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s390: Add mapping helper functions.

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Add s390_cpu_physical_memory_{map,unmap} with special handling
for the lowcore.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Cornelia Huck 2013-01-24 02:28:02 +00:00 committed by Alexander Graf
parent 4782a23b27
commit 38322ed651
2 changed files with 29 additions and 0 deletions
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4
target-s390x/cpu.h
View file

@ -302,6 +302,10 @@ int cpu_s390x_handle_mmu_fault (CPUS390XState *env, target_ulong address, int rw
#ifndef CONFIG_USER_ONLY
void *s390_cpu_physical_memory_map(CPUS390XState *env, hwaddr addr, hwaddr *len,
int is_write);
void s390_cpu_physical_memory_unmap(CPUS390XState *env, void *addr, hwaddr len,
int is_write);
void s390x_tod_timer(void *opaque);
void s390x_cpu_timer(void *opaque);

25
target-s390x/helper.c
View file

@ -490,6 +490,31 @@ static void cpu_unmap_lowcore(LowCore *lowcore)
cpu_physical_memory_unmap(lowcore, sizeof(LowCore), 1, sizeof(LowCore));
}
void *s390_cpu_physical_memory_map(CPUS390XState *env, hwaddr addr, hwaddr *len,
int is_write)
{
hwaddr start = addr;
/* Mind the prefix area. */
if (addr < 8192) {
/* Map the lowcore. */
start += env->psa;
*len = MIN(*len, 8192 - addr);
} else if ((addr >= env->psa) && (addr < env->psa + 8192)) {
/* Map the 0 page. */
start -= env->psa;
*len = MIN(*len, 8192 - start);
}
return cpu_physical_memory_map(start, len, is_write);
}
void s390_cpu_physical_memory_unmap(CPUS390XState *env, void *addr, hwaddr len,
int is_write)
{
cpu_physical_memory_unmap(addr, len, is_write, len);
}
static void do_svc_interrupt(CPUS390XState *env)
{
uint64_t mask, addr;