qemu

FORK: QEMU emulator
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xen_pt_load_rom.c (2882B)

      1 /*
      2  * This is splited from hw/i386/kvm/pci-assign.c
      3  */
      4 #include "qemu/osdep.h"
      5 #include "qapi/error.h"
      6 #include "qemu/error-report.h"
      7 #include "hw/loader.h"
      8 #include "hw/pci/pci.h"
      9 #include "xen_pt.h"
     10 
     11 /*
     12  * Scan the assigned devices for the devices that have an option ROM, and then
     13  * load the corresponding ROM data to RAM. If an error occurs while loading an
     14  * option ROM, we just ignore that option ROM and continue with the next one.
     15  */
     16 void *pci_assign_dev_load_option_rom(PCIDevice *dev,
     17                                      int *size, unsigned int domain,
     18                                      unsigned int bus, unsigned int slot,
     19                                      unsigned int function)
     20 {
     21     char name[32], rom_file[64];
     22     FILE *fp;
     23     uint8_t val;
     24     struct stat st;
     25     void *ptr = NULL;
     26     Object *owner = OBJECT(dev);
     27 
     28     /* If loading ROM from file, pci handles it */
     29     if (dev->romfile || !dev->rom_bar) {
     30         return NULL;
     31     }
     32 
     33     snprintf(rom_file, sizeof(rom_file),
     34              "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom",
     35              domain, bus, slot, function);
     36 
     37     /* Write "1" to the ROM file to enable it */
     38     fp = fopen(rom_file, "r+");
     39     if (fp == NULL) {
     40         if (errno != ENOENT) {
     41             error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno));
     42         }
     43         return NULL;
     44     }
     45     if (fstat(fileno(fp), &st) == -1) {
     46         error_report("pci-assign: Cannot stat %s: %s", rom_file, strerror(errno));
     47         goto close_rom;
     48     }
     49 
     50     val = 1;
     51     if (fwrite(&val, 1, 1, fp) != 1) {
     52         goto close_rom;
     53     }
     54     fseek(fp, 0, SEEK_SET);
     55 
     56     if (dev->romsize != -1) {
     57         if (st.st_size > dev->romsize) {
     58             error_report("ROM BAR \"%s\" (%ld bytes) is too large for ROM size %u",
     59                          rom_file, (long) st.st_size, dev->romsize);
     60             goto close_rom;
     61         }
     62     } else {
     63         dev->romsize = st.st_size;
     64     }
     65 
     66     snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner));
     67     memory_region_init_ram(&dev->rom, owner, name, dev->romsize, &error_abort);
     68     ptr = memory_region_get_ram_ptr(&dev->rom);
     69     memset(ptr, 0xff, dev->romsize);
     70 
     71     if (!fread(ptr, 1, st.st_size, fp)) {
     72         error_report("pci-assign: Cannot read from host %s", rom_file);
     73         error_printf("Device option ROM contents are probably invalid "
     74                      "(check dmesg).\nSkip option ROM probe with rombar=0, "
     75                      "or load from file with romfile=\n");
     76         goto close_rom;
     77     }
     78 
     79     pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom);
     80     dev->has_rom = true;
     81     *size = st.st_size;
     82 close_rom:
     83     /* Write "0" to disable ROM */
     84     fseek(fp, 0, SEEK_SET);
     85     val = 0;
     86     if (!fwrite(&val, 1, 1, fp)) {
     87         XEN_PT_WARN(dev, "%s\n", "Failed to disable pci-sysfs rom file");
     88     }
     89     fclose(fp);
     90 
     91     return ptr;
     92 }