memory: remove first level of l1_phys_map
L1 and the lower levels in l1_phys_map are equivalent, except that L1 has
a different size, and is always allocated. Simplify the code by removing
L1. This leaves us with a tree composed solely of L2 tables, but that
problem can be renamed away later.
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/exec.c b/exec.c
index b36c301..c541ee7 100644
--- a/exec.c
+++ b/exec.c
@@ -160,29 +160,21 @@
#define L2_BITS 10
#define L2_SIZE (1 << L2_BITS)
+#define P_L2_LEVELS \
+ (((TARGET_PHYS_ADDR_SPACE_BITS - TARGET_PAGE_BITS - 1) / L2_BITS) + 1)
+
/* The bits remaining after N lower levels of page tables. */
-#define P_L1_BITS_REM \
- ((TARGET_PHYS_ADDR_SPACE_BITS - TARGET_PAGE_BITS) % L2_BITS)
#define V_L1_BITS_REM \
((L1_MAP_ADDR_SPACE_BITS - TARGET_PAGE_BITS) % L2_BITS)
-/* Size of the L1 page table. Avoid silly small sizes. */
-#if P_L1_BITS_REM < 4
-#define P_L1_BITS (P_L1_BITS_REM + L2_BITS)
-#else
-#define P_L1_BITS P_L1_BITS_REM
-#endif
-
#if V_L1_BITS_REM < 4
#define V_L1_BITS (V_L1_BITS_REM + L2_BITS)
#else
#define V_L1_BITS V_L1_BITS_REM
#endif
-#define P_L1_SIZE ((target_phys_addr_t)1 << P_L1_BITS)
#define V_L1_SIZE ((target_ulong)1 << V_L1_BITS)
-#define P_L1_SHIFT (TARGET_PHYS_ADDR_SPACE_BITS - TARGET_PAGE_BITS - P_L1_BITS)
#define V_L1_SHIFT (L1_MAP_ADDR_SPACE_BITS - TARGET_PAGE_BITS - V_L1_BITS)
unsigned long qemu_real_host_page_size;
@@ -202,7 +194,7 @@
/* This is a multi-level map on the physical address space.
The bottom level has pointers to PhysPageDesc. */
-static void *l1_phys_map[P_L1_SIZE];
+static void *phys_map;
static void io_mem_init(void);
static void memory_map_init(void);
@@ -404,11 +396,10 @@
void **lp;
int i;
- /* Level 1. Always allocated. */
- lp = l1_phys_map + ((index >> P_L1_SHIFT) & (P_L1_SIZE - 1));
+ lp = &phys_map;
- /* Level 2..N-1. */
- for (i = P_L1_SHIFT / L2_BITS - 1; i > 0; i--) {
+ /* Level 1..N-1. */
+ for (i = P_L2_LEVELS - 1; i > 0; i--) {
void **p = *lp;
if (p == NULL) {
if (!alloc) {
@@ -2560,11 +2551,7 @@
static void destroy_all_mappings(void)
{
- unsigned i;
-
- for (i = 0; i < P_L1_SIZE; ++i) {
- destroy_l2_mapping(&l1_phys_map[i], P_L1_SHIFT / L2_BITS - 1);
- }
+ destroy_l2_mapping(&phys_map, P_L2_LEVELS - 1);
}
/* register physical memory.
