_TSEG_SIZE_1M:
		return MB(1);
	default:
		WARN_ON(1);
		return 0;
	}
}

void gdev_fifo_push(struct gdev_ctx *ctx, uint64_t base, uint32_t len, int flags)
{
	uint64_t w = base | (uint64_t)len << 40 | (uint64_t)flags << 40;
	while (((ctx->fifo.ib_put + 1) & ctx->fifo.ib_mask) == ctx->fifo.ib_get) {
		uint32_t old = ctx->fifo.ib_get;
		ctx->fifo.ib_get = __gdev_fifo_read_reg(ctx, 0x88);
		if (old == ctx->fifo.ib_get) {
			SCHED_YIELD();
		}
	}
	ctx->fifo.ib_map[ctx->fifo.ib_put * 2] = w;
	ctx->fifo.ib_map[ctx->fifo.ib_put * 2 + 1] = w >> 32;
	ctx->fifo.ib_put++;
	ctx->fifo.ib_put &= ctx->fifo.ib_mask;
	MB(); /* is this needed? */
	ctx->dummy = ctx->fifo.ib_map[0]; /* flush writes */
	__gdev_fifo_write_reg(ctx, 0x8c, ctx->fifo.ib_put);
}

int test_config(void) {
	unsigned long byte;
	subscribe_mouse();
	mouse_write_byte(DISABLE_DATA_PACKETS);
	mouse_write_byte(STATUS_REQUEST);
	byte = mouse_read();
	if(byte == -1) return 1;
	printf("byte 1: 0x%X\n", byte);
	printf("Scaling: ");
	if(!SCALING(byte))
		printf("1:1  ");
	else
		printf("2:1  ");
	printf("Data Reporting: ");
	if(!DATA_REPORTING(byte))
		printf("disable  ");
	else
		printf("enable   ");
	printf("Mode: ");
	if(!MODE(byte))
		printf("remote mode\n\n");
	else
		printf("stream mode\n\n");
	if(LB(byte))
		printf("LB: pressed ");
	else
		printf("LB: not pressed ");
	if(RB(byte))
		printf("RB: pressed ");
	else
		printf("RB: not pressed ");
	if(MB(byte))
		printf("MB: pressed ");
	else
		printf("MB: not pressed ");
	byte = mouse_read();
	if(byte == -1) return 1;
	printf("\n byte 2: 0x%X\n", byte);
	printf("Resolution: %d\n\n", byte);
	byte = mouse_read();
	if(byte == -1) return 1;
	printf("byte 3: 0x%X\n", byte);
	printf("Sample Rate: %d\n\n", byte);
}

Thread::Thread( Process * ps, size_t entry )
{
	int sid = ps->SpaceId(), tid=0;
	this->prev = this->next = 0;
	this->disposed = false;
	ti = 0;
	//setup thread information block Tib
	size_t remote_addr = (size_t)SysAllocateMemory( sid, PAGE_SIZE, MEMORY_ATTR_WRITE, ALLOC_HIGHMEM );
	if( remote_addr ==0  )
		goto bed;
	if( MapAddress( sid, SysGetCurrentSpaceId(), remote_addr, (size_t*)&ti ) < 0 )
		goto bed;
	memset( (void*)ti, 0, sizeof(ThreadInformation) );
	ti->StackLimit = MB(2);
	ti->StackBase = (size_t)SysAllocateMemory( sid, ti->StackLimit, MEMORY_ATTR_WRITE, ALLOC_LAZY );
	ti->ProcessInformation = ps->GetInformation()->Self;
	ti->Self = (ThreadInformation*)remote_addr;
	ti->Environment = 0;
	ti->ProcessId = ps->ProcessId();
	ti->ErrorCode = 0;
	ti->EntryAddress = entry;
	ti->SpaceInformation = 0;
	ti->SpaceId = sid;
	tid = SysCreateThread( sid, entry, ti->StackLimit, ti->StackBase, (void*)remote_addr );
	this->threadId = tid;
	this->spaceId = sid;
	ti->ThreadId = tid;
	if( tid < 0 )
		goto bed;
	this->process = ps;
	if( ps->mainThread ){
		Thread* t; 
		for( t=ps->mainThread; t->next; t=t->next );
		t->next = this;
		this->next = 0;
		this->prev = t;
	}else{
		this->prev = this->next = 0;
		ps->mainThread = this;
	}
	return;
bed:
	Dispose();
}