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-rw-r--r--hw/microblaze/boot.c177
1 files changed, 177 insertions, 0 deletions
diff --git a/hw/microblaze/boot.c b/hw/microblaze/boot.c
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+++ b/hw/microblaze/boot.c
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+/*
+ * Microblaze kernel loader
+ *
+ * Copyright (c) 2012 Peter Crosthwaite <peter.crosthwaite@petalogix.com>
+ * Copyright (c) 2012 PetaLogix
+ * Copyright (c) 2009 Edgar E. Iglesias.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/option.h"
+#include "qemu/config-file.h"
+#include "qemu-common.h"
+#include "sysemu/device_tree.h"
+#include "hw/loader.h"
+#include "elf.h"
+
+#include "hw/microblaze_boot.h"
+
+static struct
+{
+ void (*machine_cpu_reset)(MicroBlazeCPU *);
+ uint32_t bootstrap_pc;
+ uint32_t cmdline;
+ uint32_t fdt;
+} boot_info;
+
+static void main_cpu_reset(void *opaque)
+{
+ MicroBlazeCPU *cpu = opaque;
+ CPUMBState *env = &cpu->env;
+
+ cpu_reset(CPU(cpu));
+ env->regs[5] = boot_info.cmdline;
+ env->regs[7] = boot_info.fdt;
+ env->sregs[SR_PC] = boot_info.bootstrap_pc;
+ if (boot_info.machine_cpu_reset) {
+ boot_info.machine_cpu_reset(cpu);
+ }
+}
+
+static int microblaze_load_dtb(hwaddr addr,
+ uint32_t ramsize,
+ const char *kernel_cmdline,
+ const char *dtb_filename)
+{
+ int fdt_size;
+#ifdef CONFIG_FDT
+ void *fdt = NULL;
+ int r;
+
+ if (dtb_filename) {
+ fdt = load_device_tree(dtb_filename, &fdt_size);
+ }
+ if (!fdt) {
+ return 0;
+ }
+
+ if (kernel_cmdline) {
+ r = qemu_devtree_setprop_string(fdt, "/chosen", "bootargs",
+ kernel_cmdline);
+ if (r < 0) {
+ fprintf(stderr, "couldn't set /chosen/bootargs\n");
+ }
+ }
+
+ cpu_physical_memory_write(addr, (void *)fdt, fdt_size);
+#else
+ /* We lack libfdt so we cannot manipulate the fdt. Just pass on the blob
+ to the kernel. */
+ if (dtb_filename) {
+ fdt_size = load_image_targphys(dtb_filename, addr, 0x10000);
+ }
+ if (kernel_cmdline) {
+ fprintf(stderr,
+ "Warning: missing libfdt, cannot pass cmdline to kernel!\n");
+ }
+#endif
+ return fdt_size;
+}
+
+static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
+{
+ return addr - 0x30000000LL;
+}
+
+void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
+ uint32_t ramsize, const char *dtb_filename,
+ void (*machine_cpu_reset)(MicroBlazeCPU *))
+{
+ QemuOpts *machine_opts;
+ const char *kernel_filename = NULL;
+ const char *kernel_cmdline = NULL;
+
+ machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
+ if (machine_opts) {
+ const char *dtb_arg;
+ kernel_filename = qemu_opt_get(machine_opts, "kernel");
+ kernel_cmdline = qemu_opt_get(machine_opts, "append");
+ dtb_arg = qemu_opt_get(machine_opts, "dtb");
+ if (dtb_arg) { /* Preference a -dtb argument */
+ dtb_filename = dtb_arg;
+ } else { /* default to pcbios dtb as passed by machine_init */
+ dtb_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
+ }
+ }
+
+ boot_info.machine_cpu_reset = machine_cpu_reset;
+ qemu_register_reset(main_cpu_reset, cpu);
+
+ if (kernel_filename) {
+ int kernel_size;
+ uint64_t entry, low, high;
+ uint32_t base32;
+ int big_endian = 0;
+
+#ifdef TARGET_WORDS_BIGENDIAN
+ big_endian = 1;
+#endif
+
+ /* Boots a kernel elf binary. */
+ kernel_size = load_elf(kernel_filename, NULL, NULL,
+ &entry, &low, &high,
+ big_endian, ELF_MACHINE, 0);
+ base32 = entry;
+ if (base32 == 0xc0000000) {
+ kernel_size = load_elf(kernel_filename, translate_kernel_address,
+ NULL, &entry, NULL, NULL,
+ big_endian, ELF_MACHINE, 0);
+ }
+ /* Always boot into physical ram. */
+ boot_info.bootstrap_pc = ddr_base + (entry & 0x0fffffff);
+
+ /* If it wasn't an ELF image, try an u-boot image. */
+ if (kernel_size < 0) {
+ hwaddr uentry, loadaddr;
+
+ kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0);
+ boot_info.bootstrap_pc = uentry;
+ high = (loadaddr + kernel_size + 3) & ~3;
+ }
+
+ /* Not an ELF image nor an u-boot image, try a RAW image. */
+ if (kernel_size < 0) {
+ kernel_size = load_image_targphys(kernel_filename, ddr_base,
+ ram_size);
+ boot_info.bootstrap_pc = ddr_base;
+ high = (ddr_base + kernel_size + 3) & ~3;
+ }
+
+ boot_info.cmdline = high + 4096;
+ if (kernel_cmdline && strlen(kernel_cmdline)) {
+ pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
+ }
+ /* Provide a device-tree. */
+ boot_info.fdt = boot_info.cmdline + 4096;
+ microblaze_load_dtb(boot_info.fdt, ram_size, kernel_cmdline,
+ dtb_filename);
+ }
+
+}
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