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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>
master
Avi Kivity 2012-02-10 14:57:31 +02:00
parent 54688b1ec1
commit 3eef53df6b
1 changed files with 8 additions and 21 deletions
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29
exec.c
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@ -160,29 +160,21 @@ typedef struct PageDesc {
#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 @@ typedef struct PhysPageDesc {
/* 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 @@ static PhysPageDesc *phys_page_find_alloc(target_phys_addr_t index, int alloc)
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_l2_mapping(void **lp, unsigned level)
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.