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https://github.com/yuzu-emu/unicorn.git
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exec: introduce address_space_extend_translation
This extracts the common part of address_space_map and address_space_cache_init into a new function. Backports commit 715c31ec8e12107f47ac74b464c97e813c76f898 from qemu
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parent
88ad0f4f6e
commit
03a9bbb3d3
59
qemu/exec.c
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_
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return true;
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}
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static hwaddr
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address_space_extend_translation(AddressSpace *as, hwaddr addr, hwaddr target_len,
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MemoryRegion *mr, hwaddr base, hwaddr len,
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bool is_write)
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{
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hwaddr done = 0;
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hwaddr xlat;
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MemoryRegion *this_mr;
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for (;;) {
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target_len -= len;
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addr += len;
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done += len;
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if (target_len == 0) {
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return done;
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}
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len = target_len;
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this_mr = address_space_translate(as, addr, &xlat, &len, is_write);
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if (this_mr != mr || xlat != base + done) {
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return done;
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}
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}
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}
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/* Map a physical memory region into a host virtual address.
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* May map a subset of the requested range, given by and returned in *plen.
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* May return NULL if resources needed to perform the mapping are exhausted.
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@ -2264,14 +2289,14 @@ bool address_space_access_valid(AddressSpace *as, hwaddr addr, int len, bool is_
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* likely to succeed.
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*/
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void *address_space_map(AddressSpace *as,
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hwaddr addr,
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hwaddr *plen,
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bool is_write)
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hwaddr addr,
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hwaddr *plen,
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bool is_write)
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{
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hwaddr len = *plen;
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hwaddr done = 0;
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hwaddr l, xlat, base;
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MemoryRegion *mr, *this_mr;
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hwaddr l, xlat;
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MemoryRegion *mr;
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void *ptr;
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if (len == 0) {
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return NULL;
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@ -2300,26 +2325,10 @@ void *address_space_map(AddressSpace *as,
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return as->uc->bounce.buffer;
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}
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base = xlat;
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for (;;) {
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len -= l;
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addr += l;
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done += l;
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if (len == 0) {
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break;
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}
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l = len;
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this_mr = address_space_translate(as, addr, &xlat, &l, is_write);
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if (this_mr != mr || xlat != base + done) {
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break;
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}
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}
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memory_region_ref(mr);
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*plen = done;
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return qemu_ram_ptr_length(as->uc, mr->ram_block, base, plen);
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*plen = address_space_extend_translation(as, addr, len, mr, xlat, l, is_write);
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ptr = qemu_ram_ptr_length(mr->uc, mr->ram_block, xlat, plen);
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return ptr;
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}
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/* Unmaps a memory region previously mapped by address_space_map().
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