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https://github.com/SmallPond/MIT6.828_OS.git
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60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#include <kern/e1000.h>
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#include <kern/pmap.h>
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#include <kern/pci.h>
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#include <kern/pcireg.h>
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#include <inc/string.h>
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// LAB 6: Your driver code here
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#define E1000_LOCATE(offset) (offset >> 2)
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volatile uint32_t *e1000;
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/* 为描述符列表分配静态内存 */
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struct E1000TxDesc tx_desc_list[TX_DESC_SIZE];
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struct Packet pack_buf[TX_DESC_SIZE];
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void
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e1000_transmit_init()
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{
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size_t i;
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memset(tx_desc_list, 0 , sizeof(struct E1000TxDesc) * TX_DESC_SIZE);
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for (i = 0; i < TX_DESC_SIZE; i++) {
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tx_desc_list[i].buffer_addr = PADDR(&pack_buf[i]);
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tx_desc_list[i].status |= E1000_TXD_STAT_DD;
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tx_desc_list[i].cmd |= E1000_TXD_CMD_RS;
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}
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e1000[E1000_LOCATE(E1000_TDBAL)] = PADDR(tx_desc_list);
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e1000[E1000_LOCATE(E1000_TDBAH)] = 0;
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e1000[E1000_LOCATE(E1000_TDLEN)] = sizeof(struct E1000TxDesc) * TX_DESC_SIZE;
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// ensure that TDH and TDT are 0
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e1000[E1000_LOCATE(E1000_TDH)] = 0;
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e1000[E1000_LOCATE(E1000_TDT)] = 0;
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// Initialize the Transmit Control Register (TCTL)
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e1000[E1000_LOCATE(E1000_TCTL)] |= E1000_TCTL_EN;
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e1000[E1000_LOCATE(E1000_TCTL)] |= E1000_TCTL_PSP;
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e1000[E1000_LOCATE(E1000_TCTL)] |= (E1000_TCTL_CT & (0x10 << 4));
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e1000[E1000_LOCATE(E1000_TCTL)] |= (E1000_TCTL_CT & (0x40 << 12));
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e1000[E1000_LOCATE(E1000_TIPG)] = 10 | (8 << 10) | (6 << 20);
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}
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int
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pci_e1000_attach(struct pci_func * pcif)
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{
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int r;
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// 使能E1000，分配 MMIO等
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pci_func_enable(pcif);
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// 映射，并保存其虚拟地址，方便访问。
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e1000 = mmio_map_region(pcif->reg_base[0], pcif->reg_size[0]);
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e1000_transmit_init();
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cprintf("device status:[%08x]\n", e1000[E1000_LOCATE(E1000_DEVICE_STATUS)]);
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return 0;
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}
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