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-rw-r--r--lib/hurd.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/lib/hurd.c b/lib/hurd.c
new file mode 100644
index 0000000..c5a381e
--- /dev/null
+++ b/lib/hurd.c
@@ -0,0 +1,369 @@
+/*
+ * The PCI Library -- Hurd access via RPCs
+ *
+ * Copyright (c) 2017 Joan Lledó <jlledom@member.fsf.org>
+ *
+ * Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#define _GNU_SOURCE
+
+#include "internal.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <string.h>
+#include <hurd.h>
+#include <hurd/pci.h>
+#include <hurd/paths.h>
+
+/* Server path */
+#define _SERVERS_BUS_PCI _SERVERS_BUS "/pci"
+
+/* File names */
+#define FILE_CONFIG_NAME "config"
+#define FILE_ROM_NAME "rom"
+
+/* Level in the fs tree */
+typedef enum
+{
+ LEVEL_NONE,
+ LEVEL_DOMAIN,
+ LEVEL_BUS,
+ LEVEL_DEV,
+ LEVEL_FUNC
+} tree_level;
+
+/* Check whether there's a pci server */
+static int
+hurd_detect(struct pci_access *a)
+{
+ int err;
+ struct stat st;
+
+ err = stat(_SERVERS_BUS_PCI, &st);
+ if (err)
+ {
+ a->error("Could not open file `%s'", _SERVERS_BUS_PCI);
+ return 0;
+ }
+
+ /* The node must be a directory and a translator */
+ return S_ISDIR(st.st_mode) && ((st.st_mode & S_ITRANS) == S_IROOT);
+}
+
+/* Empty callbacks, we don't need any special init or cleanup */
+static void
+hurd_init(struct pci_access *a UNUSED)
+{
+}
+
+static void
+hurd_cleanup(struct pci_access *a UNUSED)
+{
+}
+
+/* Each device has its own server path. Allocate space for the port. */
+static void
+hurd_init_dev(struct pci_dev *d)
+{
+ d->aux = pci_malloc(d->access, sizeof(mach_port_t));
+ *((mach_port_t *) d->aux) = MACH_PORT_NULL;
+}
+
+/* Deallocate the port and free its space */
+static void
+hurd_cleanup_dev(struct pci_dev *d)
+{
+ mach_port_t device_port;
+
+ device_port = *((mach_port_t *) d->aux);
+ mach_port_deallocate(mach_task_self(), device_port);
+
+ pci_mfree(d->aux);
+}
+
+static mach_port_t
+device_port_lookup(struct pci_dev *d)
+{
+ char server[NAME_MAX];
+ mach_port_t device_port = *((mach_port_t *) d->aux);
+
+ if (device_port != MACH_PORT_NULL)
+ return device_port;
+
+ snprintf(server, NAME_MAX, "%s/%04x/%02x/%02x/%01u/%s",
+ _SERVERS_BUS_PCI, d->domain, d->bus, d->dev, d->func,
+ FILE_CONFIG_NAME);
+ device_port = file_name_lookup(server, 0, 0);
+
+ if (device_port == MACH_PORT_NULL)
+ d->access->error("Cannot find the PCI arbiter");
+
+ *((mach_port_t *) d->aux) = device_port;
+ return device_port;
+}
+
+/* Walk through the FS tree to see what is allowed for us */
+static void
+enum_devices(const char *parent, struct pci_access *a, int domain, int bus,
+ int dev, int func, tree_level lev)
+{
+ int ret;
+ DIR *dir;
+ struct dirent *entry;
+ char path[NAME_MAX];
+ struct pci_dev *d;
+
+ dir = opendir(parent);
+ if (!dir)
+ {
+ if (errno == EPERM || errno == EACCES)
+ /* The client lacks the permissions to access this function, skip */
+ return;
+ else
+ a->error("Cannot open directory: %s (%s)", parent, strerror(errno));
+ }
+
+ while ((entry = readdir(dir)) != 0)
+ {
+ snprintf(path, NAME_MAX, "%s/%s", parent, entry->d_name);
+ if (entry->d_type == DT_DIR)
+ {
+ if (!strncmp(entry->d_name, ".", NAME_MAX)
+ || !strncmp(entry->d_name, "..", NAME_MAX))
+ continue;
+
+ errno = 0;
+ ret = strtol(entry->d_name, 0, 16);
+ if (errno)
+ {
+ if (closedir(dir) < 0)
+ a->warning("Cannot close directory: %s (%s)", parent,
+ strerror(errno));
+ a->error("Wrong directory name: %s (number expected) probably "
+ "not connected to an arbiter", entry->d_name);
+ }
+
+ /*
+ * We found a valid directory.
+ * Update the address and switch to the next level.
+ */
+ switch (lev)
+ {
+ case LEVEL_DOMAIN:
+ domain = ret;
+ break;
+ case LEVEL_BUS:
+ bus = ret;
+ break;
+ case LEVEL_DEV:
+ dev = ret;
+ break;
+ case LEVEL_FUNC:
+ func = ret;
+ break;
+ default:
+ if (closedir(dir) < 0)
+ a->warning("Cannot close directory: %s (%s)", parent,
+ strerror(errno));
+ a->error("Wrong directory tree, probably not connected to an arbiter");
+ }
+
+ enum_devices(path, a, domain, bus, dev, func, lev + 1);
+ }
+ else
+ {
+ if (strncmp(entry->d_name, FILE_CONFIG_NAME, NAME_MAX))
+ /* We are looking for the config file */
+ continue;
+
+ /* We found an available virtual device, add it to our list */
+ d = pci_alloc_dev(a);
+ d->domain = domain;
+ d->bus = bus;
+ d->dev = dev;
+ d->func = func;
+ pci_link_dev(a, d);
+ }
+ }
+
+ if (closedir(dir) < 0)
+ a->error("Cannot close directory: %s (%s)", parent, strerror(errno));
+}
+
+/* Enumerate devices */
+static void
+hurd_scan(struct pci_access *a)
+{
+ enum_devices(_SERVERS_BUS_PCI, a, -1, -1, -1, -1, LEVEL_DOMAIN);
+}
+
+/*
+ * Read `len' bytes to `buf'.
