hw/pci_host.h

   1 /*
   2  * QEMU Common PCI Host bridge configuration data space access routines.
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /* Worker routines for a PCI host controller that uses an {address,data}
  26    register pair to access PCI configuration space.  */
  27
  28 typedef struct {
  29     uint32_t config_reg;
  30     PCIBus *bus;
  31 } PCIHostState;
  32
  33 static void pci_host_data_writeb(void* opaque, pci_addr_t addr, uint32_t val)
  34 {
  35     PCIHostState *s = opaque;
  36     if (s->config_reg & (1u << 31))
  37         pci_data_write(s->bus, s->config_reg | (addr & 3), val, 1);
  38 }
  39
  40 static void pci_host_data_writew(void* opaque, pci_addr_t addr, uint32_t val)
  41 {
  42     PCIHostState *s = opaque;
  43 #ifdef TARGET_WORDS_BIGENDIAN
  44     val = bswap16(val);
  45 #endif
  46     if (s->config_reg & (1u << 31))
  47         pci_data_write(s->bus, s->config_reg | (addr & 3), val, 2);
  48 }
  49
  50 static void pci_host_data_writel(void* opaque, pci_addr_t addr, uint32_t val)
  51 {
  52     PCIHostState *s = opaque;
  53 #ifdef TARGET_WORDS_BIGENDIAN
  54     val = bswap32(val);
  55 #endif
  56     if (s->config_reg & (1u << 31))
  57         pci_data_write(s->bus, s->config_reg, val, 4);
  58 }
  59
  60 static uint32_t pci_host_data_readb(void* opaque, pci_addr_t addr)
  61 {
  62     PCIHostState *s = opaque;
  63     if (!(s->config_reg & (1 << 31)))
  64         return 0xff;
  65     return pci_data_read(s->bus, s->config_reg | (addr & 3), 1);
  66 }
  67
  68 static uint32_t pci_host_data_readw(void* opaque, pci_addr_t addr)
  69 {
  70     PCIHostState *s = opaque;
  71     uint32_t val;
  72     if (!(s->config_reg & (1 << 31)))
  73         return 0xffff;
  74     val = pci_data_read(s->bus, s->config_reg | (addr & 3), 2);
  75 #ifdef TARGET_WORDS_BIGENDIAN
  76     val = bswap16(val);
  77 #endif
  78     return val;
  79 }
  80
  81 static uint32_t pci_host_data_readl(void* opaque, pci_addr_t addr)
  82 {
  83     PCIHostState *s = opaque;
  84     uint32_t val;
  85     if (!(s->config_reg & (1 << 31)))
  86         return 0xffffffff;
  87     val = pci_data_read(s->bus, s->config_reg | (addr & 3), 4);
  88 #ifdef TARGET_WORDS_BIGENDIAN
  89     val = bswap32(val);
  90 #endif
  91     return val;
  92 }
  93