hw/openrisc/boot.c

   1 /*
   2  * SPDX-License-Identifier: GPL-2.0-or-later
   3  *
   4  * QEMU OpenRISC boot helpers.
   5  *
   6  * (c) 2022 Stafford Horne <shorne@gmail.com>
   7  */
   8
   9 #include "qemu/osdep.h"
  10 #include "cpu.h"
  11 #include "exec/cpu-defs.h"
  12 #include "elf.h"
  13 #include "hw/loader.h"
  14 #include "hw/openrisc/boot.h"
  15 #include "sysemu/device_tree.h"
  16 #include "sysemu/qtest.h"
  17 #include "sysemu/reset.h"
  18 #include "qemu/error-report.h"
  19
  20 #include <libfdt.h>
  21
  22 #define KERNEL_LOAD_ADDR 0x100
  23
  24 hwaddr openrisc_load_kernel(ram_addr_t ram_size,
  25                             const char *kernel_filename,
  26                             uint32_t *bootstrap_pc)
  27 {
  28     long kernel_size;
  29     uint64_t elf_entry;
  30     uint64_t high_addr;
  31     hwaddr entry;
  32
  33     if (kernel_filename && !qtest_enabled()) {
  34         kernel_size = load_elf(kernel_filename, NULL, NULL, NULL,
  35                                &elf_entry, NULL, &high_addr, NULL, 1,
  36                                EM_OPENRISC, 1, 0);
  37         entry = elf_entry;
  38         if (kernel_size < 0) {
  39             kernel_size = load_uimage(kernel_filename,
  40                                       &entry, NULL, NULL, NULL, NULL);
  41             high_addr = entry + kernel_size;
  42         }
  43         if (kernel_size < 0) {
  44             kernel_size = load_image_targphys(kernel_filename,
  45                                               KERNEL_LOAD_ADDR,
  46                                               ram_size - KERNEL_LOAD_ADDR);
  47             high_addr = KERNEL_LOAD_ADDR + kernel_size;
  48         }
  49
  50         if (entry <= 0) {
  51             entry = KERNEL_LOAD_ADDR;
  52         }
  53
  54         if (kernel_size < 0) {
  55             error_report("couldn't load the kernel '%s'", kernel_filename);
  56             exit(1);
  57         }
  58         *bootstrap_pc = entry;
  59
  60         return high_addr;
  61     }
  62     return 0;
  63 }
  64
  65 hwaddr openrisc_load_initrd(void *fdt, const char *filename,
  66                             hwaddr load_start, uint64_t mem_size)
  67 {
  68     int size;
  69     hwaddr start;
  70
  71     /* We put the initrd right after the kernel; page aligned. */
  72     start = TARGET_PAGE_ALIGN(load_start);
  73
  74     size = load_ramdisk(filename, start, mem_size - start);
  75     if (size < 0) {
  76         size = load_image_targphys(filename, start, mem_size - start);
  77         if (size < 0) {
  78             error_report("could not load ramdisk '%s'", filename);
  79             exit(1);
  80         }
  81     }
  82
  83     if (fdt) {
  84         qemu_fdt_setprop_cell(fdt, "/chosen",
  85                               "linux,initrd-start", start);
  86         qemu_fdt_setprop_cell(fdt, "/chosen",
  87                               "linux,initrd-end", start + size);
  88     }
  89
  90     return start + size;
  91 }
  92
  93 uint32_t openrisc_load_fdt(void *fdt, hwaddr load_start,
  94                            uint64_t mem_size)
  95 {
  96     uint32_t fdt_addr;
  97     int ret;
  98     int fdtsize = fdt_totalsize(fdt);
  99
 100     if (fdtsize <= 0) {
 101         error_report("invalid device-tree");
 102         exit(1);
 103     }
 104
 105     /* We put fdt right after the kernel and/or initrd. */
 106     fdt_addr = TARGET_PAGE_ALIGN(load_start);
 107
 108     ret = fdt_pack(fdt);
 109     /* Should only fail if we've built a corrupted tree */
 110     g_assert(ret == 0);
 111     /* copy in the device tree */
 112     qemu_fdt_dumpdtb(fdt, fdtsize);
 113
 114     rom_add_blob_fixed_as("fdt", fdt, fdtsize, fdt_addr,
 115                           &address_space_memory);
 116     qemu_register_reset_nosnapshotload(qemu_fdt_randomize_seeds,
 117                         rom_ptr_for_as(&address_space_memory, fdt_addr, fdtsize));
 118
 119     return fdt_addr;
 120 }