softmmu: Create qemu_target_pages_to_MiB()

Function that convert a number of target_pages into its size in MiB.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20230511141208.17779-2-quintela@redhat.com>

diff --git a/include/exec/target_page.h b/include/exec/target_page.h
index 96726c36a416379ecbaf7855479f1a7393063cb2..bbf37aea177879981e2458d7e00ee3a5a3f46e46 100644 (file)
--- a/include/exec/target_page.h
+++ b/include/exec/target_page.h
@@ -18,4 +18,5 @@ size_t qemu_target_page_size(void);
 int qemu_target_page_bits(void);
 int qemu_target_page_bits_min(void);
 
+size_t qemu_target_pages_to_MiB(size_t pages);
 #endif

diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index 0e0182d9f2a47dc7872ccdb4831839bb0e874859..efaed36773c1689417b67e6e329b3c9f5c18c9c0 100644 (file)
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -3357,6 +3357,17 @@ int qemu_target_page_bits_min(void)
     return TARGET_PAGE_BITS_MIN;
 }
 
+/* Convert target pages to MiB (2**20). */
+size_t qemu_target_pages_to_MiB(size_t pages)
+{
+    int page_bits = TARGET_PAGE_BITS;
+
+    /* So far, the largest (non-huge) page size is 64k, i.e. 16 bits. */
+    g_assert(page_bits < 20);
+
+    return pages >> (20 - page_bits);
+}
+
 bool cpu_physical_memory_is_io(hwaddr phys_addr)
 {
     MemoryRegion*mr;