diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 42995e6..041f6f1 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2,6 +2,8 @@
* QEMU PCI bus manager
*
* Copyright (c) 2004 Fabrice Bellard
+ * Temporarily extended to provide host config read/write.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@@ -37,9 +39,9 @@
#include "exec/address-spaces.h"
#include "hw/hotplug.h"
-//#define DEBUG_PCI
+/* #define DEBUG_PCI */
#ifdef DEBUG_PCI
-# define PCI_DPRINTF(format, ...) printf(format, ## __VA_ARGS__)
+# define PCI_DPRINTF(format, ...) printf("pci:" format, ## __VA_ARGS__)
#else
# define PCI_DPRINTF(format, ...) do { } while (0)
#endif
@@ -60,6 +62,81 @@ static Property pci_props[] = {
DEFINE_PROP_END_OF_LIST()
};
+/* Provides config reads from the host */
+uint32_t host_pci_read_config(int bus, int slot, int fn, uint32_t address, int len)
+{
+ uint32_t val = 0;
+ int fd;
+ int domain = 0;
+ ssize_t ret;
+ char dir[128], name[128];
+
+ snprintf(dir, sizeof(dir), "/sys/bus/pci/devices/%04x:%02x:%02x.%x/",
+ domain, bus, slot, fn);
+ snprintf(name, sizeof(name), "%sconfig", dir);
+
+ fd = open(name, O_RDONLY);
+
+ if (fd >= 0)
+ {
+ do
+ {
+ ret = pread(fd,&val,len,address);
+ } while ((ret < 0) && (errno == EINTR || errno == EAGAIN));
+
+ if (ret != len)
+ {
+ PCI_DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, len=0x%x) %s ret=%zd error=%d\n",
+ __func__, 0000, bus, slot, fn, address, len, "pread Failed",ret,errno);
+ val = (1UL << (len * 8)) - 1;
+ }
+ }
+ else
+ {
+ PCI_DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, len=0x%x) %s\n",
+ __func__, 0000, bus, slot, fn, address, len, "Open Failed");
+ }
+
+ PCI_DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, len=0x%x) %x\n",
+ __func__, 0000, bus, slot, fn, address, len, val);
+ return val;
+}
+
+/* Provides config writes to the host*/
+void host_pci_write_config(int bus, int slot, int fn, uint32_t address, int len, uint32_t val)
+{
+ int fd;
+ int domain = 0;
+ ssize_t ret;
+ char dir[128], name[128];
+
+ snprintf(dir, sizeof(dir), "/sys/bus/pci/devices/%04x:%02x:%02x.%x/",
+ domain, bus, slot, fn);
+ snprintf(name, sizeof(name), "%sconfig", dir);
+
+ fd = open(name, O_RDWR);
+
+ if (fd >= 0)
+ {
+ do
+ {
+ ret = pwrite(fd,&val,len,address);
+ } while ((ret < 0) && (errno == EINTR || errno == EAGAIN));
+
+
+ if (ret != len)
+ {
+ PCI_DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, len=0x%x) %x %s ret=%zd error=%d\n",
+ __func__, 0000, bus, slot, fn, address, len, val, "pread Failed",ret,errno);
+ }
+ }
+ else
+ {
+ PCI_DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, len=0x%x) %s\n",
+ __func__, 0000, bus, slot, fn, address, len, "Open Failed");
+ }
+}
+
static const VMStateDescription vmstate_pcibus = {
.name = "PCIBUS",
.version_id = 1,