+ SHIFT_AS_DIV

xrip · Jun 23, 2024 · 3b87ec4 · 3b87ec4
1 parent 818db7e
commit 3b87ec4
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Showing 2 changed files with 4 additions and 1 deletion.
diff --git a/src/ram_page.c b/src/ram_page.c
@@ -89,7 +89,7 @@ static uint16_t last_ram_page = 0;
 static uint32_t last_lba_page = 0;
 
 uint32_t get_ram_page_for(const uint32_t addr32) {
-    const register uint32_t lba_page = addr32 / RAM_PAGE_SIZE; // 4KB page idx
+    const register uint32_t lba_page = addr32 >> SHIFT_AS_DIV; // page idx
     if (last_lba_page == lba_page) {
         return last_ram_page;
     }

diff --git a/src/ram_page.h b/src/ram_page.h
@@ -15,16 +15,19 @@
 #ifdef SWAP_BLOCK_1k
 #define RAM_PAGE_SIZE_KB 1ul
 #define RAM_IN_PAGE_ADDR_MASK (0x000003FF)
+#define SHIFT_AS_DIV 10
 #endif
 // --- select only one of 'em
 #ifdef SWAP_BLOCK_2k
 #define RAM_PAGE_SIZE_KB 2ul
 #define RAM_IN_PAGE_ADDR_MASK (0x000007FF)
+#define SHIFT_AS_DIV 11
 #endif
 // --- select only one of 'em
 #ifdef SWAP_BLOCK_4k
 #define RAM_PAGE_SIZE_KB 4ul
 #define RAM_IN_PAGE_ADDR_MASK (0x00000FFF)
+#define SHIFT_AS_DIV 12
 #endif
 // --- select only one of 'em ^