+ *
+ * Returns error when the number of read bytes does not match `len'.
+ */
+static int
+hurd_read(struct pci_dev *d, int pos, byte * buf, int len)
+{
+ int err;
+ size_t nread;
+ char *data;
+ mach_port_t device_port = device_port_lookup(d);
+
+ if (len > 4)
+ return pci_generic_block_read(d, pos, buf, len);
+
+ data = (char *) buf;
+ err = pci_conf_read(device_port, pos, &data, &nread, len);
+
+ if (data != (char *) buf)
+ {
+ if (nread > (size_t) len) /* Sanity check for bogus server. */
+ {
+ vm_deallocate(mach_task_self(), (vm_address_t) data, nread);
+ return 0;
+ }
+
+ memcpy(buf, data, nread);
+ vm_deallocate(mach_task_self(), (vm_address_t) data, nread);
+ }
+
+ return !err && nread == (size_t) len;
+}
+
+/*
+ * Write `len' bytes from `buf'.
+ *
+ * Returns error when the number of written bytes does not match `len'.
+ */
+static int
+hurd_write(struct pci_dev *d, int pos, byte * buf, int len)
+{
+ int err;
+ size_t nwrote;
+ mach_port_t device_port = device_port_lookup(d);
+
+ if (len > 4)
+ return pci_generic_block_write(d, pos, buf, len);
+
+ err = pci_conf_write(device_port, pos, (char *) buf, len, &nwrote);
+
+ return !err && nwrote == (size_t) len;
+}
+
+/* Get requested info from the server */
+
+static int
+hurd_fill_regions(struct pci_dev *d)
+{
+ mach_port_t device_port = device_port_lookup(d);
+ struct pci_bar regions[6];
+ char *buf = (char *) &regions;
+ size_t size = sizeof(regions);
+
+ int err = pci_get_dev_regions(device_port, &buf, &size);
+ if (err)
+ return 0;
+
+ if ((char *) &regions != buf)
+ {
+ /* Sanity check for bogus server. */
+ if (size > sizeof(regions))
+ {
+ vm_deallocate(mach_task_self(), (vm_address_t) buf, size);
+ return 0;
+ }
+
+ memcpy(&regions, buf, size);
+ vm_deallocate(mach_task_self(), (vm_address_t) buf, size);
+ }
+
+ for (int i = 0; i < 6; i++)
+ {
+ if (regions[i].size == 0)
+ continue;
+
+ d->base_addr[i] = regions[i].base_addr;
+ d->base_addr[i] |= regions[i].is_IO;
+ d->base_addr[i] |= regions[i].is_64 << 2;
+ d->base_addr[i] |= regions[i].is_prefetchable << 3;
+
+ d->size[i] = regions[i].size;
+ }
+
+ return 1;
+}
+
+static int
+hurd_fill_rom(struct pci_dev *d)
+{
+ struct pci_xrom_bar rom;
+ mach_port_t device_port = device_port_lookup(d);
+ char *buf = (char *) &rom;
+ size_t size = sizeof(rom);
+
+ int err = pci_get_dev_rom(device_port, &buf, &size);
+ if (err)
+ return 0;
+
+ if ((char *) &rom != buf)
+ {
+ /* Sanity check for bogus server. */
+ if (size > sizeof(rom))
+ {
+ vm_deallocate(mach_task_self(), (vm_address_t) buf, size);
+ return 0;
+ }
+
+ memcpy(&rom, buf, size);
+ vm_deallocate(mach_task_self(), (vm_address_t) buf, size);
+ }
+
+ d->rom_base_addr = rom.base_addr;
+ d->rom_size = rom.size;
+
+ return 1;
+}
+
+static void
+hurd_fill_info(struct pci_dev *d, unsigned int flags)
+{
+ if (!d->access->buscentric)
+ {
+ if (want_fill(d, flags, PCI_FILL_BASES | PCI_FILL_SIZES))
+ {
+ if (hurd_fill_regions(d))
+ clear_fill(d, PCI_FILL_BASES | PCI_FILL_SIZES);
+ }
+ if (want_fill(d, flags, PCI_FILL_ROM_BASE))
+ {
+ if (hurd_fill_rom(d))
+ clear_fill(d, PCI_FILL_ROM_BASE);
+ }
+ }
+
+ pci_generic_fill_info(d, flags);
+}
+
+struct pci_methods pm_hurd = {
+ "hurd",
+ "Hurd access using RPCs",
+ NULL, /* config */
+ hurd_detect,
+ hurd_init,
+ hurd_cleanup,
+ hurd_scan,
+ hurd_fill_info,
+ hurd_read,
+ hurd_write,
+ NULL, /* read_vpd */
+ hurd_init_dev,
+ hurd_cleanup_dev
+};
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