writew(le16_to_cpu(w), base + offset); break; case 4: memcpy(&l, buf, sizeof l); writel(le32_to_cpu(l), base + offset); break; case 8: memcpy(&l, buf, sizeof l); writel(le32_to_cpu(l), base + offset); memcpy(&l, buf + sizeof l, sizeof l); writel(...
{ __iowrite32_copy(dev->mmio.regs + offset, data, DIV_ROUND_UP(len, 4)); } static void mt76_mmio_read_copy(struct mt76_dev *dev, u32 offset, void *data, int len) { __ioread32_copy(data, dev->mmio.regs + offset, DIV_ROUND_UP(len, 4)); } static int mt76_mmio_wr_...
erro reads: switch ((size | (int)addr) & 7) {case 1:case 3:case 5:case 7:io_writex(env, full, mmu_idx, val_le, addr, ra, MO_UB);val_le >>= 8;size -= 1;addr += 1;break;case 2:case 6:io_writex(env, full, mmu_idx, val_le, addr, ra, MO_LEUW);val_le >>=...
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writel(val, &hw_addr[reg_offset]); value = readl(&hw_addr[reg]); Device DAM 访问物理内存 首先,CPU基于虚拟机地址X,通过MMU,将数据写入物理地址Y对应的 物理内存中; 然后,CPU 调用如dma_map_single 这样的API,将总线地址Z 映射到 虚拟地址X和物理地址Y。
#definereadl(addr)__le32_to_cpu(__raw_readl(addr))#definewritel(b,addr)__raw_writel(__cpu_to_le32(b),addr) 相较于 x86,ARM 多出了带 "_relaxed" 后缀的变种函数,并且使用了 iormb 和 iowmb。relax 模式主要影响 CPU 对 normal RAM 和 MMIO 的访问顺序问题,具体请看Semantics of MMIO ...