1 /* 2 * QEMU Alpha PCI support functions. 3 * 4 * Some of this isn't very Alpha specific at all. 5 * 6 * ??? Sparse memory access not implemented. 7 */ 8 9 #include "qemu/osdep.h" 10 #include "alpha_sys.h" 11 #include "qemu/log.h" 12 #include "sysemu/sysemu.h" 13 #include "trace.h" 14 15 16 /* Fallback for unassigned PCI I/O operations. Avoids MCHK. */ 17 18 static uint64_t ignore_read(void *opaque, hwaddr addr, unsigned size) 19 { 20 return 0; 21 } 22 23 static void ignore_write(void *opaque, hwaddr addr, uint64_t v, unsigned size) 24 { 25 } 26 27 const MemoryRegionOps alpha_pci_ignore_ops = { 28 .read = ignore_read, 29 .write = ignore_write, 30 .endianness = DEVICE_LITTLE_ENDIAN, 31 .valid = { 32 .min_access_size = 1, 33 .max_access_size = 8, 34 }, 35 .impl = { 36 .min_access_size = 1, 37 .max_access_size = 8, 38 }, 39 }; 40 41 42 /* PCI config space reads/writes, to byte-word addressable memory. */ 43 static uint64_t bw_conf1_read(void *opaque, hwaddr addr, 44 unsigned size) 45 { 46 PCIBus *b = opaque; 47 return pci_data_read(b, addr, size); 48 } 49 50 static void bw_conf1_write(void *opaque, hwaddr addr, 51 uint64_t val, unsigned size) 52 { 53 PCIBus *b = opaque; 54 pci_data_write(b, addr, val, size); 55 } 56 57 const MemoryRegionOps alpha_pci_conf1_ops = { 58 .read = bw_conf1_read, 59 .write = bw_conf1_write, 60 .endianness = DEVICE_LITTLE_ENDIAN, 61 .impl = { 62 .min_access_size = 1, 63 .max_access_size = 4, 64 }, 65 }; 66 67 /* PCI/EISA Interrupt Acknowledge Cycle. */ 68 69 static uint64_t iack_read(void *opaque, hwaddr addr, unsigned size) 70 { 71 return pic_read_irq(isa_pic); 72 } 73 74 static void special_write(void *opaque, hwaddr addr, 75 uint64_t val, unsigned size) 76 { 77 trace_alpha_pci_iack_write(); 78 } 79 80 const MemoryRegionOps alpha_pci_iack_ops = { 81 .read = iack_read, 82 .write = special_write, 83 .endianness = DEVICE_LITTLE_ENDIAN, 84 .valid = { 85 .min_access_size = 4, 86 .max_access_size = 4, 87 }, 88 .impl = { 89 .min_access_size = 4, 90 .max_access_size = 4, 91 }, 92 }; 93