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exec: introduce address_space_extend_translation

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This extracts the common part of address_space_map and
address_space_cache_init into a new function.

Backports commit 715c31ec8e12107f47ac74b464c97e813c76f898 from qemu
This commit is contained in:
Paolo Bonzini 2018-03-01 10:04:52 -05:00 committed by Lioncash
parent 88ad0f4f6e
commit 03a9bbb3d3
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 34 additions and 25 deletions
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59
qemu/exec.c
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@ -2256,6 +2256,31 @@ bool address_space_access_valid(AddressSpace *as, hwaddr addr, int len, bool is_
return true; return true;
} }
static hwaddr
address_space_extend_translation(AddressSpace *as, hwaddr addr, hwaddr target_len,
MemoryRegion *mr, hwaddr base, hwaddr len,
bool is_write)
{
hwaddr done = 0;
hwaddr xlat;
MemoryRegion *this_mr;
for (;;) {
target_len -= len;
addr += len;
done += len;
if (target_len == 0) {
return done;
}
len = target_len;
this_mr = address_space_translate(as, addr, &xlat, &len, is_write);
if (this_mr != mr || xlat != base + done) {
return done;
}
}
}
/* Map a physical memory region into a host virtual address. /* Map a physical memory region into a host virtual address.
* May map a subset of the requested range, given by and returned in *plen. * May map a subset of the requested range, given by and returned in *plen.
* May return NULL if resources needed to perform the mapping are exhausted. * May return NULL if resources needed to perform the mapping are exhausted.
@ -2264,14 +2289,14 @@ bool address_space_access_valid(AddressSpace *as, hwaddr addr, int len, bool is_
* likely to succeed. * likely to succeed.
*/ */
void *address_space_map(AddressSpace *as, void *address_space_map(AddressSpace *as,
hwaddr addr, hwaddr addr,
hwaddr *plen, hwaddr *plen,
bool is_write) bool is_write)
{ {
hwaddr len = *plen; hwaddr len = *plen;
hwaddr done = 0; hwaddr l, xlat;
hwaddr l, xlat, base; MemoryRegion *mr;
MemoryRegion *mr, *this_mr; void *ptr;
if (len == 0) { if (len == 0) {
return NULL; return NULL;
@ -2300,26 +2325,10 @@ void *address_space_map(AddressSpace *as,
return as->uc->bounce.buffer; return as->uc->bounce.buffer;
} }
base = xlat;
for (;;) {
len -= l;
addr += l;
done += l;
if (len == 0) {
break;
}
l = len;
this_mr = address_space_translate(as, addr, &xlat, &l, is_write);
if (this_mr != mr || xlat != base + done) {
break;
}
}
memory_region_ref(mr); memory_region_ref(mr);
*plen = done; *plen = address_space_extend_translation(as, addr, len, mr, xlat, l, is_write);
return qemu_ram_ptr_length(as->uc, mr->ram_block, base, plen); ptr = qemu_ram_ptr_length(mr->uc, mr->ram_block, xlat, plen);
return ptr;
} }
/* Unmaps a memory region previously mapped by address_space_map(). /* Unmaps a memory region previously mapped by address_space_map().