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memory: Export a helper to get intersection of a MemoryRegionSection with a given range

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Rename the helper to memory_region_section_intersect_range() to make it
more generic. Meanwhile, define the @end as Int128 and replace the
related operations with Int128_* format since the helper is exported as
a wider API.

Suggested-by: Alexey Kardashevskiy <aik@amd.com>
Reviewed-by: Alexey Kardashevskiy <aik@amd.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Link: https://lore.kernel.org/r/20250612082747.51539-2-chenyi.qiang@intel.com
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Chenyi Qiang 2025-06-12 16:27:42 +08:00 • committed by Peter Xu
parent 983899eab4
commit f47a672a72
2 changed files with 35 additions and 27 deletions
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30
include/system/memory.h
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@ -1211,6 +1211,36 @@ MemoryRegionSection *memory_region_section_new_copy(MemoryRegionSection *s);
*/
void memory_region_section_free_copy(MemoryRegionSection *s);
/**
* memory_region_section_intersect_range: Adjust the memory section to cover
* the intersection with the given range.
*
* @s: the #MemoryRegionSection to be adjusted
* @offset: the offset of the given range in the memory region
* @size: the size of the given range
*
* Returns false if the intersection is empty, otherwise returns true.
*/
static inline bool memory_region_section_intersect_range(MemoryRegionSection *s,
uint64_t offset,
uint64_t size)
{
uint64_t start = MAX(s->offset_within_region, offset);
Int128 end = int128_min(int128_add(int128_make64(s->offset_within_region),
s->size),
int128_add(int128_make64(offset),
int128_make64(size)));
if (int128_le(end, int128_make64(start))) {
return false;
}
s->offset_within_address_space += start - s->offset_within_region;
s->offset_within_region = start;
s->size = int128_sub(end, int128_make64(start));
return true;
}
/**
* memory_region_init: Initialize a memory region
*