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>
298 lines
8.6 KiB
C
298 lines
8.6 KiB
C
/*
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* bootloader support
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Christian Borntraeger <borntraeger@de.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at your
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* option) any later version. See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "sysemu/sysemu.h"
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#include "cpu.h"
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#include "elf.h"
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#include "hw/loader.h"
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#include "hw/s390x/virtio-ccw.h"
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#include "hw/s390x/css.h"
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#include "ipl.h"
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#define KERN_IMAGE_START 0x010000UL
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#define KERN_PARM_AREA 0x010480UL
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#define INITRD_START 0x800000UL
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#define INITRD_PARM_START 0x010408UL
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#define INITRD_PARM_SIZE 0x010410UL
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#define PARMFILE_START 0x001000UL
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#define ZIPL_IMAGE_START 0x009000UL
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#define IPL_PSW_MASK (PSW_MASK_32 | PSW_MASK_64)
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static const VMStateDescription vmstate_iplb = {
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.name = "ipl/iplb",
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.version_id = 0,
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.minimum_version_id = 0,
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.fields = (VMStateField[]) {
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VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110),
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VMSTATE_UINT16(devno, IplParameterBlock),
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VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_ipl = {
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.name = "ipl",
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.version_id = 0,
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.minimum_version_id = 0,
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.fields = (VMStateField[]) {
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VMSTATE_UINT64(start_addr, S390IPLState),
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VMSTATE_UINT64(bios_start_addr, S390IPLState),
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VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock),
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VMSTATE_BOOL(iplb_valid, S390IPLState),
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VMSTATE_UINT8(cssid, S390IPLState),
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VMSTATE_UINT8(ssid, S390IPLState),
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VMSTATE_UINT16(devno, S390IPLState),
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VMSTATE_END_OF_LIST()
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}
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};
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static S390IPLState *get_ipl_device(void)
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{
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return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL));
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}
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static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
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{
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uint64_t dstaddr = *(uint64_t *) opaque;
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/*
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* Assuming that our s390-ccw.img was linked for starting at address 0,
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* we can simply add the destination address for the final location
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*/
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return srcaddr + dstaddr;
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}
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static void s390_ipl_realize(DeviceState *dev, Error **errp)
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{
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S390IPLState *ipl = S390_IPL(dev);
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uint64_t pentry = KERN_IMAGE_START;
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int kernel_size;
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Error *err = NULL;
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int bios_size;
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char *bios_filename;
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/*
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* Always load the bios if it was enforced,
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* even if an external kernel has been defined.
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*/
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if (!ipl->kernel || ipl->enforce_bios) {
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uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL;
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if (bios_name == NULL) {
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bios_name = ipl->firmware;
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}
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bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
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if (bios_filename == NULL) {
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error_setg(&err, "could not find stage1 bootloader");
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goto error;
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}
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bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase,
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&ipl->bios_start_addr, NULL, NULL, 1,
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EM_S390, 0, 0);
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if (bios_size > 0) {
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/* Adjust ELF start address to final location */
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ipl->bios_start_addr += fwbase;
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} else {
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/* Try to load non-ELF file (e.g. s390-ccw.img) */
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bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
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4096);
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ipl->bios_start_addr = ZIPL_IMAGE_START;
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}
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g_free(bios_filename);
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if (bios_size == -1) {
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error_setg(&err, "could not load bootloader '%s'", bios_name);
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goto error;
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}
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/* default boot target is the bios */
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ipl->start_addr = ipl->bios_start_addr;
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}
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if (ipl->kernel) {
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kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
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NULL, 1, EM_S390, 0, 0);
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if (kernel_size < 0) {
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kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
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}
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if (kernel_size < 0) {
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error_setg(&err, "could not load kernel '%s'", ipl->kernel);
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goto error;
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}
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/*
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* Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
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* kernel parameters here as well. Note: For old kernels (up to 3.2)
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* we can not rely on the ELF entry point - it was 0x800 (the SALIPL
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* loader) and it won't work. For this case we force it to 0x10000, too.
