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