Some CPUs are of an opposite data-endianness to other components in the system. Sometimes elfs have the data sections layed out with this CPU data-endianness accounting for when loaded via the CPU, so byte swaps (relative to other system components) will occur. The leading example, is ARM's BE32 mode, which is is basically LE with address manipulation on half-word and byte accesses to access the hw/byte reversed address. This means that word data is invariant across LE and BE32. This also means that instructions are still LE. The expectation is that the elf will be loaded via the CPU in this endianness scheme, which means the data in the elf is reversed at compile time. As QEMU loads via the system memory directly, rather than the CPU, we need a mechanism to reverse elf data endianness to implement this possibility. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
213 lines
7.2 KiB
C
213 lines
7.2 KiB
C
/*
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* Microblaze kernel loader
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*
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* Copyright (c) 2012 Peter Crosthwaite <peter.crosthwaite@petalogix.com>
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* Copyright (c) 2012 PetaLogix
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* Copyright (c) 2009 Edgar E. Iglesias.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu/option.h"
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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#include "qemu-common.h"
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#include "sysemu/device_tree.h"
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#include "sysemu/sysemu.h"
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#include "hw/loader.h"
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#include "elf.h"
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#include "boot.h"
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static struct
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{
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void (*machine_cpu_reset)(MicroBlazeCPU *);
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uint32_t bootstrap_pc;
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uint32_t cmdline;
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uint32_t initrd_start;
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uint32_t initrd_end;
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uint32_t fdt;
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} boot_info;
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static void main_cpu_reset(void *opaque)
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{
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MicroBlazeCPU *cpu = opaque;
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CPUState *cs = CPU(cpu);
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CPUMBState *env = &cpu->env;
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cpu_reset(cs);
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env->regs[5] = boot_info.cmdline;
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env->regs[6] = boot_info.initrd_start;
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env->regs[7] = boot_info.fdt;
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cpu_set_pc(cs, boot_info.bootstrap_pc);
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if (boot_info.machine_cpu_reset) {
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boot_info.machine_cpu_reset(cpu);
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}
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}
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static int microblaze_load_dtb(hwaddr addr,
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uint32_t ramsize,
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uint32_t initrd_start,
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uint32_t initrd_end,
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const char *kernel_cmdline,
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const char *dtb_filename)
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{
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int fdt_size;
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void *fdt = NULL;
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int r;
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if (dtb_filename) {
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fdt = load_device_tree(dtb_filename, &fdt_size);
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}
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if (!fdt) {
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return 0;
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}
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if (kernel_cmdline) {
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r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
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kernel_cmdline);
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if (r < 0) {
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fprintf(stderr, "couldn't set /chosen/bootargs\n");
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}
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}
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if (initrd_start) {
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qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
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initrd_start);
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qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
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initrd_end);
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}
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cpu_physical_memory_write(addr, fdt, fdt_size);
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return fdt_size;
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}
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static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
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{
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return addr - 0x30000000LL;
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}
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void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
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uint32_t ramsize,
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const char *initrd_filename,
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const char *dtb_filename,
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void (*machine_cpu_reset)(MicroBlazeCPU *))
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{
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QemuOpts *machine_opts;
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const char *kernel_filename;
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const char *kernel_cmdline;
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const char *dtb_arg;
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char *filename = NULL;
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machine_opts = qemu_get_machine_opts();
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kernel_filename = qemu_opt_get(machine_opts, "kernel");
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kernel_cmdline = qemu_opt_get(machine_opts, "append");
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dtb_arg = qemu_opt_get(machine_opts, "dtb");
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/* default to pcbios dtb as passed by machine_init */
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if (!dtb_arg) {
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filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
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}
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boot_info.machine_cpu_reset = machine_cpu_reset;
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qemu_register_reset(main_cpu_reset, cpu);
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if (kernel_filename) {
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int kernel_size;
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uint64_t entry, low, high;
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uint32_t base32;
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int big_endian = 0;
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#ifdef TARGET_WORDS_BIGENDIAN
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big_endian = 1;
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#endif
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/* Boots a kernel elf binary. */
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kernel_size = load_elf(kernel_filename, NULL, NULL,
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&entry, &low, &high,
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big_endian, EM_MICROBLAZE, 0, 0);
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base32 = entry;
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if (base32 == 0xc0000000) {
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kernel_size = load_elf(kernel_filename, translate_kernel_address,
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NULL, &entry, NULL, NULL,
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big_endian, EM_MICROBLAZE, 0, 0);
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}
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/* Always boot into physical ram. */
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boot_info.bootstrap_pc = (uint32_t)entry;
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/* If it wasn't an ELF image, try an u-boot image. */
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if (kernel_size < 0) {
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hwaddr uentry, loadaddr;
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kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0,
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NULL, NULL);
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boot_info.bootstrap_pc = uentry;
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high = (loadaddr + kernel_size + 3) & ~3;
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}
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/* Not an ELF image nor an u-boot image, try a RAW image. */
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if (kernel_size < 0) {
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kernel_size = load_image_targphys(kernel_filename, ddr_base,
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ram_size);
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boot_info.bootstrap_pc = ddr_base;
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high = (ddr_base + kernel_size + 3) & ~3;
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}
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if (initrd_filename) {
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int initrd_size;
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uint32_t initrd_offset;
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high = ROUND_UP(high + kernel_size, 4);
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boot_info.initrd_start = high;
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initrd_offset = boot_info.initrd_start - ddr_base;
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initrd_size = load_ramdisk(initrd_filename,
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boot_info.initrd_start,
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ram_size - initrd_offset);
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if (initrd_size < 0) {
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initrd_size = load_image_targphys(initrd_filename,
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boot_info.initrd_start,
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ram_size - initrd_offset);
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}
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if (initrd_size < 0) {
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error_report("qemu: could not load initrd '%s'",
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initrd_filename);
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exit(EXIT_FAILURE);
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}
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boot_info.initrd_end = boot_info.initrd_start + initrd_size;
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high = ROUND_UP(high + initrd_size, 4);
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}
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boot_info.cmdline = high + 4096;
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if (kernel_cmdline && strlen(kernel_cmdline)) {
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pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
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}
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/* Provide a device-tree. */
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boot_info.fdt = boot_info.cmdline + 4096;
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microblaze_load_dtb(boot_info.fdt, ram_size,
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boot_info.initrd_start,
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boot_info.initrd_end,
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kernel_cmdline,
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/* Preference a -dtb argument */
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dtb_arg ? dtb_arg : filename);
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}
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g_free(filename);
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}
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