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s390x/ipl: Try to detect Linux vs non Linux for initial IPL PSW

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Right now the IPL device always starts from address 0x10000 (the usual
Linux entry point). To run other guests (e.g. test programs) it is
useful to use the IPL PSW from address 0. We can use the Linux magic
at 0x10008 to decide.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <20180612125933.262679-1-borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Christian Borntraeger 2018-06-12 14:59:33 +02:00 committed by Cornelia Huck
parent ea2dd691e2
commit acd7ef837d
1 changed files with 22 additions and 5 deletions
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27
hw/s390x/ipl.c
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@ -29,6 +29,7 @@
#include "exec/exec-all.h"
#define KERN_IMAGE_START 0x010000UL
#define LINUX_MAGIC_ADDR 0x010008UL
#define KERN_PARM_AREA 0x010480UL
#define INITRD_START 0x800000UL
#define INITRD_PARM_START 0x010408UL
@ -105,7 +106,9 @@ static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
static void s390_ipl_realize(DeviceState *dev, Error **errp)
{
S390IPLState *ipl = S390_IPL(dev);
uint64_t pentry = KERN_IMAGE_START;
uint32_t *ipl_psw;
uint64_t pentry;
char *magic;
int kernel_size;
Error *err = NULL;
@ -157,10 +160,24 @@ static void s390_ipl_realize(DeviceState *dev, Error **errp)
NULL, 1, EM_S390, 0, 0);
if (kernel_size < 0) {
kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
}
if (kernel_size < 0) {
error_setg(&err, "could not load kernel '%s'", ipl->kernel);
goto error;
if (kernel_size < 0) {
error_setg(&err, "could not load kernel '%s'", ipl->kernel);
goto error;
}
/* if this is Linux use KERN_IMAGE_START */
magic = rom_ptr(LINUX_MAGIC_ADDR);
if (magic && !memcmp(magic, "S390EP", 6)) {
pentry = KERN_IMAGE_START;
} else {
/* if not Linux load the address of the (short) IPL PSW */
ipl_psw = rom_ptr(4);
if (ipl_psw) {
pentry = be32_to_cpu(*ipl_psw) & 0x7fffffffUL;
} else {
error_setg(&err, "Could not get IPL PSW");
goto error;
}
}
}
/*
* Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the