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*/
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if (pentry == KERN_IMAGE_START || pentry == 0x800) {
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ipl->start_addr = KERN_IMAGE_START;
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/* Overwrite parameters in the kernel image, which are "rom" */
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strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
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} else {
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ipl->start_addr = pentry;
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}
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if (ipl->initrd) {
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ram_addr_t initrd_offset;
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int initrd_size;
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initrd_offset = INITRD_START;
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while (kernel_size + 0x100000 > initrd_offset) {
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initrd_offset += 0x100000;
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}
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initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
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ram_size - initrd_offset);
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if (initrd_size == -1) {
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error_setg(&err, "could not load initrd '%s'", ipl->initrd);
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goto error;
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}
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/*
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* we have to overwrite values in the kernel image,
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* which are "rom"
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*/
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stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
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stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
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}
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}
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qemu_register_reset(qdev_reset_all_fn, dev);
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error:
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error_propagate(errp, err);
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}
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static Property s390_ipl_properties[] = {
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DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
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DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
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DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
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DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
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DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
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DEFINE_PROP_END_OF_LIST(),
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};
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/*
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* In addition to updating the iplstate, this function returns:
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* - 0 if system was ipled with external kernel
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* - -1 if no valid boot device was found
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* - ccw id of the boot device otherwise
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*/
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static uint64_t s390_update_iplstate(S390IPLState *ipl)
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{
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DeviceState *dev_st;
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if (ipl->iplb_valid) {
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ipl->cssid = 0;
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ipl->ssid = 0;
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ipl->devno = ipl->iplb.devno;
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goto out;
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}
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if (ipl->kernel) {
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return 0;
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}
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dev_st = get_boot_device(0);
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if (dev_st) {
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VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
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OBJECT(qdev_get_parent_bus(dev_st)->parent),
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TYPE_VIRTIO_CCW_DEVICE);
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if (ccw_dev) {
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ipl->cssid = ccw_dev->sch->cssid;
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ipl->ssid = ccw_dev->sch->ssid;
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ipl->devno = ccw_dev->sch->devno;
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goto out;
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}
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}
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return -1;
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out:
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return (uint32_t) (ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno);
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}
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void s390_ipl_update_diag308(IplParameterBlock *iplb)
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{
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S390IPLState *ipl = get_ipl_device();
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ipl->iplb = *iplb;
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ipl->iplb_valid = true;
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}
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IplParameterBlock *s390_ipl_get_iplb(void)
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{
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S390IPLState *ipl = get_ipl_device();
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if (!ipl->iplb_valid) {
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return NULL;
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}
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return &ipl->iplb;
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}
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void s390_reipl_request(void)
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{
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S390IPLState *ipl = get_ipl_device();
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ipl->reipl_requested = true;
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qemu_system_reset_request();
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}
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void s390_ipl_prepare_cpu(S390CPU *cpu)
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{
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S390IPLState *ipl = get_ipl_device();
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cpu->env.psw.addr = ipl->start_addr;
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cpu->env.psw.mask = IPL_PSW_MASK;
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if (!ipl->kernel || ipl->iplb_valid) {
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cpu->env.psw.addr = ipl->bios_start_addr;
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cpu->env.regs[7] = s390_update_iplstate(ipl);
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}
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}
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static void s390_ipl_reset(DeviceState *dev)
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{
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S390IPLState *ipl = S390_IPL(dev);
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if (!ipl->reipl_requested) {
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ipl->iplb_valid = false;
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}
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ipl->reipl_requested = false;
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}
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static void s390_ipl_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = s390_ipl_realize;
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dc->props = s390_ipl_properties;
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dc->reset = s390_ipl_reset;
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dc->vmsd = &vmstate_ipl;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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}
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static const TypeInfo s390_ipl_info = {
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.class_init = s390_ipl_class_init,
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.parent = TYPE_DEVICE,
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.name = TYPE_S390_IPL,
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.instance_size = sizeof(S390IPLState),
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};
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static void s390_ipl_register_types(void)
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{
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type_register_static(&s390_ipl_info);
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}
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type_init(s390_ipl_register_types)
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